Blood pressure measurement device and method having korotkoff sound recognition and playback functions

Abstract

The present disclosure relates to the technical field of blood pressure measurement. Disclosed are a blood pressure measurement device and method having Korotkoff sound recognition and playback functions. The blood pressure measurement device comprises an air pressure sensor, a vibration sensor, and a control module. The air pressure sensor is configured for collecting a pressure analog signal, and the pressure analog signal is configured for characterizing the air pressure within a cuff. The vibration sensor is configured for acquiring a brachial artery pulsation signal. The control module is configured for controlling the air pressure in the cuff and identifying a Korotkoff sound from the brachial artery pulsation signal, and obtaining systolic blood pressure data and diastolic blood pressure data according to the Korotkoff sound and the air pressure. The control module is also configured for responding to a playback operation, playing back the cuff deflation process and the process from appearance to disappearance of the Korotkoff sound, and displaying a blood pressure value, so that a user can analyze the Korotkoff sound to verify the accuracy of a blood pressure measurement result.

Description

Blood pressure measuring device and method with kelly sound recognition and playback function

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 202411391161.8, filed on September 30, 2024, Chinese Patent Application No. 202411886084.3, filed on December 19, 2024, and U.S. Patent Application No. US19 / 210,344, filed on May 16, 2025, and incorporates by reference the entire disclosures of the above patent applications as part of this application. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of blood pressure measurement, in particular to a blood pressure measuring device, method and electronic device, and more particularly to a sphygmomanometer with kelly sound recognition and playback function. BACKGROUND

[0004] Blood pressure can provide a basis for the diagnosis of some diseases (such as kidney disease, endocrine disease, or heart disease, etc.). The process of blood pressure measurement based on kelly sound method is generally as follows: a stethoscope is placed under the air bag of the cuff and tightly attached to the skin, the air bag is pressurized, and when the air pressure in the air bag reaches a certain pressure value, the blood flow of the upper arm artery is blocked, then the gas in the air bag is released, the pressure is slowly lowered, the pressure value corresponding to the first sound kelly sound is determined as the high pressure value, and the pressure value corresponding to the last sound kelly sound is determined as the low pressure value.

[0005] In the above blood pressure measurement process, the identification of kelly sound depends on the hearing and subjective judgment of medical personnel, and is also easily affected by environmental noise, which may cause deviation in the blood pressure value finally determined by medical personnel, affecting the accuracy of blood pressure measurement. SUMMARY

[0006] Therefore, the present disclosure provides a blood pressure measuring device and method with kelly sound recognition and playback function, which accurately identifies blood pressure value through kelly sound and effectively verifies blood pressure value through playback of kelly sound, so as to improve the problem of low accuracy of blood pressure measurement.

[0007] In a first aspect, the disclosure provides a blood pressure measuring device with Korotkoff sound recognition and playback function, the blood pressure measuring device comprising a control module, an air pressure sensor and a vibration sensor; the air pressure sensor is used to collect a pressure analog signal, the pressure analog signal is used to represent the air pressure in the air bag; the vibration sensor is fixed in the cuff and is used to collect the brachial artery pulsation signal; the control module is used to control the air pressure in the air bag and recognize the Korotkoff sound in the brachial artery pulsation signal collected by the vibration sensor, and obtain the systolic pressure data and diastolic pressure data according to the Korotkoff sound and the air pressure in the air bag; and the control module is also used to respond to the playback operation to play back and display the air pressure drop process in the air bag, the occurrence of the Korotkoff sound until the end process, and the systolic pressure data and diastolic pressure data.

[0008] The vibration sensor is a piezoelectric sensor or a microphone.

[0009] The playback of the air pressure drop process in the air bag is through digital display, and the playback of the occurrence of the Korotkoff sound until the end process is through sound player playback and / or through the jumping of the heartbeat graphic symbol on the display screen.

[0010] The control module is also used to send the Korotkoff sound, the air pressure in the air bag, and the systolic pressure data and diastolic pressure data, the corresponding measurement time as the associated blood pressure measurement data to an external device for storage and playback. During the playback operation, the blood pressure measurement data to be played back can be selected for the playback operation.

[0011] The blood pressure measuring device provided in the embodiment stores the Korotkoff sound recognized in the blood pressure measurement process, the air pressure in the air bag during the pressure reduction process, the systolic pressure and diastolic pressure obtained based on the Korotkoff sound recognition, and the measurement time, and synchronously plays back the recognized Korotkoff sound, air pressure, and displays the systolic pressure and diastolic pressure in response to the playback operation, thereby providing the user with the original measurement data of the blood pressure measurement, verifying whether the blood pressure measurement result is accurate by listening to or observing the played back Korotkoff sound, and improving the accuracy of the blood pressure measurement result.

[0012] In a second aspect, the disclosure provides a blood pressure measuring device, the blood pressure measuring device comprising an air pressure sensor, a piezoelectric sensor and a control module;

[0013] The air pressure sensor is used to collect a pressure analog signal, the pressure analog signal is used to represent the air pressure in the air bag;

[0014] The piezoelectric sensor is fixed in the cuff and is used to collect the brachial artery pulsation signal;

[0015] The control module is used for acquiring the pressure simulation signal and the brachial artery pulse signal, identifying the Korotkoff sound signal from the brachial artery pulse signal, obtaining Korotkoff sound data from the Korotkoff sound signal, processing the pressure simulation signal and the Korotkoff sound signal to obtain blood pressure data, and obtaining the air pressure in the air bag during the air bag pressure reduction process and the blood pressure value from the blood pressure data, wherein the blood pressure value is the systolic pressure and the diastolic pressure. The control module is also used for synchronously playing back the Korotkoff sound and the air pressure and simultaneously displaying the blood pressure value in response to a playback operation. The air pressure sensor and the piezoelectric sensor are in communication connection with the control module.

[0016] The blood pressure measuring device provided in the embodiment can accurately identify the Korotkoff sound signal from the brachial artery pulse signal, accurately determine the Korotkoff sound data and the blood pressure data corresponding to the Korotkoff sound data, synchronously play back the Korotkoff sound and the air pressure and simultaneously display the systolic pressure and the diastolic pressure in response to a playback operation, provide original measurement data for determining the blood pressure value, and help improve the accuracy of blood pressure measurement.

[0017] In a third aspect, the disclosure provides a blood pressure measurement method with Korotkoff sound identification and playback functions, which comprises:

[0018] acquiring a pressure simulation signal and a brachial artery pulse signal during an air pressure reduction process in an air bag;

[0019] identifying the Korotkoff sound signal from the brachial artery pulse signal;

[0020] processing the pressure simulation signal to obtain the air pressure during the air pressure reduction process in the air bag;

[0021] processing the pressure simulation signal and the Korotkoff sound signal to obtain the systolic pressure data and the diastolic pressure data;

[0022] synchronously playing back the air pressure reduction process in the air bag, the appearance and ending process of the Korotkoff sound, and displaying the systolic pressure data and the diastolic pressure data in response to a playback operation.

[0023] In a fourth aspect, the disclosure further provides a blood pressure measurement method, which comprises:

[0024] acquiring a pressure simulation signal and a brachial artery pulse signal;

[0025] identifying the Korotkoff sound signal from the brachial artery pulse signal and obtaining Korotkoff sound data from the Korotkoff sound signal;

[0026] processing the pressure simulation signal and the Korotkoff sound signal to obtain blood pressure data, wherein the blood pressure data comprises the air pressure during the air bag pressure reduction process and a blood pressure value, and the blood pressure value is the systolic pressure and the diastolic pressure;

[0027] In response to a playback operation, the Korotkoff sound data and the air pressure data are synchronously played back and the blood pressure value is displayed.

[0028] The blood pressure measurement method provided in the embodiment identifies the Korotkoff sound signal based on the brachial artery pulsation signal, obtains the blood pressure data based on the Korotkoff sound signal and the pressure simulation signal of the air bag, identifies the air pressure corresponding to the occurrence of the Korotkoff sound as the systolic pressure and the air pressure corresponding to the disappearance of the Korotkoff sound as the diastolic pressure, ensures the accuracy of the measurement result, and establishes the association of the Korotkoff sound, the blood pressure data and the measurement time in the measurement process as the blood pressure measurement data, in response to a playback operation, synchronously plays back the air pressure in the Korotkoff sound and the air bag pressure reduction process and displays the systolic pressure when the Korotkoff sound occurs and the diastolic pressure when the Korotkoff sound disappears, and facilitates the user to verify whether the blood pressure measurement is accurate according to the process from the occurrence to the disappearance of the Korotkoff sound.

[0029] In a fifth aspect, the present disclosure provides an electronic device, comprising a memory and a processor, the memory and the processor are communicatively connected with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method of the third aspect or the fourth aspect or any of the corresponding embodiments thereof. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the specific embodiments or related art of the present disclosure, the drawings needed in the specific embodiments or related art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] FIG. 1 is a structural schematic diagram of a blood pressure measurement device according to an embodiment of the present disclosure;

[0032] FIG. 2 is a structural schematic diagram of an air bag according to an embodiment of the present disclosure;

[0033] FIG. 3 is a structural schematic diagram of another blood pressure measurement device according to an embodiment of the present disclosure;

[0034] FIG. 4 is a schematic diagram of a blood pressure measurement scene according to an embodiment of the present disclosure;

[0035] FIG. 5 is a curve schematic diagram of a Korotkoff sound signal according to an embodiment of the present disclosure;

[0036] FIG. 6 is a curve schematic diagram of another Korotkoff sound signal according to an embodiment of the present disclosure;

[0037] FIG. 7 is a schematic diagram of a frequency spectrum of a Korotkoff sound signal according to an embodiment of the present disclosure;

[0038] FIG. 8 is a schematic diagram of a Korotkov digital signal processing flow according to an embodiment of the present disclosure;

[0039] FIG. 9 is a schematic diagram of a display interface according to an embodiment of the present disclosure;

[0040] FIG. 10 is a flowchart of a blood pressure measurement method according to an embodiment of the present disclosure;

[0041] FIG. 11 is a flowchart of Korotkov sound playback and blood pressure playback according to an embodiment of the present disclosure;

[0042] FIG. 12 is a flowchart of another blood pressure measurement method according to an embodiment of the present disclosure;

[0043] FIG. 13 is a flowchart of yet another blood pressure measurement method according to an embodiment of the present disclosure;

[0044] FIG. 14 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present disclosure.

[0045] Reference signs: 101, air pressure sensor; 102, piezoelectric sensor; 1021, first piezoelectric sheet; 1022, second piezoelectric sheet; 103, control module; 104, storage module; 105, audio output module; 106, display module; 107, cuff; 1071, fixing member; 108, air bag; 1081, air nozzle; 109, air tube; 110, air pump; 200, host; 201, first volume key; 202, second volume key; 203, control key; 204, icon display key; 205, play key; 310, processor; 320, memory; 330, communication interface. DETAILED DESCRIPTION

[0046] To make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0047] Blood pressure is the pressure of blood flowing in a blood vessel against the side wall of the blood vessel, is the driving force for blood flowing in the blood vessel, and is an important parameter reflecting basic life signs of a human body. Blood pressure can provide a basis for a doctor to evaluate a physical condition of a patient, for example, can be used to determine whether the patient has hypertension, cardiovascular disease, or kidney disease, etc., so the measurement of blood pressure is crucial.

[0048] For non-invasive blood pressure measurement technology, the most accurate method is recognized as Korotkoff method, which determines blood pressure value by listening to the sound of blood flow in brachial artery when the air bag of cuff is deflated. However, the process of blood pressure measurement by Korotkoff method has many limitations, such as relying on the hearing and subjective judgment of medical staff, being susceptible to environmental noise, etc., which may lead to errors in measured blood pressure and affect the diagnosis results of medical staff.

[0049] Therefore, the present disclosure provides a blood pressure measuring device with Korotkoff sound recognition and playback function, i.e. a sphygmomanometer with Korotkoff sound recognition and playback function. Through the cooperation of the air pressure sensor, the piezoelectric sensor and the control module, the Korotkoff sound signal can be accurately recognized from the brachial artery pulsation signal, and then the Korotkoff sound data and the air pressure data corresponding to the Korotkoff sound data can be accurately determined, which provides original measurement data for determining blood pressure value and helps to improve the accuracy of blood pressure measurement. The Korotkoff sound refers to the sound of blood flow impacting the blood vessel wall when the air bag is inflated and pressurized to deflated and depressurized. The first sound of blood flow impacting the blood vessel wall is the first sound of Korotkoff sound in the blood pressure measurement process, and the pressure in the air bag corresponding to the first sound of Korotkoff sound is the systolic pressure, i.e. high pressure, of the blood pressure value. The sound when the sound of blood flow impacting the blood vessel wall becomes weak or disappears is the last sound of Korotkoff sound in the blood pressure measurement process, and the pressure in the air bag corresponding to the last sound of Korotkoff sound is the diastolic pressure, i.e. low pressure, of the blood pressure value.

[0050] The present disclosure obtains the blood pressure value from the Korotkoff sound and the pressure in the air bag, which is the systolic pressure and diastolic pressure. Moreover, the blood pressure measuring device of the present disclosure plays back the Korotkoff sound used to determine blood pressure, the air pressure of the air bag pressure reduction process and displays the blood pressure value in response to the playback operation of the user during the blood pressure measurement process. Specifically, in response to the playback operation, the Korotkoff sound, air pressure and systolic pressure and diastolic pressure are played back synchronously, the playback of the Korotkoff sound is represented by sound playing or the beating of the heartbeat graphic symbol on the display screen, the playback of the air bag pressure reduction process is represented by the display of the change of the number on the display screen, and the blood pressure value is displayed by combining the number with the words "systolic pressure" or "high pressure", "diastolic pressure" or "low pressure".

[0051] The embodiments provided by the present disclosure can identify Korotkoff sound to obtain blood pressure value and play back Korotkoff sound to determine whether the blood pressure value is accurate, which is convenient for the user to verify the accuracy of the blood pressure measurement result by analyzing the Korotkoff sound.

[0052] The blood pressure measuring device provided by the present disclosure will be described in detail below in combination with the drawings.

[0053] As shown in FIG. 1 and FIG. 3, the blood pressure measuring device includes but is not limited to a host 200, an air pressure sensor 101, a piezoelectric sensor 102, a control module 103, a storage module 104, an audio output module 105 and a display module 106.

[0054] The piezoelectric sensor 102 is fixed in the cuff 107 by means of adhesion or buckling, etc. The air pressure sensor 101 is arranged in the host 200. The air pressure sensor 101 and the piezoelectric sensor 102 are in communication connection with the control module 103. The piezoelectric sensor 102 is a vibration sensor. Another vibration sensor, i.e. a microphone, can also be used in the embodiment.

[0055] The air pressure sensor 101 is used to collect a pressure analog signal and transmit the pressure analog signal to the control module 103. The pressure analog signal is used to represent the air pressure in the air bag of the cuff 107. The piezoelectric sensor 102 is used to collect a brachial artery pulsation signal and transmit the brachial artery pulsation signal to the control module 103. The brachial artery pulsation signal is used to represent the sound of blood flow in the brachial artery during blood pressure measurement.

[0056] As an embodiment, the control module 103 is used to control the air pressure in the air bag and identify Korotkoff sounds in the brachial artery pulsation signal collected by the vibration sensor. The systolic pressure data and diastolic pressure data are obtained according to the Korotkoff sounds and the air pressure in the air bag. The control module 103 is also used to play back and display the air pressure drop process in the air bag, the appearance and end process of the Korotkoff sounds, and the systolic pressure data and diastolic pressure data in response to the playback operation. The vibration sensor is the piezoelectric sensor 102 or the microphone. Moreover, the playback of the air pressure drop process in the air bag is displayed by numbers. The playback of the appearance and end process of the Korotkoff sounds is played back by the audio output module 105, i.e. a sound player, and / or played back by the jumping of the heartbeat graphic symbol on the display module 106, i.e. a display screen. The control module is also used to store the blood pressure measurement data in the local storage module 104 and send the blood pressure measurement data to an external device such as a mobile phone or a computer device for storage in a wireless or wired manner. The Korotkoff sounds and the pressure are synchronously played back and the blood pressure value is displayed according to the playback operation.

[0057] As a further example, the control module 103 is configured to identify the brachial artery pulse signal to obtain the Korotkoff signal, and to process the pressure simulation signal and the Korotkoff signal to obtain blood pressure data containing a blood pressure value as a blood pressure measurement result, i.e. a systolic pressure identified as high pressure and a diastolic pressure identified as low pressure; the control module 103 is further configured to obtain Korotkoff data from the Korotkoff signal; the control module 103 is further configured to store the blood pressure data and the Korotkoff data synchronously in the storage module 104, and to perform synchronous playback of the Korotkoff playback and the air pressure playback in response to a playback operation and display the blood pressure value simultaneously or after the playback is completed, and to establish a corresponding relationship between the Korotkoff data and the air pressure based on a playback time period, i.e. to play back the Korotkoff data corresponding to the air pressure at the same time as the air pressure is played back, and to play back the air pressure corresponding to the Korotkoff data at the same time as the Korotkoff data is played back. That is, the control module 103 performs synchronous playback of the Korotkoff data and the air pressure data in response to the playback operation, i.e. synchronous playback of the Korotkoff, the air pressure of the air bag decompression process and the blood pressure value. Among them, the air pressure of the air bag decompression process is played back in the form of air pressure value, and the blood pressure value is the high and low pressure determined after the air bag decompression is completed, i.e. the systolic pressure and the diastolic pressure.

[0058] The present disclosure does not limit the type and specific position of the air pressure sensor 101, as long as it can collect the air pressure in the air bag 108 of the cuff 107 during blood pressure measurement. For example, the air pressure sensor 101 can be a piezoelectric air pressure sensor, a capacitive air pressure sensor or a strain gauge air pressure sensor, etc.

[0059] For example, as shown in FIGS. 1 and 2, the cuff 107 has a storage space, and the air bag 108 for storing air is arranged in the storage space. The air bag 108 is provided with an air nozzle 1081, and the air bag 108 is connected to the air pump 110 through the air nozzle 1081 and the air pipe 109. The air pump 110 is connected to the control module 103. In this embodiment, the air pressure sensor 101 can be arranged in the end of the air pipe 109 close to the air pump 110. The pressure of the air bag 108 is transmitted to the air pressure sensor 101 through the air nozzle 1081 and the air pipe 109. The specific position of the air pressure sensor 101 on the air pipe 109 can be determined by designers according to experience.

[0060] Optionally, the end of the air pipe 109 close to the control air pump 110 is further provided with an air valve (not shown in the figure), and the air valve is connected to the control module 103. The control module 103 can adjust the speed of pressurizing or decompressing the air bag 108 by controlling the opening degree of the air valve, so as to control the air pressure in the air bag 108. Slow and stable decompression helps to more accurately collect the Korotkoff sound.

[0061] Specifically, the opening degree is used to represent the opening degree or closing degree of the gas valve, and the opening degree can be represented by a proportional value or an angle value. If the opening degree represents the opening degree, 100% represents that the gas valve is fully opened. At this time, the larger the opening degree (closer to 100%), the greater the flow of gas, and the faster the speed of the airbag pressurization or depressurization.

[0062] The specific position of the piezoelectric sensor 102 is not limited in the embodiments of the present disclosure, as long as the Korotkoff sound can be collected during blood pressure measurement. The piezoelectric sensor 102 can be fixedly arranged on the lower side of the airbag 108 in the cuff 107, so that the piezoelectric sensor 102 is located at the brachial artery position of the arm during blood pressure measurement. The piezoelectric sensor can be provided with two, respectively corresponding to the brachial artery position of the left arm and the brachial artery position of the right arm. The lower side of the airbag 108 refers to the side of the airbag 108 facing the skin of the user during blood pressure measurement, that is, the inner wall of the airbag. The piezoelectric sensor 102 can also be a microphone. The piezoelectric sensor and the microphone both belong to vibration sensors.

[0063] The control module 103 is also in communication connection with the storage module 104, the audio output module 105 and the display module 106 respectively, and the control module 103 is used to acquire the pressure analog signal and the brachial artery pulsation signal, and is used to identify the brachial artery pulsation signal to acquire the Korotkoff sound signal and acquire the Korotkoff sound data according to the Korotkoff sound signal. The control module 103 is also used to process the pressure analog signal and the Korotkoff sound signal to obtain the blood pressure data, wherein the blood pressure data includes the air pressure and the blood pressure value of the airbag depressurization process, and the blood pressure value is the systolic pressure and the diastolic pressure; the control module 103 is also used to store the blood pressure data and the Korotkoff sound data to the storage module at the same time, and is used to respond to the playback operation to synchronously playback the Korotkoff sound data and the air pressure data, so as to control the audio output module 105 to play the Korotkoff sound according to the Korotkoff sound data read from the storage module 104, and control the display module 106 to play the air pressure according to the blood pressure data corresponding to the Korotkoff sound data read from the storage module 104 and display the blood pressure value. That is, when the audio output module 105 plays the Korotkoff sound, the display module 106 displays the pressure in the airbag 108 when the Korotkoff sound appears. The control module 103 is also used to associate and store the blood pressure measurement data of the blood pressure measurement process, including the corresponding measurement time, air pressure, blood pressure value and Korotkoff sound data, to the storage module, that is, to store the association relationship to the storage module, and respond to the playback operation to playback the air pressure drop process in the airbag, the appearance of the Korotkoff sound and the end process, and simultaneously display the blood pressure value.

[0064] Specifically, the control module 103 first identifies the brachial artery pulsation signal to obtain the Korotkoff signal, filters the pressure simulation signal based on the Korotkoff signal, retains the pressure simulation signal corresponding to the collection time of the Korotkoff signal, converts the Korotkoff signal and the pressure simulation signal corresponding to the Korotkoff signal to obtain blood pressure data, the blood pressure data including the air pressure and the blood pressure value in the air bag pressure reduction process, the format of the blood pressure data being adapted to the format recognizable by the display module, converts the Korotkoff signal to obtain Korotkoff data, the format of the Korotkoff data being adapted to the format recognizable by the audio output module.

[0065] That is, after the control module 103 obtains the pressure simulation signal from the air pressure sensor 101 and the brachial artery pulsation signal from the piezoelectric sensor 102, the control module 103 processes the pressure simulation signal to obtain the pressure in the air bag, identifies the brachial artery pulsation signal to obtain the Korotkoff signal, then filters the pressure simulation signal based on the Korotkoff signal, and converts the filtered pressure simulation signal and the Korotkoff signal to blood pressure data recognizable by the display module 106 to display the blood pressure measurement results, i.e., the systolic pressure and the diastolic pressure, converts the Korotkoff signal to Korotkoff data recognizable by the audio output module 105, and stores the blood pressure data and the Korotkoff data to the storage module 104 at the same time.

[0066] Then, if the user performs a playback operation (for example, presses a preset key with a preset action), the playback operation further includes that the user selects the blood pressure measurement data to be played back through the function key on the blood pressure measurement device, and then presses the preset key with the preset action to start the playback operation. The control module 103 responds to the playback operation to synchronously play back the pressure, the Korotkoff sound, and the blood pressure value in the air bag pressure reduction process, reads the Korotkoff data from the storage module 104, and controls the audio output module 105 to play the Korotkoff sound occurring in the blood pressure measurement process. At the same time, the control module 103 also reads the blood pressure data from the storage module 104, and controls the display module 106 to simultaneously display the air pressure corresponding to the played Korotkoff sound and the blood pressure value in the blood pressure measurement process. That is, when the user performs the playback operation, the blood pressure measurement device synchronously plays back the Korotkoff data and the air pressure data and displays the blood pressure value. The conversion process is described below and will not be described in detail here.

[0067] It should be noted that, to ensure the synchronous collection of the Korotkoff sound and the air pressure, the collection start time of the air pressure sensor 101 and the collection start time of the piezoelectric sensor 102 are the same, the collection start time of the air pressure sensor 101 refers to the time when the air pressure sensor 101 starts to collect the pressure simulation signal, and the collection start time of the piezoelectric sensor 102 refers to the time when the piezoelectric sensor 102 starts to collect the brachial artery pulsation signal.

[0068] Exemplarily, the starting time of the collection of the air pressure sensor 101 and the starting time of the collection of the piezoelectric sensor 102 can be synchronized by a timer or other timing device.

[0069] Exemplarily, the control module 103 in the embodiment can be a central processing unit (CPU), a microcontroller unit (MCU), or a programmable logic device that realizes the above functions. The storage module 104 can be a common storage medium, for example, a secure digital memory card (SD), a flash memory, or a random access memory (RAM), etc. The audio output module 105 can be a loudspeaker or a headset, etc. The display module 106 can be a liquid crystal display screen, a light emitting diode (LED) display screen, or a touch screen, etc.

[0070] It should be understood that, as shown in FIG. 1, the cuff 107 is also provided with a fixing member 1071, which includes but is not limited to a bandage or a magic tape, etc.

[0071] Specifically, as shown in FIG. 3, the air pressure sensor 101, the air pump 110, the control module 103, the storage module 104, the audio output module 105, and the display module 106 can be integrated on the host 200.

[0072] The following takes FIGS. 1, 3, and 4 as examples to describe the process of blood pressure measurement by the blood pressure measurement device adopting the first embodiment and the second embodiment provided by the disclosure. The air pump 110, the control module 103, the storage module 104, the audio output module 105, and the display module 106 are integrated in the host 200 shown in FIG. 3. The display module 106 is the display screen of the host 200, and the heart beat graphic symbol is displayed on the display screen, as shown in FIG. 9. During the test process, the heart beat graphic symbol displays the frequency and process of the Korotkoff sound heard by auscultation in a jumping manner. During the Korotkoff sound playback process, the heart beat graphic symbol displays the frequency and process of the Korotkoff sound playback in a jumping manner. Of course, the playback of the Korotkoff sound can also be played by the audio output module 105.

[0073] When the medical staff measures the blood pressure of the patient or the user measures the blood pressure by himself / herself, first, as shown in FIG. 3, the cuff 107 is wound and fixed on the arm of the user through the fixing part 1071, so that the piezoelectric sensor 102 is located at the brachial artery position of the arm. Then, the user starts the blood pressure measurement, and the control module 103 in the host 200 controls the air pump 110 to inflate the air bag 108 through the air pipe 109 and the air nozzle 1081 in response to the measurement operation, so as to increase the pressure of the air bag 108 until the air pressure in the air bag can block the blood flow of the arterial blood vessels. After that, the control module 103 controls the air pump 110 to deflate the air bag 108 through the air pipe 109 and the air nozzle 1081, so as to slowly decrease the pressure in the air bag 108. In this process, the air pressure sensor 101 collects the air pressure in the air bag during the deflation process in real time, and sends a pressure analog signal representing the air pressure in the air bag to the control module 103, and the piezoelectric sensor 102 collects the brachial artery pulsation signal in real time and sends the brachial artery pulsation signal to the control module 103.

[0074] After receiving the pressure analog signal and the brachial artery pulsation signal, the control module 103 identifies the Korotkoff sound signal from the brachial artery pulsation signal, processes the pressure analog signal to obtain the air pressure in the air bag, identifies the air pressure in the air bag corresponding to the first Korotkoff sound as the systolic pressure, and identifies the air pressure in the air bag corresponding to the disappearance or weakening of the Korotkoff sound as the diastolic pressure. Moreover, the Korotkoff sound, the air pressure and the blood pressure value during the blood pressure measurement process are stored in the local or sent to the external device for storage after the blood pressure measurement is completed, and the control module 103 synchronously plays back the Korotkoff sound, the air pressure during the blood pressure measurement process in response to the playback operation, displays the systolic pressure when the Korotkoff sound appears, displays the diastolic pressure when the Korotkoff sound disappears or weakens, or displays the systolic pressure and the diastolic pressure after the playback of the Korotkoff sound and the pressure is completed. The embodiments provided in the disclosure can not only identify the Korotkoff sound for accurate blood pressure measurement, but also play back the air pressure and the Korotkoff sound during the blood pressure measurement process, so as to facilitate the user to verify the accuracy of the blood pressure measurement by analyzing the change of the Korotkoff sound.

[0075] As a further example, after receiving the pressure simulation signal and the brachial artery pulse signal, the control module 103 can also identify the Korotkoff signal from the brachial artery pulse signal, obtain the Korotkoff data from the Korotkoff signal, and then process the pressure simulation signal and the Korotkoff signal to obtain the blood pressure data, which includes the air pressure data and the blood pressure value identified based on the Korotkoff, and then store the blood pressure data and the Korotkoff data in the storage module 104. The blood pressure data, the Korotkoff data, and the corresponding measurement time can also be associated and stored in the storage module 104 as blood pressure measurement data. When the user performs a playback operation, the control module 103 responds to the playback operation to play back the Korotkoff of the blood pressure measurement process, the air pressure of the air bag pressure reduction process, and the blood pressure value. Specifically, the control module 103 reads the Korotkoff data from the storage module 104 and controls the audio output module 105 to play the Korotkoff or display the Korotkoff through the jumping of the heartbeat graphic symbol on the display screen, or simultaneously play the Korotkoff through the audio output module 105 and the heartbeat graphic symbol on the display screen. At the same time, the control module 103 also reads the blood pressure data corresponding to the Korotkoff data from the storage module 104 and controls the display module 106 to display the air pressure value in the blood pressure data corresponding to the played Korotkoff in a digital manner and simultaneously display the blood pressure value. The control module 103 sets the identification threshold of the Korotkoff signal according to the comparison result of the average arterial signal intensity of the brachial artery pulse signal in the preset time period and the preset threshold, and identifies the Korotkoff signal based on the identification threshold. The arterial signal intensity greater than the arterial intensity signal corresponding to the identification threshold is determined as the Korotkoff signal.

[0076] The blood pressure measurement device provided by the embodiment can accurately identify the Korotkoff signal from the brachial artery pulse signal through the cooperation of the air pressure sensor 101, the piezoelectric sensor 102, and the control module 103, and further accurately determine the Korotkoff data and the air pressure corresponding to the Korotkoff data, and identify the blood pressure value based on the Korotkoff and the air pressure. In response to the playback operation, the Korotkoff, the air pressure of the air bag pressure reduction process, and the blood pressure value are played back at the same time. The embodiment provides original measurement data for determining the blood pressure value, which helps to improve the accuracy of blood pressure measurement. By playing back the Korotkoff and the air pressure in the air bag, the user can observe the appearance and disappearance time of the Korotkoff and judge the blood pressure value based on the played air pressure, which provides a self-verification scheme for the accuracy of the blood pressure measurement result.

[0077] Meanwhile, the blood pressure measuring device is provided with the storage module 104, the audio output module 105 and the display module 106, so that the Korotkoff sound and the blood pressure value in the blood pressure measuring process can be recorded and stored in real time, the data integrity and accuracy are ensured, the Korotkoff sound, the air pressure in the air bag during the air pressure reduction process and the blood pressure value corresponding to the Korotkoff sound during the measuring process can be played back at any time, the medical staff can check and analyze the collected data for multiple times, the blood pressure of the user can be determined more accurately, and the medical staff can more accurately determine whether there is a phenomenon such as arrhythmia or atrial fibrillation.

[0078] Specifically, during the blood pressure measuring process, the air pressure sensor 101 can collect pressure analog signals at a pressure sampling frequency f1 to obtain a plurality of pressure analog signals, the piezoelectric sensor 102 can collect brachial artery pulsation signals at a piezoelectric sampling frequency to obtain a plurality of brachial artery pulsation signals, and after the control module 103 obtains the plurality of pressure analog signals and the plurality of brachial artery pulsation signals, the plurality of brachial artery pulsation signals can be recognized to obtain a plurality of Korotkoff sound signals, the plurality of pressure analog signals can be processed to obtain a plurality of pressure data, i.e., air pressure data in the air bag, then the plurality of pressure analog signals and the plurality of Korotkoff sound signals are processed to obtain a plurality of blood pressure data, and the plurality of Korotkoff sound signals are processed to obtain a plurality of Korotkoff sound data, wherein the blood pressure data includes the air pressure data. Moreover, the plurality of air pressure data is provided with an air pressure playback serial number according to the collection time, the plurality of Korotkoff sound data is provided with an audio playback serial number according to the collection time, and the plurality of Korotkoff sound data is played at an audio playing frequency f2 when the Korotkoff sound is played back.

[0079] In order to ensure that the played Korotkoff sound and the displayed blood pressure correspond to each other, the control module 103 first determines a playback data segment and a playback time segment based on the pressure analog signals and the Korotkoff sound signals. The playback data segment includes a Korotkoff sound playback data segment and a blood pressure playback data segment, and the playback time segment is a time segment during which the Korotkoff sound data and the blood pressure data are synchronously played back.

[0080] Specifically, the Korotkoff sound playback data segment includes Korotkoff sound data between the Nth second before the start time of the Korotkoff sound data and the Mth second after the disappearance time of the Korotkoff sound data, the air pressure playback data segment is air pressure data corresponding to the Korotkoff sound playback data segment, the playback time segment is consistent with the length of the playback data segment, N≥1, and M≥1. The Korotkoff sound playback data segment may also include noise data between the Nth second before the start time of the Korotkoff sound data and the Mth second after the disappearance time of the Korotkoff sound data.

[0081] The playback time segment T3 is the difference between the playback end time T2 of the Korotkoff sound playback and the playback start time T1 of the Korotkoff sound playback, i.e., T3=T2-T1, the playback end time is the Mth second after the disappearance time of the Korotkoff sound data, and the playback start time is the Nth second before the start time of the Korotkoff sound data.

[0082] Taking N=1 and M=1 as an example, the data segment of the Korotkoff sound playback includes the Korotkoff sound data between 1s before the first Korotkoff sound occurrence time and 1s after the last Korotkoff sound occurrence time, and the data segment of the air pressure playback is all the air pressure data in the time period corresponding to the data segment of the Korotkoff sound playback. At this time, the playback time period can be the difference between 1s before the first Korotkoff sound occurrence time and 1s after the last Korotkoff sound occurrence time.

[0083] After determining the playback time period, the control module 103 is further configured to determine an audio playback sequence number of the Korotkoff sound playback based on the playback time period and the audio playing frequency of the Korotkoff sound, and determine an air pressure playback sequence number of the air pressure playback based on the playback time period and the pressure sampling frequency of the air pressure. The control module 103 is further configured to read the Korotkoff sound data from the storage module based on the audio playback sequence number, and read the air pressure data corresponding to the Korotkoff sound data from the storage module based on the air pressure playback sequence number. The audio playback sequence number and the air pressure playback sequence number establish the correspondence between the Korotkoff sound data and the air pressure data at the same time in the playback time period based on the playback time period, that is, the correspondence between the Korotkoff sound data and the air pressure data at the same time in the playback time period is established based on the playback time period, the audio playback sequence number and the air pressure playback sequence number, and in the process of playing back the Korotkoff sound, the first Korotkoff sound corresponding to the air pressure value at the time of the occurrence of the Korotkoff sound is identified as the systolic pressure and displayed, and the air pressure value corresponding to the time when the Korotkoff sound becomes weak or disappears is identified as the diastolic pressure and displayed.

[0084] The audio playback sequence number can be the product of the playback time period T3 and the audio playing frequency f2, that is, the audio playback sequence number is (T3 x f2), and the air pressure playback sequence number can be the product of the playback time period T3 and the pressure sampling frequency f1, that is, the air pressure playback sequence number is (T3 x f1).

[0085] The process of identifying the Korotkoff sound signal from the brachial artery pulsation signal mentioned above will be described in detail below with reference to the accompanying drawings.

[0086] For example, the control module 103 sets the identification threshold of the Korotkoff sound signal according to the comparison result of the average arterial signal intensity of the brachial artery pulsation signal in the preset time period and the preset threshold, and identifies the Korotkoff sound signal according to the identification threshold.

[0087] Specifically, after obtaining the brachial artery pulsation signal, the control module 103 performs a band-pass filtering process on the brachial artery pulsation signal in a preset frequency range to remove interference signals to obtain an arterial intensity signal. Then, the control module 103 obtains the numerical difference between the maximum value and the minimum value of each arterial intensity signal in a preset collection time period, and takes the numerical difference as the arterial signal intensity of each time. Subsequently, the control module 103 obtains the average value of the arterial signal intensity of all times to obtain an arterial signal intensity average (Value), and sets the recognition threshold of the Korotkoff sound signal according to the comparison result of the arterial signal intensity average, the first preset threshold, and the second preset threshold.

[0088] Subsequently, the control module 103 determines whether the intensity of each arterial intensity signal (i.e., the arterial signal intensity) is greater than the recognition threshold. If the arterial signal intensity is greater than the recognition threshold, the arterial intensity signal is determined as the Korotkoff sound signal. That is, the control module 103 determines the brachial artery pulsation signal corresponding to the arterial intensity signal whose arterial signal intensity is greater than the recognition threshold as the Korotkoff sound signal.

[0089] For example, after determining the arterial signal intensity average, when the arterial signal intensity average is less than the first preset threshold, the recognition threshold of the Korotkoff sound signal is set as the first recognition threshold; when the arterial signal intensity average is greater than the second preset threshold, the second recognition threshold of the Korotkoff sound signal is set as P times the arterial signal intensity average; and when the arterial signal intensity average is between the first preset threshold and the second preset threshold, the third recognition threshold of the Korotkoff sound signal is set as 2P times the arterial signal intensity average.

[0090] Specifically, the arterial signal intensity average between the first preset threshold and the second preset threshold means that the arterial signal intensity average is greater than or equal to the first preset threshold, and the arterial signal intensity average is less than or equal to the second preset threshold.

[0091] Wherein, P>0, the preset frequency range, the preset collection time period, the first preset threshold, the second preset threshold, the first recognition threshold, and P can be empirical values, which can be adjusted according to actual needs. For example, the preset frequency range can be [20Hz, 120Hz], the preset collection time period can be 1s or 2s, etc., the first preset threshold can be 0.005, the second preset threshold can be 0.008, the first recognition threshold can be 0.015, and P can be 1.5.

[0092] For example, when the preset frequency range is [20Hz, 120Hz], the preset collection time period is 1s, the first preset threshold is 0.005, the second preset threshold is 0.008, the first recognition threshold is 0.015, and P is 1.5, the process of identifying the Korotkoff sound signal from the brachial artery pulsation signal is described.

[0093] Specifically, after the brachial artery pulse signal is acquired, the brachial artery pulse signal is band-pass filtered in [20 Hz, 120 Hz] to remove interference signals, and an arterial intensity signal is obtained, which can be shown in FIG. 5 or FIG. 6; after the arterial intensity signal is determined, the maximum value and the minimum value in the data of each arterial intensity signal within 1 s are determined, and the numerical difference between the maximum value and the minimum value is taken as the arterial signal intensity of each time. After the arterial signal intensity of all arterial intensity signals is obtained, the average value of the arterial signal intensity of all times is determined as the average arterial signal intensity.

[0094] Then the recognition threshold is determined. Specifically, when the average arterial signal intensity is less than 0.005, the recognition threshold of the Korotkoff signal is the first recognition threshold, i.e., 0.015; when the average arterial signal intensity is greater than 0.008, the recognition threshold of the Korotkoff signal is the second recognition threshold, i.e., 1.5 times the average arterial signal intensity; and when the average arterial signal intensity is in the interval [0.005, 0.008], the recognition threshold is the third recognition threshold, i.e., 3 times the average arterial signal intensity.

[0095] Then, it is determined whether the intensity of each arterial intensity signal is greater than the recognition threshold. If the arterial signal intensity is greater than the recognition threshold, the arterial intensity signal is determined as the Korotkoff signal, and the spectrogram of the Korotkoff signal can be shown in FIG. 7.

[0096] Specifically, the abscissa of FIG. 5 and FIG. 6 represents time, which can be in seconds (s), and the ordinate represents the amplitude of the Korotkoff signal, which can be in volts (V). FIG. 7 shows the energy distribution of the Korotkoff signal at different frequencies.

[0097] In some optional embodiments, the control module 103 is further configured to determine a blood pressure measurement result based on the blood pressure data and the Korotkoff data after the blood pressure data and the Korotkoff data are determined, and to control the display module 106 to display the blood pressure measurement result, and the control module 103 is further configured to respond to the playback operation after the display module 106 displays the blood pressure measurement result.

[0098] The blood pressure measurement result includes a low pressure signal and a high pressure signal to measure high blood pressure and low blood pressure. The high pressure signal refers to the blood pressure value corresponding to the first Korotkoff sound in the blood pressure measurement process, and the low pressure signal refers to the blood pressure value corresponding to the disappearance or appearance of the Korotkoff sound in the blood pressure measurement process. Therefore, the blood pressure data of the present embodiment includes the air pressure in the air bag deflation process and the blood pressure value as the blood pressure measurement result.

[0099] In some optional embodiments, the piezoelectric sensor 102 can be communicatively connected with the control module 103 through a connecting line built in the air tube 109. The piezoelectric sensor 102 includes a first piezoelectric sheet 1021 and a second piezoelectric sheet 1022, one side of the first piezoelectric sheet 1021 and the second piezoelectric sheet 1022 can be fixed inside or outside the air bag 108 by adhesion, and optionally all the piezoelectric sheets are arranged on the inner surface of the air bag 108. All the piezoelectric sheets on the device of the present embodiment collectively collect piezoelectric signals to obtain the Korotkoff sound signals described above, and transmit the Korotkoff sound signals to the control module 103.

[0100] In the present embodiment, by placing the connecting line in the air tube 109, the air tube 109 is multiplexed without the need to separately lead out the connecting line, so that the host computer 200 and the cuff 107 only need to be connected through the air tube, thereby simplifying the structure of the blood pressure measuring device.

[0101] Optionally, the first piezoelectric sheet 1021 and the second piezoelectric sheet 1022 are arranged in the lower half of the cuff 107, and during blood pressure measurement, one of the first piezoelectric sheet 1021 and the second piezoelectric sheet 1022 corresponds to the position corresponding to one of the left brachial artery and the right brachial artery, and the distance between the first piezoelectric sheet and the second piezoelectric sheet in the present embodiment can be 100 mm.

[0102] In some optional embodiments, the control module 103 includes an analog-to-digital conversion unit and a processing unit.

[0103] Specifically, the analog-to-digital conversion unit is configured to convert the pressure analog signal into a pressure digital signal, and convert the Korotkoff sound signal into a Korotkoff sound digital signal. For example, the analog-to-digital conversion unit can be an Analog-to-Digital Converter (ADC) chip or an ADC interface of an MCU.

[0104] The processing unit is configured to perform time-frequency conversion processing on the Korotkoff sound digital signal to obtain a first frequency domain feature, and amplify the first frequency domain feature to obtain a second frequency domain feature. The processing unit is further configured to shift the second frequency domain feature by a predetermined frequency as a whole to obtain a third frequency domain feature, perform frequency-time conversion processing on the third frequency domain feature to obtain a first time domain feature, and amplify the first time domain feature to obtain Korotkoff sound data.

[0105] Specifically, after receiving the click sound digital signal, the processing unit performs a Fast Fourier Transform (FFT) on the click sound digital signal, converts the click sound digital signal into a first frequency domain feature, then amplifies the first frequency domain feature through an operational amplifier, converts the first frequency domain feature into a second frequency domain feature, then shifts the second frequency domain feature by a preset frequency as a whole, converts the second frequency domain feature into a third frequency domain feature, then performs an Inverse Fast Fourier Transform (IFFT) on the third frequency domain feature, converts the third frequency domain feature into a first time domain feature, and finally amplifies the first time domain feature through the operational amplifier, converts the first time domain feature into the click sound data.

[0106] wherein the amplifying the first frequency domain feature refers to amplifying the first frequency domain feature by Q times, and Q can be 10, 20, 30, 100 or more than 100, etc. The preset frequency can be determined by the designer based on the response frequency of the audio output module 105. For example, the audio output module 105 is a loudspeaker, and the frequency range of the first frequency domain feature is 15 Hz to 150 Hz, at this time, the preset frequency can be 30 Hz.

[0107] Exemplarily, the first time domain feature can be amplified based on the following formula (1). Output_value = (2 x 32767 x (input_value-min) / (max-min)-32767) (1)

[0108] wherein Output_value represents the click sound data, input_value represents the first time domain feature, min represents the minimum value of the sound signal in the first time domain feature, max represents the maximum value of the sound signal in the first time domain feature, and the output value range of the sound signal is [-32768, 32767].

[0109] Specifically, after receiving the pressure digital signal, the processing unit is further configured to process the click sound digital signal and the pressure digital signal based on the calibration parameter to obtain the blood pressure data.

[0110] Exemplarily, the blood pressure data can be determined based on the following formula (2). P = (P1-P0) x K (2)

[0111] wherein P represents the blood pressure data, P1 represents the pressure digital signal, P0 represents the calibration parameter, the calibration parameter refers to the pressure digital signal of the air pressure sensor 101 under the ambient atmospheric pressure, and K represents the slope, the slope refers to the linearity of the air pressure sensor.

[0112] Specifically, after the Korotkoff sound digital signal is determined, the pressure digital signal is screened based on the Korotkoff sound digital signal, the pressure digital signal corresponding to the time of the Korotkoff sound digital signal is reserved, and then the screened pressure digital signal is input into formula (2) to determine the blood pressure data.

[0113] In this embodiment, after the Korotkoff sound digital signal is determined, the Korotkoff sound digital signal is subjected to time-frequency conversion, amplification, frequency shift, frequency-time conversion and amplification processing, which can improve the problem of poor response of the audio output module 105 due to the fact that the sound frequency of the Korotkoff sound contains more low-frequency components, and improve the playing effect of the audio output module 105.

[0114] Optionally, the control module 103 further comprises a notch filter, and the notch filter is configured to perform denoising processing on the Korotkoff sound digital signal to obtain a denoised Korotkoff sound digital signal. At this time, the processing unit is specifically configured to perform time-frequency conversion processing on the denoised Korotkoff sound digital signal to obtain the first frequency domain feature.

[0115] Specifically, after the Korotkoff sound digital signal is determined, the process of converting the Korotkoff sound digital signal into Korotkoff sound data can be as shown in FIG. 8. The Korotkoff sound digital signal is first subjected to denoising processing by the notch filter, then subjected to time-frequency conversion processing by the FFT, then subjected to amplification processing (for example, amplification by 100 times) by the first amplifier, then subjected to frequency shift processing (for example, upward shift by 30 Hz), then subjected to frequency-time conversion processing by the IFFT, and finally subjected to amplification processing (formula (1)) by the second amplifier to obtain the Korotkoff sound data.

[0116] In this embodiment, after the Korotkoff sound digital signal is subjected to denoising processing, the Korotkoff sound digital signal is then subjected to time-frequency conversion processing, which can filter out the 50 Hz power frequency interference in the Korotkoff sound digital signal and improve the accuracy of the Korotkoff sound data obtained based on the Korotkoff sound digital signal.

[0117] For example, after the pressure analog signal and the Korotkoff sound signal are determined, the processing unit is further configured to determine a storage time period based on the storage space of the storage module 104, convert the pressure analog signal in the storage time period into a pressure digital signal, obtain the air pressure data and the blood pressure value by processing the pressure digital signal and the Korotkoff sound signal and store them in the storage space, convert the Korotkoff sound signal in the storage time period into a Korotkoff sound digital signal, and then obtain the Korotkoff sound data and store them in the storage space.

[0118] In one example, the processing unit is configured to determine the time length between the collection time of the first pressure simulation signal and the collection time of the last pressure simulation signal of the airbag pressure reduction process as the storage time period when the storage space of the storage module 104 is greater than the preset storage space. That is, the time period between the start of collection and the termination of collection of the airbag pressure sensor 101 during the airbag pressure reduction process is determined as the storage time period when the storage space of the storage module 104 is greater than the preset storage space.

[0119] Specifically, the preset storage space is the space required to store all blood pressure data and Korotkoff sound data in the first time period, and the first time period is the average length of time to complete blood pressure measurement. During blood pressure measurement, the airbag pressure sensor 101 can collect a plurality of pressure simulation signals at a pressure sampling frequency, and the piezoelectric sensor 102 can collect a plurality of brachial artery pulsation signals at a piezoelectric sampling frequency. If the storage space of the storage module 104 is greater than the preset storage space, it means that the storage space is sufficient, and at this time, the processing unit can store all the data collected during the airbag pressure reduction process of the blood pressure test in the storage space. The piezoelectric sampling frequency and the pressure sampling frequency are the same.

[0120] In another example, the processing unit is configured to determine the time length between the Nth second before the start of the Korotkoff sound data and the Mth second after the disappearance of the Korotkoff sound data as the storage time period when the storage space of the storage module is less than or equal to the preset storage space, where N≥1 and M≥1. That is, the storage time period and the length of the playback data segment are consistent, and the storage time period is the playback time period described above.

[0121] For example, N and M can both be 1s, 2s, or 3s, etc. Taking N and M as 2s as an example, the storage time period is the time length between the first 2s before the first Korotkoff sound and the last 2s after the last Korotkoff sound.

[0122] In some optional embodiments, the control module further includes a control unit, and the control unit is configured to control the display module 106 to synchronously display the pulse icon until the Korotkoff sound disappears or weakens when the audio output module 105 plays the first Korotkoff sound or N seconds before the first Korotkoff sound, where N≥1 second. The display interface at this time can be as shown in FIG. 9. Wherein, the heart-shaped mark in the lower half of FIG. 9 represents the pulse icon described above, and the numbers in the lower half of FIG. 9 represent the pressure at the current time, and the unit of pressure is millimeters of mercury (mmHg) or kilopascal (Kpa).

[0123] For example, the blood pressure measurement device further includes a playback button, the playback button is connected with the control module 103, and the playback button is configured to generate a playback signal based on a preset action to make the control module 103 respond to the playback operation.

[0124] Specifically, the playback button can be set separately, or any one of the original buttons on the host 200 can be used as the playback button. For example, as shown in FIG. 4, any one of the first volume button 201 (to increase the volume), the second volume button 202 (to decrease the volume), the control button 203 (to start the measurement and end the measurement), the icon display button 204, and the play button 205 provided on the host 200 can be used as the playback button.

[0125] The preset action triggering the generation of the playback signal can be defined by a designer. For example, the preset action can be long pressing for 3 seconds, short pressing for 1 second, or pressing 3 times in succession, and the playback signal can be a low-level signal or a high-level signal.

[0126] Optionally, the blood pressure measurement device further comprises a voice assistant connected with the control module 103. When the voice assistant receives a specific audio (for example, “please playback the pressure and Korotkoff sound” or “play the data”), the voice assistant generates a playback signal to make the control module 103 respond to the playback operation.

[0127] According to the embodiments of the present disclosure, an embodiment of a blood pressure measurement method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0128] In the present embodiment, a blood pressure measurement method with Korotkoff sound recognition and playback function is provided, which is used for the control module 103 described above. The method comprises:

[0129] Obtaining a pressure simulation signal of the pressure drop process in the air bag and a brachial artery pulsation signal;

[0130] Identifying the brachial artery pulsation signal to obtain a Korotkoff sound signal;

[0131] Processing the pressure simulation signal to obtain the air pressure of the pressure drop process in the air bag;

[0132] Processing the pressure simulation signal and the Korotkoff sound signal to obtain systolic pressure data and diastolic pressure data;

[0133] In response to the playback operation, synchronously playing back the pressure drop process in the air bag, the appearance of the Korotkoff sound until the end process, and displaying the systolic pressure data and the diastolic pressure data.

[0134] In this embodiment, the playback of the pressure drop process in the air bag is played back through digital display on the display screen, and the playback of the appearance of the Korotkoff sound until the end process is played back through a sound player or the beating of a heartbeat graphic symbol on the display screen, or a combination of both.

[0135] In another embodiment, a blood pressure measurement method is provided, which can be used in the control module 103 described above. The control module 103 can be a controller or a processor in a device such as a mobile phone, a computer, or a computer. FIG. 10 is a flowchart of a blood pressure measurement method according to an embodiment of the present disclosure. As shown in FIG. 10, the method comprises the following steps:

[0136] In step S1001, a pressure analog signal and a brachial artery pulsation signal are obtained.

[0137] The pressure analog signal is used to represent the air pressure in the cuff, and the brachial artery pulsation signal is used to represent the sound of blood flow in the brachial artery during blood pressure measurement.

[0138] Specifically, the control module obtains the pressure analog signal from the air pressure sensor, and obtains the brachial artery pulsation signal from the piezoelectric sensor.

[0139] In step S1002, the Korotkoff sound signal is obtained by identifying the brachial artery pulsation signal.

[0140] Specifically, step S1002 can comprise the following steps:

[0141] In step a1, the identification threshold of the Korotkoff sound signal is set according to the comparison result of the average arterial signal intensity of the brachial artery pulsation signal in a preset time period and a preset threshold.

[0142] Specifically, step a1 comprises the following steps:

[0143] In step a11, the brachial artery pulsation signal is band-pass filtered in a preset frequency range to obtain an arterial intensity signal.

[0144] For example, the arterial intensity signal can be as shown in FIG. 5 or FIG. 6. The preset frequency range is an empirical value and can be adjusted according to requirements. For example, the frequency range can be [20Hz, 120Hz].

[0145] In step a12, the numerical difference between the maximum value and the minimum value of each arterial intensity signal in a preset collection time period is obtained, and the numerical difference is taken as the arterial signal intensity of each time.

[0146] The preset collection time period can be an empirical value and can be adjusted according to actual needs. For example, the preset collection time period can be 1s or 2s, etc.

[0147] In step a13, the average value of the arterial signal intensity of all times is obtained to obtain the average arterial signal intensity.

[0148] In step a14, the identification threshold of the Korotkoff sound signal is set according to the comparison result of the average arterial signal intensity, the first preset threshold, and the second preset threshold.

[0149] Specifically, when the mean value of the arterial signal intensity is less than the first preset threshold, a first recognition threshold of the Korotkoff signal is set; when the mean value of the arterial signal intensity is greater than the second preset threshold, a second recognition threshold of the Korotkoff signal is set as P times the mean value of the arterial signal intensity. When the mean value of the arterial signal intensity is between the first preset threshold and the second preset threshold, a third recognition threshold of the Korotkoff signal is set as 2P times the mean value of the arterial signal intensity.

[0150] wherein P>0, the first preset threshold, the second preset threshold, the first recognition threshold and P can be empirical values, which can be adjusted according to actual needs. For example, the first preset threshold can be 0.005, the second preset threshold can be 0.008, the first recognition threshold can be 0.015, and P can be 1.5.

[0151] Specifically, the mean value of the arterial signal intensity between the first preset threshold and the second preset threshold means that the mean value of the arterial signal intensity is greater than or equal to the first preset threshold, and the mean value of the arterial signal intensity is less than or equal to the second preset threshold.

[0152] Step a2, identifying the Korotkoff signal according to the recognition threshold.

[0153] Specifically, the brachial artery pulsation signal corresponding to the arterial signal intensity greater than the arterial intensity signal corresponding to the recognition threshold is determined as the Korotkoff signal. The recognition threshold can be the first recognition threshold, the second recognition threshold or the third recognition threshold. That is, the control module determines whether the intensity of each arterial intensity signal (i.e. the arterial signal intensity) is greater than the recognition threshold, and if the arterial signal intensity is greater than the recognition threshold, the arterial intensity signal is determined as the Korotkoff signal.

[0154] Step S1003, processing the pressure simulation signal and the Korotkoff signal to obtain blood pressure data, the blood pressure data containing the air pressure and the blood pressure value of the airbag pressure reduction process, the blood pressure value being the systolic pressure and the diastolic pressure.

[0155] Specifically, the control module 103 first filters the pressure simulation signal based on the Korotkoff signal, retains the pressure simulation signal corresponding to the collection time of the Korotkoff signal, and converts the Korotkoff signal and the pressure simulation signal corresponding to the Korotkoff signal to obtain air pressure data and blood pressure values, to ensure that the time of the obtained blood pressure data and the subsequent processing of the Korotkoff data corresponds. That is, the air pressure data is obtained by converting the filtered pressure simulation signal, and the format of the air pressure data is adapted to the format that the display module can recognize.

[0156] For example, the filtered pressure simulation signal is input into the ADC, and the output of the ADC can be directly determined as the blood pressure data, or the blood pressure data can be determined based on the output of the ADC and the above formula (2).

[0157] In step S1004, the Korotkoff sound data is obtained according to the Korotkoff sound signal.

[0158] The Korotkoff sound data is the converted Korotkoff sound signal, and the format of the Korotkoff sound data is adapted to the format that can be recognized by the audio output module.

[0159] For example, the Korotkoff sound signal is input into the ADC, and the output of the ADC can be directly determined as the Korotkoff sound data, or the output of the ADC after time-frequency conversion, amplification, frequency shift, frequency-time conversion and amplification processing can be determined as the Korotkoff sound data.

[0160] In step S1005, in response to the playback operation, the Korotkoff sound and the air pressure are synchronously played back and the systolic pressure and diastolic pressure are displayed according to the Korotkoff sound data and the air pressure data.

[0161] The blood pressure measurement method provided in the embodiment can identify the Korotkoff sound to obtain the blood pressure value and play back the Korotkoff sound to determine whether the blood pressure value is accurate. After the pressure simulation signal and the brachial artery pulsation signal are obtained, the Korotkoff sound signal is identified from the brachial artery pulsation signal, then the blood pressure data is determined based on the Korotkoff sound signal and the pressure simulation signal, the Korotkoff sound data is determined based on the Korotkoff sound signal, the pressure data is obtained based on the pressure simulation signal, and the air pressure data corresponding to the occurrence of the Korotkoff sound in the blood pressure data and the air pressure data corresponding to the disappearance of the Korotkoff sound are taken as the blood pressure measurement result. The accuracy of the determined Korotkoff sound data and the air pressure data corresponding to the Korotkoff sound data can be improved, more accurate original measurement data for determining the blood pressure value is provided through the playback operation, and the accuracy of the blood pressure measurement is further improved. The playback of the Korotkoff sound provides the user with the Korotkoff sound data consistent with the artificial auscultation method, which verifies the blood pressure value and analyzes the blood pressure measurement process of the user, and further provides the original data for the analysis of the disease.

[0162] Specifically, when the user performs the playback operation (for example, presses the playback button with a preset action), the control module controls the audio output module to play back the Korotkoff sound according to the Korotkoff sound data read from the storage module in response to the playback operation, and controls the display module to synchronously play back the air pressure according to the blood pressure data corresponding to the Korotkoff sound data read from the storage module and display the blood pressure value at the same time. The Korotkoff sound played by the audio output module corresponds to the air pressure displayed by the display module.

[0163] In the embodiment, after the blood pressure measurement is performed, the Korotkoff sound in the measurement process and the air pressure value corresponding to the Korotkoff sound in the measurement process can be played back at any time, and the blood pressure value is displayed, which facilitates the medical staff to view and analyze the collected data multiple times, and further accurately determine the blood pressure of the user, and helps the medical staff to more accurately determine whether there is a phenomenon such as arrhythmia or atrial fibrillation.

[0164] For example, in order to ensure that the played Korsh sound and the displayed air pressure correspond, after the user triggers the playback operation, the blood pressure measurement method further includes steps c1 to c5:

[0165] Step c1, determining the playback data segment and the playback time segment based on the pressure simulation signal and the Korsh sound signal.

[0166] The playback data segment includes the Korsh sound playback data segment and the blood pressure playback data segment, and the playback time segment is the time segment for synchronous playback of the Korsh sound data and the blood pressure data.

[0167] Specifically, the playback time segment T3 is the difference between the playback end time T2 of the Korsh sound playback and the playback start time T1 of the Korsh sound playback, i.e. T3 = T2-T1, and the playback end time T2 of the Korsh sound playback and the playback start time T1 of the Korsh sound playback are determined based on the playback data segment.

[0168] When the Korsh sound playback data segment contains Korsh sound data between the Nth second before the Korsh sound data start time and the Mth second after the Korsh sound data disappearance time, the playback end time is the Mth second after the Korsh sound data disappearance time, and the playback start time is the Nth second before the Korsh sound data start time.

[0169] Step c2, determining the audio playback sequence number of the Korsh sound playback based on the playback time segment and the audio playback frequency.

[0170] Specifically, the audio playback sequence number can be the product of the playback time segment T3 and the audio playback frequency f2, i.e. the audio playback sequence number is (T3 x f2).

[0171] Step c3, determining the air pressure playback sequence number of the air pressure playback based on the playback time segment and the pressure sampling frequency.

[0172] Specifically, the air pressure playback sequence number can be the product of the playback time segment T3 and the pressure sampling frequency f1, i.e. the air pressure playback sequence number is (T3 x f1).

[0173] The audio playback sequence number and the air pressure playback sequence number are used to establish the correspondence between the Korsh sound data and the blood pressure data at the same time in the playback time segment based on the playback time segment.

[0174] Step c4, reading the Korsh sound data from the storage module based on the audio playback sequence number.

[0175] Step c5, reading the blood pressure data corresponding to the Korsh sound data from the storage module based on the air pressure playback sequence number.

[0176] Specifically, the audio playback sequence number and the air pressure playback sequence number corresponding to the specific playback time are determined based on the playback time period, and then data is read from the storage module based on the audio playback sequence number and the air pressure playback sequence number, so as to ensure that the read Korotkoff sound data and pressure data are corresponding.

[0177] For example, after the control module receives the playback signal, the process of playing the Korotkoff sound and displaying the blood pressure can be as shown in FIG. 11. First, the control module determines the playback start time T1 of the Korotkoff sound playback and the playback end time T2 of the Korotkoff sound playback, and then determines the playback time period T3 based on T1 and T2.

[0178] Then, the audio playback sequence number of the Korotkoff sound playback is determined based on the playback time period and the audio playback frequency, and the air pressure playback sequence number of the air pressure playback is determined based on the playback time period and the pressure sampling frequency. Then, the Korotkoff sound data is read from the storage module based on the audio playback sequence number, and the air pressure data corresponding to the Korotkoff sound data is read from the storage module based on the air pressure playback sequence number. Then, the Korotkoff sound is played based on the read Korotkoff sound data by controlling the audio output module, and the air pressure is displayed based on the read air pressure data by controlling the display module, and the corresponding air pressure is identified as the systolic pressure when the Korotkoff sound appears and is displayed, and the corresponding air pressure is identified as the diastolic pressure when the Korotkoff sound disappears and is displayed. The audio playback sequence number and the air pressure playback sequence number establish the corresponding relationship between the Korotkoff sound data and the blood pressure data at the same time in the playback time period based on the playback time period.

[0179] In this embodiment, a blood pressure measurement method is provided, which can be used for the control module 103 described above. FIG. 12 is a flowchart of another blood pressure measurement method according to an embodiment of the present disclosure. As shown in FIG. 12, the method includes the following steps:

[0180] In step S1201, the pressure simulation signal and the brachial artery pulsation signal are obtained.

[0181] For details, please refer to step S1001 of the embodiment shown in FIG. 10, which will not be repeated here.

[0182] In step S1202, the brachial artery pulsation signal is identified to obtain the Korotkoff sound signal.

[0183] For details, please refer to step S1002 of the embodiment shown in FIG. 10, which will not be repeated here.

[0184] In step S1203, the pressure simulation signal and the Korotkoff sound signal are processed to obtain blood pressure data, which includes the air pressure and blood pressure values in the air bag pressure reduction process.

[0185] For details, please refer to step S1003 of the embodiment shown in FIG. 10, which will not be repeated here.

[0186] Step S1204, obtaining the Korotkoff sound data according to the Korotkoff sound signal.

[0187] Specifically, the step S1204 includes:

[0188] Step S12041, converting the Korotkoff sound signal into a Korotkoff sound digital signal.

[0189] Specifically, the brachial artery pulsation signal can be converted into the Korotkoff sound digital signal through an ADC chip or an ADC interface of an MCU.

[0190] It should be understood that the pressure analog signal can also be converted into a pressure digital signal through an ADC chip or an ADC interface of an MCU.

[0191] Step S12042, performing time-frequency conversion processing on the Korotkoff sound digital signal to obtain a first frequency domain feature.

[0192] Specifically, the Korotkoff sound digital signal is subjected to FFT to convert the Korotkoff digital signal into the first frequency domain feature.

[0193] Step S12043, performing amplification processing on the first frequency domain feature to obtain a second frequency domain feature.

[0194] Specifically, the first frequency domain feature can be subjected to amplification processing through an operational amplifier to obtain the second frequency domain feature. The amplification multiple is greater than or equal to 10, for example, the amplification multiple can be 10, 20, 50, 80 or 100, etc.

[0195] Step S12044, shifting the second frequency domain feature by a preset frequency as a whole to obtain a third frequency domain feature.

[0196] Step S12045, performing frequency-time conversion processing on the third frequency domain feature to obtain a first time domain feature.

[0197] Specifically, the third frequency domain feature is subjected to IFFT to convert the third frequency domain feature into the first time domain feature.

[0198] Step S12046, performing amplification processing on the first time domain feature to obtain the Korotkoff sound data.

[0199] Specifically, the first time domain feature can be subjected to amplification processing through the above formula (1) to further obtain the Korotkoff sound data.

[0200] Further, in some optional embodiments, after the step S12041 and before the step S12042, the blood pressure measuring method further includes: performing denoising processing on the Korotkoff sound digital signal to obtain a denoised Korotkoff sound digital signal. At this time, the step S12042 specifically includes: performing time-frequency conversion processing on the denoised Korotkoff sound digital signal to obtain the first frequency domain feature.

[0201] Specifically, the click sound digital signal can be denoised by a notch filter to filter out the 50Hz power frequency interference in the click sound digital signal, and improve the accuracy of the click sound data obtained based on the click sound digital signal.

[0202] In step S1205, the blood pressure data and the click sound data are stored in the storage module.

[0203] In step S1206, in response to the playback operation, the click sound data and the blood pressure data are synchronously played back, and the blood pressure data includes the air pressure and the blood pressure value in the airbag pressure reduction process.

[0204] For details, please refer to step b2 of the above embodiment, which will not be repeated here.

[0205] In some optional embodiments, after determining the click sound data and the air pressure data and before performing the playback operation, the blood pressure measurement method further includes: determining a blood pressure measurement result based on the air pressure data and the click sound data, and controlling the display module to display the blood pressure measurement result.

[0206] The blood pressure measurement result includes a low pressure signal and a high pressure signal to measure high blood pressure and low blood pressure. The high pressure signal refers to the blood pressure value corresponding to the first sound click in the blood pressure measurement process, i.e., the systolic pressure, and the low pressure signal refers to the blood pressure value corresponding to the disappearance or appearance of the click in the blood pressure measurement process, i.e., the diastolic pressure. Therefore, the blood pressure data of the present embodiment includes the blood pressure value as the blood pressure measurement result and the air pressure in the airbag pressure reduction process, and the synchronous playback of the click sound and the blood pressure data includes the synchronous playback of the click sound, the air pressure in the airbag pressure reduction process, and the simultaneous display of the blood pressure value.

[0207] The blood pressure measurement method provided in the present embodiment can improve the poor response of the audio output module caused by the fact that the sound frequency of the click sound contains a large number of low frequency components, and improve the playback effect of the audio output module after the click sound signal is converted into the click sound digital signal, the click sound digital signal is subjected to time-frequency conversion, amplification, frequency shift, frequency-time conversion and amplification.

[0208] In the present embodiment, a blood pressure measurement method is provided, which can be used for the control module 103 described above. FIG. 13 is a flow diagram of another blood pressure measurement method according to an embodiment of the present disclosure. As shown in FIG. 13, the method includes the following steps:

[0209] In step S1301, the pressure simulation signal and the brachial artery pulsation signal are obtained.

[0210] For details, please refer to step S1001 of the embodiment shown in FIG. 10, which will not be repeated here.

[0211] In step S1302, the storage time period is determined based on the storage space of the storage module.

[0212] In some embodiments, when the storage space of the storage module is greater than the preset storage space, the time length between the collection time of the first pressure simulation signal of the airbag pressure reduction process and the collection time of the last pressure simulation signal is determined as the storage time period. That is, when the storage space of the storage module is greater than the preset storage space, the time period between the start of collection by the air pressure sensor 101 and the termination of collection is determined as the storage time period.

[0213] Specifically, the preset storage space is the space required to store all blood pressure data and Korotkoff sound data in a first time period, and the first time period is the average length of time to complete blood pressure measurement.

[0214] In this embodiment, all measurement data can be stored, ensuring data integrity and avoiding data omission.

[0215] In other embodiments, when the storage space of the storage module is less than or equal to the preset storage space, the time length between the Nth second before the start time of the Korotkoff sound data and the Mth second after the disappearance time of the Korotkoff sound data is determined as the storage time period, where N≥1 and M≥1, and N and M can be the same or different. That is, the storage time period and the length of the playback data period described above are consistent, and the storage time period is the playback time period described above.

[0216] For example, N and M can each be 1s, 2s, or 3s, etc. Taking the case where N and M are both 2s as an example, the storage time period is the time length between the first 2s before the first Korotkoff sound and the last 2s after the last Korotkoff sound.

[0217] In this embodiment, only the measurement data between the first time and the second time can be stored, reducing the amount of data and saving storage space.

[0218] In step S1303, the brachial artery pulsation signal in the storage time period is identified to obtain the Korotkoff sound signal.

[0219] For details, see step S1002 of the embodiment shown in FIG. 10, which will not be described here.

[0220] In step S1304, the pressure simulation signal and the Korotkoff sound signal in the storage time period are processed to obtain the blood pressure data in the storage time period.

[0221] For details, see step S1003 of the embodiment shown in FIG. 10, which will not be described here.

[0222] In step S1305, the Korotkoff sound data is obtained according to the Korotkoff sound signal.

[0223] For details, see step S1204 of the embodiment shown in FIG. 12, which will not be described here.

[0224] Step S1306, store the blood pressure data and the Korotkoff sound data in a storage period to a storage module.

[0225] Step S1307, in response to a playback operation, synchronously play the Korotkoff sound data and the air pressure data of the Korotkoff sound and air bag pressure reduction process, and simultaneously display the blood pressure value.

[0226] For details, please refer to step b2 of the above embodiment, which will not be repeated here.

[0227] Step S1308, when the audio output module plays the first Korotkoff sound, the display module is controlled to synchronously display the pulse icon.

[0228] For example, the display interface containing the pulse icon can be as shown in FIG. 9.

[0229] The blood pressure measurement method provided in the embodiment determines the storage period before processing the pressure simulation signal and the brachial artery pulse signal, can flexibly adjust the length of the stored data, and avoids the un-stored situation. When the audio output module plays the first Korotkoff sound or before the first Korotkoff sound appears for S seconds, S≥1 second, the display module is controlled to synchronously display the pulse icon, which can more accurately assist medical personnel to determine the actual blood pressure of the user.

[0230] In the embodiment, a control module is also provided, which is used to implement the above embodiments and optional implementation manners, and will not be repeated here. As used below, the term “module” can be a combination of software and / or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware is also possible and is contemplated.

[0231] The control module in the embodiment is presented in the form of a functional unit, where the unit refers to an Application Specific Integrated Circuit (ASIC), a processor and a memory executing one or more software or fixed programs, and / or other devices that can provide the above functions.

[0232] The disclosure also provides an electronic device, wherein the host 200 in the above can be the electronic device.

[0233] As shown in FIG. 14, the electronic device includes one or more processors 310, a memory 320, and a communication interface 330 for connecting the components, the communication interface 330 including a high-speed interface and a low-speed interface. The components are communicatively connected with each other using different buses, and can be mounted on a common main board or otherwise mounted as needed. The processor can process instructions executed within the electronic device, including instructions stored in the memory or on the memory to display a GUI on an external input / output device such as a display device coupled to the interface. In some alternative embodiments, a plurality of processors and / or buses can be used with a plurality of memories, if necessary. Also, a plurality of electronic devices can be connected, each device providing part of the necessary operations (e.g., as a server array, a set of blade servers, or a multi-processor system). One processor 310 is exemplified in FIG. 14. The processor 310 corresponds to the control module 103 described above, and the memory 320 corresponds to the storage module 104 described above.

[0234] In the description of the present specification, the description of the terms "the present embodiment", "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0235] Although the embodiments of the present disclosure are described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and such modifications and changes fall within the scope defined by the present disclosure.

Claims

1. A blood pressure measuring device with a click sound recognition and playback function, characterized by, The blood pressure measuring device comprises a control module, an air pressure sensor and a vibration sensor; The air pressure sensor is configured to collect a pressure analog signal, which is used to represent the air pressure in the air bag; The vibration sensor is fixed in the cuff and configured to collect a brachial artery pulsation signal; The control module is configured to control the air pressure in the air bag, identify Korotkoff sounds in the brachial artery pulsation signal collected by the vibration sensor, obtain systolic pressure data and diastolic pressure data according to the Korotkoff sounds and the air pressure in the air bag, and display the air pressure drop process, the occurrence and end process of the Korotkoff sounds, and the systolic pressure data and the diastolic pressure data in response to a playback operation.

2. The blood pressure measuring device according to claim 1, characterized in that, The vibration sensor is a piezoelectric sensor or a microphone.

3. The blood pressure measuring device according to claim 1, characterized in that, The playback of the air pressure drop process in the air bag is realized by digital display, and the playback of the occurrence and end process of the Korotkoff sounds is realized by a sound player and / or by the beating of a heartbeat graphic symbol on the display screen.

4. The blood pressure measuring device according to any one of claims 1 to 3, characterized in that, The control module is further configured to send the Korotkoff sounds, the air pressure in the air bag, and the systolic pressure data and the diastolic pressure data, as well as the corresponding measurement time, to an external device for storage and playback.

5. The blood pressure measuring device according to claim 4, characterized in that, The playback operation comprises selecting blood pressure measurement data to be played back for playback operation.

6. A blood pressure measuring apparatus characterized by comprising: The blood pressure measuring device comprises an air pressure sensor, a piezoelectric sensor and a control module; The air pressure sensor is configured to collect a pressure analog signal, which is used to represent the air pressure in the air bag; The piezoelectric sensor is fixed in the cuff and configured to collect a brachial artery pulsation signal; The control module is configured to obtain the pressure analog signal and the brachial artery pulsation signal, identify Korotkoff sounds in the brachial artery pulsation signal, obtain Korotkoff sound data according to the Korotkoff sounds, process the pressure analog signal and the Korotkoff sound data to obtain blood pressure data, and display the systolic pressure and the diastolic pressure in response to a playback operation. The control module is further configured to perform synchronous playback of the Korotkoff sounds and the air pressure and display the systolic pressure and the diastolic pressure in response to a playback operation. The air pressure sensor and the piezoelectric sensor are respectively connected in communication with the control module.

7. The blood pressure measuring device according to claim 6, characterized in that The blood pressure measuring device further comprises a storage module, an audio output module and a display module; The control module is further configured to store the Korotkoff sound data and the blood pressure data in the storage module, control the audio output module to play back the Korotkoff sounds read from the storage module, and control the display module to play back the air pressure and display the blood pressure value corresponding to the Korotkoff sound data read from the storage module; and the storage module, the audio output module and the display module are respectively connected in communication with the control module.

8. The blood pressure measuring device according to claim 7, characterized in that, The control module is configured to determine a playback data segment and a playback time segment based on the pressure analog signal and the Korotkoff signal; the playback data segment comprises a data segment of the Korotkoff playback and a data segment of the blood pressure playback, and the playback time segment is a time segment of synchronous playback of the Korotkoff data and the blood pressure data.

9. The blood pressure measuring device according to claim 7, characterized in that, The control module is configured to determine an audio playback sequence number of the Korotkoff playback based on the playback time segment and an audio playback frequency of the Korotkoff, and determine a blood pressure playback sequence number of the blood pressure playback based on the playback time segment and a pressure sampling frequency of the blood pressure.

10. The blood pressure measuring device according to claim 8, characterized in that, The data segment of the Korotkoff playback comprises Korotkoff data between N seconds before a Korotkoff data starting moment and M seconds after a Korotkoff data disappearing moment, the data segment of the blood pressure playback is blood pressure data corresponding to the data segment of the Korotkoff playback, and the playback time segment is consistent with a time length of the playback data segment; N is greater than or equal to 1, and M is greater than or equal to 1.

11. The blood pressure measuring device according to claim 8, characterized in that, The playback time segment is a difference between a playback ending moment of the Korotkoff playback and a playback starting moment of the Korotkoff playback, the playback ending moment is M seconds after the Korotkoff data disappearing moment, and the playback starting moment is N seconds before the Korotkoff data starting moment, N is greater than or equal to 1, and M is greater than or equal to 1.

12. The blood pressure measurement device of claim 6, wherein, The control module is further configured to set an identification threshold of the Korotkoff signal according to a comparison result of an average value of the brachial artery pulsation signal in a preset time segment and a preset threshold, and identify the Korotkoff signal according to the identification threshold.

13. The blood pressure measurement device of claim 12, wherein, The control module is further configured to perform a band-pass filtering process on the brachial artery pulsation signal in a preset frequency range to obtain an artery intensity signal, obtain a numerical difference between a maximum value and a minimum value of the artery intensity signal in a preset collection time segment each time, and take the numerical difference as an artery signal intensity each time, obtain an average value of all the artery signal intensities to obtain an average value of the artery signal intensity, and set the identification threshold of the Korotkoff signal according to a comparison result of the average value of the artery signal intensity, a first preset threshold and a second preset threshold.

14. The blood pressure measuring device according to claim 13, characterized in that, The control module is configured to set the identification threshold of the Korotkoff signal as a first identification threshold when the average value of the artery signal intensity is less than the first preset threshold, set a second identification threshold of the Korotkoff signal as P times the average value of the artery signal intensity when the average value of the artery signal intensity is greater than the second preset threshold, and set a third identification threshold of the Korotkoff signal as 2P times the average value of the artery signal intensity when the average value of the artery signal intensity is between the first preset threshold and the second preset threshold, where P is greater than 0.

15. The blood pressure measurement device of claim 13, wherein, The control module is configured to determine the artery intensity signal greater than the artery intensity signal corresponding to the identification threshold as the Korotkoff signal.

16. The blood pressure measuring device according to any one of claims 6 to 15, characterized in that, The control module comprises an analog-to-digital conversion unit and a processing unit. The analog-to-digital conversion unit is configured to convert the pressure analog signal into a pressure digital signal, and convert the Korotkoff signal into a Korotkoff digital signal. The processing unit is configured to perform time-frequency conversion on the click sound digital signal to obtain a first frequency domain feature, amplify the first frequency domain feature to obtain a second frequency domain feature, shift the second frequency domain feature by a preset frequency to obtain a third frequency domain feature, perform frequency-time conversion on the third frequency domain feature to obtain a first time domain feature, and amplify the first time domain feature to obtain the click sound data. The processing unit is further configured to process the pressure digital signal and the click sound digital signal based on a calibration parameter to obtain the blood pressure data.

17. The blood pressure measuring device according to claim 16, wherein The processing unit is configured to determine a storage time period based on a storage space of the storage module.

18. The blood pressure measuring device according to claim 17, wherein The processing unit is configured to, when the storage space of the storage module is greater than a preset storage space, determine a time length between a collection time of the first pressure analog signal and a collection time of the last pressure analog signal as the storage time period.

19. The blood pressure measuring device according to claim 17, wherein The processing unit is configured to, when the storage space of the storage module is less than or equal to the preset storage space, determine a time length between an Nth second before a click sound data starting time and an Mth second after a click sound data disappearing time as the storage time period, wherein the N is greater than or equal to 1, the M is greater than or equal to 1, the storage time period is a playback time period, the playback time period is a time period for synchronously playing back the click sound data and the blood pressure data, and a playback data segment includes a data segment for playing back the click sound and a data segment for playing back the blood pressure.

20. The blood pressure measurement device of claim 15, wherein, The control module further includes a control unit. The control unit is configured to control the display module to synchronously display a pulse icon when the audio output module plays the first sound click sound.

21. The blood pressure measurement device of claim 15, wherein, The blood pressure measuring device further includes a playback button, and the playback button is connected to the control module. The playback button is configured to generate a playback signal based on a preset action, so that the control module responds to a playback operation.

22. A method of blood pressure measurement, characterized by, The method includes: acquiring a pressure analog signal and a brachial artery pulsation signal; identifying the brachial artery pulsation signal to obtain a click sound signal, and obtaining click sound data based on the click sound signal; processing the pressure analog signal and the click sound signal to obtain blood pressure data, the blood pressure data including air pressure in a deflation process of an air bag and blood pressure values, the blood pressure values being systolic pressure and diastolic pressure; in response to a playback operation, synchronously playing back the click sound data and the air pressure data, and displaying the systolic pressure and the diastolic pressure.

23. The method of claim 22, wherein, The identification of the brachial artery pulsation signal to obtain the click sound signal includes: setting an identification threshold of the click sound signal based on a comparison result of an average arterial signal intensity of the brachial artery pulsation signal in a preset time period and a preset threshold; identifying the click sound signal based on the identification threshold.

24. The method of claim 23, wherein, The recognition threshold for Korotkoff sounds is set based on a comparison between the average arterial signal intensity of the brachial artery pulsation signal over a preset time period and a preset threshold, including: The brachial artery pulsation signal is bandpass filtered within a preset frequency range to obtain the arterial intensity signal; The difference between the maximum and minimum values ​​of the arterial intensity signal within a preset acquisition time period is obtained each time, and the difference is used as the arterial signal intensity for each time. The average value of the arterial signal intensity for all occurrences is obtained to obtain the mean arterial signal intensity. The recognition threshold for Korotkoff sound signals is set based on the comparison result of the mean arterial signal intensity, the first preset threshold, and the second preset threshold.

25. A blood pressure measurement method with click recognition and playback, characterized by, The method includes: Acquire pressure simulation signals and brachial artery pulsation signals during the pressure drop process inside the airbag; The brachial artery pulsation signal is identified to obtain Korotkoff sound signals; The pressure simulation signal is processed to obtain the air pressure during the air pressure drop process inside the airbag; The pressure simulation signal and the Korotkoff sound signal are processed to obtain systolic blood pressure data and diastolic blood pressure data; In response to the playback operation, the process of the air pressure drop inside the airbag, the appearance and end of the Korotkoff sound, and the display of the systolic blood pressure data and the diastolic blood pressure data are played back synchronously.

26. An electronic device, comprising: include: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method of any one of claims 22 to 25.

27. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method of any one of claims 22 to 25.

28. A computer program product, characterised in that, Includes computer instructions for causing a computer to perform the method of any one of claims 22 to 25.

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