CN215424574U - Korotkoff sound electronic sphygmomanometer - Google Patents
Korotkoff sound electronic sphygmomanometer Download PDFInfo
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- CN215424574U CN215424574U CN202022531678.6U CN202022531678U CN215424574U CN 215424574 U CN215424574 U CN 215424574U CN 202022531678 U CN202022531678 U CN 202022531678U CN 215424574 U CN215424574 U CN 215424574U
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Abstract
The utility model discloses a Korotkoff sound electronic sphygmomanometer, which comprises a pressure generating module, an acquisition module, a blood pressure judging module, a display module and a main control module, wherein the pressure generating module is used for generating a pressure signal; the acquisition module comprises a Korotkoff sound acquisition module, an environmental sound acquisition module, a motion signal acquisition module and a cuff pressure acquisition module; the Korotkoff sound acquisition module comprises a first preprocessing circuit; the first preprocessing circuit comprises a first adaptive filter and a second adaptive filter, the first adaptive filter is electrically connected with the ambient sound acquisition module, and the second adaptive filter is electrically connected with the motion signal acquisition module. The embodiment of the utility model realizes the functions of environment adaptive noise removal and subject motion artifact adaptive suppression by collecting the environment sound signal, the motion signal and the adaptive filter, reduces the interference of the environment and the self motion of the subject on the blood pressure measurement result, reduces the requirement on the measurement environment and improves the accuracy of the blood pressure measurement result.
Description
Technical Field
The utility model relates to the field of medical equipment, in particular to a Korotkoff sound electronic sphygmomanometer.
Background
In non-invasive blood pressure measurement, the Korotkoff (1905) is the only accepted blood pressure measurement and measurement 'gold standard' in world medicine, namely, the upper arm is bound and pressurized by a cuff, and the brachial artery is decompressed after being deflated; as the cuff pressure decreases, the stethoscope placed in the cuff can hear the sound produced when the blood flow has flushed the blood vessel again; accordingly, the cuff pressure corresponding to the "first sound" is referred to as systolic pressure, and the cuff pressure corresponding to the "last sound" is referred to as diastolic pressure, wherein the cuff pressure value is usually measured by a mercury sphygmomanometer or a barometer.
The traditional auscultatory method for measuring blood pressure comprises the following steps:
firstly, the operation process is complex, and the listening, the watch viewing and the air discharging need to be synchronized in real time;
secondly, the operators are easily interfered by self states such as vision, hearing, energy and the like;
the operator is easily influenced by the environment of the measuring site, such as noise and the like;
the professional level of the operator is also an important investigation point.
In order to improve the stability of the korotkoff sound auscultation electronic sphygmomanometer, a plurality of scholars propose a measurement method combining an oscillometric method and a korotkoff sound method. The method generally comprises the steps of taking an oscillometric measurement result as a reference, giving an approximate range of systolic pressure and diastolic pressure, finding the occurrence positions of the systolic pressure and the diastolic pressure by a Korotkoff sound method, and further determining a blood pressure value. The technology tries to improve the stability of the measurement result of the Korotkoff sound method through the stability of the oscillometric method; however, this method does not overcome the accuracy deficiencies of the oscillometric method. In addition, the Shu Mengsun academy scientific research team uses the Korotkoff sound time delay characteristic (the inherent characteristic of human physiology) to evaluate the measurement accuracy of the Korotkoff sound listening method electronic sphygmomanometer, but the method has higher requirement on the accuracy of the acquisition of the position of the starting point of the cardiac cycle and is easy to be interfered in the actual measurement process.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a Korotkoff sound electronic sphygmomanometer which can reduce the interference of the environment and the self movement of a testee on the blood pressure measurement result.
According to the embodiment of the utility model, the electronic sphygmomanometer comprises: the blood pressure monitoring device comprises a pressure generating module, an acquisition module, a blood pressure judging module, a display module and a main control module which is connected with the pressure generating module, the acquisition module, the blood pressure judging module and the display module; the acquisition module comprises a Korotkoff sound acquisition module, an environmental sound acquisition module, a motion signal acquisition module and a cuff pressure acquisition module; the Korotkoff sound acquisition module comprises a first preprocessing circuit; the first preprocessing circuit comprises a first adaptive filter and a second adaptive filter, the first adaptive filter is electrically connected with the environment sound acquisition module, and the second adaptive filter is electrically connected with the motion signal acquisition module.
The embodiment of the utility model at least has the following beneficial effects: according to the embodiment of the utility model, the environment sound signal and the motion signal are collected, and the Korotkoff sound signal, the collected environment sound signal and the collected motion signal are respectively passed through the adaptive filter, so that the functions of environment adaptive noise removal and subject motion artifact adaptive suppression are realized, the interference of the environment and the subject motion to the blood pressure measurement result is reduced, the requirement on the measurement environment is reduced, and the accuracy of the blood pressure measurement result is improved.
According to some embodiments of the utility model, the korotkoff sound collection module comprises a first PVDF piezoelectric film electrically connected to the first pre-processing circuit, and the ambient sound collection module comprises a second PVDF piezoelectric film.
According to some embodiments of the utility model, the motion signal acquisition module comprises a three-axis acceleration sensor.
According to some embodiments of the utility model the first pre-processing circuit comprises a first notch filter, the ambient sound acquisition module comprises a second notch filter, and the motion signal acquisition module comprises a third notch filter. The collected Korotkoff tone signals pass through a notch filter (50Hz), power frequency interference is removed, and original Korotkoff tone signal information is reserved; and (3) enabling the environment sound signal and the motion signal to pass through a notch filter (50Hz) to remove power frequency interference.
According to some embodiments of the utility model, the first pre-processing circuit comprises a band-pass filter. And (3) passing the collected Korotkoff tone signal through a band-pass filter (1-500Hz) to remove high-frequency interference.
According to some embodiments of the utility model, the first adaptive filter is electrically connected to the second notch filter, the second adaptive filter is electrically connected to the first adaptive filter and a third notch filter; or the first adaptive filter is electrically connected to the third notch filter, and the second adaptive filter is electrically connected to the first adaptive filter and the second notch filter. Passing the Korotkoff tone signal and the environmental sound signal through a self-adaptive filter to obtain a Korotkoff tone signal without environmental interference; and (4) enabling the Korotkoff tone signal and the motion signal to pass through a self-adaptive filter to obtain the Korotkoff tone signal without motion interference.
According to some embodiments of the utility model, the pressure generating module comprises an inflator, a bleed valve, and a drive circuit. The air pump and the air release valve of the pressure generating module are controlled by the driving circuit to realize the air charging and discharging processes.
According to some embodiments of the utility model, the cuff pressure acquisition module comprises a gas pressure sensor and an analog signal conditioning circuit connected to the gas pressure sensor.
According to some embodiments of the utility model, the blood pressure discrimination module comprises an FPGA or a DSP processor.
According to some embodiments of the utility model, the display module comprises an OLED or LCD display screen.
According to some embodiments of the utility model, the korotkoff sound electronic sphygmomanometer further comprises an external interface module, wherein the external interface module supports a wireless or wired data transmission mode.
According to some embodiments of the utility model, the master control module comprises a 16-bit or 32-bit microcontroller.
According to some embodiments of the utility model, the korotkoff sound electronic sphygmomanometer further comprises a power supply module, and the power supply module supports a lithium battery or a 220V mains supply mode.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a Korotkoff sound electronic sphygmomanometer according to an embodiment of the present invention.
Fig. 2 is a block diagram of a korotkoff sound acquisition module according to an embodiment of the present invention.
Fig. 3 is a block diagram of a first preprocessing circuit according to an embodiment of the present invention.
Fig. 4 is a block diagram of a first preprocessing circuit module according to another embodiment of the utility model.
Fig. 5 is a block diagram of an ambient sound collection module according to an embodiment of the present invention.
Fig. 6 is a block diagram of a motion signal acquisition module according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating the connection between a notch filter and an adaptive filter according to an embodiment of the present invention.
Fig. 8 is a block diagram of a pressure generation module according to an embodiment of the present invention.
Fig. 9 is a block diagram of a cuff pressure acquisition module according to an embodiment of the present invention.
FIG. 10 is a block diagram of a Korotkoff sound electronic sphygmomanometer according to another embodiment of the present invention.
Fig. 11 is a schematic flow chart of implementing blood pressure measurement according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Accurate measurement of blood pressure is an important part of the current hypertension prevention and control work and is an important means for improving the hypertension management level. The hypertension management can effectively restrain the high incidence situation of hypertension and other cardiovascular diseases and reduce the risk of serious complications of hypertension patients. In the high blood pressure management, the noninvasive blood pressure measurement scheme is widely adopted due to small influence on a subject and convenient operation, and particularly, oscillography electronic blood pressure is taken as the main point in the aspect of related equipment.
The oscillography has a defect in the measurement principle, and the blood pressure is not directly measured but calculated based on the statistical result of the blood pressure of people. The Korotkoff (1905) is a unique non-invasive blood pressure measurement and measurement "gold standard" that has been accepted by the world medical community since its introduction because its measurement principle can truly reflect the change of human blood pressure. At present, the korotkoff sound auscultation method has serious dependence on the professional level of a doctor (needing professional training) and the measurement environment (needing to be as quiet as possible) in the measurement process, and the korotkoff sound auscultation method becomes an important reason for restricting the development of the korotkoff sound auscultation method.
In order to overcome the limitations and inconvenience of the traditional auscultation method in use, the utility model designs an upper-arm Korotkoff auscultation electronic sphygmomanometer which comprises the functions of environment self-adaptive noise removal and subject motion artifact self-adaptive inhibition. The utility model realizes the observation of the measuring process, the traceability of the measured data and the expandable application of the measuring result, has low requirement on the medical professional literacy of the operator in the measuring process, and is convenient for hospitals (including medical college teaching) and families to use.
The utility model adopts a common upper arm type single cuff design idea, the measurement process comprises quick inflation and uniform slow deflation, and the pressure values corresponding to the appearance and disappearance moments of the Korotkoff sounds are determined in the deflation process and are the systolic pressure and the diastolic pressure in sequence. In the measuring process, the cuff pressurization and inflation process is completed within 5-10s, and the cuff pressure relief and deflation process is completed within 60 s; linear deflation, wherein the deflation speed is 2-3 mmHg/second (international traffic practice); when diastolic pressure is detected, the rapid deflation mode is turned on until the cuff pressure drops to 0 mmHg.
Referring to fig. 1, the electronic sphygmomanometer according to the embodiment of the present invention mainly includes an acquisition module (a korotkoff sound acquisition module, an environmental sound acquisition module, a motion signal acquisition module, a cuff pressure acquisition module), a pressure generation module, an equipment main control module (including data storage), a blood pressure determination module, and a display module.
In some embodiments, the electronic blood pressure monitor of the embodiments of the present invention further includes a peripheral interface module, an apparatus switch and key control module, a power supply module, a cuff, a rubber tube, and the like.
Referring to fig. 2, in some embodiments, the korotkoff sound acquisition module includes a first PVDF piezoelectric film and a first pre-processing circuit coupled thereto. The first PVDF piezoelectric film is used for collecting Korotkoff tone signals and then transmitting the signals to the first preprocessing circuit, and the first preprocessing circuit preprocesses the collected original Korotkoff tone signals.
In some embodiments, the ambient sound collection module includes a second PVDF piezoelectric film. The second PVDF piezoelectric film is used for collecting environmental sound signals.
In some embodiments, the motion signal acquisition module comprises a three-axis acceleration sensor. The triaxial acceleration sensor collects the motion posture of a subject in the blood pressure measurement process.
Referring to fig. 3, in some embodiments, the first pre-processing circuit includes a first adaptive filter electrically connected to the ambient sound acquisition module and a second adaptive filter electrically connected to the motion signal acquisition module. Passing the Korotkoff tone signal and the environmental sound signal through a self-adaptive filter to obtain a Korotkoff tone signal without environmental interference; and (4) enabling the Korotkoff tone signal and the motion signal to pass through a self-adaptive filter to obtain the Korotkoff tone signal without motion interference.
Referring to fig. 4, in some embodiments, the first pre-processing circuit further includes a band pass filter and a first notch filter. The Korotkoff tone signal passes through a band-pass filter (1-500Hz) to remove high-frequency interference, and passes through a first notch filter (50Hz) to remove power frequency interference and keep the information of the original Korotkoff tone signal.
Referring to fig. 5, in some embodiments, an ambient sound collection module includes a second PVDF piezoelectric film and a second notch filter coupled thereto. The second PVDF piezoelectric film is used for collecting an environment sound signal and then transmitting the signal to a second notch filter, and the second notch filter is used for preprocessing the collected original environment sound signal. And (3) removing power frequency interference of the environment sound signal by passing the environment sound signal through a notch filter (50 Hz).
Referring to fig. 6, in some embodiments, the motion signal acquisition module includes a three-axis acceleration sensor and a third notch filter connected thereto. The three-axis acceleration sensor collects the motion posture of a subject in the blood pressure measurement process, then transmits signals to the third notch filter, and the third notch filter preprocesses the collected motion signals. And removing power frequency interference of the motion signal by passing the motion signal through a notch filter (50 Hz).
Referring to fig. 7, as shown in part a of fig. 7, in some embodiments, a first adaptive filter is electrically connected to a second notch filter, the second adaptive filter is electrically connected to the first adaptive filter and a third notch filter; as shown in part b of fig. 7, in some embodiments, the first adaptive filter is electrically connected to the third notch filter, and the second adaptive filter is electrically connected to the first adaptive filter and the second notch filter.
Referring to FIG. 8, in some embodiments, the pressure generating module includes an inflator, a bleed valve, and a drive circuit.
Referring to fig. 9, in some embodiments, the cuff pressure acquisition module includes a gas pressure sensor and analog signal conditioning circuitry connected to the gas pressure sensor.
Referring to fig. 10, in some embodiments, the korotkoff electronic sphygmomanometer mainly includes a korotkoff sound collection module, an ambient sound collection module (PVDF piezoelectric film, analog signal preprocessing circuit), a motion signal collection module (triaxial acceleration sensor, analog signal preprocessing circuit), a cuff pressure collection module (gas pressure sensor, analog signal conditioning circuit), a pressure generation module (linear charge/discharge pump, drive control circuit), an equipment main control module (including data storage), a blood pressure determination module (using FPGA or DSP processing module), a peripheral interface module, a display module, an equipment switch and key control module, a power supply module, a cuff, a rubber tube, and the like.
Wherein, the frequency response of the piezoelectric film sensor contained in the Korotkoff sound acquisition module is 1-1000 Hz; the response frequency of the environmental sound acquisition module is also 1-1000Hz (in practical situation, the materials of the Korotkoff sound sensor and the environmental sound sensor and the characteristic parameters thereof need to be kept consistent); the motion signal acquisition module acquires the motion posture of a subject in the blood pressure measurement process through the three-axis acceleration sensor; the cuff pressure acquisition module is used for measuring the pressure value in the cuff in the processes of quick inflation and uniform speed slow deflation; the pressure generating module comprises an inflating pump and an air release valve which are controlled by corresponding driving circuits to realize the inflating and deflating processes; the main control module of the equipment adopts a 16-bit or 32-bit microcontroller to realize the functions of synchronous acquisition of multiple paths of signals, display control, power control, data transmission, on-off control of the equipment and the like; the blood pressure judging module adopts an FPGA or DSP processor to realize high-speed numerical operation and complete the function of blood pressure judgment; the display module adopts an OLED or LCD display screen to realize dynamic measurement waveform display, retrospective display of measurement data and display of blood pressure measurement results (including systolic pressure, diastolic pressure, average pressure, respiratory rate and pulse rate); the peripheral interface module supports a wireless (such as Bluetooth, WIFI, cellular mobile communication and the like) or wired (such as USB and the like) data transmission mode; the power supply module supports a lithium battery or a 220V mains supply mode.
Referring to fig. 11, a blood pressure measuring method of an electronic blood pressure monitor according to an embodiment of the present invention includes the steps of:
synchronously acquiring Korotkoff sounds, environmental sounds, motion signals and cuff pressure signals;
step two, removing power frequency interference and high frequency interference from the acquired Korotkoff tone signals of the step one through a band-pass filter (1-500Hz) and a notch filter (50Hz), and reserving the information of the original Korotkoff tone signals; ambient sound and motion signals pass through a notch filter (50Hz) to remove power frequency interference;
thirdly, the echo tone signal obtained in the second step and the environmental sound signal without the 50Hz power frequency interference in the second step are processed by a self-adaptive filter to obtain the echo tone signal without the environmental interference;
step four, the Korotkoff tone signal obtained in the step three and the motion signal without the 50Hz power frequency interference in the step two are processed by a self-adaptive filter to obtain the Korotkoff tone signal without the motion interference;
step five, carrying out normalization processing on the Korotkoff tone signals obtained in the step four (taking the maximum value of the signal amplitude as a reference) to obtain normalized Korotkoff tone signals;
taking a proper wavelet base, and performing 5-layer (general, 5-6 layers) wavelet transformation on the normalized Korotkoff tone signal obtained in the step five to obtain a detail wavelet coefficient;
step seven, determining the peak value of the detail wavelet coefficient of the 5 th layer by applying a peak value detection method combining a root mean square value and a threshold value;
step eight, taking the sampling time as a reference, and corresponding the peak value of the detail wavelet coefficient of the layer 5 with the cuff pressure signal acquired in the step one; according to the time sequence, the cuff pressure value corresponding to the first detail wavelet coefficient peak value is the systolic pressure, and the cuff pressure value corresponding to the last detail wavelet coefficient peak value is the diastolic pressure.
The first step, the second step, the third step, the fourth step, the fifth step, the sixth step and the eighth step are realized by an acquisition module and a blood pressure judgment module.
Although specific embodiments have been described herein, those of ordinary skill in the art will recognize that many other modifications or alternative embodiments are equally within the scope of this disclosure. For example, any of the functions and/or processing capabilities described in connection with a particular device or component may be performed by any other device or component. In addition, while various illustrative implementations and architectures have been described in accordance with embodiments of the present disclosure, those of ordinary skill in the art will recognize that many other modifications of the illustrative implementations and architectures described herein are also within the scope of the present disclosure.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A korotkoff sound electronic sphygmomanometer, comprising:
pressure generation module, acquisition module, blood pressure discrimination module, display module and
the main control module is connected with the pressure generation module, the acquisition module, the blood pressure judgment module and the display module;
the acquisition module comprises a Korotkoff sound acquisition module, an environmental sound acquisition module, a motion signal acquisition module and a cuff pressure acquisition module;
the Korotkoff sound acquisition module comprises a first preprocessing circuit;
the first preprocessing circuit comprises a first adaptive filter and a second adaptive filter, the first adaptive filter is electrically connected with the environment sound acquisition module, and the second adaptive filter is electrically connected with the motion signal acquisition module.
2. The Korotkoff tone electronic sphygmomanometer according to claim 1, wherein the Korotkoff tone acquisition module includes a first PVDF piezoelectric film electrically connected to the first preprocessing circuit, and the ambient sound acquisition module includes a second PVDF piezoelectric film.
3. The Korotkoff sound electronic sphygmomanometer according to claim 1, wherein the motion signal collecting module includes a three-axis acceleration sensor.
4. The Korotkoff sound electronic sphygmomanometer of claim 1, wherein the first preprocessing circuit comprises a first notch filter, the ambient sound collection module comprises a second notch filter, and the motion signal collection module comprises a third notch filter.
5. The Korotkoff sound electronic sphygmomanometer according to claim 1, wherein the first preprocessing circuit includes a band-pass filter.
6. The Korotkoff sound electronic sphygmomanometer according to claim 4,
the first adaptive filter is electrically connected to the second notch filter, and the second adaptive filter is electrically connected to the first adaptive filter and a third notch filter; or
The first adaptive filter is electrically connected to the third notch filter, and the second adaptive filter is electrically connected to the first adaptive filter and the second notch filter.
7. The Korotkoff sound electronic sphygmomanometer according to claim 1, wherein the pressure generating module comprises an inflator, a release valve and a driving circuit.
8. The Korotkoff sound electronic sphygmomanometer according to claim 1, wherein the cuff pressure collecting module comprises a gas pressure sensor and an analog signal conditioning circuit connected to the gas pressure sensor.
9. The Korotkoff sound electronic sphygmomanometer according to claim 1, wherein the blood pressure discrimination module comprises an FPGA or a DSP processor.
10. The Korotkoff sound electronic sphygmomanometer according to claim 1, wherein the main control module comprises a 16-bit or 32-bit microcontroller.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116807435A (en) * | 2023-08-28 | 2023-09-29 | 嘉兴学院G60科创走廊产业与创新研究院 | Portable heart sound sensing device and heart rate monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116807435A (en) * | 2023-08-28 | 2023-09-29 | 嘉兴学院G60科创走廊产业与创新研究院 | Portable heart sound sensing device and heart rate monitoring system |
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