CN221844743U - A portable health monitoring device - Google Patents

Abstract

The utility model relates to the technical field of equipment, and particularly discloses portable health monitoring equipment, which comprises the following components: the device comprises a shell, a display screen, keys, a loudspeaker, a power indicator lamp, a power switch and a clamping groove; the display screen, the keys and the power indicator lamp are arranged on the front surface of the shell; the power switch and the clamping groove are arranged on the side face of the shell; the top of the shell comprises two wire connectors, wherein one wire connector is connected with a plurality of electrocardiograph monitoring electrodes through wires, and the other wire connector is connected with a finger-clip type blood oxygen probe through wires; a central processing unit, a target microprocessor and a communication module are arranged in the shell; the central processing unit is respectively connected with the target microprocessor, the communication module, the display screen, the keys, the loudspeaker, the power indicator lamp, the power switch and the clamping groove; the target microprocessor is connected with two wire connectors.

Description

A portable health monitoring device

Technical Field

The utility model relates to the technical field of health monitoring equipment, in particular to a portable health monitoring equipment.

Background Art

In Asian populations, the overall prevalence of obstructive sleep apnea syndrome in adults over 18 years old has reached 8.5%. Among patients with coronary heart disease, stroke, heart failure and arrhythmia, the prevalence of sleep apnea is as high as 65%, 75%, 55% and 50% respectively. Therefore, it is necessary to monitor the ECG and sleep of patients with heart disease at home in a timely manner, which is conducive to timely detection of abnormalities and intervention.

Currently, there are many types of ECG monitoring devices, but they are limited to ECG, respiration and other functions. There is no remote real-time ECG monitoring device that can remotely and in real time monitor the patient's ECG, respiration, sleep, blood oxygen saturation and other functions.

Utility Model Content

In view of the above problems, the purpose of the utility model is to provide a portable health monitoring device, which integrates an electrocardiorespiratory module and a blood oxygen saturation module, monitors the patient's vital signs in real time through a WIFI or 4G communication module, and has the function of storing and exporting relevant vital signs data, so as to facilitate medical staff to review the changes in the patient's vital signs.

The utility model provides a portable health monitoring device, including: a housing, a display screen, buttons, a speaker, a power indicator light, a power switch, and a card slot;

The display screen, buttons, and power indicator light are arranged on the front of the housing; the power switch and the card slot are arranged on the side of the housing;

The top of the housing includes two wire connection ports, one of which is connected to a plurality of ECG monitoring electrodes via wires, and the other is connected to a finger-clip type blood oxygen sensor via wires;

The shell is provided with a central processing unit, a target microprocessor and a communication module; the central processing unit is respectively connected with the target microprocessor, the communication module, the display screen, the buttons, the speaker, the power indicator light, the power switch and the card slot; the target microprocessor is connected with the two wire connection ports.

In a possible implementation, the wire connection port further includes a wire clamping slot for fixing the wire.

In a possible implementation, the housing further includes a positioning module;

The positioning module is connected to the central processing unit and is used to obtain position information.

In a possible implementation, an environmental sensor is also provided on the housing;

The environmental sensor is connected to the central processing unit and is used to obtain environmental information;

The environment sensor includes at least one of a brightness sensor and a sound sensor.

In a possible implementation, the housing further includes a data storage module;

The data storage module is connected to the central processing unit and is used for storing data.

In a possible implementation, the housing further includes a power module;

The power supply module is connected to the central processing unit and is used for providing power.

In a possible implementation, the target microcontroller includes an electrocardiogram microcontroller and a blood oxygen microcontroller;

The electrocardiogram microcontroller is connected to the plurality of electrocardiogram monitoring electrodes; the blood oxygen microcontroller is connected to the finger-clip type blood oxygen probe.

In a possible implementation, it also includes a differential amplifier circuit, a low-pass active filter, a voltage follower, a first-order low-pass filter, an H-bridge drive circuit, and a constant current source drive circuit;

The finger-clip blood oxygen sensor is connected to a differential amplifier circuit, a low-pass active filter, a voltage follower, a first-order low-pass filter, and a blood oxygen microcontroller in sequence; the H-bridge drive circuit is connected to the finger-clip blood oxygen sensor and a constant current source drive circuit respectively.

In a possible implementation manner, the display screen is a touch screen.

In a possible implementation, the plurality of ECG monitoring electrodes are 5 ECG monitoring electrodes.

The portable health monitoring device provided by the utility model can monitor vital sign signals in real time and is suitable for home patients suffering from heart disease, chronic obstructive pulmonary disease, sleep apnea, etc.; by using modern communication technology, electronic technology, computer technology and other scientific and technological forces, it can monitor electrocardiogram, respiration, blood oxygen saturation, pulse rate, perfusion index, sleep and other functions in real time, remotely and continuously, realize remote real-time monitoring of patients, facilitate timely detection of abnormalities and intervention, thereby realizing the clinical efficacy of disease screening and prevention and disease progression monitoring, and is a new model of telemedicine service.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of a portable health monitoring device provided by an embodiment of the present invention;

FIG2 is a side view of a portable health monitoring device provided by an embodiment of the present invention;

FIG3 is a schematic diagram of the operation of the portable health monitoring device provided by an embodiment of the present utility model.

FIG4 is a schematic diagram of the structure of a blood oxygen monitoring device provided by an embodiment of the present utility model;

FIG5 is a schematic diagram of the circuit structure of a blood oxygen monitoring device provided in an embodiment of the present utility model.

DETAILED DESCRIPTION

The following detailed description of the embodiments of the present invention is further described in detail in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the preferred embodiments described, and the scope of the present invention is defined by the claims.

In the description of the present invention, it should be noted that, unless otherwise specified, “plurality” means two or more; the terms “first”, “second”, etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

FIG. 1 is a front schematic diagram of a portable health monitoring device provided in an embodiment of the present invention, and FIG. 2 is a side schematic diagram of a portable health monitoring device provided in an embodiment of the present invention. As shown in FIG. 1 and FIG. 2, the portable health monitoring device provided in the present invention includes:

The utility model provides a portable health monitoring device, including: a housing 1, a display screen 2, a button 3, a speaker 4, a power indicator light 5, a wire connection port 6, a charging port 7, a power switch 8, and a card slot 9. The display screen 2 and the speaker 4 are output devices, while the display screen 2 and the button 3 are input devices.

The housing 1 includes a front cover 11 and a rear cover 12, which are a hollow and sealed structure when buckled together. The display screen 2, the button 3, and the power indicator light 5 are arranged on the front of the housing 1. The wire connection port 6, the charging port 7, the power switch 8, and the card slot 9 are arranged on the side of the housing 1.

The top of the housing 1 includes two wire connection ports 6, one of which is connected to a plurality of ECG monitoring electrodes via wires, and the other is connected to a finger-clip type blood oxygen sensor via wires.

A central processing unit, a target microprocessor and a communication module are arranged in the housing 1; the central processing unit is respectively connected to the target microprocessor, the communication module, the display screen 2, the button 3, the speaker 4, the power indicator light 5, the power switch 8 and the card slot 9; the target microprocessor is connected to two wire connection ports 6.

The power indicator light 5 is used to indicate whether the device is working, and the card slot 9 is used to place a 4G card.

In a possible implementation, the portable health monitoring device further includes a wire slot 10. The wire slot 10 is provided at the wire connection port 6 and is used to fix the wire.

In a possible implementation, the housing 1 further includes a positioning module, which is connected to the central processing unit and is used to obtain position information.

In a possible implementation, an environmental sensor is also provided on the housing 1. The environmental sensor is connected to the central processing unit and is used to obtain environmental information. The environmental sensor includes at least any one of the following: a brightness sensor and a sound sensor.

In a possible implementation, the housing 1 further includes a data storage module, which is connected to the central processing unit and is used to store data.

In a possible implementation, the housing 1 further includes a power module, which is connected to the central processing unit and is used to provide power.

The display screen 2 is a touch screen, which can be a capacitive touch screen or a resistive touch screen.

Capacitive touch screens are used by directly touching with fingers, such as mobile phones, tablets, etc. Capacitive touch screens only require touch, not pressure to generate signals. Capacitive touch screens only need to be calibrated once or not at all after production. Capacitive screens have a long service life because the components in the capacitive touch screen do not need to move. Capacitive technology is superior to resistive technology in terms of light loss and system power consumption. Capacitive technology is wear-resistant, has a long life, and has low maintenance costs when used by users. Capacitive touch screens have a better user experience and are the preferred functional module for handheld monitoring systems.

Resistive touch screens require direct contact with a stylus and a certain amount of pressure. They work by inducing current between the upper and lower ITO layers. Resistive technology requires regular calibration. In resistive touch screens, the upper ITO film needs to be thin enough to be flexible so that it can bend downward to contact the lower ITO film.

The functions of button 3 are alarm mute button 3, wireless network setting menu button 3, system setting menu button 3, upper context selection button 3, and lower context selection button 3.

FIG3 is a schematic diagram of the operation of the portable health monitoring device provided by the embodiment of the utility model. As shown in FIG3 , the housing 1 includes: a central processing unit, multiple target microprocessors and a communication module. The central processing unit is connected to the target microprocessor, the input device, the output device and the communication module respectively. The central processing unit receives the monitoring instruction through the input device, controls one or more target microprocessors to work according to the monitoring instruction, and outputs the monitoring data through the communication module and/or the output device.

The central processing unit is used to receive monitoring instructions input by the user through buttons or touch screen, and send the monitoring instructions to the target microprocessor.

In one example, the central processing unit recognizes that the monitoring item in the monitoring instruction is an ECG signal, determines the corresponding ECG target microprocessor according to the ECG signal, and sends the monitoring instruction to the ECG target microprocessor.

In another example, the central processing unit recognizes that the monitoring item in the monitoring instruction is blood oxygen saturation, determines the corresponding blood oxygen target microprocessor according to the blood oxygen saturation, and sends the monitoring instruction to the blood oxygen target microprocessor.

In a possible implementation, the multiple target microcontrollers and central processing unit in the present invention operate independently and communicate via a serial interface.

In one example, the target microcontroller is an MCU chip, and the central processing unit is a Micro Processor main control processor chip.

The target microprocessor is STM32F429IGT6, a high-performance 32-bit microcontroller that uses the ARMCortex-M4 core and features high-speed computing capability, rich peripheral interfaces and low power consumption. It is widely used in industrial automation, smart home and medical equipment. In terms of performance, at 180MHz, when executing from Flash memory, STM32F429 can provide 225DMIPS/608CoreMark performance, and uses STMicroelectronics' ART accelerator to achieve zero wait state for FLASH. DSP instructions and floating-point arithmetic units expand the application range of the product. In terms of power efficiency, STM32F429 uses STMicroelectronics' 90nm process and ART accelerator, with dynamic power adjustment function, which can achieve current consumption as low as 260μA/MHz in operating mode and when executing from Flash memory. In shutdown mode, the typical power consumption is 100μA. In terms of graphics, the new LCD-TFT controller that supports dual layers uses STMicroelectronics' Chrom-ART graphics accelerator, and the content creation speed is twice that of a single core. In addition to raw data copying, the Chrom-ART accelerator also supports other functions, such as image format conversion or image mixing (transparency mixing). In this way, the Chrom-ART accelerator increases the speed of graphic content creation and saves MCU core processing bandwidth for other programs. In terms of audio, it supports dedicated PLL, 2 full-duplex I ² S and 1 new serial audio interface (SAI), and supports time division multiplexing (TDM) mode. At the same time, more interfaces are available, including up to 20 communication interfaces (including 4 USARTs, 4 UARTs with a speed of 11.25Mbit/s, 6 SPIs with a speed of 45Mbit/s, 3 I ² Cs with new optional digital filter functions, 2 CAN and SDIO interfaces). In addition, it has 2 12-bit DACs and 3 12-bit ADCs with a speed of 2.4MSPS or 7.2MSPS (in interleaved mode). There are also up to 17 timers, 16-bit and 32-bit timers with a frequency of up to 180MHz. The memory range can be easily extended using a flexible memory controller that can reach 90MHz through a 32-bit parallel interface and supports Compact Flash, SRAM, PSRAM, NOR, NAND and now SDRAM memories. In addition to the simulated true random number generator that all STM32F4 devices have, the STM32F439 also integrates a crypto/hash processor that provides hardware acceleration for AES-128, -192 and -256, and now supports GCM, CCM, TripleDES and hashing (MD5, SHA-1 and now SHA-2).

The target microcontrollers include ECG microcontroller and blood oxygen microcontroller.

The ECG microcontroller is connected to a plurality of ECG monitoring electrodes, and the blood oxygen microcontroller is connected to a finger-clip type blood oxygen probe.

The portable health monitoring device also includes a differential amplifier circuit, a low-pass active filter, a voltage follower, a first-order low-pass filter, an H-bridge drive circuit, and a constant current source drive circuit.

The finger clip type blood oxygen sensor is connected with the differential amplifier circuit, the low pass active filter, the voltage follower, the first order low pass filter and the blood oxygen microcontroller in sequence. The H bridge driving circuit is connected with the finger clip type blood oxygen sensor and the constant current source driving circuit respectively.

The plurality of ECG monitoring electrodes are 5 ECG monitoring electrodes.

There are five common ECG monitoring electrode locations, namely RA, RL, C, LA and LL. RA is the upper right lead, which is attached to the first intercostal space on the right midclavicular line, that is, the outer and lower part of the midpoint of the right clavicle. RL is the lower right lead, which is attached to the level of the xiphoid process on the right midclavicular line, that is, the sixth intercostal space on the right anterior axillary line. V is the middle lead, which is generally attached to the fourth intercostal space on the left edge of the sternum, under the xiphoid process and slightly to the left precordial area, or the place where the chest lead is monitored clinically. LA is the upper left lead, which is attached to the first intercostal space on the midline of the left clavicle, that is, the outer and lower part of the midpoint of the left clavicle. LL is the lower left lead, which is attached to the level of the xiphoid process on the left midclavicular line, that is, the sixth intercostal space on the left anterior axillary line.

Impedance respiration is the process of measuring the change in chest muscle impedance when a person breathes. The measurement method also comes from the ECG electrodes. A 64KHz carrier frequency is applied to the ECG electrodes. The back stage of the ECG signal amplification circuit extracts the breathing waveform by unpacking and calculates the breathing rate.

ECG signals and impedance respiration signals are weak and susceptible to interference, requiring the use of multi-stage analog amplifier circuits and filter circuits.

The traditional acquisition circuit is built with discrete components, namely, multiple operational amplifier chips, power chips, analog-to-digital conversion chips, and several resistors and capacitors. This way of designing the circuit is complex, large in size, high in cost, and not suitable for portable use.

The utility model uses the integrated chip ADAS1000BSTZ designed by ADI company for five-lead ECG, impedance breathing and pacing pulse monitoring suppression. The chip body is only 10mmX10mm in size, has low power consumption, strong anti-interference ability, and provides SPI interface and MCU communication.

In one example, the audio module is an audio driver chip FM8002A, which is an audio power amplifier suitable for portable electronic products. At 5V voltage, the maximum driving power is 1.5W (8Ω load) and 2.0W (4Ω load). The application circuit of FM8002A is simple and requires only a few peripheral components. The output of FM8002A does not require external coupling capacitors or boost capacitors, and uses SOP8 package, which is very suitable for low-voltage and low-power audio applications. FM8002A can enter sleep mode through control, thereby reducing power consumption. FM8002A eliminates the noise caused by power-on and power-off through innovative "switching/switching noise" suppression technology. FM8002A works stably, with a gain-bandwidth product of up to 2.5MHz, and is stable at unity gain. The voltage gain of the amplifier can be adjusted by configuring peripheral resistors for easy application.

In one example, the display module uses an LCD with a 4.3-inch RGB interface screen and a resolution of 480*800. As the name implies, the RGB interface is based on the three primary colors (red, green, and blue) data signals to achieve data interaction between the CPU and the LCD. There are many working modes for this interface signal, but without exception, multiple data lines are required. Depending on the number of signal lines, the interface can be subdivided into 6-bit, 16-bit, 18-bit, 24-bit and other working modes. The pin definition is usually CS (alias: chip select pin, usually used to select IC) + VSYNC (field synchronization signal, select the effective field signal interval on the liquid crystal) + HSYNC (line synchronization signal, select the effective line signal interval on the liquid crystal) + DE (data enable signal) + data line (R0Rx, G0Gx, B0~Bx, x = actual data/3-1, for example, using 24bit, x. The RGB interface also has advantages and disadvantages. Because the RGB interface occupies more resources, the LCD refresh rate using this interface is very fast, and the software control is relatively simple. And because the display data of this interface does not need to be written into the memory for processing, it can be directly written into the LCD for display, so the response speed and refresh speed are much faster than the MCU interface. The advantages are fast refresh speed, video playback, and simple and convenient operation and control.

In the field of medical health, wireless networking modules can realize data transmission and remote monitoring between medical devices. For example, wireless sensor networks can be used to monitor the physiological parameters of patients and transmit data to medical staff for real-time analysis and processing. The portable health monitoring device of the utility model provides two communication modules, namely WIFI module and 4G network module.

As an important part of wireless communication, WIFI module not only brings us a lot of convenience, but also gives modern communication technology great flexibility. WIFI transmission has the advantages of fast and stable. It not only usually has a fast data transmission speed, but also the speed of WIFI transmission will not be significantly affected even in the presence of interference factors such as distance and obstacles. Compared with other wireless communication technologies, WIFI transmission distance is longer, and it can cover a range of several hundred meters. In modern society, network security issues are increasingly valued, and the risks brought to people by data information leakage or hacker attacks are also increasing. In the WIFI communication module, data transmission is encrypted to ensure the security of data transmission and prevent data leakage and hacker attacks. Therefore, WIFI communication modules are widely used in some important fields, such as finance, government affairs, and medical care. High security is also an important feature of WIFI communication modules, which reflects the superiority of WIFI communication modules in information transmission. WIFI module not only has excellent transmission speed, but also has a large transmission distance. It is also a data transmission solution that can be freely expanded, flexible and convenient. Especially for some uncertain factors, and the need to dynamically adjust data transmission needs. In addition, the WIFI system can also be well integrated with other devices and systems, has strong compatibility and scalability, and can flexibly respond to a variety of needs.

In areas without WIFI network coverage, portable health monitoring devices must consider the problem. The 4G-DTU module is an LTE network standard that supports TD-LTE and FDD-LTE, is compatible with the standardized LTE protocol of mobile phone software, and has the characteristics of fast communication speed, Internet bandwidth, and flexible communication. The 4G-DTU module is a product developed to realize the mutual transmission of data between serial port devices and network servers through the operator network. It is commonly used in industrial automation, shared massage chairs, smart charging piles, telemedicine, etc. It is characterized by fast data transmission, the transmission rate can reach more than 500KB, the data transmission is very reliable, and the anti-interference ability is strong. It is very suitable for some scenarios where the transmission rate is required in time.

In a possible implementation, the portable health monitoring device of the utility model further includes a power module, which includes a lithium battery charging module and a system power supply module.

In one example, the lithium battery charging IC selected is CN3765.

CN3765 is a multi-type battery charging management integrated circuit with PWM buck mode, which can independently manage the charging of multiple batteries, with the advantages of small package size, few peripheral components and simple use. CN3765 has trickle current, constant current and constant voltage charging modes, which is very suitable for lithium battery, lithium iron phosphate battery and lithium titanate battery charging management.

In constant voltage charging mode, CN3765 modulates the battery voltage at the voltage set by the external feedback resistor. In constant current charging mode, the charging current is set by an external resistor. For deeply discharged lithium batteries, when the battery voltage is lower than 66.5% (typical value) of the constant voltage charging voltage, CN3765 uses 17.5% of the set constant current charging current to trickle charge the battery. During the constant voltage charging stage, the charging current gradually decreases, and when the charging current drops to 16% of the constant current charging current, the charging ends. At the end of charging, if the charging current rises to more than 58.8% of the constant current charging current, a new charging cycle will automatically start.

The output voltage of the lithium battery reaches 4.2V when fully charged, and the discharge voltage can drop to 3.7V. In order to ensure the stability of the system power supply, a voltage boost conversion circuit is designed. The current mode DC-DC boost converter, the built-in 0.05Ω power MOSFET PWM circuit makes the converter highly efficient. The internal compensation circuit also reduces up to 6 external devices. The non-inverting input of the error amplifier is connected to a precise 0.6V reference voltage. The internal soft start function can reduce the inrush current. AP2005 is suitable for SOP8-PP package, saving PCB space for application areas.

Linear regulators have the advantages of low cost, low noise, and low quiescent current. Few external components are required, usually only one or two bypass capacitors are needed. The SSP7603P33PR has a voltage input range of 15V, low temperature drift, a maximum output current of 500mV, an ultra-low quiescent current of 1.5μA, and a voltage drop of only 170mV. It is widely used in low-power products.

Data storage is an important component of electronic products. The portable health monitoring device of the utility model also includes a data storage module.

In one example, the utility model uses the W25G01GVZE1G Nandflash. The W25N01GVZE1G flash memory integrates the popular SPI interface and the traditional large NAND non-volatile storage space. They are ideal for mapping code to RAM, executing code directly from Dual/Quad SPI (XIP), and storing voice, text, and data. The device runs on a single 2.7V to 3.6V power supply, with an operating current consumption as low as 25mA and a standby current consumption as low as 10μA. The W25N01GVZEIG1G bit memory array is organized into 65,536 programmable pages of 2,048 bytes each. The entire page can be programmed at once using data from the 2,048-byte internal buffer. Pages can be erased in groups of 64 (128KB block erase). The W25N01GVZEIG has 1,024 erasable blocks. The W25N01GVZEIG supports standard Serial Peripheral Interface (SPI), Dual/Quad I/O SPI: Serial Clock, Chip Select, Serial Data I/O0 (DI), I/O1 (DO), I/O2 (/WP), and I/O3 (/HOLD). SPI clock frequencies up to 104MHz are supported, allowing an equivalent clock rate of 208MHz (104MHz x 2) for dual I/O and 416MHz (104MHz x 4) for quad I/O when using the Fast Read Dual/Quad I/O instruction. The W25N01GVZEIG offers a new continuous read mode that can efficiently access the entire memory array with a single read command. This feature is ideal for code shadowing applications. A hold pin, write protect pin, and programmable write protection provide further control flexibility. In addition, the device supports JEDEC standard manufacturer and device IDs, a 2,048-byte unique ID page, a 2,048-byte parameter page, and ten 2,048-byte OTP pages. Provides better NAND Flash memory manageability, user-configurable internal ECC, bad block management.

FIG4 is a schematic diagram of the structure of the blood oxygen monitoring device provided by the embodiment of the utility model, and FIG5 is a schematic diagram of the circuit structure of the blood oxygen monitoring device provided by the embodiment of the utility model. As shown in FIG4 and FIG5, the blood oxygen monitoring device includes: a finger-clip blood oxygen probe, a differential amplifier circuit, a low-pass active filter, a voltage follower, a first-order low-pass filter, an H-bridge drive circuit, and a constant current source drive circuit. As shown in FIG5, the circuit structure of the blood oxygen monitoring device is divided into three levels. The first level is a differential amplifier circuit composed of three operational amplifiers U1B, U1C, and U1E, which has high input impedance, high common mode rejection ratio, low noise, and low drift; the photoelectric pulse signal belongs to an extremely weak electrical signal, and the differential amplifier can effectively amplify the useful signal and suppress interference noise; the second level is U1D, a forward input amplifier, which further amplifies the pulse wave signal; the third level is U3C, and the voltage follower acts as a voltage buffer, isolation, and improves the load driving capacity; R34 and C47 are low-pass filters, and the ADC position is connected to the blood oxygen microcontroller MCU for signal transmission.

The finger clip type blood oxygen sensor, the differential amplifier circuit, the low pass active filter, the voltage follower, the first order low pass filter and the blood oxygen microcontroller are connected in sequence. The H bridge driving circuit is connected to the finger clip type blood oxygen sensor and the constant current source driving circuit respectively.

The blood oxygen saturation SPO2, pulse rate and perfusion index are measured by using a finger clip blood oxygen probe to clamp the finger or toe to collect the pulse wave signal.

The finger clip type blood oxygen sensor consists of a red light emitting diode, an infrared light emitting diode and a photosensitive diode. The oxygenated hemoglobin (HbO2) and reduced hemoglobin (Hb) in human blood absorb red light and infrared light to different extents. The Lambert-Beer law can be used to calculate SPO2 (oxygen saturation). The red light and infrared light in the finger clip type blood oxygen sensor are alternately irradiated to the skin and penetrate the fingers. The photosensitive diode receives the light signal and converts it into a weak current signal. After amplification and filtering by the operational amplifier, the pulse wave signal of red light and infrared light can be extracted. The pulse wave voltage amplitude of different light sources is proportional (oxygenated hemoglobin (HbO2) and reduced hemoglobin (Hb) absorb red light and infrared light to different extents). The period of the pulse wave is the pulse rate, and the amplitude of the pulse wave represents the perfusion index.

The central processing unit is a portable data processing center, which is mainly responsible for receiving physiological signal measurement results, providing human-computer interaction interface display, input, output, alarm, storage and data exchange, etc.

Among them, the finger-clip blood oxygen probe is used to collect the pulse wave signal of the monitored object.

The differential amplifier circuit is used to convert the current signal of the photodiode in the finger-clip type blood oxygen sensor into a voltage signal and an amplified signal.

The differential amplifier circuit is a mutual resistance amplifier circuit, which converts the dark current of the photodiode into a voltage signal. The mutual resistance amplifier has the advantages of good high-frequency characteristics, strong stability, wide operating frequency range, low noise, etc., and is more suitable for use in portable devices.

Low-pass active filter is used to filter out high-frequency noise of voltage signals and amplify signals to improve signal-to-noise ratio.

Voltage follower is used for buffering and isolating voltage signals and amplified signals to improve load-driving capacity.

A first-order low-pass filter is used to further filter out the noise of the voltage signal and the amplified signal.

The H-bridge driving circuit is used to control the red light emitting diode and the infrared light emitting diode in the finger clip type blood oxygen sensor to light up and turn off alternately.

The constant current source driving circuit is used to control the brightness of the red light emitting diode and the infrared light emitting diode.

The blood oxygen microcontroller is used to realize analog-to-digital conversion and digital filtering, and sends the collected data such as blood oxygen saturation SPO2, pulse rate and perfusion index to the central processor through the serial interface.

The portable health monitoring device provided by the utility model has two modes: data storage and remote real-time monitoring. Patients can communicate with medical staff according to their actual situation to monitor their vital signs. Currently, most ECG monitors used for home monitoring are 3-lead, while the utility model uses 5-lead, which can more accurately collect the patient's vital sign-related data and reflect more vital sign-related data of the patient.

The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims (10)

1. A portable health monitoring device, characterized in that it includes: a housing, a display screen, buttons, a speaker, a power indicator light, a power switch, and a card slot; The display screen, buttons, and power indicator light are arranged on the front of the housing; the power switch and the card slot are arranged on the side of the housing; The top of the housing includes two wire connection ports, one of which is connected to a plurality of ECG monitoring electrodes via wires, and the other is connected to a finger-clip type blood oxygen sensor via wires; The shell is provided with a central processing unit, a target microprocessor and a communication module; the central processing unit is respectively connected with the target microprocessor, the communication module, the display screen, the buttons, the speaker, the power indicator light, the power switch and the card slot; the target microprocessor is connected with the two wire connection ports. 2. The portable health monitoring device according to claim 1, characterized in that the wire connection port also includes a wire clamping slot for fixing the wire. 3. The portable health monitoring device according to claim 1, characterized in that the housing further comprises a positioning module; The positioning module is connected to the central processing unit and is used to obtain position information. 4. The portable health monitoring device according to claim 1, characterized in that an environmental sensor is also provided on the housing; The environmental sensor is connected to the central processing unit and is used to obtain environmental information; The environment sensor includes at least one of a brightness sensor and a sound sensor. 5. The portable health monitoring device according to claim 1, characterized in that the housing further comprises a data storage module; The data storage module is connected to the central processing unit and is used for storing data. 6. The portable health monitoring device according to claim 1, characterized in that the housing further comprises a power module; The power supply module is connected to the central processing unit and is used for providing power. 7. The portable health monitoring device according to claim 1, characterized in that the target microprocessor includes an electrocardiogram microcontroller and a blood oxygen microcontroller; The electrocardiogram microcontroller is connected to the plurality of electrocardiogram monitoring electrodes; the blood oxygen microcontroller is connected to the finger-clip type blood oxygen probe. 8. The portable health monitoring device according to claim 7, characterized in that it also includes a differential amplifier circuit, a low-pass active filter, a voltage follower, a first-order low-pass filter, an H-bridge drive circuit, and a constant current source drive circuit; The finger-clip blood oxygen sensor is connected to a differential amplifier circuit, a low-pass active filter, a voltage follower, a first-order low-pass filter, and a blood oxygen microcontroller in sequence; the H-bridge drive circuit is connected to the finger-clip blood oxygen sensor and a constant current source drive circuit respectively. 9 . The portable health monitoring device according to claim 1 , wherein the display screen is a touch screen. 10 . The portable health monitoring device according to claim 1 , wherein the plurality of ECG monitoring electrodes are 5 ECG monitoring electrodes.