Blood pressure detection method and system, electronic equipment and readable storage medium

Abstract

The invention relates to the technical field of blood pressure detection, and discloses a blood pressure detection method and system, electronic equipment and a readable storage medium. In the blood pressure detection method, an imaging picture including the position of a blood vessel can be firstly obtained through ultrasonic B scanning, and the position of the blood vessel, the center coordinate of the blood vessel and the initial diameter of the blood vessel can be determined through the imaging picture; furthermore, ultrasonic signals can be transmitted to the position where the blood vessel is located through ultrasonic A scanning, ultrasonic echo signals are obtained, and the diameter of the blood vessel is obtained based on the ultrasonic echo signals. And calculating the pulse wave conduction velocity based on the diameter waveforms of the two different positions on the blood vessel. Finally, the blood pressure value can be calculated through the blood vessel diameter and the pulse wave conduction speed. In this way, real-time monitoring of the blood pressure of the user can be achieved through the intelligent wearable device.

Description

Technical Field

[0001] The present application relates to the technical field of blood pressure detection, and in particular to a blood pressure detection method, system, electronic device and readable storage medium. Background Art

[0002] Blood pressure detection is an effective means of obtaining human blood pressure parameters to measure human health. To achieve safe blood pressure monitoring, smart wearable devices such as smart watches or smart bracelets can be used to detect blood pressure. For example, an inflatable and deflable cuff can be designed in a smart wearable device to assist in obtaining blood pressure values, that is, blood pressure is detected using the blood pressure detection principle of the cuff pressurization method. The cuff pressurization method refers to the use of a cuff to compress arterial blood flow, reducing blood flow, thereby recording changes in arterial systolic and diastolic pressure through sensors to obtain blood pressure values. For another example, blood pressure can be detected in a smart wearable device by collecting ECG signals and photoelectric volumetric pulse wave signals, and then using modeling to detect blood pressure based on the collected ECG signals and photoelectric volumetric pulse wave signals.

[0003] However, the blood pressure detection method based on the cuff pressurization method cannot monitor blood pressure in real time throughout the day, and has strict requirements on the measurement posture, which is not very convenient. Photoelectric sensors are used to detect physiological signals such as electrocardiogram signals and pulse wave signals to detect blood pressure values, but the relationship between electrocardiogram signals and pulse wave signals and blood pressure is not direct, and the measurement accuracy is low.

[0004] Therefore, it is necessary to establish a method that can monitor blood pressure over a long period of time, in real time and accurately. Summary of the invention

[0005] In order to obtain accurate blood pressure values ​​in real time, the embodiments of the present application provide a blood pressure detection method, system, electronic device and readable storage medium.

[0006] In a first aspect, an embodiment of the present application provides a blood pressure detection method, which is applied to an electronic device. The blood pressure detection method includes: based on an ultrasonic B-scan, obtaining an image of a first imaging area and an image of a second imaging area of ​​a first arterial blood vessel in an area to be detected; based on an ultrasonic A-scan, obtaining a first blood vessel diameter waveform of the first arterial blood vessel in the first imaging area, and obtaining a second blood vessel diameter waveform of the first arterial blood vessel in the second imaging area; obtaining a pulse wave conduction velocity based on the first blood vessel diameter waveform and the second blood vessel diameter waveform; and calculating a blood pressure value based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave conduction velocity.

[0007] Based on the above scheme, based on the correlation between blood vessel diameter, pulse wave velocity and blood pressure, smart wearable devices such as smart watches can be used to obtain the user's accurate blood pressure value in real time over a long period of time.

[0008] In a second aspect, an embodiment of the present application provides a blood pressure detection device, which includes a first ultrasonic transducer and a second ultrasonic transducer, wherein the first ultrasonic transducer and the second ultrasonic transducer are parallel to each other, and the first ultrasonic transducer and the second ultrasonic transducer are respectively perpendicular to a first arterial blood vessel; the first ultrasonic transducer and the second ultrasonic transducer each include a plurality of sections, each section of the first ultrasonic transducer and the second ultrasonic transducer is arranged at intervals, and each section of the first ultrasonic transducer and the second ultrasonic transducer is composed of a plurality of ultrasonic array elements; the distance between the first ultrasonic transducer and the second ultrasonic transducer along the blood vessel direction is The distance is less than a first distance threshold, and the distance is the distance between the center of the first ultrasonic transducer and the center of the second ultrasonic transducer; the array element distances of the first ultrasonic transducer and the second ultrasonic transducer are both less than the first array element distance threshold, wherein the array element distance refers to the distance between the array element centers of any two ultrasonic array elements in each section of the first ultrasonic transducer and the second ultrasonic transducer; the array element gap between any two ultrasonic array elements in each section of the first ultrasonic transducer and the second ultrasonic transducer is less than the first array element gap threshold; the pitch between each section of the first ultrasonic transducer and the second ultrasonic transducer is less than the first pitch threshold.

[0009] In a possible implementation of the first aspect, the electronic device includes a first ultrasonic transducer and a second ultrasonic transducer; based on the first blood vessel diameter waveform and the second blood vessel diameter waveform, the pulse wave velocity of the first arterial blood vessel is determined in the following manner:

[0010]

[0011] Wherein, PWV is the pulse wave velocity, ΔL is the distance between the first ultrasonic transducer and the second ultrasonic transducer along the blood vessel direction, and Δt is the time difference between the characteristic points on the first blood vessel diameter waveform and the second blood vessel diameter waveform in the same cardiac cycle on the two blood vessel diameter waveforms.

[0012] In a possible implementation of the first aspect above, a first blood vessel diameter waveform is obtained through an ultrasonic A-scan method based on a first imaging area through a first ultrasonic transducer, including: the first ultrasonic transducer transmits an ultrasonic wave through the first blood vessel center of a first arterial blood vessel through an ultrasonic A-scan method, scans the first arterial blood vessel, obtains an ultrasonic echo, and obtains a first peak point and a second peak point in the ultrasonic echo; obtains the front and back wall positions of the first arterial blood vessel based on the first peak point and the second peak point; obtains the first blood vessel diameter of the first arterial blood vessel based on the front and back wall positions of the first blood vessel; and repeats the ultrasonic A-scan to obtain the first blood vessel diameter waveform of the first arterial blood vessel.

[0013] In a possible implementation of the first aspect above, a second blood vessel diameter waveform is obtained through an ultrasonic A-scan method based on a second imaging area through a second ultrasonic transducer, including: the second ultrasonic transducer transmits an ultrasonic wave through the center of a second blood vessel of a first arterial blood vessel through an ultrasonic A-scan method, scans the first arterial blood vessel, obtains an ultrasonic echo, and obtains a third peak point and a fourth peak point in the ultrasonic echo; based on the third peak point and the fourth peak point, the positions of the front and back walls of the second blood vessel of the first arterial blood vessel are obtained; based on the positions of the front and back walls of the second blood vessel, the second blood vessel diameter of the first arterial blood vessel is obtained; and the ultrasonic A-scan is repeated to obtain the second blood vessel diameter waveform of the first arterial blood vessel.

[0014] In a possible implementation of the first aspect above, the first ultrasonic transducer transmits ultrasonic waves through the center of the first artery through an ultrasonic A-scan method, scans the first artery, obtains an ultrasonic echo, and acquires a first peak point and a second peak point in the ultrasonic echo, including: acquiring a first ultrasonic echo signal through the first ultrasonic transducer, based on the first imaging area, through an ultrasonic A-scan method, performing envelope detection, smoothing, and normalization on the first ultrasonic echo signal to acquire a second ultrasonic echo signal; and acquiring the first peak point and the second peak point based on the second ultrasonic echo signal.

[0015] In a possible implementation of the first aspect above, the second ultrasonic transducer transmits ultrasonic waves through the center of the second blood vessel of the first artery through an ultrasonic A-scan method, scans the first artery, obtains an ultrasonic echo, and acquires a third peak point and a fourth peak point in the ultrasonic echo, including: acquiring a third ultrasonic echo signal through the second ultrasonic transducer, based on the second imaging area, through an ultrasonic A-scan method, performing envelope detection, smoothing, and normalization on the third ultrasonic echo signal to acquire a fourth ultrasonic echo signal; and acquiring a third peak point and a fourth peak point based on the fourth ultrasonic echo signal.

[0016] In a possible implementation of the first aspect above, based on the second ultrasonic echo signal, obtaining the first peak point and the second peak point includes: performing peak detection on the second ultrasonic echo signal, obtaining the first peak point and the second peak point in the region of interest of the front and back walls of the first blood vessel, the first peak point being a point in the region of interest of the front wall of the first blood vessel whose distance from the coordinates of the center of the first blood vessel is less than a third distance threshold, and the second peak point being a point in the region of interest of the back wall of the first blood vessel whose distance from the coordinates of the center of the first blood vessel is less than a fourth distance threshold.

[0017] In a possible implementation of the first aspect above, based on the fourth ultrasonic echo signal, obtaining a third peak point and a fourth peak point includes: performing peak detection on the fourth ultrasonic echo signal, obtaining a third peak point and a fourth peak point in the region of interest of the front and back walls of the second blood vessel, the third peak point being a point in the region of interest of the front wall of the second blood vessel whose distance from the coordinates of the center of the second blood vessel is less than a fifth distance threshold, and the fourth peak point being a point in the region of interest of the back wall of the second blood vessel whose distance from the coordinates of the center of the second blood vessel is less than a sixth distance threshold.

[0018] In a possible implementation of the first aspect above, the regions of interest of the front and rear walls of the first blood vessel are determined in the following manner: based on an image of a first imaging area of ​​the first arterial vessel, a first center coordinate and a first preliminary blood vessel diameter of the first arterial vessel are acquired; based on the first center coordinates of the first arterial vessel and the first preliminary blood vessel diameter of the first arterial vessel, the regions of interest of the front and rear walls of the first blood vessel are determined.

[0019] In a possible implementation of the first aspect above, the regions of interest of the front and back walls of the second blood vessel are determined in the following manner: based on an image of the second imaging area of ​​the first arterial vessel, the second center coordinates and the second preliminary blood vessel diameter of the first arterial vessel are acquired; based on the second center coordinates of the first arterial vessel and the second preliminary blood vessel diameter of the first arterial vessel, the regions of interest of the front and back walls of the second blood vessel of the first arterial vessel are determined.

[0020] In a possible implementation of the first aspect above, based on the front and back wall positions of the first blood vessel, obtaining a first blood vessel diameter of the first arterial blood vessel includes: the front and back wall positions of the first blood vessel include a first blood vessel front wall position and a first blood vessel back wall position; the first blood vessel front wall position is determined based on a first blood vessel front wall area of ​​interest and a first peak point; the first blood vessel back wall position is determined based on the first blood vessel back wall area of ​​interest and a second peak point; and the first blood vessel diameter is determined based on the first blood vessel front wall position and the first blood vessel back wall position.

[0021] In a possible implementation of the first aspect above, based on the front and back wall positions of the second blood vessel, obtaining the second blood vessel diameter of the first arterial blood vessel includes: the front and back wall positions of the second blood vessel include the front wall position of the second blood vessel and the back wall position of the second blood vessel, determining the front wall position of the second blood vessel based on the second blood vessel front wall area of ​​interest and the third peak point, determining the back wall position of the second blood vessel based on the second blood vessel back wall area of ​​interest and the fourth peak point; determining the second blood vessel diameter based on the second blood vessel front wall position and the second blood vessel back wall position.

[0022] In a possible implementation of the first aspect above, determining a first blood vessel front and back wall region of interest of the first arterial vessel based on a first center coordinate of the first arterial vessel and a first preliminary blood vessel diameter of the first arterial vessel includes: determining the first preliminary blood vessel front and back wall positions of the first arterial vessel based on the first center coordinates and the first preliminary blood vessel diameter; acquiring the first blood vessel front and back wall region of interest based on the first preliminary blood vessel front and back wall positions, the blood vessel diameter change rate, and the first preliminary blood vessel diameter.

[0023] In a possible implementation of the first aspect above, based on the second center coordinates of the first arterial blood vessel and the second preliminary blood vessel diameter of the first arterial blood vessel, determining the second blood vessel front and back wall region of interest of the first arterial blood vessel includes: determining the second preliminary blood vessel front and back wall position of the first arterial blood vessel based on the second center coordinates and the second preliminary blood vessel diameter; acquiring the second blood vessel front and back wall region of interest based on the second preliminary blood vessel front and back wall position, the blood vessel diameter change rate and the second preliminary blood vessel diameter.

[0024] In a possible implementation of the first aspect above, the blood pressure value includes diastolic pressure and systolic pressure; the blood pressure value is calculated based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave conduction velocity, including: calculating the diastolic pressure and systolic pressure based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave conduction velocity through the Hayashi model and the Bramwell-Hill model.

[0025] In a possible implementation of the first aspect above, the blood pressure value is calculated based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave conduction velocity, and also includes: based on a deep learning model, the blood pressure value is obtained through the first blood vessel diameter waveform and the pulse wave conduction velocity or the second blood vessel diameter waveform and the pulse wave conduction velocity or the average of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave conduction velocity; based on the deep learning model, the blood pressure value is calculated through the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average of the first blood vessel diameter waveform and the second blood vessel diameter waveform.

[0026] In a possible implementation of the first aspect above, based on ultrasonic B-scan, an image of a first imaging area and an image of a second imaging area of ​​a first arterial blood vessel in an area to be detected are acquired, including: based on a first ultrasonic transducer, by emitting an ultrasonic plane wave, or emitting an ultrasonic focused wave and changing the focal position for line scanning, to acquire the image of the first imaging area; based on a second ultrasonic transducer, by emitting an ultrasonic plane wave, or emitting an ultrasonic focused wave and changing the focal position for line scanning, to acquire the image of the second imaging area.

[0027] In a possible implementation of the first aspect above, based on ultrasonic A-scan, obtaining a first blood vessel diameter waveform and a second blood vessel diameter waveform includes: based on a first ultrasonic transducer, selecting an array element to transmit ultrasonic waves through the center of the first blood vessel, or transmitting ultrasonic waves through multiple array elements and focusing on the center of the first blood vessel, completing the scanning of the first arterial blood vessel to obtain an ultrasonic echo signal, and obtaining the first blood vessel diameter waveform; based on a second ultrasonic transducer, selecting an array element to transmit ultrasonic waves through the center of the second blood vessel, or transmitting ultrasonic waves through multiple array elements and focusing on the center of the second blood vessel, completing the scanning of the first arterial blood vessel to obtain an ultrasonic echo signal, and obtaining the second blood vessel diameter waveform.

[0028] In a possible implementation of the first aspect above, the electronic device is a smart watch or a smart bracelet.

[0029] In a third aspect, an embodiment of the present application provides an electronic device, which includes a first ultrasonic transducer, a second ultrasonic transducer, a watchband and an airbag. The watchband of the electronic device is provided with a first space, and the airbag is located in the first space, and the first space is a hollow shape; the first ultrasonic transducer and the second ultrasonic transducer are arranged on one side of the airbag, and when the electronic device is in a state of being worn by a user, the first ultrasonic transducer and the second ultrasonic transducer are arranged between the airbag and the user's skin, and the fit between the first ultrasonic transducer and the second ultrasonic transducer and the surface of the user's skin is increased by squeezing the airbag.

[0030] Based on the above scheme, when the airbag is squeezed, the first ultrasonic transducer and the second ultrasonic transducer can be pressed at a fixed point from the hollow position. When the watchband is tightened, the air between the first ultrasonic transducer and the second ultrasonic transducer and the skin can be squeezed out by utilizing the characteristics of the protruding structure of the airbag, thereby making the first ultrasonic transducer and the second ultrasonic transducer further fit closely to the skin, so as to reduce the influence of the acoustic impedance characteristics on the sent and received ultrasonic signals, improve the quality of the sent and received ultrasonic signals, and thus improve the accuracy of the blood pressure value obtained based on the ultrasonic signal.

[0031] In a fourth aspect, an embodiment of the present application provides a blood pressure detection system, which is applied to an electronic device, and the blood pressure detection system includes a control module, an ultrasonic transducer and a data post-processing module; the control module is used to control the signal transmission and reception of the ultrasonic transducer, and control the data post-processing module to process the ultrasonic echo signal; the ultrasonic transducer is used to transmit ultrasonic waves to perform ultrasonic B-scan on the area to be detected to obtain an image of the imaging area; the data post-processing module is used to obtain the center coordinates and preliminary blood vessel diameter of the first arterial blood vessel based on the image of the imaging area; the ultrasonic transducer is used to perform ultrasonic A-scan on the first arterial blood vessel in the imaging area to obtain an ultrasonic echo signal; the data post-processing module is used to determine the blood vessel diameter waveform and pulse wave conduction velocity of the first arterial blood vessel based on the ultrasonic echo signal; the data post-processing module is used to calculate the blood pressure value based on the blood vessel diameter waveform and pulse wave conduction velocity of the first arterial blood vessel.

[0032] In a fifth aspect, the present application provides an electronic device, which includes the blood pressure detection device provided in the second aspect or the blood pressure detection system provided in the fourth aspect.

[0033] In a sixth aspect, the present application provides an electronic device, comprising a memory for storing instructions; and a processor for executing instructions so that the electronic device implements the blood pressure detection method provided in the first aspect and any possible implementation of the first aspect.

[0034] In a seventh aspect, the present application provides a readable storage medium having instructions stored thereon. When the instructions are executed, the electronic device implements the blood pressure detection method provided in the first aspect and any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 According to some embodiments of the present application, a schematic diagram of a structure for measuring blood pressure based on an electrocardiogram signal and a photoplethysmogram signal is shown;

[0036] Figure 2 According to some embodiments of the present application, a schematic diagram of a framework for obtaining blood pressure values ​​through ultrasonic B-scanning and ultrasonic A-scanning is shown;

[0037] Figure 3A According to some embodiments of the present application, a schematic diagram of an application scenario of a blood pressure detection method is shown;

[0038] Figure 3B According to some embodiments of the present application, a schematic diagram of the structure of a smart watch 200 is shown;

[0039] Figure 4 According to some embodiments of the present application, a flow chart of a blood pressure detection method is shown;

[0040] Figure 5 According to some embodiments of the present application, an imaging diagram including blood vessel locations acquired based on ultrasound B-scanning is shown;

[0041] Figure 6 According to some embodiments of the present application, a schematic diagram of a process for obtaining a blood vessel diameter based on an ultrasonic A-scan is shown;

[0042] Figure 7 According to some embodiments of the present application, a schematic structural diagram of an ultrasonic blood pressure detection system is shown;

[0043] Figure 8 According to some embodiments of the present application, a schematic diagram of the hardware structure of a smart watch 200 is shown. DETAILED DESCRIPTION

[0044] The illustrative embodiments of the present application include, but are not limited to, a blood pressure detection method, an electronic device, and a readable storage medium.

[0045] It can be understood that the blood pressure detection method provided in the embodiments of the present application can be applied to smart wearable devices such as smart watches and smart bracelets, where the smart wearable devices can also be referred to as electronic devices mentioned in the present application.

[0046] The technical solution of the present application is described below in conjunction with the accompanying drawings.

[0047] To facilitate understanding of the blood pressure detection method provided in the embodiments of the present application, the relevant terms involved in the embodiments of the present application are first introduced.

[0048] (1) Ultrasound B-scan

[0049] Ultrasonic B-scan is to display the ultrasonic signal in a certain section in a two-dimensional plane in the form of grayscale. The display result of ultrasonic B-scan is a two-dimensional image, in which the horizontal axis in the image represents the scan width (affected by the length of the transducer and the deflection angle of the transmitted sound wave), and the vertical axis represents the depth (calculated by the propagation time of the ultrasonic wave). Ultrasonic B-scan can include plane wave scanning, line scanning, etc. Among them, plane wave scanning means that all ultrasonic array elements transmit ultrasonic waves at the same time, and the entire scanning area is covered by one transmission. Then all ultrasonic array elements receive ultrasonic echo information and perform beam synthesis on the receiving side to obtain an ultrasonic image. Plane wave scanning can also be achieved by transmitting multiple ultrasonic waves at different angles and then synthesizing them to improve image quality; line scanning means that each time a position in the scan width is transmitted and received (similar to a line), a certain number of ultrasonic array elements are selected for focused transmission through a delay design, that is, transmission beam synthesis. Then a certain number of ultrasonic array elements receive echo information and perform beam synthesis on the receiving side, and the entire scanning area is covered by multiple transmissions and receptions. It can be understood that both the plane wave scanning method and the line scanning method are intended to obtain an image of the entire scanning area, and the result is a two-dimensional image.

[0050] (2) Ultrasound A-scan

[0051] Ultrasonic A-scan or ultrasonic M-scan is to obtain information of different depths at a specific width position. The display result of ultrasonic A-scan is a waveform, in which the horizontal axis of the waveform represents the depth (or time, or sound path), and the vertical axis represents the amplitude. Ultrasonic A-scan can include single-element scanning mode or multi-element scanning mode, in which single-element scanning refers to the use of only one ultrasonic element to transmit ultrasonic waves for scanning; multi-element scanning refers to multiple ultrasonic elements transmitting ultrasonic waves focused on a certain depth, that is, scanning with transmit beam synthesis. It can be understood that both single-element scanning mode and multi-element scanning mode are used to obtain information of different depths at a certain width position.

[0052] In some solutions, electrocardiogram (ECG) and photoplethysmography (PPG) signals can be collected by smart wearable devices, and then blood pressure detection can be performed through modeling based on the collected ECG and PPG. Figure 1 , Figure 1 FIG. 1 shows a schematic diagram of measuring blood pressure based on an electrocardiogram signal and a photoplethysmogram signal. Figure 1As shown, an ECG signal acquisition module, a photoelectric volumetric pulse wave signal acquisition module and a signal processing module can be set in the smart wearable device. Among them, the ECG acquisition module can acquire the ECG signal of the human body based on the ECG sensor, and the photoelectric volumetric pulse wave signal acquisition module can acquire the pulse wave signal of the human body based on the photoelectric volumetric pulse wave sensor. After acquiring the ECG signal and the pulse wave signal, they can be sent to the signal processing module for processing. The signal processing module is preset with a model that can calculate the blood pressure value based on the ECG signal and the pulse wave signal, and the blood pressure value can be measured based on the signal processing module.

[0053] However, the above-mentioned smart wearable devices mainly use photoelectric sensors to detect physiological signals such as electrocardiogram signals and pulse wave signals to detect blood pressure values. However, the relationship between electrocardiogram signals and pulse wave signals and blood pressure is not direct, and the measurement accuracy is low.

[0054] In other solutions, an inflatable cuff can be set in the smart wearable device to detect blood pressure using the same sphygmomanometer principle as the cuff pressurization method. However, the blood pressure detection method based on the cuff pressurization method cannot be performed in real time throughout the day, and has strict requirements on the user's measurement posture, which is not very convenient.

[0055] It can be understood that blood vessel diameter and pulse wave velocity are parameters that are strongly correlated with blood pressure. It can be understood that pulse wave refers to the fluctuations caused by the rhythmic intermittent ejection of blood by the heart, and pulse wave velocity (PWV) refers to the pressure wave transmission speed propagating along the arterial wall generated by each heart beat and ejection, that is, the propagation speed of the pulse wave in the artery. PWV is an indicator that can be used to evaluate arterial vascular stiffness. Among them, blood pressure values ​​include diastolic pressure and systolic pressure.

[0056] In some embodiments, two rows of parallel ultrasonic transducers may be provided on the strap of a smart wearable device (e.g., a smart bracelet, a smart watch, etc.), and the two rows of ultrasonic transducers are perpendicular to the arteries when worn. In some embodiments, the following formula (1) may be used to calculate PWV, formula (2) may be used to calculate diastolic pressure, and formula (3) may be used to calculate systolic pressure.

[0057]

[0058] In formula (1), ΔL is the distance difference of the ultrasonic transducer in the arterial direction, and Δt is the time difference between the diameter characteristic point of the same cardiac cycle on the diameter waveform on the two blood vessel diameter waveforms. On the diameter waveform of a cardiac cycle, the characteristic point can be a trough, a peak, a first-order derivative maximum value on the trough to peak segment, a second-order derivative maximum value or a minimum value, etc. It can be understood that two rows of parallel ultrasonic transducers can obtain blood vessel diameter waveforms at two different positions through ultrasonic A scanning. In the same cardiac cycle, the time of the same characteristic point on the two diameter waveforms is different. For example, in the same cardiac cycle, the end diastole of the two blood vessel diameter waveforms is at different times. PWV is the ratio of the distance difference ΔL between the two rows of ultrasonic transducers in the arterial direction to the time difference Δt between the diameter characteristic point on the two blood vessel diameter waveforms.

[0059]

[0060]

[0061]

[0062] In formula (2), P D represents diastolic pressure, ρ is blood density, D D , C D are the vascular diameter and PWV at point D at the end of diastole, respectively; β is the vascular stiffness coefficient, which can be calculated using formula (4).

[0063] In formula (3), P S represents systolic blood pressure, P D represents diastolic pressure, β is the vascular stiffness coefficient, which can be calculated by formula (4). In formula (3), D D is the vessel diameter at point D at the end of diastole, D S is the blood vessel diameter corresponding to the systolic pressure feature point.

[0064] In formula (4), They are The diameter and PWV at the point, The point can be a trough, a peak, the maximum value of the first-order derivative on the segment from the trough to the peak, the maximum or minimum value of the second-order derivative, etc. D , C D They are the diameter and PWV at point D at the end of diastole. It is worth noting that the above characteristic points must be within the same cardiac cycle.

[0065] Therefore, in order to solve the above problems, a blood pressure detection method is provided in an embodiment of the present application. An imaging diagram including the location of the blood vessel can be first obtained by ultrasonic B scanning, and the location of the blood vessel, the center coordinates of the blood vessel and the preliminary blood vessel diameter can be determined by the imaging diagram; ultrasonic A scanning is further used to transmit ultrasonic waves to the location of the blood vessel and obtain the reflected ultrasonic echo signal, and the blood vessel diameter is obtained based on the reflected ultrasonic echo signal, and the pulse wave conduction velocity is calculated based on the blood vessel diameter waveform at two different positions on the blood vessel. Finally, the blood pressure value can be calculated by the blood vessel diameter and the pulse wave conduction velocity.

[0066] Based on the above solution, smart wearable devices can be used to monitor the user's blood pressure.

[0067] In some embodiments, in order to obtain the blood vessel diameter, an ultrasonic wave may be emitted to the location of the blood vessel through an ultrasonic A scan and the reflected ultrasonic echo signal may be obtained, and a peak detection may be performed to obtain multiple peak points, and then the preliminary blood vessel front and back wall positions are determined based on the center coordinates of the blood vessel and the preliminary blood vessel diameter, and then the region of interest of the blood vessel front and back wall is determined based on the preliminary blood vessel front and back wall positions, and the peak point in the region of interest of the blood vessel front and back wall that is closer to the center coordinate is used as the blood vessel front and back wall position, and then the blood vessel diameter may be determined based on the blood vessel front and back wall position. The region of interest of the blood vessel front and back wall refers to the range of change of the blood vessel front and back wall, and the region of interest of the blood vessel front and back wall may be determined based on the preliminary blood vessel front and back wall position, the blood vessel diameter change rate, and the preliminary blood vessel diameter.

[0068] In some embodiments, in order to obtain the pulse wave velocity, two rows of ultrasonic transducers can be used to obtain blood vessel diameter waveforms at two different positions, and then the pulse wave velocity is determined based on the distance ΔL between ultrasonic transducer 1 and ultrasonic transducer 2 along the blood vessel direction and the time difference Δt between the characteristic points in the same cardiac cycle on the two blood vessel diameter waveforms. That is, PWV is obtained by the above formula (1).

[0069] Figure 2 FIG. 2 shows a schematic diagram of a framework for obtaining blood pressure values ​​by using ultrasound B scanning and ultrasound A scanning. Figure 2 As shown, first, an ultrasound B scan is performed, that is, plane wave imaging or line scan imaging is used to obtain an image including blood vessels, so as to determine the position of the arterial blood vessels based on the obtained image including blood vessels. Then, based on the blood vessel position, an ultrasound A scan is performed, that is, a single array element or multiple array elements are used to focus on the blood vessel position for scanning, so as to obtain the blood vessel diameter and PWV based on the results of the ultrasound A scan. Finally, the blood pressure value can be calculated based on the obtained blood vessel diameter and PWV through logical modeling or big data learning algorithm.

[0070] It is understood that the blood vessel diameter waveform can be obtained through ultrasonic A scanning, PWV can be obtained based on the blood vessel diameter waveform, and then a deep learning model can be established based on the blood vessel diameter waveform or the blood vessel diameter waveform and PWV to obtain a corresponding relationship with blood pressure. Blood pressure can also be calculated based on the blood vessel diameter waveform and PWV using the Hayashi model and the Bramwell-Hill model, which are not limited here.

[0071] In an embodiment of the present application, the blood pressure value of the arterial blood vessels at the human wrist can be measured by a device such as a smart watch. The wrist artery is a blood vessel that can be used for blood pressure detection.

[0072] In an embodiment of the present application, an ultrasonic transducer can be set in a smart wearable device, wherein the ultrasonic transducer refers to a device that can convert electrical energy into ultrasonic energy and also convert ultrasonic energy into electrical energy. Through the ultrasonic transducer, ultrasonic technology can be used to detect blood vessel diameter and PWV.

[0073] For example, Figure 3A An application scenario diagram of a blood pressure detection method provided in an embodiment of the present application is shown, wherein: Figure 3A In the description, the smart wearable device is a smart watch 200 as an example. In some embodiments, two rows of ultrasonic transducers 1 and 2 placed in parallel can be set on the strap of the smart watch 200. The ultrasonic transducers 1 and 2 are placed perpendicular to the direction of the blood vessels to achieve ultrasonic scanning of two positions on the user's wrist based on the ultrasonic transducers 1 and 2. A plurality of ultrasonic array elements are set in the ultrasonic transducer 1 and the ultrasonic transducer 2. The ultrasonic array elements can be used to transmit ultrasonic signals and receive ultrasonic echo signals, and then the two ultrasonic transducers can obtain an imaging map including arterial blood vessels based on the ultrasonic B scan, and determine the blood vessel position based on the imaging map, and then the two ultrasonic transducers can obtain two blood vessel diameter waveforms based on the ultrasonic A scan, and obtain PWV based on the two blood vessel diameter waveforms, and then calculate the blood pressure value based on the blood vessel diameter waveform and the PWV obtained based on the blood vessel diameter waveform.

[0074] It is understandable that Figure 3AAs shown, the ultrasonic transducers are arranged in a double-row multi-section manner, the ultrasonic transducers 1 and 2 are parallel to each other, and the ultrasonic transducers 1 and 2 are perpendicular to the arterial blood vessels, respectively, wherein the ultrasonic transducers 1 and 2 both include multiple sections, and each section of the ultrasonic transducers 1 and 2 is arranged at intervals, and each section of the ultrasonic transducers 1 and 2 is composed of multiple ultrasonic array elements. It can be understood that the distance between the ultrasonic transducers 1 and 2 along the blood vessel direction needs to be less than the first distance threshold, wherein the distance between the ultrasonic transducers 1 and 2 along the blood vessel direction refers to the distance between the center of the ultrasonic transducer 1 and the center of the ultrasonic transducer 2. In addition, the array element distance of the ultrasonic transducers 1 and 2 needs to be less than the first array element distance threshold, wherein the array element distance refers to the distance between the array element centers of any two ultrasonic array elements in each section of the ultrasonic transducers 1 and 2. In addition, the array element gap between any two ultrasonic array elements in each section of the ultrasonic transducer 1 and the ultrasonic transducer 2 needs to be smaller than the first array element gap threshold; the pitch between each section of the ultrasonic transducer 1 and the ultrasonic transducer 2 is smaller than the first pitch threshold.

[0075] It can be understood that the double-row design is to set the ultrasonic transducer 1 and the ultrasonic transducer 2 at two different positions on the user's wrist, so that measurements can be performed at different positions on the user's wrist to obtain two blood vessel diameter waveforms, and then the PWV can be calculated based on the two blood vessel diameter waveforms using the above formula (1). The multi-section design is to ensure the flexibility of the strap of the smart watch 200. For each row of transducers, in order to ensure better ultrasonic signal quality, imaging resolution and contrast, etc., the size of the array element spacing in each row of transducers must be less than 300μm, wherein the size of the array element gap must be less than 30μm. In addition, because the ultrasonic transducer will be harder when the array element gap is at this size level, the multi-section design can ensure the flexibility of the overall strap of the smart watch 200 when the ultrasonic transducer is locally harder. For two rows of ultrasonic transducers, the pulse wave of the arterial blood vessel is transmitted from the arterial blood vessel position corresponding to one row of ultrasonic transducers to the arterial blood vessel position corresponding to the other row of ultrasonic transducers. The pulse repetition frequency (PRF) of the two rows of transducers scanning will be limited by the distance (D) between the centers of the two rows of ultrasonic transducers. Since PWV is generally 5m / s, D×PRF≥5 needs to be satisfied to avoid aliasing in the imaging image.

[0076] It is understandable that when the ultrasonic transducer emits ultrasonic waves to scan the surface of human skin, due to the gap between the ultrasonic transducer and the human body, the acoustic impedance characteristics between the ultrasonic transducer probe and the air, and between the air and the skin soft tissue are very different, that is, the acoustic impedance does not match. If the ultrasonic probe is used directly to scan the skin surface, the effective sound energy of the ultrasonic wave will be very low, and the quality of the ultrasonic signal will be poor. General ultrasonic scanning eliminates the air between the probe and the skin by adding a coupling agent between the human skin surface and the probe, but as a long-term wearable device, the method of adding a coupling agent is not applicable to smart watches.

[0077] Therefore, the embodiment of the present application provides a smart watch 200 with an airbag and an ultrasonic sensor strap structure. The structural diagram is as follows: Figure 3B As shown, the smart watch 200 includes a dial, a strap and an ultrasonic transducer. The airbag is located inside the strap to fit the skin; the strap is provided with a space to store the airbag, the space is a hollow shape, and the distribution and size of the space match the distribution and size of the ultrasonic transducer, the airbag is connected to the ultrasonic transducer at the hollow position of the space, and when the airbag is squeezed, the ultrasonic transducer can be pressed at a fixed point from the hollow position. When the strap is tightened, the air between the ultrasonic transducer and the skin can be squeezed out by utilizing the characteristics of the protruding structure of the airbag, thereby making the transducer fit more closely to the skin, so as to reduce the influence of acoustic impedance mismatch on the ultrasonic signal.

[0078] It can be understood that the airbag can be a fixed volume shape that is easy to position and squeeze, or it can be combined with a micro air pump structure to achieve a structure with adjustable volume and pressure, which is not limited here.

[0079] In order to further understand the blood pressure detection method provided in the embodiment of the present application, Figure 4 A schematic diagram of a blood pressure detection method is shown. The blood pressure detection method can be applied to a smart watch 200 or other smart wearable devices. Figure 4 As shown, the specific process of the blood pressure detection method includes:

[0080] S101: Detect the position of the blood vessel based on the ultrasonic B-scan, and obtain the center coordinates and preliminary blood vessel diameter of the blood vessel.

[0081] In some embodiments, in order to obtain parameters such as blood vessel diameter, it is necessary to first find the location of the artery, so the location of the blood vessel can be found through ultrasonic B-scanning. The location of the blood vessel can be found based on the principle of ultrasonic Doppler imaging, that is, the ultrasonic array elements in each row of ultrasonic transducers transmit ultrasonic signals to the user's wrist, and receive ultrasonic echo signals reflected by the ultrasonic signals, thereby obtaining an imaging map of the entire imaging area of ​​the user's wrist, wherein the imaging map includes a blood flow portion, and the blood flow portion corresponds to the blood vessel position, thereby realizing the location of the blood vessel.

[0082] It can be understood that ultrasonic Doppler imaging refers to an imaging method that sends out ultrasonic signals of a certain frequency, obtains ultrasonic echo signals of the sent ultrasonic signals within a specific time, calculates physical quantities such as blood velocity based on the reflected ultrasonic echo signals, and then displays an imaging image on a display. Among them, the imaging image can realize the extraction and development of blood flow, and the blood flow information in the imaging image is obvious, and the location of the blood vessel can be determined based on the blood flow information.

[0083] It can be understood that the imaging image based on the ultrasonic echo signal is obtained by beamforming the ultrasonic echo signal to obtain the ultrasonic radio frequency data s, and then the Doppler velocity v can be demodulated using the Doppler formula (5); or the power Doppler formula (6) can be used to calculate the power P, which can be obtained by cross-correlation based on the Wiener-Khinchin theorem. Furthermore, the imaging image can be displayed on the display based on physical quantities such as the Doppler velocity v or the power P.

[0084]

[0085]

[0086] In formula (5), c is the propagation speed of ultrasound, PRF is the pulse repetition frequency, and f 0 is the center frequency of the transmitted ultrasonic signal, lag is the number of frames corresponding to the delay applied in Doppler calculation, Δθ lag is the average phase difference between the ultrasonic radio frequency data s and the delayed s(i+lag).

[0087] In formula (6), N is the number of image frames used for power Doppler calculation.

[0088] Figure 5 FIG. 1 shows an image obtained by ultrasound B-scan including the location of blood vessels. Figure 5 In the figure, the horizontal axis represents the horizontal position of the ultrasound B scan, and the vertical axis represents the imaging depth. It can be seen that the imaging image shows the blood flow part. Based on the blood flow part, the location of the blood vessel can be determined. Based on the blood vessel location, the center coordinates (x, y) of the arterial blood vessel and a preliminary blood vessel diameter measurement value D can be obtained. pre .

[0089] It can be understood that the Wiener-Khinchin theorem means that the power spectral density of any wide-sense stationary random process with a constant mean is the Fourier transform of its autocorrelation function.

[0090] It can be understood that the pulse repetition frequency (PRF) is the number of transmission pulses generated per second, that is, the reciprocal of the ultrasonic pulse repetition interval, and the ultrasonic pulse repetition interval is the time interval between the current ultrasonic pulse and the next ultrasonic pulse.

[0091] In some embodiments, a first ultrasonic transducer, i.e., ultrasonic transducer 1, can be used to acquire an image of a first imaging area of ​​a first arterial blood vessel in the area to be detected based on an ultrasonic B-scan, and a second ultrasonic transducer, i.e., ultrasonic transducer 2, can be used to acquire an image of a second imaging area of ​​the first arterial blood vessel in the area to be detected based on an ultrasonic B-scan.

[0092] S102: Scan the blood vessel position by ultrasonic A-scan to obtain the blood vessel diameter.

[0093] In some embodiments, after the location of the blood vessel is determined by ultrasonic B scanning, the blood vessel diameter waveform can be obtained by ultrasonic A scanning, and the blood vessel diameter can be obtained by the blood vessel diameter waveform. It can be understood that the ultrasonic A scanning, or ultrasonic M scanning, can include a single-element scanning method or a multi-element scanning method. Each time the ultrasonic A scanning transmits an ultrasonic signal, only a one-dimensional ultrasonic echo signal is obtained, reflecting the information of different depths at a lateral position. Among them, the single-element scanning refers to selecting an element in the ultrasonic transducer to transmit an ultrasonic signal to the blood vessel position, and the ultrasonic signal passes through the center of the blood vessel; the multi-element scanning refers to focusing and transmitting ultrasonic signals to the blood vessel position through multiple elements in the ultrasonic transducer. It can be understood that the blood vessel diameter waveform can be obtained based on the one-dimensional ultrasonic echo signal reflected by multiple ultrasonic A scanning, wherein the horizontal coordinate of the blood vessel diameter waveform can represent time, and the vertical coordinate of the blood vessel diameter waveform can represent the absolute value of the blood vessel diameter.

[0094] In some embodiments, the ultrasonic transducer 1 can scan the blood vessel position in the first imaging area obtained by the ultrasonic transducer 1 based on the ultrasonic B scan based on the ultrasonic A scan to obtain a first blood vessel diameter waveform of the arterial blood vessel, and the ultrasonic transducer 2 can scan the blood vessel position in the second imaging area obtained by the ultrasonic transducer 2 based on the ultrasonic B scan based on the ultrasonic A scan to obtain a second blood vessel diameter waveform of the first arterial blood vessel.

[0095] For example, Figure 6 A schematic diagram of a process for obtaining blood vessel diameter based on ultrasonic A-scan is shown.

[0096] Specifically, based on the abscissa x of the center coordinates (x, y) of the blood vessel obtained above, the above Figure 5The ultrasound A-scan is used to scan the blood vessels in the image. The ultrasound signal emitted by the ultrasound A-scan passes through the center of the blood vessel. The ultrasound echo signal obtained by the ultrasound A-scan is then beamformed and envelope detected, smoothed, and normalized to obtain the processed ultrasound echo signal, i.e., the ultrasound A-scan signal.

[0097] Further, the positions of the front and back walls of the blood vessel are determined. First, the peak value of the processed ultrasonic echo signal is detected to obtain a series of peak points. Because the blood vessel wall is a strong reflection interface, the blood vessel boundary, i.e., the front and back walls of the blood vessel, must be located at these peak points. Then, the region of interest (ROI) of the front and back walls of the blood vessel is determined. The ROI is divided into the front wall ROI and the back wall ROI, which respectively contain the pulsation range of the front and back walls of the blood vessel. The y coordinate of the center of the blood vessel in the ultrasonic B-scan result and the preliminary blood vessel diameter measurement value D pre , determine the initial anterior and posterior wall positions of the blood vessel, and the range of ROI can be the initial anterior and posterior wall positions of the blood vessel ± VarRatio * PreDiameter, where VarRatio refers to the change rate of the blood vessel diameter, and PreDiameter refers to the initial blood vessel diameter measurement value, that is, the above D pre . During the calculation process, the ROI can be updated based on the preliminary front and back wall positions obtained from the previous ultrasound A-scan. Find the peak point closer to the center coordinates of the blood vessel within the ROI, and regard it as the position of the front and back walls of the blood vessel. Finally, the blood vessel diameter is calculated based on the positions of the front and back walls of the blood vessel. For example, the position of the anterior wall of the blood vessel is 1mm, and the position of the posterior wall of the blood vessel is 2.6mm, so the blood vessel diameter can be obtained as 1.6mm. It can be understood that the blood vessel diameter detected at different times can represent the changes in the blood vessel diameter during the cardiac cycle. Each ultrasound A-scan can obtain a blood vessel diameter result. The ultrasound A-scan is performed at a pulse repetition frequency PRF, and a blood vessel diameter waveform with a sampling rate of 1 / PRF can be obtained.

[0098] In some embodiments, the ultrasonic transducer 1 can transmit ultrasonic waves through the first blood vessel center of the arterial blood vessel by ultrasonic A-scanning, scan the arterial blood vessel, obtain ultrasonic echoes, obtain first peak points and second peak points in the ultrasonic echoes, and obtain the first blood vessel front and back wall positions of the arterial blood vessel based on the first peak points and the second peak points, and then obtain the first blood vessel diameter of the arterial blood vessel based on the first blood vessel front and back wall positions, wherein the ultrasonic A-scan is repeated to obtain the first blood vessel diameter waveform of the arterial blood vessel.

[0099] It can be understood that in some embodiments, the acquisition of the first peak point and the second peak point can be performed by scanning the first imaging area by the ultrasonic transducer 1 in an ultrasonic A-scan manner to acquire the first ultrasonic echo signal, and performing envelope detection, smoothing, and normalization processing on the first ultrasonic echo signal to acquire the second ultrasonic echo signal, and then based on the second ultrasonic echo signal, the second ultrasonic echo signal can be peak detected to acquire the first peak point and the second peak point. The first peak point can be a point in the region of interest of the anterior wall of the first blood vessel whose distance from the coordinates of the center of the first blood vessel is less than the third distance threshold, and the second peak point can be a point in the region of interest of the posterior wall of the first blood vessel whose distance from the center of the first blood vessel is less than the fourth distance threshold.

[0100] In some embodiments, the ultrasonic transducer 2 can transmit ultrasonic waves through the center of the second blood vessel of the arterial blood vessel by ultrasonic A-scanning, scan the arterial blood vessel, obtain ultrasonic echoes, obtain the third peak point and the fourth peak point in the ultrasonic echoes, and obtain the front and back wall positions of the second blood vessel of the arterial blood vessel based on the third peak point and the fourth peak point, and then obtain the second blood vessel diameter of the arterial blood vessel based on the front and back wall positions of the second blood vessel, wherein the ultrasonic A-scan is repeated to obtain the second blood vessel diameter waveform of the arterial blood vessel.

[0101] It can be understood that in some embodiments, the acquisition of the third peak point and the fourth peak point can be performed by scanning the second imaging area by the ultrasonic transducer 2 in an ultrasonic A-scan manner to acquire a third ultrasonic echo signal, and performing envelope detection, smoothing, and normalization processing on the third ultrasonic echo signal to acquire a fourth ultrasonic echo signal, and then performing peak detection on the fourth ultrasonic echo signal to acquire the third peak point and the fourth peak point. The third peak point can be a point in the region of interest of the anterior wall of the first blood vessel whose distance from the coordinates of the center of the first blood vessel is less than a fifth distance threshold, and the fourth peak point can be a point in the region of interest of the posterior wall of the first blood vessel whose distance from the center of the first blood vessel is less than a sixth distance threshold.

[0102] S103: Acquire two blood vessel diameter waveforms based on two rows of ultrasonic transducers, and acquire pulse wave conduction velocity based on the two blood vessel diameter waveforms.

[0103] In some embodiments, after obtaining the blood vessel diameter based on the above steps, in order to obtain the final blood pressure value, it is also necessary to calculate the pulse wave velocity. In order to obtain the pulse wave velocity, two rows of ultrasonic transducers can detect diameter waveforms at two different positions on the arterial blood vessel. It can be understood that the blood vessel diameter waveform is obtained based on repeated scanning of the blood vessel position by ultrasonic A scanning. After obtaining two blood vessel diameter waveforms, the time of taking the same characteristic point in the same cardiac cycle on the two diameter waveforms is different. For example, in the same cardiac cycle, the end diastole of the two blood vessel diameter waveforms is at different times, and then the pulse wave velocity PWV can be calculated based on the two blood vessel waveforms using the above formula (1).

[0104] S104: Calculate the blood pressure value based on the blood vessel diameter and pulse wave velocity.

[0105] In some embodiments, after obtaining the blood vessel diameter and pulse wave velocity, the blood pressure value can be calculated based on the Hayashi model and the Bramwell-Hill model. Based on the Hayashi model and the Bramwell-Hill model, formulas (2), (3), and (4) can be derived, and then the stiffness coefficient is calculated based on formula (4), and then the systolic pressure and diastolic pressure are calculated based on formulas (2) and (3).

[0106] Specifically, we first use two diameter feature points on the two blood vessel diameter waveforms Point A and point D, The point can be a trough, a peak, the maximum value of the first-order derivative on the segment from the trough to the peak, the maximum or minimum value of the second-order derivative, etc. Point D is the end-diastolic point. The blood vessel diameter at point A and point D, the pulse wave velocity and the blood vessel stiffness coefficient β can be used to calculate the diastolic pressure P respectively based on the blood vessel stiffness coefficient β. D and systolic blood pressure P S , where diastolic pressure P D The systolic pressure P can be calculated based on the above formula (2). S The calculation can be performed based on the above formula (3).

[0107] It is understood that in addition to calculating the blood pressure value by the above logic algorithm, a deep learning model can be directly established based on the measured blood vessel diameter to solve the blood pressure value using big data methods. Alternatively, a deep learning model can be established to solve the blood pressure value by further integrating the blood vessel diameter with one or more parameters such as PWV, PPG, ECG, blood flow velocity, and pressure.

[0108] It can be understood that in some embodiments, after the pulse wave conduction velocity is obtained based on the first blood vessel diameter waveform and the second blood vessel diameter waveform through the Hayashi model and the Bramwell-Hill model, the blood pressure value can be calculated based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave conduction velocity.

[0109] It can be understood that in some embodiments, the blood pressure value can be obtained based on the deep learning model by using the first blood vessel diameter waveform and pulse wave conduction velocity or the second blood vessel diameter waveform and pulse wave conduction velocity or the average of the first blood vessel diameter waveform and the second blood vessel diameter waveform and the pulse wave conduction velocity; in other embodiments, the blood pressure value can be calculated based on the deep learning model by using the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average of the first blood vessel diameter waveform and the second blood vessel diameter waveform, which is not limited here.

[0110] In some embodiments, the blood pressure detection method provided in the present application can be based on an ultrasonic blood pressure detection system for detection.

[0111] For example, Figure 7 The schematic diagram of the structure of an ultrasonic blood pressure detection system is shown. The ultrasonic blood pressure detection system can be divided into a hardware part, a software part and a communication module.

[0112] The hardware part may include a signal generation module, a delay module, a gating control module, an ultrasonic transducer and an echo receiving module. Among them, the signal generation module can be used to generate a pulse excitation signal; the delay module can be used to set different delays for each ultrasonic signal to achieve focusing or plane wave tilt transmission; the gating control module can be used to control the connection between the transmitting circuit and different ultrasonic array elements in the ultrasonic transducer, and the gating control module can be a one-to-many mode, that is, to achieve the function of one transmitting circuit controlling multiple ultrasonic array elements; the ultrasonic transducer can be used to transmit ultrasonic signals and receive ultrasonic echo signals; the echo processing module has built-in filtering circuits, gain adjustment circuits, analog-to-digital conversion components, etc., and the echo processing module can be used to perform denoising, amplification and sampling on ultrasonic echo signals.

[0113] The software part may include an instruction module, a data post-processing module and a display module. Among them, the instruction module can be used to send data processing instructions to the data post-processing module, such as relevant calculation instructions for determining the position of blood vessels based on the ultrasonic echo signal of the ultrasonic B scan. The instruction module can also send instructions for performing ultrasonic B scan and ultrasonic A scan to the hardware part through the communication module; the data post-processing module can send the display data corresponding to the imaging image to the display module after processing based on the results of the ultrasonic B scan, and can complete the calculation of the blood vessel diameter, PWV and blood pressure value based on the results of the ultrasonic A scan, and send the results to the display module for display. It can be understood that the blood pressure detection method provided in the present application can perform the blood pressure detection process based on the above-mentioned ultrasonic blood pressure detection system or other systems that can detect blood pressure values ​​based on ultrasonic B scan and ultrasonic A scan, which is not limited here, and the entire detection process can be repeated at a certain frequency to achieve real-time detection of blood pressure. It can be understood that the instructions and calculation results of the software part can control the hardware part to complete the corresponding ultrasonic signal acquisition.

[0114] The communication module can be used to transmit instructions and data between the software part and the hardware part, and can adopt a wired method or a wireless method, such as Bluetooth, WIFI (WIreless Fidelity), etc., which is not limited here.

[0115] Based on the blood pressure detection method provided in the embodiment of the present application, the user's blood pressure can be accurately detected in real time.

[0116] In other embodiments, in the calculation of blood pressure values, other physiological signals such as electrocardiogram (ECG) and photoplethysmogram (PPG), blood flow velocity, and pressure and other parameters may be added as inputs to calculate the blood pressure values ​​based on the blood vessel diameter and PWV, without limitation herein.

[0117] In other embodiments, the ultrasonic transducer may be designed with other structures and a scanning scheme of first performing an ultrasonic B scan and then an ultrasonic A scan may be used to detect the blood vessel diameter. The structural design of the ultrasonic transducer is not limited herein.

[0118] In other embodiments, some modules may be added or reduced in the hardware design of the ultrasonic blood pressure detection system, which is not limited here.

[0119] It can be understood that the electronic device provided in the embodiment of the present application can be a smart watch, a smart bracelet, or other smart wearable device that can be used to monitor the user's blood pressure, and is not limited here.

[0120] further, Figure 8 According to some embodiments of the present application, a schematic diagram of the hardware structure of a smart watch 200 is shown.

[0121] like Figure 8 As shown, the smart watch 200 includes: a processor 201, a micro control unit 202, a memory 203, a display screen 204, a communication module 205, a sensor module 206, an interface module 207, a button 208, a power module 209, etc.

[0122] The processor 201 may include one or more processing units, for example, a processing module or processing circuit including a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processor (DSP), an artificial intelligence (AI) processor, or a programmable logic device (field programmable gate array, FPGA). Different processing units may be independent devices or integrated into one or more processors. In some embodiments, the processor 201 may be used to execute the blood pressure detection method provided in the embodiments of the present application.

[0123] The memory 203 may include random-access memory (RAM), volatile memory such as double data rate synchronous dynamic random access memory (DDR SDRAM), and non-volatile memory such as programmable read-only memory (PROM), electrically alterable read-only memory (EAROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, secure digital memory card (SD), etc. The memory 203 can be used to store instructions and data. For example, in some embodiments, the memory 203 can be used to store instructions for implementing the blood pressure monitoring method provided in each embodiment of the present application and data of related ultrasonic signals.

[0124] The display screen 204 is used to display images, videos, etc., such as desktops and GUIs of various applications. The display screen 204 includes a display panel, and the display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), Mini-LED, Micro-LED, Micro-OLED, quantum dot light emitting diodes (QLED), etc. For example, in some embodiments, the result of the blood pressure value obtained by the blood pressure detection method provided in the embodiments of the present application can be displayed on the display screen 204.

[0125] The communication module 205 may include a mobile communication module and a wireless communication module. In some embodiments, the communication module 205 may be used to communicate instructions between the hardware part and the software part in the ultrasonic blood pressure monitoring system.

[0126] Among them, the mobile communication module can provide wireless communication solutions including 2G / 3G / 4G / 5G applied to the smart watch 200. The mobile communication module may include at least one filter, a switch, a power amplifier and a low noise amplifier (LNA). The mobile communication module can receive electromagnetic waves through the antenna, filter, amplify and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module can also amplify the signal modulated by the modulation and demodulation processor and convert it into electromagnetic waves for radiation through the antenna.

[0127] The wireless communication module can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), NFC, infrared technology (IR), etc., which are applied to the smart watch 200. The wireless communication module can be one or more devices integrating at least one communication processing module. The wireless communication module receives electromagnetic waves via an antenna, modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 201. The wireless communication module can also receive the signal to be sent from the processor 201, modulate the frequency, amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0128] The sensor module 206 may include a sensor for monitoring the state of the smart watch 200 or the state of wearing the smart watch 200. In some embodiments, the sensor module 206 may include: an ultrasonic transducer for transmitting and receiving ultrasonic signals; a temperature sensor for detecting the ambient temperature of the environment in which the smart watch 200 is located or the body temperature of the user wearing the smart watch 200; a blood oxygen sensor for detecting the blood oxygen of the user wearing the smart watch 200; a heart rate sensor for detecting the heart rate of the user wearing the smart watch 200; an acceleration sensor for detecting the magnitude of acceleration in various directions (generally three axes), for detecting the posture of the smart watch 200, or detecting the motion data of the user wearing the smart watch 200, etc.

[0129] The interface module 207 may include a physical interface for connecting the smart watch 200 to other devices. For example, the interface module 207 may include an interface for connecting an external memory card (e.g., an SD card interface for connecting a Micro SD card, a SIM card interface for connecting a subscriber identity module (SIM) card, a universal serial bus (USB) interface for connecting other devices, etc.).

[0130] The button 208 may include a crown, a dial, etc., and is used to send a signal to the processor 201 to trigger a corresponding function when a user operates the button 208. For example, when the processor 201 detects that the user presses the crown or the dial, it can wake up the smart watch 200 or switch to the desktop.

[0131] The power module 207 may include a battery, and the power module 207 may be used to charge the battery or to supply power to the processor 201 , the microcontroller unit 202 , the memory 203 , the display screen 204 , the communication module 205 , the sensor module 206 , the interface module 207 , and the button 208 .

[0132] Understandably, Figure 8 The structure of the smart watch 200 shown does not constitute a specific limitation on the smart watch 200. In other embodiments of the present application, the smart watch 200 may include more or fewer components than shown, 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.

[0133] It can be understood that the operating system of the smart watch 200 can be any operating system, including but not limited to Android™, Hongmeng™, iOS™, and Wear OS™, and is not limited here.

[0134] The various embodiments disclosed in the present application may be implemented in hardware, software, firmware, or a combination of these implementation methods. The embodiments of the present application may be implemented as a computer program or program code executed on a programmable system, the programmable system including at least one processor, a storage system (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device.

[0135] Program code can be applied to input instructions to perform the functions described in this application and generate output information. The output information can be applied to one or more output devices in a known manner. For the purposes of this application, a processing system includes any system having a processor such as, for example, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), or a microprocessor.

[0136] Program code can be implemented with high-level programming language or object-oriented programming language to communicate with the processing system. When necessary, program code can also be implemented with assembly language or machine language. In fact, the mechanism described in this application is not limited to the scope of any specific programming language. In either case, the language can be a compiled language or an interpreted language.

[0137] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may be implemented as instructions carried or stored on one or more temporary or non-temporary machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors. For example, instructions may be distributed over a network or through other computer-readable media. Therefore, machine-readable media may include any mechanism for storing or transmitting information in a machine (e.g., computer) readable form, including, but not limited to, floppy disks, optical disks, optical disks, read-only memories (CD-ROMs), magneto-optical disks, read-only memories (ROMs), random access memories (RAMs), erasable programmable read-only memories (EPROMs), electrically erasable programmable read-only memories (EEPROMs), magnetic or optical cards, flash memory, or a tangible machine-readable memory for transmitting information (e.g., carrier waves, infrared signals, digital signals, etc.) using the Internet in electrical, optical, acoustic, or other forms of propagation signals. Therefore, machine-readable media include any type of machine-readable media suitable for storing or transmitting electronic instructions or information in a machine (e.g., computer) readable form.

[0138] In the accompanying drawings, some structural or method features are shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be required. Instead, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the illustrative drawings. In addition, the inclusion of structural or method features in a particular figure does not mean that such features are required in all embodiments, and in some embodiments, these features may not be included or may be combined with other features.

[0139] It should be noted that the units / modules mentioned in the various device embodiments of the present application are all logical units / modules. Physically, a logical unit / module can be a physical unit / module, or a part of a physical unit / module, or can be implemented as a combination of multiple physical units / modules. The physical implementation method of these logical units / modules themselves is not the most important. The combination of functions implemented by these logical units / modules is the key to solving the technical problems proposed by the present application. In addition, in order to highlight the innovative part of the present application, the above-mentioned device embodiments of the present application do not introduce units / modules that are not closely related to solving the technical problems proposed by the present application, which does not mean that there are no other units / modules in the above-mentioned device embodiments.

[0140] It should be noted that in the examples and description of this patent, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. Although the present application has been illustrated and described with reference to certain preferred embodiments of the present application, it should be understood by those skilled in the art that various changes can be made to it in form and detail without departing from the scope of the present application.

Claims

1. A blood pressure detection method, applied to electronic equipment, characterized in that: The method comprises: Based on the ultrasonic B-scan, an image of a first imaging region and an image of a second imaging region of a first arterial blood vessel in the area to be detected are acquired; Based on the ultrasound A scan, acquiring a first blood vessel diameter waveform of the first arterial blood vessel in the first imaging area, and acquiring a second blood vessel diameter waveform of the first arterial blood vessel in the second imaging area; acquiring pulse wave velocity based on the first blood vessel diameter waveform and the second blood vessel diameter waveform; A blood pressure value is calculated based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or an average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave velocity.

2. A blood pressure detection device, characterized in that: The blood pressure detection device comprises a first ultrasonic transducer and a second ultrasonic transducer, wherein the first ultrasonic transducer and the second ultrasonic transducer are parallel to each other, and the first ultrasonic transducer and the second ultrasonic transducer are respectively perpendicular to the first artery; The first ultrasonic transducer and the second ultrasonic transducer each include a plurality of sections, each section of the first ultrasonic transducer and the second ultrasonic transducer is arranged at intervals, and each section of the first ultrasonic transducer and the second ultrasonic transducer is composed of a plurality of ultrasonic array elements; The distance between the first ultrasonic transducer and the second ultrasonic transducer along the blood vessel direction is less than a first distance threshold, where the distance is the distance between the center of the first ultrasonic transducer and the center of the second ultrasonic transducer; The array element distances of the first ultrasonic transducer and the second ultrasonic transducer are both smaller than a first array element distance threshold, wherein the array element distance refers to the distance between array element centers of any two ultrasonic array elements in each section of the first ultrasonic transducer and the second ultrasonic transducer; An array element gap between any two ultrasonic array elements in each section of the first ultrasonic transducer and the second ultrasonic transducer is smaller than a first array element gap threshold; A pitch between each section of the first ultrasonic transducer and the second ultrasonic transducer is less than a first pitch threshold.

3. The method according to claim 1, characterized in that: The electronic device comprises a first ultrasonic transducer and a second ultrasonic transducer; Based on the first blood vessel diameter waveform and the second blood vessel diameter waveform, the pulse wave velocity of the first arterial blood vessel is determined in the following manner: Wherein, PWV is the pulse wave velocity, ΔL is the distance between the first ultrasonic transducer and the second ultrasonic transducer along the blood vessel direction, and Δt is the time difference between the characteristic points in the same cardiac cycle on the first blood vessel diameter waveform and the second blood vessel diameter waveform on the two blood vessel diameter waveforms.

4. The method according to claim 3, characterized in that The step of acquiring a first blood vessel diameter waveform of a first arterial blood vessel in the first imaging area based on ultrasound A scanning includes: The first blood vessel diameter waveform is acquired by the first ultrasonic transducer based on the first imaging area by ultrasonic A scanning: The first ultrasonic transducer transmits ultrasonic waves through the first blood vessel center of the first arterial blood vessel in the ultrasonic A-scan mode, scans the first arterial blood vessel, obtains ultrasonic echoes, and acquires first peak points and second peak points in the ultrasonic echoes; Acquire the positions of the front and rear walls of the first arterial blood vessel based on the first peak point and the second peak point; Based on the positions of the front and rear walls of the first blood vessel, obtaining a first blood vessel diameter of the first arterial blood vessel; The ultrasonic A scan is repeatedly performed to obtain the first vessel diameter waveform of the first arterial vessel.

5. The method according to claim 3, characterized in that: The step of acquiring a second blood vessel diameter waveform of a first arterial blood vessel in the first imaging area based on ultrasound A scanning includes: Using a second ultrasonic transducer, based on the second imaging area, the second blood vessel diameter waveform is acquired by ultrasonic A scanning: The second ultrasonic transducer transmits ultrasonic waves through the center of the second blood vessel of the first artery through the ultrasonic A-scanning method, scans the first artery, obtains ultrasonic echoes, and acquires a third peak point and a fourth peak point in the ultrasonic echoes; Acquire the positions of the front and rear walls of the second blood vessel of the first arterial blood vessel based on the third peak point and the fourth peak point; Based on the positions of the front and rear walls of the second blood vessel, obtaining a second blood vessel diameter of the first arterial blood vessel; The ultrasonic A scan is repeatedly performed to obtain the second blood vessel diameter waveform of the first arterial blood vessel.

6. The method according to claim 4, characterized in that The first ultrasonic transducer transmits ultrasonic waves through the first blood vessel center of the first arterial blood vessel in the ultrasonic A-scan mode, scans the first arterial blood vessel, obtains ultrasonic echoes, and acquires first peak points and second peak points in the ultrasonic echoes, including: Acquiring a first ultrasonic echo signal through the first ultrasonic transducer and the first imaging area through the ultrasonic A-scan method, and performing envelope detection, smoothing, and normalization processing on the first ultrasonic echo signal to acquire a second ultrasonic echo signal; Based on the second ultrasonic echo signal, the first peak point and the second peak point are acquired.

7. The method according to claim 5, characterized in that The second ultrasonic transducer transmits ultrasonic waves through the center of the second blood vessel of the first artery in the ultrasonic A-scanning mode, scans the first artery, obtains ultrasonic echoes, and acquires the third peak point and the fourth peak point in the ultrasonic echoes, including: Acquiring a third ultrasonic echo signal through the second ultrasonic transducer and the ultrasonic A-scanning method based on the second imaging area, and performing envelope detection, smoothing, and normalization processing on the third ultrasonic echo signal to acquire a fourth ultrasonic echo signal; Based on the fourth ultrasonic echo signal, the third peak point and the fourth peak point are acquired.

8. The method according to claim 6, characterized in that The acquiring the first peak point and the second peak point based on the second ultrasonic echo signal includes: Perform peak detection on the second ultrasonic echo signal, and obtain the first peak point and the second peak point in the region of interest of the front and back walls of the first blood vessel, the first peak point being a point in the region of interest of the front wall of the first blood vessel whose distance from the coordinates of the center of the first blood vessel is less than a third distance threshold, and the second peak point being a point in the region of interest of the back wall of the first blood vessel whose distance from the center of the first blood vessel is less than a fourth distance threshold.

9. The method according to claim 7, characterized in that: The acquiring the third peak point and the fourth peak point based on the fourth ultrasonic echo signal comprises: Perform peak detection on the fourth ultrasonic echo signal, and obtain the third peak point and the fourth peak point in the region of interest of the front and back walls of the second blood vessel, the third peak point being a point in the region of interest of the front wall of the second blood vessel whose distance from the coordinates of the center of the second blood vessel is less than a fifth distance threshold, and the fourth peak point being a point in the region of interest of the back wall of the second blood vessel whose distance from the coordinates of the center of the second blood vessel is less than a sixth distance threshold.

10. The method according to claim 8, characterized in that The regions of interest of the anterior and posterior walls of the first blood vessel are determined by: Based on the image of the first imaging area of ​​the first arterial blood vessel, acquiring a first center coordinate and a first preliminary blood vessel diameter of the first arterial blood vessel; Based on the first center coordinates of the first arterial vessel and the first preliminary vessel diameter of the first arterial vessel, a first vessel front and rear wall region of interest of the first arterial vessel is determined.

11. The method according to claim 9, characterized in that The regions of interest of the anterior and posterior walls of the second blood vessel are determined by: Based on the image of the second imaging area of ​​the first arterial vessel, acquiring the second center coordinates and the second preliminary vessel diameter of the first arterial vessel; Based on the second center coordinates of the first arterial vessel and the second preliminary vessel diameter of the first arterial vessel, a second vessel front and rear wall region of interest of the first arterial vessel is determined.

12. The method according to claim 4, characterized in that The acquiring the first blood vessel diameter of the first arterial blood vessel based on the front and rear wall positions of the first blood vessel comprises: The first blood vessel front and back wall positions include a first blood vessel front wall position and a first blood vessel back wall position, the first blood vessel front wall position is determined based on the first blood vessel front wall interest region and a first peak point, and the first blood vessel back wall position is determined based on the first blood vessel back wall interest region and the second peak point; The first blood vessel diameter is determined based on the first blood vessel anterior wall position and the first blood vessel posterior wall position.

13. The method according to claim 5, characterized in that The obtaining the second blood vessel diameter of the first arterial blood vessel based on the front and rear wall positions of the second blood vessel comprises: The second blood vessel front and back wall positions include a second blood vessel front wall position and a second blood vessel back wall position, the second blood vessel front wall position is determined based on the second blood vessel front wall interest region and the third peak point, and the second blood vessel back wall position is determined based on the second blood vessel back wall interest region and the fourth peak point; The second blood vessel diameter is determined based on the second blood vessel anterior wall position and the second blood vessel posterior wall position.

14. The method according to claim 10, characterized in that Determining the first blood vessel front and back wall regions of interest of the first arterial vessel based on the first center coordinates of the first arterial vessel and the first preliminary blood vessel diameter of the first arterial vessel comprises: Determine a first preliminary blood vessel front and back wall position of the first arterial blood vessel based on the first center coordinate and the first preliminary blood vessel diameter; The first blood vessel front and back wall regions of interest are acquired based on the first preliminary blood vessel front and back wall positions, the blood vessel diameter change rate, and the first preliminary blood vessel diameter.

15. The method according to claim 11, characterized in that The determining of the second vascular front and rear wall regions of interest of the first arterial vessel based on the second center coordinates of the first arterial vessel and the second preliminary vessel diameter of the first arterial vessel comprises: Determine a second preliminary blood vessel front and back wall position of the first arterial blood vessel based on the second center coordinate and the second preliminary blood vessel diameter; The second blood vessel front and back wall regions of interest are acquired based on the second preliminary blood vessel front and back wall positions, the blood vessel diameter change rate, and the second preliminary blood vessel diameter.

16. The method according to claim 1, characterized in that The blood pressure value includes diastolic pressure and systolic pressure; The calculating of the blood pressure value based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform and the pulse wave velocity includes: The diastolic pressure and the systolic pressure are calculated based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average of the first blood vessel diameter waveform and the second blood vessel diameter waveform and the pulse wave velocity by the Hayashi model and the Bramwell-Hill model.

17. The method according to claim 1, characterized in that The method of calculating the blood pressure value based on the first blood vessel diameter waveform or the second blood vessel diameter waveform or the average of the first blood vessel diameter waveform and the second blood vessel diameter waveform and the pulse wave velocity further includes: Based on the deep learning model, the blood pressure value is obtained through the first blood vessel diameter waveform and the pulse wave velocity or the second blood vessel diameter waveform and the pulse wave velocity or the average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform, and the pulse wave velocity; Based on the deep learning model, the blood pressure value is calculated using the first blood vessel diameter waveform or the second blood vessel diameter waveform or an average value of the first blood vessel diameter waveform and the second blood vessel diameter waveform.

18. The method according to claim 1, characterized in that The method of acquiring an image of a first imaging region and an image of a second imaging region of a first arterial blood vessel in a region to be detected based on ultrasound B scanning comprises: Based on the first ultrasonic transducer, an image of the first imaging area is acquired by emitting an ultrasonic plane wave, or emitting an ultrasonic focused wave and changing a focal position to perform line scanning; Based on the second ultrasonic transducer, an image of the second imaging area is acquired by emitting an ultrasonic plane wave, or emitting an ultrasonic focused wave and changing the focal position to perform line scanning.

19. The method according to claim 1, characterized in that The obtaining of the first blood vessel diameter waveform and the second blood vessel diameter waveform based on ultrasound A scanning includes: Based on the first ultrasonic transducer, an array element is selected to transmit ultrasonic waves through the center of the first blood vessel, or multiple array elements are used to transmit ultrasonic waves focused on the center of the first blood vessel, so as to complete the scanning of the first arterial blood vessel to obtain ultrasonic echo signals and obtain the first blood vessel diameter waveform; Based on the second ultrasonic transducer, an array element is selected to transmit ultrasonic waves through the center of the second blood vessel, or multiple array elements are used to transmit ultrasonic waves focused on the center of the second blood vessel, so as to complete the scanning of the first arterial blood vessel to obtain ultrasonic echo signals and obtain the second blood vessel diameter waveform.

20. The method according to claim 1, characterized in that The electronic device is a smart watch or a smart bracelet.

21. An electronic device, characterized in that: The electronic device comprises a first ultrasonic transducer, a second ultrasonic transducer, a watchband and an airbag, the watchband of the electronic device is provided with a first space, the airbag is located in the first space, and the first space is hollow; The first ultrasonic transducer and the second ultrasonic transducer are arranged on one side of the airbag. When the electronic device is in a state of being worn by a user, the first ultrasonic transducer and the second ultrasonic transducer are arranged between the airbag and the user's skin. By squeezing the airbag, the fit between the first ultrasonic transducer and the second ultrasonic transducer and the user's skin surface is increased.

22. A blood pressure detection system, applied to electronic equipment, characterized in that: The blood pressure detection system includes a control module, an ultrasonic transducer and a data post-processing module; The control module is used to control the signal transmission and reception of the ultrasonic transducer, and control the data post-processing module to process the ultrasonic echo signal; The ultrasonic transducer is used to transmit ultrasonic waves to perform ultrasonic B scanning on the area to be detected to obtain an image of the imaging area; The data post-processing module is used to obtain the center coordinates and preliminary blood vessel diameter of the first arterial blood vessel based on the image of the imaging area; The ultrasonic transducer is used to perform an ultrasonic A scan on the first arterial blood vessel in the imaging area to obtain the ultrasonic echo signal; The data post-processing module is used to determine the blood vessel diameter waveform and pulse wave velocity of the first arterial blood vessel based on the ultrasonic echo signal; The data post-processing module is used to calculate the blood pressure value based on the blood vessel diameter waveform of the first arterial blood vessel and the pulse wave conduction velocity.

23. An electronic device, characterized in that: The electronic device includes the blood pressure detection device according to claim 2 or the blood pressure detection system according to claim 22.

24. An electronic device, characterized in that: It includes a memory for storing instructions; and a processor for executing the instructions so that the electronic device implements the blood pressure detection method described in any one of claims 1 and 3-20.

25. A readable storage medium, characterized in that: The readable medium stores instructions, which, when executed on an electronic device, enable the electronic device to execute the blood pressure detection method according to any one of claims 1 and 3-20.

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