CN113100729A

CN113100729A - Blood pressure measuring device based on intelligent cuff

Info

Publication number: CN113100729A
Application number: CN202110425216.2A
Authority: CN
Inventors: 武晓龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2021-07-13

Abstract

The invention discloses a blood pressure measuring device based on an intelligent cuff, which comprises components such as (1) an outer cuff layer, (2) an inner airbag, (3) a flexible integrated circuit board, (4) a pressure ball, and (5) a limit ring. Wherein (3) the sensor component part of the flexible integrated circuit board is arranged in the inner layer air bag of (2); (3) the power module part of the flexible integrated circuit board is arranged outside the inner layer air bag (2) so as to be convenient for replacing batteries or charging. (3) The flexible integrated circuit board is composed of a (16) MCU controller, a (11) pressure sensor, an (12) acceleration sensor, a (13) microphone sensor, a (14) acquisition module, a (15) power module, a (17) transmission module and other components, blood pressure is measured by collecting air pressure and pulse sound data in the cuff and adopting a method combining a Korotkoff sound method and an oscillography, and the measured data is transmitted to terminal equipment by Bluetooth or WIFI or other wireless/wired methods, wherein the terminal equipment comprises but is not limited to (18) mobile phones, tablets, computers and the like. The current pressure value and the blood pressure result are displayed in real time through the terminal equipment, and the pulse beating sound can be played for judging by the Korotkoff sound method. The intelligent appearance of the device is the same as that of a common cuff, the device is convenient to carry, and the device can replace the traditional mercury sphygmomanometer and an electronic sphygmomanometer.

Description

Blood pressure measuring device based on intelligent cuff

Technical Field

The invention relates to the technical field of medical instruments, in particular to a blood pressure measuring device based on an intelligent cuff.

Background

Non-invasive blood pressure measurement methods mainly include korotkoff sound method and oscillometric method. The cuff is based on an inflatable air bag, the arterial blood flow of the limb is blocked by first pressurizing, then the cuff is slowly deflated, the blocked arterial blood flow is reopened, and the Korotkoff sounds or pulse oscillation signals in the cuff are detected, so that the measurement of the systolic pressure, the diastolic pressure, the average pressure and the pulse rate of the human body is realized. The classical representation of the korotkoff sound method is a mercury meter and the classical representation of the oscillometric method is an electronic sphygmomanometer.

The mercury sphygmomanometer is one of korotkoff's sound sphygmomanometer, and is a sphygmomanometer mainly constructed by mercury, which was born in the uk in 1928. The earliest blood pressure meters were used to measure the blood pressure of horses and then to measure the blood pressure of the human body. From 8/16/2017, the "water guarantee for mercury" was in effect in China, wherein it was clearly stated that "from 1/2026, the production of mercury-containing thermometers and mercury-containing blood pressure meters was prohibited. There is therefore a need for an alternative pressure measurement to mercury gauges. In addition, the korotkoff sound method needs to be operated by trained professional medical personnel for blood pressure measurement, is not favorable for the user to carry out the self-measurement of blood pressure at home, is easily disturbed by external noise in the measurement process, and the accuracy of measuring result is closely related to the measurement operator, has the error on the subjective factor.

For the electronic sphygmomanometer based on the oscillometric method to measure the blood pressure, compared with the auscultatory method, the sensitivity of the oscillation wave detected in the cuff is stronger, the electronic sphygmomanometer is not easily influenced by the surrounding noise, the home blood pressure measurement and the dynamic blood pressure measurement and monitoring of the user can be realized, but the following problems still exist: (1) the pulse oscillation wave is easily influenced by slight movement of limbs, needs to be kept in a relatively static state in the measurement process, but cannot be completely ensured to completely meet the measurement condition, and the deviation of the measurement result is large; (2) for the arrhythmia patients with frequent premature beat or atrial fibrillation, the intensity of the oscillatory wave signals generated by each beat in the sleeve belt is different due to different intensity of the blood pump of each heart, so that the intensity does not strictly accord with the process that the detected oscillatory wave signals are increased from small to large and then are reduced to a certain degree in the deflation process, and the error of the blood pressure measurement of the patients with frequent premature beat or atrial fibrillation is larger.

Disclosure of Invention

The invention provides a blood pressure measuring device based on an intelligent cuff, which is used for solving the technical defects of the existing Korotkoff sound method or oscillometric method for measuring blood pressure, reducing the interference of external noise on the Korotkoff sound method and the influence caused by limb movement in the measuring process of the oscillometric method, accurately positioning the pressure in the cuff corresponding to the moment when the measured arterial blood pressure appears and improving the measuring accuracy.

One application method of the invention is a pressure measuring method based on an oscillometric method, compared with the common electronic sphygmomanometer, the biggest difference is that the pressure sensor is directly arranged in the inner air bag, the bulky sphygmomanometer shell is removed, the appearance structure is the same as that of the common cuff, and the sphygmomanometer is convenient for a user to carry.

One of the application methods of the present invention is a method for replacing a mercury sphygmomanometer, compared with "a semi-automatic sphygmomanometer replacing a mercury sphygmomanometer" (application No. CN 201721307418.2): firstly, a stethoscope does not need to be matched, a microphone sensor is arranged in an air bag, sound signals of pulse fluctuation are collected, and the sound signals are played through terminal equipment; the invention supports both the method of manually marking the blood pressure value and the automatic marking of the blood pressure value through an intelligent algorithm.

In order to achieve the above object, the present invention provides a blood pressure measuring device for measuring arterial blood pressure through a limb of a subject, the measuring device comprising components as shown in fig. 3.‏ a terminal device connected with the acquisition module in wired or wireless manner for displaying current pressure value, pulse wave and playing pulse sound;

the measurement device performs a blood pressure measurement process including the steps of:

s1, connecting the terminal equipment with the intelligent cuff;

s2, pressing the pressure ball to inflate the cuff, wherein in the inflation process, the MCU controller starts to acquire data of the pressure sensor and transmits the data to the terminal equipment, the terminal equipment judges whether the inflation is continued according to pulse waveform data acquired by the pressure sensor, when the pressure is greater than the systolic pressure of a human body and the pulse waveform approaches, the pressure in the cuff airbag exceeds the systolic pressure of the measured artery, the blood flow in the measured artery is blocked, the pressurization of the cuff airbag is stopped at the moment, the pressure ball control valve is opened at the same time to control the cuff airbag to deflate, the terminal equipment displays the deflation speed, the speed is prompted to be too fast or too slow, and the deflation speed is controlled within a reasonable range

S3, synchronously acquiring pressure data and pulse wave data of the pressure sensor in the constant-speed deflation process of the cuff air bag, and determining the systolic pressure SBP1 of the artery to be detected according to the air pressure in the cuff air bag when the pressure sensor detects that the pulse wave signal in the cuff air bag changes from a weak position to a strong position;

s4, determining the average pressure MAP1 of the artery to be detected according to the air pressure in the cuff air bag when the pressure sensor detects that the pulse wave signal in the cuff air bag is changed from the rising edge to the falling edge;

and S5, determining the diastolic pressure DBP1 of the artery to be detected according to the air pressure in the cuff air bag when the pressure sensor detects that the pulse wave signal in the cuff air bag changes from a stronger position to a weaker position suddenly.

Further, during the constant-speed deflation process of the cuff air bag, the pulse beating sound collected by the microphone sensor can be viewed and listened through the terminal equipment, and when the pulse sound is from no or weak to obviously larger, the air pressure in the cuff air bag determines the corrected value SBP2 of the systolic pressure of the measured artery.

Furthermore, during the constant-speed deflation of the cuff air bag, the pulse beat sound collected by the microphone sensor can be viewed and listened through the terminal equipment, and the corrected value MAP2 of the average pressure of the measured artery is determined according to the air pressure in the cuff air bag when the pulse sound is changed from gradual increase to gradual decrease.

Furthermore, in the process of constant-speed deflation of the cuff air bag, the pulse beating sound collected by the microphone sensor can be viewed and listened through the terminal equipment, when the tone of the audio signal is changed and gradually disappears, the air pressure in the cuff air bag at the tone moment is changed, and the corrected value DBP2 of the diastolic pressure of the measured artery is determined.

Furthermore, in the process of uniform-speed deflation of the cuff air bag, the limb activity signals acquired by the acceleration sensor can be checked through the terminal equipment, when the signal intensity exceeds a specific threshold value, the excessive limb activity of the measured artery can be determined, and the pressure value of the pressure sensor and the pulse wave signals in the period of time are filtered to remove the influence on the measurement result.

Furthermore, the actual measured limb blood pressure value can be comprehensively calculated according to the systolic pressure SBP1, the average pressure MAP1 and the diastolic pressure DBP1 obtained by the pressure sensors in the measurement process, and the systolic pressure SBP2, the average pressure MAP2 and the diastolic pressure DBP2 obtained by the microphone sensors.

Furthermore, according to the pulse wave signals detected by the pressure sensor in the deflation process, the interval of adjacent pulse wave signals is calculated, the average avgRR is solved, and then the average avgRR is converted into a pulse/minute mode, namely the pulse rate value, and the formula is as follows: PR =60 SR/avgRR, where SR is the system sampling rate.

The invention has the beneficial effects that:

(1) the blood pressure measuring device integrates the flexible low-power-consumption circuit board and the power supply in the cuff, adopts external terminal equipment including but not limited to mobile phones, tablets, computers and other equipment, particularly popularizes mobile phone terminals, can realize calculation and display of measuring results by means of strong data processing capacity and a display screen, greatly reduces the weight and the volume relative to a mercury meter and a common electronic sphygmomanometer, is convenient to carry, and can measure blood pressure at any time and any place.

(2) The blood pressure measuring device can synchronously acquire pulse beating audio frequency of a Korotkoff sound method and pulse waveform data of an oscillometric method, synchronously transmit the data to the terminal equipment through the transmission module for processing, displaying and sound playing, is equivalent to simultaneously using the mercury sphygmomanometer and a common electronic sphygmomanometer to measure a measured person, and can mutually verify the obtained two data, thereby greatly improving the measuring accuracy.

(3) The blood pressure measuring device synchronously collects the data of the acceleration sensor, and can filter invalid data generated by limb movement in the measuring process, thereby further improving the measuring accuracy. ‏

Drawings

FIG. 1 is a component of one embodiment of the present invention;

FIG. 2 is a block diagram of an embedded system of one embodiment of the present invention;

FIG. 3 is a block diagram of a system architecture of one embodiment of the present invention;

FIG. 4 is a block diagram of an external power supply according to one embodiment of the invention;

FIG. 5 is a block diagram of a built-in power supply of one embodiment of the present invention;

the reference numbers illustrate: the cuff comprises an outer layer 1 of a cuff, an inner layer air bag 2, a flexible integrated circuit board 3, a pressure ball 4, a limit ring 5, a pressure sensor 11, an acceleration sensor 12, a microphone sensor 13, an acquisition module 14, a power supply module 15, an MCU (microprogrammed control Unit) controller 16, a transmission module 17, a terminal device 18, an intelligent cuff 21, a charge and discharge master control 22, a device terminal 23, an internal air bag 31, a flexible integrated circuit board 32, a power supply positive and negative electrode contact 33 and a rechargeable thin film battery 34. ‏

Detailed Description

The invention is further described below with reference to the accompanying drawings. ‏

The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in figure 3, the blood pressure measuring device based on the intelligent cuff comprises a cuff (21) implanted with a flexible integrated circuit board, an inflation and deflation master controller (22) and a terminal device (23).

As shown in fig. 2, the blood pressure measuring device based on the intelligent cuff of the invention is an implanted flexible integrated circuit board and consists of a (11) pressure sensor, a (12) acceleration sensor, a (13) microphone sensor, a (14) acquisition module, a (17) transmission module, a (15) power supply module and a (16) MCU controller.

The measuring device inflates the air bag in the cuff through a pressure ball; the pressure sensor detects the pressure value and the pulse wave in the air bag; the microphone sensor detects pulse beating audio signals, the acceleration sensor is used for detecting limb movement, and the limit ring on the pressure ball is used for controlling the air bag to deflate at a constant speed; through comprehensive analysis and calculation of pulse waves and pulse beating audio, interference signals detected by an acceleration sensor are eliminated, and systolic pressure, average pressure and diastolic pressure of an artery are accurately calculated; the MCU controller realizes the acquisition and transmission of various signals and the calculation of systolic pressure, diastolic pressure, average pressure and pulse rate, and sends the measured data and results to the terminal module for display and audio playing through the transmission module.

The measurement device performs a blood pressure measurement process including the steps of: step one, connecting the terminal equipment with the intelligent cuff; and step two, pressing the pressure ball to inflate the cuff to a pressure value larger than the systolic pressure of a common person, and then the MCU controller starts to receive the collected data of the pressure sensor, the microphone sensor and the acceleration sensor and transmit the data to the terminal equipment. ‏, checking the pressure value and pulse waveform displayed by the terminal until no pulse wave is detected at a pulse interval of more than 3 times or more than 2 seconds, which indicates that the pressure in the cuff air bag exceeds the systolic pressure of the measured artery and the blood flow in the measured artery is blocked, at this moment, stopping pressurizing the cuff air bag, and simultaneously opening the pressure ball control valve to control the cuff air bag to deflate at a constant speed.

As shown in fig. 2, the method for measuring systolic pressure, diastolic pressure, mean pressure and pulse rate of an artery using the blood pressure measuring device of the present invention comprises the steps of:

(1) calculating systolic pressure: synchronously acquiring pressure data and pulse wave data in the constant-speed deflation process of the cuff air bag, and determining the systolic pressure SBP1 of the artery to be detected according to the air pressure in the cuff air bag when the pressure sensor detects that the pulse wave signal in the cuff air bag changes from a weak position to a strong position;

(2) calculation of average pressure: determining the average pressure MAP1 of the artery to be detected according to the air pressure in the air bag when the pressure sensor detects that the pulse wave signal in the cuff air bag is changed from the rising edge to the falling edge;

(3) calculation of diastolic pressure: determining the diastolic pressure DBP1 of the artery to be detected according to the air pressure in the cuff air bag when the pressure sensor detects that the pulse wave signal in the cuff air bag suddenly changes from a stronger position to a weaker position;

(4) calculating a corrected systolic pressure value: in the constant-speed deflation process of the cuff air bag, the pulse beating sound collected by the microphone sensor can be checked and listened through the terminal equipment, and when the pulse sound is obviously increased, the air pressure in the cuff air bag determines the corrected value SBP2 of the systolic pressure of the measured artery;

(5) calculating a corrected value of the average pressure: in the constant-speed deflation process of the cuff air bag, the pulse beating sound collected by the microphone sensor can be checked and listened through the terminal equipment, and when the pulse sound is changed from gradual enhancement to gradual weakening, the air pressure in the cuff air bag determines the corrected value MAP2 of the average pressure of the measured artery;

(6) calculating a diastolic pressure correction value: in the constant-speed deflation process of the cuff air bag, the pulse beating sound collected by the microphone sensor can be checked and listened through the terminal equipment, when the pulse sound changes and gradually disappears, the corrected value DBP2 of the diastolic pressure of the measured artery is determined according to the air pressure in the cuff air bag at the moment of changing the tone. ‏

(7) Removing interference data: in the process of constant-speed deflation of the cuff airbag, the limb activity signals acquired by the acceleration sensor can be checked through the terminal equipment, when the signal intensity exceeds a specific threshold value, the excessive limb activity of the measured artery can be determined, and the pressure value of the pressure sensor and the pulse wave signals in the time period are filtered to remove the influence on the measurement result;

(8) calculation of blood pressure values after correction: according to the systolic pressure SBP1, the average pressure MAP1 and the diastolic pressure DBP1 obtained by the pressure sensors in the measurement process, and the systolic pressure correction value SBP2, the average pressure correction value MAP2 and the diastolic pressure correction value DBP2 obtained by the microphone sensors, the interference condition of each position point is judged by combining the data of acceleration, and the actual measured limb blood pressure value can be comprehensively calculated.

(9) Calculating a pulse rate value: according to the pulse wave signals detected by the pressure sensor in the deflation process, the interval of adjacent pulse wave signals is calculated, the average avgRR is solved, and then the average avgRR is converted into a pulse/minute mode, namely a pulse rate value, wherein the formula is as follows: PR =60 SR/avgRR, where SR is the system sampling rate.

The power supply scheme of the invention has 2 designs, and the 1 st is as shown in figure 4, the flexible integrated circuit board implanted into the internal air bag does not comprise a battery part, but is connected with a button battery through contacts in a mode of exposing positive and negative contacts (33) of the circuit board. ‏ As shown in fig. 5, the flexible IC board implanted in the inner air bag contains a (34) rechargeable thin film battery, and then exposes the positive and negative contacts (33) of the circuit board of fig. 3, and connects with a USB interface for charging.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. For example, the flexible circuit board and the components of the blood pressure measuring device in the embodiment of the invention, and the terminal equipment can be selected, replaced and omitted according to actual needs. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims

1. A blood pressure measuring device based on an intelligent cuff comprises components such as (1) an outer layer of the cuff, (2) an inner layer air bag, (3) a flexible integrated circuit board, (4) a pressure ball and (5) a limit ring, and the like, wherein the measuring device is used for measuring arterial blood pressure through any upper limb of a measured person and is characterized in that the flexible integrated circuit board is implanted into a common cuff, so that an oscillometric and Korotkoff sound method dual pressure measuring method can be realized;

the appearance structure of the intelligent cuff is simpler than that of a common electronic sphygmomanometer, and only one cuff device, one pressure ball (4) for inflation and one limit ring (5) for controlling the deflation speed are reserved;

compared with a mercury sphygmomanometer in appearance and structure, the intelligent cuff eliminates parts such as the mercury sphygmomanometer and a receiver, is replaced by a mobile phone and other terminals, is safer and more reliable after the intelligent cuff is free of mercury, and effectively solves the problem of mercury pollution;

the flexible integrated circuit board comprises the following components:

a pressure sensor (11) for converting pressure data of the air pressure of the bladder in the cuff into an analog signal;

an acceleration sensor (12) for acquiring signals of the movement of the limb;

a microphone sensor (13) for converting pulse beat sounds into analog signals;

an acquisition module (14) for acquiring data of all signals;

a power module (15) for providing power to the other modules;

an MCU controller (16) for controlling the other modules to work cooperatively;

a transmission module (17) for transmitting the acquired data to the terminal device;

and the (18) terminal equipment and the (16) MCU controller transmit data in a wired or wireless mode and are used for displaying information such as a current pressure value, a pulse wave, a played pulse sound, a pressure measurement result and the like.

2. The intelligent cuff-based blood pressure measuring device as recited in claim 1, wherein the measuring device performs a blood pressure measuring process comprising the steps of:

s1, connecting the terminal equipment with the intelligent cuff;

s2, pressing the pressure ball to inflate the cuff, wherein in the inflation process, the MCU controller starts to acquire data of the pressure sensor and transmits the data to the terminal equipment, the terminal equipment judges whether the inflation is continued according to pulse waveform data acquired by the pressure sensor, when the pressure is greater than the systolic pressure of a human body and the pulse waveform approaches zero, the pressure in the cuff airbag exceeds the systolic pressure of the measured artery, the blood flow in the measured artery is blocked, the pressurization of the cuff airbag is stopped at the moment, the pressure ball control valve is opened at the same time, the cuff airbag is controlled to deflate at a constant speed, the terminal equipment displays the deflation speed, the speed is prompted when the speed is too fast or too slow, and the deflation speed is controlled within a reasonable range;

3. The intelligent cuff-based blood pressure measuring device according to claim 1 or 2, wherein during the constant-speed deflation of the cuff air bag, the pulse beat sound collected by the microphone sensor can be viewed and listened to through the terminal equipment, and when the pulse sound becomes significantly larger, the air pressure in the cuff air bag determines the corrected value SBP2 of the systolic pressure of the measured artery; in the constant-speed deflation process of the cuff air bag, the pulse sound collected by the microphone sensor can be checked and listened through the terminal equipment, and when the pulse sound is changed from gradual increase to gradual decrease, the air pressure in the cuff air bag determines the corrected value MAP2 of the average pressure of the measured artery; in the process of constant-speed deflation of the cuff air bag, the pulse sound collected by the microphone sensor can be checked and listened through the terminal equipment, when the pulse sound changes and gradually disappears, the air pressure in the cuff air bag at the moment of changing the tone determines the corrected value DBP2 of the diastolic pressure of the measured artery.

4. The intelligent cuff-based blood pressure measuring device as claimed in claim 2 or 3, wherein during the constant-speed deflation of the cuff air bag, the limb activity signal collected by the acceleration sensor can be viewed through the terminal device, when the signal intensity exceeds a specific threshold, the limb activity of the artery to be measured can be determined to be excessive, and the pressure value of the pressure sensor and the pulse wave signal in the period of time are filtered to remove the influence on the measurement result.

5. The intelligent cuff-based blood pressure measuring device as recited in claim 2 or 3, wherein the actual measured limb blood pressure value can be estimated comprehensively by judging the interference condition of each position point according to the systolic pressure SBP1, the average pressure MAP1 and the diastolic pressure DBP1 obtained by the pressure sensors during measurement and the systolic pressure correction value SBP2, the average pressure correction value MAP2 and the diastolic pressure correction value DBP2 obtained by the microphone sensors and combining the data of acceleration.

6. The intelligent cuff-based blood pressure measuring device as claimed in claim 1, wherein the interval between adjacent pulse wave signals is calculated according to the pulse wave signals detected by the pressure sensor during deflation, avgRR is averaged, and then converted into pulse/minute mode, i.e. pulse rate value, as follows: PR =60 SR/avgRR, where SR is the system sampling rate.