CN112426141A

CN112426141A - Blood pressure detection method and device and electronic equipment

Info

Publication number: CN112426141A
Application number: CN202011432872.7A
Authority: CN
Inventors: 李华飞
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-03-02
Anticipated expiration: 2040-12-09
Also published as: CN112426141B

Abstract

The blood pressure detection method, the blood pressure detection device and the electronic equipment have the advantages of relatively accurate blood pressure detection result and convenience in detection. The blood pressure detection method is applied to a blood pressure detection device, and comprises the following steps: acquiring blood pressure calibration information, wherein the blood pressure calibration information is obtained by processing a first PPG signal according to a first pressure acting on a user and the first pressure acting on the user; acquiring a second PPG signal, and processing according to the second PPG signal to obtain the initial blood pressure of the user; and calibrating the initial blood pressure according to the blood pressure calibration information, and taking the blood pressure obtained by calibration as the blood pressure of the user. In the technical scheme, the blood pressure calibration information determined according to the first PPG signal and the first pressure is directly obtained according to the blood pressure detection device without the assistance of external equipment such as a sphygmomanometer and the like, the initial blood pressure determined according to the second PPG signal is obtained, the initial blood pressure is calibrated according to the blood pressure calibration information, and the accurate blood pressure of the user can be obtained.

Description

Blood pressure detection method and device and electronic equipment

Technical Field

The present application relates to the field of electronic technologies, and in particular, to a blood pressure detection method and apparatus, and an electronic device.

Background

Blood pressure is one of important parameters for measuring the cardiovascular system of a human body, and has important significance in disease diagnosis, treatment process and prognosis judgment. Currently, the mature blood pressure detection method in the market is a cuff type detection method based on an auscultatory method or an oscillometric method, wherein the auscultatory method requires a professional operator to judge the blood pressure based on the sound of the blood flow of the brachial artery, and is suitable for a medical scene; the oscillography is to inflate the cuff to block the arterial blood flow, then detect the gas pressure in the cuff during the exhaust process and extract the weak pulse wave, and detect the blood pressure value according to the change of the pulse wave along with the pressure in the cuff.

With the development of living standards, the sphygmomanometer adopting the cuff type detection method gradually enters more daily scenes, the accuracy of blood pressure measurement and the portability of the sphygmomanometer are very important for hypertensive patients, and although the sphygmomanometer adopting the cuff type detection method is accurate in blood pressure measurement, the sphygmomanometer is not easy to carry and cannot meet the requirements of all-weather blood pressure monitoring and the hypertensive patients.

Therefore, the blood pressure detection device which has accurate blood pressure detection results, can be carried conveniently is provided, and has great application prospect and market value.

Disclosure of Invention

The embodiment of the application provides a blood pressure detection method, a blood pressure detection device and electronic equipment, which have relatively accurate blood pressure detection results and are convenient and fast to detect.

In a first aspect, a blood pressure detecting method is applied to a blood pressure detecting device, and includes:

acquiring blood pressure calibration information, wherein the blood pressure calibration information is obtained by processing a first photoplethysmography (PPG) signal according to a first pressure acting on a user and the first pressure acting on the user;

acquiring a second photoplethysmography (PPG) signal, and processing the second PPG signal to obtain the initial blood pressure of the user;

and calibrating the initial blood pressure according to the blood pressure calibration information, and taking the blood pressure obtained by calibration as the blood pressure of the user.

In the technical scheme of the embodiment of the application, when the second PPG signal is detected, the accuracy of the blood pressure measured based on the second PPG signal is low. At this time, the blood pressure calibration information determined according to the first PPG signal and the first pressure is directly obtained according to the blood pressure detection device without the assistance of external equipment such as a sphygmomanometer, and the blood pressure calibration information is provided for the initial blood pressure determined according to the second PPG signal, the initial blood pressure is calibrated by the blood pressure calibration information, and the more accurate blood pressure obtained by calibration is used as the blood pressure of the user. In addition, if only rely on first PPG signal and first pressure to confirm the blood pressure value, need all have first pressure to act on the user when detecting blood pressure at every turn, complex operation just causes not good experience to the user. In the embodiment of the application, the blood pressure calibration information obtained by processing before can be acquired to calibrate the current initial blood pressure obtained according to the second PPG signal, so that the first pressure does not need to act on the user when the blood pressure is detected every time, and the first pressure and the first PPG signal are detected, thereby further improving the accuracy of the blood pressure detection, improving the convenience of the blood pressure detection and improving the user experience.

In some possible embodiments, the obtaining blood pressure calibration information includes: driving a pressure application module to apply pressure to the user to form the first pressure; controlling a first pulse wave detection module to detect the first PPG signal when the first pressure acts on the user; the control pressure detection module detects the first pressure; the first pressure and the first PPG signal are received, and the blood pressure calibration information is determined from the first pressure and the first PPG signal.

In some possible embodiments, the obtaining blood pressure calibration information includes: controlling a prompting module to output a prompting signal, wherein the prompting signal is used for prompting the user to apply pressure to the blood pressure detection device so as to form the first pressure; controlling a first pulse wave detection module to detect the first PPG signal when the first pressure acts on the user; the control pressure detection module detects the first pressure; the first pressure and the first PPG signal are received, and the blood pressure calibration information is determined from the first pressure and the first PPG signal.

In some possible embodiments, the first pressure is varied from large to small or from small to large with time.

In some possible embodiments, the acquiring a second photoplethysmography, PPG, signal and processing from the second PPG signal to derive the initial blood pressure of the user includes: controlling a second pulse wave detection module to detect the second PPG signal of the user; and receiving the second PPG signal, and processing the second PPG signal by adopting a pulse wave analysis method or a pulse wave transit time measurement method to obtain the initial blood pressure of the user.

In some possible embodiments, the first pressure varies over time, the determining the blood pressure calibration information from the first pressure and the first PPG signal, comprises: sequencing the first PPG signal corresponding to the first pressure according to the magnitude of the first pressure to form an envelope signal of the first PPG signal; determining a first blood pressure of the user from the envelope signal; and taking the first blood pressure as the blood pressure calibration information.

In some possible embodiments, the calibrating the initial blood pressure according to the blood pressure calibration information, and taking the calibrated blood pressure as the blood pressure of the user includes: taking the blood pressure calibration information as a direct current component of the blood pressure of the user, and taking the initial blood pressure as an alternating current component of the blood pressure of the user; and calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and taking the blood pressure obtained by calibration as the blood pressure of the user.

In some possible embodiments, before the acquiring the second photoplethysmography PPG signal, the blood pressure detection method further comprises: determining whether the user is in motion; if not, acquiring the second PPG signal; if yes, after a preset time period, whether the user is in the motion state is determined again.

In some possible embodiments, the acquiring a first photoplethysmography, PPG, signal comprises: acquiring the first PPG signal at a first part of the user; this acquire second photoplethysmography PPG signal includes: acquiring the second PPG signal at a second part of the user, wherein the second part is different from the first part.

In some possible embodiments, the first portion is a finger of the user and the second portion is a wrist of the user.

In a second aspect, a blood pressure detection apparatus is provided, comprising a processor configured to: acquiring blood pressure calibration information, wherein the blood pressure calibration information is obtained by processing a first photoplethysmography (PPG) signal according to a first pressure acting on a user and the first pressure acting on the user; acquiring a second photoplethysmography (PPG) signal, and processing the second PPG signal to obtain the initial blood pressure of the user; and calibrating the initial blood pressure according to the blood pressure calibration information, and taking the blood pressure obtained by calibration as the blood pressure of the user.

In some possible embodiments, the processor is configured to: driving a pressure applying module to apply the first pressure to the user to form the first pressure; controlling a first pulse wave detection module to detect the first PPG signal when the first pressure acts on the user; the control pressure detection module detects the first pressure; the first pressure and the first PPG signal are received, and the blood pressure calibration information is determined from the first pressure and the first PPG signal.

In some possible embodiments, the blood pressure detection device further comprises: the pressure applying module is electrically connected with the processor and the first pulse wave detecting module is electrically connected with the processor.

In some possible embodiments, the processor is configured to: controlling a prompting module to output a prompting signal, wherein the prompting signal is used for prompting the user to apply pressure to the blood pressure detection device so as to form the first pressure; controlling a first pulse wave detection module to detect the first PPG signal when the first pressure acts on the user; the control pressure detection module detects the first pressure; the first pressure and the first PPG signal are received, and the blood pressure calibration information is determined from the first pressure and the first PPG signal.

In some possible embodiments, the blood pressure detection device further comprises: the prompting module is electrically connected with the processor, and the first pulse wave detection module is electrically connected with the processor.

In some possible embodiments, the processor is configured to: controlling a second pulse wave detection module to detect the second PPG signal of the user; and receiving the second PPG signal, and processing the second PPG signal by adopting a pulse wave analysis method or a pulse wave transit time measurement method to obtain the initial blood pressure of the user.

In some possible embodiments, the blood pressure detection device further comprises: the second pulse wave detection module is electrically connected with the processor.

In some possible embodiments, the first PPG signal varies with the magnitude of the first pressure; the processor is configured to: sequencing the first PPG signal according to the magnitude of the first pressure to form an envelope signal of the first PPG signal; determining a first blood pressure of the user from the envelope signal; and taking the first blood pressure as the blood pressure calibration information.

In some possible embodiments, the processor is configured to: taking the blood pressure calibration information as a direct current component of the blood pressure of the user, and taking the initial blood pressure as an alternating current component of the blood pressure of the user; and calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and taking the blood pressure obtained by calibration as the blood pressure of the user.

In some possible embodiments, before the processor is configured to acquire the second photoplethysmography PPG signal, the processor is further configured to: determining whether the user is in motion; if not, acquiring the second PPG signal; if yes, after a preset time period, whether the user is in the motion state is determined again.

In some possible embodiments, the processor is configured to: acquiring the first PPG signal at a first part of the user; acquiring the second PPG signal at a second part of the user, wherein the second part is different from the first part.

In a third aspect, an electronic device is provided, including: the blood pressure detection device according to the second aspect or any one of the possible embodiments of the second aspect.

In some possible embodiments, the electronic device is a smart watch.

Drawings

Fig. 1 is a block diagram of an electronic device to which the biological information detection system is applied.

Fig. 2 is a schematic structural diagram of a device for acquiring photoplethysmography by using a photoelectric sensor.

Fig. 3 is a waveform characteristic diagram of a pulse wave.

Fig. 4 is a schematic diagram of the relative relationship between ECG waveforms, PPG waveforms, and PTT.

Fig. 5 is a schematic flow chart diagram of a blood pressure detection method according to an embodiment of the present application.

Fig. 6 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a cue signal according to an embodiment of the present application.

Fig. 8 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.

Fig. 9 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.

Fig. 10 is a waveform diagram of a first PPG signal as a function of a first pressure according to an embodiment of the present application.

Fig. 11 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.

Fig. 12 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.

Fig. 13 is a schematic structural block diagram of a blood pressure detection device according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of another blood pressure detecting device according to an embodiment of the present application.

Fig. 15 is a top view of a smart watch according to an embodiment of the present application.

Fig. 16 is a bottom view of the smart watch of fig. 15.

Fig. 17 is a side view of the smart watch of fig. 15.

Fig. 18 is a schematic block diagram of another blood pressure detection device according to an embodiment of the present application.

Fig. 19 is a bottom view of another smart watch according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be understood that the specific examples are provided herein only to assist those skilled in the art in better understanding the embodiments of the present application and are not intended to limit the scope of the embodiments of the present application.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic of the processes, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It should also be understood that the various embodiments described in this specification can be implemented individually or in combination, and the examples in this application are not limited thereto.

Unless otherwise defined, all technical and scientific terms used in the examples of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present application is applicable to a biological information detection system, including but not limited to a blood pressure detection system. The biological information detection system can be applied to various types of electronic devices, such as smart wearable devices, mobile phones, tablet computers, mobile medical devices and the like, wherein the smart wearable devices can comprise at least one of the following devices: a watch, bracelet, foot chain, necklace, glasses, or head-mounted device; the ambulatory medical device may include at least one of the following devices: blood glucose monitoring equipment, heart rate monitoring equipment, blood pressure measuring equipment, body temperature measuring equipment and the like, and the embodiment of the application does not limit the equipment.

Fig. 1 is a block diagram showing a configuration of an electronic device to which the biological information detection system is applied.

As shown in fig. 1, electronic device 10 may include a bus 110, a processor 120, a memory 130, an input/output interface 140, a display 150, a communication interface 160, and a biological information detection system 170.

Bus 110 may include circuitry to enable communications (e.g., control messages or data) to be transmitted between components within electronic device 10. The processor 120 may include one or more types of data processors for performing data processing. The memory 130 may include volatile memory and/or non-volatile memory. Which may store instructions or data related to other functional components in electronic device 10.

The input/output interface 140 may be used to receive commands or data input from a user or an external device and then transmit the commands or data to other functional components in the electronic device 10, or may output commands or data generated by other functional components in the electronic device 10 to a user or an external device.

The Display 150 may include, for example, a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED) Display, or other type of Display. Display 150 may display various types of content for a user, such as text, images, videos, icons, and so forth. Further, the display 150 may include a touch screen through which a user may input related instruction information.

Communication interface 160 may be used to enable communications between electronic device 10 and external devices, such as a network server or other electronic devices. By way of example, the communication interface 160 may communicate with external devices by connecting to a communication network via wireless or wired communication. Wireless communication includes, but is not limited to, cellular communication or short-range communication. The wired communication includes, but is not limited to, at least one of Universal Serial Bus (USB), High Definition Multimedia Interface (HDMI), recommended standard 232 (RS-232), or other communication methods.

The biometric information detection system 170 is used to enable detection of biometric information of a user, including but not limited to: the heart rate, the blood oxygen saturation, the blood pressure and other parameter information of the user can be obtained by testing the pulse wave of the user, in other words, the biological information detecting system 170 in the embodiment of the present application can be used to detect the pulse wave of the user, and obtain one or more kinds of biological characteristic information of the user based on the calculation and analysis of the pulse wave.

In some embodiments, electronic device 10 may omit at least one of the above components, or may further include other components, which are not described in detail herein.

Specifically, the embodiment of the present application relates to a blood pressure detection method and a blood pressure detection apparatus, which can be applied to the biological information detection system 170 in fig. 1 and provided in the electronic device 10 in fig. 1. More particularly, the present invention relates to a cuff-less blood pressure detection method and a blood pressure detection apparatus based on pulse waves, which are portable, can perform continuous non-invasive measurement, and have high measurement accuracy.

For ease of understanding, the related concepts to which this application relates will first be described.

(1) Pulse wave

The pulse wave refers to the periodic fluctuation of the artery wall caused by the periodic changes of the pressure and the volume in the artery in the periodic contraction and relaxation process of the heart, namely the periodic pulsation of the heart pushes the blood to move along the blood vessel to generate the pulse wave. Therefore, the pulse wave is influenced by the functional state of the heart, the resistance of the blood vessels in the arteries passing through the various levels, the elasticity of the blood vessels, the viscosity of the blood, and the like, and the change in the physiological characteristics of the cardiovascular system causes the change in the intensity, form, rhythm and rate of the pulse wave signal. Therefore, the physiological and pathological information contained in the pulse wave signals can be extracted by analyzing and researching the characteristics of the pulse wave signals, and the early diagnosis and prevention of the diseases related to the cardiovascular system are facilitated.

The pulse wave is divided into a pressure pulse wave and a photoplethysmographic pulse wave, which respectively reflect the pressure in the blood vessel and the periodic change of the volume. The pressure pulse wave is usually detected and acquired at a superficial artery such as a radial artery, a carotid artery or a femoral artery, and a pressure pulse wave oscillogram is obtained by tracing a change curve of arterial pressure along with time by using a pressure sensor.

The photoplethysmography is generally obtained by using a photoelectric sensor, so the photoplethysmography is also commonly referred to as a photoplethysmography (PPG), a time-varying curve of a blood volume obtained by the photoplethysmography is a photoplethysmogram, and hereinafter, the photoplethysmography is also referred to as a photoplethysmography signal or a PPG signal.

In particular, fig. 2 shows a schematic structural diagram of a device for acquiring photoplethysmography by using a photoelectric sensor.

As shown in fig. 2, when a light source emits a light beam with a certain wavelength to the surface of human skin (e.g., the skin of a finger as shown in fig. 2), each heartbeat, the contraction and expansion of blood vessels affects the transmission of light (e.g., light passing through the fingertip in a transmission PPG) or the reflection of light (e.g., light from the vicinity of the surface of the finger in a reflection PPG). There is some attenuation of the light as it passes through the skin tissue and reflects back to the light detector. The absorption of light by the tissues like muscles, bones, veins and other connections is substantially constant (if there is no substantial movement of the measurement site), but the arteries will be different and naturally also vary due to the pulsation of the blood in the arteries. Therefore, after the optical detector converts the optical signal reflected and/or transmitted by the human body into an electrical signal, the absorption of the optical signal by the artery is changed, and the absorption of the optical signal by other tissues is basically unchanged, so that the obtained signal can be divided into a direct current DC signal and an alternating current AC signal, and the AC signal is extracted from the direct current DC signal and the alternating current AC signal, so that the characteristic of blood flow can be reflected.

The two pulse wave oscillograms have similar morphological characteristics, because the pressure pulse wave and the photoplethysmography are actually two different expression forms of the periodic beating process of the same artery, and essentially reflect the functional state of the cardiovascular system.

Fig. 3 shows a waveform characteristic diagram of a photoplethysmographic wave.

As shown in FIG. 3, a complete pulse waveform has A, B, C, D4 important feature points, which include ascending branches and descending branches. As shown in FIG. 3, A is called the dominant wave, B is called the tidal wave, C is called the dicrotic wave peak, D is called the dicrotic wave trough, OA is the ascending branch of the dominant wave, and OO' is the pulse wave period.

The OA segment is the ascending branch of pulse waveform, and the arterial blood pressure is rapidly increased due to the contraction and ejection of blood from the left ventricle, so that the arterial wall is expanded. Point O is the starting point of the cardiac ejection phase and point a is the highest point of aortic pressure, reflecting the maximum of pressure and volume in the artery.

The AD section is the front section of the descending branch of the pulse waveform, and is caused by the process that the blood ejection speed begins to decrease at the later stage of ventricular ejection, the blood volume flowing to the periphery of the aorta is larger than the blood volume flowing into the aorta, the artery is changed from expansion to retraction, and the arterial blood pressure gradually becomes lower. Point B is the left ventricular ejection stop point, the peak point of the reflected wave, also called the tidal wave peak, reflecting the tension, compliance and peripheral resistance of the arterial vessel. Point D is the tidal wave trough point, the demarcation point between systole and diastole.

The DO' section is the posterior section of the descending branch of the pulse waveform, also called the dicrotic wave, and is formed by the blood in the aorta flowing backwards towards the ventricle due to the ventricular diastole, the continuous reduction of the arterial blood pressure. Reflecting the functional status of the aorta, the elasticity of the vessels and the state of blood flow.

(2) Pulse Transit Time (PTT) and Pulse Wave Velocity (PWV) measurements

Specifically, PTT refers to the time of transmission of a pulse wave from the heart to the measurement site when an artery emits blood, and PWV can be calculated by PTT by the positional relationship between the measurement site and the heart. In the existing technical theory, PWV and blood pressure have a linear relation, and the blood pressure can be calculated according to PWV or PTT and related data models.

At present, because the pulse wave velocity PWV is difficult to be detected, the existing blood pressure detection methods based on PWV all rely on PTT detection.

In some methods, the blood pressure may be estimated by detecting PTT through a blood pressure detection technique combining Electrocardiography (ECG) with PPG.

Fig. 4 shows the relative relationship between ECG, PPG, and PTT.

As shown in fig. 4, in an ECG waveform, the R-wave represents the contraction of the ventricles, and the time interval between the R-wave in the ECG waveform to the main wave in the PPG waveform, can be denoted as PPT. Alternatively, the PPT may be represented by the time interval before the R-wave in the ECG waveform reaches other characteristic points in the PPG waveform.

Specifically, the method detects and obtains the Blood Pressure as the high-frequency component of the Systolic Blood Pressure (SBP) according to the PTT and the function equation, while the low-frequency component of the Systolic Blood Pressure needs to be measured by a more accurate Blood Pressure measuring method, such as an auscultatory method or an oscillometric method, and the final more accurate Systolic Blood Pressure value can be determined according to the sum of the low-frequency component and the high-frequency component of the Systolic Blood Pressure. Further, according to a function equation among the PTT, the more accurate Systolic Blood Pressure (SBP), and the Diastolic Blood Pressure (DPB), the more accurate value of the Diastolic DPB may be obtained. In other words, the method needs to measure the accurate low-frequency component of blood pressure regularly by an external device such as a sphygmomanometer, and calibrate the blood pressure detected by the PPT detection method, so as to obtain a more accurate blood pressure detection result.

(3) Pulse Wave Analysis (PWA)

Specifically, the characteristic parameters in the pulse wave can be extracted, the characteristic parameters with the best correlation with the blood pressure can be found by analyzing the correlation between the characteristic parameters and the blood pressure, the characteristic parameters are used as variables for measuring the blood pressure, then regression analysis is carried out, and a regression function equation is established for measuring the blood pressure.

Alternatively, the amplitude of any feature point in the pulse wave shown in fig. 3 or the time difference between any two feature points may be used as a feature parameter, and correlation analysis is performed on the feature parameter and the blood pressure through a large amount of experimental data, and a regression function equation is established. In the actual blood pressure measuring process, the blood pressure is measured according to the characteristic parameters and the regression function equation by detecting the pulse wave and extracting the characteristic parameters from the pulse wave.

The blood pressure detected by the method is obtained by calculation through a regression function equation, parameters obtained by fitting people in the regression function equation change along with time and human body difference, and certain errors may exist in the blood pressure measurement result obtained by calculation through the regression function equation. Therefore, the method also needs to periodically calibrate the blood pressure measurement result, that is, the accurate blood pressure needs to be obtained periodically through external equipment such as a sphygmomanometer, and the blood pressure detected by the PWA detection method or the parameters in the regression equation are calibrated, so that a more accurate blood pressure detection result is obtained. Therefore, as is clear from the above description, the blood pressure detection device can be carried around, although pulse waves can be obtained by the cuff-less blood pressure detection method, and blood pressure can be obtained by detecting the pulse waves. However, the cuff-less blood pressure detection methods also have problems of inaccurate blood pressure measurement and troublesome calibration.

Based on this, the application provides a sleeveless blood pressure detection method and device, have convenient, can be in succession and not have advantages such as wound measurement and measurement accuracy height.

Fig. 5 shows a schematic flow chart of a blood pressure detection method 100 proposed by the present application. The blood pressure detecting method 100 is applied to a blood pressure detecting device, which may be the blood pressure detecting device for detecting blood pressure information in the biological information detecting system 170 of fig. 1, and optionally includes a processor, which may be an executing body of the blood pressure detecting method 100 described below.

As shown in fig. 5, the blood pressure detecting method 100 includes the following steps.

S110: obtaining blood pressure calibration information, wherein the blood pressure calibration information is obtained by processing according to a first pressure acting on a user and a first photoplethysmography (PPG) signal when the first pressure acts on the user.

S120: and acquiring a second photoplethysmography (PPG) signal, and processing the second PPG signal to obtain the initial blood pressure of the user.

S130: and calibrating the initial blood pressure according to the blood pressure calibration information, and taking the blood pressure obtained by calibration as the blood pressure of the user.

Specifically, in step S110, the processor acquires a first pressure that can act on the user at the current time and a first photoplethysmography (PPG) signal when the first pressure acts on the user, and the processor processes the first pressure and the first PPG signal to obtain blood pressure calibration information; alternatively, the processor directly invokes the blood pressure calibration information obtained at the previous time.

When the first pressure acts on the user, the blood vessels of the pressed part deform, the blood volume in the blood vessels changes, therefore, the first PPG signal changes along with the change of the first pressure, and therefore, the blood pressure calibration information can be determined according to the relation of the first PPG signal changing along with the first pressure.

In step S120, when no pressure acts on the user, the processor may acquire a second PPG signal of the user, and process the second PPG signal to obtain an initial blood pressure. The detection of the second PPG signal does not affect the user, can be obtained continuously for a long time and is a non-invasive detection. However, since the second PPG signal does not include information of pressure changes, the accuracy of the initial blood pressure obtained by processing the second PPG signal is low, and if the initial blood pressure is directly provided to the user, the user experience is affected.

In step S130, the initial blood pressure is calibrated based on the blood pressure calibration information, a relatively accurate blood pressure after calibration can be obtained, and the blood pressure obtained by the calibration is fed back to the user as the current blood pressure of the user.

In the technical scheme of the embodiment of the application, the obtained second PPG signal is a PPG signal obtained by detection when no pressure acts on the body surface of the user, and the accuracy of the initial blood pressure obtained based on the second PPG signal is lower. At this moment, external auxiliary equipment such as a sphygmomanometer is not needed for calibration, the first PPG signal and the first pressure are directly obtained according to the measurement of the blood pressure detection device, the blood pressure calibration information is determined and provided for the initial blood pressure, the initial blood pressure is calibrated by using the blood pressure calibration information, the calibrated accurate blood pressure is obtained and is fed back to the user as the current blood pressure of the user, therefore, the blood pressure detection method provided by the embodiment of the application does not need to additionally adopt the assistance of other devices, the operation is convenient and fast, and the accurate blood pressure detection result can be obtained. In addition, if only rely on first PPG signal and first pressure to confirm the blood pressure value, then need all have first pressure to act on the user when detecting blood pressure at every turn, complex operation just causes not good experience to the user. In the embodiment of the application, the blood pressure calibration information obtained by processing before can be acquired to calibrate the current initial blood pressure obtained according to the second PPG signal, so that the first pressure does not need to act on the user when the blood pressure is detected every time, and the first pressure and the first PPG signal are detected, thereby further improving the accuracy of the blood pressure detection, improving the convenience of the blood pressure detection and improving the user experience.

Alternatively, in step S110, a first PPG signal at a first part of the user may be acquired, and in step S120, a second PPG signal at a second part of the user may be acquired.

As will be understood from the above description relating to fig. 2, the blood pressure detection apparatus or the electronic device thereof includes a PPG detection module, which includes a light source and a light detector for detecting the first PPG signal and the second PPG signal.

In some embodiments, the first and second locations are different locations of the user, in which case the blood pressure detection apparatus or the electronic device in which it is located comprises a light source and a light detector corresponding to the two different locations, i.e. corresponding to the first light source and the first light detector at the first location of the user, for detecting the first PPG signal at the first location; corresponding to a second light source and a second light detector at a second part of the user for detecting a second PPG signal at the second part.

As an example, the first part of the user may be a finger of the user, e.g. an index finger, and the first light source and the first light detector may be controlled to detect the first PPG signal at the finger. The second part of the user may be a wrist of the user, and the second light source and the second light detector may be controlled to detect a second PPG signal at the wrist. In this case, the blood pressure detection device according to the embodiment of the present application may be disposed in a smart watch, the first light source and the first photodetector may be correspondingly disposed on a side surface of the smart watch, so that a user can use a finger to press the smart watch to detect the first pressure and the first PPG signal to obtain blood pressure calibration information, and the second light source and the second photodetector may be correspondingly disposed on a back surface of the smart watch to detect the second PPG signal at a wrist, so that the user can perform blood pressure detection conveniently. For example, the second light source and the second light detector on the back side may facilitate long-term blood pressure detection of the user (i.e., without requiring the user to press the watch for a long period of time) to monitor the user's blood pressure for a long period of time, such as for blood pressure detection and monitoring that may be conveniently and continuously performed for a long period of time while the user is asleep. And then the blood pressure calibration information obtained by the finger through the first pressure and the first PPG signal is used for calibrating the blood pressure obtained by the second PPG signal at the wrist, so that convenient blood pressure detection can be realized, and the result of the blood pressure detection is accurate.

Of course, the first part and the second part may also be the same part of the user, for example, the first part and the second part are both the wrist of the user or both other parts of the user, in this case, the blood pressure detection device or the electronic device where the blood pressure detection device is located may only include the light source and the light detector corresponding to one part, that is, the electronic device may only include one light source and one light detector, and are configured to detect the first PPG signal when the first pressure acts on the user and the second PPG signal when no pressure acts on the user at different times, respectively, and if the blood pressure detection device is disposed in the smart watch, the one light source and the one light detector may be disposed on the back of the smart watch correspondingly.

Preferably, however, the first location and the second location are different locations of the user, respectively, for the following reasons:

firstly, the blood pressure of the user is determined by testing the PPG signals of different parts of the user and integrating the PPG signals of different parts, so that the accuracy of the blood pressure test can be improved.

Secondly, if the first part is a finger and the second part is a wrist, the movement amplitude of the wrist relative to the finger is small; and the wrist is suitable for wearing intelligent terminal equipment, for example wearing of intelligent wrist-watch, and second PPG signal comes from wrist department, makes wearing equipment more suitable for carrying out long-term continuity's blood pressure detection, and then can improve user's experience.

Furthermore, the first part needs to be pressurized, the finger is convenient to pressurize, the skin of the finger is thinner than that of the wrist, when the pressure signal acts on the finger, the first PPG signal generated by the finger changes obviously along with the first pressure, accurate blood pressure calibration information can be detected, the blood pressure calibration information is provided for the second PPG signal generated by the wrist, and the accuracy of the blood pressure tested by the wrist can be improved.

Alternatively, the first pressure may act on the user in a number of different ways.

For example, in the first embodiment, the first pressure is a pressure signal generated by the user, and may be, as an example, a pressure signal generated by applying pressure to the blood pressure detection device from a first part of the user, for example, if the user applies pressure to the blood pressure detection device with a hand, the blood pressure detection device correspondingly applies a reaction force to the finger of the user to form the first pressure.

For another example, in the second embodiment, the first pressure is a pressure signal generated by the blood pressure detection device, and may be, for example, a pressure signal generated by the blood pressure detection device pressing on the first part of the user, for example, a pressure signal applied by the blood pressure detection device itself to a finger of the user.

Next, the execution procedure of the blood pressure detection method according to the above two embodiments will be described with reference to fig. 6 to 8.

Fig. 6 shows a schematic flow chart of the blood pressure detecting method 100 in the first embodiment.

As shown in fig. 6, the above step S110 may include the following steps.

S111: the control prompting module outputs a prompting signal, and the prompting signal is used for prompting a user to apply pressure to the blood pressure detection device so as to form first pressure;

s113: controlling a first pulse wave detection module to detect a first PPG signal when first pressure acts on a user;

s114: the control pressure detection module detects a first pressure;

s115: a first pressure and a first PPG signal are received, and blood pressure calibration information is determined from the first pressure and the first PPG signal.

Optionally, the cue signal includes, but is not limited to, one or more of a text signal, an image signal, a sound signal, a vibration signal, or a light signal, intended for use in generating interaction with a user. Correspondingly, in order to control the prompting module to output the prompting signals of different types, the blood pressure detecting device or the electronic device in which the blood pressure detecting device is located may include different types of prompting modules.

For example, after receiving the prompt signal, the user applies pressure to the blood pressure detection device via the first portion, and the reaction force of the blood pressure detection device against the first portion forms a first pressure against the first portion. At this time, the processor controls the first pulse wave detection module in the blood pressure detection device or the electronic equipment where the blood pressure detection device is located to detect the first PPG signal when the first pressure acts on the user, and controls the pressure detection module in the blood pressure detection device or the electronic equipment where the blood pressure detection device is located to detect the first pressure.

Then, the processor receives a first PPG signal transmitted by the first pulse wave detection module and a first pressure transmitted by the pressure detection module, and determines blood pressure calibration information according to the first pressure and the first PPG signal.

Optionally, the prompt signal is an image signal or a video signal, and may show a specific pressing manner to the user, for example, at least a part of functional modules in the blood pressure detection device, for example, the first pulse wave detection module is disposed on a side surface of the smart watch, and the prompt signal may prompt the user to press in the pressing manner shown in fig. 7, where an index finger of the user presses on one side surface of the watch, and a thumb presses on another side surface of the watch, and the first pulse wave detection module may be disposed below the thumb or the index finger.

Further, if the finger of the user presses the blood pressure detection device, that is, the first pressure acts on the finger of the user, the first light source in the first pulse wave detection module is controlled to be turned on at this time, a first optical signal is emitted to the finger of the user, and the first optical signal is reflected and/or transmitted by the finger of the user and then received by the first optical detector in the first pulse wave detection module to form a first PPG signal.

Optionally, in this embodiment, the first light source may emit an optical signal of a target wavelength band, including but not limited to a red light band or a green light band, for obtaining the first PPG signal with better signal quality.

Optionally, the prompting signal may also be used to prompt the user as to the manner in which to apply pressure, e.g., increase the applied pressure, or decrease the applied pressure. After receiving the prompting signal, the user adjusts the degree of pressing with time, for example, first applies pressure to the blood pressure detection device at a smaller degree of pressing, and then gradually increases the degree of pressing, and for example, first applies pressure to the blood pressure detection device at a larger degree of pressing, and then gradually decreases the degree of pressing. Alternatively, the pressing force may be changed in any other manner, which is not specifically limited in the embodiment of the present application.

Further, when the pressing force of the finger of the user changes, the first pressure acting on the finger of the user changes with time, and the blood volume in the blood vessel inside the finger also changes with time, so that the waveform of the first PPG signal changes with time and corresponds to different first pressures.

Fig. 8 shows a schematic flow chart of another blood pressure detecting method 100 according to the second embodiment.

As shown in fig. 8, the above step S110 may include the following steps.

S112: driving a pressure application module to apply pressure to a user to form a first pressure;

Optionally, the blood pressure detecting device or its electronic device comprises a pressure applying module, which can be used to apply pressure to the user. As an example, in embodiments of the present application, the processor may drive the pressure application module to apply pressure to the user to form the first pressure. The pressing module includes, but is not limited to, a motor driving unit or other types of driving units, which is not particularly limited in this application.

Further, when the pressure application module is driven to apply pressure to a first part of the user, such as a finger, the processor controls to turn on the first light source in the first pulse wave detection module, and transmits a first light signal to the finger of the user, and the first light signal is received by the first light detector in the first pulse wave detection module after being reflected and/or transmitted by the finger of the user, so as to form a first PPG signal.

Alternatively, in some embodiments, the pressure application module may send its pressure applied directly to the user as the first pressure to the processor.

Alternatively, in other embodiments, the blood pressure detecting apparatus or the electronic device thereof may include a pressure detecting module, and optionally, in the blood pressure detecting method 100 shown in fig. 8, before step S115, step S114 may be further included (a dashed box in fig. 8 indicates that this step is an optional step): the control pressure detection module detects a first pressure. Specifically, the processor can control the pressure detection module to detect the pressure applied to the user by the pressure application module, obtain a first pressure and send the first pressure to the processor.

Optionally, the intensity of the pressure applied to the user's finger by the pressure application module may change over time, for example, the intensity of the pressure changes from small to large or from large to small over time, or may also change in any other manner, which is not specifically limited in this embodiment of the present application.

Further, when the pressure signal applied to the finger of the user by the pressure application module changes, the first pressure acting on the finger of the user changes with time, and the blood volume in the blood vessel inside the finger also changes with time, so that the waveform of the first PPG signal changes with time and corresponds to different first pressures.

Adopt the technical scheme of this application embodiment, exert pressure to the user through the control module of exerting pressure to form first pressure, can avoid when detecting blood pressure, need the user to press voluntarily, thereby improve user experience, and compare in user's pressure of pressing, provide first pressure to the user through the control module of exerting pressure, also can prevent that the user from pressing to cause the damage to blood pressure detection device and the electronic equipment that this blood pressure detection device belongs to.

As can be seen from the above description of fig. 6 and 8, the magnitude of the first pressure acting on the user varies with time, and therefore, the detected first PPG signal varies with the magnitude of the first pressure.

In this case, fig. 9 shows a schematic flow chart of another blood pressure detection method 100.

As shown in fig. 9, the above step S115 may include the following steps.

S1151: and sequencing the first PPG signals according to the magnitude sequence of the first pressure to form an envelope signal of the first PPG signals.

S1152: a first blood pressure of the user is determined from the envelope signal, the first blood pressure being used as blood pressure calibration information.

Optionally, in step S1151, the corresponding first PPG signals at different pressures are arranged in an order that the first pressure decreases from large to small, or in an order that the first pressure increases from small to large, so as to form an envelope signal of the first PPG signal. According to the sequence of the first pressure, the formed envelope signal of the first PPG signal can accurately reflect the relation between the amplitude of the PPG signal and the change of the first pressure, compared with the envelope signal obtained in other modes, the envelope signal formed in the mode has better signal quality, and the blood pressure obtained by detecting according to the envelope signal has higher accuracy.

It is understood that, while the steps S1151 and S1152 in fig. 9 are applied to the embodiment of the blood pressure detecting method 100 shown in fig. 8, the steps S1151 and S1152 may also be applied to the embodiment of the blood pressure detecting method 100 shown in fig. 6.

Fig. 10 shows a trend of a first PPG signal when a first pressure changes from small to large.

As can be seen from fig. 10, as the first pressure gradually increases, the amplitude of the first PPG signal gradually increases, and when the amplitude reaches the maximum, the amplitude of the first PPG signal gradually decreases until disappears. Therefore, the amplitude of the envelope signal formed by the first PPG signal increases with pressure, reaches a maximum value, and then gradually decreases to zero as the pressure signal increases.

In step S1152, as an embodiment, a first blood pressure of the user, for example, a current diastolic blood pressure and systolic blood pressure of the user, may be determined according to the waveform parameter of the envelope signal and a preset function equation, and the first blood pressure may be directly used as the blood pressure calibration information.

Alternatively, the preset function equation may be a function equation determined according to multiple sets of experimental data, so as to improve the calculation reliability of calculating the blood pressure through the function equation and the waveform parameters of the envelope signal.

In order to ensure the accuracy of the blood pressure calibration information, optionally, before the step S1152, the following steps may be performed:

and judging whether the envelope signal meets a preset condition, if so, executing the step S1151, and if not, re-detecting a new PPG signal generated under a new pressure signal according to the processes of the steps S111 and S113 shown in fig. 6 or the steps S112 and S113 shown in fig. 8.

Specifically, it is determined whether the envelope signal satisfies a preset condition, that is, whether the signal quality of the envelope signal is good or bad, if the signal quality of the envelope signal is bad, it is determined that a variation trend of the detected first PPG signal along with the change of the first pressure is not obvious, and the first blood pressure detected according to the envelope signal is inaccurate, that is, the blood pressure calibration information is inaccurate.

Optionally, in this embodiment of the present application, the preset condition of the envelope signal includes, but is not limited to: integrity of the envelope signal, amplitude of maximum amplitude of the envelope signal, width of the envelope signal, and the like, which are not specifically limited in this embodiment of the application.

Optionally, in the above step, if the envelope signal does not satisfy the preset condition, it is determined whether the number of times that the envelope signal does not satisfy exceeds a threshold, if so, the blood pressure detection process is ended, and if not, a new PPG signal generated under the new pressure signal is detected again according to the process in step S110.

By adopting the mode, the repeated calibration process under the poor test condition can be avoided, the system resource is wasted, and the user is not good in experience.

Fig. 11 shows a schematic flow diagram of another blood pressure detection method 100.

As shown in fig. 11, as a possible implementation, the step S120 may include the following steps.

S121: controlling a second pulse wave detection module to detect a second PPG signal of the user;

s122: and receiving a second PPG signal, and processing the second PPG signal by adopting a pulse wave analysis method or a pulse wave conduction time measurement method to obtain the initial blood pressure of the user.

Optionally, in step S121, a second light source in the second pulse wave detection module is controlled to be turned on at the target frequency within a preset time period, and a light signal of the second light source after reflection and/or transmission by the user is received by a second light detector in the second pulse wave detection module to detect a second PPG signal.

As an example, the preset time period is 1s, the target frequency is 50Hz, and the second light source is turned on multiple times at the frequency of 50Hz, i.e. the first light source is turned on once every 20ms, so as to detect the second PPG signal within 1 s.

Of course, the preset time period and the target frequency may also be any other preset values, which is not specifically limited in the embodiment of the present application. It will be appreciated that the longer the preset time period and the higher the target frequency, the higher the accuracy of the detection of the second PPG signal.

Optionally, in this embodiment, the second light source may emit an optical signal of a target wavelength band, including but not limited to a red light band or a green light band, for obtaining a second PPG signal with better signal quality.

Optionally, in addition to controlling the second pulse wave detection module to detect the second PPG signal of the user in step S121, the first pulse wave detection module may also be controlled to detect the second PPG signal of the user. The first pulse wave detection module is controlled to detect a first PPG signal and a second PPG signal of the same part of the user in different time periods, wherein the first PPG signal is the PPG signal when first pressure acts on the user, and the second PPG signal is the PPG signal when no pressure acts on the user.

Further, as shown in fig. 11, after the second PPG signal is detected in step S121, in step S122, the second PPG signal may be processed by using the above-mentioned PTT measurement method or PWA analysis method to obtain the initial blood pressure of the user, or other related art methods may also be used to obtain the initial blood pressure of the user according to the second PPG signal, which is not specifically limited in this embodiment of the application.

Specifically, if the PTT measurement method is used to measure the blood pressure, an ECG signal corresponding to the second PPG signal needs to be measured, and the PTT is determined according to the ECG signal and the second PPG signal, so as to determine the alternating current component of the current blood pressure of the user, i.e. the initial blood pressure.

Alternatively, as shown in fig. 11, the above step S130 may include the following steps.

S131: the blood pressure calibration information is taken as a direct current component of the blood pressure of the user, and the initial blood pressure is taken as an alternating current component of the blood pressure of the user.

S132: and calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and taking the blood pressure obtained by calibration as the blood pressure of the user.

In this embodiment, the blood pressure calibration information obtained in step S110 may be the first blood pressure, and in steps S131 and S132, the first blood pressure is used as a direct current component of the current blood pressure of the user, the initial blood pressure is used as an alternating current component of the current blood pressure of the user, and the current blood pressure of the user is determined from the first blood pressure and the initial blood pressure and fed back to the user as an output.

Alternatively, in another embodiment, during the processing of the second PPG signal by the PTT measurement method or the PWA analysis method, a function equation is used to calculate a blood pressure, and based on the blood pressure calibration information, for example, the first blood pressure, the function equation parameters in the processing of the second PPG signal are calibrated so that the initial blood pressure calculated from the second PPG signal and the calibrated function equation is close to or equal to the first blood pressure, and the first blood pressure or the initial blood pressure is output to the user as the current blood pressure of the user.

The blood pressure obtained by the method is accurate, long-term and continuous blood pressure measurement can be realized, and the user experience can be improved.

On the basis of the blood pressure detection method 100 shown in fig. 5 above, fig. 12 shows a schematic view of another blood pressure detection method 100.

As shown in fig. 12, the blood pressure detecting method 100 may further include:

s140: it is determined whether the user is in motion.

If not, executing step S120 and step S130, obtaining a second PPG signal, processing the second PPG signal to obtain an initial blood pressure of the user, and determining the blood pressure of the user according to the blood pressure calibration information and the initial blood pressure.

If yes, step S120 and step S130 are not executed, and after a preset time period, step S140 is executed again, that is, whether the user is in the exercise state is determined again.

Since relative movement between the optical sensor (comprising the light source and the light detector) and the skin reduces the sensitivity of the light signal, the detection of the second PPG signal is greatly disturbed if the user is in motion. Therefore, before the second PPG is acquired, the state of the user is judged, and the second PPG signal is detected and acquired when the user is in a non-motion state, so that the accuracy of blood pressure detection can be improved.

Optionally, the state of the user may be sensed by a motion sensor, which includes but is not limited to an accelerometer, and if the user is in a stationary state, the accelerations of the three XYZ axes in the accelerometer are all 0, and the quality of the second PPG signal obtained by the test is optimal.

In some embodiments, it may be determined whether the user is in a motion state by determining whether the accelerations of the three XYZ axes in the accelerometer are within a preset threshold. The preset thresholds may be all 0, or at least one of the preset thresholds is 0, or other preset thresholds, which is not specifically limited in this embodiment of the application.

The above describes, with reference to fig. 5 to 12, various blood pressure detection methods provided in the embodiments of the present application, which utilize the same blood pressure detection apparatus, in a blood pressure detection process, two detection methods are used to obtain different PPG signals, and the results obtained in the two detection methods are combined to determine the blood pressure of the user together, so as to improve the accuracy of blood pressure detection while achieving convenient blood pressure detection.

In addition, it should be noted that, when detecting the first PPG signal, a first pressure is required to act on the body surface of the user, and in a measurement process, the first pressure is a pressure signal acting on the user in a short time, and the blood pressure measured by this method is accurate but not suitable for long-time or frequent blood pressure detection, and long-time or frequent pressure is applied to the body surface of the user, which may cause poor user experience.

In order to solve the above problem, in the present embodiment, another blood pressure detection method is proposed, based on the above blood pressure detection method 100, that is, based on the determination of the blood pressure calibration information, in the subsequent blood pressure detection process, before the blood pressure detection, it is first determined whether the calibration is currently updated, and if the calibration is updated, new blood pressure calibration information is obtained again, where the new blood pressure calibration information is obtained by processing the first PPG signal when the first pressure is applied to the user again and the first pressure applied again. In addition, a new second PPG signal when no pressure acts on the user is obtained again, a new initial blood pressure is determined, and the new initial blood pressure is calibrated by combining the new blood pressure calibration information to determine the new blood pressure of the user. And if the calibration is not updated, directly calling the previous blood pressure calibration information, acquiring a new second PPG signal when no pressure acts on the user, determining a new initial blood pressure, and then directly calibrating the new initial blood pressure based on the previous blood pressure calibration information to determine the new blood pressure of the user.

As one implementation, before obtaining the blood pressure calibration information, whether to perform calibration may be determined according to first information, which includes but is not limited to: current time information and/or user input information.

Specifically, if the first information is current time information, determining whether the current time information is within a preset time range, if the current time information is within the preset time range, performing calibration, otherwise, if the current time information is not within the preset time range, not performing calibration.

As an example, the preset time range may be a time period preset by the user, such as the same time period every month, or a time period every day, or any other preset time period. And the time information is current time information, and whether the current time is within a preset time period is judged so as to judge whether the blood pressure detection device is calibrated.

Specifically, if the first information is user input information, the user input information is used for indicating whether the user needs to calibrate the blood pressure detection device, and the blood pressure detection device is calibrated according to the user requirement.

Optionally, in this embodiment of the application, a preset time period is taken as a cycle, the blood pressure of the user may be continuously detected, and when the blood pressure of the user is detected each time, it may be flexibly determined whether to perform calibration according to first information, for example, current time information and/or user input information, and the like, that is, it is determined whether to obtain new blood pressure calibration information.

The blood pressure detection method provided by the present application is described above with reference to fig. 5 to 12, and the blood pressure detection device provided by the present application is described below with reference to fig. 13 to 19, it can be understood that the blood pressure detection device described in the following embodiments may be a device for performing the blood pressure detection method, and related technical features may be referred to in the related description above.

As shown in fig. 13, a blood pressure detecting apparatus 101 may include: a processor 11, the processor 11 being configured to:

Optionally, in further embodiments, the processor 11 is configured to:

the control prompting module 15 outputs a prompting signal, wherein the prompting signal is used for prompting the user to apply pressure to the blood pressure detection device so as to form the first pressure;

controlling a first pulse wave detection module 13 to detect the first PPG signal when the first pressure acts on the user;

the control pressure detection module 14 detects a first pressure;

the first pressure and the first PPG signal are received, and the blood pressure calibration information is determined from the first pressure and the first PPG signal.

Optionally, as shown in fig. 14, the blood pressure detecting device 101 in the embodiment of the present application may further include the above-mentioned prompting module 15, the first pulse wave detecting module 13, and the pressure detecting module 14.

Alternatively, the first pulse wave detection module 13 may include: a first light source 121, a first light detector 122, and a first signal processing module 123.

Optionally, the first light source 121 is configured to emit a first optical signal to a first part of a user, and there is a first pressure acting on the first part of the user, the first optical signal is received by the first optical detector 122 after being reflected and/or transmitted through a blood vessel in the first part, and the first optical detector 122 performs optical-electrical conversion on the received optical signal, and transmits the formed electrical signal to the first signal processing module 123 for signal processing, so as to form a first PPG signal.

Optionally, the first Light source 121 includes, but is not limited to, one or more point-like Light sources, such as a Light-Emitting Diode (LED), a Laser Diode (LD), or an infrared-Emitting Diode, and may also be a linear Light source or a planar Light source, which is not specifically limited in this embodiment of the present invention. The first light source 121 may be configured to emit a first light signal in one or more target wavelength bands, such as a red wavelength band or a green wavelength band.

Optionally, the first photo detector 122 includes, but is not limited to, a Photodiode (PD), a photo transistor, etc., which is used for photoelectric conversion. The first signal processing module 123 may include: and the signal processing circuits such as the amplifying circuit, the low-pass filter circuit, the analog-to-digital conversion circuit and the like are used for optimizing the signal quality so as to improve the blood pressure detection effect.

Optionally, a pressure sensor may be included in the pressure detection module 14 for sensing the first pressure, the pressure sensor including but not limited to: the pressure sensor may be a piezoelectric pressure sensor, a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, or another type of pressure sensor, which is not particularly limited in this embodiment of the present application.

In particular, the first light source 121 and the first light detector 122 may be located on the same side or opposite side of the first part of the user for receiving reflected and/or transmitted light after passing the first part to form the first PPG signal.

As an example, the first light source 121 and the first light detector 122 are both located on the same side of the first part of the user, for example, the blood pressure detecting device 101 is disposed on a smart watch, and the first light source 121 and the first light detector 122 are disposed adjacent to each other, which may be located on the side of the smart watch or in a key located on the side of the smart watch.

Alternatively, the pressure detection module 14 may be disposed at a side of the smart watch together with the first light source 121 and the first light detector 122, which may be disposed in stack with the first light source 121 and the first light detector 122, or may be disposed horizontally with the first light source 121 and the first light detector 122.

Specifically, the processor 11 is configured to control the prompting module 12 to output a prompting signal for prompting the user to apply pressure to the blood pressure detecting device to form a first pressure;

optionally, the cue signal includes, but is not limited to, one or more of a text signal, an image signal, a sound signal, a vibration signal, or a light signal, intended for use in generating interaction with a user. Correspondingly, the prompting module 12 includes, but is not limited to, a display unit, a light-emitting unit, a sound unit, or a vibration unit.

After receiving the prompt signal, the user applies pressure to the blood pressure detection device 101 through the first portion to generate a first pressure at the first portion, for example, the prompt module 12 is a display unit, for example, a display screen of a smart watch may be multiplexed as the prompt module 12, the display screen is configured to output the prompt signal, for example, output a pressing gesture picture or a video shown in fig. 7, after receiving the prompt signal, the user presses a finger of the user to the side of the watch in a manner shown in fig. 7, and presses the finger of the user to a key on the side of the watch, that is, presses a corresponding position of the first light source 121 and the first light detector 122.

Optionally, the prompt signal may be used to prompt the user that the intensity of the pressure applied to the blood pressure detecting device 101 is changed from large to small or from small to large, and then the first pressure detected by the pressure detecting module 14 is changed from large to small or from small to large. The user applies pressure to the blood pressure detection device 101 according to the mode, the variation trend of the first pressure is the same, and the processor 11 can sort the first PPG signals corresponding to the first pressure more conveniently according to the magnitude of the first pressure to obtain envelope signals with better signal quality, which are used for detecting the blood pressure of the user to obtain blood pressure correction information.

Fig. 15 to 17 show a top view, a bottom view and a side view of a smart watch, in particular, fig. 15 is a top view of the smart watch, i.e. the front of the smart watch; fig. 16 is a bottom view of the smart watch, i.e., the back of the smart watch; fig. 17 is a side view of the smart watch, i.e., the side of the smart watch.

As shown in fig. 15 to 17, the first light source 121 and the first light detector 122 are disposed on the side key of the smart watch, and the pressure detection module 14 is disposed on one side of the first light source 121 and the first light detector 122 close to the inside of the watch, and is stacked with the first light source 121 and the first light detector 122.

It should be noted that, in the embodiment shown in fig. 15 to 17, the pressure detection module 14 may be located inside the watch, and the first light source 121 and the first light detector 122 may be located inside the key, so that the pressure detection module 14, the first light source 121, and the first light detector 122 in fig. 15 to 17 are marked by dashed boxes.

Optionally, the processor 11 is further configured to: controlling a second pulse wave detection module 13 to detect a second PPG signal of the user;

and receiving a second PPG signal, and processing the second PPG signal by adopting a pulse wave analysis method or a pulse wave conduction time measurement method to obtain the initial blood pressure of the user.

Optionally, as shown in fig. 14, the blood pressure detecting device 101 according to the embodiment of the present application may further include the second pulse wave detecting module 13.

As an example, the second pulse wave detection module 13 may include: a second light source 131, a second light detector 132, and a second signal processing module 133.

Specifically, the second light sources 131 may be point-like light sources, the number of which is one or more, and is configured to emit second light signals of different target wavelength bands to a second part of the user, the second light signals are received by the second light detectors 132 after being reflected or transmitted through blood vessels in the second part, the number of the second light detectors 132 may also be one or more, and the one or more second light detectors 132 perform photoelectric conversion on the received light signals, and transmit the formed electrical signals to the second signal processing module 133 for signal processing, so as to form a second PPG signal.

Alternatively, the second light source 131 and the second photo detector 132 may both be located on the same side of the second part of the user, for example, the blood pressure detecting device 101 is disposed on a smart watch, and the second light source 131 and the second photo detector 132 are disposed adjacent to each other, which may be located on the back of the smart watch.

As shown in fig. 15 to 17, the smart watch includes a plurality of second light sources 131 and a plurality of second light detectors 132, wherein the plurality of second light sources 131 can emit second light signals of at least two different wavelength bands, the plurality of second light sources 131 are disposed at a central portion of a back surface of the watch, and the plurality of second light detectors 132 surround the plurality of second light sources 131.

As shown in fig. 14, in the embodiment of the present application, the processor 11 is configured to perform signal interaction with the first pulse wave detection module 12, the second pulse wave detection module 13, the prompt module 15 and the pressure detection module 14, and may be configured to generate a control signal to control the first pulse wave detection module 12, the second pulse wave detection module 13, the prompt module 15 and the pressure detection module 14 to perform corresponding functional actions, and meanwhile, may also be configured to receive various signals detected by the first pulse wave detection module 12, the second pulse wave detection module 13 and the pressure detection module 14, such as the first pressure, the first PPG signal and the second PPG signal, and perform signal processing on the various signals to obtain a blood pressure detection result.

Optionally, in other embodiments, the processor 11 is configured to:

actuating the pressurizing module 16 to pressurize the user with the first pressure to form the first pressure;

controlling the first pulse wave detection module 12 to detect the first PPG signal when the first pressure acts on the user;

Alternatively, in some embodiments, the first pressure received by the processor 11 may be the first pressure sent to it by the pressurizing module 16.

Optionally, in other embodiments, the processor 11 is further configured to: the control pressure detection module 14 detects the first pressure. The first pressure received by the processor 11 is the first pressure sent to it by the pressure detection module 14.

Optionally, as shown in fig. 18, the blood pressure detecting device 101 in the embodiment of the present application may further include the above-mentioned pressurizing module 16 and the first pulse wave detecting module 12.

Optionally, in some embodiments, the blood pressure detection device 101 may further include: a pressure detection module 14.

Further, the blood pressure detecting apparatus 101 may further include: a second pulse wave detection module 13.

Specifically, in the embodiment of the present application, the first pulse wave detection module 12, the second pulse wave detection module 13, and the pressure detection module 14 may refer to the related description of fig. 14 above, and details are not repeated herein.

In the embodiment of the present application, the processor 11 is configured to control the pressing module 16 to press the pressure to the user to form the first pressing force. Optionally, the processor 11 is configured to control the pressing module to press the user with a smaller or larger intensity, so that the first pressure is formed with a smaller or larger intensity. In some embodiments, the pressure application module 16 includes, but is not limited to, a motor driving module or other types of driving modules, which are not specifically limited in the examples of the present application.

Alternatively, if the first light source 121 and the first light detector 122 are disposed on a key of the watch, the pressing module 16 may be disposed at a side of the key for providing pressure to the key.

Fig. 19 shows a bottom view of a smart watch including the pressing module 16, i.e., a schematic view of the back of the smart watch.

As an example, as shown in fig. 19, the pressure applying module 16 may be disposed between the first light source 121, the first light detector 122 and the pressure detecting module 14, so as to facilitate the first light source 121 and the first light detector 122 to perform detection of the first PPG signal, and also to facilitate the pressure applying module 16 to apply pressure to the user by applying pressure to the module where the first light source 121 and the first light detector are located, so as to generate the first pressure, and in addition, the pressure applying module 16 is disposed adjacent to the pressure detecting module 14, so as to facilitate the pressure detecting module 14 to perform pressure detection.

It is understood that, in addition to the pressure application module 16, other functional modules in fig. 18 and 19 can refer to the above description related to fig. 15 to 18, and are not described herein again. In addition, fig. 15 to 17 and 19 only illustrate the structure of the blood pressure detecting device 101 according to the embodiment of the present application by taking a smart watch as an example, and the blood pressure detecting device 101 according to the embodiment of the present application is not limited to being disposed only on the smart watch, and may be disposed in any other type of electronic device such as a mobile phone, a computer, or a biological information detecting device, which is not specifically limited in the embodiment of the present application.

Further, the processor 11 may be configured to implement the relevant steps in the blood pressure detection method 100 above, in addition to the relevant functions described in fig. 13, fig. 14 and fig. 18 above.

Optionally, for the first pressure and the first PPG signal, the processor 11 may be configured to: sequencing the first PPG signal according to the magnitude of the first pressure to form an envelope signal of the first PPG signal; determining a first blood pressure of the user according to the waveform parameters of the envelope signal and a preset function equation; and taking the first blood pressure as blood pressure calibration information.

Optionally, for the calibration process of the blood pressure calibration information with the initial blood pressure, the processor 11 may be configured to: and taking the initial blood pressure as an alternating current component of the blood pressure of the user, and taking the blood pressure calibration information as a direct current component of the blood pressure of the user, and calibrating to obtain the blood pressure of the user.

In some embodiments, before processor 11 is configured to acquire the second PPG signal, processor 11 is further configured to: determining whether a user is in a motion state;

if not, the processor 11 is configured to: acquiring a second PPG signal;

if so, the processor 11 is configured to: and after the preset time period, re-determining whether the user is in the motion state.

In some embodiments, the processor 11 is configured to: and judging whether the acceleration value of the accelerometer is within the range of a preset threshold value or not, and determining whether the user is in a motion state or not.

Optionally, in some implementations, the blood pressure detection device 101 of the present example may include an accelerometer or other type of motion sensor. In other embodiments, the accelerometer or other types of motion sensors may also be disposed in the electronic device where the blood pressure detecting device 101 is located, which is not specifically limited by the embodiment of the present application.

Optionally, the processor 11 is configured to: acquiring a first PPG signal at a first part of a user;

a second PPG signal is acquired at a second part of the user, wherein the second part is different from the first part.

Optionally, the first location is a finger of the user and the second location is a wrist of the user.

The embodiment of the present application further provides a blood pressure detecting apparatus, which includes a processor and a memory, where the memory is used to store a computer program, and the processor is used to call the computer program to execute the blood pressure detecting method 100 in any of the embodiments of the present application.

The embodiment of the present application further provides an electronic device, which may include the blood pressure detection apparatus 101 in any of the embodiments of the present application.

Alternatively, the electronic device may be a smart watch or a mobile phone, and the blood pressure detecting device 101 may be disposed on any surface of the electronic device, for example, on the back or side of the electronic device.

Furthermore, the blood pressure detecting device 101 may be disposed in a key on the surface of the electronic device, and the key may be used only for blood pressure detection, or may be used for realizing other functions of the electronic device in addition to blood pressure detection.

It should be understood that the processing unit or processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. It is understood that the blood pressure detecting device of the embodiment of the present application may further include a storage unit or a memory, and the memory may be a volatile memory or a nonvolatile memory, or may include both a volatile memory and a nonvolatile memory.

Embodiments of the present application also provide a computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a portable electronic device comprising a plurality of application programs, enable the portable electronic device to perform the method of the above-illustrated embodiments.

The embodiments of the present application also propose a computer program, which includes instructions that, when executed by a computer, make the computer perform the method of the above-illustrated embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A blood pressure detection method is applied to a blood pressure detection device and is characterized by comprising the following steps:

acquiring a second photoplethysmography (PPG) signal, and processing the second photoplethysmography (PPG) signal to obtain the initial blood pressure of the user;

and calibrating the initial blood pressure according to the blood pressure calibration information, and taking the calibrated blood pressure as the blood pressure of the user.

2. The method of claim 1, wherein the obtaining blood pressure calibration information comprises:

driving a pressure application module to apply pressure to the user to form the first pressure;

control a first pulse wave detection module to detect the first photoplethysmography (PPG) signal when the first pressure is acting on the user;

the control pressure detection module detects the first pressure;

receiving the first pressure and the first photoplethysmography (PPG) signal, and determining the blood pressure calibration information from the first pressure and the first photoplethysmography (PPG) signal.

3. The method of claim 1, wherein the obtaining blood pressure calibration information comprises:

controlling a prompting module to output a prompting signal, wherein the prompting signal is used for prompting the user to apply pressure to the blood pressure detection device so as to form the first pressure;

the control pressure detection module detects the first pressure;

receiving the first pressure and the first photoplethysmography (PPG) signal, determining the blood pressure calibration information from the first pressure and the first photoplethysmography (PPG) signal.

4. The method according to claim 2 or 3, wherein the first pressure is changed from large to small or from small to large with time.

5. A method for blood pressure detection according to any of claims 1 to 3, wherein said obtaining a second photoplethysmography, PPG, signal and processing from the second photoplethysmography, PPG, signal an initial blood pressure of the user comprises:

control a second pulse wave detection module to detect the second photoplethysmography, PPG, signal of the user;

receiving the second photoplethysmography PPG signal, and processing the second photoplethysmography PPG signal by adopting a pulse wave analysis method or a pulse wave conduction time measurement method to obtain the initial blood pressure of the user.

6. A method of blood pressure detection according to any of claims 1 to 3, wherein the first pressure varies over time, the determining of the blood pressure calibration information from the first pressure and the first photoplethysmography, PPG, signal comprising:

sequencing the first photoplethysmography (PPG) signal corresponding to the first pressure according to the magnitude of the first pressure to form an envelope signal of the first photoplethysmography (PPG) signal;

determining a first blood pressure of the user from the envelope signal;

and taking the first blood pressure as the blood pressure calibration information.

7. The method according to claim 6, wherein the calibrating the initial blood pressure based on the blood pressure calibration information and the setting the calibrated blood pressure as the blood pressure of the user comprises:

taking the blood pressure calibration information as a direct current component of the blood pressure of the user;

taking the initial blood pressure as an alternating component of the user's blood pressure;

and calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and taking the blood pressure obtained by calibration as the blood pressure of the user.

8. A blood pressure detection method according to any of claims 1 to 3, characterized in that before said acquiring a second photoplethysmography, PPG, signal, the blood pressure detection method further comprises:

determining whether the user is in motion;

if not, acquiring the second photoplethysmography PPG signal;

if yes, after a preset time period, re-determining whether the user is in the motion state.

9. A method for blood pressure detection according to any of claims 1 to 3, wherein said acquiring a first photoplethysmography, PPG, signal comprises:

acquiring the first photoplethysmography (PPG) signal at a first location of the user;

the acquiring a second photoplethysmography, PPG, signal, comprising:

acquiring the second photoplethysmography (PPG) signal at a second part of the user, wherein the second part is different from the first part.

10. The method of claim 9, wherein the first portion is a finger of the user and the second portion is a wrist of the user.

11. A blood pressure detection device comprising a processor configured to:

12. The blood pressure detection device of claim 11, wherein the processor is configured to:

driving a pressure application module to apply the first pressure to the user to form the first pressure;

the control pressure detection module detects the first pressure;

13. The blood pressure detection device according to claim 12, further comprising: the pressure applying module is electrically connected with the processor, and the first pulse wave detecting module is electrically connected with the processor.

14. The blood pressure detection device of claim 11, wherein the processor is configured to:

the control pressure detection module detects the first pressure;

15. The blood pressure detection device according to claim 14, further comprising: the prompting module is electrically connected with the processor, and the first pulse wave detection module is electrically connected with the processor.

16. A blood pressure monitor according to claim 12 or 14, wherein the first pressure is smaller or larger with time.

17. A blood pressure detection device according to any of claims 11 to 15, wherein the processor is configured to:

18. The blood pressure monitor according to claim 17, further comprising: the second pulse wave detection module is electrically connected with the processor.

19. A blood pressure detection device according to any of claims 11 to 15, wherein the first photoplethysmography, PPG, signal varies with the magnitude of the first pressure;

the processor is configured to: sequencing the first photoplethysmography (PPG) signal according to the magnitude of the first pressure to form an envelope signal of the first photoplethysmography (PPG) signal;

determining a first blood pressure of the user from the envelope signal;

20. The blood pressure detection device of claim 19, wherein the processor is configured to:

using the blood pressure calibration information as a direct current component of the blood pressure of the user,

21. A blood pressure detection device according to any of claims 11 to 15, wherein before the processor is configured to acquire a second photoplethysmography, PPG, signal, the processor is further configured to: determining whether the user is in motion;

if not, acquiring the second photoplethysmography PPG signal;

22. A blood pressure detection device according to any of claims 11 to 15, wherein the processor is configured to:

23. The blood pressure monitor of claim 22, wherein said first location is a finger of said user and said second location is a wrist of said user.

24. An electronic device, comprising:

a blood pressure monitor according to any of claims 11 to 23.

25. The electronic device of claim 24, wherein the electronic device is a smart watch.