Self-calibration method for blood pressure measuring device through pulse wave analysis method

Abstract

A self-calibration method of a pulse wave analysis blood pressure measuring device mainly comprises the following steps that the pressure of an air bag is regulated and controlled, and blood pressure measurement is completed through oscillography; the pressure of the air bag is adjusted to the pressure needed by blood pressure measurement through the pulse wave analysis method, the pressure is kept, and data used for blood pressure measurement through the pulse wave analysis method are collected; and binding the acquired pulse wave data with a blood pressure value calculated by an oscillography to finish calibration. According to the method, calibration can be automatically completed without additional equipment, and the use convenience of the pulse wave analysis blood pressure measuring device can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of blood pressure measurement, and in particular to a self-calibration method for a blood pressure measurement device using a pulse wave analysis method. Background Art

[0002] At present, the common non-invasive methods for measuring blood pressure are as follows:

[0003] (1) Koch sound auscultation method;

[0004] (2) Oscillometric method: This is the most popular non-invasive, automatic method for measuring blood pressure. This method extracts the amplitude change envelope of the pressure oscillation wave of the air bag during decompression or pressurization, and obtains the blood pressure value based on the relationship between the envelope and the arterial blood pressure (the most common method is the amplitude coefficient method).

[0005] Since both the Koch sound auscultation method and the oscillometric method need to apply very high pressure to block the blood vessels during measurement, it is impossible to measure blood pressure continuously without feeling. In this case, various pulse wave analysis methods based on lower pressure are receiving increasing attention, research and application:

[0006] (3) Pulse wave analysis method: It does not require blocking of blood vessels. Instead, it uses sensors to collect proximal or distal vascular pulse signals such as photoelectric pulse waves, electrocardiogram (ECG) signals, or radial pulse waves, and calculates blood pressure by analyzing arterial blood flow volume, pulse wave propagation time (or arrival time), or the position of characteristic points on the pulse wave, etc. The types of sensors used to measure blood pressure by pulse wave analysis include: single PPG (photoelectric) sensor, dual PPG sensor, single pressure sensor, pressure sensor array, ultrasonic sensor, radar wave sensor, combination of PPG and pressure sensor, etc.

[0007] However, there are the following problems with measuring blood pressure using pulse wave analysis:

[0008] (1) Inconvenient calibration

[0009] Since the pulse wave analysis method is an indirect measurement of blood pressure, the collected photoelectric signals or pressure signals need to use an algorithm to bind the waveform information to the actual blood pressure value in a certain way. This process is called calibration. After calibration, the photoelectric and pressure signals can be collected later, and the blood pressure value can be calculated based on these signals using a specific algorithm. Since the human body state is constantly changing, calibration needs to be performed frequently, generally once every 2 to 4 weeks, to maintain good algorithm accuracy. During calibration, additional equipment (such as an inflatable cuff-type upper arm sphygmomanometer, etc.) is usually required to measure blood pressure, making the calibration process very troublesome, time-consuming and labor-intensive.

[0010] (2) Waveform signal is unstable

[0011] Regardless of whether photoelectric or pressure signals are collected, the waveform shape will vary greatly due to differences in wear tightness, position, etc., which will greatly complicate subsequent algorithms.

[0012] The traditional pulse wave method of measuring blood pressure, which directly uses a sensor to sense the pulse wave, is prone to the problem that the sensor is worn too loosely and does not fit tightly to the skin, leaving an air gap between the skin and the sensor, causing the signal to deteriorate, and introducing interference from external ambient light; if it fits too tightly to the skin, local capillaries will be squeezed and ischemic, and the signal will also deteriorate. The pulse wave method blood pressure measurement device that introduces an air bag can better improve this problem.

[0013] As attached Figure 6 As shown, an example of a wristband blood pressure measuring device with a pulse wave sensor is shown, which includes: an airbag 3, an air pump assembly 1, and a flexible sensor unit 2; the airbag 3 is arranged on the lower surface of the wristband 5, the flexible sensor unit 2 is arranged on the lower surface of the airbag 3, and the air pump assembly 1 is placed in the watch housing; the flexible sensor unit 2 uses a direct bonding method to achieve the measurement of the pulse wave. When the watch is worn on the wrist 4 of the measured object, the flexible sensor unit 2 contacts the skin of the wrist 4, that is, the airbag 3 is located between the flexible sensor unit and the wristband 4, and the flexible sensor unit is located at the radial artery of the wrist; when not measuring, the wristband 5 remains in a relaxed state, that is, the airbag 3 is not inflated; when measurement is required, the pressure of the airbag 3 is adjusted by the air pump assembly 1, and the flexible sensor unit 2 is attached to the skin. The flexible sensor unit 2 can use a sensor array with multiple groups of sensors, and at least one group of sensors is located above the radial / ulnar artery after wearing.

[0014] However, how to set the pressure of the airbag becomes a key issue. For different users, the different tightness and position of the blood pressure monitor, as well as the different pressures of the airbag, will lead to inconsistent signal quality and different user experiences. Wearing it too tightly or with too much airbag pressure will make people uncomfortable and unable to wear it for a long time, and will affect the signal quality of the photoelectric sensor; wearing it too loosely or with too little airbag pressure will make the signal quality of the pressure pulse wave poor. Summary of the invention

[0015] The present disclosure provides a self-calibration method for a pulse wave analysis method blood pressure measurement device, which can realize self-calibration and greatly simplify the calibration process, and is particularly suitable for a surrounding fixed pulse wave analysis method blood pressure meter with an air bag.

[0016] The present disclosure provides a self-calibration method for a blood pressure measurement device using a pulse wave analysis method, based on a blood pressure measurement device comprising: a wraparound fixing device; a sensor for oscillometric blood pressure measurement and pulse wave blood pressure measurement, which at least comprises a pressure sensor; and an airbag and an internal pressure adjustment component of the airbag for helping the sensor sense a blood pressure signal;

[0017] The self-calibration method comprises the following steps:

[0018] S1, oscillometric blood pressure measurement: adjusting the pressure in the airbag, and performing oscillometric blood pressure measurement based on the pressure sensor;

[0019] S2, pulse wave analysis method data acquisition: obtaining the airbag pressure value required for the pulse wave analysis method blood pressure measurement, and making the airbag maintain the pressure, and collecting the data required for the pulse wave analysis method to calculate the blood pressure;

[0020] S3, calibration: Bind the data obtained in step S2 with the blood pressure value obtained in step S1 to complete the calibration.

[0021] The calibration process can be automatically started and completed according to a set time period (such as one week or one month), or when the measured blood pressure data is significantly different from the usual historical data, which greatly simplifies the use of the blood pressure measurement device.

[0022] Furthermore, the step S1 specifically includes:

[0023] The airbag is gradually inflated to a state where the arterial blood flow is blocked, or gradually deflated from a state where the arterial blood flow is blocked;

[0024] Extracting the envelope of the pulse wave oscillation signal collected by the pressure sensor;

[0025] Based on the relationship between the signal envelope and arterial blood pressure, the systolic and diastolic blood pressures are determined.

[0026] Furthermore, in step S2, the data required for blood pressure measurement using the pulse wave analysis method includes: a combination of one or more of photoelectric volumetric pulse wave, electrocardiogram signal, and pressure pulse wave.

[0027] Furthermore, in step S2, the method for obtaining the air bag pressure value required for blood pressure measurement using the pulse wave analysis method includes:

[0028] S21, the airbag is continuously pressurized or depressurized by inflating and deflating air;

[0029] S22, during the process of pressurization or depressurization, continuously collecting the signal of the pulse wave detection sensor;

[0030] S23, processing the sensor signal obtained in step S22, extracting the pulse wave signal, and selecting the airbag pressure corresponding to the pulse wave signal that meets the quality requirements as the airbag pressure set during subsequent pulse wave data collection.

[0031] Furthermore, in step S23, the quality requirements include: the signal amplitude is greater than a certain threshold, and / or the signal burrs are less than a certain number.

[0032] Furthermore, in step S23, the step of selecting the airbag pressure corresponding to the pulse wave signal that meets the quality requirements specifically includes:

[0033] Select the minimum airbag pressure that meets the signal quality requirements;

[0034] Or the air bag pressure corresponding to the last pulse cycle of several consecutive pulse wave signals that meet the signal quality requirements.

[0035] Furthermore, the execution process of steps S1-S3 is performed in any one of the following ways:

[0036] Method 1: During the inflation process, the selection of the airbag pressure required for the pulse wave analysis method blood pressure measurement and the oscillometric method blood pressure measurement are completed; during the deflation process, the pulse wave analysis method data collection and blood pressure calibration are completed;

[0037] Method 2: During the inflation process, the selection of the airbag pressure required for the pulse wave analysis method blood pressure measurement and the pulse wave analysis method data collection are performed; during the deflation process, the oscillometric method blood pressure measurement and blood pressure calibration are completed;

[0038] Method three: complete oscillometric blood pressure measurement through a complete inflation and deflation process; complete the selection of the airbag pressure required for pulse wave analysis blood pressure measurement and pulse wave analysis data collection through another inflation and deflation process; and finally complete the blood pressure calibration.

[0039] A pulse wave analysis blood pressure measuring device with a self-calibration function using the above method comprises:

[0040] Air bags and pumps;

[0041] Sensors for oscillometric and pulse wave blood pressure measurements, including at least a pressure sensor;

[0042] A surrounding fixing device, used for fixing the airbag and the sensor at the measuring point of the limb and applying pressure to the measuring point;

[0043] The blood pressure measurement control and calculation calibration module is used to control the air pump to generate corresponding air bag pressure according to the requirements of different blood pressure measurement methods in accordance with the steps S1-S3, perform oscillometric blood pressure measurement, pulse wave analysis data collection, and calibrate the pulse wave blood pressure measurement results according to the oscillometric blood pressure measurement results.

[0044] Furthermore, the pressure sensor comprises:

[0045] High-range pressure sensor for measuring pressure during oscillometric blood pressure measurement;

[0046] Low range pressure sensor for measuring pressure when measuring blood pressure using pulse wave analysis.

[0047] Furthermore, the device also includes: other sensors for blood pressure measurement using pulse wave analysis, including: one or more of a single PPG sensor, a dual PPG sensor, a pressure sensor array, an ultrasonic sensor or its array, and a radar wave sensor.

[0048] Compared with the prior art, the present invention has the following advantages: (1) calibration can be completed without the need for additional equipment; (2) calibration is completed automatically without human intervention; (3) the appropriate airbag pressure value can be automatically found during the calibration process, thereby improving adaptability to different users and postures; and (4) the practicality of the blood pressure measurement technology using pulse wave analysis is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0050] Figure 1 is a flow chart of an embodiment according to the present disclosure;

[0051] Figure 2 It is the signal collected by the pressure sensor during inflation, with the horizontal axis representing time and the vertical axis representing pressure value;

[0052] Figure 3 is an example of the extracted pulse wave signal;

[0053] Figure 4 This is an example of a pulse wave signal under stable pressure;

[0054] Figure 5 is a flow chart of the second embodiment;

[0055] Figure 6 The present invention is a schematic diagram of the overall structure of a wristband-type blood pressure measuring device with a pulse wave sensor; wherein: 1-air pump assembly; 2-flexible sensor unit; 3-air bag; 4-wrist; 5-wristband. DETAILED DESCRIPTION

[0056] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0057] The present disclosure provides a self-calibration method for a blood pressure measurement device using a pulse wave analysis method, wherein the blood pressure measurement device using a pulse wave analysis method comprises: a wrap-around fixing device; a sensor for oscillometric blood pressure measurement and pulse wave blood pressure measurement; and an air bag and an internal pressure adjustment component of the air bag for helping the sensor sense a blood pressure signal. The sensor comprises at least a pressure sensor to complete oscillometric blood pressure measurement for calibration (if the pulse wave analysis method also uses a pressure sensor, then preferably, two pressure sensors of a high range and a low range can be provided, which are used for oscillometric and pulse wave analysis blood pressure measurement, respectively).

[0058] The method mainly includes the following steps:

[0059] S1, oscillometric blood pressure measurement: the balloon is inflated to the state of arterial blood flow occlusion, and the blood pressure measurement is completed by oscillometric method;

[0060] S2, pulse wave analysis method data collection: inflate or deflate the airbag to the pressure required for pulse wave analysis method blood pressure measurement, and maintain the pressure to collect data for pulse wave analysis method blood pressure measurement;

[0061] S3, blood pressure calculation and calibration: blood pressure is calculated using the data obtained in step S2, and is bound to the blood pressure value calculated by the oscillometric method in step S1 to complete the calibration.

[0062] The self-calibration method provided in the present disclosure introduces oscillometric blood pressure measurement on the basis of pulse wave analysis method on the same device, and can complete the self-calibration of blood pressure measurement by pulse wave analysis method, avoiding additional external calibration equipment, simplifying the composition of the device, and improving the practicality and convenience of pulse wave analysis method;

[0063] The calibration process can be automatically started and completed according to a set time period (such as one week or one month), or when the measured blood pressure data is significantly different from the usual historical data, which greatly simplifies the use of the device.

[0064] The specific process is further described as follows:

[0065] 1. Oscillometric blood pressure measurement

[0066] The oscillometric method is one of the most common methods currently. It uses a cuff and a pressure sensor to detect the pressure inside the cuff. The measured value of the pressure sensor not only changes with the change of the cuff inflation pressure, but also fluctuates up and down with the change of blood pressure at certain moments, and the amplitude of the fluctuation will change according to the change of the cuff inflation pressure. After the cuff begins to inflate slowly, when the pressure fluctuation first occurs, the cuff pressure is equal to the diastolic pressure; as the inflation continues, the fluctuation amplitude gradually increases, and when it reaches the maximum value, the cuff pressure corresponds to the average pressure; thereafter, the fluctuation amplitude gradually decreases, and when the fluctuation disappears, the cuff pressure corresponds to the systolic pressure. Therefore, by extracting the envelope of the pressure oscillation signal collected by the pressure sensor, the systolic pressure and diastolic pressure can be determined based on the relationship between the signal envelope and the arterial blood pressure.

[0067] Similarly, the envelope of the pressure oscillation signal can be obtained by first inflating the air to a state where the arterial blood flow is blocked and then gradually deflating the air.

[0068] 2. Pulse wave analysis data collection

[0069] Data used for blood pressure measurement by pulse wave analysis method include: photoelectric pulse wave, ECG signal, radius pulse wave, peripheral pulse wave, etc. The air bag pressure required for blood pressure measurement by pulse wave analysis method is usually significantly lower than the maximum pressure in oscillometric method (usually 150-200 mmHg). Preferably, in an exemplary embodiment, the pressure range is set to 60-100 mmHg.

[0070] However, considering that the appropriate airbag pressure required for blood pressure measurement by pulse wave analysis method is different for different users, different wearing positions or postures, etc., therefore, as a preferred method, the present disclosure provides a method for selecting and determining the airbag pressure value:

[0071] As attached Figure 2 The figure shows an example of the signal collected by the pressure sensor during inflation, with the horizontal axis representing time and the vertical axis representing pressure value. It can be seen that as the airbag pressure value continues to increase, and after the pressure increases to a certain level, some sawtooth-like oscillation waves appear on the waveform, which are caused by the pulse.

[0072] The above signal is processed to extract the pulse wave, as shown in the attached Figure 3 As shown (relative Figure 2 , the previous part without waveform is cut off). It can be seen that when the airbag pressure is relatively low, the amplitude of the pulse wave is small and there are more burrs; when the pressure increases to a certain level, the signal quality of the pulse wave becomes good.

[0073] Therefore, the airbag can be continuously pressurized or depressurized by inflating and deflating air; during the pressurization or depressurization process, the signal of the pulse wave detection sensor is continuously collected; the acquired sensor signal is processed, including baseline removal and filtering, and the pulse wave signal is extracted; the pulse wave signal is periodically segmented, and then according to the required signal quality standard, the appropriate airbag pressure P can be selected as the airbag pressure for subsequent pulse wave data collection.

[0074] This method can be used in the process of gradually inflating the airbag, when the pulse wave gradually increases to meet the signal quality requirements for measuring blood pressure by the pulse wave analysis method; or in the process of gradually deflating the airbag from high pressure, when the pulse wave intensity gradually increases and then decreases to meet the signal quality requirements for measuring blood pressure by the pulse wave analysis method, and the pressure value required for blood pressure measurement by the pulse wave analysis method is set according to the airbag pressure at this time.

[0075] The signal quality standard may be to require the amplitude to be greater than a certain threshold, or to require the burrs to be less than a certain number, or a combination of the two;

[0076] The airbag pressure P may be selected by selecting the minimum pressure P that meets the signal quality standard, or the airbag pressure P corresponding to the last pulse cycle in which the pulse wave signal of multiple consecutive pulse cycles meets the signal quality standard.

[0077] The pressurization or depressurization of the airbag can be carried out by continuous pressure regulation or step pressure regulation. Step pressure regulation means that after each pressurization or depressurization to a pressure value, the current pressure is maintained for a period of time, and the sensor signal is collected and processed. When the continuous pressure regulation method is adopted, when the pressure meets a certain initial threshold, continuous pressure regulation can be started at a relatively fixed speed. At the same time, the acquired sensor signal is processed once at a certain interval, and only the newly added pulse wave signal sequence is processed each time. When the airbag pressure P with signal quality that meets the requirements is found, the processing process is terminated.

[0078] If the blood pressure measurement device uses more than one pulse wave detection sensor at the same time, the air bag pressurization or depressurization is correspondingly divided into multiple serial stages to find the appropriate air bag pressure for each sensor respectively, and use the respective appropriate air bag pressure in the subsequent pulse wave data collection.

[0079] 3. Specific process of self-calibration

[0080] As described above, preferably, the self-calibration process in the exemplary embodiment further includes the above-mentioned step of selecting the airbag pressure. The oscillometric blood pressure measurement, pulse wave analysis data collection and calibration, and airbag pressure selection can be performed in a variety of ways.

[0081] (1) Implementation method 1: oscillometrically measure blood pressure and balloon pressure selection during inflation, and collect data and complete calibration during deflation.

[0082] As attached Figure 1 As shown, the option of oscillometric measurement of blood pressure and balloon pressure P during inflation;

[0083] After the inflation process is completed, the systolic and diastolic pressures are calculated using the oscillometric method according to existing methods;

[0084] Then start to deflate. When the airbag pressure reaches P, keep the pressure constant and then start the data collection process of pulse wave analysis method.

[0085] After collecting data for a certain period of time, these signals are bound to the blood pressure values ​​just calculated by the oscillometric method to complete the calibration process.

[0086] (2) Implementation Method 2: When inflating, the airbag pressure is selected and data is collected. When deflated, the blood pressure is measured by oscillometric method and calibration is completed.

[0087] During the inflation process, the airbag pressure P that can obtain a reliable quality pulse wave signal is found by continuous pressurization or step-by-step pressurization. The continuous pressurization method is similar to the first embodiment and will not be described in detail. Step-by-step pressurization means that after each pressurization reaches a certain pressure value, the current pressure is maintained for a period of time, so that the pulse wave signal can be stabilized and the signal quality detection can be more accurate. A typical signal such as Figure 4 As shown, it can be seen that since the airbag pressure value is stable, the periodicity of the pressure pulse wave signal is better, which is more conducive to judging the signal quality.

[0088] During the step-by-step pressure increase, once the quality of the pulse wave signal is found to meet the requirements, the pressure can be stabilized at the current value and the data acquisition process can be started;

[0089] After the balloon pressure P search process and data collection are completed, the oscillography process is started. This process generally requires continuing to pressurize to a higher pressure value, close to blocking the blood vessel, and then collecting signals during the deflation process to calculate the blood pressure.

[0090] The flowchart of the whole process is attached. Figure 5 shown.

[0091] (3) Implementation method three: Calibration is completed during two inflation and deflation processes.

[0092] That is, the selection of the airbag pressure, data collection and oscillometric blood pressure measurement are separated into two independent processes, that is, the oscillometric measurement is completed in a separate, complete inflation and deflation process, and the selection of the airbag pressure and data collection are completed in another separate inflation and deflation process. The order of these two processes is uncertain.

[0093] A blood pressure measuring device using a pulse wave analysis method using the above method comprises:

[0094] The airbag, air pump and inflation control module are used to generate corresponding airbag pressure according to the requirements of measuring blood pressure by different methods;

[0095] A pressure sensor, used to measure changes in airbag pressure;

[0096] A wraparound fixing device, used for fixing the air bag and the pressure sensor at the measuring point of the limb and applying pressure to the measuring point;

[0097] The blood pressure analysis and calculation module is used to calculate the blood pressure based on the oscillometric method and pulse wave analysis and perform self-calibration.

[0098] Preferably, two pressure sensors may be provided, one for the oscillometric method and the other for the pulse wave analysis method:

[0099] High-range pressure sensor, used to measure pressure changes during oscillometric blood pressure measurement;

[0100] Low range pressure sensor used to measure pressure changes when measuring blood pressure using pulse wave analysis.

[0101] In addition, other sensors may also be used for pulse wave analysis, including: single PPG sensor, dual PPG sensor, pressure sensor array, ultrasonic sensor, radar wave sensor, etc.

[0102] The above technical scheme is only an exemplary embodiment of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific embodiment of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

Claims

1. A self-calibration method for a blood pressure measuring device using a pulse wave analysis method, the blood pressure measuring device comprising: A wrap-around fixture; a sensor for oscillometric blood pressure measurement and pulse wave blood pressure measurement, which includes at least a pressure sensor; and an air bag and an internal pressure adjustment component of the air bag for helping the sensor to sense a blood pressure signal; The self-calibration method comprises the following steps: S1, oscillometric blood pressure measurement: adjusting the pressure in the airbag, and performing oscillometric blood pressure measurement based on the pressure sensor; S2, pulse wave analysis method data acquisition: obtaining the airbag pressure value required for the pulse wave analysis method blood pressure measurement, and making the airbag maintain the pressure, and collecting the data required for the pulse wave analysis method to calculate the blood pressure; S3, calibration: Bind the data obtained in step S2 with the blood pressure value obtained in step S1 to complete the calibration.

2. The method according to claim 1, characterized in that The step S1 specifically includes: The airbag is gradually inflated to a state where the arterial blood flow is blocked, or gradually deflated from a state where the arterial blood flow is blocked; Extracting the envelope of the pulse wave oscillation signal collected by the pressure sensor; Based on the relationship between the signal envelope and arterial blood pressure, the systolic and diastolic blood pressures are determined.

3. The method according to claim 1, characterized in that In step S2, the data required for blood pressure measurement using the pulse wave analysis method includes: a combination of one or more of photoelectric volumetric pulse wave, electrocardiogram signal, and pressure pulse wave.

4. The method according to claim 1, characterized in that: In step S2, the method for obtaining the air bag pressure value required for blood pressure measurement using the pulse wave analysis method includes: S21, the airbag is continuously pressurized or depressurized by inflating and deflating air; S22, during the process of pressurization or depressurization, continuously collecting the signal of the pulse wave detection sensor; S23, processing the sensor signal obtained in step S22, extracting the pulse wave signal, and selecting the airbag pressure corresponding to the pulse wave signal that meets the quality requirements as the airbag pressure set during subsequent pulse wave data collection.

5. The method according to claim 4, characterized in that In step S23, the quality requirements include: the signal amplitude is greater than a certain threshold, and / or the signal burrs are less than a certain number.

6. The method according to claim 4 or 5, characterized in that: In step S23, the step of selecting the airbag pressure corresponding to the pulse wave signal that meets the quality requirements specifically includes: Select the minimum airbag pressure that meets the signal quality requirements; Or the air bag pressure corresponding to the last pulse cycle of several consecutive pulse wave signals that meet the signal quality requirements.

7. The method according to claim 4, characterized in that The execution process of steps S1-S3 is performed in any one of the following ways: Method 1: During the inflation process, the selection of the airbag pressure required for the pulse wave analysis method blood pressure measurement and the oscillometric method blood pressure measurement are completed; during the deflation process, the pulse wave analysis method data collection and blood pressure calibration are completed; Method 2: During the inflation process, the selection of the airbag pressure required for the pulse wave analysis method blood pressure measurement and the pulse wave analysis method data collection are performed; during the deflation process, the oscillometric method blood pressure measurement and blood pressure calibration are completed; Method three: complete oscillometric blood pressure measurement through a complete inflation and deflation process; complete the selection of the airbag pressure required for pulse wave analysis blood pressure measurement and pulse wave analysis data collection through another inflation and deflation process; and finally complete the blood pressure calibration.

8. A blood pressure measuring device using a pulse wave analysis method according to any one of claims 1 to 7, characterized in that: include: Air bags and pumps; Sensors for oscillometric and pulse wave blood pressure measurements, including at least a pressure sensor; A surrounding fixing device, used for fixing the airbag and the sensor at the measuring point of the limb and applying pressure to the measuring point; The blood pressure measurement control and calculation calibration module is used to control the air pump to generate corresponding air bag pressure according to the requirements of different blood pressure measurement methods in accordance with the steps S1-S3, perform oscillometric blood pressure measurement, pulse wave analysis data collection, and calibrate the pulse wave blood pressure measurement results according to the oscillometric blood pressure measurement results.

9. The device according to claim 8, characterized in that The pressure sensor comprises: High-range pressure sensor for measuring pressure during oscillometric blood pressure measurement; Low range pressure sensor for measuring pressure when measuring blood pressure using pulse wave analysis.

10. The device according to claim 8, characterized in that Also includes: Other sensors used for blood pressure measurement using pulse wave analysis include: one or more of a single PPG sensor, a dual PPG sensor, a pressure sensor array, an ultrasonic sensor or its array, and a radar wave sensor.

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