Blood pressure measurement method and device, electronic equipment and storage medium

Abstract

This application proposes a blood pressure measurement method, device, electronic device, and storage medium. The method includes: obtaining a personalized optimal contact pressure range for a target subject; controlling the contact pressure between a photoplethysmography (PPG) sensor and the target subject's skin within this personalized optimal contact pressure range; acquiring the PPG signal collected by the PPG sensor; and obtaining the target subject's blood pressure value based on the PPG signal. This application can control the contact pressure between the PPG sensor and the target subject's skin during continuous blood pressure measurement based on a pre-determined personalized optimal contact pressure range, ensuring the contact pressure remains within this range. This improves the quality of the acquired PPG signal and thus enhances the accuracy of blood pressure measurement.

Description

Technical Field

[0001] This application relates to the field of non-invasive continuous blood pressure monitoring technology, and in particular to a blood pressure measurement method, device, electronic device and storage medium. Background Technology

[0002] Blood pressure is an important physiological indicator reflecting the function of the human cardiovascular system, and there is a close causal relationship between blood pressure levels and the risk of morbidity and mortality from cardiovascular and cerebrovascular diseases. In recent years, the incidence of hypertension has been rising continuously, and it often leads to complications such as heart disease and stroke, seriously threatening human health. Compared with a single blood pressure measurement, continuous blood pressure monitoring can reduce the influence of random factors on the measurement results, allow people to understand the pattern of blood pressure changes, provide medical staff with long-term blood pressure information for patients, and help improve the accuracy of cardiovascular system status assessment. Summary of the Invention

[0003] This application aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, the first aspect of this application proposes a method for measuring blood pressure, comprising:

[0005] Obtain the personalized optimal contact pressure range for the target object;

[0006] The contact pressure between the photoplethysmography (PPG) sensor and the skin of the target object is controlled to be within the personalized optimal contact pressure range.

[0007] The PPG signal collected by the PPG sensor is acquired, and the blood pressure value of the target object is obtained based on the PPG signal.

[0008] A second aspect of this application discloses a blood pressure measuring device, comprising:

[0009] A negative feedback control unit is used to determine the personalized optimal contact pressure range of the target object and control the contact pressure between the photoplethysmography (PPG) sensor and the skin of the target object to be within the personalized optimal contact pressure range.

[0010] The blood pressure calculation unit is used to acquire the PPG signal collected by the PPG sensor and to obtain the blood pressure value of the target object based on the PPG signal.

[0011] A third aspect of this application discloses an electronic device comprising:

[0012] Photoplethysmography (PPG) sensor;

[0013] Pressure sensor;

[0014] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method described in the first aspect above.

[0015] A fourth aspect of this application provides a computer-readable storage medium in which, when instructions in the storage medium are executed by a processor of an electronic device, the electronic device is able to perform the method described in the first aspect above.

[0016] According to the blood pressure measurement method of this application embodiment, based on a pre-determined personalized optimal contact pressure range for the target object, the contact pressure between the PPG sensor and the target object's skin is controlled during continuous blood pressure measurement of the target object, so that the contact pressure is within the personalized optimal contact pressure range, which can improve the quality of the acquired PPG signal and thus improve the accuracy of blood pressure measurement.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic flowchart of a blood pressure measurement method provided in an embodiment of this application;

[0020] Figure 2 A flowchart illustrating a method for determining a personalized optimal contact pressure range for the implementation of this application;

[0021] Figure 3 This is a schematic diagram of a blood pressure measuring device provided in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of another blood pressure measuring device provided in the embodiments of this application;

[0023] Figure 5 This is a structural block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0025] Currently, using optical principles to measure photoplethysmography (PPG) signals to estimate blood pressure has become the mainstream cuffless continuous blood pressure measurement technology. This approach eliminates cuff interference and, being non-invasive, also avoids the risk of infection. However, when continuously acquiring PPG signals, it is difficult to ensure that the contact pressure between the PPG sensor and the patient's skin remains constant. This contact pressure significantly affects the PPG signal waveform, influencing not only the amplitude but also the temporal location of key points, thus impacting the accuracy of blood pressure measurement.

[0026] Therefore, this application proposes a blood pressure measurement method, apparatus, electronic device, and storage medium. In continuous blood pressure measurement, the contact pressure between the PPG sensor and the skin of the subject is adjusted to improve the PPG signal quality, thereby improving the accuracy of blood pressure measurement. Specifically, embodiments of the blood pressure measurement method, apparatus, electronic device, and storage medium of this application are described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic flowchart illustrating a blood pressure measurement method provided in an embodiment of this application. Figure 1 As shown, this blood pressure measurement method includes the following steps:

[0028] Step 101: Obtain the personalized optimal contact pressure range for the target object.

[0029] It should be noted that the contact pressure refers to the contact pressure between the PPG sensor and the target object's skin. The PPG sensor can be configured in wearable devices such as wristbands and watches. Different target objects have different personalized optimal contact pressure ranges, which are predetermined. Within the personalized optimal contact pressure range, the PPG signal quality acquired by the PPG sensor is optimal, for example, the PPG signal amplitude is the largest and the signal-to-noise ratio is the strongest. The method for determining the personalized optimal contact pressure range of the target object in the embodiments of this application can be found in the description of subsequent embodiments of this application, and will not be repeated here.

[0030] Step 102: Control the contact pressure between the photoplethysmography (PPG) sensor and the target object's skin to be within the personalized optimal contact pressure range.

[0031] Optionally, in some embodiments of this application, the contact pressure between the PPG sensor and the target object's skin and the personalized optimal contact pressure range can be obtained from the pressure sensor, and the contact pressure can be adaptively adjusted based on a negative feedback adjustment mechanism to control the contact pressure to be within the personalized optimal contact pressure range.

[0032] As an example, the contact pressure between the PPG sensor and the target skin, collected by a pressure sensor, can be acquired and compared to a personalized optimal contact pressure range. If the contact pressure is greater than the maximum value within the personalized optimal contact pressure range, the actuator controls the reduction of the contact pressure between the PPG sensor and the target skin until the contact pressure falls within the personalized optimal contact pressure range. If the contact pressure is less than the minimum value within the personalized optimal contact pressure range, the actuator controls the increase of the contact pressure between the PPG sensor and the target skin until the contact pressure falls within the personalized optimal contact pressure range. If the contact pressure collected by the pressure sensor is within the personalized optimal contact pressure range, no adjustment of the contact pressure between the PPG sensor and the target skin is required. The pressure sensor, actuator, and PPG sensor are all housed within the same wearable device.

[0033] As another example, the contact pressure between the PPG sensor and the target object's skin, collected by the pressure sensor, can be compared with a personalized optimal contact pressure range. If the contact pressure is greater than the maximum value within the personalized optimal contact pressure range, a first prompt message is generated to remind the target object to reduce the contact pressure between the PPG sensor and the target object's skin until the contact pressure falls within the personalized optimal contact pressure range. If the contact pressure is less than the minimum value within the personalized optimal contact pressure range, a second prompt message is generated to remind the target object to increase the contact pressure between the PPG sensor and the target object's skin until the contact pressure falls within the personalized optimal contact pressure range.

[0034] Step 103: Obtain the PPG signal collected by the PPG sensor, and obtain the blood pressure value of the target object based on the PPG signal.

[0035] Optionally, in some embodiments of this application, the PPG signal acquired by the PPG sensor is preprocessed and feature values ​​are calculated. The blood pressure value of the corresponding target object is then obtained through a pre-trained blood pressure estimation model. Alternatively, in other embodiments of this application, an ECG (electrocardiogram) signal can also be acquired. The blood pressure value of the corresponding target object is obtained by combining the PPG signal, the ECG signal, and the corresponding blood pressure estimation model.

[0036] According to the blood pressure measurement method of this application embodiment, based on a pre-determined personalized optimal contact pressure range for the target object, the contact pressure between the PPG sensor and the target object's skin is controlled during continuous blood pressure measurement of the target object, so that the contact pressure is within the personalized optimal contact pressure range, which can improve the quality of the acquired PPG signal and thus improve the accuracy of blood pressure measurement.

[0037] Figure 2 A flowchart illustrating a method for determining a personalized optimal contact pressure range, provided for the implementation of this application. Figure 2 As shown, the method may include, but is not limited to, the following steps.

[0038] Step 201: Divide the preset contact pressure range into multiple contact pressure sub-ranges.

[0039] As an example, the preset contact pressure range can be set to 0.2N-2N, and divided into multiple sub-ranges of 0.2N-0.3N, 0.3N-0.4N, ..., 1.9N-2N with a fixed interval of 0.1. It should be noted that the preset contact pressure range and the fixed interval values ​​in this embodiment are merely illustrative examples and do not constitute a limitation of this application.

[0040] Step 202: Obtain the PPG signal collected by the PPG sensor under each contact pressure sub-range.

[0041] In some embodiments of this application, the controllable actuator controls the contact pressure between the PPG sensor and the target object's skin to be within different contact pressure sub-ranges, and collects the PPG signal collected under each contact pressure sub-range.

[0042] Step 203: Determine the signal quality factor of each PPG signal based on the PPG signals collected under each contact pressure sub-interval.

[0043] In some embodiments of this application, a template PPG signal and multiple test PPG signals can be determined from the PPG signals collected under each contact pressure sub-interval. For example, in a 10-second PPG signal collected under a certain contact pressure sub-interval, the first 2 seconds of the PPG signal are used as the template PPG signal, and in the last 8 seconds of the PPG signal, each second of the PPG signal is used as a test PPG signal.

[0044] The template PPG signal is normalized as shown in formula (1). Multiple test PPG signals are normalized as shown in formula (2).

[0045] X NoRM = (X-μ) X ) / σ X(1)

[0046] Y NORM = (Y-μ) Y ) / σ Y (2)

[0047] Where X is the test PPG signal (vector), X NORM For the normalized test PPG signal, μ X To test the average value of the PPG signal, σ X To test the standard deviation of the PPG signal, Y is the template PPG signal (vector). NORM For the normalized template PPG signal, μ Y σ is the average value of the template PPG signal. Y denoted as the standard deviation of the template PPG signal.

[0048] Based on the normalized template PPG signal Y NORM and multiple test PPG signals X NORM The cross-correlation coefficients between the template PPG signal and the test PPG signal and the time delay are obtained, as shown in formulas (3) and (4).

[0049]

[0050]

[0051] Where m represents the sampling point index in the PPG signal, n represents the time delay, fs is the sampling frequency, and ρ XY This represents a test PPG signal X. NORM Template PPG signal Y NORM The cross-correlation coefficient with time delay, max(ρ) XY [n]) represents the maximum cross-correlation coefficient ρ for different values ​​of n. XY , ρ YY Indicates template PPG signal Y NORM The autocorrelation coefficient between the two and the time delay, max(ρ) YY [n]) represents the maximum autocorrelation coefficient ρ for different values ​​of n. YY .

[0052] Based on the cross-correlation coefficients between the template PPG signal and the test PPG signal and the time delay, and the template PPG signal, multiple first signal quality factors between the multiple test PPG signals and the template PPG signal are obtained, as shown in formula (5). The average value of the multiple first signal quality factors of each PPG signal is determined as the signal quality factor of each PPG signal.

[0053]

[0054] As an example, suppose the preset contact pressure range is divided into three contact pressure sub-ranges: contact pressure sub-range A, contact pressure sub-range B, and contact pressure sub-range C. A 7-second PPG signal 'a' is acquired in contact pressure sub-range A. The first 2 seconds of PPG signal are designated as the template PPG signal (defined as the Y vector), and each second of the signal in the remaining 5 seconds is designated as a test PPG signal (defined as the X vector), namely test PPG signal 1, test PPG signal 2, test PPG signal 3, test PPG signal 4, and test PPG signal 5. The template PPG signal, test PPG signal 1, test PPG signal 2, test PPG signal 3, test PPG signal 4, and test PPG signal 5 are normalized respectively. Multiple first signal quality factors are then obtained between the template PPG signal and each of the test PPG signals 1, 2, 3, 4, and 5. The average value of these multiple first signal quality factors corresponding to PPG signal a in contact pressure sub-interval A is determined as the signal quality factor of PPG signal a in contact pressure sub-interval A. It should be noted that the method for obtaining the signal quality factor corresponding to the PPG signals acquired in contact pressure sub-intervals B and C is the same as the method for obtaining the signal quality factor of PPG signal a acquired in contact pressure sub-interval A, and will not be repeated here.

[0055] Step 204: Based on the signal quality factor of each PPG signal, determine the personalized optimal contact pressure range from multiple contact pressure sub-ranges.

[0056] It should be noted that the higher the signal quality factor value of a PPG signal, the higher the signal quality. Therefore, in some embodiments of this application, the signal quality factor with the largest value among multiple PPG signals can be determined as the target signal quality factor. The contact pressure sub-interval corresponding to this target signal quality factor is determined as the personalized optimal contact pressure interval. For example, among the signal quality factors of multiple PPG signals, the PPG signal acquired within the contact pressure sub-interval of 0.5N-0.6N has the largest signal quality factor value; therefore, the contact pressure sub-interval of 0.5N-0.6N is taken as the personalized optimal contact pressure interval for the target object.

[0057] It should also be noted that the personalized optimal contact pressure range for the target individual can be determined during each consecutive blood pressure measurement, or it can be determined and stored during the first measurement, and then directly called upon in subsequent measurements. Alternatively, the personalized optimal contact pressure range for the target individual can be redefined at predetermined intervals to adapt to the individual's physical condition and further improve the accuracy of blood pressure measurement.

[0058] By implementing the embodiments of this application, the personalized optimal contact pressure range of the target object can be determined in advance before continuous blood pressure measurement, so as to adapt to the different physical conditions of the target object and ensure the acquisition quality of PPG signal during subsequent blood pressure measurement to a certain extent.

[0059] Figure 3 This is a schematic diagram of a blood pressure measuring device provided in an embodiment of this application. Figure 3 As shown, the blood pressure measuring device includes a negative feedback control unit 301 and a blood pressure calculation unit 302. Among them,

[0060] The negative feedback control unit 301 is used to determine the personalized optimal contact pressure range of the target object and control the contact pressure between the photoplethysmography (PPG) sensor and the skin of the target object to be within the personalized optimal contact pressure range.

[0061] In some embodiments of this application, the negative feedback control unit 301 is specifically used to: acquire the contact pressure between the PPG sensor and the target object's skin collected by the pressure sensor; compare the contact pressure with the personalized optimal contact pressure range; and adjust the contact pressure between the PPG sensor and the target object's skin to be within the personalized optimal contact pressure range in response to the contact pressure not being within the personalized optimal contact pressure range.

[0062] In some embodiments of this application, the negative feedback control unit 301 is specifically configured to: reduce the contact pressure between the PPG sensor and the target skin in response to the contact pressure being greater than the maximum value within the personalized optimal contact pressure range, until the contact pressure between the PPG sensor and the target skin is within the personalized optimal contact pressure range; or, increase the contact pressure between the PPG sensor and the target skin in response to the contact pressure being less than the minimum value within the personalized optimal contact pressure range, until the contact pressure between the PPG sensor and the target skin is within the personalized optimal contact pressure range.

[0063] The blood pressure calculation unit 302 is used to acquire the PPG signal collected by the PPG sensor and obtain the blood pressure value of the target object based on the PPG signal.

[0064] Optionally, in some embodiments of this application, such as Figure 4 As shown, the blood pressure measuring device may further include a determining unit 403. The determining unit 403 is used to divide a preset contact pressure range into multiple contact pressure sub-ranges; acquire PPG signals collected by the PPG sensor in each contact pressure sub-range; determine the signal quality factor of each PPG signal based on the PPG signals collected in each contact pressure sub-range; and determine a personalized optimal contact pressure range from the multiple contact pressure sub-ranges based on the signal quality factor of each PPG signal. Figure 4 In 401 and 402 with Figure 3 301 and 302 have the same function and structure.

[0065] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0066] According to the blood pressure measuring device of this application embodiment, the contact pressure between the PPG sensor and the skin of the target object is controlled during the continuous blood pressure measurement of the target object based on the predetermined personalized optimal contact pressure range of the target object, so that the contact pressure is within the personalized optimal contact pressure range, which can improve the quality of the acquired PPG signal and thus improve the accuracy of blood pressure measurement.

[0067] To implement the above embodiments, this application also provides an electronic device. Figure 5 This is a structural block diagram of an electronic device provided in an embodiment of this application. Figure 5 As shown, the electronic device 500 includes: a photoplethysmography (PPG) sensor 501, a pressure sensor 502, a memory 503, a processor 504, and a computer program 505 stored in the memory 503 and executable on the processor 504. When the processor 504 executes the computer program 505, it implements the blood pressure measurement method described in any of the above embodiments of this application.

[0068] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium, which, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform the blood pressure measurement method described in any of the above embodiments of this application.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0072] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0073] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0074] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0075] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0076] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for measuring blood pressure, characterized in that, Includes the following steps: Obtain the personalized optimal contact pressure range for the target object; The contact pressure between the photoplethysmography (PPG) sensor and the skin of the target object is controlled to be within the personalized optimal contact pressure range. The PPG signal collected by the PPG sensor is acquired, and the blood pressure value of the target object is obtained based on the PPG signal; The personalized optimal contact pressure range is predetermined in the following manner: The preset contact pressure range is divided into multiple contact pressure sub-ranges; Acquire the PPG signal collected by the PPG sensor under each of the contact pressure sub-intervals; The signal quality factor of each PPG signal is determined based on the PPG signal collected under each contact pressure sub-interval; Based on the signal quality factor of each PPG signal, the personalized optimal contact pressure range is determined from the plurality of contact pressure sub-ranges; The step of determining the signal quality factor of each PPG signal based on the PPG signal collected under each contact pressure sub-interval includes: Based on the PPG signals collected under each of the contact pressure sub-intervals, the template PPG signal and multiple test PPG signals in each PPG signal are determined; The template PPG signal and the plurality of test PPG signals are respectively normalized; Based on the normalized template PPG signal and the plurality of test PPG signals, obtain the cross-correlation coefficients between the template PPG signal and the test PPG signal and the time delay; Based on the cross-correlation coefficient between the template PPG signal and the test PPG signal and the time delay, and the template PPG signal, obtain multiple first signal quality factors between the multiple test PPG signals and the template PPG signal; The average value of the plurality of first signal quality factors of each PPG signal is determined as the signal quality factor of each PPG signal.

2. The method as described in claim 1, characterized in that, The control of the contact pressure between the photoplethysmography (PPG) sensor and the target skin to be within the personalized optimal contact pressure range includes: The contact pressure between the PPG sensor and the target object's skin, collected by the pressure sensor, is obtained. Compare the contact pressure with the personalized optimal contact pressure range; In response to the contact pressure not being within the personalized optimal contact pressure range, the contact pressure between the PPG sensor and the target skin is adjusted to be within the personalized optimal contact pressure range.

3. The method as described in claim 2, characterized in that, Adjusting the contact pressure between the PPG sensor and the target skin to be within the personalized optimal contact pressure range includes: In response to the contact pressure exceeding the maximum value within the personalized optimal contact pressure range, the contact pressure between the PPG sensor and the target skin is reduced until the contact pressure between the PPG sensor and the target skin falls within the personalized optimal contact pressure range; or... In response to the contact pressure being less than the minimum value within the personalized optimal contact pressure range, the contact pressure between the PPG sensor and the target skin is increased until the contact pressure between the PPG sensor and the target skin is within the personalized optimal contact pressure range.

4. The method as described in claim 1, characterized in that, The step of determining the personalized optimal contact pressure range from multiple contact pressure sub-ranges based on the signal quality factor of each PPG signal includes: The signal quality factor with the largest value among the signal quality factors of the multiple PPG signals is determined as the target signal quality factor; The contact pressure sub-interval corresponding to the target signal quality factor is determined as the personalized optimal contact pressure interval.

5. A blood pressure measuring device, characterized in that, include: A negative feedback control unit is used to determine the personalized optimal contact pressure range of the target object and control the contact pressure between the photoplethysmography (PPG) sensor and the skin of the target object to be within the personalized optimal contact pressure range. A blood pressure calculation unit is used to acquire the PPG signal collected by the PPG sensor and to obtain the blood pressure value of the target object based on the PPG signal. The device further includes a determining unit, wherein the determining unit is configured to: The preset contact pressure range is divided into multiple contact pressure sub-ranges; The PPG signal collected by the PPG sensor under each contact pressure sub-range is acquired; The signal quality factor of each PPG signal is determined based on the PPG signal collected under each contact pressure sub-interval; Based on the signal quality factor of each PPG signal, the personalized optimal contact pressure range is determined from the plurality of contact pressure sub-ranges; The step of determining the signal quality factor of each PPG signal based on the PPG signal collected under each contact pressure sub-interval includes: Based on the PPG signals collected under each of the contact pressure sub-intervals, the template PPG signal and multiple test PPG signals in each PPG signal are determined; The template PPG signal and the plurality of test PPG signals are respectively normalized; Based on the normalized template PPG signal and the plurality of test PPG signals, obtain the cross-correlation coefficients between the template PPG signal and the test PPG signal and the time delay; Based on the cross-correlation coefficient between the template PPG signal and the test PPG signal and the time delay, and the template PPG signal, obtain multiple first signal quality factors between the multiple test PPG signals and the template PPG signal; The average value of the plurality of first signal quality factors of each PPG signal is determined as the signal quality factor of each PPG signal.

6. An electronic device, comprising: Photoplethysmography (PPG) sensor; Pressure sensor; A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the program, it implements the method as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor of the electronic device, the electronic device is able to perform the method of any one of claims 1-4.

Images