Blood pressure measurement method using wearable device and wearable device

Abstract

The present application provides a blood pressure measurement method for a wearable device and a wearable device, which can improve the measurement accuracy of blood pressure values. The wearable device provided by the present application includes a pressure sensor PT, a display screen, and a photodiode PD; the method provided by the present application includes: emitting a light signal through a first area of ​​the display screen; converting the light signal received by the PD into a first PPG signal; if the first PPG signal does not meet the signal quality requirements, emitting a light signal through a second area of ​​the display screen, and the second area and the first area are different in at least one of the following features: position on the display screen, luminous brightness, area size or shape; converting the light signal received by the PD into a second PPG signal; when the second PPG signal meets the signal quality requirements, obtaining the pressure value collected by the PT; determining the wearer's blood pressure value based on the pressure value and the second PPG signal.

Description

Technical Field

[0001] The present application relates to the field of terminal technology, and in particular to a blood pressure measurement method for a wearable device and a wearable device. Background Art

[0002] With the development of wearable devices, more and more functions are supported by wearable devices. In order to meet the needs of users for their own health management, many wearable devices can support the user's human body data monitoring function. For example, smart watches can measure human characteristics such as heart rate, respiratory rate, blood pressure or blood oxygen.

[0003] At present, for the measurement of blood pressure, there is a method on the market to obtain blood pressure values ​​based on the photoplethysmography (PPG) signal and fingertip pressure of the fingertips. The user applies pressure to the wearable device through the fingertips, and the wearable device obtains the pressure of the fingertips through the pressure transducers (PT), and emits a light signal through the light emitting diode (LED) in the PPG module. The light signal is absorbed and scattered by the skin tissue of the fingertips to form a reflection signal, which can be received by the photodiode (PD) in the PPG module and converted into a PPG signal. The wearable device can obtain the blood pressure value based on the waveform of the PPG signal of the fingertips.

[0004] However, this method has the problem that the blood pressure value measured is inaccurate. Summary of the invention

[0005] The present application provides a blood pressure measurement method for a wearable device and a wearable device, which can improve the accuracy of blood pressure values.

[0006] In a first aspect, a blood pressure measurement method for a wearable device is provided, including: the wearable device includes a pressure sensor PT, a display screen, and a photodiode PD; the method includes: emitting a light signal through a first area of ​​the display screen; converting the light signal received by the PD into a first PPG signal; if the first PPG signal does not meet the signal quality requirement, emitting a light signal through a second area of ​​the display screen, the second area and the first area are different in at least one of the following features: position on the display screen, luminous brightness, area size or shape; converting the light signal received by the PD into a second PPG signal; when the second PPG signal meets the signal quality requirement, obtaining a pressure value collected by the PT; and determining the wearer's blood pressure value based on the pressure value and the second PPG signal.

[0007] The display screen may also be referred to as a display screen or a screen, which is not limited in this application. The first area of ​​the display screen is also the luminous area or the screen luminous area in the embodiment. It can be understood that the first area is smaller than or equal to the area of ​​the display screen.

[0008] When the wearer touches or presses the first area with a finger, the light signal emitted by the first area can be absorbed and scattered by the finger skin tissue to form a reflection signal, and the PD can convert the reflection signal into a first PPG signal. The first PPG signal is also the initial PPG signal in the embodiment.

[0009] If the first PPG signal does not meet the signal quality requirements, the wearable device can obtain the second area by adjusting at least one of the position of the first area on the display screen, the luminous brightness of the display screen in the first area, the area size of the first area, or the shape of the first area, and use the second area to emit a light signal to obtain a PPG signal that meets the signal quality requirements.

[0010] If the second PPG signal meets the signal quality requirement, the wearable device can collect one or more second PPG signals, which is not limited in this application.

[0011] The pressure value is collected at the same time as the second PPG signal. When the number of the second PPG signal is one, the number of the pressure value is also one. When the number of the second PPG signal is multiple, the number of the pressure value is also multiple.

[0012] Wearable devices can determine the wearer's blood pressure based on the collected PPG signals and pressure values.

[0013] The blood pressure measurement method of the wearable device provided in the present application obtains the second area to obtain the second PPG signal that meets the signal quality requirements by adjusting at least one of the position of the first area on the display screen, the luminous brightness of the display screen in the first area, the size of the first area, or the shape of the first area. The PPG signals used to measure the blood pressure values ​​are all signals that meet the signal quality requirements, which is conducive to improving the measurement accuracy of the blood pressure values. In addition, the present application uses the first area of ​​the display screen as a measurement light source, and does not need to deploy a separate measurement light source, which is conducive to saving space for wearable devices and is conducive to application promotion.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the first PPG signal does not meet the signal quality requirements, including: the perfusion rate of the first PPG signal is less than or equal to a preset perfusion rate; the distance between the projection area of ​​the PD on the display screen and the second area is greater than the distance between the projection area of ​​the PD on the display screen and the first area.

[0015] There is a first distance between the projection area of ​​the PD on the display screen and the first area. In other words, there is a certain spacing distance between the first area and the PD in the horizontal direction, which is not limited in the present application.

[0016] If the first PPG signal does not meet the signal quality requirement because the perfusion rate of the first PPG signal is low, the wearable device can increase the horizontal spacing distance between the first area and the PD. The position of the PD can be fixed, and the wearable device can change the position of the first area on the display screen to obtain the second area.

[0017] The blood pressure measurement method of the wearable device provided in the present application increases the perfusion rate of the PPG signal by increasing the distance between the projection area of ​​the PD on the display screen and the first area, which is beneficial to obtaining a PPG signal that meets the signal quality requirements and is beneficial to improving the measurement accuracy of the blood pressure value.

[0018] In combination with the first aspect, in some implementations of the first aspect, the first PPG signal does not meet the signal quality requirement, including: the intensity of the first PPG signal is less than or equal to the preset intensity; the luminous brightness of the second area is greater than the luminous brightness of the first area.

[0019] If the first PPG signal does not meet the signal quality requirement because the first PPG signal is too weak, that is, the intensity of the first PPG signal is less than or equal to the preset intensity, the wearable device may increase the light emission of the second area of ​​the display screen. The second area is located at the same position as the first area, but the light emission brightness is greater than the first area. In a possible implementation, the wearable device may increase the light emission brightness of the display screen according to a preset increment.

[0020] The blood pressure measurement method of the wearable device provided in the present application increases the luminous brightness of the display screen in the first area and increases the strength of the PPG signal, which is beneficial for obtaining a PPG signal that meets the signal quality requirements and is beneficial for improving the measurement accuracy of the blood pressure value.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: if the second PPG signal does not meet the signal quality requirement, emitting a light signal through a third area of ​​the display screen, and the distance between the projection area of ​​the PD on the display screen and the third area is smaller than the distance between the projection area of ​​the PD on the display screen and the first area; converting the light signal received by the PD into a third PPG signal; if the third PPG signal meets the signal quality requirement, obtaining a pressure value collected by the PT; and determining the wearer's blood pressure value based on the pressure value and the third PPG signal.

[0022] If the second PPG signal cannot meet the signal quality requirements through brightness adjustment, that is, when the luminous brightness of the second area is the maximum value, the intensity of the second PPG signal is still less than or equal to the preset intensity, the wearable device can reduce the horizontal spacing distance between the first area and the PD. The position of the PD can be fixed, and the wearable device can change the position of the first area on the display screen to obtain a third area, and the distance between the projection area of ​​the PD on the display screen and the third area is less than the distance between the projection area of ​​the PD on the display screen and the first area.

[0023] The blood pressure measurement method of the wearable device provided in the present application increases the intensity of the PPG signal by reducing the optical path when the luminous brightness of the first area reaches the maximum value, which is beneficial to obtaining a PPG signal that meets the signal quality requirements and is beneficial to improving the measurement accuracy of the blood pressure value.

[0024] In combination with the first aspect, in some implementations of the first aspect, a shape of the second area is different from a shape of the first area.

[0025] The shape of the first area belongs to a shape set, which includes a circle, an ellipse, a bar, a square, a triangle, or an arc; the wearable device can change the shape of the first area to any shape in the shape set except the shape of the first area to obtain a second area.

[0026] In combination with the first aspect, in some implementations of the first aspect, the area size of the second region is different from the area size of the first region.

[0027] The wearable device can change the area size of the first area according to a preset scaling standard to obtain the area size of the second area.

[0028] The preset zoom standard may include a reduction standard or an enlargement standard.

[0029] If the PPG signal does not meet the signal quality requirement, the wearable device can continuously change the size of the first area according to a preset scaling standard until a PPG signal that meets the signal quality requirement is obtained.

[0030] The blood pressure measurement method of the wearable device provided in the present application changes the area size of the first area and reduces or increases the light-emitting area to obtain a PPG signal that meets the signal quality requirements, which is beneficial to improving the measurement accuracy of the blood pressure value.

[0031] In combination with the first aspect, in certain implementations of the first aspect, the pressure value includes multiple pressure values, the second PPG signal includes multiple second PPG signals, the multiple pressure values ​​correspond to the multiple second PPG signals one-to-one, and each of the multiple pressure values ​​and the corresponding second PPG signal are collected at the same time; determining the wearer's blood pressure value according to the pressure value and the second PPG signal includes: extracting a waveform feature of each second PPG signal in the multiple second PPG signals; if there is a target second PPG signal in the multiple second PPG signals whose waveform feature is less than or equal to a preset waveform feature, determining the pressure value corresponding to the target second PPG signal as the systolic blood pressure (SBP) in the wearer's blood pressure value.

[0032] When there are different pressure values ​​between the wearable device and the contact part, the wearable device can collect multiple pressure values ​​through PT. These multiple pressure values ​​can be generated by the wearer through pressing, but the present application is not limited to this. Among them, the wearer can also be called a user, which is not limited in the present application.

[0033] When the wearable device collects each of the multiple pressure values, it can collect the second PPG signal at each pressure value to obtain multiple second PPG signals. That is, the multiple pressure values ​​and the multiple second PPG signals correspond one to one, and the collection time of each pressure value in the multiple pressure values ​​and the corresponding second PPG signal is the same.

[0034] The wearable device can extract the waveform features of multiple second PPG signals respectively through the feature extraction model, and can compare the waveform features of the multiple second PPG signals with the preset waveform features. If there is a target second PPG signal whose waveform feature is less than or equal to the preset waveform feature, the pressure value corresponding to the target second PPG signal is determined as SBP. Among them, the preset waveform feature is used to indicate that there is no obvious waveform feature, that is, the R&D personnel can determine the preset waveform feature based on the waveform features of a large number of PPG signals without obvious waveform features. It can be understood that the target second PPG signal whose waveform feature is less than or equal to the preset waveform feature has no obvious waveform feature.

[0035] If the target second PPG signal has no obvious waveform characteristics, it can be said that the pressure value is relatively large at this time. The pressure between the wearable device and the contact part can squeeze the blood vessels in the contact part to form occlusion, and the systolic blood pressure can be accurately measured at this time.

[0036] In the blood pressure measurement method for a wearable device provided in the present application, the pressure value corresponding to the target second PPG signal whose waveform characteristics are less than or equal to the preset waveform characteristics is determined as SBP, and the systolic blood pressure can be directly obtained through PT, which is simple, efficient and highly accurate.

[0037] In combination with the first aspect, in certain implementations of the first aspect, the pressure value includes multiple pressure values, the second PPG signal includes multiple second PPG signals, the multiple pressure values ​​and the multiple second PPG signals correspond one to one, and the collection time of each pressure value in the multiple pressure values ​​and the corresponding second PPG signal is the same; determining the wearer's blood pressure value according to the pressure value and the second PPG signal includes: extracting the waveform features of each second PGG signal in the multiple second PPG signals; inputting the waveform features of the multiple pressure values ​​and the multiple second PPG signals into a neural network model, the neural network model is trained based on the waveform features of historical pressure values ​​and historical PPG signals, and is used for blood pressure measurement; determining the output of the neural network model as the diastolic pressure DBP in the wearer's blood pressure value.

[0038] Researchers can train a neural network model based on the waveform characteristics of historical pressure values ​​and historical PPG signals to determine the DBP in the blood pressure value.

[0039] The wearable device can use the waveform features of multiple pressure values ​​and multiple PPG signals as inputs to the neural network model, and determine the output of the neural network model as DBP.

[0040] Optionally, the wearable device can use the pressure value corresponding to the target second PPG signal (that is, the PPG signal without obvious waveform characteristics) among multiple pressure values ​​and the PPG signal corresponding to the pressure value as the input of the neural network model, and determine the output of the neural network model as DBP.

[0041] The blood pressure measurement method for a wearable device provided in the present application calculates the diastolic pressure through the pressure value and the waveform characteristics presented by the second PPG signal, which improves the accuracy of the blood pressure value compared to the blood pressure value calculated by regression or other calculation methods.

[0042] In combination with the first aspect, in certain implementations of the first aspect, before obtaining the pressure value collected by PT, the method also includes: outputting operation instructions, the operation instructions are used to guide the wearer to apply pressure perpendicular to the contact surface between the wearable device and human skin to the wearable device in a preset pressing area, and the operation instructions include the pressure value required by the wearer to press.

[0043] The pressure value between the wearable device and the contact part can be generated by the wearer pressing according to the operating instructions. The wearable device can guide the user to continuously apply pressure to the wearable device through text, sound, image or color, that is, the operating instructions can be text, sound, image or color, and this application is not limited to this. In one possible implementation, the operating instructions may be "Please increase the pressing pressure". The wearable device can guide the user through sound and / or text. In another possible implementation, the wearable device displays the pressure curve through the human-computer interaction interface to guide the user to continuously apply pressure to the wearable device according to the pressure curve.

[0044] The wearable device can guide the user to apply continuous pressure to the wearable device for a period of time according to the operating instructions. The pressure of the continuous pressure is perpendicular to the contact surface between the wearable device and the human skin (the contact part or the measured part), so that a continuous pressure change is continuously generated between the wearable device and the human skin. Among them, the embodiment of the present application does not limit the duration of continuous pressure. In one possible implementation, the duration of continuous pressure can be 30 seconds.

[0045] It should be noted that the continuous pressure application process is a process of increasing pressure. In the embodiment of the present application, the blood vessels in the skin in contact with the wearable device are squeezed and occluded by the user's continuous pressure application to measure blood pressure.

[0046] The blood pressure measurement method of the wearable device provided in the present application can standardize the wearer's pressure-applying behavior by guiding the wearer to apply pressure through operation instructions. The pressure applied is controllable and is the expected pressure value, which is conducive to the subsequent measurement of blood pressure values.

[0047] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: during the wearer's pressure application process, if the following conditions are met, the blood pressure measurement is terminated: the acceleration of the wearable device is greater than the acceleration threshold; and / or the angular velocity of the wearable device is greater than the angular velocity threshold.

[0048] During the process of the wearer applying pressure, that is, the wearer applying pressure based on the operating instructions, the wearable device can detect the stability of the pressure process. If the stability does not meet the data collection requirements, the blood pressure measurement is terminated.

[0049] If the acceleration of the wearable device is greater than the acceleration threshold, it can be said that the wearable device is in a shaking state, which does not meet the requirements, and the blood pressure measurement is terminated. If the angular velocity of the wearable device is greater than the angular velocity threshold, it can be said that the wearable device is in a skewed and warped state, which does not meet the requirements, and the blood pressure measurement is terminated. If the acceleration of the wearable device is greater than the acceleration threshold, and the angular velocity of the wearable device is greater than the angular velocity threshold, it can be said that the wearable device is in a shaking and skewed and warped state, which does not meet the requirements, and the blood pressure measurement is terminated. Among them, the acceleration of the wearable device can be obtained by an acceleration sensor, and the angular velocity of the wearable device can be obtained by a gyroscope, but the present application is not limited to this.

[0050] The blood pressure measurement method of a wearable device provided in the present application detects the state of the wearable device during the process of the wearer applying pressure, and ends the blood pressure measurement when the state of the wearable device is unstable. This is conducive to performing blood pressure measurement under stable conditions and ensuring the accuracy of blood pressure measurement.

[0051] In combination with the first aspect, in certain implementations of the first aspect, the method also includes: displaying a first interface, the first interface displaying a pressure curve, prompt information, and a waveform of a second PPG signal, the pressure curve being an operation guide, and the prompt information being used to prompt the wearer of a pressing duration.

[0052] The first interface may also be referred to as an interface, which is not limited in the present application. The pressure curve is an operation guide. The wearer can apply pressure to the wearable device according to the pressure curve. The wearable device can prompt the user to press for a certain period of time through prompt information to guide the user to continue pressing for a certain period of time. The waveform of the second PPG signal may be the waveform of the second PPG signal collected by the wearable device. In a possible implementation, the first interface may be Fig.15 In the b interface.

[0053] The blood pressure measurement method of the wearable device provided in the present application displays the pressure curve, prompt information and the waveform of the PPG signal through the first interface, which is conducive to the user to correctly apply pressure to the wearable device according to the operating instructions, can improve the user experience, and is also conducive to ensuring the correct measurement of blood pressure values.

[0054] In combination with the first aspect, in certain implementations of the first aspect, before emitting a light signal through the first area of ​​the display screen, the method also includes: determining whether the wearable device meets blood pressure measurement conditions; emitting a light signal through the first area of ​​the display screen, including: emitting a light signal through the first area of ​​the display screen when the blood pressure measurement conditions are met.

[0055] The blood pressure measurement condition may be a measurement condition in an embodiment, and when the blood pressure measurement condition is met, the wearer's blood pressure is measured. It is understandable that if the wearable device meets the blood pressure measurement condition, it can be explained that the state at this time can effectively measure the blood pressure, and the accuracy of the blood pressure value is high. If the wearable device does not meet the blood pressure measurement condition, it can be explained that the state at this time cannot effectively measure the blood pressure, and the accuracy of the blood pressure value is low.

[0056] The blood pressure measurement condition may include at least one of the following: the wearable device is in a relatively static state, the wearable device is in good contact with the skin, and the quality of the PPG signal is good.

[0057] The measurement condition may include at least one of the following: the wearable device is in a relatively static state, the wearable device is in good contact with the skin, and the wearable device is not tilted or tilted.

[0058] The wearable device can obtain the acceleration of the wearable device through an accelerometer (Acc) to determine whether the wearable device is in a relatively static state. The wearable device can obtain a pressure value through PT to determine whether the wearable device is in good contact with the skin. The wearable device can obtain angular velocity data through a gyroscope to determine whether the wearable device is tilted or tilted, but the embodiments of the present application are not limited thereto.

[0059] The blood pressure measurement method for a wearable device provided in the present application determines whether blood pressure measurement conditions are met before measuring blood pressure, and performs measurement on the basis that the blood pressure measurement conditions are met, which is conducive to improving the accuracy of blood pressure values.

[0060] In combination with the first aspect, in certain implementations of the first aspect, the measurement conditions include at least one of the following: the acceleration of the wearable device is less than or equal to the acceleration threshold, the pressure value is greater than or equal to the pressure threshold, or the angular velocity of the wearable device is less than or equal to the angular velocity threshold; wherein the acceleration is used to indicate the contact between the wearable device and the wearer, and the pressure value is used to indicate the tightness of the wearable device.

[0061] The pressure value is obtained before the wearable device controls the first area of ​​the display screen to emit light.

[0062] In combination with the first aspect, in certain implementations of the first aspect, the display screen is supported by a screen bracket, the screen bracket includes an optical window, and the optical window includes a PD directly below the optical window. There is a preset distance between the PD and the optical window. The PT is located at the bottom of the wearable device and is used to collect the pressure value between the wearable device and the wearing part, and the wearing part is the contact part between the wearable device and the wearer.

[0063] The structure of the wearable device can be as shown in the embodiment Figure 8As shown, the screen bracket is used to support the display screen, and the display screen includes an optical window so that the PD can receive the light signal. There is a certain distance between the PD and the optical window, which can be called a preset distance, but the present application is not limited to this. The PT is located at the bottom of the wearable device and can be integrated in the sensor circuit board. The PT is used to collect the pressure value between the wearable device and the wearing part, that is, pressing the wearable device with a finger can form a reaction force between the wearable device and the wearing part. The wearable device can calculate the finger pressure based on the relationship between the reaction force and the action force (which can be the finger pressure). The wearable device can obtain the blood pressure value based on the finger pressure and the PPG signal of the finger.

[0064] In the blood pressure measurement method for wearable devices provided in the present application, PT and PD are deployed separately, and are not integrated into a module. They can be deployed in a scattered manner on wearable devices, which is more flexible and can also save space.

[0065] In the second aspect, a wearable device is provided, which includes a pressure sensor PT, a display screen, and a photodiode PD; the wearable device also includes a processing module and an acquisition module. The processing module is used to: emit a light signal through the first area of ​​the display screen; convert the light signal received by the PD into a first PPG signal; if the first PPG signal does not meet the signal quality requirements, emit a light signal through the second area of ​​the display screen, and the second area and the first area have at least one of the following characteristics that are different: position on the display screen, luminous brightness, area size or shape; convert the light signal received by the PD into a second PPG signal; the acquisition module is used to: when the second PPG signal meets the signal quality requirements, obtain the pressure value collected by the PT; the processing module is also used to: determine the wearer's blood pressure value based on the pressure value and the second PPG signal.

[0066] In combination with the second aspect, in certain implementations of the second aspect, the first PPG signal does not meet the signal quality requirements, including: the perfusion rate of the first PPG signal is less than or equal to the preset perfusion rate; the distance between the projection area of ​​the PD on the display screen and the second area is greater than the distance between the projection area of ​​the PD on the display screen and the first area.

[0067] In combination with the second aspect, in some implementations of the second aspect, the first PPG signal does not meet the signal quality requirement, including: the intensity of the first PPG signal is less than or equal to the preset intensity; the luminous brightness of the second area is greater than the luminous brightness of the first area.

[0068] In combination with the second aspect, in certain implementations of the second aspect, the processing module is further used to: if the second PPG signal does not meet the signal quality requirements, emit a light signal through the third area of ​​the display screen, and the distance between the projection area of ​​the PD on the display screen and the third area is smaller than the distance between the projection area of ​​the PD on the display screen and the first area; convert the light signal received by the PD into a third PPG signal; the acquisition module is further used to: if the third PPG signal meets the signal quality requirements, acquire the pressure value collected by the PT; the processing module is further used to: determine the wearer's blood pressure value based on the pressure value and the third PPG signal.

[0069] In combination with the second aspect, in some implementations of the second aspect, a shape of the second area is different from a shape of the first area.

[0070] In combination with the second aspect, in some implementations of the second aspect, the area size of the second region is different from the area size of the first region.

[0071] In combination with the second aspect, in certain implementations of the second aspect, the pressure value includes multiple pressure values, the second PPG signal includes multiple second PPG signals, the multiple pressure values ​​correspond to the multiple second PPG signals one-to-one, and the collection time of each pressure value in the multiple pressure values ​​and the corresponding second PPG signal is the same; the above-mentioned processing module is also used to: extract the waveform characteristics of each second PPG signal in the multiple second PPG signals; if there is a target second PPG signal in the multiple second PPG signals whose waveform characteristics are less than or equal to the preset waveform characteristics, the pressure value corresponding to the target second PPG signal is determined as the systolic pressure SBP in the wearer's blood pressure value.

[0072] In combination with the second aspect, in certain implementations of the second aspect, the pressure value includes multiple pressure values, the second PPG signal includes multiple second PPG signals, the multiple pressure values ​​and the multiple second PPG signals correspond one to one, and the collection time of each pressure value in the multiple pressure values ​​and the corresponding second PPG signal is the same; the above-mentioned processing module is also used to: extract the waveform characteristics of each second PGG signal in the multiple second PPG signals; input the waveform characteristics of the multiple pressure values ​​and the multiple second PPG signals into the neural network model, the neural network model is trained based on the waveform characteristics of historical pressure values ​​and historical PPG signals, and is used for blood pressure measurement; and determine the output of the neural network model as the diastolic pressure DBP in the wearer's blood pressure value.

[0073] In combination with the second aspect, in certain implementations of the second aspect, the above-mentioned processing module is also used to: output operation instructions, the operation instructions are used to guide the wearer to apply pressure perpendicular to the contact surface between the wearable device and human skin to the wearable device in a preset pressing area, and the operation instructions include the pressure value required by the wearer to press.

[0074] In combination with the second aspect, in certain implementations of the second aspect, the above-mentioned processing module is also used to: during the wearer's pressure application process, if the following conditions are met, the blood pressure measurement is terminated: the acceleration of the wearable device is greater than the acceleration threshold; and / or the angular velocity of the wearable device is greater than the angular velocity threshold.

[0075] In combination with the second aspect, in certain implementations of the second aspect, the wearable device further includes a display module, which is used to: display a first interface, the first interface displays a pressure curve, prompt information, and a waveform of a second PPG signal, the pressure curve is an operation guide, and the prompt information is used to prompt the wearer of the pressing duration.

[0076] In combination with the second aspect, in certain implementations of the second aspect, the processing module is further used to: determine whether the wearable device meets the blood pressure measurement conditions; and if the blood pressure measurement conditions are met, emit a light signal through the first area of ​​the display screen.

[0077] In combination with the second aspect, in certain implementations of the second aspect, the measurement conditions include at least one of the following: the acceleration of the wearable device is less than or equal to the acceleration threshold, the pressure value is greater than or equal to the pressure threshold, or the angular velocity of the wearable device is less than or equal to the angular velocity threshold; wherein the acceleration is used to indicate the contact between the wearable device and the wearer, and the pressure value is used to indicate the tightness of the wearable device.

[0078] In combination with the second aspect, in certain implementations of the second aspect, the display screen is supported by a screen bracket, the screen bracket includes an optical window, and the optical window includes a PD directly below the optical window. There is a preset distance between the PD and the optical window. The PT is located at the bottom of the wearable device and is used to collect the pressure value between the wearable device and the wearing part, and the wearing part is the contact part between the wearable device and the wearer.

[0079] In a third aspect, the present application provides a wearable device, which may also be referred to as a blood pressure measuring device, including a processor, the processor is coupled to a memory, and can be used to execute instructions in the memory to implement the method in any possible implementation of the first aspect. Optionally, the wearable device also includes a memory. Optionally, the wearable device also includes a transceiver, and the processor is coupled to the transceiver.

[0080] In a fourth aspect, the present application provides a processor, comprising: an input circuit, an output circuit and a processing circuit. The processing circuit is used to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any possible implementation of the first aspect above.

[0081] In the specific implementation process, the above-mentioned processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a trigger, and various logic circuits. The input signal received by the input circuit can be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit can be, for example, but not limited to, output to a transmitter and transmitted by the transmitter, and the input circuit and the output circuit can be the same circuit, which is used as an input circuit and an output circuit at different times. This application does not limit the specific implementation of the processor and various circuits.

[0082] In a fifth aspect, the present application provides a processing device, including a processor and a memory. The processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to execute the method in any possible implementation of the first aspect.

[0083] Optionally, there are one or more processors and one or more memories.

[0084] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0085] In the specific implementation process, the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated with the processor on the same chip or can be set on different chips. This application does not limit the type of memory and the setting method of the memory and the processor.

[0086] It should be understood that the relevant data interaction process, such as sending indication information, can be a process of outputting indication information from a processor, and receiving capability information can be a process of receiving input capability information from a processor. Specifically, the processed output data can be output to a transmitter, and the input data received by the processor can come from a receiver. Among them, the transmitter and the receiver can be collectively referred to as a transceiver.

[0087] The processing device in the fifth aspect mentioned above can be a chip. The processor can be implemented by hardware or by software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor, which is implemented by reading the software code stored in the memory. The memory can be integrated in the processor or can be located outside the processor and exist independently.

[0088] In a sixth aspect, the present application provides a computer-readable storage medium, which stores a computer program (also referred to as code, or instructions) which, when executed on a computer, enables the computer to execute a method in any possible implementation of the first aspect described above.

[0089] In a seventh aspect, the present application provides a computer program product, which includes: a computer program (also referred to as code, or instructions), which, when executed, enables a computer to execute a method in any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] Figure 1 is a schematic diagram of a blood pressure measurement scenario provided in an embodiment of the present application;

[0091] Figure 2 It is a structural diagram of a communication system provided in an embodiment of the present application;

[0092] Figure 3 is a schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0093] Figure 4 is a schematic cross-sectional diagram of the hardware structure of a wearable device provided in an embodiment of the present application;

[0094] Figure 5 is a top view of a wearable device provided in an embodiment of the present application;

[0095] Figure 6 is a schematic cross-sectional diagram of the hardware structure of another wearable device provided in an embodiment of the present application;

[0096] Figure 7 is a top view of another wearable device provided in an embodiment of the present application;

[0097] Figure 8 is a schematic cross-sectional diagram of the hardware structure of another wearable device provided in an embodiment of the present application;

[0098] Fig. 9 is a schematic flow chart of a blood pressure measurement method for a wearable device provided in an embodiment of the present application;

[0099] Fig.10 is a schematic flow chart of a method for determining a measurement condition provided in an embodiment of the present application;

[0100] Fig.11 is a schematic flow chart of a method for adjusting a light emitting area provided in an embodiment of the present application;

[0101] Fig.12is a schematic flow chart of a method for calculating a blood pressure value provided in an embodiment of the present application;

[0102] Fig.13 This is a schematic diagram of a waveform curve change of a PPG signal provided in an embodiment of the present application;

[0103] Fig.14 is a schematic diagram of a waveform of a PPG signal provided in an embodiment of the present application;

[0104] Fig.15 is a schematic diagram of a blood pressure measurement interface provided in an embodiment of the present application;

[0105] Fig.16 is a schematic block diagram of a wearable device provided in an embodiment of the present application;

[0106] Fig.17 It is a schematic block diagram of another wearable device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0107] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0108] Currently, there are a variety of blood pressure measurement methods on the market. This application studies various measurement methods and finds that the accuracy of blood pressure values ​​is difficult to guarantee.

[0109] A common way to measure blood pressure is to get the blood pressure value based on the PPG signal at the wrist. The waveform of the PPG signal, also known as the pulse wave waveform, includes important characteristic information of human blood pressure. Normally, the main peak of the PPG signal waveform corresponds to the systolic pressure (that is, the high pressure in the blood pressure value), and the peak of the replay wave corresponds to the diastolic pressure (that is, the low pressure in the blood pressure value). Wearable devices include PPG modules, which contact the human skin through the PPG module to collect the human body's PPG signal.

[0110] This application studies this method and finds that this method has high requirements on the tightness of wearing. If the human skin and the PPG module are in poor contact, it will cause inaccurate PPG signals, and then lead to inaccurate blood pressure values.

[0111] Another common way to measure blood pressure is to get the blood pressure value based on the PPG signal of the fingertips. The PPG signal of the fingertips is usually better and is considered to be an ideal position for measuring blood pressure. When the wearable device detects that a finger touches the PPG module, the PPG module collects the PPG signal of the finger, and the blood pressure value is obtained after analyzing the PPG signal.

[0112] In this method, different users touch the PPG module with different strengths, which will result in different waveform characteristics of the PPG signal, leading to different measurement conditions for different users, affecting the measurement accuracy of the users. In addition, the PPG module is deployed on the side of the watch frame of the wearable device. The size of the PPG module affects the appearance design of the wearable watch, making the watch body thick and unable to be thinned, affecting the user experience. In addition, the PPG module of this method has a different structure from the PPG module for measuring the wrist, and needs to be developed separately by R&D personnel, which is not conducive to widespread application.

[0113] In order to solve the problem of different measurement conditions for different users, a pressure sensor PT is added to the PPG module of the wearable device to ensure the same measurement conditions for different users. However, considering the limited internal space of wearable products, adding a PT will cause greater stacking design difficulties and bottlenecks.

[0114] Another common method of measuring blood pressure is: the user applies pressure to the wearable device through the fingertips, the wearable device obtains the pressure of the fingertips through PT, and emits a light signal through the LED in the PPG module. The light signal is absorbed and scattered by the fingertip skin tissue to form a reflection signal, which can be received by the PD in the PPG module and converted into a PPG signal. The wearable device can obtain the blood pressure value based on the waveform of the PPG signal at the fingertips.

[0115] In this method, there is a problem that the measured blood pressure value is inaccurate.

[0116] In view of this, the embodiment of the present application provides a blood pressure measurement method and a wearable device for a wearable device, guiding the user to touch and press the screen of the wearable device with a finger, using the light-emitting unit of the screen as a measurement light source for blood pressure measurement, and using a photodiode (PD) to receive the light signal reflected by the finger, and convert the light signal into a PPG signal, and obtain the pressure value applied by the fingertip during the pressure application process through PT, and calculate the blood pressure value based on the pressure value and the waveform characteristics of the PPG signal. The method can directly measure the systolic pressure (that is, high pressure) of the blood pressure through PT, and calculate the diastolic pressure (that is, low pressure) through the waveform characteristics presented by the fingertip PPG signal. Compared with the blood pressure value calculated by regression or other calculation methods, the accuracy of the blood pressure value is improved. At the same time, the user can use a finger to directly press the screen, which is better than pressing the side of the frame to collect the fingertip pressure, and is conducive to ensuring the signal quality of the PPG signal. In addition, the method provided in the embodiment of the present application reuses the light-emitting unit of the screen, does not need to deploy a separate measurement light source, can save costs, and reduce the size of the PPG module. In addition, the embodiments of the present application can also adjust at least one of the distance between the measuring light source and the PD, the shape of the measuring light source, the distribution of the measuring light source, or the luminous intensity of the measuring light source to improve the signal quality of the PPG signal, which is conducive to improving the accuracy of the blood pressure value.

[0117] In order to better understand the embodiments of the present application, the embodiments of the present application provide a blood pressure measurement scenario.

[0118] For example, Figure 1 A schematic diagram of a blood pressure measurement scenario is shown, such as Figure 1 As shown, the blood pressure measurement scenario includes a user 101, a wearable device 102, and a terminal device 103. The user 101 wears the wearable device 102 on the wrist, and the wearable device 102 can support the function of blood pressure measurement. The terminal device 103 can perform data communication with the wearable device 102.

[0119] In this scenario, the embodiments of the present application provide two blood pressure measurement methods for wearable devices.

[0120] The first blood pressure measurement method of a wearable device, the wearable device 102 may include a PT, a PPG module and an accelerometer (Acc). The wearable device 102 may obtain the acceleration of the wearable device 102 through the Acc, and may determine whether the wearable device 102 is in a relatively static state based on the acceleration. When the wearable device 102 is in a relatively static state, the user 101 is guided to touch and press the screen of the wearable device 102 with a finger, and the light-emitting unit of the screen is used as a measurement light source for blood pressure measurement, and a photodiode (PD) is used to receive the light signal reflected by the finger, and the light signal is converted into a PPG signal, and the pressure value of the user 101 during the pressure application process is obtained through the PT, and the blood pressure value is calculated based on the pressure value and the PPG signal. The wearable device 102 can send the measured blood pressure value to the terminal device 103, and the terminal device 103 can save and display the blood pressure value.

[0121] The second blood pressure measurement method of the wearable device is that the wearable device 102 can obtain the acceleration of the wearable device 102 through Acc, determine whether the wearable device 102 is in a relatively static state, and when the wearable device 102 is in a relatively static state, guide the user 101 to touch and press the screen of the wearable device 102 with a finger, use the light-emitting unit of the screen as the measurement light source for blood pressure measurement, and use PD to receive the light signal reflected by the finger, and convert the light signal into a PPG signal, obtain the pressure value of the user 101 during the pressure application process through PT, and send the pressure value and PPG signal to the terminal device 103. The terminal device 103 can calculate the blood pressure value based on the pressure value and the PPG signal. The terminal device 103 can save and display the blood pressure value. The terminal device 103 can also send the blood pressure value to the wearable device 102, and the wearable device 102 can save and display the blood pressure value.

[0122] This blood pressure measurement method for a wearable device can save the computing power of the wearable device 102 and reduce the power consumption of the wearable device 102.

[0123] In order to better understand the embodiment of the present application, the structure of the communication system of the embodiment of the present application is introduced below. Figure 2 A schematic diagram of the structure of a communication system provided in an embodiment of the present application.

[0124] like Figure 2 As shown, the communication system may include a wearable device 100 and a terminal device 200 .

[0125] The wearable device 100 may be a smart watch, a smart bracelet, etc., which is not limited in the present embodiment. The specific technology and specific device form used by the wearable device are not limited in the present embodiment.

[0126] The terminal device 200 may be a mobile phone or a tablet, etc., which is not limited in the present embodiment. The present embodiment does not limit the specific technology and specific device form used by the terminal device.

[0127] like Figure 2 As shown, the wearable device 100 and the terminal device 200 can transmit data information to each other through the communication module.

[0128] The wearable device 100 may include a main control module 110, a pressure sensor module 120, a PPG module 130, a gyroscope module 140, a touch module 150, a display module 160, a communication module 170, a storage module 180, and an acceleration sensor module 190. The modules may be connected via a bus or other means, which is not limited in the present embodiment.

[0129] It is understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on the wearable device 100. In other embodiments of the present application, the wearable device 100 may also include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0130] The main control module 110 may include a blood pressure calculation module 111, which may be used to calculate the blood pressure value. The main control module 110 may also include one or more processors to support other functions of the wearable device 100.

[0131] The pressure sensor module 120 may be used to collect pressure data of the wearable device. In a possible implementation, the pressure sensor module 120 may be used to collect the pressure value of a finger pressing the wearable device.

[0132] The PPG module 130 may include a photodiode (PD) module 131 and an ambient light sensing module 132. The PD module 131 may include one or more PDs, which is not limited in the embodiments of the present application. The PD may be used to receive an optical signal and process the optical signal into an electrical signal. For example, in a scenario of measuring blood pressure, the PD may receive an optical signal reflected back from a fingertip tissue and process the signal into an electrical signal. The ambient light sensing module 132 may be an ambient light sensor, which may be used to sense the brightness of ambient light. For example, in a scenario of measuring blood pressure, the ambient light sensor may detect the brightness of the measuring light source.

[0133] The gyroscope module 140 may be a gyroscope sensor, which may be used to obtain angular velocity data of the wearable device 100 .

[0134] The touch module 150 may be a touch sensor, which may also be referred to as a “touch control device”.

[0135] The display module 160 may include a display screen 161 and a light emitting module 162. The light emitting module 162 may emit light to enable the display screen 161 to display content. In the scenario of measuring blood pressure, the light emitting module 162 may also be used as a measuring light source. A touch sensor may be disposed in the display screen 161, and the touch sensor and the display screen 161 may form a touch screen, which may also be referred to as a "touch screen". The touch sensor may be used to detect touch operations acting on or near it. The display screen 161 may be used to display images, videos, controls, text information, and the like.

[0136] The communication module 170 may include a Bluetooth communication module and a WLAN communication module. In some embodiments, the WLAN communication module may be integrated with other communication modules (e.g., a Bluetooth communication module). The WLAN communication module and / or the Bluetooth module may transmit signals to detect and scan devices near the wearable device 100, so that the wearable device 100 may use one or more wireless communication technologies in Bluetooth or WLAN to discover nearby devices, such as the terminal device 200. The wearable device 100 may establish a wireless communication connection with the terminal device 200 through one or more wireless communication technologies in WLAN and Bluetooth, and perform data transmission and data reception based on the wireless communication connection. The wearable device 100 may transmit data to the terminal device 200 based on one or more wireless communication technologies in the Bluetooth communication module or the WLAN communication module. The wearable device 100 may also obtain data instructions sent by the terminal device 200 through a wireless communication connection.

[0137] The storage module 180 is coupled to the main control module 110 and is used to store various software programs and / or multiple groups of instructions. In a specific implementation, the storage module 180 may include a volatile memory, such as a random access memory (RAM); it may also include a non-volatile memory, such as a ROM, a flash memory, a hard disk drive (HDD) or a solid state drive (SSD); the storage module 180 may also include a combination of the above types of memory. The storage module 180 may store some program codes so that the main control module 110 can call the program codes stored in the storage module 180 to implement the method of the embodiment of the present application.

[0138] The acceleration sensing module 190 may be an acceleration sensor, which may be used to detect the magnitude of acceleration of the wearable device 100 in various directions (generally three axes).

[0139] The terminal device 200 may include a processor 210, a communication module 220, a touch module 230, a display module 240, a storage module 250, a sensor module 260, an audio module 270, and a camera 280. The modules may be connected via a bus or other means, which is not limited in the present embodiment.

[0140] It is to be understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on the terminal device 200. In other embodiments of the present application, the terminal device 200 may also include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0141] The processor 210 may include one or more processing units. Different processing units may be independent devices or integrated into one or more processors. The processor 210 may also be provided with a memory for storing instructions and data.

[0142] The communication module 220 may include a mobile communication module and a wireless communication module. The mobile communication module may provide solutions for wireless communications including the second generation (2Generation, 2G) communication technology / the third generation (3Generation, 3G) communication technology / the fourth generation (4Generation, 4G) communication technology / the fifth generation (5Generation, 5G) communication technology applied to the terminal device 200. The mobile communication module may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The wireless communication module may provide solutions for wireless communications including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), bluetooth (blue tooth, BT), global navigation satellite system (GNSS), frequency modulation (FM), etc. applied to the terminal device 200.

[0143] The touch module 230 may be a touch sensor, which may also be referred to as a “touch control device”.

[0144] The display module 240 may be a display screen. A touch sensor may be disposed in the display screen, and the touch sensor and the display screen form a touch screen, which may also be referred to as a "touch screen". The touch sensor may be used to detect a touch operation applied thereto or thereabout. The display screen may be used to display images, videos, controls, text information, and the like.

[0145] The storage module 250 may include an internal memory or an external memory. Among them, the external memory can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the terminal device 200. The external memory card communicates with the processor 210 through the external memory to realize the data storage function. For example, files such as music and videos are stored in the external memory card. The internal memory can be used to store computer executable program codes, and the executable program codes include instructions. The internal memory may include a program storage area and a data storage area.

[0146] The sensor module 260 may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, an ambient light sensor, and a bone conduction sensor, etc. Among them, the pressure sensor is used to sense the pressure signal and can convert the pressure signal into an electrical signal. In some embodiments, the pressure sensor may be arranged on a display screen. The gyroscope sensor may be used to determine the motion posture of the terminal device 200. The air pressure sensor is used to measure the air pressure. The magnetic sensor includes a Hall sensor. The acceleration sensor may detect the magnitude of the acceleration of the terminal device 200 in all directions (generally three axes). The distance sensor is used to measure the distance. The proximity light sensor may include, for example, a light emitting diode (LED) and a light detector, such as a photodiode. The ambient light sensor is used to sense the brightness of the ambient light. The fingerprint sensor is used to collect fingerprints. The temperature sensor is used to detect the temperature. The bone conduction sensor may obtain a vibration signal.

[0147] The audio module 270 can be used to convert digital audio information into analog audio signal output, and also to convert analog audio input into digital audio signals.

[0148] The camera 280 may be used to capture static images or videos. In some embodiments, the terminal device 200 may include 1 or N cameras, where N is a positive integer greater than 1.

[0149] It should be noted that the embodiments of the present application provide Figure 2 The wearable device 100 shown can perform the first blood pressure measurement method described above, that is, the wearable device 100 determines the operating state of the wearable device 100 through the data collected by the acceleration sensor module 190, and determines the blood pressure value through the blood pressure calculation module 111 according to the data collected by the pressure sensor 120 and the PPG module 130. The wearable device 100 can store the blood pressure value through the storage module 180 and display the blood pressure value through the display module 160. The wearable device 100 can also transmit the blood pressure value to the terminal device 200 through the communication module 170.

[0150] The terminal device 200 can receive the blood pressure value through the communication module 220 , store the blood pressure value in the storage module 250 , and display the blood pressure value through the display module 240 .

[0151] The present application embodiment also provides a structural diagram of another communication system. For example, Figure 3 This is a schematic diagram of the structure of another communication system provided in an embodiment of the present application. Figure 3 As shown, the communication system may include a wearable device 300 and a terminal device 400 .

[0152] The wearable device 300 may be a smart watch, a smart bracelet, etc., which is not limited in the present embodiment. The specific technology and specific device form used by the wearable device are not limited in the present embodiment.

[0153] The terminal device 400 may be a mobile phone or a tablet, etc., which is not limited in the present embodiment. The specific technology and specific device form adopted by the terminal device 400 are not limited in the present embodiment.

[0154] like Figure 3 As shown, the wearable device 300 and the terminal device 400 can transmit data information to each other through the communication module.

[0155] The wearable device 300 may include a main control module 310, a pressure sensor module 120, a PPG module 130, a gyroscope module 140, a touch module 150, a display module 160, a communication module 170, a storage module 180, and an acceleration sensor module 190. The modules may be connected via a bus or other means, which is not limited in the present embodiment.

[0156] The main control module 310 may include one or more processors for supporting the functions of the wearable device 300. Other modules are the same as above and will not be described in detail here.

[0157] Compared with the wearable device 100, the wearable device 300 has a different main control module. The main control module 310 in the wearable device 300 does not have the blood pressure calculation module 111, that is, the wearable device 300 cannot calculate the blood pressure value, but can collect data and send the data communication module 170 to the terminal device 400. For example, the wearable device 300 collects data through the pressure sensor 120 and the PPG module 130, and sends the data to the terminal device 400 through the communication module 170. The wearable device 300 can receive the blood pressure value sent by the terminal device 400 through the communication module 170, store the blood pressure value through the storage module 180, and display the blood pressure value through the display module 160.

[0158] The terminal device 400 may include a processor 410, a communication module 220, a touch module 230, a display module 240, a storage module 250, a sensor module 260, an audio module 270, and a camera 280. The modules may be connected via a bus or other means, which is not limited in the present embodiment.

[0159] The processor 410 includes a blood pressure calculation module 211, which can be used to calculate the blood pressure value. The processor 410 may include one or more processing units. Among them, different processing units may be independent devices or integrated in one or more processors. A memory may also be provided in the processor 410 for storing instructions and data. Other modules are the same as above and will not be repeated here.

[0160] Compared with the above-mentioned terminal device 200, the processor 410 of the terminal device 400 includes a blood pressure calculation module 411, that is, the terminal device 400 can calculate the blood pressure value. Specifically, the terminal device 400 can receive the data sent by the wearable device 300 through the communication module 220, and obtain the blood pressure value according to the data through the blood pressure calculation module 411, and can store the blood pressure value in the storage module 250, and can also display the blood pressure value through the display module 240. The terminal device 400 can also send the blood pressure value to the wearable device 300 through the communication module 220.

[0161] In order to better understand the embodiments of the present application, the embodiments of the present application provide a detailed description of the hardware structure diagram of the wearable device.

[0162] For example, Figure 4 A cross-sectional schematic diagram of the hardware structure of a wearable device is shown. Figure 4 The structure shown can be applicable to the above-mentioned wearable device 102, wearable device 100 and wearable device 300, but the embodiments of the present application are not limited thereto.

[0163] like Figure 4 As shown, the display screen is used as the measuring light source, and there is a protective glass above the screen to protect the display screen. The display screen is supported by a screen bracket, and the screen bracket is made of opaque material. When the light-emitting area emits a light signal, the light emitted downward from the light-emitting area will be blocked by the bracket and cannot penetrate. The structure of the screen bracket is designed with a light-transmitting window (or optical window), the PD is below the light-transmitting window, above the circuit board, and there are PD retaining walls on the left and right sides of the PD. The PD retaining wall can be used to reflect the light signal and increase the intensity of the light signal received by the PD. Among them, the light-emitting area and the PD are staggered at a certain interval distance in the horizontal direction, which is conducive to increasing the optical path after the light propagates in the finger skin, improving the perfusion rate of the light signal, and avoiding the light directly reflected from the finger surface from being received by the PD. The interval distance between the light-emitting area and the PD in the horizontal direction is variable, and the embodiment of the present application does not limit the specific interval distance. It can be understood that the position of the PD is fixed, and the wearable device can adjust the position of the light-emitting area of ​​the screen.

[0164] The light signal emitted by the light-emitting area of ​​the display screen can be a light signal that combines red, green and blue colors, or it can be a monochrome light signal, for example, red light, green light, blue light or yellow light, which is not limited in the embodiments of the present application.

[0165] The light signal emitted by the light-emitting area of ​​the display screen passes through the protective glass and enters the finger skin tissue. The light signal is absorbed and scattered by the finger skin tissue to form a reflected signal, which is received by the PD through the light-transmitting window to form a PPG signal. Among them, only the light-emitting area of ​​the display screen emits light, and the rest of the display screen does not emit light, which can prevent the reflected light signal that has not entered the finger skin from being received by the PD, which will cause serious interference to the PPG signal.

[0166] The shape of the above-mentioned light-emitting area can be circular, elliptical, strip, square, triangular, ring or arc. The shape of the light-emitting area depends on the distribution of the lighting positions of the screen light-emitting units. The embodiment of the present application does not limit the shape and area size of the light-emitting area.

[0167] In a possible implementation manner, the shape of the light emitting area may be circular.

[0168] For example, Figure 5 FIG. 1 shows a top view of a wearable device. Figure 5 As shown, the shape of the light-emitting area is circular, and the finger touch area, that is, the area pressed by the finger, can cover the light-emitting area and PD of the screen.

[0169] It is understandable that if the shape of the light emitting area is circular, the cross-section of the hardware structure of the wearable device can be as described above. Figure 4 shown.

[0170] In another possible implementation, the shape of the light emitting area may be annular, which is more conducive to the light signal emitted by the light emitting area being emitted into the inner part of the finger skin, thereby enabling the PD to receive more light signals absorbed and scattered by the inner tissue of the finger.

[0171] When the shape of the light-emitting area is a ring, the cross-section of the hardware structure of the wearable device may be displayed as the light-emitting area being on both sides of the PD.

[0172] For example, Figure 6 A cross-sectional schematic diagram of the hardware structure of a wearable device is shown. Figure 6 As shown, the light-emitting area is on both sides of the PD, and the rest is the same as above. Figure 4 The same as shown, the embodiments of the present application are not described again here.

[0173] Figure 7 FIG. 1 shows a top view of a wearable device. Figure 7As shown, the shape of the light emitting area is a ring, and the PD is at the center of the ring and at the center of the finger touch area.

[0174] The wearable device provided in the embodiment of the present application may also include PT. PT can be deployed in the bottom sensor of the wearable device. PT can be used to detect the direct pressure value of the finger touching the screen when measuring blood pressure, and return the pressure value to the wearable device. When the pressing pressure of the finger is different, the PPG waveform will change. The PPG waveform contains important characteristic information of human blood pressure. The shape of the PPG waveform has a great relationship with the pressure value of the skin. When measuring blood pressure, it can be further combined with the actual finger pressure value to improve the measurement accuracy.

[0175] For example, Figure 8 A cross-sectional schematic diagram of the hardware structure of a wearable device is shown. Figure 8 As shown in FIG. 1 , the PT is deployed below the circuit board of the bottom sensor, the PT contacts the soft material, and its shape matches the shell of the wearable device. The structure of other parts is the same as above. Figure 6 The same as shown, the embodiments of the present application are not described again here.

[0176] When the wearable device is pressed by a finger, the user's wearing part (such as wrist skin) is pressed, and the reaction force on the bottom of the wearable product is transmitted to the PT through the soft material, and the PT can return the pressure value to the wearable device. Among them, the soft material is not limited to flexible resin, rubber or silicone materials, as long as the material can effectively transmit force, it is within the scope of the present invention.

[0177] Optionally, in this embodiment, the housing of the wearable device can be an arc-shaped design. Since the PT is placed in the middle of the wearable device at the center of the protrusion, when the wearable device contacts the wrist skin and generates pressure, the pressure value can be effectively transmitted to the PT. When the back shell of the wearable device is a flat non-arc-shaped design, the soft material used for filling can be appropriately higher than the back shell of the wearable device, so that the pressure can be effectively detected when the wearable device contacts the human skin.

[0178] The structure of the wearable device provided by the embodiment of the present application is described in detail above, and the method provided by the embodiment of the present application will be described in detail below.

[0179] It should be noted that, in addition to being used to measure blood pressure, the method provided in the embodiment of the present application can also be used to measure heart rate, blood oxygen and blood sugar, which can improve the accuracy of the measurement results.

[0180] Before describing the technical solutions of the embodiments of the present application, the following explanations are made.

[0181] First, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference.

[0182] Second, in this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0183] Third, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, where a, b, c can be single or multiple.

[0184] Fig. 9 A schematic flow chart of a blood pressure measurement method 900 for a wearable device is shown. The method can be applied to the above Figure 1 The method 900 may be performed by a wearable device, such as the one described above. Figure 1 The hardware structure diagram of the wearable device can be as follows: Figure 2 As shown, the embodiments of the present application are not limited thereto.

[0185] like Fig. 9 As shown, the method 900 may include the following steps:

[0186] S901: Detecting a user triggering operation on a blood pressure measurement option.

[0187] The wearable device may display a blood pressure measurement option through a human-computer interaction interface, and the user may click the blood pressure measurement option to enter the blood pressure measurement interface. When the user clicks the blood pressure measurement option, the wearable device may detect the user's triggering operation on the blood pressure measurement option.

[0188] S902: In response to the user triggering the blood pressure measurement option, prompt the user to properly wear the wearable device.

[0189] The wearable device can remind the user to wear the wearable device properly by voice and / or text. The content of the reminder can be "Please wear the device correctly and tightly". If the wearable device reminds by text, the reminder content can be displayed on the interface. If the wearable device reminds by voice, the reminder content can be played through the speaker. If the wearable device reminds by voice and text, the reminder content can be played through the speaker and displayed through the interface.

[0190] Before testing the wearable device, the user is reminded to wear the wearable device in a standardized manner, which is conducive to better contact between the wearable device and the skin, and is conducive to improving the quality of the collected PPG signal, thereby improving the accuracy of blood pressure measurement.

[0191] S903: Determine whether the measurement conditions are met.

[0192] The wearable device determines whether the measurement conditions are met, that is, the wearable device determines whether blood pressure measurement can be performed at this time. If the measurement conditions are met, it can be explained that the state at this time can effectively measure blood pressure, and the accuracy of the blood pressure value is high. If the measurement conditions are not met, it can be explained that the state at this time cannot effectively measure blood pressure, and the accuracy of the blood pressure value is low. Among them, the measurement conditions can also be referred to as blood pressure measurement conditions, which are not limited in the embodiments of the present application.

[0193] The measurement condition may include at least one of the following: the wearable device is in a relatively static state, the wearable device is in good contact with the skin, and the wearable device is not tilted or tilted.

[0194] The wearable device can obtain the acceleration of the wearable device through Acc to determine whether the wearable device is in a relatively static state. The wearable device can obtain the pressure value through PT to determine whether the wearable device is in good contact with the skin. The wearable device can obtain angular velocity data through a gyroscope to determine whether the wearable device is tilted or tilted, but the embodiments of the present application are not limited thereto.

[0195] S904: If the measurement conditions are met, prompt the user to start blood pressure measurement.

[0196] The wearable device can remind the user to wear the wearable device properly by voice and / or text. The content of the reminder can be "Please start blood pressure measurement". If the wearable device reminds by text, the reminder content can be displayed on the interface. If the wearable device reminds by voice, the reminder content can be played through the speaker. If the wearable device reminds by voice and text, the reminder content can be played through the speaker and displayed through the interface.

[0197] S905: Detecting a user triggering operation to start a blood pressure measurement option.

[0198] Starting the blood pressure measurement option may also be referred to as starting the blood pressure measurement option, which is not limited in this embodiment of the present application.

[0199] The wearable device can start the blood pressure measurement option through the human-computer interaction interface, and the user can click the start blood pressure measurement option to start the blood pressure measurement. When the user clicks the start blood pressure measurement option, the wearable device can perform blood pressure measurement.

[0200] S906: In response to the user's triggering operation to start the blood pressure measurement option, guide the user to touch a designated area on the screen.

[0201] The wearable device can guide the user to touch a specified area on the screen through at least one prompt in the form of text, sound, picture or icon.

[0202] For example, the wearable device can display the fingerprint in a designated area of ​​the screen to guide the user to touch the fingerprint area. The wearable device can guide the user to touch the fingerprint area through text, and the text content can be "Please place your finger in the fingerprint display area." The wearable device can also guide the user to touch the fingerprint area through sound, and the sound content can be "Please place your finger in the fingerprint display area."

[0203] The screen designated area can be the above Figure 5 or Figure 7 The finger touch area is shown, but the embodiments of the present application are not limited to this.

[0204] S907: Detecting the user's touch operation on a designated area of ​​the screen.

[0205] When the user touches a designated area of ​​the screen according to the guidance, the wearable device can detect the user's operation of touching the designated area of ​​the screen.

[0206] S908. In response to the user touching a designated area of ​​the screen, control the luminous area of ​​the screen to emit light.

[0207] The wearable device controls the screen light-emitting area to emit light, that is, controls the screen light-emitting area to emit a light signal. The screen light-emitting area may also be referred to as the first area, which is not limited in the present embodiment of the application.

[0208] The screen luminous area can be the above Figure 5 or Figure 7 The light emitting area is shown, but the embodiments of the present application are not limited to this.

[0209] S909: guiding the user to continuously apply pressure to the wearable device according to the operating instructions.

[0210] The wearable device can guide the user to continuously apply pressure to the wearable device through text, sound, image or color, that is, the operation instructions can be text, sound, image or color, and the embodiments of the present application are not limited to this. In one possible implementation, the operation instructions can be "Please increase the pressing pressure". The wearable device can guide the user through sound and / or text. In another possible implementation, the wearable device displays a pressure curve through a human-computer interaction interface to guide the user to continuously apply pressure to the wearable device according to the pressure curve.

[0211] The wearable device can guide the user to continuously apply pressure to the screen of the wearable device for a period of time according to the operating instructions, and the pressure of the continuous pressure is perpendicular to the screen. The embodiment of the present application does not limit the duration of the continuous pressure. In a possible implementation, the duration of the continuous pressure can be 30 seconds.

[0212] It should be noted that the continuous pressure application process is a process of increasing pressure. In the embodiment of the present application, the blood vessels in the skin in contact with the wearable device are squeezed by the user continuously applying pressure to measure blood pressure.

[0213] S910: Obtain stability of the wearable device during the process of user pressure application.

[0214] On the one hand, in order to prevent the wearable device from shaking during the pressure application process, which would affect data collection and further affect the accuracy of the blood pressure value, the wearable device obtains the stability of the wearable device during the user's pressure application process.

[0215] For example, the wearable device may obtain the acceleration of the wearable device through Acc to determine whether the wearable device is in a shaking state.

[0216] On the other hand, in order to prevent the user from applying uneven force during the pressure process, causing the wearable device to tilt or warp, affecting data collection and further affecting the accuracy of the blood pressure value, the wearable device obtains the stability of the wearable device during the user's pressure application process.

[0217] For example, the wearable device may obtain the angular velocity of the wearable device through a gyroscope to determine whether the wearable device is in a skewed or warped state.

[0218] S911. Determine whether the stability condition meets the data collection requirements.

[0219] During the pressure application process, if the wearable device is in a shaking state or a skewed or warped state, the pressure data and PPG signal will be inaccurate, which will affect the data collection. If the wearable device is in a non-shaking state or a non-skewed or warped state, the pressure data and PPG signal are relatively accurate, and data collection can be performed, which meets the data collection requirements.

[0220] The wearable device determines whether the stability meets the data collection requirements, that is, the wearable device determines whether the wearable device is in a shaking state or a skewed or warped state during the pressure application process.

[0221] If the stability of the wearable device during the user's pressure application meets the data collection requirements, data collection can be performed, that is, S912 is executed. If the stability of the wearable device during the user's pressure application does not meet the data collection requirements, the blood pressure measurement can be ended, that is, S915 is executed.

[0222] S912: If the stability condition meets the data collection requirements, continue to collect pressure data and the PPG signal corresponding to the pressure data.

[0223] If the stability meets the data collection requirements, the wearable device can continuously collect pressure data and PPG signals corresponding to the pressure data. That is, during the user's pressure application, the wearable device can collect multiple pressure data and simultaneously collect PPG signals corresponding to each pressure data. The number of pressure data can be n, where n is an integer greater than or equal to 2.

[0224] Optionally, the wearable device can display the waveform of the PPG signal in real time on the display interface.

[0225] S913. Obtain a blood pressure value according to the pressure data and a PPG signal corresponding to the pressure data.

[0226] When the user applies pressure, the pressure increases continuously. Different pressure values ​​correspond to different PPG signals. The wearable device can obtain the blood pressure value based on multiple pressure data and the PPG signals corresponding to each pressure data.

[0227] S914: Save and display the blood pressure value.

[0228] Blood pressure values ​​include SBP and DBP. Wearable devices can measure blood pressure values ​​and save the test time of blood pressure values.

[0229] Optionally, the wearable device may also display the blood pressure value on the interface. After displaying the blood pressure value, the wearable device may wait for the user's operation, or may display an option to measure again to facilitate measuring the blood pressure again, or may display an option to exit to end the blood pressure measurement.

[0230] S915: If the stability does not meet the data collection requirements, the blood pressure measurement is terminated, and the user is prompted that the stability of the wearable device is poor during the process.

[0231] If the stability of the wearable device during the user's pressure application does not meet the data collection requirements, the blood pressure measurement can be terminated, and the user can be prompted with text or sound that the stability of the wearable device is poor during the process.

[0232] S916: Display a re-measurement option.

[0233] The wearable device can also display an option for re-measurement through a human-computer interaction interface to facilitate the user to measure again.

[0234] S917: Detecting a user triggering operation on a re-measurement option.

[0235] When the wearable device detects the user's triggering operation on the re-measurement option, the above S906 to S917 may be executed.

[0236] The blood pressure measurement method of the wearable device provided in the embodiment of the present application determines whether the measurement conditions are met before measuring the blood pressure, and performs the measurement on the basis of meeting the measurement conditions, which is conducive to improving the accuracy of the blood pressure value. After starting the blood pressure measurement, the user is guided to apply pressure, which is beneficial to the user experience, and the blood pressure value is calculated based on the pressure value and the PPG signal, which is conducive to ensuring the accuracy of the blood pressure value compared to the calculation method that only uses the PPG signal. During the process of the user applying pressure, it is also necessary to judge the stability of the wearable device, which is conducive to ensuring the accuracy of data collection, thereby improving the accuracy of the blood pressure value.

[0237] As an optional embodiment, the measurement condition may include that the wearable device is in a relatively static state and that the wearable device is in good contact with the skin.

[0238] For example, Fig.10 FIG. 1 is a schematic flow chart of a method 1000 for determining a measurement condition. Fig.10 As shown, the method 1000 may include the following steps:

[0239] S1001. Obtain the acceleration of the wearable device through Acc.

[0240] The wearable device can obtain the Acc signal, and the data carried by the signal is the acceleration of the wearable device.

[0241] S1002: Determine whether the acceleration is less than or equal to the acceleration threshold.

[0242] The acceleration threshold is preset, and the embodiment of the present application does not limit the specific value of the acceleration threshold.

[0243] If the acceleration is less than or equal to the acceleration threshold, it can be said that the wearable device is in a relatively static state, and other conditions can be judged, that is, execution 1003. If the acceleration is greater than the acceleration threshold, it can be said that the wearable device is not in a relatively static state or is in a shaking state, and the user can be prompted to wear the wearable device properly, that is, execution 1006.

[0244] S1003: If the acceleration is less than or equal to the acceleration threshold, obtain the pressure value between the wearable device and the contact part through PT, where the contact part is the part where the wearable device contacts the user when the wearable device is worn.

[0245] Wearable devices can obtain PT signals, and the data carried by the signals is the pressure value.

[0246] The pressure value between the wearable device and the contact part can be used to determine the contact condition between the wearable device and the contact part.

[0247] S1004: Determine whether the pressure value is greater than or equal to the pressure threshold.

[0248] The pressure threshold is preset, and the embodiment of the present application does not limit the specific value of the pressure threshold.

[0249] If the pressure value is greater than or equal to the pressure threshold, it can be said that the wearable device is in good contact with the contact part (skin or wrist), that is, the wearing tightness is appropriate, and other conditions can be judged, that is, execution 1005. If the pressure value is less than the pressure threshold, it can be said that the wearable device is not in good contact with the contact part (skin or wrist), that is, the wearing is loose, and the user can be prompted to wear the wearable device properly, that is, execution 1006.

[0250] S1005: If the pressure value is greater than or equal to the pressure threshold, it can be determined that the wearable device meets the measurement condition.

[0251] The wearable device can determine that the wearable device meets the measurement condition when the wearable device meets the following conditions:

[0252] The acceleration is less than or equal to the acceleration threshold and the pressure value is greater than or equal to the pressure threshold.

[0253] S1006: Prompt the user to wear the wearable device properly.

[0254] When the wearable device meets at least one of the following conditions, the wearable device may determine that the wearable device does not meet the measurement conditions and prompt the user to wear the wearable device properly:

[0255] The acceleration is greater than an acceleration threshold; and / or the pressure value is less than a pressure threshold.

[0256] It should be noted that the embodiment of the present application does not limit the execution order of the above S1002 and S1004.

[0257] If the wearable device meets the measurement conditions, blood pressure measurement can be performed, that is, S904 is executed. If the wearable device does not meet the measurement conditions, the user can continue to be prompted to wear the wearable device properly, that is, S902 is executed.

[0258] The method provided in the embodiment of the present application determines whether measurement conditions are met before blood pressure measurement, and performs measurement on the basis that the measurement conditions are met, which is conducive to improving the accuracy of blood pressure values.

[0259] As an optional embodiment, between S908 and S909 above, the embodiment of the present application further provides a method for adjusting the light-emitting area, by adjusting at least one of the area size, position or shape of the light-emitting area to ensure the signal quality of the PPG signal.

[0260] For example, Fig.11 FIG. 1 is a schematic flow chart of a method 1100 for adjusting a light emitting area. Fig.11 As shown, the method 1100 may include the following steps:

[0261] After executing S908 and controlling the luminous area of ​​the screen to emit light, the wearable device can execute S1101.

[0262] S1101. The wearable device obtains an initial pressure value and an initial PPG signal.

[0263] The wearable device can obtain the initial pressure value of the finger touching the screen through PT, and use PD to convert the received light signal into a PPG signal to obtain an initial PPG signal.

[0264] It should be noted that the initial pressure value and the initial PPG signal are obtained when the user touches the screen but before the user starts to apply pressure. It should be understood that the initial pressure value and the initial PPG signal are merely examples of names, and the embodiments of the present application do not limit this. Among them, the initial PPG signal can be understood as the first PPG signal, and the embodiments of the present application do not limit this.

[0265] S1102: Determine whether the initial PPG signal meets the signal quality requirement.

[0266] The wearable device determines whether the initial PPG signal meets the signal quality requirement, that is, determines whether the initial PPG signal under the initial pressure value meets the signal quality requirement.

[0267] Wearable devices can determine whether the initial PPG signal meets the signal quality requirements in a variety of ways.

[0268] In a possible implementation, whether the signal quality requirement is met is determined by the waveform characteristics of the initial PPG signal.

[0269] Exemplarily, the wearable device can extract the waveform features of the initial PPG signal through a feature extraction model, and compare the waveform features of the initial PPG signal with preset waveform features to determine whether the initial PPG signal meets the signal quality requirements.

[0270] Optionally, before extracting the waveform features of the initial PPG signal, the wearable device may perform noise reduction and / or filtering processing on the initial PPG signal to ensure the accuracy of waveform feature extraction.

[0271] In another possible implementation, whether the initial PPG signal meets the signal quality requirement is determined by waveform characteristics of different optical signals.

[0272] For example, the wearable device can use the waveforms of the green light signal, the red light signal, and the infrared light signal for similarity or correlation comparison to determine whether the initial PPG signal meets the signal quality requirements.

[0273] If the initial PPG signal meets the signal quality requirements, it can be said that the PPG signal quality is good, and the user can be guided to continue to apply pressure to the wearable device according to the operating instructions, that is, S909 can be executed. If the initial PPG signal does not meet the signal quality requirements, it can be said that the PPG signal quality is not good, and the screen light-emitting area can be adjusted, that is, S1103 can be executed.

[0274] S1103: Adjust at least one of the position, luminous brightness, area size or shape of the screen luminous area to obtain a new screen luminous area.

[0275] The wearable device can determine how to adjust based on the reason why the PPG signal does not meet the signal quality requirements.

[0276] In one possible implementation, if the initial PPG signal does not meet the signal quality requirements because the perfusion rate of the PPG signal is low, the wearable device can increase the horizontal spacing between the screen light-emitting area and the PD, that is, change the position of the screen light-emitting area to obtain a PPG signal that meets the signal quality requirements.

[0277] In another possible implementation, if the initial PPG signal does not meet the signal quality requirements because the PPG signal is too weak, the wearable device can brighten the brightness of the screen's luminous area to obtain a PPG signal that meets the signal quality requirements. If the PPG signal is too weak and the luminous brightness of the screen's luminous area has reached the maximum adjustable value, the wearable device can shorten the horizontal distance between the screen's luminous area and the PD, that is, change the position of the screen's luminous area, and increase the strength of the PPG signal by reducing the optical path to obtain a PPG signal that meets the signal quality requirements.

[0278] In another possible implementation, the wearable device can use a signal patrol method. When a finger touches the screen, the touch sensor is used to locate the exact position where the finger touches the screen and the size of the touch area. The horizontal spacing distance between the screen luminous area and the PD is changed in the area touched by the finger, that is, the position of the screen luminous area is changed in turn, and the PPG signals at each position are collected, and the PPG signal that meets the signal quality requirements is selected, and the corresponding position is determined as the position of the screen luminous area.

[0279] The shape of the screen light-emitting area can be circular, elliptical, bar, square, triangular or arc-shaped, etc., which is not limited in the embodiments of the present application. There can be a corresponding relationship between the screen light-emitting area and the position of the screen light-emitting area, and the corresponding relationship can be a one-to-one, one-to-many or many-to-one relationship, which is not limited in the embodiments of the present application. The corresponding relationship can be preset. When the wearable device determines the position of the screen light-emitting area, the shape of the screen light-emitting area is determined according to the position of the screen light-emitting area and the corresponding relationship. Different shapes of screen light-emitting areas have different PPG signal qualities.

[0280] In another possible implementation, if there is no corresponding relationship between the screen luminous area and the position of the screen luminous area, and the PPG signal does not meet the signal quality requirements, the wearable device can change the shape of the screen luminous area in sequence, and collect PPG signals under each shape, select the PPG signal that meets the signal quality requirements, and determine the corresponding shape as the shape of the screen luminous area.

[0281] The size of the screen light-emitting area may be variable, and the size of the screen light-emitting area may be related to the position of the screen light-emitting area.

[0282] In another possible implementation, if the PPG signal does not meet the signal quality requirements, the wearable device can change the area size of the screen luminous area according to the reduction standard or the enlargement standard, and collect PPG signals under various area sizes, select the PPG signal that meets the signal quality requirements, and determine the corresponding area size as the area size of the screen luminous area.

[0283] S1104, controlling the new screen luminous area to emit light.

[0284] Wearable devices can use the new screen luminous area as a measurement light source and control it to emit light signals.

[0285] S1105: Acquire a new PPG signal.

[0286] The wearable device uses PD to receive the light signal reflected by the finger and converts the light signal into a PPG signal to obtain a new PPG signal.

[0287] S1106: Determine whether the new PPG signal meets the signal quality requirement.

[0288] If the new PPG signal meets the signal quality requirements, the user can be guided to continue to apply pressure to the wearable device according to the operation instructions, that is, S909 can be executed. If the new PPG signal still does not meet the signal quality requirements, at least one of the position, brightness, area or shape of the screen light-emitting area can be further adjusted, that is, S1103 can be executed.

[0289] The method for adjusting the luminous area provided in the embodiment of the present application can ensure that a PPG signal that meets the signal quality requirements can be collected by adjusting at least one of the position, luminous brightness, area size or shape of the luminous area of ​​the screen, which is beneficial to improving the accuracy of subsequent blood pressure measurement.

[0290] As an optional embodiment, the above S913, according to the pressure data and the PPG signal corresponding to the pressure data, obtains the blood pressure value. If there are multiple pressure data, there are multiple PPG signals corresponding to the pressure data, and the wearable device can obtain the blood pressure value according to the multiple pressure values ​​and the multiple PPG signals.

[0291] For example, Fig.12 FIG. 1 is a schematic flow chart of a method 1200 for calculating a blood pressure value. Fig.12 As shown, the method 1200 may include the following steps:

[0292] S1201. During the continuous pressing process by the user, obtain the first to nth pressure values.

[0293] During the pressure application process, the pressure increases continuously, the first pressure value is the smallest among the n pressure values, and the nth pressure value is the largest among the n pressure values. The value of n can be 3, 5, or 10, which is not limited in the present embodiment.

[0294] S1202: Obtain a PPG signal corresponding to each pressure value.

[0295] While obtaining the first pressure value, the wearable device can also obtain the PPG signal corresponding to this pressure value. That is, the wearable device controls the light-emitting area of the screen to emit light, receives the light signal reflected by the fingertip through the PD, converts the reflected light signal into an electrical signal, and then converts the electrical signal into a PPG signal for blood pressure measurement. By analogy, the wearable device can obtain the PPG signal corresponding to each pressure value, and thus obtain n PPG signals.

[0296] Different pressure values correspond to different PPG signals, and the waveforms of the PPG signals under different pressure values are different. When the pressure value of the finger pressing the wearable device is small, the contact between the finger skin and the plane is poor, and the waveform signal detected by the PPG sensor is weak. The pulse beat amplitude of the waveform of the PPG signal is small. As the pressure gradually increases, the contact between the finger and the screen becomes better and better. The light signal emitted by the light-emitting area of the screen can be more effectively incident on the finger, and the more light signals reflected by the finger can be received by the PD. The pulse beat amplitude of the waveform of the PPG signal becomes larger and larger and reaches the maximum. After that, as the pressure gradually increases, the pressure affects the pulsation of the blood vessels in the finger, causing the stroke volume to be continuously limited to form blood vessel compression, and the pulse beat amplitude of the waveform of the PPG signal gradually decreases until the waveform curve becomes flat and there is no pulse form. In the embodiment of the present application, the pressure applied by the user can make the pulse beat amplitude of the waveform of the PPG signal increase from small to large until the maximum, and then decrease from large to small until the waveform curve becomes flat.

[0297] Exemplarily, Fig.13 shows a schematic diagram of the change in the waveform curve of the PPG signal. As Fig.13 shown, n is equal to 7. When n = 1, the pressure value is P1. When n = 2, the pressure value is P2. When n = 3, the pressure value is P3. When n = 4, the pressure value is P4. When n = 5, the pressure value is P5. When n = 6, the pressure value is P6. When n = 7, the pressure value is P7, where P1 < P2 < P3 < P4 < P5 < P6 < P7. At a certain pressure value (P1, P2, P3, P4, P5, P6, or P7), the waveform of the PPG signal changes continuously with time. As the pressure value continuously increases, that is, in the process from P1 to P7, the pulse beat amplitude of the waveform of the PPG signal increases from small to large until the maximum, and then decreases from large to small until the waveform curve becomes flat. It can be seen from Fig.13 that the pulse beat amplitude of the waveform of the PPG signal corresponding to the fourth pressure value is the largest. The waveform curve of the PPG signal corresponding to the seventh pressure value is flat and there is no pulse form.

[0298] S1203. Extract the waveform features of each PPG signal.

[0299] The wearable device can extract the waveform features of each PPG signal through a feature extraction model. The waveform morphology of each PPG signal includes physiological characteristics of the human body. The waveform features of each PPG signal may include at least one of the height of the main peak of the PPG waveform, the height of the descending isthmus, the height of the replay wave amplitude, the pulse transmission time, the diastolic time, the systolic time, the waveform rise time and the fall time.

[0300] For example, Fig.14 FIG. 1 is a schematic diagram showing a waveform of a PPG signal. Fig.14 As shown in the figure, taking a pulse cycle as an example, the waveform of the PPG signal is explained. Point O is the starting point of the cardiac ejection period, point A is the highest point of aortic pressure, reflecting the maximum value of pressure and volume in the artery, point B is the left ventricular ejection stop point, which is the peak point of the reflected wave, also called the tidal wave peak, reflecting the tension, compliance and peripheral resistance of the arterial blood vessels, and point D is the tidal wave trough point, that is, the dividing point between cardiac contraction and diastole, which mainly reflects the size of peripheral resistance.

[0301] The OA segment waveform is the ascending branch of the pulse waveform. It is caused by the rapid increase of arterial blood pressure when the arterial wall suddenly expands and the left ventricle ejects blood, resulting in the expansion of the wall. Cardiac output, ejection velocity and resistance are the main factors affecting the amplitude and slope of the ascending branch. Generally, the slope and amplitude of the rising pulse waveform are used to represent it. The slope is larger and the amplitude is higher when the cardiac output is larger, the ejection velocity is faster, the aortic elasticity is better and the resistance is smaller. On the contrary, the slope is smaller and the amplitude is lower. The AD segment waveform is the front segment of the descending branch. It is caused by the ejection velocity starting to decrease in the later stage of ventricular ejection, resulting in the amount of blood flowing to the periphery of the aorta being greater than the amount of blood flowing into the aorta, the large artery changes from expansion to retraction, and the arterial blood pressure gradually decreases. The DO1 segment waveform is the rear segment of the descending branch, also called the dicrotic wave, which is formed by the ventricular expansion, the continuous decrease of arterial blood pressure, and the reflux of blood in the aorta toward the ventricle. It reflects the functional status of the aorta, vascular elasticity and blood flow status.

[0302] Wearable devices can extract waveform features of PPG signals such as the main peak height, descending isthmus height, replay wave amplitude height, pulse conduction time, diastolic time, systolic time, waveform rise time and fall time.

[0303] S1204. Determine a PPG signal without waveform features from the n PPG signals, where the PPG signal is the i-th signal.

[0304] The wearable device can determine a PPG signal without waveform features from n PPG signals according to the waveform features of each PPG signal. The PPG signal without waveform features is the i-th PPG signal, i is greater than or equal to 1, and i is less than or equal to n. The n PPG signals can become multiple second PPG signals, and the PPG signal without waveform features can be called a target second PPG signal, which is not limited in the embodiments of the present application.

[0305] For example, in the above Fig.13 In the example shown, the seventh PPG signal is a PPG signal without waveform features, i=7.

[0306] S1205: Determine the pressure value corresponding to the PPG signal without waveform features as systolic blood pressure (SBP).

[0307] The pressure value corresponding to the PPG signal without waveform features is the i-th pressure value, and the wearable device can determine the i-th pressure value as the systolic pressure.

[0308] For example, in the above Fig.13 In the example shown, the 7th PPG signal is a PPG signal without waveform features, i=7, and the wearable device can determine the 7th pressure value as the systolic pressure.

[0309] S1206. Input the first to i-th pressure values ​​and the waveform features of the PPG signal corresponding to each pressure value into the neural network model 1 to obtain the diastolic blood pressure (DBP).

[0310] The wearable device can input the first pressure value and the waveform characteristics of the PPG signal corresponding to the first pressure value to the ith pressure value and the waveform characteristics of the PPG signal corresponding to the ith pressure value into the neural network model 1 to obtain DBP.

[0311] It should be noted that the input of the neural network model 1 is the pressure value and the waveform characteristics of the PPG signal corresponding to the pressure value, and the output is DBP. The neural network model 1 can be obtained through training with a large amount of historical data.

[0312] The blood pressure calculation method provided in the embodiment of the present application can directly measure the SBP (that is, the high pressure) of the blood pressure through PT, and calculate the DBP (that is, the low pressure) through the waveform characteristics presented by the PPG signal. Compared with the blood pressure value calculated by regression or other calculation methods, the accuracy of the blood pressure value is improved.

[0313] As an optional embodiment, the above-mentioned S914, the wearable device can display the blood pressure value.

[0314] The wearable device can display the measured blood pressure value on the interface, and can also display the pressure curve on the interface to guide the user to continuously apply pressure according to the pressure curve, and can also display the waveform of the PPG signal.

[0315] For example, Fig.15 FIG. 1 shows a schematic diagram of a blood pressure measurement interface. Fig.15 As shown in interface a in the figure, the wearable device can use text to guide the user to touch the fingerprint area with a finger, and the text content can be "Place your finger at the icon position, please press to measure". The wearable device can use the pressure curve to guide the user to continuously apply pressure perpendicular to the wearable device, and the upper and lower limits of the pressure curve are displayed on the interface to regulate the user's behavior of applying pressure.

[0316] like Fig.15 As shown in the b interface in , when the wearable device detects that the user has touched the fingerprint area, it can guide the user to continue to apply pressure to the wearable device through the voice "When measuring, please apply downward pressure to the watch body to keep the black dot on the pressure curve", so that the pressure sensor at the bottom of the wearable device can detect the continuous change in pressing pressure. During the user's pressure application process, the interface can also display the countdown time of pressure application, for example, a countdown of 10 seconds (second, s), prompting the user to continue to apply pressure for a long time. At the same time, the interface can also display prompts such as color or sound to guide the user to apply pressure correctly and ensure the measurement requirements. That is, during the measurement process, downward pressure should be maintained to avoid measurement errors caused by skewness or warping of the wearable device. During the user's pressure application process, the wearable device collects pressure data and obtains the PPG signal of the fingertip under the pressure data.

[0317] like Fig.15 As shown in the c interface in FIG. 1 , after the wearable device determines the SBP and DBP according to the above method 1200 , the blood pressure values ​​are displayed on the interface, namely, the systolic pressure: 120 millimetres of mercury (mmHg) and the diastolic pressure: 70 mmHg.

[0318] The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0319] Combined with the above Figures 1 to 15 , describes in detail the method provided by the embodiment of the present application, and will be combined with Fig.16 and Fig.17 , describe in detail the equipment provided in the embodiments of the present application.

[0320] Fig.16A schematic flow chart of a wearable device 1600 provided in an embodiment of the present application is shown. The wearable device 1600 includes: a processing module 1610 and an acquisition module 1620. The wearable device 1600 can be used to execute the above-mentioned methods. For example, the wearable device 1600 can be used to execute at least one of the above-mentioned methods 900, 1000, 1100 and 1200.

[0321] It should be understood that the wearable device 1600 here is embodied in the form of a functional module. The term "module" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combined logic circuit and / or other suitable components that support the described functions. In an optional example, a person skilled in the art may understand that the wearable device 1600 may be specifically a wearable device in the above method embodiment, or the function of the wearable device in the above method embodiment may be integrated in the wearable device 1600, and the wearable device 1600 may be used to execute the various processes and / or steps corresponding to the wearable device in the above method embodiment. To avoid repetition, it will not be repeated here.

[0322] The wearable device 1600 has the function of implementing the corresponding steps performed by the wearable device in the above method embodiment; the above functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0323] In the embodiments of the present application, Fig.16 The wearable device 1600 may also be a chip or a chip system, for example, a system on chip (SoC).

[0324] Fig.17 1 is a schematic block diagram of another wearable device 1700 provided in an embodiment of the present application. The flight status recognition device 1700 includes a processor 1710, a transceiver 1720, and a memory 1730. The processor 1710, the transceiver 1720, and the memory 1730 communicate with each other through an internal connection path, the memory 1730 is used to store instructions, and the processor 1720 is used to execute the instructions stored in the memory 1730 to control the transceiver 1720 to send and / or receive signals.

[0325] It should be understood that the wearable device 1700 can be specifically a wearable device in the above method embodiment, or the function of the wearable device in the above method embodiment can be integrated in the wearable device 1700, and the wearable device 1700 can be used to execute the various steps and / or processes corresponding to the wearable device in the above method embodiment. Optionally, the memory 1730 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type. The processor 1710 may be used to execute instructions stored in the memory, and when the processor executes the instruction, the processor may execute the various steps and / or processes corresponding to the wearable device in the above method embodiment.

[0326] It should be understood that in the embodiment of the present application, the processor 1710 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0327] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in a processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0328] The present application also provides a computer-readable storage medium, which is used to store a computer program, and the computer program is used to implement the method corresponding to the wearable device in the above method embodiment.

[0329] The present application also provides a chip system, which is used to support the wearable device in the above method embodiment to implement the functions shown in the embodiment of the present application.

[0330] The present application also provides a computer program product, which includes a computer program code (also referred to as code, or instruction). When the computer program code runs on a computer, the computer can execute the method corresponding to the wearable device shown in the above method embodiment.

[0331] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0332] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0333] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0334] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0335] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0336] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0337] The above is only a specific implementation of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the embodiments of the present application, which should be included in the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be based on the protection scope of the claims.

Claims

1. A blood pressure measurement method for a wearable device, characterized in that: The wearable device comprises a pressure sensor PT, a display screen and a photodiode PD; The method comprises: emitting a light signal through a first area of ​​the display screen; Converting the optical signal received by the PD into a first PPG signal; If the first PPG signal does not meet the signal quality requirement, emitting a light signal through a second area of ​​the display screen, wherein the second area is different from the first area in at least one of the following features: position on the display screen, luminous brightness, area size or shape; Converting the optical signal received by the PD into a second PPG signal; When the second PPG signal meets the signal quality requirement, outputting an operation guide, wherein the operation guide is used to guide the wearer to continuously increase the pressure perpendicular to the contact surface between the wearable device and human skin applied to the wearable device in a preset pressing area; Obtaining the pressure value collected by the PT; determining a blood pressure value of the wearer according to the pressure value and the second PPG signal; The pressure value includes a plurality of pressure values, the second PPG signal includes a plurality of second PPG signals, the plurality of pressure values ​​correspond to the plurality of second PPG signals one by one, and each pressure value in the plurality of pressure values ​​and the corresponding second PPG signal are collected at the same time; The determining the blood pressure value of the wearer according to the pressure value and the second PPG signal includes: Extracting a waveform feature of each second PGG signal from the plurality of second PPG signals; Inputting the waveform features of the plurality of pressure values ​​and the plurality of second PPG signals into a neural network model, wherein the neural network model is trained based on the waveform features of historical pressure values ​​and historical PPG signals and is used for blood pressure measurement; The output of the neural network model is determined as the diastolic pressure DBP in the wearer's blood pressure value.

2. The method according to claim 1, characterized in that: The first PPG signal does not meet the signal quality requirement, including: a perfusion rate of the first PPG signal is less than or equal to a preset perfusion rate; A distance between a projection area of ​​the PD on the display screen and the second area is greater than a distance between a projection area of ​​the PD on the display screen and the first area.

3. The method according to claim 1, characterized in that The first PPG signal does not meet the signal quality requirement, including: the intensity of the first PPG signal is less than or equal to a preset intensity; The light emitting brightness of the second region is greater than the light emitting brightness of the first region.

4. The method according to claim 3, characterized in that The luminous brightness of the second area is a maximum value; The method further comprises: If the second PPG signal does not meet the signal quality requirement, emitting an optical signal through a third area of ​​the display screen, wherein a distance between a projection area of ​​the PD on the display screen and the third area is smaller than a distance between a projection area of ​​the PD on the display screen and the first area; Converting the optical signal received by the PD into a third PPG signal; If the third PPG signal meets the signal quality requirement, obtaining the pressure value collected by the PT; The wearer's blood pressure value is determined according to the pressure value and the third PPG signal.

5. The method according to claim 1, characterized in that: The shape of the second region is different from that of the first region.

6. The method according to claim 1, characterized in that The area size of the second region is different from the area size of the first region.

7. The method according to any one of claims 1 to 6, characterized in that The pressure value includes a plurality of pressure values, the second PPG signal includes a plurality of second PPG signals, the plurality of pressure values ​​correspond to the plurality of second PPG signals one by one, and each pressure value in the plurality of pressure values ​​and the corresponding second PPG signal are collected at the same time; The determining the blood pressure value of the wearer according to the pressure value and the second PPG signal includes: extracting a waveform feature of each second PPG signal among the plurality of second PPG signals; If there is a target second PPG signal among the multiple second PPG signals whose waveform feature is less than or equal to the preset waveform feature, the pressure value corresponding to the target second PPG signal is determined as the systolic blood pressure SBP in the wearer's blood pressure value.

8. The method according to claim 1, characterized in that: The method further comprises: During the wearer's pressure application process, if the following conditions are met, the blood pressure measurement is terminated: The acceleration of the wearable device is greater than an acceleration threshold; and / or, The angular velocity of the wearable device is greater than an angular velocity threshold.

9. The method according to claim 8, characterized in that The method further comprises: A first interface is displayed, wherein the first interface displays a pressure curve, prompt information, and a waveform of the second PPG signal, wherein the pressure curve is the operation guide, and the prompt information is used to prompt the wearer of the pressing duration.

10. The method according to any one of claims 1 to 5, 7 to 9, characterized in that: Before emitting the light signal through the first area of ​​the display screen, the method further includes: Determining whether the wearable device meets the blood pressure measurement conditions; The emitting a light signal through the first area of ​​the display screen comprises: When the blood pressure measurement condition is met, a light signal is emitted through the first area of ​​the display screen.

11. The method according to claim 10, characterized in that The measurement conditions include at least one of the following: The acceleration of the wearable device is less than or equal to the acceleration threshold, the pressure value is greater than or equal to the pressure threshold, or the angular velocity of the wearable device is less than or equal to the angular velocity threshold; The acceleration is used to indicate the contact between the wearable device and the wearer, and the pressure value is used to indicate the tightness of wearing the wearable device.

12. The method according to any one of claims 5, 7-9, and 11, characterized in that: The display screen is supported by a screen bracket, and the screen bracket includes an optical window. The PD is included directly below the optical window. There is a preset distance between the PD and the optical window. The PT is located at the bottom of the wearable device and is used to collect the pressure value between the wearable device and the wearing part, and the wearing part is the contact part between the wearable device and the wearer.

13. A wearable device, characterized in that: include: A processor, wherein the processor is coupled to a memory, wherein the memory is used to store a computer program, and when the processor calls the computer program, the wearable device executes the method as claimed in any one of claims 1 to 12.

14. A computer-readable storage medium, characterized in that: Used to store a computer program, the computer program comprising instructions for implementing the method according to any one of claims 1 to 12.

15. A computer program product, characterized in that The computer program product includes a computer program code, and when the computer program code is executed on a computer, the computer is enabled to implement the method according to any one of claims 1 to 12.

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