Physiological feature measurement system
By setting up monitoring devices at different target parts and performing time synchronization methods, the accuracy of pulse wave continuous measurement of blood pressure is solved, and accurate measurement of physiological characteristics, especially the accurate evaluation of blood pressure and arterial function is achieved.
Patent Information
- Application Number
- CN202410090771.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-22
- Publication Date
- 2025-07-22
AI Technical Summary
The accuracy of existing continuous measurement of blood pressure based on pulse waves needs to be improved, and it is difficult to accurately obtain the pulse wave conduction time to accurately obtain physiological characteristics.
Using a physiological feature measurement system, by setting the first and second monitoring devices in different target parts, measuring pulse wave data respectively and equipped with a clock module, the time synchronization method is performed to synchronize the monitoring device time, and calculate the pulse wave conduction time to obtain physiological features.
It achieves a more accurate acquisition of pulse wave conduction time, accurately obtains the target physiological characteristics such as blood pressure and arterial function information, and improves the convenience of the measurement system and user comfort.
Smart Images
Figure CN120345876A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of medical devices, and particularly to a physiological characteristic measurement system. Background Art
[0002] Hypertension not only seriously affects the sympathetic nerves of the brain, posing a certain threat to the health and life of patients, but also even causes serious cardiovascular diseases such as heart disease and cerebral hemorrhage, resulting in a significant increase in its incidence. Traditional blood pressure measurement is usually carried out at specific time points, such as measuring once every morning or evening, while continuous blood pressure monitoring allows doctors to obtain more detailed and comprehensive blood pressure data. Continuous blood pressure monitoring is a medical monitoring technology that continuously records the blood pressure changes of an individual over a long period of time. Through this technology, it is possible to better understand the blood pressure status and fluctuations of an individual. As an important physiological indicator reflecting the cardiovascular function of patients, continuous blood pressure monitoring is of great help for the assessment of patients' cardiovascular conditions and doctors' clinical diagnosis of heart diseases.
[0003] Continuous blood pressure measurement based on the pulse wave is an implementation method of continuous blood pressure monitoring. The pulse wave refers to the pulsating fluctuation of blood passing through the artery during heart contraction. In the prior art, information reflecting blood pressure can be obtained by detecting the pulse wave transit time (also known as the time difference of the pulse wave). Specifically, the pulse wave is detected at different positions of the body, and the moments when the pulse wave passes through the above different positions are respectively recorded. Information reflecting blood pressure is obtained by calculating the time delay of the pulse wave passing through the above different positions (i.e., the pulse wave transit time). In clinical practice, the pulse wave transit time can also be used to evaluate the arterial function and the degree of arteriosclerosis, which helps to predict the risk of suffering from cardiovascular diseases and formulate guiding plans.
[0004] In practical applications, the accuracy of the existing continuous blood pressure measurement based on the pulse wave needs to be improved. Summary of the Invention
[0005] The present disclosure is proposed in view of the above situation, and its purpose is to provide a physiological characteristic measurement system that can accurately obtain the pulse wave transit time to accurately obtain the physiological characteristics of the target.
[0006] To this end, the present disclosure provides a physiological characteristic measurement system, which is a measurement system for obtaining the physiological characteristics of a target based on the pulse wave conduction time, and includes a first monitoring device and a second monitoring device disposed at different parts of the target; the first monitoring device is configured to measure the pulse wave of the target to obtain first pulse wave data and includes a first clock module for providing time information for the first pulse wave data, and the second monitoring device is configured to measure the pulse wave of the target to obtain second pulse wave data and includes a second clock module for providing time information for the second pulse wave data; the physiological characteristic measurement system obtains the pulse wave conduction time based on the first pulse wave data and the second pulse wave data, and obtains the physiological characteristics of the target based on the pulse wave conduction time; the physiological characteristic measurement system synchronizes the time of the first monitoring device and the second monitoring device by executing a time synchronization method.
[0007] In the present disclosure, by executing the time synchronization method, the time of the first clock module can be synchronized with the time of the second clock module, so that the time information of the first pulse wave data and the second pulse wave data can be synchronized, that is, the time bases of the time information of the first pulse wave data and the second pulse wave data are basically the same. Thus, it is beneficial to obtain a more accurate pulse wave conduction time, and thus beneficial to accurately obtain the physiological characteristics of the target, such as blood pressure, arterial function and other information.
[0008] In addition, in the physiological characteristic measurement system according to the present disclosure, optionally, the time synchronization method includes: determining a first communication duration between the first monitoring device and the second monitoring device based on a first communication request sent by the first monitoring device and a first response of the second monitoring device to the first communication request, where the first communication duration is the duration required for the first monitoring device and the second monitoring device to perform a round-trip communication once without considering the waiting duration for the second monitoring device to send the first response; determining a second communication duration between the first monitoring device and the second monitoring device based on a second communication request sent by the first monitoring device and a second response of the second monitoring device to the second communication request, where the second communication duration is the duration required for the first monitoring device and the second monitoring device to perform a round-trip communication once when the second monitoring device sends the second response after waiting for a preset duration, where the first communication duration and the second communication duration are based on the clock of the first clock module, and the preset duration is based on the clock of the second clock module; determining a time deviation between the first monitoring device and the second monitoring device based on the first communication duration, the second communication duration, and the preset duration; and synchronizing the time of the first monitoring device and the second monitoring device based on the time deviation. In this case, the difference between the second communication duration and the first communication duration is equivalent to a calculated value obtained based on the clock of the first clock module, and the preset duration is equivalent to the time waited based on the clock of the second clock module. If the drift amounts of the clocks of the first monitoring device and the second monitoring device are the same over time, then the difference between the second communication duration and the first communication duration should be equal to the preset duration, that is, the time deviation between the first monitoring device and the second monitoring device is 0; otherwise, the difference between the second communication duration and the first communication duration should not be equal to the preset duration, that is, the time deviation between the first monitoring device and the second monitoring device is not 0, and the clocks of the first monitoring device and the second monitoring device can be synchronized based on the time deviation determined by the preset duration, the first communication duration, and the second communication duration, thereby enabling a more accurate pulse wave conduction time to be obtained.
[0009] In addition, in the physiological characteristic measurement system according to the present disclosure, optionally, the method for determining the first communication duration includes: the first monitoring device sending the first communication request to the second monitoring device at a first moment; if the second monitoring device receives the first communication request, it sends the first response to the first monitoring device, and the first monitoring device receives the first response at a second moment; and taking the difference between the second moment and the first moment as the first communication duration. Thus, the first communication duration can be determined based on the clock of the first clock module.
[0010] In addition, in the physiological feature measurement system involved in the present disclosure, optionally, the method for determining the second communication duration includes: the first monitoring device sends a second communication request to the second monitoring device at a fourth moment; if the second monitoring device receives the second communication request, it returns a second response to the first monitoring device after a preset duration, and the first monitoring device receives the second response at a fifth moment; and the difference between the fifth moment and the fourth moment is used as the second communication duration. Thus, the second communication duration can be determined based on the clock of the first clock module.
[0011] In addition, in the physiological feature measurement system involved in the present disclosure, optionally, the time deviation is the difference between the sum of the first communication duration and the preset duration and the second communication duration. In this case, the time deviation between the first monitoring device and the second monitoring device can be obtained, and based on the time deviation, the time synchronization between the first monitoring device and the second monitoring device can be achieved. For example, the first monitoring device can adjust the first clock module based on the time deviation to synchronize the time of the first clock module with the time of the second clock module; or the second monitoring device can adjust the second clock module based on the time deviation to synchronize the time of the first clock module with the time of the second clock module.
[0012] In addition, in the physiological feature measurement system involved in the present disclosure, optionally, the physiological feature measurement system synchronizes the time of the first monitoring device and the second monitoring device by periodically executing the time synchronization method. In this case, generally, as time goes by, the clocks of the first monitoring device or the second monitoring device will drift respectively and become out of synchronization. In order to reduce the time difference between the two, the time synchronization method is executed every certain preset time interval, so that the time between the first monitoring device and the second monitoring device can be synchronized, and then a more accurate pulse wave time difference can be obtained to obtain more accurate physiological features.
[0013] In addition, in the physiological feature measurement system involved in the present disclosure, optionally, the first monitoring device sends the first pulse wave data to the second monitoring device, and the second monitoring device obtains the pulse wave conduction time based on the first pulse wave data and the second pulse wave data, and obtains the target physiological feature based on the pulse wave conduction time. In this case, only the first monitoring device and the second monitoring device are needed to complete the calculation of the pulse wave conduction time and obtain the target physiological feature, that is, the convenience of the physiological feature measurement system can be improved.
[0014] In addition, in the physiological feature measurement system involved in the present disclosure, optionally, before the first monitoring device sends the first pulse wave data to the second monitoring device, the physiological feature measurement system synchronizes the time of the first monitoring device and the second monitoring device by executing the time synchronization method. In this case, synchronizing the time of the first monitoring device and the second monitoring device before obtaining the pulse wave conduction time is beneficial to obtaining an accurate pulse wave conduction time.
[0015] In addition, in the physiological feature measurement system involved in the present disclosure, optionally, the first monitoring device establishes a communication connection with the second monitoring device through wireless communication. Thereby, the convenience of the measurement system can be improved, and the comfort of the user can be enhanced.
[0016] In addition, in the physiological feature measurement system involved in the present disclosure, optionally, the physiological feature measurement system further includes a control terminal. The first monitoring device and the second monitoring device respectively establish communication connections with the control terminal, and correct the time information of the first monitoring device and the second monitoring device based on the time information of the control terminal. In this case, based on the relatively accurate time information of the control terminal, the time of the first clock module and the second clock module can be maintained with a certain degree of accuracy. Thereby, the physiological data corresponding to the physiological features measured by the first monitoring device and the second monitoring device can have accurate time information, which is beneficial to accurately monitoring the physiological features of the target. At the same time, the first clock module and the second clock module can also be kept time-synchronized.
[0017] According to the present disclosure, a physiological feature measurement system that can obtain a relatively accurate pulse wave conduction time to more accurately obtain the physiological features of a target can be provided. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The present disclosure will now be further explained in detail only by way of examples with reference to the drawings, wherein:
[0019] Figure 1 is a diagram showing an application scenario of the measurement system involved in the example of the present disclosure.
[0020] Figure 2A is a block diagram showing the composition of the measurement system involved in the example of the present disclosure.
[0021] Figure 2B is a block diagram showing the composition of the first transmission module and the second transmission module involved in the example of the present disclosure.
[0022] Figure 3 is a flowchart showing the time synchronization method involved in the example of the present disclosure.
[0023] Figure 4AIt is a flowchart showing the determination of the first communication duration involved in the examples of the present disclosure.
[0024] Figure 4B It is a schematic diagram showing the determination of the first communication duration involved in the examples of the present disclosure.
[0025] Figure 5A It is a flowchart showing the determination of the second communication duration involved in the examples of the present disclosure.
[0026] Figure 5B It is a schematic diagram showing the determination of the second communication duration involved in the examples of the present disclosure. Detailed implementation manners
[0027] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments filled by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present disclosure.
[0028] It should be noted that the terms "first", "second", "third", and "fourth", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. It should be noted that the terms "including" and "having" in the present disclosure and any of their deformations, for example, the processes, methods, systems, products, or devices including or having a series of steps or units do not necessarily have to be limited to those steps or units clearly listed, but may include or have other steps or units not clearly listed or inherent to these processes, methods, products, or devices.
[0029] Hereinafter, with reference to the accompanying drawings, the preferred embodiments of the present disclosure will be described in detail. In the following description, the same reference numerals are given to the same components, and repeated descriptions are omitted. In addition, the drawings are only schematic diagrams, and the ratio of the sizes of the components to each other or the shapes of the components, etc. may be different from the actual ones.
[0030] In the present disclosure, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium. In addition, the term "coupling" may be a way of realizing electrical connection for signal transmission. "Coupling" may be a direct electrical connection (electrical connection is also called electrical connection) or an indirect electrical connection through an intermediate medium.
[0031] In the present disclosure, the physiological characteristic measurement system (hereinafter referred to as the measurement system) may be a physiological characteristic measurement system based on the pulse wave transit time (also referred to as the pulse wave time difference), which belongs to a non-invasive continuous blood pressure monitoring system and can non-invasively and continuously measure the blood pressure and arterial function of a target. The physiological characteristic measurement system may also be referred to as a physiological characteristic monitoring system, a physiological characteristic monitoring device, a measurement system based on the pulse wave transit time, etc.
[0032] In the present disclosure, a "target" may be referred to as an object, a user, a patient, or a client.
[0033] In the present disclosure, "physiological data" may refer to data representing the physiological characteristics of a target. For example, it may be blood pressure data of the target.
[0034] In the present disclosure, the "Pulse Transit Time (PTT)" may be used to represent the time elapsed for a pulse wave to propagate from a first part of a target to a second part of the target. PTT is usually expressed in milliseconds (ms) or seconds (s). The first part and the second part are usually arterial locations.
[0035] Figure 1 FIG. shows an application scenario diagram of the measurement system 10 involved in the examples of the present disclosure. Figure 2A FIG. shows a block diagram of the composition of the measurement system 10 involved in the examples of the present disclosure. Figure 2B FIG. shows a block diagram of the composition of the first transmission module 111 and the second transmission module 121 involved in the examples of the present disclosure.
[0036] In some examples, referring to Figure 1 , the measurement system 10 may include a first monitoring device 11. The first monitoring device 11 may be disposed at a first part of the target and is used to measure the pulse wave of the target to obtain first pulse wave data.
[0037] In some examples, referring to Figure 2A , the first monitoring device 11 may further include a first clock module 114. In this case, the first clock module 114 can provide a local clock and time information for the first monitoring device 11, so as to be able to provide a time stamp for the physiological data measured by the first monitoring device 11 (described later).
[0038] In the present disclosure, the clock of the first monitoring device 11 may refer to the clock of the first clock module 114.
[0039] In some examples, the first clock module 114 may be used to provide time information for the first pulse wave data. In this case, the first monitoring device 11 can obtain the pulse wave signal of the first part, and the pulse wave signal includes corresponding time data.
[0040] In some examples, referring to Figure 1 , the measurement system 10 may further include a second monitoring device 12. The second monitoring device 12 may be disposed at a second part of the target and configured to measure the pulse wave of the target to obtain second pulse wave data. In this case, the second monitoring device 12 can obtain the pulse wave signal of the second part, and the pulse wave signal includes corresponding time data, so that the pulse wave transit time can be measured by the two monitoring devices. Thus, the blood pressure data of the target can be calculated.
[0041] In some examples, referring to Figure 2A , the second monitoring device 12 may further include a second clock module 124. In this case, the second clock module 124 can provide a local clock and time information for the second monitoring device 12, so as to be able to provide a timestamp for the physiological data measured by the second monitoring device 12 (described later).
[0042] In the present disclosure, the clock of the second monitoring device 12 may refer to the clock of the second clock module 124.
[0043] In some examples, the second clock module 124 may be used to provide time information for the second pulse wave data. In this case, the second monitoring device 12 can obtain the pulse wave signal of the second part, and the pulse wave signal includes corresponding time data.
[0044] In some examples, the measurement system 10 may obtain the pulse wave transit time based on the first pulse wave data and the second pulse wave data, and obtain the physiological characteristics of the target based on the pulse wave transit time. Specifically, assuming that the pulse wave is transmitted from the first part to the second part, the first pulse wave data and the second pulse wave data are measured at the first part and the second part respectively, and the time for the pulse wave to be transmitted from the first part to the second part (i.e., the pulse wave transit time) is calculated. Thus, the blood pressure data and the assessment of arterial function can be obtained based on the pulse wave transit time.
[0045] In some examples, the first monitoring device 11 may send the first pulse wave data to the second monitoring device 12.
[0046] In some examples, the second monitoring device 12 may obtain the pulse wave transit time based on the first pulse wave data and the second pulse wave data.
[0047] In some examples, the second monitoring device 12 may obtain the physiological characteristics of the target based on the pulse wave transit time. In this case, only the first monitoring device 11 and the second monitoring device 12 are needed to complete the calculation of the pulse wave transit time and obtain the physiological characteristics of the target, that is, the convenience of the measurement system 10 can be improved.
[0048] In some examples, the first monitoring device 11 may have a first display module. In this case, the physiological data measured by the first monitoring device 11 can be displayed. For example, the physiological characteristics obtained based on the pulse wave conduction time can be displayed.
[0049] In some examples, the second monitoring device 12 may have a second display module. In this case, the physiological data measured by the second monitoring device 12 can be displayed. For example, the physiological characteristics obtained based on the pulse wave conduction time can be displayed.
[0050] It should be noted that the present disclosure does not limit the positions between the first monitoring device 11 and the second monitoring device 12. That is to say, according to the conduction direction of the pulse wave, the first monitoring device 11 may first monitor the first pulse wave data, then send it to the second monitoring device 12, and the second monitoring device 12 calculates the pulse wave conduction time and obtains the target physiological characteristics. It is also possible that the second monitoring device 12 first monitors the second pulse wave data and sends the second pulse wave data to the first monitoring device 11, and the first monitoring device 11 calculates the pulse wave conduction time and obtains the target physiological characteristics.
[0051] In some examples, the measurement system 10 may further include a control terminal 20. In some examples, the control terminal 20 can establish communication connections with the first monitoring device 11 and the second monitoring device 12, and respectively obtain the measured pulse wave signals and corresponding time data from the first monitoring device 11 and the second monitoring device 12. In this case, the control terminal 20 can calculate the target blood pressure data and give an indication, which is beneficial for the user or doctor to view the target blood pressure data in real time.
[0052] In some examples, the control terminal 20 may be a smart terminal, such as a smart mobile phone and a smart tablet. In some examples, the control terminal 20 may be a computer device. In some examples, the control terminal 20 may be a cloud server.
[0053] In some examples, the first monitoring device 11 or the second monitoring device 12 may also send the pulse wave conduction time to the control terminal 20. In this case, the control terminal 20 obtains the physiological characteristics. Thus, the calculation pressure on the first monitoring device 11 or the second monitoring device 12 can be reduced, and the design of the first monitoring device 11 or the second monitoring device 12 can be simplified.
[0054] In some examples, the target physiological characteristics may include specific physiological data and corresponding moments. For example, the target blood pressure data may include specific blood pressure data and corresponding moments. Thus, time - continuous physiological data can be obtained to facilitate a comprehensive analysis of the target's health status.
[0055] In some examples, the first monitoring device 11 may be disposed at a body surface position near the heart of the target, and the second monitoring device 12 may be disposed at a body surface position near the femoral artery of the target.
[0056] In some examples, the first monitoring device 11 may be disposed at a body surface position near the heart of the target, and the second monitoring device 12 may be disposed at a body surface position near the carotid artery of the target.
[0057] In some examples, the first monitoring device 11 may be disposed at a body surface position near the heart of the target, and the second monitoring device 12 may be disposed at a body surface position near the ankle artery of the target.
[0058] In some examples, the first monitoring device 11 may be disposed at a body surface position near the heart of the target, and the second monitoring device 12 may be disposed at a body surface position on the arm of the target.
[0059] In some examples, the first monitoring device 11 and the second monitoring device 12 may be disposed at different body surface positions on the same arm of the target.
[0060] In some examples, the first monitoring device 11 and the second monitoring device 12 may be respectively disposed at body surface positions on two different arms of the target.
[0061] In some examples, the first monitoring device 11 and the second monitoring device 12 may be disposed at different body surface positions on the same leg of the target.
[0062] In some examples, the first monitoring device 11 and the second monitoring device 12 may be disposed at body surface positions on different legs of the target.
[0063] In some examples, the first monitoring device 11 and the second monitoring device 12 may be disposed at other different parts of the target, such as between the fingers, wrists, and earlobes.
[0064] In some examples, the first monitoring device 11 may include a first sensing module 112. Thus, physiological data characterizing the physiological characteristics of the target can be measured.
[0065] In some examples, the first sensing module 112 may include a pulse wave sensor. In some examples, the pulse wave sensor may be a photoelectric sensor, an arterial pressure waveform instrument, or any other device that can record a pulse wave signal.
[0066] In some examples, the first sensing module 112 may further include an analyte sensor. Thus, various physiological characteristics of the target can be obtained. For example, the analytes detected by the analyte sensor may include one or more of glucose, acetylcholine, amylase, bilirubin, cholesterol, chorionic gonadotropin, creatine kinase, creatine, creatinine, DNA, fructosamine, glucose, glutamine, growth hormone, hormone, ketone body, lactate, oxygen, peroxide, prostate specific antigen, prothrombin, RNA, thyroid stimulating hormone, or troponin.
[0067] In some examples, the first sensing module 112 may include an electrocardiogram sensor. In this case, bioelectric currents are generated during the beating of the heart and transmitted to the body surface, causing different potential changes in different parts of the body, thereby forming a body surface potential difference. The dynamic curve obtained by recording the body surface potential difference is the electrocardiogram signal data.
[0068] In some examples, physiological data can be obtained by combining electrocardiogram signal data and pulse wave signal data. For example, blood pressure data can be obtained by combining electrocardiogram signal data and pulse wave signal data. Thus, the physical health status of the target can be evaluated more accurately.
[0069] In some examples, the first sensing module 112 may include a temperature sensor. Thus, the physiological characteristics of the target can be reflected more comprehensively. In some examples, the temperature sensor may be a thermistor sensor.
[0070] In some examples, the first sensing module 112 may include an inertial sensor. In this case, during the movement of the target, due to the influence of jitter, physiological signals such as electrocardiogram, pulse wave, and respiration will all generate motion noise. The inertial sensor can simultaneously collect the acceleration signal and angular acceleration signal of the target. By analyzing the acceleration signal and angular acceleration signal, the posture, body position, and amount of exercise of the target can be estimated. In addition, analyzing the acceleration signal and angular acceleration signal can reduce the motion artifact noise of other physiological signals.
[0071] In some examples, the first monitoring device 11 may include a first power module 113. In some examples, the first power module 113 may include a rechargeable battery.
[0072] In some examples, the first monitoring device 11 may include a first transmission module 111.
[0073] In some examples, the first transmission module 111 may be coupled to the first sensing module 112. In this case, the first transmission module 111 can receive the physiological data measured by the first sensing module 112.
[0074] In some examples, the first transmission module 111 may be coupled to an external device. In this case, the first transmission module 111 is capable of communicating with the external device, for example, capable of transmitting the physiological data measured by the first sensing module 112 to other devices.
[0075] In some examples, the first transmission module 111 may include a first communication module 1111. In this case, the first transmission module 111 is capable of communicating with other devices through the first communication module 1111 and is capable of sending and receiving data.
[0076] In some examples, the first transmission module 111 may include a first control module 1112. In this case, the first control module 1112 is capable of executing a control program to control the operation of the first transmission module 111.
[0077] In some examples, the first control module 1112 may be a microcontroller, a central processing unit, or a field programmable gate array (FPGA).
[0078] In some examples, the first transmission module 111 may include a first storage module 1113. In this case, the first storage module 1113 is capable of storing program data and physiological data.
[0079] In some examples, the first storage module 1113 may include any one or more of a read-only memory (ROM), a random access memory (RAM), and a non-volatile memory (NVM).
[0080] In some examples, the second monitoring device 12 may include a second sensing module 122. Thus, physiological data of the target can be obtained.
[0081] In some examples, the second monitoring device 12 may include a second power module 123.
[0082] In some examples, the second sensing module 122 may be the same as the first sensing module 112. The description of the first sensing module 112 also applies to the second sensing module 122.
[0083] In some examples, the second power module 123 may be the same as the first power module 113. The description of the first power module 113 also applies to the second power module 123.
[0084] In some examples, the second monitoring device 12 may include a second transmission module 121.
[0085] In some examples, the second transmission module 121 may have the same composition as the first transmission module 111.
[0086] In this disclosure, the description of the first transmission module 111 equally applies to the second transmission module 12.
[0087] In some examples, the second transmission module 121 may include a second communication module 1211. In some examples, the second transmission module 121 may include a second control module 1212. In some examples, the second transmission module 121 may include a second storage module 1213.
[0088] In some examples, the first monitoring device 11 can establish a communication connection with the second monitoring device 12 through wireless communication. Thereby, the convenience of the measurement system 10 can be improved, and the comfort of the user can be enhanced.
[0089] In some examples, the first monitoring device 11 can establish a communication connection with the second transmission module 121 of the second monitoring device 12 through the first transmission module 111.
[0090] In some examples, the first transmission module 111 can establish a communication connection with the control terminal 20 through wireless communication. Thereby, the control terminal 20 can obtain the pulse wave data in real time.
[0091] In some examples, the second transmission module 121 can establish a communication connection with the control terminal 20 through wireless communication.
[0092] In some examples, the wireless communication method may include but is not limited to at least one of Bluetooth, Wifi, 3G / 4G / 5G, NFC, UWB, and Zig-Bee.
[0093] In some examples, the first transmission module 111 can establish a communication connection with the second transmission module 121 through the body area network protocol.
[0094] In some examples, the first transmission module 111 can establish a communication connection with the second transmission module 121 through the target's body. For example, the first transmission module 111 can establish a communication connection with the second transmission module 121 through the skin.
[0095] In some examples, the first transmission module 111 can establish a communication connection with the first transmission module 111 through wired communication. Thereby, the anti-interference ability of the communication connection can be increased.
[0096] In some examples, the means of wired communication may include any one of coaxial cable, twisted pair, optical fiber, power line communication (PLC), synchronous serial interface, parallel interface, USB (Universal Serial Bus), RS-232 (Recommended Standard 232), and RS-485 (Recommended Standard 485).
[0097] In some examples, the first monitoring device 11 may send transmission data to the second monitoring device 12 through the first transmission module 111, and the second monitoring device 12 may receive the transmission data sent by the first monitoring device 11 through the second transmission module 121.
[0098] In some examples, the second monitoring device 12 may send transmission data to the first monitoring device 11 through the second transmission module 121, and the first monitoring device 11 may receive the transmission data sent by the second monitoring device 12 through the first transmission module 111.
[0099] In some examples, the transmission data for communication between the first monitoring device 11 and the second monitoring device 12 may include physiological data.
[0100] In some examples, the transmission data for communication between the first monitoring device 11 and the second monitoring device 12 may include time data (which may also be referred to as time information or timestamp). In some examples, the time data may include the time information of the first monitoring device 11 or the second monitoring device 12 itself. For example, the moment when the first monitoring device 11 measures the first pulse wave data and the moment when the second monitoring device 12 measures the second pulse wave data.
[0101] In some examples, the physiological data and the time data may have a corresponding relationship. That is, there is corresponding physiological data at different moments. Thus, the physiological data can carry a timestamp, enabling multi-faceted real-time monitoring of the user's physiological health status.
[0102] In some examples, the second monitoring device 12 and the first monitoring device 11 may be the same device. That is, the second monitoring device 12 and the first monitoring device 11 may be wearable devices that acquire the same physiological data.
[0103] In some examples, the first monitoring device 11 may be a wearable device. In some examples, the second monitoring device 12 may also be a wearable device.
[0104] In some examples, the second monitoring device 12 and the first monitoring device 11 may be different types of devices. For example, the first monitoring device 11 may be a smart watch, and the second monitoring device 12 may be a continuous glucose monitor including a pulse wave sensor. Or, the second monitoring device 12 may be a smart watch, and the first monitoring device 11 may be a continuous glucose monitor including a pulse wave sensor.
[0105] In some examples, the second monitoring device 12 and the first monitoring device 11 may have the same composition. In other words, in the present disclosure, the description of the first monitoring device 11 also applies to the second monitoring device 12.
[0106] In some examples, over time, the clocks of the first monitoring device 11 and the second monitoring device 12 will drift, and the drift amounts of their respective clocks are different. In other words, over time, the pulse wave conduction time obtained by the measurement system 10 is inconsistent with the actual situation. Therefore, the measurement system 10 needs to execute a time synchronization method to synchronize the times of the first monitoring device 11 and the second monitoring device 12.
[0107] In some examples, the measurement system 10 may execute a time synchronization method to synchronize the times of the first monitoring device 11 and the second monitoring device 12. In other words, the measurement system 10 may execute a time synchronization method to synchronize the times of the first clock module 114 and the second clock module 124. In this case, it is possible to reduce the problem that the time information of the first pulse wave data and the second pulse wave data is out of sync due to the time asynchronization between the first clock module 114 and the second clock module 124, and further cause the inaccuracy of the pulse wave conduction time. In some examples, the transmission data for communication between the first monitoring device 11 and the second monitoring device 12 may include a time synchronization request. For example, the first monitoring device 11 may send a time synchronization request to the second monitoring device 12. After receiving the time synchronization request, the second monitoring device 12 returns response data related to the time synchronization method, and the time synchronization method is completed between the first monitoring device 11 and the second monitoring device 12.
[0108] In the present disclosure, the first monitoring device 11 may send a time synchronization request to the second monitoring device 12, and the second monitoring device 12 may also send a time synchronization request to the first monitoring device 11.
[0109] In some examples, before the first monitoring device 11 sends the first pulse wave data to the second monitoring device 12, the measurement system 10 can synchronize the time of the first monitoring device 11 and the second monitoring device 12 by performing a time synchronization method. In this case, synchronizing the time of the first monitoring device 11 and the second monitoring device 12 before obtaining the pulse wave conduction time is beneficial to obtaining an accurate pulse wave conduction time.
[0110] In some examples, before the second monitoring device 12 sends the second pulse wave data to the first monitoring device 11, the measurement system 10 can synchronize the time of the first monitoring device 11 and the second monitoring device 12 by performing a time synchronization method.
[0111] In some examples, the measurement system 10 can synchronize the time of the first monitoring device 11 and the second monitoring device 12 by periodically performing a time synchronization method. For example, the measurement system 10 can perform the time synchronization method every 30 seconds, 1 minute, 3 minutes, 5 minutes, 7 minutes, or 10 minutes. In this case, generally, over time, the clocks of the first monitoring device 11 or the second monitoring device 12 will each drift and become out of sync. In order to reduce the time difference between the two, the time synchronization method is performed every certain preset time interval, so that the time between the first monitoring device 11 and the second monitoring device 12 can be synchronized, and thus a more accurate pulse wave time difference can be obtained to obtain more accurate physiological characteristics.
[0112] In some examples, the first monitoring device 11 can periodically send a time synchronization request carrying time data to the second monitoring device 12. Similarly, in some examples, the second monitoring device 12 can periodically send a time synchronization request carrying time data to the first monitoring device 11.
[0113] In the present disclosure, the example of the first monitoring device 11 sending a time synchronization request to the second monitoring device 12 is used for introduction.
[0114] In some examples, the time synchronization request can be a request for the expected recipient to return a response. Specifically, the recipient can have an interface for receiving the time synchronization request. When the time synchronization request is received, the recipient can return a response to the sender of the time synchronization request.
[0115] In some examples, the time synchronization request can carry information for the expected recipient to immediately execute the response process.
[0116] In some examples, the time synchronization request sent by the first monitoring device 11 can carry the time data of the first monitoring device 11. Thus, the second monitoring device 12 can learn the time information of the first monitoring device 11.
[0117] In the present disclosure, when the distance between the first monitoring device 11 and the second monitoring device 12 is close enough (or when the duration of communication between the first monitoring device 11 and the second monitoring device 12 can be ignored), after the second monitoring device 12 receives the time synchronization request from the first monitoring device 11, the second monitoring device 12 can adjust its own clock based on the time data of the first monitoring device 11 carried in the time synchronization request.
[0118] In some examples, after the first monitoring device 11 sends out a time synchronization request, a record can be retained locally at the first monitoring device 11. In other words, the first monitoring device 11 can retain the transmission data it sends.
[0119] In some examples, after the second monitoring device 12 sends out a time synchronization request, a record can be retained locally at the second monitoring device 12. In other words, the second monitoring device 12 can retain the transmission data it sends.
[0120] In the present disclosure, the time synchronization request can also be represented by a communication request.
[0121] Figure 3 is a flowchart showing the time synchronization method involved in the examples of the present disclosure. Figure 4A is a flowchart showing the determination of the first communication duration involved in the examples of the present disclosure. Figure 4B is a schematic diagram showing the determination of the first communication duration involved in the examples of the present disclosure. Figure 5A is a flowchart showing the determination of the second communication duration involved in the examples of the present disclosure. Figure 5B is a schematic diagram showing the determination of the second communication duration involved in the examples of the present disclosure.
[0122] In some examples, referring to Figure 3 , the time synchronization method may include: determining the first communication duration between the first monitoring device 11 and the second monitoring device 12 based on the first communication request sent by the first monitoring device 11 and the first response of the second monitoring device 12 to the first communication request (step S100); determining the second communication duration between the first monitoring device 11 and the second monitoring device 12 based on the second communication request sent by the first monitoring device 11 and the second response of the second monitoring device 12 to the second communication request (step S200); determining the time deviation between the first monitoring device 11 and the second monitoring device 12 (step S300); and synchronizing the time of the first monitoring device 11 and the second monitoring device 12 based on the time deviation (step S400).
[0123] In some examples, in step S100, the first communication duration between the first monitoring device 11 and the second monitoring device 12 may be determined based on the first communication request sent by the first monitoring device 11 and the first response of the second monitoring device 12 to the first communication request.
[0124] In some examples, the communication duration may be the duration required for the first monitoring device 11 and the second monitoring device 12 to perform a round-trip communication once. For example, the process of the first monitoring device 11 and the second monitoring device 12 performing a round-trip communication once may be that the first monitoring device 11 sends a first communication request, the second monitoring device 12 receives the first communication request, then the second monitoring device 12 sends a first response, and the first monitoring device 11 receives the first response. The duration of the above round-trip communication process may be the first communication duration.
[0125] In some examples, the first communication duration may be the duration required for the first monitoring device 11 and the second monitoring device 12 to perform a round-trip communication once without considering the waiting duration for the second monitoring device 12 to send the first response. In other words, during the process of the first monitoring device 11 and the second monitoring device 12 performing a round-trip communication once, when the second monitoring device 12 sends the first response, it may not go through the set waiting time but send the first response immediately.
[0126] In some examples, the waiting duration for the second monitoring device 12 to send the first response may be related to the circuit structure of the second monitoring device 12 itself and belongs to its own characteristic parameter.
[0127] In some examples, multiple first communication durations may be determined, and the average value of the multiple first communication durations may be calculated, and the average value of the multiple first communication durations may be used as the first communication duration. In this case, since the first communication duration determined each time may be different. For example, when the first monitoring device 11 and the second monitoring device 12 communicate wirelessly, the first communication duration may be affected by network latency or network interference and thus may be different. By determining multiple first communication durations and using the average value of the multiple first communication durations as the first communication duration, the obtained first communication duration can be made more accurate, thereby improving the accuracy of the time synchronization method.
[0128] In some examples, referring to Figure 4A , the method for determining the first communication duration may include: the first monitoring device 11 sends a first communication request to the second monitoring device 12 at the first moment t1 (step S101); if the second monitoring device 12 receives the first communication request, it sends a first response to the first monitoring device 11 (step S102); and the difference between the second moment t2 and the first moment t1 is used as the first communication duration (step S103). Thus, the first communication duration can be determined based on the clock of the first clock module 114.
[0129] In some examples, referring to Figure 4B , in step S101, the first monitoring device 11 may send a first communication request to the second monitoring device 12 at the first moment t1.
[0130] In some examples, the first moment t1 may refer to the moment of the first monitoring device 11 recorded when the first monitoring device 11 sends a first communication request to the second monitoring device 12 based on the clock of the first clock module 114.
[0131] In some examples, in step S102, if the second monitoring device 12 receives the first communication request, it may send a first response to the first monitoring device 11.
[0132] In some examples, the communication request may carry an instruction to activate a preset duration. In this case, when the receiving party receives the communication request, it can cause the receiving party to return a response to the sending party after a set waiting time.
[0133] In some examples, the preset duration may refer to a specifically existing delay set. In some examples, the preset duration may be set by pre-writing a program.
[0134] In some examples, the preset duration can be set manually.
[0135] In some examples, the preset duration can be changed. That is to say, the preset duration may not be a fixed value.
[0136] In some examples, if the communication request does not carry an instruction to activate a preset duration, it can be considered that this communication request requires an immediate response. In other words, when the second monitoring device 12 receives the first communication request, the second monitoring device 12 can immediately return a first response to the first monitoring device 11.
[0137] In some examples, after the second monitoring device 12 receives the communication request, it can immediately enter the process of processing and returning a first response to the first monitoring device 11. Specifically, referring to Figure 4B , the second monitoring device 12 receives the first communication request at the third moment t3 and returns a first response at the third moment t3.
[0138] In some examples, when the second monitoring device 12 receives the first communication request, there is a time required to make a reaction (also called the reaction time of the device). After the reaction time of the device, the second monitoring device 12 can enter the process of the first communication request and return a first response.
[0139] In some examples, the reaction time of the second monitoring device 12 can be 10 milliseconds, 20 milliseconds, 30 milliseconds or 50 milliseconds.
[0140] In some examples, in step S103, the difference between the second moment t2 and the first moment t1 may be used as the first communication duration.
[0141] In some examples, the second moment t2 may be the moment when the first monitoring device 11 receives the first response.
[0142] In some examples, the second moment t2 may refer to the second moment t2 of the first monitoring device 11 recorded when the first monitoring device 11 receives the first response based on the clock of the first clock module 114.
[0143] In some examples, both the second moment t2 and the first moment t1 may be based on the clock of the first clock module 114. In the present disclosure, it can be understood that the first moment t1 and the second moment t2 should be based on the clock of the same device. That is to say, if the first moment t1 is based on the clock of the first monitoring device 11, the second moment t2 should also be based on the clock of the first monitoring device 11. In this case, the first communication duration obtained based on the first moment t1 and the second moment t2 can have a unique clock reference.
[0144] In some examples, referring to Figure 3 , the time synchronization method may further include: determining the second communication duration between the first monitoring device 11 and the second monitoring device 12 based on the second communication request sent by the first monitoring device 11 and the second response of the second monitoring device 12 to the second communication request (step S200).
[0145] In some examples, the second communication duration may be the duration required for a round-trip communication between the first monitoring device 11 and the second monitoring device 12 when the second monitoring device 12 sends the second response after waiting for a preset duration. In other words, during the process of a round-trip communication between the first monitoring device 11 and the second monitoring device 12, the second monitoring device 12 needs to go through a set waiting time when sending the second response. Specifically, the second communication request sent by the first monitoring device 11 may carry an instruction to activate the preset duration of the second monitoring device 12. When the second monitoring device 12 receives the second communication request, the second monitoring device 12 may return the second response to the first monitoring device 11 after a set waiting time.
[0146] In some examples, multiple second communication durations can be determined within the same preset duration, and the average value of the multiple second communication durations can be calculated, with the average value of the multiple second communication durations being used as the second communication duration. In this case, since the second communication duration determined each time may vary. For example, when the first monitoring device 11 communicates with the second monitoring device 12 wirelessly, the second communication duration may be affected by network latency and thus may be different. Therefore, by determining multiple second communication durations within the same preset duration and using the average value of the multiple second communication durations as the second communication duration, the obtained second communication duration can be made more appropriate, thereby improving the accuracy of the time synchronization method.
[0147] In some examples, referring to Figure 5A , the method for determining the second communication duration may include: the first monitoring device 11 sending a second communication request to the second monitoring device 12 at the fourth moment t4 (step S201); if the second monitoring device 12 receives the second communication request, it returns a second response to the first monitoring device 11 after a preset duration (step S202); and taking the difference between the fifth moment t5 and the fourth moment t4 as the second communication duration (step S203). Thus, the second communication duration can be determined based on the clock of the first clock module 114.
[0148] In some examples, in step S201, the first monitoring device 11 may send a second communication request to the second monitoring device 12 at the fourth moment t4.
[0149] In some examples, referring to Figure 5B , the fourth moment t4 may refer to the fourth moment t4 of the first monitoring device 11 recorded when the first monitoring device 11 sends a second communication request to the second monitoring device 12 based on the clock of the first clock module 114.
[0150] In some examples, in step S202, if the second monitoring device 12 receives the second communication request, it may return a second response to the first monitoring device 11 after a preset duration.
[0151] In some examples, referring to Figure 5B , the sixth moment t6 may be the moment when the second monitoring device 12 receives the second communication request.
[0152] In some examples, the sixth moment t6 may refer to the sixth moment t6 of the second monitoring device 12 recorded when the second monitoring device 12 receives the second communication request based on the clock of the second clock module 124.
[0153] In some examples, referring to Figure 5B, the seventh moment t7 can be the moment when the second monitoring device 12 returns the second response. In other words, the second monitoring device 12 receives the second communication request at the sixth moment t6, and after a preset duration, returns the second response at the seventh moment t7.
[0154] In some examples, the seventh moment t7 can refer to the seventh moment t7 of the second monitoring device 12 recorded when the second monitoring device 12 returns the second response based on the clock of the second clock module 124.
[0155] In some examples, the preset duration can be greater than the reaction time of the device. For example, the preset duration can be greater than the reaction time of the first monitoring device 11; or, the preset duration can be greater than the reaction time of the second monitoring device 12. In this case, since regardless of whether the device receives a communication request that expects an immediate response or a request that expects to wait for a preset duration before returning a response, the device needs to go through a reaction time to respond. If the preset duration is less than the reaction time of the device, the preset duration has ended after the reaction time of the device has ended, and the actual waiting time is greater than the preset duration at this time; making the preset duration greater than the reaction time of the device can improve the consistency between the actual waiting time and the preset duration.
[0156] In some examples, in step S203, the difference between the fifth moment t5 and the fourth moment t4 can be used as the second communication duration.
[0157] In some examples, refer to Figure 5B , the fifth moment t5 can be the moment when the first monitoring device 11 receives the second response.
[0158] In some examples, the fifth moment t5 can refer to the fifth moment t5 of the first monitoring device 11 recorded when the first monitoring device 11 receives the second response based on the clock of the first clock module 114.
[0159] In some examples, the fourth moment t4 and the fifth moment t5 can both be based on the clock of the first clock module 114. In the present disclosure, it can be understood that the fourth moment t4 and the fifth moment t5 should be based on the clock of the same device, that is, if the fourth moment t4 is based on the clock of the first monitoring device 11, then the fifth moment t5 should also be based on the clock of the first monitoring device 11. In this case, the second communication duration obtained based on the fourth moment t4 and the fifth moment t5 can have a unique clock reference.
[0160] It should be noted that in the present disclosure, the first moment t1, the second moment t2, the third moment t3, the fourth moment t4, the fifth moment t5, the sixth moment t6, and the seventh moment t7 do not limit the specific time sequence, but are only a naming method of moments, and inFigure 4B and Figure 5B In Figure 4B and Figure 5B , the positions and intervals at each moment are only schematic representations, and do not limit the time sequence of each moment and the magnitude of the time interval between each moment.
[0161] In some examples, the first communication duration and the second communication duration can be based on the clock of the first clock module 114, and the preset duration can be based on the clock of the second clock module 124. That is, the sixth moment t6 and the seventh moment t7 can be based on the clock of the second monitoring device 12. In this case, it is possible to make the difference between the second communication duration and the first communication duration have a different clock reference from the preset duration, thereby facilitating the determination of the time synchronization situation between the first monitoring device 11 and the second monitoring device 12.
[0162] In some examples, referring to Figure 3 , the time synchronization method may further include: determining the time deviation between the first monitoring device 11 and the second monitoring device 12 (step S300).
[0163] In some examples, the time deviation between the first monitoring device 11 and the second monitoring device 12 can characterize the difference in the speed of time passage between the first monitoring device 11 and the second monitoring device 12. In other words, as time goes by, the drift amount of the clock of the first monitoring device 11 and the drift amount of the clock of the second monitoring device 12 can be different.
[0164] In some examples, the time deviation between the first monitoring device 11 and the second monitoring device 12 can be determined based on the first communication duration, the second communication duration, and the preset duration.
[0165] In some examples, the time deviation can be the difference between the sum of the first communication duration and the preset duration and the second communication duration. The time deviation can be obtained by formula 1.
[0166] T = (T1 + P) - T2... formula 1
[0167] Wherein, T is the time deviation, P is the first communication duration, T1 is the preset duration, and T2 is the second communication duration. In this case, the time deviation between the first monitoring device 11 and the second monitoring device 12 can be obtained, and based on the time deviation, the time synchronization between the first monitoring device 11 and the second monitoring device 12 can be achieved. For example, the first monitoring device 11 can adjust the first clock module 114 based on the time deviation to synchronize the time of the first clock module 114 with the time of the second clock module 124; or the second monitoring device 12 can adjust the second clock module 124 based on the time deviation to synchronize the time of the first clock module 114 with the time of the second clock module 124.
[0168] In some examples, referring toFigure 3 The time synchronization method may further include: synchronizing the time of the first monitoring device 11 and the second monitoring device 12 based on the time deviation (step S400).
[0169] In some examples, the control terminal 20 may have accurate time information. In some examples, the control terminal 20 may communicate with the Internet to obtain more accurate time.
[0170] In some examples, the first monitoring device 11 may establish a communication connection with the control terminal 20 and correct the time information of the first monitoring device 11 based on the time information of the control terminal 20.
[0171] In some examples, the second monitoring device 12 may establish a communication connection with the control terminal 20 and correct the time information of the second monitoring device 12 based on the time information of the control terminal 20.
[0172] In some examples, the first monitoring device 11 and the second monitoring device 12 may respectively establish communication connections with the control terminal 20, and correct the time information of the first monitoring device 11 and the second monitoring device 12 based on the time information of the control terminal 20. In this case, based on the more accurate time information of the control terminal 20, the first clock module 114 and the second clock module 124 can be maintained at a certain accuracy, thereby enabling the physiological data corresponding to the physiological characteristics measured by the first monitoring device 11 and the second monitoring device 12 to have accurate time information, which is beneficial to accurately monitoring the physiological characteristics of the target. At the same time, the first clock module 114 and the second clock module 124 can also be kept time-synchronized.
[0173] In the time synchronization method of the present disclosure, the difference between the second communication duration and the first communication duration is equivalent to the calculated value obtained based on the clock of the first clock module 114, and the preset duration is equivalent to the time waited based on the clock of the second clock module 124. If, over time, the drift amounts of the clocks of the first monitoring device 11 and the second monitoring device 12 are the same, then the difference between the second communication duration and the first communication duration should be equal to the preset duration, that is, the time deviation between the first monitoring device 11 and the second monitoring device 12 is 0; otherwise, the difference between the second communication duration and the first communication duration should not be equal to the preset duration, that is, the time deviation between the first monitoring device 11 and the second monitoring device 12 is not 0, and the clocks of the first monitoring device 11 and the second monitoring device 12 can be synchronized based on the time deviation determined by the preset duration, the first communication duration, and the second communication duration, thereby enabling a more accurate pulse wave conduction time to be obtained.
[0174] According to the present disclosure, a measurement system 10 can be provided, which is a measurement system 10 for obtaining the physiological characteristics of a target based on the pulse wave conduction time. The measurement system 10 can include a first monitoring device 11 and a second monitoring device 12 disposed at different parts of the target. The first monitoring device 11 can be used to measure the pulse wave of the target to obtain first pulse wave data and includes a first clock module 114 that provides time information for the first pulse wave data. The second monitoring device 12 can be used to measure the pulse wave of the target to obtain second pulse wave data and includes a second clock module 124 that provides time information for the second pulse wave data. The measurement system 10 can obtain the pulse wave conduction time based on the first pulse wave data and the second pulse wave data, and obtain the physiological characteristics of the target based on the pulse wave conduction time. The measurement system 10 can perform a time synchronization method to synchronize the time of the first monitoring device 11 and the second monitoring device 12. In this case, by performing the time synchronization method, the time of the first clock module 114 can be synchronized with the time of the second clock module 124, so that the time information of the first pulse wave data and the second pulse wave data can be synchronized, that is, the time reference of the time information of the first pulse wave data and the second pulse wave data is basically the same. Thus, it is beneficial to obtain a more accurate pulse wave conduction time, and thus beneficial to accurately obtain the physiological characteristics of the target, such as information on blood pressure, arterial function, etc.
[0175] Although the present disclosure has been specifically described above in conjunction with the accompanying drawings and examples, it can be understood that the above description does not limit the present disclosure in any form. Those skilled in the art can make deformations and changes to the present disclosure according to needs without departing from the essence and scope of the present disclosure, and these deformations and changes all fall within the scope of the present disclosure.
Claims
1. A physiological characteristic measurement system is a measurement system that obtains the physiological characteristics of a target based on the pulse wave conduction time, and is characterized in that it includes a first monitoring device and a second monitoring device disposed at different parts of the target; the first monitoring device is used to measure the pulse wave of the target to obtain first pulse wave data and includes a first clock module that provides time information for the first pulse wave data, and the second monitoring device is used to measure the pulse wave of the target to obtain second pulse wave data and includes a second clock module that provides time information for the second pulse wave data; the physiological characteristic measurement system obtains the pulse wave conduction time based on the first pulse wave data and the second pulse wave data, and obtains the physiological characteristics of the target based on the pulse wave conduction time; the physiological characteristic measurement system synchronizes the time of the first monitoring device and the second monitoring device by executing a time synchronization method.
2. The physiological characteristic measurement system according to claim 1, wherein the time synchronization method includes: determining a first communication duration between the first monitoring device and the second monitoring device based on a first communication request sent by the first monitoring device and a first response of the second monitoring device to the first communication request, where the first communication duration is the duration required for the first monitoring device and the second monitoring device to perform a round-trip communication once without considering the waiting duration for the second monitoring device to send the first response; determining a second communication duration between the first monitoring device and the second monitoring device based on a second communication request sent by the first monitoring device and a second response of the second monitoring device to the second communication request, where the second communication duration is the duration required for the first monitoring device and the second monitoring device to perform a round-trip communication once when the second monitoring device waits for a preset duration and then sends the second response, and wherein the first communication duration and the second communication duration are based on the clock of the first clock module, and the preset duration is based on the clock of the second clock module; determining a time deviation between the first monitoring device and the second monitoring device based on the first communication duration, the second communication duration, and the preset duration; and synchronizing the time of the first monitoring device and the second monitoring device based on the time deviation.
3. The physiological characteristic measurement system according to claim 2, wherein the method for determining the first communication duration includes: the first monitoring device sends the first communication request to the second monitoring device at a first moment; if the second monitoring device receives the first communication request, it sends the first response to the first monitoring device, and the first monitoring device receives the first response at a second moment; and taking the difference between the second moment and the first moment as the first communication duration.
4. The physiological characteristic measurement system according to claim 2, wherein The method for determining the second communication duration includes: the first monitoring device sends a second communication request to the second monitoring device at a fourth moment; if the second monitoring device receives the second communication request, it returns a second response to the first monitoring device after a preset duration, and the first monitoring device receives the second response at a fifth moment; and the difference between the fifth moment and the fourth moment is used as the second communication duration.
5. The physiological characteristic measurement system according to claim 2, wherein The time deviation is the difference between the sum of the first communication duration and the preset duration and the second communication duration.
6. The physiological characteristic measurement system according to claim 1, wherein The physiological characteristic measurement system makes the time of the first monitoring device and the second monitoring device synchronized by periodically executing the time synchronization method.
7. The physiological characteristic measurement system according to claim 1, wherein The first monitoring device sends the first pulse wave data to the second monitoring device, and the second monitoring device obtains the pulse wave conduction time based on the first pulse wave data and the second pulse wave data, and obtains the physiological characteristic of the target based on the pulse wave conduction time.
8. The physiological characteristic measurement system according to claim 7, wherein Before the first monitoring device sends the first pulse wave data to the second monitoring device, the physiological characteristic measurement system makes the time of the first monitoring device and the second monitoring device synchronized by executing the time synchronization method.
9. The physiological characteristic measurement system according to claim 1, wherein The first monitoring device establishes a communication connection with the second monitoring device through a wireless communication method.
10. The physiological characteristic measurement system according to any one of claims 1 to 9, wherein The physiological characteristic measurement system further includes a control terminal, the first monitoring device and the second monitoring device respectively establish communication connections with the control terminal, and correct the time information of the first monitoring device and the second monitoring device based on the time information of the control terminal.