CN113520357A

CN113520357A - Blood pressure measuring device and method

Info

Publication number: CN113520357A
Application number: CN202010306758.3A
Authority: CN
Inventors: 王少健; 李靖; 黄振龙; 张慧; 何小祥
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2021-10-22
Anticipated expiration: 2040-04-17
Also published as: CN113520357B; WO2021208745A1

Abstract

The embodiment of the application provides a blood pressure measuring method and a blood pressure measuring device, wherein the method comprises the steps of obtaining a pressure range required to be applied by a first air bag; inflating the first bladder such that a pressure within the first bladder is adjusted to a pressure range to apply localized pressure to the body part; in the process of local pressure application, a first sensor which acquires a pulse oscillation wave signal in the flexible array sensor is obtained, and a second sensor which acquires the pulse oscillation wave signal with the maximum amplitude is obtained; and when the first sensor and the second sensor are not the same sensor, fusing the pulse oscillation wave signals acquired by the first sensor and the second sensor, and calculating the blood pressure value of the user according to the fused pulse oscillation wave signals and the fused pressure wave signals. The blood pressure measuring method and the device provided by the embodiment of the application can improve the comfort level of continuous blood pressure measurement.

Description

Blood pressure measuring device and method

Technical Field

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

Background

The human blood pressure refers to the pressure which is generated by the pulsating blood flow in the blood vessel and is laterally vertical to the blood vessel wall, wherein the peak value of the pressure is systolic pressure and can also be called high pressure, and the valley value of the pressure is diastolic pressure and can also be called low pressure. Blood pressure is an important index for health monitoring, and can reflect the health condition of a human body, so how to conveniently measure blood pressure is a hot problem.

At present, the blood pressure is measured by a commonly used wrist type blood pressure monitor, the wrist type blood pressure monitor comprises an air bag, an air pump and a pressure sensor, and the wrist type blood pressure monitor is based on the oscillography principle: the air pump inflates the balloon, causing the balloon to inflate under pressure, compressing the radial artery of the wrist. The pressure sensor integrated in the instrument is communicated with the air bag, and can extract pulse oscillation wave signals due to the fact that the radial artery is compressed in the inflating and pressure boosting processes, and the blood pressure is calculated according to the characteristics of the extracted pulse oscillation wave signals. But wrist formula sphygmomanometer structure is complicated, and equipment volume is great, is difficult for carrying, measures the comfort level and experiences relatively poorly, is difficult to satisfy long-time continuous measurement's demand.

Another watch type sphygmomanometer is used for pressurizing by manually determining the position of a radial artery and adopting a mechanical pump mode. Blood pressure measurement is generally based on the principle of the tension method: applying external pressure to the body surface artery part to change the internal peripheral stress (tension) of the blood vessel; when the external force reaches a certain specific value, the blood vessel is in a flat state, the pressure in the blood vessel is equal to the external force, and 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 the blood pressure value can be estimated according to the pressure wave. However, it is difficult to ensure that the pressure sensor is accurately positioned right above the flattened part of the artery to be measured during the measurement process, and extensive and long-term wrist compression tends to cause discomfort to the user during continuous measurement.

Disclosure of Invention

The embodiment of the invention provides a blood pressure measuring device and method, which can be suitable for continuous measurement and can improve the comfort level of blood pressure measurement.

In view of this, a first aspect of the embodiments of the present application provides a blood pressure measuring device, which includes a device body, a wrist strap, a first air bag connected to 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 fixing the device body on the body part of the user to be monitored in a surrounding manner;

a flexible array sensor in contact with a skin surface of an arterial vessel region of a 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 applying pressure to a body part;

the micro pump is used for inflating the first air bag or deflating the first air bag;

the pressure sensor is used for acquiring pressure wave signals in the first air bag in the process of inflating or deflating the micro pump;

the processor is used for acquiring a pressure range required to be applied by the first air bag; controlling the micro pump to inflate the first air bag, so that the pressure in the first air bag is adjusted to a pressure range, and local pressure is applied to the body part;

in the process of local pressure application, a processor acquires a first sensor which acquires a pulse oscillation wave signal from a flexible array sensor;

the processor acquires a second sensor of the pulse oscillation wave signal with the maximum amplitude value;

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;

and calculating the blood pressure value of the user according to the fused pulse oscillation wave signal and the fused pressure wave signal.

In the scheme, the local pressure is applied to the body part according to the acquired pressure range, so that when the arterial blood vessel of the user is compressed to a flat state, the amplitude of the pulse oscillation wave signal obtained by the measurement outside the arterial blood vessel and the arterial blood pressure are in a linear relation, and the blood pressure of the user is continuously measured by using a tension method. Thereby improving the comfort and accuracy of continuous blood pressure measurement.

In one embodiment, the blood pressure measuring device further comprises a second air bag connected with the wrist strap, the second air bag and the first air bag are stacked and are respectively and independently arranged, and the second air bag is used for applying pressure to the body part in a surrounding mode;

the processor is also used for controlling the micro pump to inflate the second air bag, and the first air bag is not inflated;

in the surrounding type pressure application process, the processor is further used for acquiring pressure wave signals in the second air bag, which are acquired by the pressure sensor;

separating the pressure wave signals to obtain pulse oscillation wave signals, and performing wave crest fitting on the pulse oscillation wave signals to obtain oscillation wave envelopes;

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

the range of pressure required to be locally applied by the first bladder is determined based on 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 air bag is arranged on the surface of the wrist strap, and the flexible array sensor is arranged on the surface of the first air bag far away from the wrist strap.

In one embodiment, the processor is further configured to obtain an input blood pressure value of the user to be monitored; and calculating the local applied pressure range of the first air bag according to a preset blood pressure conversion relation.

In one embodiment, the processor is further configured to acquire 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, the first sensor and the second sensor are confirmed to be the same sensor.

Through obtaining the identification code, can discern fast whether first sensor and second sensor are same sensor, it is high-efficient quick.

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

For example, the pulse oscillation wave signal collected by the first sensor is the first signal (S1), the pulse oscillation 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 m2, so that the fused pulse oscillation wave signal Scombine is m1S1+ m2S2

In one embodiment, the processor is further configured to fuse the pulse oscillation wave signals acquired by the first sensor and the second sensor according to an addition and average method.

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

In one embodiment, the processor is further configured to acquire a pressure wave signal acquired by the pressure sensor during the local pressurization, separate the pressure wave signal into a linear pressurization baseline signal, and calculate a blood pressure value according to the fused pulse oscillation wave signal and the linear pressurization baseline signal.

In one embodiment, the processor is further configured to calculate a blood pressure value of the user according to the pulse oscillation wave signal and the pressure wave signal acquired 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, the flexible array sensor comprising a photoplethysmographic sensor.

In view of this, a second aspect of the embodiments of the present application provides a blood pressure measuring method, including:

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 adjusted to a pressure range to locally apply pressure to the body part of the user;

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

and calculating the blood pressure value of the user according to the fused pulse oscillation wave signal and the pressure wave signal acquired by the pressure sensor.

In one embodiment, obtaining a range of pressures that a first balloon of a blood pressure measurement device is required to apply includes:

inflating a second bladder to apply pressure around the body part of the user, wherein the second bladder is connected to the pressure sensor;

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

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

acquiring an input blood pressure value of a user to be monitored; and calculating the local applied pressure range of the first air bag according to a preset blood pressure conversion relation.

In one embodiment, before fusing the 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, the method further includes:

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

and when the identification codes of the first sensor and the second sensor are consistent, the first sensor and the second sensor are confirmed to be the same sensor.

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

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

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

In one embodiment, the processor calculates a blood pressure value of the user according to the fused pulse oscillation wave signal and the pressure wave signal collected by the pressure sensor, and includes:

acquiring pressure wave signals acquired by a pressure sensor in a local pressure application process, 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.

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.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

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

FIG. 2 is a schematic diagram of a prior art wristwatch type sphygmomanometer;

fig. 3 is a schematic view of an application scenario of a blood pressure measuring device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a blood pressure measuring device according to an embodiment of the present invention;

FIG. 5a is a schematic view of a wrist band of a blood pressure measuring device according to an embodiment of the present disclosure;

FIG. 5b is a schematic cross-sectional view of a wrist band of the blood pressure measuring device according to the present invention;

FIG. 5c is a schematic cross-sectional view of another wrist band of the blood pressure measuring device according to the embodiment of the present application;

FIG. 5d is a schematic cross-sectional view of another wrist band of the blood pressure measuring device according to the embodiment of the present application;

FIG. 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 flow chart of a blood pressure measurement method according to an embodiment of the present invention;

FIG. 8a is a schematic diagram of a position of an array sensor and an artery according to an embodiment of the present invention;

fig. 8b is a schematic diagram of another position of the array sensor and the artery according to the embodiment of the invention.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

For ease of understanding, examples are given in part to illustrate concepts related to embodiments of the present application. As follows:

the blood pressure measuring device in the embodiment of the present application can be applied to the field of wearable medical equipment, daily monitoring, and the like, and as shown in fig. 1, an existing wrist band type sphygmomanometer 100 measures blood pressure by adopting an oscillometric method. Specifically, first, tie wrist strap 102 on the wrist, inflate the wrist strap, stop the pressurization after certain pressure, when blood flow circulates in the blood vessel, have certain oscillatory wave, oscillatory wave propagates pressure sensor through the trachea, pressure sensor can detect the pressure and the fluctuation in the wrist strap surveyed in real time, and the treater can be with pressure sensor's pressure signal separation into two parts: a linear compression baseline signal and a pulse oscillatory wave signal, wherein the linear compression baseline signal is a partial signal which is separated from the pressure signal and linearly changes along with time, and then a blood pressure value is calculated through the measured pulse oscillatory wave signal and the linear compression baseline signal, wherein when the amplitude of the pulse oscillatory wave is maximum, Mean Blood Pressure (MBP) corresponds to the maximum amplitude of the pulse oscillatory wave, Systolic Blood Pressure (SBP) corresponds to a first inflection point of an envelope of the pulse oscillatory wave signal, and Diastolic Blood Pressure (DBP) corresponds to a second inflection point of the envelope of the pulse oscillatory wave signal.

When a user uses the wrist-worn sphygmomanometer to perform continuous cycle measurement, the user wearing the measuring device feels obvious discomfort due to the fact that the blood vessel is compressed by inflating and pressurizing for many times, and particularly, the sleep of the user is affected by continuous measurement during night rest.

As shown in fig. 2, a conventional wristwatch type blood pressure monitor measures blood pressure by a tonometry method, which is based on a principle that a blood vessel is compressed to a flattened state by using a balloon or other device, and arterial pulsation impacts a pressure sensor covering the surface of the artery, so that the sensor is deformed to generate a pressure pulse oscillation wave signal. When the blood vessel is pressed to be in a flat state, the blood vessel is approximate to a rigid device, and the amplitude of the pulse oscillation wave signal obtained by measuring outside the arterial blood vessel and the arterial blood pressure form a linear relation. The measured peak and trough amplitude values of the pressure pulse wave need to be calibrated, namely, when the pressure pulse wave is measured, or in a short time, the real systolic and diastolic blood pressure is measured by using other standard methods for measuring blood pressure, and the peak and trough amplitude values of the pressure pulse wave are respectively and linearly mapped to the real systolic and diastolic blood pressure. When the blood pressure is measured again, the systolic pressure and the diastolic pressure can be calculated according to the predetermined calibration relation only by measuring the pressure pulse oscillation wave signals through the tensiometry. Since tensiometry can collect the pressure pulse wave of beat-to-beat, tensiometry can be used to continuously measure the blood pressure. However, in this method, it is necessary to ensure that the pressure sensor is accurately positioned right above the flattened portion of the artery to be measured during the collection process, and continuous pressurization is necessary to determine how much pressure is required to compress the artery vessel to a flattened state.

The embodiment of the invention provides a blood pressure measuring method and a blood pressure measuring device, which are used for solving the problems that when the blood pressure measuring device adopts a waveform analysis method to continuously measure blood pressure, the normal life of a user is influenced by inflating and pressurizing blood vessels for many times, and the comfort level is poor; when the tension measuring method is adopted to continuously measure the blood pressure, the pressure required by continuous pressurization is difficult to quickly obtain, so that continuous inflation in the continuous monitoring process causes discomfort to users. The method and the device provided by the application can guarantee the accuracy of measurement on the premise of not influencing normal working life. The blood pressure measuring device also has a potential application scene in the medical market, can be used for continuous blood pressure measurement, and improves the comfort level of a user.

For convenience of description, the blood pressure measuring device will be described in detail below. Fig. 3 is a schematic view of an application scenario of a blood pressure measuring device according to an embodiment of the present invention. As shown in fig. 3, the blood pressure measuring device 100 is disposed around the portion to be detected of the user, where the portion to be detected of the user is not limited (e.g., wrist, ankle).

Fig. 4 is a schematic structural diagram of a blood pressure measuring device according to an embodiment of the present invention, and as shown in fig. 4, the blood pressure measuring device 100 includes a device body 11, a wrist band 12, and a flexible array sensor 13 connected to the wrist band 12.

The device body 11 includes a housing 110, and a processor 111, a pressure sensor 112, and a micro pump 113 provided in the housing 110. The housing 110 is fixedly connected to the wrist band 12, and the device body 11 is made to surround and fit the part to be detected, such as a wrist, a finger, an ankle, etc., of the user through the wrist band 12. As shown in fig. 3, the wristband 12 is worn on the wrist of the user.

The processor 111 may be an MCU (Micro Controller Unit) or other Unit having a function of processing signals.

The pressure sensor 112 and the micro pump 113 are connected to the processor 111, and these several devices may be disposed on a printed circuit board, for example, and connected by signal traces on the printed circuit board. The micro pump 113 is used for inflation or deflation; the pressure sensor 112 is used to collect pressure wave signals during the inflation or deflation of the micro pump 113.

The wrist band 12 is used to fixedly wear the apparatus body 11 on a body part of a user, such as a wrist. The product form of the blood pressure measuring device in the embodiment of the present application may be specifically as shown in fig. 3, and the width of the wrist strap 12 is narrower than that of the existing wrist strap type sphygmomanometer, and is similar to the width of a watchband of a common watch, so as to be more convenient for a user to wear.

As shown in fig. 4, the blood pressure measuring apparatus may include a first air cell 121 and a second air cell 122 connected to the wrist band 12. Wherein, the length of the first air bag 121 is less than the circumference of the wrist strap 12, and the first air bag 121 is used for applying local pressure to the body part; when the micro pump 113 inflates air to the first air bag 121, the first air bag 121 can be tightly pressed on the artery blood vessel area of the user body part to press the artery blood vessel to a flat state, and other parts of the wrist part are not pressed by the first air bag 121 at the moment.

The second air cell 122 is stacked on the first air cell 121 and is separately disposed, and the second air cell 122 is used for applying pressure to the body part in a surrounding manner, that is, the second air cell 122 can be disposed around the body part of the user, such as the wrist, and when the micro pump inflates air to the second air cell 122, the second air cell 122 can be pressed around the wrist of the user.

Fig. 5a is a schematic structural diagram of a wrist strap of a blood pressure measuring device according to an embodiment of the present application, and as shown in fig. 5a, a first air bag 121 is disposed on the wrist strap 12, the first air bag 121 is used for applying pressure to a local part of the body, and a flexible array sensor 13 is disposed on a surface of the first air bag 121 away from the wrist strap.

Fig. 5b is a schematic cross-sectional view of a wrist band of a blood pressure measuring device according to an embodiment of the present application. As shown in fig. 5b, the flexible array sensor 13, the first air bag 121, the second air bag 122 and the wrist band 12 may be sequentially stacked on the skin surface of the user. Wherein, the positions of the first air bag 121 and the second air bag 122 can be interchanged.

Fig. 5c is a schematic cross-sectional view of another wrist band of the blood pressure measuring device according to the embodiment of the present application, and as shown in fig. 5c, the first air cell 121 is embedded in the wrist band 12, and the flexible array sensor 13 is disposed on the surface of the wrist band. More specifically, the second air cell 122 and the first air cell 121 may be stacked and embedded together in the wrist band 12, i.e. the wrist band 12 is wrapped outside the first air cell 121 and the second air cell 122.

In other embodiments, as shown in fig. 5d, the first airbag 121 may also be spliced with the second airbag 122, so as to apply pressure to the body part of the user in a surrounding manner, which is not limited herein. It will be appreciated that when the first and

second air cells

121 and 122 are inflated simultaneously, the wrist strap 12 can be pressed around the wrist of the user. When the micro-pump 113 inflates only the first balloon 121, the first balloon 121 is pressed against the arterial vessel region of the user's body part, achieving local compression, compressing the arterial vessel to a flattened state, and the second balloon 122 is not inflated, in a relaxed state.

Micro pump 113 may be used to inflate the balloon to a preset pressure value or at a preset rate; and/or for deflating the balloon to a preset pressure value or at a preset rate.

The apparatus body 11 may further include a sensor interface 114 and an air pump interface 115. The sensor interface 114 is a connection port between the pressure sensor 112 and the air bag, and the air pump interface 115 is an interface for inflating and deflating the air bag by the micro pump 113. The sensor Interface 114 may be an Inter-Integrated Circuit (I2C), but may also be in other forms, such as a Universal Asynchronous Receiver/Transmitter (UART) or a Serial Peripheral Interface (SPI), which is not limited herein.

The number of the air pump interfaces 115 can be configured according to the design conditions of the first air bag 121 and the second air bag 122, so as to ensure that each air bag can be inflated or deflated by using the air pump interfaces 115. Preferably, the device body 11 includes a first air pump interface (not shown) for inflating or deflating the first air bag and a second air pump interface (not shown) for inflating or deflating the second air bag. And are not limited herein.

The flexible array sensor 13 may be provided on the surface of the wristband 12 or on the surface of the bladder, and the flexible array sensor 13 is in contact with the skin surface of the arterial blood vessel region of the user when the blood pressure measuring device is worn on the body part of the user. 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, and may include, for example, a photoplethysmography (PPG) Sensor, an Electrocardiogram (ECG) Sensor, and a Pressure Sensor (Pressure Sensor). The flexible array sensor 13 is made of a flexible material, for example, a Polydimethylsiloxane (PDMS) flexible material is used, so that the flexible array sensor can be better attached to a human body, and a pulse oscillation wave signal acquired by the flexible array sensor 13 is more accurate, for example, a sensor based on a graphene material.

Each of the flexible array sensors 13 is provided with an identification code, e.g. Nx, y, where x denotes the position of the sensor in the transverse direction and y denotes the position of the sensor in the longitudinal direction, e.g. N_1，5It means that the sensor is located at the 1 st position in the transverse direction and the 5 th position in the longitudinal direction.

In one embodiment, the caregiver or user can manually detect the strongest pulse point on the wrist and mark it, such as with a marker pen, and then apply the flexible array sensor 13 of the measurement device to the mark. In other embodiments, the strongest pulse point on the wrist may be automatically detected by other detection devices, for example, a movable cylindrical piston (movable piston), an image acquisition, or the like. For example, the probe of the wrist pulse sensor may be contacted with the wrist of the human body to detect the frequency of the pistonic displacement motion to detect the pulse curve.

Further, the flexible array sensor 13 may be located at the center of the wristband 12 in the width direction, which may be understood as the perpendicular distance from the center point of the flexible array sensor 13 to the two long edges of the wristband 12 is similar or equal, and furthermore, the outer surface of the flexible array sensor 13 may not exceed the contact surface of 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, which is not limited herein.

In one embodiment, the flexible array sensor 13 comprises a photoplethysmographic sensor. The photoplethysmographic sensor is capable of monitoring a blood flow volume change signal of a body part of a user. The flexible array sensor 13 transmits the acquired blood flow volume change signal to the processor 111, and the processor 111 calculates the blood pressure according to the blood flow volume change signal.

In addition, the device body 11 may further include other components, such as a power module 116, a display module 117, and a wireless power module 118, for ensuring the normal operation of the device body.

The power module 116 (e.g., a battery) may be logically connected to the processor 111 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

The display module 117 includes a touch panel and a display screen. The touch panel may collect a touch operation of a user thereon (e.g., an operation of the user on or near the touch panel using a finger, a stylus, or any other suitable object or accessory), and drive a responsive connection device according to a preset program. Alternatively, the touch panel may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 111, and can receive and execute commands sent by the processor 111. In addition, the touch panel may be implemented in various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch screen, the apparatus body 11 may further include other input devices, which may include, but are not limited to, function keys (such as volume control keys, switch keys, etc.). The user can directly perform a touch input on the touch screen or perform an instruction of a selection input using a physical key.

A display screen for displaying information input by or provided to the user and various menus of the watch. Alternatively, the Display screen may be configured in the form of a Liquid Crystal Display (LCD), an organic light-Emitting Diode (OLED), or the like.

Further, the touch panel covers the display screen, and when the touch panel detects a touch operation on or near the touch panel, the touch panel transmits the touch operation to the processor 111 to determine the type of the touch event, and then the processor 111 provides a corresponding visual output on the display screen according to the type of the touch event. For example, a touch operation in the user interface (e.g., a single-click operation on an icon, a double-click operation), for example, a slide operation upward or downward in the user interface, or an operation of performing a circle-drawing gesture, or the like. In some embodiments, the touch panel may be integrated with the display screen to implement the input and output functions of the blood pressure detection device.

In 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 information such as touch coordinates and a time stamp of the touch operation). And identifying the control corresponding to the input event according to the original input event. Taking the touch operation as a touch click operation, taking a control corresponding to the click operation as a control of an icon for starting to measure the blood pressure as an example, the blood pressure measurement application program calls an interface, starts an air pump to inflate the air bag, and acquires a pressure signal through a 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 detecting device can be used with a mobile terminal having a discharge coil (i.e. having a wireless discharge function), the mobile terminal can supply power to the blood pressure detecting device 100 through a wireless power supply module 118, the power supply coil is used for inducing an alternating magnetic field generated by the discharge coil of the mobile terminal to generate an induced oscillation current, and a power supply control module is used for converting the induced oscillation current into a direct current and supplying power to the flexible array sensor 13, the micro pump 113, the pressure sensor 112 and the processor 111.

The blood pressure measuring device 100 may further include a microphone, a wireless communication module, other sensors, a memory, a timer, and the like, where the wireless communication module includes a Wireless Local Area Network (WLAN) (e.g., a wireless fidelity (Wi-Fi) network), Bluetooth (BT), a Global Navigation Satellite System (GNSS), Frequency Modulation (FM), a Near Field Communication (NFC), an infrared technology (infrared, IR), and other solutions for wireless communication, and details thereof are not repeated herein.

A microphone (not shown in fig. 4) may convert the collected sound signal into an electrical signal, which is received by the audio circuit and converted into audio data; the audio circuit can also convert the audio data into an electric signal, transmit the electric signal to a loudspeaker, and convert the electric signal into a sound signal by the loudspeaker to output.

The blood pressure measuring device 100 can interact information with other electronic devices (such as a mobile phone, a tablet computer, etc.) through the bluetooth module, and can be connected to a network through the electronic devices, a server, and the like to process functions such as voice recognition.

Other sensors may include heart rate detection sensors, gravitational 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 are not described in detail herein.

A memory (not shown in fig. 4) for storing software programs and data (e.g., exercise information), and the processor 111 executes various functional applications and data processing of the blood pressure measuring apparatus 100 by executing the software programs and data stored in the memory. The memory mainly comprises a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs (such as a sound playing function and an image playing function) required by at least one function; the stored data area may store data created from use of the watch (e.g., audio data, a phonebook, etc.). Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as a magnetic disk storage device, flash memory device, or other volatile solid state storage device.

A timer (not shown in fig. 4), the time length of which can be dynamically adjusted, for example: when the timer is started, the flexible array sensor starts to acquire pulse wave oscillation signals, and the timer can also be used for controlling the duration of the flexible array sensor acquiring the pulse wave oscillation signals.

The flow of blood pressure measurement in one embodiment of the present application is described below in conjunction with the functions of the components of the blood pressure measurement device:

firstly, find the approximate location range of the radial artery of the user, taking the wrist as an example, wrap and attach the wrist strap to the wrist part of the user, and ensure that the sensing area of the flexible array sensor is covered above the radial artery area.

Next, the processor 111 controls the micro pump 113 to make the micro pump 113 inflate the second airbag 122 through the air pump interface 115, and the first airbag 121 does not inflate, so as to ensure that the second airbag 122 exerts pressure on the wrist in a surrounding manner, preferably, in a linear manner. It will be appreciated that the entire wrist of the user is compressed by the inflation of the wristband. In one embodiment, the linear application of pressure to the wrist may be achieved by uniformly inflating the second bladder 122.

During the pressurization process, the second balloon 122 presses the blood vessel at the wrist of the user to block the blood flow in the blood vessel, and then the micro pump 113 slowly releases the air to the second balloon 122 to enable the blood in the blood vessel to flow again. In the process, the change of vibration caused by blood can reflect the change of blood pressure in the blood vessel, so the pressure sensor 112 is used to detect the pressure wave signal in the second air bag 122, the sensing element of the pressure sensor 112 is connected to the second air bag 122, the sensing element can acquire the pressure wave signal of the second air bag 122, then the sensing element can transmit the pressure wave signal to the pressure sensor 112 through the sensor interface 114, and the pressure sensor 112 transmits the pressure wave signal to the processor 111.

The processor 111 obtains the pressure wave signal a collected by the pressure sensor, measures the blood pressure value of the user by adopting an oscillometric method, and determines the local applied pressure range of the first air bag 121 according to the blood pressure value.

As shown in fig. 6, the processor 111 separates the pressure wave signal a to obtain a pulse oscillation wave signal b, and performs peak fitting on the pulse oscillation wave signal to obtain an oscillation wave envelope c; and obtaining the blood pressure value of the user by analyzing the functional relation between the oscillatory wave envelope and the blood pressure, wherein the blood pressure value comprises systolic pressure and diastolic pressure. And respectively taking the pressures of the rs and the rd on the pressure wave baseline as a systolic pressure measurement value and a diastolic pressure measurement value by positioning the positions of the derivative extreme point rs on the left side and the derivative extreme point rd on the right side of the oscillation wave envelope. Then, the blood pressure values (systolic measurement value and diastolic measurement value) are used to calculate the appropriate local compression range.

In other embodiments, the blood pressure value may be calculated by using an oscillometric method, such as a amplitude coefficient method, a combination of an inflection point method and an amplitude coefficient method to determine the blood pressure, a coefficient difference ratio method, and the like, which are not limited herein. The blood pressure is measured by the oscillometric method, so that the true and accurate systolic pressure and diastolic pressure of a user can be obtained through measurement, and the local pressurization range can be determined according to the measured systolic pressure and diastolic pressure.

Illustratively, when the user has a systolic measurement of 120mmHg and a diastolic measurement of 80 mmHg. The pressurization range is 6659-17313 pa, which is 50-130 mmHg through the conversion relation of blood pressure.

It should be noted that, the blood pressure measuring device provided by this embodiment may be used to firstly obtain a single blood pressure value that is more accurate for the user by using the oscillometric method, and then continuously measure the blood pressure by using the tension method; the blood pressure value of the user can be obtained by using other measuring devices (such as a mercury sphygmomanometer), the blood pressure value is input into the blood pressure measuring device provided by the embodiment, and then the blood pressure measuring device provided by the embodiment is used for continuous blood pressure measurement by using a tension method.

Then, the processor 111 controls the micro pump 113 through the driving circuit so that the micro pump inflates the first air bag 121 through the air pump interface 115 until the pressure in the first air bag 121 reaches the calculated pressure range to locally apply pressure to the body part of the user. At this time, the second air bag 122 is not inflated, the first air bag 121 compresses the radial artery blood vessel of the wrist of the user to a flat state, and the artery pulsation impacts the flexible array sensor covering the surface of the radial artery, so that the flexible array sensor is deformed to generate a pulse oscillation wave signal. It can be understood that the amplitude of the pulse oscillation wave signal obtained by the arterial extravascular measurement is in linear relation with the arterial blood pressure.

In the process of locally applying pressure, the processor 111 acquires a first sensor of a pulse oscillation wave signal acquired first from the flexible array sensors and a second sensor of the maximum amplitude of the pulse oscillation wave; and when the first sensor and the second sensor are not the same sensor, fusing the pulse oscillation wave signals acquired by the first sensor and the second sensor, and calculating the blood pressure value of the user according to the fused pulse oscillation wave signals.

It will be appreciated that during the local application of pressure, the processor 111 takes a tension measurement. Specifically, the processor 111 obtains the pressure wave signal collected by the pressure sensor, separates the pressure wave signal to obtain a linear pressurization baseline signal, and calculates a blood pressure value according to the fused pulse oscillation wave signal and the linear pressurization baseline signal. For example, an oscillation wave envelope curve can be fitted by extracting a pulse oscillation wave peak value sequence, an envelope curve peak value point is searched, two inflection points around the envelope curve peak value are determined, then a first time point and a second time point of the two inflection points in the pulse oscillation wave signal envelope curve are respectively obtained, and then the pressure intensities corresponding to the first time point and the second time point in the linear pressurizing baseline signal are respectively used as a systolic pressure measurement value and a diastolic pressure measurement value.

The pressure wave signal may represent a change in blood pressure in the blood vessel, and may include a baseline component and a dynamic signal component, and the processor 111 may perform band-pass filtering on the pressure wave signal to obtain a pulse oscillation wave signal, that is, a dynamic signal component in the pressure wave signal, and remove the pulse oscillation wave signal from the pressure wave signal to obtain a linear pressurization baseline signal, that is, a baseline component in the pressure wave signal. Wherein the pass band of the band pass filter may be set to 0.5-10Hz (hertz). And the corresponding measured value of the diastolic pressure time point in the baseline component of the pressure wave signal is the measured value of the diastolic pressure, and the corresponding measured value of the systolic pressure time point in the baseline component of the pressure wave signal is the measured value of the systolic pressure.

And if the first sensor and the second sensor are the same sensor, determining the blood pressure value of the user according to the pulse oscillation wave signals and the pressure wave signals acquired by the sensors.

The following is a schematic flow chart of a blood pressure measurement method provided in an embodiment of the present application. As shown in fig. 7, the method may specifically include:

and step S01, acquiring a pressure range required to be applied by the first air bag, wherein the first air bag is connected with the pressure sensor.

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

inflating and pressurizing a second air bag to apply pressure around the body part of the user, wherein the second air bag is connected with the pressure sensor; acquiring a pressure wave signal in the second air bag acquired by the pressure sensor in a surrounding type pressure application process; separating the pressure wave signals to obtain pulse oscillation wave signals, and performing wave crest fitting on the pulse oscillation wave signals to obtain oscillation wave envelopes; obtaining the blood pressure value of the user by analyzing the functional relation between the oscillatory 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.

Specifically, the processor 111 controls the micro pump 113 to make the micro pump 113 inflate the second balloon 122 through the air pump interface 115, and the second balloon 122 is used for applying pressure to the body part in a circling manner, preferably, in a linear manner. It will be appreciated that the entire wrist of the user is compressed by the inflation of the wristband. In one embodiment, the linear application of pressure to the wrist may be achieved by uniformly inflating the bladder 12.

During the pressurization process, the second balloon 122 presses the blood vessel at the wrist of the user to block the blood flow in the blood vessel, and then the micro pump 113 slowly releases the air to the second balloon 122 to enable the blood in the blood vessel to flow again. In the process, the vibration change caused by the blood can reflect the blood pressure change in the blood vessel, so the pressure sensor 112 is used for detecting the pressure wave signal in the air bag, the sensitive element of the pressure sensor 112 is connected with the air bag, the sensitive element can acquire the pressure wave signal in the air bag, then 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.

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

It should be noted that, the blood pressure measuring device provided by this embodiment may be used to firstly obtain a single blood pressure value that is more accurate for the user by using the oscillometric method, and then continuously measure the blood pressure by using the tension method; the blood pressure value may be input into the blood pressure measuring device provided in this embodiment, and then the blood pressure measuring device provided in this embodiment is used to perform continuous blood pressure measurement by a tension method, where the input blood pressure value may be a more accurate blood pressure value of the user obtained by another measuring device (e.g., a mercury sphygmomanometer).

Step S02, inflating and pressurizing the first air bag, so that the pressure in the first air bag is adjusted to the pressure range to locally pressurize the body part of the user.

Specifically, the processor controls the micro pump to inflate the first air bag 121 corresponding to the position of the flexible array sensor, so as to locally apply pressure to an arterial blood vessel to a determined pressure range, at this time, the first air bag 121 presses the radial artery blood vessel at the wrist of the user to a flat state, and the arterial pulse impacts the flexible array sensor covering the surface of the radial artery, so that the flexible array sensor deforms, and a pressure pulse oscillation wave signal is generated. It will be appreciated that the second balloon 122 is not inflated and the first balloon 121 is compressed against the arterial vessel region, rather than against the entire wrist of the user, reducing discomfort. It should be noted that the amplitude of the pulse oscillation wave signal obtained by the extra-arterial blood vessel measurement is in a linear relationship with the arterial blood pressure.

It will be appreciated that the flexible array transducer is formed from a plurality of transducers arranged in a rectangular array or an annular array on the wristband. The rectangular array is used for distributing objects in a row and column mode; circular arrays refer to equal angular distribution of objects around the center of the array.

In this embodiment, the flexible array sensor is a sensor module arranged in a rectangular array, and it can be understood that, in the heart pulse period, the blood flowing through the arterioles, capillaries and venules in the peripheral blood vessels correspondingly pulsates. The volume of blood is greatest when the heart contracts and smallest when the heart relaxes. Such pulsatile changes in blood volume are typically obtained by a photoelectric volume sensor, and the resulting waveform contains volumetric pulse flow information. The systolic and diastolic blood pressure can thus be obtained from the relationship of the volumetric pulse flow information and the blood pressure signal, which is known as photoplethysmography (PPG).

The light intensity detected by the photoelectric receiver will be weakened due to absorption attenuation of finger tip skin muscle tissue and blood. Wherein the absorption of light by skin, muscle and tissue is constant throughout the blood circulation, while the volume of blood in the skin pulsates under the action of systolic relaxation. When the heart contracts, the blood volume of the peripheral blood vessel is the maximum, the light absorption amount is also the maximum, and the detected light intensity is the minimum; when the heart is in diastole, on the contrary, the blood volume of the peripheral blood vessel is the minimum, the detected light intensity is the maximum, and the light intensity detected by the photoelectric receiver is in pulsatile change. Then the light intensity variation signal is converted into an electric signal, and the electric signal is amplified to obtain the variation of volume pulse blood flow.

Step S03, in the process of local pressure application, a first sensor which collects pulse oscillation wave signals in the flexible array sensors is obtained, and a second sensor which collects pulse oscillation wave signals with the maximum amplitude is obtained; wherein the flexible array sensor is in contact with a skin surface of an arterial vessel region of a user.

Specifically, in the acquisition process, the sensor which records that the pulse oscillation wave signal is acquired first is the first sensor, and the sensor which records that the pulse oscillation wave signal with the maximum amplitude is acquired 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 wrist part of the user and is pressed on the skin surface of the user in a preset pressure range. The preset pressure range can press the radial artery blood vessel of the wrist of the user to a flat state, and the artery pulsation impacts the flexible array sensor covering the surface of the radial artery, so that the flexible array sensor deforms to generate a pressure pulse oscillation wave signal.

Step S04, when the first sensor and the second sensor are not the same sensor, fusing the pulse oscillation wave signals acquired by the first sensor and the second sensor.

Specifically, when the identification codes of the first sensor and the second sensor are consistent, the first sensor and the second sensor are confirmed to be the same sensor.

For example, the identification codes of the first sensor and the second sensor are both N_1,5Then the same sensor is used, which means that only one sensor in the flexible array sensor is positive above the artery, as shown in fig. 8a, when the positive pressure of sensor number B is directly above the radial artery.

When the identification codes of the first and second sensors are not identical, for example, the identification code of the first sensor is N_1,5The identification code of the second sensor is N_2,5Then the first sensor is not the same sensor as the second sensor. As shown in fig. 8B, two adjacent sensors (sensor B and sensor C) in the flexible array sensor are pressed above the artery in parallel, and two pulse oscillation 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 proportion, and the blood pressure value of the user is calculated according to the fused pulse oscillatory wave signals. For example, the pulse oscillation wave signal collected by the first sensor is the first signal (S1), the pulse oscillation 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 m2, so that the fused pulse oscillation wave signal Scombine is m1S1+ m2S2

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

And 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, obtaining a fused pulse oscillatory wave signal, performing peak fitting on the fused pulse oscillatory wave signal to obtain an oscillatory wave envelope, searching an envelope peak point, determining two inflection points around the envelope peak, and then respectively obtaining a first time point and a second time point corresponding to the two inflection points in the pulse oscillatory wave signal envelope; and acquiring pressure wave signals acquired by the pressure sensor in the process of locally applying pressure, separating the pressure wave signals to obtain linear pressurization baseline signals, and respectively taking the pressures corresponding to the first time point and the second time point in the linear pressurization baseline signals as a systolic pressure measurement value and a diastolic pressure measurement value.

The embodiment of the present application further provides a blood pressure measuring device, and the device includes:

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

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

the second acquisition unit is used for acquiring a first sensor which acquires the pulse oscillation wave signal in the flexible array sensor and a second sensor which acquires the pulse oscillation wave signal with the maximum amplitude in the process of locally applying pressure; wherein the flexible array sensor is in contact with a skin surface of an arterial vessel region of a user;

the fusion unit is used for 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;

and the first calculating unit is used for calculating the blood pressure value of the user according to the fused pulse oscillation wave signal and the pressure wave signal acquired by the pressure sensor.

Further, the device comprises a measuring unit for inflating and pressurizing a second air bag to apply pressure around the body part of the user, wherein the second air bag is connected with the pressure sensor; acquiring a pressure wave signal in the second air bag acquired by the pressure sensor in a surrounding type pressure application process; separating the pressure wave signal to obtain a linear pressurization baseline signal and a pulse oscillation wave signal, and performing peak fitting on the pulse oscillation wave signal to obtain an oscillation wave envelope; obtaining the blood pressure value of the user by analyzing the functional relation between the oscillatory 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.

Specifically, the device further comprises a receiving unit and a conversion unit, wherein the receiving unit is used for receiving the input blood pressure value of the user to be measured; and the conversion unit is used for obtaining the pressurization range according to the preset blood pressure conversion relation. For example, the blood pressure value of the user is input into the blood pressure measuring device, wherein the blood pressure value is 120mmHg and 80 mmHg; according to the preset blood pressure conversion relationship, the pressurization range is 6659-17313 pa, which is 50-130 mmHg.

In the local pressurization process, the air bag presses the radial artery blood vessel at the wrist of the user to be in a flat state, and the artery pulsation impacts the flexible array sensor covered on the surface of the radial artery, so that the flexible array sensor generates deformation and generates a pressure pulse oscillation wave signal. It will be appreciated that the local balloon compresses the arterial blood vessel, rather than the entire wrist of the user, reducing discomfort.

The device also comprises a judging unit which is used for confirming 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.

When the identification codes of the first and second sensors are not identical, for example, the identification code of the first sensor is N_1,5The identification code of the second sensor is N_2,5Then the first sensor is not the same sensor as the second sensor. As shown in FIG. 8bIt shows that two adjacent sensors (sensor B and sensor C) in the flexible array sensor are pressed above the artery in parallel, and two paths of pulse oscillation wave signals need to be extracted for fusion calculation.

The fusion unit further comprises a first fusion subunit and a second fusion subunit.

And the first fusion subunit is used for fusing the pulse oscillation wave signals acquired by the first sensor and the second sensor according to a preset weight proportion and calculating the blood pressure value of the user according to the fused signals. For example, the pulse oscillation wave signal collected by the first sensor is the first signal (S1), the pulse oscillation 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 m2, so that the fused pulse oscillation wave signal Scombine is m1S1+ m2S2

And the first fusion subunit is used for fusing the pulse oscillation wave signals acquired by the first sensor and the second sensor according to an addition and average method, and calculating the blood pressure value of the user according to the fused signals. For example, the pulse oscillation wave signal collected by the first sensor is the first path signal (S1), the pulse oscillation wave signal collected by the second sensor is the second path signal (S2), and the fused pulse oscillation wave signal Scombine is (S1+ S2)/2.

And acquiring the fused pulse oscillation wave signal, and performing wave crest fitting on the fused pulse oscillation wave signal to obtain oscillation wave envelope. And respectively taking the corresponding pressure of rs and rd on the pressure wave baseline as a systolic pressure measurement value and a diastolic pressure measurement value by positioning the positions of the derivative extreme point rs on the left side and the derivative extreme point rd on the right side of the oscillation wave envelope peak.

The first calculating unit is further used for obtaining the fused pulse oscillation wave signal, performing peak fitting on the fused pulse oscillation wave signal to obtain an oscillation wave envelope curve, searching an envelope curve peak point, determining two inflection points around the envelope curve peak value, and then respectively obtaining a first time point and a second time point corresponding to the two inflection points in the pulse oscillation wave signal envelope curve; and acquiring pressure wave signals acquired by the pressure sensor in the process of locally applying pressure, separating the pressure wave signals to obtain linear pressurization baseline signals, and respectively taking the pressures corresponding to the first time point and the second time point in the linear pressurization baseline signals as a systolic pressure measurement value and a diastolic pressure measurement value.

And the second calculating unit is used for calculating the blood pressure value of the user according to the pulse oscillation wave signal acquired by the first sensor and the pressure wave signal when the first sensor and the second sensor are the same sensor.

The invention can be applied to wearable or household products for continuously monitoring the blood pressure of a user, can also be used in professional medical scenes, can be used as auxiliary equipment of an oscillometric dynamic sphygmomanometer, reduces the times of inflating and pressurizing the dynamic sphygmomanometer, and improves the comfort level of the user during continuous blood pressure measurement. The embodiment provided by the invention fully utilizes the advantages of the oscillometric method and the tensiometry method, and fuses two different paths of signals pressed on the blood vessel in the measurement process, thereby improving the accuracy of blood pressure data.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The above description is only for the specific embodiments of the present application, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A 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 fixing the device body on the body part of a user to be monitored in a surrounding manner;

the flexible array sensor is in contact with a skin surface of the user's arterial vessel region, 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 pressure sensor is used for acquiring a pressure wave signal in the first air bag in the inflating process of the micro pump;

the processor is used for acquiring a pressure range required to be applied by the first air bag; controlling the micro pump to inflate the first balloon so that the pressure in 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 from the flexible array sensor;

the processor acquires a second sensor which acquires 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 collected by the first sensor and the second sensor;

and calculating the blood pressure value of the user according to the fused pulse oscillation wave signal and the pressure wave signal.

2. The blood pressure measuring device according to claim 1, further comprising a second air bag attached to the cuff band, the second air bag being stacked on and separately provided from the first air bag, the second air bag being for applying pressure around the body part;

the processor is also used for controlling the micro pump to inflate the second air bag;

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

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

3. A blood pressure measuring device as recited in claim 1, wherein the first bladder is embedded within the cuff, the flexible array sensor being disposed on a surface of the cuff; or the first air bag is arranged on the surface of the wrist strap, and the flexible array sensor is arranged on the surface of the first air bag far away from the wrist strap.

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

5. The blood pressure measuring 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. A blood pressure measuring device according to any one of claims 1 to 5, wherein 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.

7. A blood pressure measuring device according to any one of claims 1 to 5, wherein the processor is further configured to fuse the pulse oscillatory wave signals collected by the first sensor and the second sensor according to an addition and averaging method.

8. The device of claim 1, wherein the processor is further configured to obtain a pressure wave signal collected by the pressure sensor during the local application of pressure, separate a linear compression baseline signal from the pressure wave signal, and calculate a blood pressure value according to the fused pulsar signal and the linear compression baseline signal.

9. The blood pressure measuring device of claim 1, wherein 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.

10. A blood pressure measuring device according to claim 1, wherein the flexible array sensor is a rectangular array sensor comprising a photoplethysmographic sensor.

11. A method of measuring blood pressure, the method comprising:

inflating and pressurizing the first bladder such that a pressure within the first bladder adjusts to the pressure range to apply localized pressure to the body part of the user;

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

12. The method of measuring blood pressure according to claim 11, wherein said obtaining a range of pressure to be applied by a first bladder of a blood pressure measuring device comprises:

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

acquiring a pressure wave signal in the second air bag acquired by the pressure sensor in a surrounding type pressure application process;

13. The method of measuring blood pressure according to claim 11, wherein said obtaining a range of pressure to be applied by a first bladder of a blood pressure measuring device comprises:

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

14. The method for measuring blood pressure according to claim 11, wherein before the fusing the 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, the method further comprises:

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.

15. The method for measuring blood pressure according to any one of claims 11 to 14, wherein the fusing the pulse oscillation wave signals collected by the first sensor and the second sensor when the first sensor and the second sensor are not the same sensor includes:

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

16. The method for measuring blood pressure according to any one of claims 11 to 14, wherein the fusing the pulse oscillation wave signals collected by the first sensor and the second sensor when the first sensor and the second sensor are not the same sensor includes:

17. The method of measuring blood pressure according to claim 11, wherein the processor calculates the blood pressure value of the user from the fused pulse oscillation wave signal and the pressure wave signal collected by the pressure sensor, and comprises:

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

18. The method for measuring blood pressure according to claim 11, further comprising:

and 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.