CN113520357B - Blood pressure measuring device and method - Google Patents

Abstract

An embodiment of the present application provides a method and device for measuring blood pressure, wherein the method includes obtaining the pressure range required to be applied by the first airbag; Partial pressure is applied to the part; in the process of local pressure application, the first sensor in the flexible array sensor that collects the pulse oscillatory wave signal is obtained, and the second sensor that collects the pulse oscillatory wave signal with the largest amplitude is obtained; when When the first sensor and the second sensor are not the same sensor, the pulse oscillation wave signals collected by the first sensor and the second sensor are fused, and the blood pressure value of the user is calculated according to the fused pulse oscillation wave signal and pressure wave signal. The blood pressure measurement method and device provided in the embodiments of the present application can improve comfort during continuous blood pressure measurement.

Description

Device and method for measuring blood pressure

technical field

The present application relates to the technical field of electronic equipment, in particular to a blood pressure measuring device and method.

Background technique

Human blood pressure refers to the pressure produced by the pulsating blood flow in the blood vessel on the blood vessel wall laterally and perpendicular to the blood vessel wall. for low pressure. Blood pressure is an important indicator of health monitoring, which can reflect the health status of the human body. Therefore, how to measure blood pressure conveniently has become a hot issue.

At present, the wrist blood pressure meter is commonly used to measure blood pressure. The wrist blood pressure meter includes an air bag, an air pump and a pressure sensor. It is based on the principle of the oscillometric method: the air pump inflates the air bag, causing the air bag to pressurize and expand, compressing the radial artery in the wrist. The pressure sensor integrated in the instrument is connected with the airbag. During the process of inflating and boosting pressure, the radial artery is compressed. The pressure sensor will extract the pulse oscillation wave signal, and calculate the blood pressure based on the characteristics of the extracted pulse wave oscillation signal. However, the structure of the wrist blood pressure monitor is complicated, the equipment is large, not easy to carry, and the measurement comfort experience is poor, so it is difficult to meet the needs of continuous measurement for a long time.

Another watch-type sphygmomanometer manually determines the position of the radial artery and uses a mechanical pump for pressurization. Blood pressure measurement is generally based on the principle of tension method: external pressure is applied to the arterial part of the body to change the stress (tension) of the inner circumference of the blood vessel; when the external force reaches a certain value, the blood vessel is in a flat state, and the pressure inside the blood vessel is equal to the external force. The pressure measured by the pressure sensor is proportional to the arterial blood pressure; therefore, the arterial pressure wave can be obtained through the output of the pressure sensor, and then the blood pressure value can be estimated according to the pressure wave. However, it is difficult to ensure that the pressure sensor is precisely positioned directly above the crushed part of the measured artery during the measurement process, and in the continuous measurement process, a wide range of long-term wrist compression is likely to cause discomfort to the user.

Contents of the invention

Embodiments of the present invention provide a blood pressure measurement device and method, which can be applied to continuous measurement and improve the comfort of blood pressure measurement.

In view of this, the first aspect of the embodiment of the present application provides a blood pressure measurement device. The blood pressure measurement device includes a device body, a wristband, a first airbag connected to the wristband, and a flexible array sensor; the device body includes a processor, a pressure sensor and micropump;

The flexible array sensor and the pressure sensor are respectively connected to the processor; the wristband is used to surround and fix the device body on the body part of the user to be monitored;

The flexible array sensor is in contact with the skin surface of the user's arterial vessel region, the flexible array sensor includes at least one sensor;

The length of the first airbag is less than the circumference of the wristband, and the first airbag is used for localized pressure on the body part;

The micropump is used to inflate the first airbag or deflate the first airbag;

The pressure sensor is used to collect the pressure wave signal in the first airbag during the inflation or deflation process of the micropump;

The processor is configured to obtain the pressure range required to be applied by the first airbag; control the micropump to inflate the first airbag, so that the pressure in the first airbag is adjusted to the pressure range, so as to locally apply pressure to the body part;

During the local pressure application process, the processor acquires the first sensor that first collects the pulse oscillatory wave signal among the flexible array sensors;

The processor acquires the second sensor that collects the pulse oscillatory wave signal with the maximum amplitude;

When the first sensor and the second sensor are not the same sensor, fusing the pulse oscillatory wave signals collected by the first sensor and the second sensor;

Calculate the user's blood pressure value according to the fused pulse oscillation wave signal and pressure wave signal.

In the above solution, local pressure is applied to the body parts according to the obtained pressure range, so that when the user's arterial blood vessel is compressed to a flat state, the amplitude of the pulse oscillation wave signal measured outside the arterial blood vessel is linearly related to the arterial blood pressure, thereby The user's blood pressure is continuously measured using the tonometry method. Therefore, the comfort and accuracy of continuous blood pressure measurement can be improved.

In one embodiment, the blood pressure measurement device further includes a second airbag connected to the wristband, the second airbag is stacked with the first airbag and is independently arranged, and the second airbag is used to apply pressure around the body part;

The processor is also used to control the micropump to inflate the second airbag, and the first airbag is not inflated;

During the surrounding pressure application process, the processor is also used to obtain the pressure wave signal in the second air bag collected by the pressure sensor;

Separate the pulse oscillatory wave signal from the pressure wave signal, and perform peak fitting on the pulse oscillatory wave signal to obtain the oscillatory wave envelope;

Obtain the user's blood pressure value by analyzing the functional relationship between the oscillatory wave envelope and blood pressure;

The local pressure range required by the first air bag is determined according to the blood pressure value.

In one embodiment, the first airbag is embedded in the wristband, and the flexible array sensor is arranged on the surface of the wristband; or the first airbag is arranged on the surface of the wristband, and the flexible array sensor is arranged on the first airbag away from the wristband s surface.

In one embodiment, the processor is further configured to acquire the input blood pressure value of the user to be monitored; and calculate the locally applied pressure range required by the first airbag according to a preset blood pressure conversion relationship.

In one embodiment, the processor is further configured to acquire the identification codes of the first sensor and the second sensor; when the identification codes of the first sensor and the second sensor are consistent, confirm that the first sensor and the second sensor are the same sensor .

By obtaining the identification code, it is possible to quickly identify whether the first sensor and the second sensor are the same sensor, which is efficient and fast.

In one embodiment, the processor is further configured to fuse the pulse oscillatory wave signals collected by the first sensor and the second sensor according to a preset weight ratio.

For example, the pulse oscillating wave signal collected by the first sensor is the first signal (S1), the pulse oscillating wave signal collected by the second sensor is the second signal (S2), and the weight of the first signal is m1, and the weight of the second signal is m1. The weight of the road signal is m2, then the fused pulse oscillatory wave signal Scombine=m1S1+m2S2

In one embodiment, the processor is further configured to fuse the pulse oscillatory wave signals collected by the first sensor and the second sensor according to the summing and averaging method.

For example, the pulse oscillating wave signal collected by the first sensor is the first signal (S1), the pulse oscillating wave signal collected by the second sensor is the second signal (S2), and the fused pulse oscillating wave signal Scombine=(S1+ S2)/2.

In one embodiment, the processor is also used to obtain the pressure wave signal collected by the pressure sensor during the local pressure application process, separate the pressure wave signal from the pressure wave signal to obtain the linear pressure baseline signal, and obtain the pulse oscillation wave signal and Blood pressure values were calculated from the linear pressurized baseline signal.

In one embodiment, the processor is further configured to calculate the blood pressure value of the user according to the pulse oscillation wave signal and the pressure wave signal collected by the first sensor when the first sensor and the second sensor are the same sensor.

In one embodiment, the flexible array sensor is a rectangular array sensor, and the flexible array sensor includes a photocapacitive volumetric description sensor.

In view of this, the second aspect of the embodiment of the present application provides a method for measuring blood pressure, the method comprising:

Obtaining the pressure range required to be applied by the first airbag, wherein the first airbag is connected to the pressure sensor;

Inflate and pressurize the first airbag, so that the pressure in the first airbag is adjusted to a pressure range, so as to locally exert pressure on the user's body parts;

In the process of local pressure application, obtain the first sensor that first collects the pulse oscillatory wave signal among the flexible array sensors, and obtain the second sensor that collects the pulse oscillatory wave signal with the largest amplitude; wherein, the flexible array sensor and the user's artery Skin-surface contact in the vascular area;

When the first sensor and the second sensor are not the same sensor, fusing the pulse oscillatory wave signals collected by the first sensor and the second sensor;

Calculate the user's blood pressure value according to the fused pulse oscillation wave signal and the pressure wave signal collected by the pressure sensor.

In one embodiment, obtaining the pressure range required to be applied by the first air bag of the blood pressure measuring device includes:

inflating a second airbag to apply surrounding pressure to the user's body part, wherein the second airbag is connected to the pressure sensor;

During the surrounding pressure application process, the pressure wave signal in the second air bag collected by the pressure sensor is obtained;

Separate the pulse oscillatory wave signal from the pressure wave signal, and perform peak fitting on the pulse oscillatory wave signal to obtain the oscillatory wave envelope;

Obtain the user's blood pressure value by analyzing the functional relationship between the oscillatory wave envelope and blood pressure;

The pressure range required to be applied by the first air bag is determined according to the blood pressure value.

In one embodiment, obtaining the pressure range required to be applied by the first air bag of the blood pressure measuring device includes:

Obtain the input blood pressure value of the user to be monitored; calculate the local pressure range required by the first airbag according to the preset blood pressure conversion relationship.

In one embodiment, when the first sensor and the second sensor are not the same sensor, before fusing the pulse oscillatory wave signals collected by the first sensor and the second sensor, the method further includes:

Obtain the identification codes of the first sensor and the second sensor;

When the identification codes of the first sensor and the second sensor are consistent, it is confirmed that the first sensor and the second sensor are the same sensor.

In one embodiment, when the first sensor and the second sensor are not the same sensor, fusing the pulse oscillatory wave signals collected by the first sensor and the second sensor includes:

The pulse oscillatory wave signals collected by the first sensor and the second sensor are fused according to a preset weight ratio.

In one embodiment, when the first sensor and the second sensor are not the same sensor, fusing the pulse oscillatory wave signals collected by the first sensor and the second sensor includes:

The pulse oscillatory wave signals collected by the first sensor and the second sensor are fused according to the summing and averaging method.

In one embodiment, the processor calculates the user's blood pressure value according to the fused pulse oscillation wave signal and the pressure wave signal collected by the pressure sensor, including:

Obtain the pressure wave signal collected by the pressure sensor during the local pressurization process, and separate the pressure wave signal from the pressure wave signal to obtain a linear pressurization baseline signal;

The blood pressure value was calculated according to the fused pulse oscillatory wave signal and the linear pressurized baseline signal.

In one embodiment, when the first sensor and the second sensor are the same sensor, the blood pressure value of the user is calculated according to the pulse oscillation wave signal and the pressure wave signal collected by the first sensor.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic structural view of a wrist-worn sphygmomanometer in the prior art;

FIG. 2 is a schematic structural view of a watch-type sphygmomanometer in the prior art;

Fig. 3 is a schematic diagram of an application scenario of a blood pressure measurement device provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a blood pressure measuring device provided by an embodiment of the present invention;

Fig. 5a is a schematic structural diagram of a wristband of a blood pressure measuring device provided in an embodiment of the present application;

Fig. 5b is a schematic cross-sectional structure diagram of a wristband of the blood pressure measuring device provided in the embodiment of the present application;

Fig. 5c is a schematic cross-sectional structure diagram of another wristband of the blood pressure measuring device provided in the embodiment of the present application;

Fig. 5d is a schematic cross-sectional structure diagram of another wristband of the blood pressure measuring device provided in the embodiment of the present application;

6 is a schematic diagram of a pressure wave signal, an oscillatory wave signal, and an oscillatory wave envelope provided by an embodiment of the present invention;

FIG. 7 is a schematic flowchart of a blood pressure measurement method provided by an embodiment of the present invention;

Fig. 8a is a schematic diagram of the position of the array sensor and the artery provided by the embodiment of the present invention;

Fig. 8b is a schematic diagram of another position of the array sensor and the artery provided by the embodiment of the present invention.

Detailed ways

In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In this application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple .

For ease of understanding, some descriptions of concepts related to the embodiments of the present application are given by way of example for reference. As follows:

The blood pressure measurement device in the embodiment of the present application can be applied in the field of wearable medical equipment, daily monitoring, etc., as shown in FIG. 1 , an existing wristband blood pressure monitor 100 uses the oscillometric method to measure blood pressure. Specifically, first tie the wristband 102 on the wrist, inflate the wristband, and stop the pressurization after a certain pressure is reached. When the blood flows in the blood vessel, there will be a certain oscillation wave, and the oscillation wave propagates to the pressure sensor through the trachea. The pressure sensor can detect the pressure and fluctuations in the measured wristband in real time. The processor will separate the pressure signal detected by the pressure sensor into two parts: the linear pressure baseline signal and the pulse oscillation wave signal. The linear pressure baseline signal is The part of the signal that is linearly changing with time is separated from the pressure signal, and then the blood pressure value is calculated by the measured pulse oscillation wave signal and the linear pressurized baseline signal. When the amplitude of the pulse oscillation wave is the largest, it corresponds to the average Blood pressure (mean blood pressure, MBP), systolic blood pressure (systolic blood pressure, SBP) corresponds to the first inflection point of the envelope of the pulse oscillatory wave signal, and diastolic blood pressure (DBP) corresponds to the first inflection point of the pulse oscillatory wave signal envelope The second inflection point.

When the user uses the wrist-worn sphygmomanometer to perform continuous cycle measurement, multiple times of inflation and compression of the blood vessel will make the user wearing the measurement device feel obvious discomfort, especially when the continuous measurement at night rests, it will affect the user's sleep .

As shown in Figure 2, the existing watch-type sphygmomanometer uses the tonometry method to measure blood pressure. The principle of the tonometry method is to use a balloon or other device to compress the blood vessel to a flat state. A shock is generated, which causes the sensor to deform and generate a pressure pulse oscillation wave signal. When the blood vessel is compressed to a flat state, the blood vessel is approximately a rigid device, and the amplitude of the pulse oscillatory wave signal measured outside the arterial vessel is in a linear relationship with the arterial blood pressure. The measured pressure pulse peak and trough amplitude values need to be calibrated, that is, at the same time as the pressure pulse wave is measured or within a short period of time, use other standard methods for measuring blood pressure to measure the real arterial systolic pressure and diastolic pressure, and the pressure pulse wave The peak and trough amplitude values are linearly mapped to true arterial systolic and diastolic pressures, respectively. When blood pressure is measured again, it is only necessary to measure the pressure pulse oscillation wave signal by tonometry, and then the systolic blood pressure and the diastolic blood pressure can be calculated according to the calibration relationship determined in advance. Because tonometry can capture beat-to-beat pressure pulse waves, tonometry can be used to measure blood pressure continuously. However, under this method, it is necessary to ensure that the pressure sensor is accurately positioned directly above the compressed part of the measured artery during the acquisition process, and continuous pressurization is required to determine how much pressure can make the arterial vessel compressed to a flat state. When the pressure Relative movement occurs between the sensor and the arterial blood vessel, and the reliability of the measured blood pressure is low.

The embodiment of the present invention provides a blood pressure measurement method and device to solve the problem that when the blood pressure measurement device uses the waveform analysis method to continuously measure blood pressure, multiple times of inflating and pressurizing blood vessels will affect the normal life of the user and cause poor comfort; while using the tension measurement method When continuously measuring blood pressure, it is difficult to quickly know the pressure required for continuous pressurization, which makes the continuous inflation during the continuous monitoring process uncomfortable for users. The method and device provided in this application can ensure the accuracy of measurement without affecting normal work and life. The blood pressure measurement device also has potential application scenarios in the medical market, and can be used as a continuous blood pressure measurement to improve user comfort.

For the convenience of description, the blood pressure measuring device will be described in detail below. Fig. 3 is a schematic diagram of an application scenario of a blood pressure measurement device provided by an embodiment of the present invention. As shown in FIG. 3 , the blood pressure measurement device 100 is arranged around the user's to-be-tested site, and there is no limitation on the user's to-be-tested site (eg, wrist, ankle).

FIG. 4 is a schematic structural diagram of a blood pressure measurement device provided by an embodiment of the present invention. As shown in FIG. 4 , the blood pressure measurement device 100 includes a device body 11 , a wristband 12 and a flexible array sensor 13 connected to the wristband 12 .

The device body 11 includes a housing 110 and a processor 111 , a pressure sensor 112 and a micropump 113 disposed in the housing 110 . The casing 110 is fixedly connected with the wristband 12, and the wristband 12 makes the device body 11 surround and fit the user's parts to be detected, such as wrists, fingers, ankles and the like. As shown in FIG. 3 , the wristband 12 is worn on the user's wrist.

The processor 111 may be an MCU (Micro Controller Unit, micro control unit) or other units capable of processing signals.

The pressure sensor 112 and the micropump 113 are connected to the processor 111 . Exemplarily, these devices can be arranged on a printed circuit board, and connected through signal traces on the printed circuit board. The micropump 113 is used to inflate or deflate; the pressure sensor 112 is used to collect pressure wave signals when the micropump 113 is inflating or deflated.

The wristband 12 is used to securely wear the device body 11 on the body part of the user, such as the wrist. The product form of the blood pressure measuring device in the embodiment of the present application can be specifically shown in Figure 3. The width of the wristband 12 is narrower than that of the existing wristband type sphygmomanometer, and is similar to the strap width of an ordinary watch, which is more convenient for users. wear.

As shown in FIG. 4 , the blood pressure measurement device may include a first airbag 121 and a second airbag 122 connected to the wristband 12 . Wherein, the length of the first airbag 121 is less than the circumference of the wristband 12, and the first airbag 121 is used to locally apply pressure to the body part; when the micropump 113 inflates air to the first airbag 121, the second An airbag 121 can be pressed against the arterial area of the user's body to compress the arterial vessel to a flat state, while other parts of the wrist are not compressed by the first airbag 121 .

The second airbag 122 is stacked with the first airbag 121 and is set independently. The second airbag 122 is used to apply pressure around the body part, that is, the second airbag 122 can be arranged around the body part of the user, such as the wrist. part, when the micropump inflates air to the second airbag 122, the second airbag 122 can wrap around and press against the user's wrist.

Fig. 5a is a structural schematic diagram of a wristband of a blood pressure measuring device provided in the embodiment of the present application. As shown in Fig. 5a, the wristband 12 is provided with a first airbag 121, and the first airbag 121 is used to monitor the body Partial pressure is applied to the part, and the flexible array sensor 13 is arranged on the surface of the first airbag 121 away from the wristband.

Fig. 5b is a schematic cross-sectional view of a wristband of the blood pressure measuring device provided in the embodiment of the present application. As shown in FIG. 5 b , the flexible array sensor 13 , the first airbag 121 , the second airbag 122 and the wristband 12 can be sequentially stacked on the user's skin surface. Wherein, the positions of the first airbag 121 and the second airbag 122 can be exchanged.

Fig. 5c is a schematic cross-sectional view of another wristband of the blood pressure measuring device provided in the embodiment of the present application. As shown in Fig. 5c, the first airbag 121 is embedded in the wristband 12, and the flexible array sensor 13 Set on the surface of the wristband. More specifically, the second airbag 122 and the first airbag 121 can be stacked and embedded in the wristband 12 , that is, the wristband 12 is wrapped around the first airbag 121 and the second airbag 122 .

In other embodiments, as shown in FIG. 5d , the first airbag 121 and the second airbag 122 may also be spliced so as to apply pressure around the body parts of the user, which is not limited here. Understandably, when the first airbag 121 and the second airbag 122 are inflated at the same time, the wristband 12 can wrap around and press against the user's wrist. When the micropump 113 only inflates the first airbag 121, the first airbag 121 is pressed tightly on the arterial vessel area of the user's body to achieve local pressure, compressing the arterial vessel to a flat state, and the second airbag 122 is not inflated, in a relaxed state.

The micropump 113 can be used to inflate the airbag to a preset pressure value or to inflate at a preset rate; and/or to deflate the airbag to a preset pressure value or to deflate at a preset rate.

The device body 11 may also include a sensor interface 114 and an air pump interface 115 . Wherein, the sensor interface 114 is the connection port between the pressure sensor 112 and the airbag, and the air pump interface 115 is the interface for the micropump 113 to inflate and deflate the airbag. Exemplarily, the sensor interface 114 can be (Inter-Integrated Circuit, I2C), in addition, can also be other forms, for example Universal Asynchronous Receiver/Transmitter (UART) or serial peripheral interface (Serial Peripheral Interface, SPI), not limited here.

Wherein, the quantity of the air pump interface 115 can be correspondingly configured according to the design of the first airbag 121 and the second airbag 122 , so as to ensure that each airbag can be inflated or deflated by the air pump interface 115 . Preferably, the device body 11 includes a first air pump interface (not shown) and a second air pump interface (not shown), wherein the first air pump interface is used to inflate or deflate the first air bag, and the second air pump interface is used to Inflate or deflate the second air bag. It is not limited here.

The flexible array sensor 13 can be arranged on the surface of the wristband 12 or the surface of the airbag. When the blood pressure measuring device is worn on the user's body, the flexible array sensor 13 contacts the skin surface of the user's arteries and vessels. For example, the flexible array sensor 13 may be positioned over the radial artery region of the wrist. The flexible array sensor 13 may include a plurality of sensors arranged in an array, for example, may include a photoplethysmograph (photoplethysmograph, PPG) sensor, an electrocardiogram (electrocardiogram, ECG) sensor, and a pressure sensor (Pressure Sensor). The flexible array sensor 13 is made of flexible materials, such as polydimethylsiloxane (polydimethylsiloxane, PDMS) flexible material, which can make the flexible array sensor fit better with the human body, and then the flexible array sensor 13 can obtain The pulse oscillatory wave signal is also more accurate, for example, it can be a sensor based on graphene materials.

Each sensor in the flexible array sensor 13 is provided with an identification code, such as Nx, y, wherein, x indicates that the sensor is located in a horizontal position, and y indicates that the sensor is located in a vertical position, such as N _1,5 , indicating that the sensor is located in a horizontal position. 1st, 5th vertically.

In one embodiment, medical personnel or users can manually detect and mark the strongest pulse point at the wrist, for example, mark the wrist with a marker pen, and then stick the flexible array sensor 13 of the measuring device on the marked place. In other embodiments, the point of the strongest pulse at the wrist can also be automatically detected by means of other detection equipment, for example, the point of the strongest pulse at the wrist is detected by means of a movable cylinder piston (single pivoting probe), image acquisition, and the like. Exemplarily, the detection head of the wrist pulse sensor can be brought into contact with the wrist of the human body to detect the frequency of the piston displacement movement to detect the pulse curve.

Further, the flexible array sensor 13 can be located at the center position in the width direction of the wristband 12, which can be understood as the vertical distance from the center point of the flexible array sensor 13 to the two long sides of the wristband 12 is close or equal, and in addition The outer surface of the flexible array sensor 13 may not exceed the contact surface between the wristband 12 and the wrist, and the flexible array sensor 13 may be connected to the printed circuit board where the processor 111 is located through a flexible printed circuit board.

Optionally, the width of the flexible array sensor 13 is less than the width of the wristband, and the length of the flexible array sensor 13 is less than the length of the wristband; on the basis of ensuring the fit between the pulse sensor and the pulse, the measurement error caused by the boundary effect is reduced as much as possible, It is not limited here.

In one embodiment, the flexible array sensor 13 comprises a photocapacitive volumetric description sensor. The photoelectric volume descriptive sensor is capable of monitoring the blood volume change signal of the user's body part. The flexible array sensor 13 transmits the collected blood volume change signal to the processor 111, and the processor 111 calculates the blood pressure according to the blood volume change signal.

In addition, the device body 11 may also include other components to ensure the normal operation of the device body, such as a power supply module 116 , a display component 117 , a wireless power supply module 118 and so on.

The power supply module 116 (such as a battery) can be logically connected to the processor 111 through the power management system, so as to realize the functions of managing charging, discharging, and power consumption management through the power management system.

The display component 117 includes a touch panel and a display screen. The touch panel can collect the user's touch operation on it (such as the user's operation on the touch panel or near the touch panel using any suitable object or accessory such as a finger and a stylus), and drive it according to a preset program Responsive connection means. Optionally, the touch panel may include two parts: a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and sends it to the to the processor 111, and can receive and execute commands sent by the processor 111. In addition, various types of touch panels, such as resistive, capacitive, infrared, and surface acoustic wave, can be used to realize the touch panel. In addition to the touch screen, the device body 11 may also include other input devices, which may include but not limited to function keys (such as volume control keys, switch keys, etc.). The user can directly perform touch input on the touch screen or use physical keys to select and input instructions.

The display screen is used to display information input by or provided to the user and various menus of the watch. Optionally, the display screen may be configured in forms such as a Liquid Crystal Display (LCD for short), an Organic Light-Emitting Diode (OLED for short), and the like.

Further, the touch panel covers the display screen, and when the touch panel detects a touch operation on or near it, it is sent to the processor 111 to determine the type of the touch event, and then the processor 111 displays a touch event on the display screen according to the type of the touch event. The corresponding visual output is provided on . For example, a touch operation in the user interface (such as a single-click operation or a double-tap operation on an icon), or an upward or downward sliding operation in the user interface, or an operation of performing a circle gesture, and so on. In some embodiments, the touch panel and the display screen can be integrated to realize the input and output functions of the blood pressure detection device.

In terms of the blood pressure measurement scenario, when the touch panel detects a touch operation and transmits the touch operation to the processor, the processor processes the touch operation into an original input event (including touch coordinates, time stamp of the touch operation, and other information). The control corresponding to the input event is identified according to the original input event. Take the touch operation as a touch-click operation, and the control corresponding to the click operation is the control of the blood pressure measurement icon as an example. The blood pressure measurement application calls the interface, starts the air pump to inflate the air bag, and collects pressure signals through the pressure sensor.

The wireless power supply module 118, the wireless power supply module 118 includes a power supply coil and a power supply control module. The blood pressure detection device can be used in conjunction with a mobile terminal that has a discharge coil (that is, has a wireless discharge function). The mobile terminal can supply power to the blood pressure detection device 100 through the wireless power supply module 118. The power supply coil is used to induce the discharge coil generated by the mobile terminal. The alternating magnetic field is used to generate an induced oscillating current, and the power supply control module is used to convert the induced oscillating current into a direct current and supply power to the flexible array sensor 13 , the micropump 113 , the pressure sensor 112 and the processor 111 .

The blood pressure measurement device 100 may also include a microphone, a wireless communication module, other sensors, a memory, a timer, etc., wherein the wireless communication module includes a wireless local area network (wireless local area networks, WLAN) (such as a wireless fidelity, Wi-Fi ) network), Bluetooth (bluetooth, BT), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field communication technology (near field communication, NFC), infrared technology (infrared, IR) and other wireless communication solutions, which will not be repeated here.

The microphone (not shown in Figure 4) can convert the collected sound signal into an electrical signal, which is converted into audio data after being received by the audio circuit; the audio circuit can also convert the audio data into an electrical signal, transmit it to the speaker, and convert it into a sound signal by the speaker output.

The blood pressure measurement device 100 can exchange information with other electronic devices (such as mobile phones, tablet computers, etc.) through the Bluetooth module, and connect to the network and server through the above-mentioned electronic devices to process voice recognition and other functions.

Other sensors may include heart rate detection sensors, gravity acceleration sensors, light sensors, motion sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, or other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, which will not be repeated here.

Memory (not shown in FIG. 4 ), used to store software programs and data (for example: exercise information), the processor 111 executes various functional applications and data processing of the blood pressure measurement device 100 by running the software programs and data stored in the memory . The memory mainly includes a program storage area and a data storage area, wherein the program storage area can store the operating system and at least one application program required by a function (such as sound playback function, image playback function, etc.); Created data (such as audio data, phonebook, etc.). In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a magnetic disk storage device, a flash memory device or other volatile solid-state storage devices.

Timer (not shown in Figure 4), the time length of the timer can be dynamically adjusted, for example: when the timer is turned on, the flexible array sensor begins to collect pulse wave oscillation wave signals, and the timer can also be used to control the flexible array sensor to collect pulse oscillations The duration of the wave signal.

The following describes the flow of blood pressure measurement in an embodiment of the present application in combination with the functions of the various components of the blood pressure measurement device:

First, find the approximate location range of the radial artery of the user. Taking the wrist as an example, wrap the wristband around and attach it to the wrist of the user, and ensure that the sensing area of the flexible array sensor covers the area above the radial artery.

Secondly, the processor 111 controls the micropump 113 so that the micropump 113 inflates the second airbag 122 through the air pump interface 115, and the first airbag 121 is not inflated to ensure that the second airbag 122 exerts pressure on the wrist. Preferably, Apply pressure linearly. It is understandable that the user's entire wrist is compressed by the inflation of the wristband. In one embodiment, the linear application of pressure to the wrist can be realized by inflating the second air bag 122 at a constant speed.

During the pressurization process, the second airbag 122 compresses the blood vessels in the user's wrist, blocking the blood flow in the blood vessels, and then the micropump 113 deflates the second airbag 122 slowly, and the blood in the blood vessels flows again. During this process, the vibration changes caused by the blood can reflect the blood pressure changes in the blood vessels. Therefore, the pressure sensor 112 is used to detect the pressure wave signal in the second air bag 122. The sensitive element of the pressure sensor 112 is connected to the second air bag 122. The sensitive element can After acquiring the pressure wave signal of the second airbag 122 , the sensitive element can transmit the pressure wave signal to the pressure sensor 112 through the sensor interface 114 , and the pressure sensor 112 sends the pressure wave signal to the processor 111 .

The processor 111 acquires the pressure wave signal a collected by the pressure sensor, and measures the user's blood pressure using the oscillometric method, and determines the local pressure range required by the first airbag 121 according to the blood pressure value.

As shown in Figure 6, the processor 111 separates the pressure wave signal a to obtain the pulse oscillatory wave signal b, and performs peak fitting to the pulse oscillatory wave signal to obtain the oscillatory wave envelope c; by analyzing the oscillatory wave envelope The functional relationship between blood pressure and the blood pressure value of the user is obtained, and the blood pressure value includes a systolic blood pressure and a diastolic blood pressure. By locating the positions of the derivative extremum point rs on the left and the extremum point rd on the right of the oscillatory wave envelope, the pressures corresponding to rs and rd on the pressure wave baseline are taken as systolic and diastolic blood pressure measurements, respectively. The blood pressure values (measured systolic and diastolic blood pressure) are then used to calculate the appropriate local compression range.

In other embodiments, the blood pressure value can also be calculated by using an improved method of the oscillometric method, such as the variable amplitude coefficient method, the inflection point method and the amplitude coefficient method to determine blood pressure, the coefficient difference ratio method, etc., which are not limited here. The purpose of measuring blood pressure by the oscillometric method is to measure the more real and accurate systolic blood pressure and diastolic blood pressure of the user, so that the local pressurization range can be determined according to the measured systolic blood pressure and diastolic blood pressure.

Exemplarily, when the measured value of the systolic blood pressure of the user is 120 mmHg and the measured value of the diastolic blood pressure is 80 mmHg. Through the blood pressure conversion relationship, the pressurized range is 50-130mmHg, that is, 6659-17313pa.

It should be noted that the blood pressure measurement device provided in this embodiment can be used to first measure the user's more accurate single blood pressure value by using the oscillometric method, and then use the tension method to perform continuous blood pressure measurement; other measurement devices (such as Mercury sphygmomanometer) to obtain the user's more accurate blood pressure value, input the blood pressure value into the blood pressure measuring device provided in this embodiment, and then use the blood pressure measuring device provided in this embodiment to perform continuous blood pressure measurement using the tension method.

Then, the processor 111 controls the micropump 113 through the drive circuit so that the micropump inflates the first airbag 121 through the air pump interface 115 until the pressure in the first airbag 121 reaches the calculated pressure range, so as to treat the user's body parts. Local pressure. At this time, the second airbag 122 is not inflated, and the first airbag 121 presses the radial artery at the user's wrist to a flat state, and the arterial pulse impacts the flexible array sensor covering the surface of the radial artery, causing the flexible array sensor to deform and generate a pulse Oscillating wave signal. It can be understood that the amplitude of the pulse oscillatory wave signal measured outside the arterial vessel has a linear relationship with the arterial blood pressure.

During the process of applying pressure locally, the processor 111 obtains the first sensor which collects the first pulse oscillation wave signal among the flexible array sensors and the second sensor which collects the maximum amplitude of the pulse oscillation wave; when the first sensor If the sensor is not the same as the second sensor, the pulse oscillatory wave signals collected by the first sensor and the second sensor are fused, and the blood pressure value of the user is calculated according to the fused pulse oscillatory wave signals.

Understandably, during the local application of pressure, the processor 111 uses the tension method to measure the blood pressure. Specifically, the processor 111 acquires the pressure wave signal collected by the pressure sensor, separates the pressure wave signal from the pressure wave signal to obtain a linear pressurized baseline signal, and obtains a linear pressurized baseline signal according to the fused pulse oscillation wave signal and the linear pressurized baseline signal. Calculate blood pressure. For example, by extracting the pulse oscillatory wave peak sequence to fit the oscillatory wave envelope, find the envelope peak point, determine the two inflection points around the envelope peak value, and then obtain the two inflection points respectively on the pulse oscillatory wave signal envelope The corresponding first time point and second time point, and then according to the determined first time point and second time point corresponding pressure in the linear pressurized baseline signal as systolic blood pressure measurement value and diastolic blood pressure measurement value respectively.

The pressure wave signal can represent blood pressure changes in blood vessels, and can include a baseline component and a dynamic signal component. The processor 111 can bandpass filter the pressure wave signal to obtain a pulse oscillation wave signal, which is the dynamic signal component in the pressure wave signal. After removing the pulse oscillation wave signal from the pressure wave signal, the linear pressurized baseline signal can be obtained, which is the baseline component in the pressure wave signal. Wherein, the passband of the bandpass filter can be set to 0.5-10Hz (Hertz). The measured value corresponding to the diastolic blood pressure time point in the baseline component of the pressure wave signal is the diastolic blood pressure measured value, and the corresponding measured value of the systolic blood pressure time point in the baseline component of the pressure wave signal is the systolic blood pressure measured value.

If the first sensor and the second sensor are the same sensor, the blood pressure value of the user is determined according to the pulse oscillation wave signal and the pressure wave signal collected by the sensor.

The following is a schematic flowchart of a method for measuring blood pressure provided in the embodiment of the present application. As shown in Figure 7, the method may specifically include:

Step S01, acquiring the pressure range required to be applied by the first airbag, wherein the first airbag is connected with a pressure sensor.

In one embodiment, the acquisition of the pressure range required to be applied by the first air bag of the blood pressure measurement device includes:

Inflating and pressurizing the second airbag to apply surrounding pressure to the body part of the user, wherein the second airbag is connected to the pressure sensor; during the surrounding pressure application, the pressure sensor The collected pressure wave signal in the second airbag; separate the pulse oscillatory wave signal from the pressure wave signal, and perform peak fitting on the pulse oscillatory wave signal to obtain the oscillatory wave envelope; by analyzing the The functional relationship between the envelope of the oscillation wave and the blood pressure is used to obtain the blood pressure value of the user; the pressure range required to be applied by the first air bag is determined according to the blood pressure value.

Specifically, the processor 111 controls the micropump 113 so that the micropump 113 inflates the second airbag 122 through the air pump interface 115, and the second airbag 122 is used to apply pressure around the body part, preferably , in a linear way of applying pressure. It is understandable that the user's entire wrist is compressed by the inflation of the wristband. In one embodiment, the linear application of pressure to the wrist can be achieved by inflating the airbag 12 at a constant speed.

During the pressurization process, the second airbag 122 compresses the blood vessels in the user's wrist, blocking the blood flow in the blood vessels, and then the micropump 113 deflates the second airbag 122 slowly, and the blood in the blood vessels flows again. During this process, the vibration changes caused by the blood can reflect the blood pressure changes in the blood vessels. Therefore, the pressure sensor 112 is used to detect the pressure wave signal in the air bag. The sensitive element of the pressure sensor 112 is connected to the air bag, and the sensitive element can obtain the pressure in the air bag. After that, the sensitive element can transmit the pressure wave signal to the pressure sensor 112 through the sensor interface 114 , and the pressure sensor 112 sends the pressure wave signal to the processor 111 .

The processor 111 acquires the pressure wave signal a collected by the pressure sensor, and measures the user's blood pressure using the oscillometric method, and determines the local pressure range required by the first airbag 121 according to the blood pressure value.

As shown in Figure 6, the processor 111 separates the pressure wave signal a to obtain the pulse oscillatory wave signal b, and performs peak fitting to the pulse oscillatory wave signal to obtain the oscillatory wave envelope c; by analyzing the oscillatory wave envelope The functional relationship between blood pressure and the blood pressure value of the user is obtained, and the blood pressure value includes a systolic blood pressure and a diastolic blood pressure. By locating the position of the derivative extremum point rs on the left and the extremum point rd on the right of the oscillatory wave envelope, the pressures corresponding to rs and rd on the pressure wave baseline are taken as the systolic and diastolic blood pressure measurements, respectively. The blood pressure values (measured systolic and diastolic blood pressure) were then used to calculate the appropriate local compression range.

In other embodiments, the blood pressure value can also be calculated by using an improved method of the oscillometric method, such as the variable amplitude coefficient method, the inflection point method and the amplitude coefficient method to determine blood pressure, the coefficient difference ratio method, etc., which are not limited here. The purpose of measuring blood pressure by the oscillometric method is to measure the more real and accurate systolic blood pressure and diastolic blood pressure of the user, so that the local pressurization range can be determined according to the measured systolic blood pressure and diastolic blood pressure.

Exemplarily, when the measured value of the systolic blood pressure of the user is 120 mmHg and the measured value of the diastolic blood pressure is 80 mmHg. Through the blood pressure conversion relationship, the pressurized range is 50-130mmHg, that is, 6659-17313pa.

In one embodiment, the acquiring the pressure range required to be applied by the first air bag of the blood pressure measuring device includes: acquiring the input blood pressure value of the user to be monitored; calculating the first blood pressure value according to a preset blood pressure conversion relationship. The range of locally applied pressure required by a balloon.

It should be noted that the blood pressure measurement device provided in this embodiment can be used to measure the user's more accurate single blood pressure value first by using the oscillometric method, and then use the tension method for continuous blood pressure measurement; the blood pressure value can also be input into this embodiment Provided blood pressure measurement device, and then use the blood pressure measurement device provided in this embodiment to carry out continuous blood pressure measurement using the tension method, wherein the input blood pressure value can be the more accurate user's blood pressure obtained by using other measurement devices (such as mercury sphygmomanometers) blood pressure value.

Step S02 , inflating and pressurizing the first airbag, so that the pressure in the first airbag is adjusted to the pressure range, so as to exert local pressure on the body parts of the user.

Specifically, the processor controls the micropump to inflate the first airbag 121 corresponding to the position of the flexible array sensor, so as to apply local pressure to the arterial blood vessel to a certain pressure range. At this time, the first airbag 121 compresses the The radial artery at the wrist of the user is in a flat state, and the arterial pulse impacts the flexible array sensor covering the surface of the radial artery, causing deformation of the flexible array sensor and generating a pressure pulse oscillation wave signal. It can be understood that the second airbag 122 is not inflated, and the first airbag 121 compresses the arterial area instead of compressing the entire wrist of the user, thereby reducing discomfort. It should be noted that the amplitude of the pulse oscillatory wave signal measured outside the arterial vessel has a linear relationship with the arterial blood pressure.

It can be understood that the flexible array sensor is a plurality of sensors arranged on the wristband in a rectangular array or a circular array. Among them, the rectangular array refers to distributing the objects in rows and columns; the circular array refers to distributing the objects at equal angles around the center of the array.

In this embodiment, the flexible array sensor is a sensor module arranged in a rectangular array. It can be understood that during the heartbeat cycle, the blood flowing through the arterioles, capillaries and venules in the peripheral blood vessels is correspondingly pulsating. Variety. The blood volume is greatest when the heart contracts and smallest when the heart relaxes. This pulsating change of blood volume can generally be obtained by a photoelectric volume sensor, and the obtained waveform contains volume pulse blood flow information. Therefore, systolic blood pressure and diastolic blood pressure can be obtained through the relationship between volume pulse blood flow information and blood pressure signal. This method is called photoplethysmography (Photo Plethysmo Graphy, PPG).

Due to the absorption and attenuation effect of fingertip skin muscle tissue and blood, the light intensity detected by the photoelectric receiver will be weakened. The absorption of light by the skin, muscles and tissues remains constant throughout the blood circulation, while the blood volume in the skin changes pulsatingly under the action of heart contraction and relaxation. When the heart contracts, the peripheral vascular blood volume is the largest, the light absorption is also the largest, and the detected light intensity is the smallest; while in diastole, on the contrary, the peripheral vascular blood volume is the smallest, and the detected light intensity is the largest, so that the photoelectric receiver can detect The received light intensity changes in a pulsating manner accordingly. Then the light intensity change signal is converted into an electric signal, and the change of volume pulse and blood flow can be obtained after the electric signal is amplified.

Step S03, during the local pressure application process, obtain the first sensor that first collects the pulse oscillatory wave signal among the flexible array sensors, and obtain the second sensor that collects the pulse oscillatory wave signal with the largest amplitude; wherein, the The flexible array sensor is in contact with the skin surface of the user's arterial vascular region.

Specifically, during the collection process, the sensor that records the first collected pulse oscillatory wave signal is referred to as the first sensor, and the sensor that records and collects the pulse oscillatory wave signal with the largest amplitude is recorded as the second sensor.

When the measuring device is measuring blood pressure, the flexible array sensor is located in the radial artery area of the user's wrist, and is pressed against the user's skin surface with a preset pressure range. The preset pressure range can compress the radial artery at the wrist of the user to a flat state, and the arterial pulse will impact the flexible array sensor covering the surface of the radial artery, causing the flexible array sensor to deform and generate a pressure pulse oscillating wave signal.

Step S04, when the first sensor and the second sensor are not the same sensor, fuse the pulse oscillatory wave signals collected by the first sensor and the second sensor.

Specifically, when the identification codes of the first sensor and the second sensor are consistent, it is confirmed that the first sensor and the second sensor are the same sensor.

For example, if the identification codes of the first sensor and the second sensor are both N _1,5 , then they are the same sensor, indicating that only one sensor in the flexible array sensor is pressing above the artery, as shown in Figure 8a. At this time, sensor B is positive Press just above the radial artery.

When the identification codes of the first sensor and the second sensor are inconsistent, for example, the identification code of the first sensor is N _1,5 and the identification code of the second sensor is N _2,5 , then the first sensor and the second sensor The sensor is not the same sensor. As shown in Figure 8b, two adjacent sensors (sensor B and sensor C) in the flexible array sensor are placed side by side and pressed together on the artery, and two pulse oscillatory wave signals need to be extracted for fusion calculation.

In one embodiment, the pulse oscillatory wave signals collected by the first sensor and the second sensor are fused according to a preset weight ratio, and the blood pressure value of the user is calculated according to the fused pulse oscillatory wave signals. For example, the pulse oscillating wave signal collected by the first sensor is the first signal (S1), the pulse oscillating wave signal collected by the second sensor is the second signal (S2), and the weight of the first signal is m1, and the weight of the second signal is m1. The weight of the road signal is m2, then the fused pulse oscillatory wave signal Scombine=m1S1+m2S2

In another embodiment, the pulse oscillatory wave signals collected by the first sensor and the second sensor are fused according to the summing and averaging method, and the blood pressure value of the user is calculated according to the fused pulse oscillatory wave signals. For example, the pulse oscillating wave signal collected by the first sensor is the first signal (S1), the pulse oscillating wave signal collected by the second sensor is the second signal (S2), and the fused pulse oscillating wave signal Scombine=(S1+ S2)/2.

Step S05, calculating the blood pressure value of the user according to the fused pulse oscillation wave signal and the pressure wave signal collected by the pressure sensor.

Specifically, obtain the fused pulse oscillatory wave signal, perform peak fitting on the fused pulse oscillatory wave signal, obtain the envelope of the oscillatory wave, find the peak point of the envelope, and determine two inflection points around the peak of the envelope, Then obtain the first time point and the second time point corresponding to the two inflection points in the pulse shock wave signal envelope; obtain the pressure wave signal collected by the pressure sensor during the local application of pressure, from the pressure wave signal The linear pressurization baseline signal is obtained through separation, and then the corresponding pressures in the linear pressurization baseline signal at the determined first time point and the second time point are respectively used as the systolic blood pressure measurement value and the diastolic blood pressure measurement value.

The embodiment of the present application also provides a blood pressure measuring device, the device comprising:

a first acquiring unit, configured to acquire a pressure range required to be applied by the first airbag, wherein the first airbag is connected to a pressure sensor;

a pressurizing unit, configured to inflate and pressurize the first airbag, so that the pressure in the first airbag is adjusted to the pressure range, so as to locally exert pressure on the body parts of the user;

The second acquisition unit is configured to acquire the first sensor that first collects the pulse oscillatory wave signal among the flexible array sensors during the local pressure application process, and acquire the second sensor that collects the pulse oscillatory wave signal with the largest amplitude; Wherein, the flexible array sensor is in contact with the skin surface of the user's arterial vessel region;

A fusion unit, configured to fuse the pulse oscillatory wave signals collected by the first sensor and the second sensor when the first sensor and the second sensor are not the same sensor;

The first calculation unit is configured to calculate the blood pressure value of the user according to the fused pulse oscillation wave signal and the pressure wave signal collected by the pressure sensor.

In the above solution, local pressure is applied to the body parts according to the obtained pressure range, so that when the user's arterial blood vessel is compressed to a flat state, the amplitude of the pulse oscillation wave signal measured outside the arterial blood vessel is linearly related to the arterial blood pressure, thereby The user's blood pressure is continuously measured using the tonometry method. Therefore, the comfort and accuracy of continuous blood pressure measurement can be improved.

Further, the device further includes a measuring unit, which is used to inflate and pressurize the second airbag to pressurize the body part of the user in a surrounding manner, wherein the second airbag is connected with the pressure sensor; During the pressurization process, the pressure wave signal in the second air bag collected by the pressure sensor is obtained; and the linear pressurized baseline signal and the pulse oscillation wave signal are separated from the pressure wave signal, and the pulse Perform peak fitting on the oscillatory wave signal to obtain an oscillatory wave envelope; obtain the blood pressure value of the user by analyzing the functional relationship between the oscillatory wave envelope and blood pressure; determine the required pressure of the first airbag according to the blood pressure value Applied pressure range.

Specifically, the processor 111 controls the micropump 113 so that the micropump 113 inflates the second airbag 122 through the air pump interface 115, and the second airbag 122 is used to apply pressure around the body part, preferably , in a linear way of applying pressure. It is understandable that the user's entire wrist is compressed by the inflation of the wristband. In one embodiment, the linear application of pressure to the wrist can be achieved by inflating the airbag 12 at a constant speed.

During the pressurization process, the second airbag 122 compresses the blood vessels in the user's wrist, blocking the blood flow in the blood vessels, and then the micropump 113 deflates the second airbag 122 slowly, and the blood in the blood vessels flows again. During this process, the vibration changes caused by the blood can reflect the blood pressure changes in the blood vessels. Therefore, the pressure sensor 112 is used to detect the pressure wave signal in the air bag. The sensitive element of the pressure sensor 112 is connected to the air bag, and the sensitive element can obtain the pressure in the air bag. After that, the sensitive element can transmit the pressure wave signal to the pressure sensor 112 through the sensor interface 114 , and the pressure sensor 112 sends the pressure wave signal to the processor 111 .

The processor 111 acquires the pressure wave signal a collected by the pressure sensor, and measures the user's blood pressure using the oscillometric method, and determines the local pressure range required by the first airbag 121 according to the blood pressure value.

As shown in Figure 6, the processor 111 separates the pressure wave signal a to obtain the pulse oscillatory wave signal b, and performs peak fitting to the pulse oscillatory wave signal to obtain the oscillatory wave envelope c; by analyzing the oscillatory wave envelope The functional relationship between blood pressure and the blood pressure value of the user is obtained, and the blood pressure value includes a systolic blood pressure and a diastolic blood pressure. By locating the position of the derivative extremum point rs on the left and the extremum point rd on the right of the oscillatory wave envelope, the pressures corresponding to rs and rd on the pressure wave baseline are taken as the systolic and diastolic blood pressure measurements, respectively. The blood pressure values (measured systolic and diastolic blood pressure) were then used to calculate the appropriate local compression range.

In other embodiments, the blood pressure value can also be calculated by using an improved method of the oscillometric method, such as the variable amplitude coefficient method, the inflection point method and the amplitude coefficient method to determine blood pressure, the coefficient difference ratio method, etc., which are not limited here. The purpose of measuring blood pressure by the oscillometric method is to measure the more real and accurate systolic blood pressure and diastolic blood pressure of the user, so that the local pressurization range can be determined according to the measured systolic blood pressure and diastolic blood pressure.

Exemplarily, when the measured value of the systolic blood pressure of the user is 120 mmHg and the measured value of the diastolic blood pressure is 80 mmHg. Through the blood pressure conversion relationship, the pressurized range is 50-130mmHg, that is, 6659-17313pa.

In one embodiment, the acquiring the pressure range required to be applied by the first air bag of the blood pressure measuring device includes: acquiring the input blood pressure value of the user to be monitored; calculating the first blood pressure value according to a preset blood pressure conversion relationship. The range of locally applied pressure required by a balloon.

It should be noted that the blood pressure measurement device provided in this embodiment can be used to measure the user's more accurate single blood pressure value first by using the oscillometric method, and then use the tension method for continuous blood pressure measurement; the blood pressure value can also be input into this embodiment Provided blood pressure measurement device, and then use the blood pressure measurement device provided in this embodiment to carry out continuous blood pressure measurement using the tension method, wherein the input blood pressure value can be the more accurate user's blood pressure obtained by using other measurement devices (such as mercury sphygmomanometers) blood pressure value.

Specifically, the device further includes a receiving unit and a conversion unit, the receiving unit is used to receive the input blood pressure value of the user to be measured; the conversion unit is used to obtain the pressure range according to the preset blood pressure conversion relationship. For example, input the user's blood pressure values of 120mmHg and 80mmHg into the blood pressure measuring device; according to the preset blood pressure conversion relationship, the pressurized range is 50-130mmHg, that is, 6659-17313pa.

During the local pressurization process, the airbag compresses the radial artery at the user's wrist to a flat state, and the arterial pulse impacts the flexible array sensor covering the surface of the radial artery, causing the flexible array sensor to deform and generate a pressure pulse oscillation wave signal. Understandably, the partial airbag compresses the arterial blood vessel instead of compressing the user's entire wrist, reducing discomfort.

The device further includes a judging unit, configured to confirm that the first sensor and the second sensor are the same sensor when the identification codes of the first sensor and the second sensor are consistent.

For example, if the identification codes of the first sensor and the second sensor are both N _1,5 , then they are the same sensor, indicating that only one sensor in the flexible array sensor is pressing above the artery, as shown in Figure 8a. At this time, sensor B is positive Press just above the radial artery.

When the identification codes of the first sensor and the second sensor are inconsistent, for example, the identification code of the first sensor is N _1,5 and the identification code of the second sensor is N _2,5 , then the first sensor and the second sensor The sensor is not the same sensor. As shown in Figure 8b, two adjacent sensors (sensor B and sensor C) in the flexible array sensor are placed side by side and pressed together on the artery, and two pulse oscillatory wave signals need to be extracted for fusion calculation.

The fusion unit also includes a first fusion subunit and a second fusion subunit.

The first fusion subunit is configured to fuse the pulse oscillatory wave signals collected by the first sensor and the second sensor according to a preset weight ratio, and calculate the blood pressure value of the user according to the fused signals. For example, the pulse oscillating wave signal collected by the first sensor is the first signal (S1), the pulse oscillating wave signal collected by the second sensor is the second signal (S2), and the weight of the first signal is m1, and the weight of the second signal is m1. The weight of the road signal is m2, then the fused pulse oscillatory wave signal Scombine=m1S1+m2S2

The first fusion subunit is configured to fuse the pulse oscillatory wave signals collected by the first sensor and the second sensor according to the summation and averaging method, and calculate the blood pressure value of the user according to the fused signals. For example, the pulse oscillating wave signal collected by the first sensor is the first signal (S1), the pulse oscillating wave signal collected by the second sensor is the second signal (S2), and the fused pulse oscillating wave signal Scombine=(S1+ S2)/2.

The fused pulse oscillatory wave signal is obtained, and peak fitting is performed on the fused pulse oscillatory wave signal to obtain an oscillatory wave envelope. By locating the position of the derivative extremum point rs on the left and the derivative extremum point rd on the right of the peak value of the envelope of the oscillatory wave, the pressures corresponding to rs and rd on the pressure wave baseline are taken as the systolic and diastolic blood pressure measurements, respectively.

The first calculation unit is also used to obtain the fused pulse oscillatory wave signal, perform peak fitting on the fused pulse oscillatory wave signal, obtain the envelope of the oscillatory wave, find the peak point of the envelope, and determine the peak value of the envelope two inflection points, and then respectively obtain the first time point and the second time point corresponding to the two inflection points in the pulse shock wave signal envelope; obtain the pressure wave signal collected by the pressure sensor during the local application of pressure, from The pressure wave signal is separated to obtain a linear pressurized baseline signal, and then the corresponding pressures in the linear pressurized baseline signal according to the determined first time point and second time point are respectively used as measured values of systolic blood pressure and measured values of diastolic blood pressure.

The second calculation unit is configured to calculate the blood pressure value of the user according to the pulse oscillation wave signal and the pressure wave signal collected by the first sensor when the first sensor and the second sensor are the same sensor.

The present invention can be applied to wearable or household products to continuously monitor the user's blood pressure, and can also be used in professional medical scenarios. It can be used as an auxiliary device for the oscillometric dynamic blood pressure monitor, reducing the number of times the dynamic blood pressure monitor is inflated and pressurized, and improving the user's blood pressure. Comfort during continuous measurement. The embodiment provided by the present invention makes full use of the advantages of the two methods of oscillometric method and tensometry method. During the measurement process, two different signals pressed on the blood vessel are fused to improve the accuracy of blood pressure data.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

The foregoing is only a specific implementation of the present application. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should be covered by the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims (16)

1. The blood pressure measuring device is characterized by comprising a device body, a wrist strap, a first air bag connected with the wrist strap and a flexible array sensor; the device body comprises a processor, a pressure sensor and a micropump;

the flexible array sensor and the pressure sensor are respectively connected with the processor; the wrist strap is used for encircling and fixing the device body on a body part of a user to be monitored;

the flexible array sensor is in contact with a skin surface of an arterial vessel region of the user, the flexible array sensor comprising at least one sensor;

The length of the first air bag is smaller than the circumference of the wrist strap, and the first air bag is used for locally pressing the body part;

the micropump is used for inflating or deflating the first air sac;

the pressure sensor is used for collecting pressure wave signals in the first air bag in the process of inflating the micropump;

the processor is used for acquiring a pressure range required to be applied by the first air bag; controlling the micropump to inflate the first balloon such that the pressure within the first balloon is adjusted to the pressure range to locally apply pressure to the body part;

in the process of local pressure application, the processor acquires a first sensor which acquires a pulse oscillation wave signal for the first time in the flexible array sensor; the processor acquires a second sensor for acquiring a pulse oscillation wave signal with the maximum amplitude;

when the first sensor and the second sensor are not the same sensor, fusing pulse oscillation wave signals acquired by the first sensor and the second sensor; calculating the blood pressure value of the user according to the fused pulse oscillation wave signal and the pressure wave signal;

When the first sensor and the second sensor are the same sensor, calculating the blood pressure value of the user according to the pulse oscillation wave signal and the pressure wave signal acquired by the first sensor.

2. The blood pressure measurement device of claim 1, further comprising a second bladder coupled to the wristband, the second bladder being layered with and separately disposed from the first bladder, the second bladder being configured to circumferentially compress the body part;

the processor is further used for controlling the micropump to inflate the second airbag;

the processor is also used for acquiring pressure wave signals in the second air bag acquired by the pressure sensor in the surrounding type pressure applying process;

separating from the pressure wave signal to obtain a pulse oscillation wave signal, and performing peak fitting on the pulse oscillation wave signal to obtain an oscillation wave envelope;

obtaining a blood pressure value of the user by analyzing a functional relation between the oscillation wave envelope and the blood pressure;

and determining the pressure range required to be locally applied by the first air bag according to the blood pressure value.

3. The blood pressure measurement device of claim 1, wherein the first bladder is embedded within the wristband, the flexible array sensor being disposed on a surface of the wristband; or the first air bag is arranged on the surface of the wrist strap, and the flexible array sensor is arranged on the surface, far away from the wrist strap, of the first air bag.

4. The blood pressure measurement device of claim 1, wherein the processor is further configured to obtain an input blood pressure value of the user to be monitored; and calculating according to a preset blood pressure conversion relation to obtain the pressure range required to be locally applied by the first air bag.

5. The blood pressure measurement device of claim 1, wherein the processor is further configured to obtain identification codes of the first sensor and the second sensor; and when the identification codes of the first sensor and the second sensor are consistent, confirming that the first sensor and the second sensor are the same sensor.

6. The blood pressure measurement device according to any one of claims 1 to 5, wherein the processor is further configured to fuse pulse oscillation wave signals acquired by the first sensor and the second sensor according to a preset weight ratio.

7. The blood pressure measurement device according to any one of claims 1 to 5, wherein the processor is further configured to fuse pulse oscillation wave signals acquired by the first sensor and the second sensor according to an addition and average method.

8. The blood pressure measurement device of claim 1, wherein the processor is further configured to obtain a pressure wave signal acquired by the pressure sensor during a local pressure application process, separate a linear pressurization baseline signal from the pressure wave signal, and calculate a blood pressure value according to the fused pulse oscillation wave signal and the linear pressurization baseline signal.

9. The blood pressure measurement device of claim 1, wherein the flexible array sensor is a rectangular array sensor, the flexible array sensor comprising a photoplethysmography sensor.

10. An electronic device comprising a memory, a processor and a software program stored in the memory and executable on the processor, characterized in that the processor implements the following steps when executing the software program:

acquiring a pressure range required to be applied by a first air bag, wherein the first air bag is connected with a pressure sensor;

inflating and pressurizing the first air bag, so that the pressure in the first air bag is regulated to the pressure range to locally pressurize the body part of the user;

in the process of local pressure application, a first sensor which acquires pulse oscillation wave signals for the first time in the flexible array sensor is acquired, and a second sensor which acquires pulse oscillation wave signals with the maximum amplitude is acquired; wherein the flexible array sensor is in contact with a skin surface of an arterial vessel region of a user;

when the first sensor and the second sensor are not the same sensor, fusing pulse oscillation wave signals acquired by the first sensor and the second sensor; calculating the blood pressure value of the user according to the fused pulse oscillation wave signals and the pressure wave signals acquired by the pressure sensor;

When the first sensor and the second sensor are the same sensor, calculating the blood pressure value of the user according to the pulse oscillation wave signal and the pressure wave signal acquired by the first sensor.

11. The electronic device of claim 10, wherein the processor, when executing the software program, implements the step of obtaining a range of pressure required to be applied by the first bladder of the blood pressure measurement apparatus, comprising:

inflating a second bladder to circumferentially compress the body part of the user, wherein the second bladder is coupled to the pressure sensor;

acquiring pressure wave signals in the second air bag acquired by the pressure sensor in the surrounding type pressure applying process;

separating from the pressure wave signal to obtain a pulse oscillation wave signal, and performing peak fitting on the pulse oscillation wave signal to obtain an oscillation wave envelope;

obtaining a blood pressure value of the user by analyzing a functional relation between the oscillation wave envelope and the blood pressure;

and determining the pressure range required to be applied by the first air bag according to the blood pressure value.

12. The electronic device of claim 10, wherein the processor, when executing the software program, implements the step of obtaining a range of pressure required to be applied by the first bladder of the blood pressure measurement apparatus, comprising:

Acquiring an input blood pressure value of a user to be monitored; and calculating according to a preset blood pressure conversion relation to obtain the pressure range required to be locally applied by the first air bag.

13. The electronic device of claim 10, wherein the processor when executing the software program further performs the following steps before fusing pulse wave signals acquired by the first sensor and the second sensor when the first sensor and the second sensor are not the same sensor:

acquiring identification codes of the first sensor and the second sensor;

and when the identification codes of the first sensor and the second sensor are consistent, confirming that the first sensor and the second sensor are the same sensor.

14. The electronic device according to any one of claims 10 to 13, wherein the step of fusing pulse oscillation wave signals acquired by the first sensor and the second sensor when the first sensor and the second sensor are not the same sensor is implemented by the processor executing the software program, includes:

and fusing pulse oscillation wave signals acquired by the first sensor and the second sensor according to a preset weight proportion.

15. The electronic device according to any one of claims 10 to 13, wherein the step of fusing pulse oscillation wave signals acquired by the first sensor and the second sensor when the first sensor and the second sensor are not the same sensor is implemented by the processor executing the software program, includes:

and fusing pulse oscillation wave signals acquired by the first sensor and the second sensor according to an addition and average method.

16. The electronic device of claim 10, wherein the processor, when executing the software program, implements the step of calculating the blood pressure value of the user from the fused pulse wave signal and the pressure wave signal acquired by the pressure sensor, comprising:

acquiring pressure wave signals acquired by the pressure sensor in the process of local pressure application, and separating the pressure wave signals to obtain linear pressure baseline signals;

and calculating to obtain a blood pressure value according to the fused pulse oscillation wave signal and the linear pressurization baseline signal.

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