Blood pressure measurement method, system, electronic device, and medium

Abstract

The application relates to the field of blood pressure measurement, and discloses a blood pressure measurement method, a blood pressure measurement system, an electronic device and a medium. The blood pressure measurement method of the application, in the blood pressure measurement pressure raising stage, detects the real-time air pressure value of the air path connected with the air bag, and then controls the air valve driving circuit according to the real-time air pressure value. For example, when the air bag air pressure is low, a small driving voltage is used to drive the air valve to work, and when the air bag air pressure is high, a large driving voltage is used to drive the air valve to work. In this way, the driving voltage of the air valve is dynamically adjusted during the pressure raising process, compared with the mode of using a fixed high driving voltage to drive the air valve to work, the air valve can complete the work with small power consumption under the condition of guaranteeing the air leakage amount requirement, thus the power consumption consumed in each blood pressure measurement process is optimized, the overall power consumption of the blood pressure measurement system is reduced, the endurance of the wearable device is improved, and the long-term blood pressure monitoring goal is finally achieved.

Description

Technical Field

[0001] This application relates to the field of blood pressure measurement technology, and in particular to a blood pressure measurement method, system, electronic device and medium. Background Technology

[0002] Currently, with the continuous development of technology, wearable devices have become an integral part of people's lives. People are no longer satisfied with simply monitoring time and steps; they want to use wearable devices to monitor their health indicators. For example, blood pressure is a basic physiological indicator and an important basis for assessing various diseases; therefore, wearable devices typically integrate blood pressure measurement systems. Unlike traditional cuff blood pressure monitors, wearable blood pressure measurement devices have higher requirements for size and power consumption.

[0003] Existing wearable blood pressure measurement devices, such as wrist blood pressure monitors, while achieving small size, are significantly limited by battery capacity and battery life, making it difficult to achieve long-term continuous monitoring. Therefore, it is essential to reduce the power consumption of wearable blood pressure measurement devices and achieve long or even ultra-long battery life. Summary of the Invention

[0004] This application provides a blood pressure measurement method, system, electronic device, and medium.

[0005] In a first aspect, embodiments of this application provide a blood pressure measurement method applied to an electronic device. The electronic device includes an air bladder and an air valve for measuring blood pressure. The method includes: the electronic device entering a pressurization phase for blood pressure measurement and acquiring a real-time air pressure value inside the air bladder; determining a real-time driving voltage for the air valve based on the real-time air pressure value and a first deflation condition; and driving the air valve to operate based on the real-time driving voltage.

[0006] Understandably, in the pressurization phase of blood pressure measurement, this application detects the real-time air pressure value inside the cuff using a sensor, and then controls the valve drive circuit based on this real-time air pressure value, ensuring that the real-time drive voltage applied to the valve corresponds to the real-time air pressure value. For example, when the cuff pressure is low, a smaller drive voltage can be used to drive the valve, and when the cuff pressure is high, a larger drive voltage can be used. The real-time drive voltage can be the minimum drive voltage required for the valve to meet the first deflation condition (e.g., deflation volume is 0). Thus, by dynamically adjusting the valve drive voltage during pressurization, the valve can operate with minimal power consumption while meeting the first deflation condition. By optimizing the power consumption during each blood pressure measurement, the battery life of the electronic device can be improved, achieving the goal of long-term blood pressure monitoring.

[0007] In one possible implementation of the first aspect above, determining the real-time driving voltage of the air valve based on the real-time air pressure value and the first venting condition includes: obtaining the correspondence between the air valve voltage and the airbag pressure when the first venting condition is that the venting amount of the air valve is less than or equal to the first venting amount; determining the air valve voltage corresponding to the real-time air pressure value based on the correspondence between the air valve voltage and the airbag pressure; and determining the air valve voltage corresponding to the real-time air pressure value as the real-time driving voltage of the air valve.

[0008] The first deflation amount can be 0 or a value infinitely close to 0. A deflation amount of less than or equal to 0 can be understood as the valve not deflating. To ensure the valve does not deflate, the relationship between the valve voltage and the cuff pressure is obtained. This relationship indicates the valve voltage corresponding to different cuff pressures; this voltage is the minimum required to prevent valve deflation. Therefore, the valve voltage corresponding to the real-time pressure value can be directly determined from the relationship between the valve voltage and cuff pressure, and then used as the real-time driving voltage for the valve. In this way, during the pressurization phase of blood pressure measurement, the valve can operate with lower power while ensuring it does not deflate, thus reducing the power consumption of the blood pressure measurement process.

[0009] In one possible implementation of the first aspect mentioned above, the relationship between the valve voltage and the airbag pressure shows that the valve voltage first decreases and then increases as the airbag pressure increases.

[0010] Considering that when the airbag pressure is low, the valve only requires a small magnetic force to block the vent hole to prevent system leakage, while a larger magnetic force is needed when the airbag pressure is high, the valve voltage initially decreases and then increases as the airbag pressure increases. Therefore, by dynamically adjusting the valve's drive voltage, ensuring it decreases initially and then increases, the power loss of the valve during the initial inflation phase can be reduced, thus lowering the overall power consumption of the blood pressure measurement system.

[0011] In practice, when calibrating the relationship between the valve voltage and the airbag pressure, a curve representing the relationship between the valve voltage and the airbag pressure can be obtained by curve fitting.

[0012] In one possible implementation of the first aspect above, determining the real-time driving voltage of the air valve based on the real-time air pressure value and the first venting condition includes: obtaining the real-time ideal air pressure value of the airbag when the first venting condition is that the venting amount of the air valve is greater than the second venting amount; the real-time ideal air pressure value characterizes the air pressure value corresponding to the airbag satisfying the linear pressurization condition; and determining the real-time driving voltage of the air valve based on the real-time deviation value between the real-time ideal air pressure value and the real-time air pressure value.

[0013] Understandably, linear inflation of the air bladder helps improve the accuracy of blood pressure measurement. This application controls the release of air by adjusting the real-time driving voltage of the air valve, thus ensuring the air bladder meets the linear inflation condition. Therefore, the second release volume can be 0 or infinitely close to 0. A release volume greater than 0 can be understood as the air valve's vent opening, allowing air to be released. The release volume is determined by the air valve's driving voltage. A higher driving voltage results in a smaller release volume, and a lower driving voltage results in a larger release volume. With the air valve's vent open, the actual release volume must ensure the air bladder meets the linear inflation condition. Therefore, by using the deviation between the real-time ideal air pressure value when the air bladder meets the linear inflation condition and the actual real-time air pressure value, the driving voltage of the air valve is controlled. This ensures that the air valve operates with low power consumption while maintaining linear inflation of the air bladder under the corresponding real-time driving voltage, thus improving the accuracy of blood pressure measurement.

[0014] In one possible implementation of the first aspect described above, the electronic device further includes an air pump for measuring blood pressure; determining the real-time drive voltage of the air valve based on the real-time ideal air pressure value and the real-time deviation value includes: using a proportional-integral-derivative control algorithm to determine the real-time drive voltage of the air pump and the real-time drive voltage of the air valve based on the real-time deviation value.

[0015] Understandably, the air valve is used to deflate the airbag, while the air pump is primarily used to inflate it. During the pressurization phase, the airbag is inflated by the air pump while simultaneously deflated by the air valve. As mentioned above, the airbag can be linearly pressurized by controlling the amount of deflation from the air valve. In practical applications, the airbag can also be linearly pressurized by simultaneously controlling both the amount of deflation from the air valve and the driving voltage of the air pump. This ensures linear pressurization of the airbag while allowing the air pump to operate at its optimal state, further improving the pump's power and increasing the inflation efficiency of blood pressure measurement.

[0016] In one possible implementation of the first aspect described above, the electronic device further includes a first drive circuit for driving the air pump to operate; the method further includes controlling the drive voltage of the air pump to be the real-time drive voltage of the air pump via a variable power control chip in the first drive circuit.

[0017] Understandably, the first drive circuit is used to drive the air pump. Through the variable power control chip in the first drive circuit, the drive voltage applied to the air pump can be dynamically adjusted during the boosting phase, ensuring the air pump operates at its optimal state and improving inflation efficiency.

[0018] In one possible implementation of the first aspect above, obtaining the real-time ideal air pressure value of the airbag includes: obtaining a linear pressure rise curve; the linear pressure rise curve includes ideal air pressure values ​​corresponding to different times; and determining the ideal air pressure value corresponding to the current time based on the linear pressure rise curve to obtain the real-time ideal air pressure value.

[0019] In one possible implementation of the first aspect described above, the electronic device further includes a sensor connected to the airway of the airbag; acquiring the real-time air pressure value inside the airbag includes: detecting the air pressure inside the airbag through the sensor to obtain the real-time air pressure value.

[0020] Understandably, during the pressurization phase, in order to obtain accurate real-time air pressure values ​​in a timely manner and to dynamically adjust the air valve voltage, the sensor can send the detected air pressure values ​​to the processor in real time.

[0021] Among them, the sensor can be a differential pressure sensor, which can directly detect the difference between the air pressure inside the airbag and the air pressure outside the airbag (i.e., atmospheric pressure). This difference can more intuitively reflect the degree of airbag inflation.

[0022] In one possible implementation of the first aspect described above, the electronic device further includes a second drive circuit for driving the air valve to operate; driving the air valve to operate according to a real-time drive voltage includes: controlling the drive voltage of the air valve to a real-time drive voltage through a variable power control chip in the second drive circuit, so that the air leakage amount of the air valve meets a first leakage condition.

[0023] Understandably, the second drive circuit is used to drive the air valve. Through the variable power control chip in the second drive circuit, the drive voltage applied to the air valve can be dynamically adjusted during the boost phase, allowing the air valve to either prevent leakage with minimal power consumption, or to leak air according to the required amount.

[0024] Secondly, embodiments of this application provide a blood pressure measurement system, including an air bladder, an air valve, and a blood pressure measuring device; the blood pressure measuring device is configured to perform a pressurization phase of blood pressure measurement, acquire a real-time air pressure value inside the air bladder; determine a real-time driving voltage for the air valve based on the real-time air pressure value and a first deflation condition; and drive the air valve to operate based on the real-time driving voltage.

[0025] Thirdly, embodiments of this application provide a readable medium storing instructions that, when executed on an electronic device, cause the electronic device to perform the blood pressure measurement method of the first aspect described above.

[0026] Fourthly, embodiments of this application provide an electronic device, which includes: a memory for storing instructions executed by one or more processors of the electronic device, and a processor, which is one of the processors of the electronic device, for performing the blood pressure measurement method of the first aspect described above. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a wristband device provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the relationship curve between airbag pressure and air valve voltage provided in the first embodiment of this application;

[0029] Figure 3 This is a schematic flowchart of the first blood pressure measurement method provided in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of a drive voltage control curve provided in an embodiment of this application;

[0031] Figure 5 This is a schematic flowchart of the second blood pressure measurement method provided in the embodiments of this application;

[0032] Figure 6 This is a schematic diagram of the relationship curve between the valve voltage and the airbag pressure provided in the embodiments of this application;

[0033] Figure 7 This is a schematic diagram of a blood pressure measurement and control process provided in an embodiment of this application;

[0034] Figure 8 This is a schematic flowchart of the third blood pressure measurement method provided in the embodiments of this application;

[0035] Figure 9 This is a flowchart of a blood pressure measurement process control provided in an embodiment of this application;

[0036] Figure 10 This is a schematic diagram of a PID control process provided in an embodiment of this application;

[0037] Figure 11 This is a flowchart illustrating a PID control method provided in an embodiment of this application;

[0038] Figure 12 This is a schematic diagram illustrating the trends of the fourth and fifth driving voltages as a function of airbag pressure, provided in an embodiment of this application. Detailed Implementation

[0039] The illustrative embodiments will now be described using terms commonly used by those skilled in the art.

[0040] When measuring blood pressure using wearable devices, the oscillometric method is typically employed. For example, a blood pressure measurement system in a wearable device generally includes an air bladder, an air pump for inflating the air bladder, and an air valve for deflating the air bladder.

[0041] In some embodiments, the blood pressure measurement process is as follows: An airbag is strapped to the area to be measured, such as the wrist. During the pressure-increasing phase of the measurement, the air pump is turned on. Generally, to ensure airtightness, the air valve is closed, for example, by driving the air valve with a preset large fixed driving voltage, which increases the magnetic attraction of the air valve to block the vent hole. Then, the air pump inflates the airbag to pressurize it and block the arterial blood flow. During the pressure-deflating phase of the measurement, the air valve is opened, and the gas in the airbag is slowly released through the air valve, or the air pump and air valve are released simultaneously, so that the pulse wave signal of the human body is transmitted to the airbag chamber, generating pressure fluctuations in the airbag chamber. Finally, by analyzing the pressure fluctuations in the airbag chamber, the user's blood pressure can be obtained.

[0042] People hope to achieve long-term blood pressure monitoring by wearing wearable devices. However, due to the size limitations of wearable devices, it is currently difficult to equip them with large-capacity batteries, resulting in poor battery life. Therefore, how to improve the battery life of wearable devices to achieve long-term blood pressure monitoring using the blood pressure measurement system within them is an urgent problem to be solved.

[0043] To improve the battery life of wearable devices, one approach involves controlling the processor's core operating mode and resource allocation. For example, the processor can be put into standby mode during blood pressure measurement intervals, keeping it in a low-power state. Alternatively, the blood pressure measurement interval can be increased, reducing the frequency of measurements and extending the time the processor remains in a low-power state, thus lowering overall power consumption. However, controlling the processor's operating mode only reduces its power consumption. Other components that consume power include the air pump and valves, so this method offers limited optimization for overall power consumption. Furthermore, reducing the frequency of blood pressure measurements hinders the timely detection of abnormal blood pressure readings.

[0044] Therefore, this application provides a blood pressure measurement method for use in a blood pressure measurement system in a wearable device. Specifically, when the airbag pressure is low, the valve only requires a small magnetic force to block the vent hole to ensure the system does not leak. Conversely, when the airbag pressure is high, the valve requires a larger magnetic force to block the vent hole to ensure the system does not leak. Therefore, during the pressurization phase of blood pressure measurement, this method detects the real-time air pressure value of the air path connected to the airbag using a sensor, and then controls the valve drive circuit based on this real-time air pressure value, so that the real-time drive voltage applied to the valve by the valve drive circuit corresponds to the real-time air pressure value of the air path connected to the airbag. For example, when the airbag pressure is low, a smaller drive voltage can be used to drive the valve, and when the airbag pressure is high, a larger drive voltage can be used. This real-time drive voltage can be the minimum voltage that meets the leakage requirements of the blood pressure measurement system (e.g., leakage is 0, i.e., no leakage or leakage is less than a preset threshold) at the real-time air pressure. In this way, by dynamically adjusting the driving voltage of the air valve during the pressurization process, compared with the method of using a fixed higher driving voltage to drive the air valve, the air valve can complete the work with less power consumption while ensuring the required air release volume. Thus, without affecting the blood pressure measurement frequency, by optimizing the power consumption consumed in each blood pressure measurement process, the overall power consumption of the blood pressure measurement system can be reduced, thereby improving the battery life of wearable devices and ultimately achieving the goal of long-term blood pressure monitoring.

[0045] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0046] First, the wearable devices mentioned in this application, depending on the part of the device worn or worn, can include any one of wristband devices (e.g., smartwatches, smart bracelets, etc.), cuff devices, headband devices, and finger-worn devices. The blood pressure measurement method of this application can be applied to any type of wearable device with specific blood pressure measurement function. For ease of description, the following explanation will use a wristband device as an example.

[0047] Figure 1 This is a schematic diagram of a wristband device 100 provided in an embodiment of this application. The blood pressure measurement system can be integrated into the wristband device 100, so that the wristband device 100 has a blood pressure measurement function.

[0048] like Figure 1As shown, the wristband device 100 may include a watch body, which is used to realize the main functions of the wristband device 100, such as display, audio playback, communication, and blood pressure measurement. The blood pressure measurement system may include a processor, drive circuit 1, air pump, sensor, drive circuit 2, air valve, PPG module, and an air bladder connected to the watch body, all integrated in the watch body. The various components in the blood pressure measurement system will be described in detail below, and will not be repeated here. It should be noted that this application does not limit the way the blood pressure measurement system is set in the wearable device. For example, the aforementioned air pump, sensor, and air valve can also be placed outside the watch body according to actual needs; specifically, the sensor can be placed inside the air bladder. The advantage of integrating some components of the blood pressure measurement system inside the watch body is that it can improve the user's wearing comfort.

[0049] Reference Figure 1 The air circuit connects the sensor, air pump, air valve, and airbag. By detecting the air pressure value in the air circuit connected to the airbag through the sensor, the real-time air pressure inside the airbag can be known in real time during blood pressure measurement. In one embodiment, the sensor can be a differential pressure sensor, which can directly detect the difference between the air pressure inside the airbag and the air pressure outside the airbag (i.e., atmospheric pressure). This difference can more intuitively reflect the degree of airbag inflation. Therefore, the real-time air pressure inside the airbag mentioned in this application can be understood as the difference between the air pressure inside the airbag and atmospheric pressure.

[0050] The drive circuit 1 is electrically connected to the air pump and is used to control the working state of the air pump. The drive circuit 1 includes necessary key chips, such as a power control chip for controlling the drive voltage of the air pump, and external RC circuitry to protect the chip and ensure that it is not damaged by excessive current surges within its normal operating range. In one embodiment, the power control chip can be a variable power control chip. A variable power control chip can adjust the magnitude of the air pump's drive voltage, allowing the air pump to operate in the desired state. For example, increasing the air pump's drive voltage can increase the inflation speed of the air bag. Compared to a non-variable power control chip, which can only drive the air pump with a fixed drive voltage, this is less advantageous for adjusting the inflation speed of the air bag. Since controlling the inflation speed is crucial for improving the accuracy of blood pressure measurement, the drive circuit 1 uses a variable power control chip to control the air pump, which helps improve the accuracy of blood pressure measurement.

[0051] Drive circuit 2 is electrically connected to the air valve and is used to control the working state of the air valve. Similar to drive circuit 1, drive circuit 2 also includes necessary key chips, such as a power control chip for controlling the drive voltage of the air valve, and peripheral resistor-capacitor circuits. In one embodiment, the power control chip can be a fixed power control chip, which drives the air valve to work with a fixed drive voltage. Generally, at the beginning of blood pressure measurement, in order to ensure airtightness, a higher fixed drive voltage is used to drive the air valve, causing the air valve to increase magnetic attraction and block the vent. However, since the fixed power control chip can only drive the air valve with a fixed drive voltage, this results in the air valve's drive voltage remaining high throughout the entire pressurization phase, i.e., during the slow rise of the air pressure in the cuff. For example, Figure 2 This is a schematic diagram of the relationship curve between airbag pressure and air valve voltage provided in an embodiment of this application, as shown below. Figure 2 As shown, the valve voltage, i.e., the valve's driving voltage, remains constant. However, when the airbag pressure is low, the valve only requires a small magnetic force to block the vent hole to prevent system leakage. An excessively high driving voltage would lead to wasted power. Therefore, in another embodiment, the power control chip can be a variable power control chip. With this chip, when the airbag pressure is low, the valve is driven with the lowest possible driving voltage while still meeting the system's leakage requirements. This reduces the valve's power consumption.

[0052] A PPG module refers to a functional module that uses photoplethysmography (PPG) to detect health data such as heart rate, blood oxygen, and blood pressure. The PPG detection principle is based on the direct correlation between changes in skin light absorption and changes in arterial blood flow velocity. Therefore, by measuring changes in skin light absorption, changes in arterial blood flow velocity can be deduced, leading to the blood pressure value at a specific time point. Generally, a PPG module includes a light emitter (e.g., a light-emitting diode), a photosensor (e.g., a photodiode), an analog front-end chip, and an accelerometer. The PPG detection process is as follows: light waves are emitted into the skin through the light emitter, changes in light intensity are received by the photosensor, and finally, the analog front-end chip converts the analog signal into a digital signal to obtain the raw PPG signal. The accelerometer, which measures human motion, is used in conjunction with the light signal as input to the PPG algorithm. In the later stages of PPG detection, complex algorithms process the raw signals from the analog front-end chip and accelerometer to generate other biometric data such as heart rate, blood oxygen, and blood pressure. Figure 1The example blood pressure measurement system can measure blood pressure in two different ways: using a PPG module based on photoplethysmography, and using a drive circuit 1, drive circuit 2, air pump, air valve, air bag, and sensor based on oscillometric measurement. While the PPG module allows for air bag-less, non-compression blood pressure measurement, its hardware and software costs are higher, limiting its application compared to the oscillometric method. Therefore, the blood pressure measurement system mentioned below primarily refers to the system using the oscillometric method.

[0053] The processor is electrically connected to drive circuit 1, sensor, drive circuit 2, and PPG module, respectively. Here, the processor can be the processor in the wristband device 100 used to implement the main functions. The processor can receive data sent by any module among drive circuit 1, sensor, drive circuit 2, and PPG module, process the data accordingly, and send relevant instructions to any module. For example, the processor can acquire the real-time air pressure value detected by a sensor (e.g., a differential pressure sensor), determine the minimum drive voltage based on this real-time air pressure value so that the air valve meets the system leakage requirements (e.g., no leakage or zero leakage), and then send a corresponding instruction to drive circuit 2, instructing drive circuit 2 to drive the air valve at this minimum drive voltage. Alternatively, the processor can also send an air pump control instruction to drive circuit 1, instructing drive circuit 1 to control the operating state of the air pump.

[0054] like Figure 1 The wristband device 100 shown may further include a wristband (not shown), with one end of the airbag connected to the watch body and the other end connected to the wristband, so that the airbag can bend and wrap around the user's wrist along with the wristband during measurement. In one embodiment, the airbag is detachably connected to the watch body, so that the airbag can be flexibly installed and removed according to actual user needs.

[0055] It should be noted that, Figure 1 The blood pressure measurement system illustrated includes drive circuit 1 and drive circuit 2, used to control the air pump and air valve, respectively. In practical applications, the number of drive circuits can be designed according to the specific structure of the system. For example, in the case where the system includes multiple air pumps or air valves, a corresponding drive circuit can be provided for each air valve and each air pump. This application does not limit the specific structure of the blood pressure measurement system.

[0056] The following is based on the Figure 1 The description of the wristband device illustrates a specific implementation of a blood pressure measurement method according to this application, which can be executed by a processor in the wristband device.

[0057] The blood pressure measurement method of this application can dynamically adjust the driving voltage of the air valve during the pressurization process, so that the air valve can complete the work with less power consumption. This can optimize the power consumption in each blood pressure measurement process, reduce the overall power consumption of the blood pressure measurement system, thereby improving the battery life of wearable devices and achieving the goal of long-term blood pressure monitoring.

[0058] This application provides three specific embodiments of the blood pressure measurement method. Each specific embodiment is described in detail below.

[0059] First, the implementation method of the first blood pressure measurement method is introduced. In the first implementation method, the processor controls the operation of the air valve with different drive voltages at different times during the voltage boosting process, thereby achieving dynamic adjustment of the drive voltage of the air valve and ensuring that the air valve can complete its operation with low power consumption.

[0060] Figure 3 This is a flowchart illustrating the first blood pressure measurement method provided in the embodiments of this application, as shown below. Figure 3 As shown, blood pressure measurement methods may include:

[0061] S301: At the first moment of the pressurization stage, the driving voltage of the control valve is the first driving voltage.

[0062] The first moment of the pressurization phase can be the start of blood pressure measurement, i.e., the moment the cuff begins to inflate. At this time, the driving voltage for controlling the air valve is the first driving voltage, which must ensure that the air valve does not leak. For example, the first driving voltage can be the maximum voltage within the driving voltage range that ensures the air valve operates normally. Understandably, when inflation begins, the air valve is energized at the maximum voltage to ensure that the leakage path is closed and airtightness is guaranteed.

[0063] As mentioned above, in one implementation, the valve voltage, i.e., the valve's drive voltage, remains constant throughout the pressurization phase. The relevant valve voltage versus airbag pressure curve is shown below. Figure 2 As shown. When the airbag pressure is low, for example, below 5 kPa, the air valve only requires a small magnetic force to block the vent, making leakage less likely. If the air valve voltage is still high (e.g., 3V), it will result in wasted power consumption.

[0064] Based on this, in one embodiment, at the first moment of the pressurization phase, the driving voltage of the control valve is set to a first driving voltage, and simultaneously, the driving duration corresponding to the first driving voltage is set to a first duration. It is understood that the valve operates under the first driving voltage for a first duration, which can be pre-set, for example, a few nanoseconds, a few microseconds, a few milliseconds, or a few seconds. In this way, by increasing the driving voltage of the valve to increase the magnetic attraction and block the vent during the very short time at the start of inflation, the airtightness of the entire blood pressure measurement system can be ensured when the initial inflation pressure is low.

[0065] Accordingly, in one embodiment, the processor can send a first instruction to the drive circuit 2, and the drive circuit 2 responds to the first instruction by starting the drive valve.

[0066] In practical applications, specific driving information, such as the first driving voltage and the first duration, can be carried in the first instruction or pre-programmed into the driving circuit 2. Using the former method, the processor can flexibly modify the driving information each time it sends the first instruction, facilitating adjustments to the first driving voltage or duration to adapt to different blood pressure measurement needs. Using the latter method, since the driving information is pre-programmed into the driving circuit 2, the processor only needs to send a first instruction instructing the driving circuit 2 to start working, without carrying additional driving information. This simplifies the first instruction, speeds up data transmission, and thus improves the efficiency of blood pressure measurement.

[0067] S302: At the second moment of the pressurization phase, the drive voltage of the control valve gradually decreases from the first drive voltage to the second drive voltage.

[0068] The second moment can be understood as the moment after the first duration of the first moment. Starting from the second moment, the initial inflation phase begins. As mentioned above, the air pressure is low during the initial inflation phase, and the air valve only requires a small driving voltage to ensure that the vent hole does not leak air. Therefore, the processor can control the air valve's driving voltage to slowly decrease from the first driving voltage to the second driving voltage during the second moment of the boost phase. Here, the second driving voltage can be the minimum voltage within the driving voltage range that ensures the air valve operates normally. That is, the air valve's driving voltage range is from the second driving voltage to the first driving voltage; within this range, the air valve can operate normally.

[0069] In one implementation, the processor can preset a second duration to limit the time it takes for the voltage to drop from the first driving voltage to the second driving voltage. If the time for the voltage to drop from the first driving voltage to the second driving voltage is too long, that is, if the valve voltage remains high for a long time during the initial inflation phase, the goal of reducing valve power consumption cannot be achieved.

[0070] Accordingly, in one embodiment, the processor can send a second instruction to the drive circuit 2, and the drive circuit 2, in response to the second instruction, lowers the drive voltage of the gas valve.

[0071] In practical applications, specific driving information, such as the second driving voltage and the second duration, can be carried in the second instruction or pre-programmed into the driving circuit 2. The advantages of different methods are explained above and will not be repeated here.

[0072] S303: At the third moment of the pressurization phase, the drive voltage of the control valve gradually increases from the second drive voltage to the third drive voltage.

[0073] The third moment can be understood as the moment after the second duration following the second moment, or the moment when the valve's driving voltage reaches the second driving voltage. From the third moment onwards, the inflation process enters the later stages, with the airbag gradually increasing in pressure to its maximum and expanding to its final shape. To prevent deflation, the valve's driving voltage can be gradually increased to enhance its magnetic force and block the vent. Here, the third driving voltage can be the first driving voltage, i.e., the maximum voltage within the driving voltage range that ensures the valve's normal operation.

[0074] In one implementation, the processor can control the driving voltage of the air valve to gradually increase from a second driving voltage to a third driving voltage at a constant speed. This, combined with the constant inflation rate of the airbag, prevents the air valve from pressurizing too quickly, resulting in wasted power, or from pressurizing too slowly, causing the air valve to leak.

[0075] Accordingly, in one embodiment, the processor can send a third instruction to the drive circuit 2, and the drive circuit 2 responds to the third instruction by increasing the drive voltage of the gas valve.

[0076] In practical applications, specific driving information, such as the third driving voltage and the pressure increase rate of the air valve, can be carried in the third instruction or pre-programmed into the driving circuit 2. The advantages of different methods are explained above and will not be repeated here.

[0077] Through the steps S301 to S303 described above, the processor can control the operation of the air valve with different drive voltages at different times during the boost phase. This achieves dynamic adjustment of the air valve's drive voltage, causing it to decrease first and then increase, thereby reducing power loss during the inflation process and lowering the overall power consumption of the blood pressure measurement system.

[0078] For example, Figure 4This is a schematic diagram of a drive voltage control curve provided in an embodiment of this application. The curve shows the change of the drive voltage at different times during the boost phase. In practical applications, this curve is pre-stored in the processor's memory. During the boost phase, the processor directly reads the curve from memory, thus achieving the following: at the first time (t0), the drive voltage of the control valve is the first drive voltage (V1); at the second time (t1), the drive voltage of the control valve gradually decreases from V1 to the second drive voltage (V2); and at the third time (t2), the drive voltage of the control valve gradually increases from V2 to the third drive voltage (V3). It should be noted again that... Figure 4 The driving voltage control curve shown is merely an example, and this application does not limit it. For example, in other embodiments, V1 may fluctuate between t0 and t1; the process of V1 decreasing to V2 may also be a non-linear decrease; and the process of V2 increasing to V3 may also be a non-linear increase.

[0079] The second blood pressure measurement method is described below. In this second method, as mentioned above, the processor can dynamically adjust the driving voltage of the air valve based on the real-time air pressure inside the air bladder during the pressurization process, ensuring that the air valve can operate with minimal power consumption.

[0080] Figure 5 This is a flowchart illustrating the second blood pressure measurement method provided in this application embodiment, as shown below. Figure 5 As shown, blood pressure measurement methods may include:

[0081] S501: During the pressurization phase, obtain the real-time air pressure value inside the airbag.

[0082] Reference Figure 1 The sensor connected to the airbag's airway is used to detect the air pressure inside the airbag, so that the processor can obtain the real-time air pressure inside the airbag through the sensor.

[0083] In one implementation, a sensor detects the air pressure inside the airbag in real time and then transmits the detected air pressure value to a processor, which receives the real-time air pressure value from the sensor. Understandably, the higher the sensor detection frequency, the more accurate the real-time air pressure value obtained by the processor.

[0084] In another implementation, the sensor does not automatically send the detected air pressure value to the processor. The processor can obtain the current reading from the sensor as the real-time air pressure value when needed.

[0085] In view of the fact that during the pressurization stage, in order to obtain accurate real-time air pressure values ​​in a timely manner and to dynamically adjust the air valve voltage, this application adopts the former implementation method, in which the sensor automatically sends the real-time detected air pressure value to the processor.

[0086] S502: Determine the real-time driving voltage corresponding to the real-time air pressure value based on the relationship curve between the air valve voltage and the airbag pressure.

[0087] In the relevant implementation methods, the following methods are adopted: Figure 2 The curve showing the relationship between the valve voltage and the airbag pressure shows that the valve voltage is fixed and remains high under different airbag pressures, which will result in a waste of valve power when the airbag is under low pressure.

[0088] Therefore, this application defines a new correspondence between valve voltage and airbag pressure. In this correspondence, the valve voltage first decreases and then increases as the airbag pressure increases. The reasons and benefits of this trend can be found in the first embodiment of the blood pressure measurement method above, and will not be repeated here.

[0089] In practical applications, the blood pressure measurement system can be pre-calibrated. Through curve fitting, a curve representing the relationship between valve voltage and cuff pressure can be obtained. The valve voltage corresponding to different cuff pressures on this curve represents the minimum voltage required to prevent valve leakage. Thus, during the pressurization phase, the processor can directly determine the valve voltage corresponding to the real-time pressure value from the valve voltage / cuff pressure curve, using this voltage as the real-time drive voltage.

[0090] In one implementation, the curve showing the relationship between the valve voltage and the airbag pressure can be stored in the processor's memory for quick retrieval by the processor.

[0091] Figure 6 This is a schematic diagram of the relationship curve between the valve voltage and the airbag pressure provided in the embodiments of this application. Figure 6 As shown, during the process of increasing the air pressure of the air valve from 0 to 40 kPa, the air valve voltage is initially at a higher driving voltage (e.g., 3V) to ensure the airtightness of the system at the beginning of inflation. Then, it gradually decreases from 3V to about 1.2V to reduce the power loss of the air valve during the initial inflation phase. Then, as the air pressure of the airbag continues to increase, the air valve voltage gradually rises from 1.2V until it reaches 3V. This means that by increasing the driving voltage of the air valve, the magnetic attraction force of the air valve is increased, preventing air leakage through the vent. It should be noted that... Figure 6 The specific values ​​mentioned are merely examples, and this application does not limit them.

[0092] In this way, after obtaining the real-time air pressure value, the processor can directly determine the corresponding air valve voltage from the relationship curve between the air valve voltage and the airbag pressure, and then use the corresponding air valve voltage as the real-time driving voltage. Thus, the processor can dynamically adjust the air valve voltage, achieving the minimum voltage required to drive the air valve during the pressurization process to prevent system leakage, thereby saving power loss of the air valve when the airbag is under low pressure.

[0093] S503: Drives the air valve according to the real-time drive voltage.

[0094] Reference Figure 1 After the processor determines the real-time drive voltage, it transmits the real-time drive voltage to the drive circuit 2. The drive circuit 2 adjusts the drive voltage of the air valve to the real-time drive voltage through the variable power control chip, thereby realizing the drive of the air valve.

[0095] In one embodiment, each time the processor receives a real-time air pressure value sent by the sensor, it determines the corresponding real-time driving voltage based on the relationship curve between the air valve voltage and the airbag pressure, and then drives the air valve according to the real-time driving voltage.

[0096] In another implementation, the processor stores the real-time air pressure values ​​sent by the sensor. Specifically, the processor can store only the most recently received real-time air pressure value, overwriting previously sent values; or, the processor can store the most recently received real-time air pressure values ​​in chronological order, overwriting previously sent values ​​when the quantity exceeds the limit. Regardless of the storage method, the processor can read the most recently received real-time air pressure value at preset time intervals, and then determine the real-time driving voltage corresponding to the most recently received real-time air pressure value based on the relationship curve between the air valve voltage and the airbag pressure, and drive the air valve according to the real-time driving voltage. The preset time interval can be greater than or equal to the sensor's detection cycle.

[0097] The following is combined Figure 7 The steps S501 to S503 of this application will be described in their entirety. Figure 7 This is a schematic diagram of a blood pressure measurement and control process provided in an embodiment of this application. Figure 7As shown, the differential pressure sensor, airbag, air valve, and air pump are interconnected via air circuits. First, the differential pressure sensor obtains the real-time air pressure value inside the airbag by detecting the air pressure in the air circuit. Then, the differential pressure sensor transmits this real-time air pressure value to the MCU. After receiving the real-time air pressure value, the MCU determines the corresponding real-time drive voltage based on the relationship curve between the air valve voltage and the airbag pressure. This real-time drive voltage is the minimum voltage required to prevent the blood pressure measurement system from leaking under the corresponding real-time air pressure. Then, the MCU controls drive circuit 2, causing drive circuit 2 to supply power to the air valve through its variable power control chip using this real-time drive voltage. In this way, the air valve can maintain good airtightness of the system with relatively low power, thereby reducing the overall power consumption of the blood pressure measurement system.

[0098] It is understood that the first venting condition mentioned in this application, in the second embodiment, can be understood as the situation where the air valve does not vent, or the venting amount of the air valve is less than or equal to the first venting amount, wherein the first venting amount can be 0, or a value infinitely close to 0.

[0099] The third blood pressure measurement method is described below. In this third method, the processor can dynamically adjust the driving voltage of the air valve and the driving voltage of the air pump simultaneously based on the real-time air pressure inside the air bladder during the pressurization process. This not only ensures that the air valve can operate with low power consumption but also guarantees linear pressurization of the air bladder, which is crucial for improving the accuracy of blood pressure measurement.

[0100] Figure 8 This is a flowchart illustrating the third blood pressure measurement method provided in the embodiments of this application, as shown below. Figure 8 As shown, blood pressure measurement methods may include:

[0101] S801: During the pressurization phase, obtain the real-time air pressure value inside the airbag.

[0102] This step can be referred to the implementation method of step S501 above, and will not be repeated here.

[0103] S802: Determine the real-time deviation value based on the real-time air pressure value and the ideal air pressure value.

[0104] The real-time deviation value refers to the pressure difference between the ideal pressure value and the real-time pressure value. The ideal pressure value is the pressure value corresponding to the airbag meeting the linear pressurization condition. As mentioned above, linear pressurization means that the air pressure inside the airbag increases at a constant rate, which can also be understood as the airbag inflating at a constant rate. This constant inflation rate makes the received blood pressure signal more stable, thus helping to improve the accuracy of blood pressure measurement. Understandably, during the pressurization phase, the ideal pressure value of the airbag increases linearly with time.

[0105] In one implementation, to ensure the airbag meets the linear pressurization condition, the processor can store the airbag's linear pressurization curve, which includes ideal pressure values ​​at different times. When determining the real-time deviation value, the processor first needs to determine the ideal pressure value corresponding to the current time from the linear pressurization curve, and then compare this ideal pressure value with the real-time pressure value to obtain the pressure deviation value between the two, which is used as the real-time deviation value.

[0106] S803: Determine the real-time drive voltage of the air pump and the real-time drive voltage of the air valve based on the real-time deviation value.

[0107] In this step, the processor can use a proportional integral derivative (PID) control algorithm to calculate the real-time drive voltage of the air pump (hereinafter referred to as the fourth drive voltage) and the real-time drive voltage of the air valve (hereinafter referred to as the fifth drive voltage) based on the real-time deviation value. Under the adjustment of the fourth and fifth drive voltages, the air pump inflates the airbag with an inflation volume corresponding to the fourth drive voltage, and the air valve deflates the airbag with a deflation volume corresponding to the fifth drive voltage, so that the airbag meets the linear pressure increase condition.

[0108] The amount of air leakage from the air valve is determined by its driving voltage; the higher the driving voltage, the smaller the leakage; the lower the driving voltage, the larger the leakage.

[0109] In one implementation, when the processor calculates the fourth and fifth drive voltages based on the real-time deviation value using PID, it can further consider how to ensure the air pump operates at its optimal state. Operating the air pump at its optimal state further improves inflation efficiency. The air pump's operating state is regulated by the drive circuit 1, which can achieve optimal operation by adjusting air pump operating parameters, such as duty cycle and drive voltage. It should be noted that the setting of air pump operating parameters to achieve optimal operation is determined based on the actual application scenario. This application does not limit the air pump operating parameters, optimal operating state, or specific adjustment methods. For example, the air pump can achieve optimal operation when operating at a preset duty cycle. Therefore, when the processor calculates the fourth and fifth drive voltages based on the real-time deviation value using PID, it first considers the fourth drive voltage required for the air pump to operate at its optimal state, and then, given a fixed inflation volume, considers the fifth drive voltage required for linear inflation of the airbag.

[0110] Understandably, the purpose of determining the real-time drive voltage of the air pump and the real-time drive voltage of the air valve based on the real-time deviation value is not only to ensure that the airbag meets the linear pressure increase condition and reduces the power consumption of the air valve, but also to ensure that the air pump works in the best working state, thereby improving inflation efficiency.

[0111] The following section will explain in detail how to use the PID control algorithm to calculate the real-time drive voltage of the air pump and the real-time drive voltage of the air valve; these details will not be elaborated upon here.

[0112] In other embodiments, in step S803, only the real-time drive voltage of the air valve can be adjusted according to the real-time deviation value, so that the air valve can achieve linear pressure increase.

[0113] S804: Drive the air pump according to the real-time drive voltage of the air pump, and drive the air valve according to the real-time drive voltage of the air valve.

[0114] In this step, the processor transmits the real-time drive voltage of the air pump to drive circuit 1. Then, drive circuit 1 adjusts the drive voltage of the air pump to the corresponding real-time drive voltage through a variable power control chip, thus driving the air pump. Similarly, the processor transmits the real-time drive voltage of the air valve to drive circuit 2. Then, drive circuit 2 adjusts the drive voltage of the air valve to the corresponding real-time drive voltage through a variable power control chip, thus driving the air valve.

[0115] Compared to the second embodiment of the blood pressure measurement method described above, where the valve is closed during the pressurization phase to prevent system leakage, the third embodiment of the blood pressure measurement method opens the valve during the pressurization phase to release air. Obviously, the real-time driving voltage of the valve is further reduced in the third embodiment, thereby further reducing the power consumption of the valve.

[0116] Understandably, the first venting condition mentioned in this application, in the third embodiment, can be understood as the situation where the venting amount of the air valve is greater than the second venting amount, where the second venting amount can be 0 or a value infinitely close to 0. The actual venting amount of the air valve needs to ensure that the airbag meets the linear pressure increase condition.

[0117] The following is combined Figure 9 A comprehensive explanation of the blood pressure measurement and control process in steps S801 to S804 is provided. For example... Figure 9As shown, when blood pressure measurement begins, the control valve is powered on at the set maximum voltage to ensure system airtightness. Then, the control air pump inflates the airbag at a low voltage with a 50% duty cycle. After inflation begins, the MCU detects the airbag pressure through a differential pressure sensor and calculates the inflation rate. To control a constant inflation rate and ensure the air pump operates at optimal efficiency, the MCU adjusts the drive voltage of the valve and air pump using a PID algorithm. Then, the processor determines whether inflation is complete. If not, it returns to the previous step and continues to adjust the drive voltage of the valve and air pump. If inflation is complete, the MCU can deflate the airbag through the valve or simultaneously through both the valve and air pump. It should be noted that the 50% duty cycle mentioned above is only an example of the air pump's operating parameters under optimal operating conditions, and this application does not limit it.

[0118] The following section provides a detailed explanation of how the processor uses the PID control algorithm to calculate the fourth and fifth drive voltages.

[0119] First, let's briefly describe the basic idea of ​​the PID control algorithm: Based on the magnitude of the deviation, a control quantity is calculated using proportional, integral, and derivative calculations. This control quantity is then input into the controlled system. Upon receiving this input, the system outputs a corresponding output quantity. The PID controller then detects this output quantity, recalculates the deviation, and repeats the above process. The processor in this application can be the aforementioned PID controller.

[0120] For ease of understanding, combined with Figure 10 Explain the specific process by which the processor adjusts the drive voltage of the air valve and air pump using a PID algorithm. For example... Figure 10 As shown, the processor detects the real-time air pressure value inside the airbag and calculates the real-time deviation value by comparing it with the ideal air pressure value. Then, based on this real-time deviation value, the processor calculates the control quantity using proportional, integral, and derivative methods. Here, the control quantity includes a fourth driving voltage and a fifth driving voltage. The controlled system includes drive circuit 1, an air pump, drive circuit 2, an air valve, and the airbag. The processor inputs the fourth driving voltage into drive circuit 1, causing drive circuit 1 to drive the air pump according to the fourth driving voltage. Simultaneously, the processor inputs the fifth driving voltage into drive circuit 2, causing drive circuit 2 to drive the air valve according to the fifth driving voltage. Thus, while the air pump inflates the airbag, the air valve also deflates the airbag. By continuously acquiring the real-time air pressure value inside the airbag, the processor continuously adjusts the driving voltage of the air valve and the air pump to ensure that the airbag inflates at a constant rate. In this way, the airbag achieves linear inflation throughout the inflation process, and the air pump continues to operate in optimal condition, thereby reducing the overall power consumption of the blood pressure measurement system.

[0121] In one implementation, the method by which the MCU adjusts the drive voltage of the air valve and air pump using a PID algorithm can be referred to... Figure 11 As shown. In the initial inflation stage, the MCU controls the air pump to keep the driving voltage constant, reduces the driving voltage of the air valve, and increases the air valve's leakage volume to achieve linear pressure increase of the airbag; after the airbag reaches a certain pressure, the MCU controls the air valve to first increase and then keep it constant, increases the driving voltage of the air pump, and continues to linearly increase the pressure until the airbag reaches the target pressure value. Figure 12 The diagram shows the trends of the fourth and fifth driving voltages as a function of the airbag pressure after adjustment as described above. The solid line represents the trend of the fourth driving voltage, and the dashed line represents the trend of the fifth driving voltage. Figure 12 As shown, at the start of inflation, when the airbag pressure is 0, the fourth driving voltage is at a lower position (V4), and the fifth driving voltage is at a higher position (V5). As the airbag pressure gradually increases from 0 to P1, the fifth driving voltage gradually decreases from V5 to V6 to increase the air valve's deflation capacity, while the fourth driving voltage remains constant (V4). From P1, to ensure airbag tightness, the air valve's driving voltage gradually increases, meaning the fifth driving voltage gradually rises from V6 back to V5 and then remains constant. When the airbag pressure reaches P2, the air pump's driving voltage begins to increase, meaning the fourth driving voltage gradually rises from V4 to V7, at which point the airbag reaches the target pressure value P3. It should be noted that... Figure 12 The driving voltage change curve shown is merely an example, and this application does not limit the driving voltage change curve. For example, during the process of the fourth driving voltage rising from V4 to V7, it can be a linear increase or a non-linear increase; during the process of the fifth driving voltage decreasing from V5 to V6, it can be a linear decrease or a non-linear decrease.

[0122] It should be noted that the first driving circuit mentioned in this application can be the driving circuit 1 mentioned above, and the second driving circuit can be the driving circuit 2 mentioned above.

[0123] Furthermore, the blood pressure measurement system provided in this application includes an airbag, an air valve, and a blood pressure measuring device; the blood pressure measuring device is configured to perform any of the blood pressure measurement methods in this application.

[0124] It is understood that, as used herein, the term "module" may refer to or include, or be part of, an application-specific integrated circuit (ASIC), electronic circuitry, a processor (shared, dedicated, or grouped) and / or memory that executes one or more software or firmware programs, combinational logic circuitry, and / or other suitable hardware components that provide the described functionality.

[0125] It is understood that in various embodiments of this application, the processor may be a microprocessor (micro controller unit, MCU), a digital signal processor, a microcontroller, etc., and / or any combination thereof. According to another aspect, the processor may be a single-core processor, a multi-core processor, etc., and / or any combination thereof.

[0126] It should be noted that in the examples and description of this patent, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0127] Although this application has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made thereto without departing from the scope of this application.

Claims

1. A method for measuring blood pressure, characterized in that, Applied to an electronic device, the electronic device including an airbag and an air valve for measuring blood pressure, the method includes: The electronic device enters the pressurization phase of blood pressure measurement and obtains the real-time air pressure value inside the airbag; Based on the real-time air pressure value and the first venting condition, determine the real-time driving voltage of the air valve; The air valve is driven to operate according to the real-time driving voltage; The step of determining the real-time drive voltage of the air valve based on the real-time air pressure value and the first venting condition includes: When the first venting condition is that the venting volume of the air valve is less than or equal to the first venting volume, the correspondence between the air valve voltage and the airbag pressure is obtained. Based on the correspondence between the valve voltage and the airbag pressure, determine the valve voltage corresponding to the real-time air pressure value; The valve voltage corresponding to the real-time air pressure value is determined as the real-time driving voltage of the air valve.

2. The method according to claim 1, characterized in that, In the relationship between the valve voltage and the airbag pressure, the valve voltage first decreases and then increases as the airbag pressure increases.

3. The method according to claim 1, characterized in that, The step of determining the real-time drive voltage of the air valve based on the real-time air pressure value and the first venting condition includes: When the first venting condition is that the venting volume of the air valve is greater than the second venting volume, the real-time ideal air pressure value of the airbag is obtained; the real-time ideal air pressure value represents the air pressure value corresponding to when the airbag meets the linear pressurization condition; The real-time drive voltage of the air valve is determined based on the real-time ideal air pressure value and the real-time air pressure value.

4. The method according to claim 3, characterized in that, The electronic device also includes an air pump for measuring blood pressure; The step of determining the real-time drive voltage of the air valve based on the real-time ideal air pressure value and the real-time air pressure value includes: Using a proportional-integral-derivative (PID) control algorithm, the real-time drive voltage of the air pump and the real-time drive voltage of the air valve are determined based on the real-time deviation value.

5. The method according to claim 4, characterized in that, The electronic device further includes a first drive circuit for driving the air pump to operate; the method further includes: The variable power control chip in the first drive circuit controls the drive voltage of the air pump to be the real-time drive voltage of the air pump.

6. The method according to claim 3, characterized in that, The process of obtaining the real-time ideal air pressure value of the airbag includes: Obtain a linear pressure rise curve; the linear pressure rise curve includes the ideal air pressure value corresponding to different times; Based on the linear pressure rise curve, the ideal air pressure value corresponding to the current moment is determined, and the real-time ideal air pressure value is obtained.

7. The method according to claim 1, characterized in that, The electronic device also includes a sensor connected to the airway of the airbag; The step of obtaining the real-time air pressure value inside the airbag includes: The real-time air pressure value is obtained by detecting the air pressure inside the airbag using the sensor.

8. The method according to any one of claims 1-7, characterized in that, The electronic device also includes a second drive circuit for driving the air valve to operate; The step of driving the air valve to operate according to the real-time driving voltage includes: The variable power control chip in the second drive circuit controls the driving voltage of the air valve to the real-time driving voltage, so that the air leakage of the air valve meets the first leakage condition.

9. A blood pressure measurement system, characterized in that, Includes an airbag, air valve, and blood pressure measuring device; The blood pressure measuring device is configured to perform a pressurization phase during blood pressure measurement, acquire the real-time air pressure value inside the air bladder, determine the real-time driving voltage of the air valve based on the real-time air pressure value and a first deflation condition, and drive the air valve to operate based on the real-time driving voltage. The blood pressure measuring device is further configured to, when the first deflation condition is that the deflation amount of the air valve is less than or equal to the first deflation amount, acquire the correspondence between the air valve voltage and the airbag pressure; determine the air valve voltage corresponding to the real-time air pressure value based on the correspondence between the air valve voltage and the airbag pressure; and determine the air valve voltage corresponding to the real-time air pressure value as the real-time driving voltage of the air valve.

10. A readable medium, characterized in that, The readable medium stores instructions that, when executed on an electronic device, cause the electronic device to perform the blood pressure measurement method according to any one of claims 1 to 8.

11. An electronic device, characterized in that, The electronic device includes: Memory, used to store instructions executed by one or more processors of an electronic device, and The processor is one of the processors in an electronic device, used to execute the blood pressure measurement method according to any one of claims 1 to 8.

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