A wristwatch device and blood pressure waveform monitoring method for blood pressure waveform monitoring

Abstract

The present disclosure provides a wristwatch device for blood pressure waveform monitoring, comprising: a watch dial comprising: a watch dial body, a pump-valve integrated module and a pressure sensor; wherein the pump-valve integrated module and the pressure sensor are arranged in the watch dial body; an air bag arranged on the watch dial, and the connection between the watch dial and the pump-valve integrated module and the pressure sensor is connected by a conduit, for measuring the blood pressure of a user; a flexible ultrasonic array arranged on the air bag, and the flexible ultrasonic array corresponds to the radial artery of the user when the wristwatch device is worn, for measuring the arterial diameter waveform of the user in real time. The present disclosure also provides a blood pressure waveform monitoring method.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of medical devices and physiological signal detection, and in particular to a wristwatch device for blood pressure waveform monitoring and a blood pressure waveform monitoring method. BACKGROUND

[0002] Cardiovascular disease, together with cancer, respiratory disease and diabetes, is one of the four major diseases that seriously endanger people's health. Arterial blood pressure is a key physiological parameter for evaluating the cardiovascular system. The arterial blood pressure waveform contains rich information about the dynamic cardiovascular state and can be used to diagnose or predict cardiovascular disease. Each protruding peak and concave trough in the arterial blood pressure waveform represents a specific heart activity. Continuous monitoring of these subtle waveform changes can provide a reliable basis for the diagnosis and prevention of cardiovascular disease.

[0003] Currently commonly used blood pressure measurement devices such as Korotkoff and oscillometric sphygmomanometers can only provide systolic and diastolic pressures intermittently and cannot achieve real-time measurement and blood pressure waveform measurement. The method based on pulse transit time (or speed) and pulse wave analysis is simple in principle, can provide systolic and diastolic pressures beat by beat, and is easy to combine with wearable devices, but the transfer function parameters need to be calibrated frequently during use, and the measurement accuracy is poor, which cannot meet the blood pressure monitoring requirements. Among the devices that can be used for non-invasive blood pressure waveform monitoring, the arterial tonometry method and the constant volume method have limitations in device volume, ease of use and comfort, and cannot be organically combined with wearable devices to achieve daily monitoring of blood pressure waveform.

[0004] Wristwatch is the most frequently used wearable health monitoring device carrier for people. With the development of technology, technologies and products have emerged that combine oscillometric sphygmomanometers with wristwatches, such as integrating airbags into watchbands to achieve blood pressure measurement of the radial artery at the wrist by wristwatch devices. However, in the current scheme, blood pressure measurement is intermittent, and only systolic and diastolic pressures can be provided, and real-time blood pressure waveform cannot be provided.

[0005] In recent years, with the development of technology, the application potential of ultrasound in blood pressure measurement has gradually attracted people's attention. The basic principle of measurement is to measure the arterial diameter waveform in real time by time-of-flight method, and then convert it to blood pressure waveform. However, in the current scheme, the ultrasonic probe and its transceiver system are mostly large in size and difficult to combine with wearable devices. Moreover, due to the different correspondence between blood pressure and arterial diameter for different people and different measurement locations, standard blood pressure equipment needs to be used for calibration when measuring each subject. SUMMARY

[0006] In view of the above problems, the wristwatch device for blood pressure waveform monitoring and the blood pressure waveform monitoring method are provided, which realizes real-time measurement of user blood pressure waveform through the organic integration of a flexible ultrasonic array and an oscillograph blood pressure measurement module, and combines an automatic calibration program.

[0007] According to the first aspect of the present disclosure, a wristwatch device for blood pressure waveform monitoring is provided, comprising: a watch dial, comprising: a watch dial body, a pump valve integrated module, and a pressure sensor; wherein the pump valve integrated module and the pressure sensor are arranged in the watch dial body; an air bag arranged on the watch dial and connected to the pump valve integrated module and the pressure sensor through a conduit at the connection of the watch dial, for measuring the blood pressure of a user; and a flexible ultrasonic array arranged on the air bag and corresponding to the radial artery of the user when the wristwatch device is worn, for real-time measurement of the arterial diameter waveform of the user.

[0008] According to an embodiment of the present disclosure, the flexible ultrasonic array comprises: a plurality of rows of ultrasonic elements, each row of ultrasonic elements comprising a plurality of ultrasonic elements, and the plurality of ultrasonic elements in different rows being arranged staggeredly; wherein the plurality of ultrasonic elements are arranged with a spacing between adjacent two ultrasonic elements.

[0009] According to an embodiment of the present disclosure, each ultrasonic element in the plurality of rows of ultrasonic elements is grounded through an electrode trace, and each ultrasonic element is individually connected to a driving circuit through an electrode trace.

[0010] According to an embodiment of the present disclosure, the watch dial further comprises: a screen, a battery, and a system circuit board; wherein the screen is used to display time and blood pressure waveform monitoring data; the battery is used to provide power supply for the wristwatch device; and the system circuit board comprises: a microprocessor, an ultrasonic high-voltage switching module, an ultrasonic transceiver module, a pump valve driving module, and a pressure measurement module; wherein, when the wristwatch device is running, the microprocessor controls the pump valve driving module to drive the pump valve integrated module to inflate the air bag, so as to press the radial artery of the user's wrist, the pressure measurement module acquires the blood pressure data of the user through the pressure sensor, and the arterial diameter waveform measured by the flexible ultrasonic array in real time is received through the ultrasonic high-voltage switching module and the ultrasonic transceiver module.

[0011] According to an embodiment of the present disclosure, the system circuit board further comprises: a key module located on one side surface of the watch dial and electrically connected to the microprocessor, for electrically controlling the wristwatch device.

[0012] According to an embodiment of the present disclosure, each ultrasonic element is square, circular, oval, or rectangular, and the distance between adjacent ultrasonic elements is 0.1-1.0 mm.

[0013] According to an embodiment of the present disclosure, further comprising: a watchband arranged on both sides of the watch dial, for facilitating the wearing of the wristwatch device.

[0014] According to a second aspect of the present disclosure, a blood pressure waveform monitoring method is provided, which is implemented based on the wristwatch device for blood pressure waveform monitoring provided in the first aspect of the present disclosure, and includes: inflating a gas bag to compress a radial artery of a user, measuring systolic blood pressure SBP and diastolic blood pressure DBP of the radial artery, and deflating the gas bag; traversing a flexible ultrasound array to determine a target ultrasound element, and causing the target ultrasound element to emit an ultrasound pulse; receiving an ultrasound echo from the target ultrasound element, and performing signal processing analysis on the ultrasound echo in a preset period to obtain a diameter waveform value in the preset period; and obtaining a blood pressure waveform of the user according to the diameter waveform value, the systolic blood pressure, and the diastolic blood pressure.

[0015] According to an embodiment of the present disclosure, the traversing of the flexible ultrasound array to determine the target ultrasound element includes: traversing each ultrasound element in the flexible ultrasound array, and selecting an ultrasound element with the best signal quality and the largest change in artery diameter in the flexible ultrasound array as the target ultrasound element.

[0016] According to an embodiment of the present disclosure, the method further includes: during the measurement, if it is detected that the artery echo signal received by the target ultrasound element is weakened or the artery echo quality is deteriorated, re-traversing the flexible ultrasound array to cause an ultrasound element with the best signal quality and the largest change in artery diameter in the flexible ultrasound array to be re-selected as the target ultrasound element.

[0017] Embodiments of the present disclosure provide a wristwatch device for blood pressure waveform monitoring and a blood pressure waveform monitoring method. The wristwatch device is integrated with a oscillograph blood pressure measurement module through a flexible ultrasound array, and combines an automatic calibration program. The flexible ultrasound array model is calibrated by user blood pressure data collected by a pressure sensor. Continuous blood pressure waveform data is provided by ultrasound. The two are complementary to each other, and 24-hour real-time monitoring of arterial blood pressure and blood pressure waveform of a user is realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings in which:

[0019] Figure 1 A structural schematic diagram of a wristwatch device for blood pressure waveform monitoring according to an embodiment of the present disclosure is schematically shown;

[0020] Figure 2 An unfolded structural schematic diagram of a wristwatch device for blood pressure waveform monitoring according to an embodiment of the present disclosure is schematically shown;

[0021] Figure 3 A dial internal structure schematic diagram according to an embodiment of the present disclosure is schematically shown;

[0022] Figure 4 This illustration schematically shows a wristwatch device for blood pressure waveform monitoring according to an embodiment of the present disclosure when worn;

[0023] Figure 5 A schematic diagram illustrating the routing of a flexible ultrasonic array and grounding electrodes according to an embodiment of the present disclosure is shown.

[0024] Figure 6 A schematic diagram of a flexible ultrasonic array and addressing electrode routing according to an embodiment of the present disclosure is shown.

[0025] Figure 7 A schematic diagram of the hardware architecture of a system circuit board according to an embodiment of the present disclosure is shown.

[0026] Figure 8 A flowchart illustrating a blood pressure waveform monitoring method according to an embodiment of the present disclosure is shown schematically. Detailed Implementation

[0027] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0028] It should be noted that similar or identical parts are referred to by the same reference numerals in the accompanying drawings or description. The technical features of the various embodiments exemplified in the specification can be freely combined to form new solutions without conflict. Furthermore, each claim can stand alone as an embodiment, or the technical features in the various claims can be combined to form new embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated in a simplified or convenient manner. Moreover, elements or implementations not shown or described in the drawings are those known to those skilled in the art.

[0029] In the description of the utility model, it needs to be explained that, unless there is definite stipulation and limitation, the terms "mount", "connect", "connection" should be understood in broad sense, for example, it can be fixed connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements. For ordinary skilled person in the art, the specific meaning of the above terms in the present disclosure can be understood according to specific circumstances. All the terms (including technical and scientific terms) used herein have the meaning generally understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having the meaning consistent with the context of the specification, and should not be interpreted in an idealized or overly stereotyped manner.

[0030] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0031] The terms used herein are merely for describing specific embodiments, and are not intended to limit the present disclosure. The terms "include", "contain" and the like used herein indicate the existence of the described features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0032] All the terms (including technical and scientific terms) used herein have the meaning generally understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having the meaning consistent with the context of the specification, and should not be interpreted in an idealized or overly stereotyped manner.

[0033] Figure 1 The structure schematic diagram of the wristwatch device for blood pressure waveform monitoring according to the embodiment of the present disclosure is schematically shown. Figure 2 The expanded structure schematic diagram of the wristwatch device for blood pressure waveform monitoring according to the embodiment of the present disclosure is schematically shown.

[0034] As Figure 1 The wristwatch device 100 for blood pressure waveform monitoring, as shown in the figure, comprises a watch dial 10, an air bag 20, a flexible ultrasonic array 30 and a watchband 40.

[0035] Wherein, as Figure 3As shown, the watch face 10 comprises a watch face body 101, a pump-valve integrated module 102 and a pressure sensor (not shown in the figure). The pump-valve integrated module 102 and the pressure sensor are arranged in the watch face body 101.

[0036] An air bag 20 is arranged on the watch face 10, and the connection part of the watch face 10 is connected to the pump-valve integrated module 102 and the pressure sensor through a conduit 50, for measuring the blood pressure of the user in real time. Specifically, when the wristwatch device 100 is worn, the pump-valve integrated module 102 fills the air bag 20 with gas through the conduit 50, so as to drive the wristwatch device 100 to compress the radial artery 70 of the user, thereby realizing the measurement of the blood pressure and the blood pressure waveform of the user.

[0037] A flexible ultrasonic array 30 is arranged on the air bag 20 and connected to a system circuit board 103 inside the watch face 101 through a flexible flat cable 60. In the embodiment of the present disclosure, the flexible ultrasonic array 30 corresponds to the radial artery 70 of the user when the wristwatch device is worn, for measuring the arterial diameter waveform of the user in real time, as shown in Figure 4

[0038] According to the embodiment of the present disclosure, the flexible ultrasonic array 30 comprises a plurality of rows of ultrasonic elements, each row of ultrasonic elements comprises a plurality of ultrasonic elements 301, and the plurality of ultrasonic elements 301 in different rows are arranged staggeredly. Among them, the plurality of ultrasonic elements 301 are arranged with a spacing between adjacent two ultrasonic elements.

[0039] Specifically, for the monitoring of the blood pressure waveform, only a single ultrasonic transducer is needed to measure the real-time arterial diameter waveform, so only one ultrasonic element 301 needs to be activated when the wristwatch device 100 is working. However, when the conventional wristwatch device is worn, the transducer cannot be adjusted to be aligned with the position of the radial artery 70, based on which, as shown in Figure 5 As shown in the structural schematic diagram of the flexible ultrasonic array 30 used in the embodiment of the present disclosure, the flexible ultrasonic array 30 comprises a plurality of ultrasonic elements 301, and the size of each ultrasonic element 301 and the distance between adjacent ultrasonic elements 301 are as small as possible. Preferably, the ultrasonic element 301 is in a geometric shape such as square, rectangle, circle, ellipse, etc., and the size thereof ranges from 0.5 to 2 mm, and the distance between adjacent ultrasonic elements 301 ranges from 0.1 to 1.0 mm, so as to arrange as many ultrasonic elements 301 as possible in a limited use range, thereby realizing the coverage of the sound field to the radial artery 70 and ensuring that the ultrasonic element 301 whose sound field is directly opposite to the radial artery 70 can always be found when the wristwatch device 100 is worn, so as to realize the accurate measurement of the arterial diameter waveform of the user.

[0040] ​It should be noted that the flexible ultrasonic array 30 includes at least two rows of ultrasonic elements, and each row of ultrasonic elements includes at least five ultrasonic elements 301, so that when different users use the wristwatch device 100, there is always one ultrasonic element 301 that can correspond to the radial artery 70 of the user, thereby accurately measuring the arterial diameter waveform of the user.

[0041] In the embodiments of the present disclosure, each ultrasonic element 301 is composed of piezoelectric material, and each ultrasonic element 301 is interconnected together through a common serpentine ground electrode trace, as shown in FIG. 2. Figure 5 In addition, each ultrasonic element 301 is connected to a driving circuit in the system circuit board 103 in the watch dial 10 through a separate upper electrode. Specifically, each ultrasonic element 301 corresponds to an upper electrode for addressing to determine the target ultrasonic element 301 used, and the addressing electrodes of each ultrasonic element 301 are separately connected to the driving circuit through a serpentine trace, as shown in FIG. 3. Figure 6

[0042] According to the embodiments of the present disclosure, the watch dial 10 further includes a screen 105, a battery 104, and a system circuit board 103. The screen 105 is used to display time and blood pressure waveform monitoring data. The battery 104 provides power for the wristwatch device 100. The system circuit board 103 includes at least a microprocessor, an ultrasonic high-voltage switching module, an ultrasonic transceiver module, a pump valve driving module, a pressure measurement module, a Bluetooth module, a WIFI module, a key module, and a battery management module, as shown in FIG. 4. Figure 7 FIG. 5 shows a hardware structure diagram of the system circuit board 103.

[0043] Specifically, when the wristwatch device 100 is in operation, the microprocessor controls the pump valve driving module to drive the pump valve integrated module 102 to inflate the air bag 20, drive the wristwatch device 100 to compress the radial artery 70 of the user's wrist, measure the pressure waveform during the inflation or deflation process, and then calculate the systolic pressure SBP and diastolic pressure DBP, while receiving the arterial diameter waveform measured by the flexible ultrasonic array 30 in real time through the ultrasonic high-voltage switching module and the ultrasonic transceiver module.

[0044] In the embodiments of the present disclosure, by integrating the Bluetooth and WIFI modules in the wristwatch device 100, the wristwatch device 100 can be connected to an external device through the Bluetooth and WIFI modules, so as to realize the interaction between the wristwatch device 100 and the external device, and facilitate the user to check the detected blood pressure waveform data through the external device. In addition, the user can also realize the electrical control of the wristwatch device 10 through the key module, so as to realize the real-time operation of the wristwatch device 10.

[0045] It should be noted that the external device can be a terminal device such as a mobile phone or a computer with communication function, and the present separate embodiments do not limit this.

[0046] ​The wristwatch device for blood pressure waveform monitoring provided by the embodiments of the present disclosure realizes real-time monitoring of arterial blood pressure and blood pressure waveform of a user for 24 hours through the organic integration of a flexible ultrasonic array and an oscillometric blood pressure measurement module and the calibration of a flexible ultrasonic array model by blood pressure data of the user collected by a pressure sensor, and the continuous blood pressure waveform data provided by ultrasonic waves, which complement each other.

[0047] Another aspect of the present disclosure provides a blood pressure waveform monitoring method based on the wristwatch device 100 for blood pressure waveform monitoring as shown in Figure 1 The method includes steps S101-S104 as shown in Figure 8

[0048] S101, inflate the air bag to compress the radial artery of the user, measure the systolic pressure and diastolic pressure of the radial artery, and then deflate the air bag.

[0049] In the embodiments of the present disclosure, the pump valve integrated module 102 is controlled by the microprocessor to inflate the air bag 20 to compress the radial artery 70 of the user, the pressure of the air bag 20 is measured by the pressure sensor during the pressure increasing process, and the pressure data is transmitted to the pressure measurement module in the system circuit board 103, and then the systolic pressure SBP and diastolic pressure DBP of the radial artery 70 are calculated, and then the air bag 20 is deflated.

[0050] S102, traverse the flexible ultrasonic array to determine a target ultrasonic element, and make the target ultrasonic element emit an ultrasonic pulse.

[0051] In the embodiments of the present disclosure, the microprocessor controls the multiplexer to traverse all ultrasonic elements 301 in the flexible ultrasonic array 30, and uses the pulse-echo method to measure the arterial diameter waveform from the echo for each ultrasonic element 301, after traversing all ultrasonic elements 301, selects the ultrasonic element with the best signal quality and the largest change in arterial diameter (which means that the acoustic field of the ultrasonic element is closest to the center of the radial artery 70) as the target ultrasonic element, the target ultrasonic element is the best use channel, and the target ultrasonic element is driven to emit an ultrasonic pulse by the high-voltage pulse generator.

[0052] S103, receive ultrasonic echoes from the target ultrasonic element, and perform signal processing analysis on the ultrasonic echoes in a preset period to obtain diameter waveform values in the preset period.

[0053] In the embodiments of the present disclosure, the ultrasonic transceiver module in the system circuit board receives ultrasonic echoes from the target ultrasonic element, which repeats 25-200 times per second, and the microprocessor calculates real-time diameter waveform D (t , according to​ The real-time cross-sectional area waveform A is calculated (t) The ultrasonic echo signals in the preset period are recorded and analyzed to obtain the diameter waveform values in the preset period, which include the maximum diameter waveform mean A s and the minimum diameter waveform mean A d .

[0054] Specifically, the preset period for starting measurement can be 1-10 periods before the start of measurement, for example, the diameter waveform D (t) in the first 1, 2, 3, …, 9 or 10 periods is calculated, and then the corresponding real-time cross-sectional area waveform A (t) is obtained, and then the maximum average value and the minimum average value of the cross-sectional area waveform A (t) in the period are calculated to obtain the maximum diameter waveform mean A s and the minimum diameter waveform mean A d .

[0055] S104, the blood pressure waveform of the user is obtained according to the diameter waveform value, the systolic pressure and the diastolic pressure.

[0056] In an embodiment of the present disclosure, the blood pressure waveform P (t) can be calculated from the diameter waveform D (t) according to the following expression:

[0057]

[0058] Wherein, α represents the arterial stiffness coefficient, representing the arterial stiffness, which can be obtained according to the maximum diameter waveform mean A s and the minimum diameter waveform mean A d and SBP, DBP:

[0059]

[0060] According to an embodiment of the present disclosure, the method comprises: S105, during the measurement process, if it is detected that the arterial echo signal received by the target ultrasonic array element becomes weak or the arterial echo quality becomes poor, the flexible ultrasonic array 30 is re-traversed to select the ultrasonic array element with the best signal quality and the largest change in arterial diameter in the flexible ultrasonic array 30 as the target ultrasonic array element.

[0061] An embodiment of the present disclosure provides a blood pressure waveform monitoring method, which is implemented based on a wristwatch device 100 for blood pressure waveform monitoring as shown in the figure. The wristwatch device 100 for blood pressure waveform monitoring will not be described in detail here.

[0062] While the present disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description is to be considered illustrative or exemplary and not restrictive; the disclosure is not limited to the disclosed embodiments.

[0063] Those skilled in the art can understand that the features recited in various embodiments and / or claims of the present disclosure can be combined in various ranges and / or combined, even if such combinations or combinations are not explicitly recited in the present disclosure. In particular, the features recited in various embodiments and / or claims of the present disclosure can be combined in various combinations and / or combined without departing from the spirit and teachings of the present disclosure. All such combinations and / or combinations fall within the scope of the present disclosure.

[0064] Although the present disclosure has been shown and described with respect to particular exemplary embodiments thereof, it should be understood by those skilled in the art that various changes in form and detail can be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined by the appended claims alone, and by their equivalents.

Claims

1. A wrist watch device for blood pressure waveform monitoring, characterized by, The wristwatch device comprises: a watch dial comprising a watch dial body, a pump-valve integrated module and a pressure sensor, wherein the pump-valve integrated module and the pressure sensor are arranged in the watch dial body; an air bag arranged on the watch dial and connected with the watch dial through a conduit to connect the pump-valve integrated module and the pressure sensor, for measuring blood pressure of a user; a flexible ultrasonic array arranged on the air bag and corresponding to the radial artery of the user when the wristwatch device is worn, for measuring arterial diameter waveform of the user in real time, the flexible ultrasonic array comprising a plurality of rows of ultrasonic elements, each row of ultrasonic elements comprising a plurality of ultrasonic elements, and the plurality of ultrasonic elements in different rows are arranged staggeredly, the plurality of ultrasonic elements are arranged with a spacing between adjacent two ultrasonic elements, and each ultrasonic element in the plurality of rows of ultrasonic elements is grounded through an electrode trace, and each ultrasonic element is individually connected to a driving circuit through an electrode trace; the watch dial further comprises a screen, a battery and a system circuit board, the screen is used for displaying time and blood pressure waveform monitoring data, the battery is used for providing power supply for the wristwatch device, and the system circuit board comprises a microprocessor, an ultrasonic high-voltage switching module, an ultrasonic transceiver module, a pump-valve driving module and a pressure measurement module; wherein, when the wristwatch device is running, the microprocessor controls the pump-valve driving module to drive the pump-valve integrated module to inflate the air bag, so as to drive the wristwatch device to compress the radial artery of the user, the pressure measurement module acquires blood pressure data of the user through the pressure sensor, and acquires the arterial diameter waveform measured by the flexible ultrasonic array in real time through the ultrasonic high-voltage switching module and the ultrasonic transceiver module; the microprocessor is configured to control the pump-valve driving module and the pressure measurement module to acquire systolic pressure and diastolic pressure of the user through the air bag and the pressure sensor, control a multiplexer to traverse all ultrasonic elements in the flexible ultrasonic array after acquiring the systolic pressure and diastolic pressure, select an ultrasonic element with best signal quality and largest arterial diameter change from all ultrasonic elements as a target ultrasonic element based on signals received by the ultrasonic transceiver module, and control the target ultrasonic element to emit ultrasonic pulses and receive echoes thereof, so as to continuously monitor arterial diameter waveform.

2. The wrist-watch device for blood pressure waveform monitoring of claim 1, wherein, the system circuit board further comprises: a key module arranged on a side surface of the watch dial and electrically connected with the microprocessor, for electrically controlling the wristwatch device.

3. The wrist-watch device for blood pressure waveform monitoring of claim 1, wherein, Each ultrasonic element is square, circular, oval or rectangular, and the distance between adjacent ultrasonic elements is 0.1-1.0 mm.

4. The wrist-watch device for blood pressure waveform monitoring of claim 1, wherein, The wristwatch device further comprises: a watchband arranged on both sides of the watch dial, for facilitating wearing of the wristwatch device.

5. A blood pressure waveform monitoring method based on the wristwatch device for blood pressure waveform monitoring according to any one of claims 1 to 4, characterized by, The method comprises: inflating the air bag to compress the radial artery of the user, and deflating the air bag after measuring systolic pressure SBP and diastolic pressure DBP of the radial artery. traversing the flexible ultrasound array to determine a target ultrasound element, causing the target ultrasound element to emit an ultrasound pulse; the traversing the flexible ultrasound array to determine a target ultrasound element comprises: traversing each ultrasound element in the flexible ultrasound array, selecting an ultrasound element in the flexible ultrasound array with the best signal quality and the largest change in artery diameter as the target ultrasound element; receiving an ultrasound echo from the target ultrasound element, and performing signal processing and analysis on the ultrasound echo in a preset period to obtain a diameter waveform value in the preset period; obtaining a blood pressure waveform of the user according to the diameter waveform value, the systolic pressure SBP and the diastolic pressure DBP.

6. The blood pressure waveform monitoring method of claim 5, wherein, The method further comprises: during the measurement, if it is detected that the artery echo signal received by the target ultrasound element is weakened or the artery echo quality is deteriorated, re-traversing the flexible ultrasound array to cause the ultrasound element in the flexible ultrasound array with the best signal quality and the largest change in artery diameter to be re-selected as the target ultrasound element.

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