Pulse wave acquisition apparatus and method

Abstract

The embodiment of the application discloses a pulse wave collecting device and method, the pulse wave collecting device comprises: a wristband main body, which is used for being worn on the left wrist or the right wrist of a human body; a first sensor group, which is arranged on the wristband main body and comprises a plurality of first pulse wave sensors arranged in sequence along the width direction of the wristband main body, the width direction of the wristband main body corresponds to the blood flow direction of the blood vessel of the human body; and a second sensor group, which is arranged on the wristband main body, the second sensor group and the first sensor are distributed along the circumferential direction of the wristband main body, the second sensor group comprises a plurality of second pulse wave sensors arranged in sequence along the width direction of the wristband main body, and the plurality of second pulse wave sensors correspond to the plurality of first pulse wave sensors one by one; wherein when the wristband main body is worn on the left wrist or the right wrist, one of the first sensor group and the second sensor group can collect the pulse wave of the corresponding wrist.

Description

Technical Field

[0001] This application relates to the field of non-invasive detection technology of human health status, and in particular to a pulse wave acquisition device and method. Background Technology

[0002] Human pulse waves contain a wealth of physiological information. For example, Tibetan medicine obtains pulse signals by pressing the radial artery in the wrist with the fingertips of the index, middle, and ring fingers to determine the body's health status.

[0003] In wristband-type pulse acquisition devices, the sensor array is only compatible with single-handed acquisition. When switching to the other wrist, the entire wristband needs to be rotated, which makes the operation of the wristband-type pulse acquisition device cumbersome and uncomfortable to wear. Summary of the Invention

[0004] This application discloses a pulse wave acquisition device and method. When acquiring pulse waves from the left and right wrists, the pulse wave acquisition device does not require rotating the wearing direction of the device, thus improving the ease of use of the pulse wave acquisition device.

[0005] In a first aspect, embodiments of this application provide a pulse wave acquisition device, comprising: a wristband body for wearing on the left or right wrist of a human body; a first sensor group disposed on the wristband body, including a plurality of first pulse wave sensors arranged sequentially along the width direction of the wristband body, the width direction of the wristband body corresponding to the blood flow direction of human blood vessels; and a second sensor group disposed on the wristband body, the second sensor group and the first sensor group being distributed circumferentially at intervals along the wristband body, the second sensor group including a plurality of second pulse wave sensors arranged sequentially along the width direction of the wristband body, the plurality of second pulse wave sensors corresponding one-to-one with the plurality of first pulse wave sensors; wherein, when the wristband body is worn on the left or right wrist, one of the first sensor group and the second sensor group can acquire the pulse wave of the corresponding wrist.

[0006] In one possible implementation, the number of the plurality of first pulse wave sensors and the number of the second pulse wave sensors are each at least three.

[0007] In one possible implementation, each of the first pulse wave sensors and the corresponding second pulse wave sensors are symmetrically arranged with respect to the central axis of the wristband body.

[0008] In one possible implementation, the pulse acquisition device further includes: a pressure regulating member disposed on the wristband body, the pressure regulating member being used to apply controllable pressure to the first sensor group and / or the second sensor group; and an elastic reset member disposed between the pressure regulating member and the first sensor group, and between the pressure regulating member and the second sensor group.

[0009] In one possible implementation, the pulse acquisition device further includes: a pressure sensor group disposed within the wristband body, the pressure sensor group including a plurality of static pressure sensors, each of the static pressure sensors being located between a first pulse wave sensor and a corresponding second pulse wave sensor, for detecting the static pressure applied by the pressure regulator to the first pulse wave sensor or the second pulse wave sensor.

[0010] In one possible implementation, the pulse acquisition device further includes: a plurality of sensor brackets, at least partially fixed to the wristband body, the plurality of sensor brackets being arranged sequentially along the width direction of the wristband body, each of the sensor brackets being provided with a set of the first pulse wave sensor, the static pressure sensor and the second pulse sensor; and a flexible circuit board disposed on the sensor brackets, the first pulse wave sensor, the second pulse wave sensor and the static pressure sensor being electrically connected to the flexible circuit board.

[0011] In one possible implementation, the sensor bracket includes: a first frame located on the side closer to the human body, the first frame having a first mounting slot and a second mounting slot arranged circumferentially along the main body of the wristband, the first mounting slot for accommodating the first pulse wave sensor, and the second mounting slot for accommodating the second pulse wave sensor; and a second frame connected to the first frame and located on the side away from the human body along the thickness direction of the main body of the wristband, the second frame having an opening for the leads of the first pulse wave sensor and the second pulse wave sensor to pass through and be electrically connected to the flexible circuit board.

[0012] In one possible implementation, the elastic reset member is located between the second frame and the pressure regulating member, and the pressure regulating member applies pressure to the first pulse wave sensor and the second pulse wave sensor through the elastic reset member.

[0013] In one possible implementation, the pressure regulating element includes an inflatable airbag that corresponds in the thickness direction of the wristband body to the first pulse wave sensor and the second pulse wave sensor.

[0014] In one possible implementation, the wristband body includes: a lower wristband shell for conforming to the human wrist; a middle wristband shell fixedly connected to the lower wristband shell, the middle wristband shell for fixing the sensor bracket, the elastic reset member, and the pressure adjustment member to the lower wristband shell; and an upper wristband shell fixedly connected to the lower wristband shell for covering the flexible circuit board.

[0015] Secondly, embodiments of this application also provide a pulse wave acquisition method, comprising: acquiring multiple measured pulse wave signals output by at least three pulse wave sensors in a pulse wave sensor group, wherein the at least three pulse wave sensors are arranged sequentially along the blood flow direction of the target detection artery, and each measured pulse wave signal includes a vibration interference signal, wherein the vibration interference signal is generated by an adjacent pulse wave sensor and a next-next-next pulse wave sensor; removing the vibration interference signal from the measured pulse wave signals according to a pre-set adjacent channel transfer function and a next-next-next channel transfer function, wherein the adjacent channel transfer function is used to characterize the degree of vibration interference generated by the adjacent pulse wave sensor, and the next-next-next channel transfer function is used to characterize the degree of vibration interference generated by the next-next-next pulse wave sensor; and outputting multiple target pulse wave signals after eliminating the vibration interference signal.

[0016] In one possible implementation, the pulse wave acquisition method further includes: calibrating the adjacent channel transfer function and the next adjacent channel transfer function; constructing an interference suppression algorithm model based on the adjacent channel transfer function and the next adjacent channel transfer function, wherein the interference suppression algorithm model is used to linearly combine the at least three pulse wave signals into at least three target pulse wave signals, and the combination coefficients are determined by the adjacent channel transfer function and the next adjacent channel transfer function.

[0017] In one possible implementation, removing the vibration interference signal from the pulse wave signal according to a pre-defined adjacent channel transmission function and a next adjacent channel transmission function includes: inputting the at least three pulse wave signals into the interference suppression algorithm model to remove the vibration interference signal.

[0018] In one possible implementation, inputting the at least three pulse wave signals into the interference suppression algorithm model to remove the vibration interference signal includes: converting the at least three pulse wave signals from the time domain to the frequency domain to obtain a frequency domain signal; determining frequency domain filtering coefficients based on the adjacent channel transfer function and the next adjacent channel transfer function; filtering the frequency domain signal using the frequency domain filtering coefficients to remove the vibration interference component; and converting the filtered signal from the frequency domain to the time domain to obtain the at least three target pulse wave signals.

[0019] Thirdly, embodiments of this application also provide a pulse wave acquisition device, comprising: a wristband body for wearing on the left or right wrist of a human body; a first sensor group disposed on the wristband body, including a plurality of first pulse wave sensors arranged sequentially along the width direction of the wristband body, the width direction of the wristband body corresponding to the blood flow direction of human blood vessels; a second sensor group disposed on the wristband body, the second sensor group and the first sensor group being distributed circumferentially at intervals along the wristband body, the second sensor group including a plurality of second pulse wave sensors arranged sequentially along the width direction of the wristband body, the plurality of second pulse wave sensors corresponding one-to-one with the plurality of first pulse wave sensors; wherein, when the wristband body is worn on the left or right wrist, one of the first sensor group and the second sensor group can acquire the pulse of the corresponding wrist; a processor connected to the first sensor group and the second sensor group, the processor being configured to execute the pulse wave acquisition method in any possible implementation of the second aspect of this application, wherein the pulse wave sensor group is the first sensor group or the second sensor group.

[0020] The pulse wave acquisition device provided in this application embodiment uses a first sensor group and a second sensor group arranged circumferentially at intervals on the wristband body. Both sensor groups are arranged sequentially along the width direction (blood flow direction). When the wristband body is worn on the left wrist, one of the first and second sensor groups is aligned with the radial artery of the left hand, enabling the acquisition of pulse waves from the left wrist. When the same wristband body is worn on the right wrist, one of the first and second sensor groups can be aligned with the radial artery of the right hand, enabling the acquisition of pulse waves from the right wrist. Since the fixed positions of the two sensor groups on the wristband body are determined, users can switch between wearing the wristband on their left and right wrists without adjusting the direction or rotating the wristband body; switching is completed simply by wearing the wristband. This simplifies the user's operation and improves the ease of use of the pulse wave acquisition device.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a pulse wave acquisition device provided in an embodiment of this application; Figure 2 This is one of the partial structural schematic diagrams of a pulse wave acquisition device provided in an embodiment of this application; Figure 3 A second partial structural schematic diagram of a pulse wave acquisition device provided in an embodiment of this application; Figure 4 A third partial structural schematic diagram of a pulse wave acquisition device provided in this application embodiment; Figure 5 A fourth partial structural schematic diagram of a pulse wave acquisition device provided in the embodiments of this application; Figure 6 Fifth partial structural schematic diagram of a pulse wave acquisition device provided in the embodiments of this application; Figure 7 This is a flowchart illustrating a pulse wave acquisition method provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 1-Pulse wave acquisition device; 10-Wristband body; 20-First sensor group; 201-First pulse wave sensor; 30-Second sensor group; 301-Second pulse wave sensor; 40-Static pressure sensor; 50-Sensor bracket; 501-First frame; 5011-First mounting slot; 5012-Second mounting slot; 502-Second frame; 503-Cover; 60-Flexible circuit board. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0027] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0028] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0029] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0030] Human pulse waves contain a wealth of physiological information. For example, Tibetan medicine assesses a person's health by palpating the radial artery pulse wave. In clinical practice, doctors use their index, middle, and ring fingers to press on the radial artery at the wrist to perform the test.

[0031] Pulse wave acquisition devices in related technologies typically employ sensor arrays for signal acquisition, with sensors arranged sequentially along the palm creases towards the elbow. However, due to limitations in matching the structural dimensions of flexible piezoelectric sensors with their optimal output amplitude, a single pulse wave sensor array can only achieve optimal detection when worn on one hand. When it is necessary to acquire the pulse wave from the other wrist, the sensor array must be rotated 180° in the horizontal plane to realign with the radial artery of the other wrist.

[0032] The aforementioned rotation operation not only increases the difficulty of wearing the pulse wave acquisition device and reduces its comfort, but also causes the relative position of the sensor array and the blood vessel to flip, thereby increasing the hardware and software complexity of the signal processing module and affecting the stability and consistency of the pulse wave acquisition device.

[0033] Based on this, this application proposes a pulse wave acquisition device and acquisition method to solve the above-mentioned problems existing in the prior art.

[0034] like Figure 1 As shown, the pulse wave acquisition device 1 provided in this application includes a wristband body 10, a first sensor group 20 and a second sensor group 30.

[0035] The wristband body 10 is a band-shaped structure that can wrap around the left or right wrist of a person. The wristband body 10 provides a mounting base for internal components and conforms to the surface of the wrist when worn. The wristband body 10 has length, width, and thickness. The length of the wristband body 10 is used to wrap around the wrist and forms the circumference of the wristband body 10, i.e., the Y direction in the figure. The width of the wristband body 10 corresponds to the blood flow direction of the blood vessels in the human body, i.e., the direction extending from the arm to the palm. Figure 1 The thickness of the wristband body 10 is the distance from the side of the wristband body 10 that is in contact with the skin of the human wrist to the side that is away from the human body.

[0036] The first sensor group 20 is disposed on the wristband body 10. The first sensor group 20 includes a plurality of first pulse wave sensors 201.

[0037] The width of the wristband body 10 corresponds to the blood flow direction of the human blood vessels, that is, the direction extending from the palm to the arm. When the wristband body 10 is worn on the wrist, multiple first pulse wave sensors 201 are arranged sequentially along the blood flow direction, corresponding to different positions of the radial artery in the human body.

[0038] In one specific implementation, the plurality of first pulse wave sensors 201 may include three first pulse wave sensors 201, which correspond to the three positions of "cun", "guan" and "chi" in Tibetan medicine pulse diagnosis. Among them, the cun position is close to the base of the palm, the chi position is close to the arm, and the guan position is located between the cun and chi positions.

[0039] The first pulse wave sensor 201 can be a flexible piezoelectric sensor, such as a polyvinylidene fluoride (PVDF) piezoelectric film sensor. When the radial artery pulsates, the vibration of the blood vessel wall is transmitted through the skin to the first pulse wave sensor 201, causing the film of the first pulse wave sensor 201 to deform and generate an electrical signal corresponding to the pulse wave pressure. Flexible piezoelectric sensors have good flexibility and sensitivity, and can adapt to the flexibility of human skin to accurately acquire pulse wave signals.

[0040] The second sensor group 30 is disposed on the wristband body 10. The second sensor group 30 and the first sensor group 20 are distributed circumferentially around the wristband body 10. Circumferentially refers to the direction around the wrist. With the central axis in the width direction of the wrist as the dividing line, when the wristband body 10 is worn on the wrist, the first sensor group 20 is located on one side of the wrist, and the second sensor group 30 is located on the opposite side of the wrist, with a certain distance between them circumferentially.

[0041] The second sensor group 30 includes a plurality of second pulse wave sensors 301 arranged sequentially along the width direction of the wristband body 10. The plurality of second pulse wave sensors 301 are arranged sequentially along the blood flow direction and correspond to different positions of the radial artery of the human body.

[0042] In one specific implementation, the second sensor group 30 also includes three second pulse wave sensors 301, corresponding to the cun, guan, and chi positions respectively. The second pulse wave sensors 301 have the same structure as the first pulse wave sensor 201, both being flexible piezoelectric sensors, and their working principles are the same, which will not be described in detail here.

[0043] The first sensor group 20 and the second sensor group 30 are distributed circumferentially at intervals, and a plurality of first pulse wave sensors 201 correspond one-to-one with a plurality of second pulse wave sensors 301. Specifically, at the same position in the width direction (e.g., the cun position), one of the first pulse wave sensors 201 in the first sensor group 20 and one of the second pulse wave sensors 301 in the second sensor group 30 are arranged circumferentially opposite each other, located on opposite sides of the wrist, and both are used to detect the pulse wave at the wrist cun position.

[0044] When the wristband body 10 is worn on the left wrist, one of the first sensor group 20 and the second sensor group 30 can collect the pulse wave of the left wrist. Since the first sensor group 20 and the second sensor group 30 are fixed in different positions in the circumferential direction, one of the sensor groups will naturally align with the radial artery of the left hand. When the user wears the wristband body 10 on their left wrist, the sensor group corresponding to the radial artery of the left hand in the first sensor group 20 and the second sensor group 30 can collect the pulse wave signal of the left wrist. For example, the pulse wave signal of the left wrist can be collected by the first sensor group 20 at this time.

[0045] When the wristband body 10 is worn on the right wrist, there is no need to flip it. One of the first sensor group 20 and the second sensor group 30 can collect the pulse wave of the right wrist. Since the fixed positions of the first sensor group 20 and the second sensor group 30 in the circumferential direction are determined, when the user wears the same wristband body 10 on their right wrist, the other sensor group will naturally align with the radial artery of the right wrist to collect the pulse wave signal. For example, the second sensor group 30 can collect the pulse wave signal of the right wrist at this time.

[0046] It should be noted that "no need to flip the wristband body 10" can be understood as follows: when the user switches the pulse wave acquisition device 1 from the left wrist to the right wrist, it is not necessary to rotate the wristband body 10 180° in the horizontal plane, nor is it necessary to change the relative orientation of the wristband body 10 and the wrist. The user only needs to remove the wristband body 10 from the left wrist and wear it directly on the right wrist. In other words, the wearing direction of the wristband body 10 remains unchanged when switching between the left and right wrists.

[0047] It is understandable that by reasonably setting the circumferential spacing between the first sensor group 20 and the second sensor group 30, it can be ensured that when the wristband body 10 is worn on the left or right wrist, there is always one set of sensors aligned with the radial artery.

[0048] Specifically, the radial arteries in the left and right wrists are roughly symmetrical in the circumferential direction. When the wristband body 10 is worn on the left wrist, the radial artery is located on the radial side of the left wrist near the thumb; when the wristband body 10 is worn on the right wrist, the radial artery is located on the symmetrical side of the wrist. By circumferentially spacing the first sensor group 20 and the second sensor group 30, and matching this circumferential spacing with the circumferential spacing of the radial arteries in the left and right wrists, it is possible to achieve the following: when the wristband body 10 is worn on the left wrist, the first sensor group 20 is aligned with the radial artery of the left wrist; without changing the wearing direction, when the wristband body 10 is worn on the right wrist, the second sensor group 30 is aligned with the radial artery of the right wrist.

[0049] During wear, both the first sensor group 20 and the second sensor group 30 can be in standby mode, simultaneously acquiring signals. However, only when one sensor group is aligned with the radial artery will the acquired pulse wave signal have a larger amplitude and clearer waveform; while the other sensor group, which is not aligned with the radial artery, will acquire a signal with a smaller amplitude or no obvious waveform. The signal processing unit in the pulse wave acquisition device 1 receives the pulse wave signals output by the two sensor groups. By comparing the amplitude or waveform characteristics of the two pulse wave signals, it can identify the sensor group aligned with the radial artery and process the signal output by that sensor group as a valid pulse wave signal, while the signal from the other sensor group is ignored or used as a reference signal.

[0050] For example, when the wristband body 10 is worn on the left wrist, the first sensor group 20 is aligned with the radial artery of the left hand. At this time, the signal amplitude of the first sensor group 20 is large and the waveform is clear. The second sensor group 30 is located on the opposite side of the wrist and is not aligned with the radial artery. Its output signal amplitude is small or there is no obvious waveform. The signal processing unit identifies the first sensor group 20 as the effective acquisition channel by comparing the amplitude of the two sets of pulse wave signals. The signal output by the first sensor group 20 is used as the pulse wave signal of the left wrist. The signal output by the second sensor group 30 is not involved in the pulse wave analysis. The second sensor group 30 can be stopped from acquiring data or enter a low-power standby state to reduce power consumption and data volume.

[0051] Furthermore, if a user accidentally flips the wristband body 10 onto the other wrist during the wrist-switching process, one of the first sensor group 20 and the second sensor group 30 can still be aligned with the radial artery of the other wrist.

[0052] When the user wears the wristband body 10 on their left wrist in a normal orientation, the first sensor group 20 is aligned with the radial artery of the left hand. When the user removes the wristband body 10 from their left wrist and accidentally flips it over to wear on their right wrist, the flip causes the positions of the first sensor group 20 and the second sensor group 30 to interchange. The second sensor group 30, which was originally located on one side, flips to the other side. At this time, the first sensor group 20 is still aligned with the radial artery of the right hand. The signal output by the first sensor group 20 has a larger amplitude and a clearer waveform, while the signal output by the second sensor group 30 has a smaller amplitude. By comparing the amplitude or waveform characteristics of the two sets of signals, the signal processing unit automatically identifies the first sensor group 20 as the effective acquisition channel and uses the signal output by the first sensor group 20 as the pulse wave signal of the right wrist. The signal output by the second sensor group 30 is not included in the pulse wave analysis or is no longer acquired.

[0053] Therefore, regardless of whether the user flips the wristband body 10, since the first sensor group 20 and the second sensor group 30 are distributed circumferentially, there is always a set of sensors that can be aligned with the radial artery of the wrist. The signal processing unit can automatically identify and select the effective signal channel. The user does not need to pay attention to the wearing direction of the wristband body 10, which further improves the convenience of using the pulse wave acquisition device 1.

[0054] Thus, the pulse wave acquisition device 1 provided in this application embodiment, by setting a first sensor group 20 and a second sensor group 30 distributed circumferentially on the wristband body 10, with both groups of sensors arranged sequentially along the width direction (blood flow direction), allows one of the first sensor group 20 and the second sensor group 30 to align with the radial artery of the left hand when the wristband body 10 is worn on the left wrist, enabling the acquisition of the pulse wave of the left wrist. When the same wristband body 10 is worn on the right wrist, one of the first sensor group 20 and the second sensor group 30 can align with the radial artery of the right hand, enabling the acquisition of the pulse wave of the right wrist. Since the fixed positions of the two groups of sensors on the wristband body 10 are determined, when switching between the left and right wrists, the user does not need to adjust the direction of the wristband body 10 or rotate the wristband body 10; the switching can be completed simply by wearing the wristband, simplifying the user's operation steps and improving the ease of use of the pulse wave acquisition device 1.

[0055] In some embodiments, the number of the plurality of first pulse wave sensors 201 and the plurality of second pulse wave sensors 301 are each at least three.

[0056] Specifically, the number of the plurality of first pulse wave sensors 201 and the plurality of second pulse wave sensors 301 are each three. For example, the first sensor group 20 includes three first pulse wave sensors 201, arranged sequentially along the width direction of the wristband body 10, corresponding to the cun, guan, and chi positions of the radial artery. The second sensor group 30 includes three second pulse wave sensors 301, also arranged sequentially along the width direction of the wristband body 10, corresponding to the cun, guan, and chi positions.

[0057] In other embodiments, the number of sensors in the first sensor group 20 and the second sensor group 30 can be set to five. For example, the five first pulse wave sensors 201 are arranged sequentially along the width of the wristband body 10, corresponding to the five positions of cun-shang (upper cun), cun-guan (lower cun), chi-chi (lower cun), and chi-xia (lower cun). The cun-shang position is located on the side of the cun position closer to the palm, and the chi-xia position is located on the side of the chi position closer to the arm. Similarly, the five second pulse wave sensors 301 are arranged sequentially along the width of the wristband body 10, corresponding to the five positions of cun-shang (upper cun), cun-guan (lower cun), chi-chi (lower cun), and chi-xia (lower cun). By setting five sensors, richer pulse wave information can be collected. For example, collecting the pulse wave at the cun-shang position can obtain more information about the proximal end of the blood vessel, and collecting the pulse wave at the chi-xia position can obtain more information about the distal end of the blood vessel, thereby providing more comprehensive data support for clinical diagnosis.

[0058] In some embodiments, each first pulse wave sensor 201 and the corresponding second pulse wave sensor 301 are symmetrically arranged relative to the central axis of the wristband body 10.

[0059] like Figure 1 As shown, the wristband body 10 has a central axis oo along its circumference, which divides the wristband body 10 into two symmetrical parts. The first pulse wave sensor 201 in the first sensor group 20 and the corresponding second pulse wave sensor 301 in the second sensor group 30 (i.e., two sensors located at the same width position, such as the first pulse wave sensor 201 at the inch position and the second pulse wave sensor 301 at the inch position) are symmetrically arranged with respect to this central axis.

[0060] When the wristband body 10 is worn on the left wrist, the first sensor group 20 is located on the radial side of the wrist (the side closer to the thumb), aligned with the radial artery of the left hand. Because the first pulse wave sensor 201 and the corresponding second pulse wave sensor 301 are symmetrical about the central axis, when the wristband body 10 is worn on the right wrist, the second sensor group 30 is located precisely on the radial side of the right wrist, aligned with the radial artery of the right hand. This symmetrical design ensures that regardless of whether the wristband body 10 is worn on the left or right wrist, there is always a set of sensors that can be aligned with the radial artery of the wrist being worn.

[0061] Thus, by symmetrically arranging the corresponding pair of first pulse wave sensors 201 and second pulse wave sensors 301 relative to the central axis of the wristband body 10, the first sensor group 20 and the second sensor group 30 are structurally mirror images of each other. When the user switches the wristband body 10 from the left wrist to the right wrist, due to the symmetrical design, the second sensor group 30, which was originally aligned with the radial artery on the left wrist, is naturally aligned with the radial artery on the right wrist, without requiring additional adjustment from the user. This simplifies user operation and also ensures the alignment accuracy of the sensor groups with the radial artery when collecting data from both hands.

[0062] In some embodiments, the pulse acquisition device further includes a pressure regulating element. The pressure regulating element is disposed within the wristband body 10. The pressure regulating element is used to apply controllable pressure to the first sensor group 20 and / or the second sensor group 30.

[0063] The pressure adjustment component can be an inflatable cuff. The inflatable cuff is strip-shaped and has a sealed inflation chamber inside. The inflatable cuff is equipped with an air tube interface, which can be exposed outside the wristband body 10 for connection to an external inflation mechanism. The inflatable cuff is arranged circumferentially along the wristband body 10, covering the area where the first sensor group 20 and the second sensor group 30 are located. When the external inflation mechanism inflates the cuff with gas, the cuff expands, applying pressure towards the wrist. By controlling the inflation volume, the pressure applied to the first sensor group 20 and / or the second sensor group 30 can be adjusted. When the air pressure inside the inflatable cuff increases, the pressure applied to the first sensor group 20 and / or the second sensor group 30 decreases; when the air pressure inside the inflatable cuff decreases, the pressure applied to the first sensor group 20 and / or the second sensor group 30 decreases. Through phased pressure increases, the three pressure levels of "superficial, middle, and deep" in Tibetan medicine pulse diagnosis can be simulated, thereby finding the optimal pressure point with the largest pulse amplitude.

[0064] In some embodiments, the pressure regulating member includes a first pressure regulating part and a second pressure regulating part. The first pressure regulating part is disposed within the wristband body 10 and located on the side of the first sensor group 20 opposite to the wrist, for applying controllable pressure to the first sensor group 20. The second pressure regulating part is disposed within the wristband body 10 and located on the side of the second sensor group 30 opposite to the wrist, for applying controllable pressure to the second sensor group 30.

[0065] In this embodiment, the first pressure regulating unit and the second pressure regulating unit can be independent first and second inflatable airbags, respectively. The first and second inflatable airbags are independent of each other, each having its own independent air tube interface for connection to an external inflation mechanism. The first inflatable airbag covers the area where the first sensor group 20 is located, and the second inflatable airbag covers the area where the second sensor group 30 is located.

[0066] When the wristband body 10 is worn on the left wrist, the first sensor group 20 is aligned with the radial artery of the left hand. At this time, only the first inflatable bladder can be inflated, so that the first sensor group 20 is in close contact with the radial artery of the left hand to collect the pulse wave of the left hand; the second inflatable bladder remains inflated, and the second sensor group 30 has low or no contact pressure with the skin of the wrist. When the wristband body 10 is worn on the right wrist, the second sensor group 30 is aligned with the radial artery of the right hand. At this time, only the second inflatable bladder can be inflated, so that the second sensor group 30 is in close contact with the radial artery of the right hand to collect the pulse wave of the right hand; the first inflatable bladder remains inflated.

[0067] In some embodiments, the pressure regulating element may be a separate inflatable airbag. The inflatable airbag corresponds to the first sensor group 20 and the second sensor group 30 in the thickness direction of the wristband body 10, that is, the projection of the inflatable airbag in the thickness direction of the wristband body 10 covers the area where the first sensor group 20 and the second sensor group 30 are located.

[0068] In some embodiments, the pulse acquisition device further includes a resilient reset member. The resilient reset member is disposed between the pressure regulating member and the first sensor group 20, and between the pressure regulating member and the second sensor group 30.

[0069] The elastic reset element can be a sponge layer. The elastic reset element is arc-shaped, adapted to the shape of the wristband body 10, and covers the first sensor group 20 and the second sensor group 30 on the side opposite to the wrist. The pressure adjustment element is located above the sponge layer.

[0070] When the pressure regulator inflates, it applies pressure to the elastic reset member, causing the elastic reset member to compress. The elastic reset member transmits this pressure to the first sensor group 20 and the second sensor group 30, ensuring a tight fit between the first pulse wave sensor 201 and the second pulse wave sensor 301 and the wrist skin. Because the elastic reset member is elastic, its compression deformation absorbs uneven components of the pressure applied by the pressure regulator, resulting in more even force distribution on the first sensor group 20 and the second sensor group 30. When the pressure regulator deflates, the elastic reset member gradually returns to its original shape, providing a rebound force to the first sensor group 20 and the second sensor group 30, causing them to separate from the wrist skin.

[0071] By setting a pressure regulator, controllable pressure can be applied to the first sensor group 20 and the second sensor group 30. The "controllable pressure" can be a phased pressure. By applying pressure in stages, the three pressure levels of "superficial, middle, and deep" in Tibetan medicine pulse diagnosis can be simulated to find the optimal pressure point with the largest pulse wave amplitude, thereby improving the accuracy and reliability of pulse wave acquisition.

[0072] Thus, by incorporating an elastic reset component, on the one hand, it provides elastic support when the pressure regulator applies pressure, allowing the first sensor group 20 and the second sensor group 30 to adaptively conform to the irregular geometric shape of the wrist; on the other hand, it provides rebound force when the pressure regulator depressurizes, allowing the sensor groups to separate from the wrist skin, making it easier for the user to remove the wristband body 10. The combined use of the pressure regulator and the elastic reset component enables automatic pressure application and adaptive fitting of the pulse wave acquisition device 1.

[0073] In some embodiments, the pulse acquisition device further includes a pressure sensor array. The pressure sensor array is disposed within the wristband body 10.

[0074] The pressure sensor group includes multiple static pressure sensors 40, each located between a first pulse wave sensor 201 and a corresponding second pulse wave sensor 301. The static pressure sensor 40 is used to detect the static pressure applied to the first pulse wave sensor 201 or the second pulse wave sensor 301 by a pressure regulator. Specifically, the static pressure sensor 40 can be a piezoresistive pressure sensor. The static pressure sensor 40 has four pins: two signal outputs and two power inputs.

[0075] For example, taking the cun position as an example: the first pulse wave sensor 201 and the second pulse wave sensor 301 of the cun position are arranged opposite each other in the circumferential direction, and a static pressure sensor 40 of the cun position is arranged between them. Similarly, the guan position and chi position are also respectively provided with corresponding static pressure sensors 40. The static pressure sensor 40 is located in the middle of the first pulse wave sensor 201 and the second pulse wave sensor 301, and is approximately flush with the first pulse wave sensor 201 and the second pulse wave sensor 301 along the width direction of the wristband body 10.

[0076] When the pressure regulator inflates, it applies pressure to the first sensor group 20 and the second sensor group 30 via an elastic reset member. This pressure is transmitted to the first pulse wave sensor 201, the second pulse wave sensor 301, and the static pressure sensor 40 located between them. Since the static pressure sensor 40 is located between the first pulse wave sensor 201 and the second pulse wave sensor 301, the pressure value it detects reflects the static pressure applied by the pressure regulator to the two sensor groups. When the inflation amount of the pressure regulator increases, the pressure value detected by the static pressure sensor 40 increases; when the inflation amount of the pressure regulator decreases, the pressure value detected by the static pressure sensor 40 decreases. The signal processing unit receives the static pressure signal output by the static pressure sensor 40. During the phased pressurization process of the pressure regulator, the signal processing unit collects the static pressure value in real time and controls the inflation amount of the pressure regulator according to the static pressure value to make the static pressure reach the preset target value.

[0077] Thus, by setting static pressure sensors 40, and placing each static pressure sensor 40 between a first pulse wave sensor 201 and a corresponding second pulse wave sensor 301, the static pressure applied to the sensor group by the pressure regulator can be detected in real time. This allows for precise control of the pressure regulator's pressurization process, avoiding pressurization errors caused by experience or indirect judgment. The pressure value detected by the static pressure sensor 40 enables closed-loop control of the pressure regulator: when the pressure value is lower than the target value, the inflation volume is increased; when the pressure value is higher than the target value, the inflation volume is decreased or deflation occurs. When the pressure reaches the target value, the amplitude of the pulse wave signal is at its maximum, thereby obtaining a stable pulse wave signal.

[0078] In some embodiments, such as Figure 1 and Figure 2 As shown, the pulse acquisition device also includes multiple sensor supports 50. The number of sensor supports 50 corresponds to the number of the first pulse wave sensor 201 and the second pulse wave sensor 301. The multiple sensor supports 50 are arranged sequentially along the width direction of the wristband body 10. Each sensor support 50 is provided with a set of first pulse wave sensor 201, static pressure sensor 40, and second pulse sensor. As mentioned above, if the number of first pulse wave sensors 201 is three or five, then the number of sensor supports 50 is three or five. Figure 3 As shown, each sensor bracket 50 includes a first frame 501 and a second frame 502.

[0079] like Figure 4 and Figure 5 As shown, the first frame 501 is located on the side closest to the human body. The first frame 501 is provided with a first mounting groove 5011 and a second mounting groove 5012, which are arranged at intervals along the circumference of the wristband body 10, and are respectively used to accommodate the first pulse wave sensor 201 and the second pulse wave sensor 301.

[0080] In some embodiments, the first frame 501 is further provided with a third mounting slot, which is located between the first mounting slot 5011 and the second mounting slot 5012, for accommodating the static pressure sensor 40 in the pressure sensor group.

[0081] The first mounting slot 5011 and the second mounting slot 5012 provide mounting and deformation space for the first pulse wave sensor 201 and the second pulse wave sensor 301. When the pressure regulating member applies pressure to the pulse wave sensor through the elastic reset member, the pulse wave sensor can deform within the corresponding mounting slot, thereby generating a stronger electrical signal.

[0082] The first frame 501 has ear-like structures on both sides for mounting the sensor bracket 50 on the wristband body 10 so that it will not fall off during use.

[0083] The second frame 502 is fastened to the first frame 501 and is located on the side away from the human body along the thickness direction of the wristband body 10. The second frame 502 is provided with multiple openings for the leads of the first pulse wave sensor 201 and the second pulse wave sensor 301 to pass through, and for accommodating the static pressure sensor 40.

[0084] In some embodiments, such as Figure 3 and Figure 5 As shown, the sensor bracket 50 also includes a cover 503. The cover 503 covers the first frame 501, so that its non-working surface is not exposed, but may include a groove to expose the first pulse wave sensor 201 and the second pulse wave sensor 301.

[0085] In some embodiments, such as Figure 6 As shown, the pulse wave acquisition device 1 also includes a flexible circuit board 60. The flexible circuit board 60 is disposed on the sensor bracket 50. The flexible circuit board 60 can be disposed in the receiving space between the first frame 501 and the second frame 502, or it can be disposed on the back of the second frame 502 (on the side near the elastic reset member). The specific position is determined according to the actual assembly requirements.

[0086] The flexible circuit board 60 may include multiple branches: a first branch has multiple pads for connecting a first pulse wave sensor 201; a second branch has multiple pads for connecting a second pulse wave sensor 301; and a third branch has multiple pads for connecting a static pressure sensor 40. The pads of each branch are respectively located on the front and / or back of the flexible circuit board 60 to accommodate the sensor's lead-out direction. The other end of the flexible circuit board 60 has gold finger pads for connecting signal reading and processing circuitry.

[0087] In some embodiments, the elastic reset member is located between the second frame 502 and the pressure regulating member, which applies pressure to the first sensor group 20 and the second sensor group 30 via the elastic reset member. After the second frame 502 is fastened to the first frame 501, its surface facing away from the human body is flat and used to contact the elastic reset member. The elastic reset member covers the second frame 502 and covers the areas corresponding to the first sensor group 20 and the second sensor group 30.

[0088] Thus, by placing the elastic reset component between the second frame 502 and the pressure regulating component, the pressure regulating component indirectly applies pressure to the sensor group through the elastic reset component, making the pressure transmission more uniform and solving the problems of unstable pressure application and poor fit with the human body in the pulse wave acquisition device 1.

[0089] In some embodiments, the wristband body 10 includes a lower wristband shell, a middle wristband shell, and an upper wristband shell.

[0090] The lower shell of the wristband is designed to fit snugly against the human wrist. The lower shell is generally curved to conform to the natural shape of the human wrist. Multiple openings are provided on the lower shell according to the number of sensors. In this embodiment, the first sensor group 20 and the second sensor group 30 may each include three pulse wave sensors, and the lower shell of the wristband is provided with six openings corresponding to the mounting positions of the first pulse wave sensor 201 and the second pulse wave sensor 301, allowing the sensors to contact the skin of the wrist through the openings.

[0091] The lower housing of the wristband is used to house the sensor bracket 50. The sensor bracket 50 is hooked onto the lower housing of the wristband via hook structures on both sides, preventing it from falling off during use. Velcro fasteners are also provided on both sides of the lower housing of the wristband for securing the wristband body 10 to the patient's wrist.

[0092] The middle shell of the wristband is fixedly connected to the lower shell of the wristband, used to fix the sensor bracket 50, the elastic reset member, and the pressure regulating member to the lower shell of the wristband. The middle shell of the wristband is fixed to the lower shell of the wristband through a bayonet structure, fixing the sensor bracket 50 placed on the lower shell of the wristband, the elastic reset member covering the sensor bracket 50, and the pressure regulating member placed on the elastic reset member into a whole. The middle shell of the wristband is provided with an opening for the air tube of the pressure regulating member to extend out for connection with an external inflation mechanism.

[0093] The upper and lower shells of the wristband are fixedly connected to cover the flexible circuit board 60 and the wristband air tube. The upper and lower shells snap together, protecting the flexible circuit board 60 internally from external interference and physical damage. An opening is provided on the side of the upper shell for the leads of the flexible circuit board 60 to extend for connection to external signal processing circuitry.

[0094] The second aspect of this application provides a pulse wave acquisition method. This method can be used with any of the pulse wave acquisition devices provided in the first aspect of this application, or it can be applied to other types of multi-sensor, multi-channel pulse wave acquisition devices. When this method is applied to any of the pulse wave acquisition devices provided in the first aspect of this application, the group of sensors in the first sensor group or the second sensor group that is in operation is the pulse wave sensor group in this method. This pulse wave acquisition method can be executed by a processor in the pulse wave acquisition device.

[0095] The pulse wave acquisition method provided in this application relates to vibration interference. Specifically, when a pulse wave sensor at a vibration source moves upward due to the force of vascular pulsation, the elastic restoring element (sponge layer) surrounding the sensor undergoes compression deformation. This compression deformation is transmitted to adjacent pulse wave sensors through the elastic restoring element, causing changes in the pressure on the adjacent sensors and a corresponding change in their film deformation, thereby generating additional interference components in the output signals of the adjacent sensors. When the vibration source moves downward, the above process is reversed. Therefore, vibration interference between sensors propagates through the deformation of the elastic restoring element, and the intensity of the interference signal is related to the amplitude of the vibration source, the distance between the sensors, and the elastic coefficient of the elastic restoring element.

[0096] Combination Figure 7 The pulse wave acquisition method provided in the second aspect of this application includes steps 701 to 703.

[0097] Step 701: Acquire multiple measured pulse wave signals output by at least three pulse wave sensors in the pulse wave sensor group. Each measured pulse wave signal includes a vibration interference signal, which is generated by the adjacent pulse wave sensor and the next adjacent pulse wave sensor.

[0098] Among them, at least three pulse wave sensors are arranged sequentially along the blood flow direction of the target detection artery.

[0099] The target artery refers to the radial artery in the human body. Blood flow direction refers to the direction in which blood flows within the artery, from the heart to the limbs. For the radial artery at the wrist, the blood flow direction is from the arm towards the palm. Pulse wave sensors are arranged sequentially along the blood flow direction, that is, along the course of the radial artery. In one specific implementation, at least three pulse wave sensors correspond to at least the cun, guan, and chi positions.

[0100] Each measured pulse wave signal includes a vibration interference signal. The vibration interference signal refers to the interference caused by vibrations generated by adjacent and next-next-adjacent pulse wave sensors on the target sensor signal. Adjacent pulse wave sensors are two sensors located next to each other. Next-next-adjacent pulse wave sensors are two sensors separated by one sensor.

[0101] When the radial artery pulsates, the vibration of the vessel wall is transmitted to the sensor in direct contact with it, causing the sensor to generate an electrical signal. Simultaneously, this vibration propagates through the elastic reset element and sensor support within the wristband to other sensors, causing them to also generate electrical signals; this latter signal is the vibration interference signal. Therefore, the actual measured pulse wave signal acquired by each sensor includes not only the true pulse wave signal at the corresponding sensor location but also the vibration interference signals transmitted from adjacent and next-next-adjacent sensors.

[0102] Step 702: Remove vibration interference signals from the measured pulse wave signals according to the pre-set adjacent channel transmission function and the next adjacent channel transmission function.

[0103] Among them, the adjacent channel transfer function is used to characterize the degree of vibration interference generated by adjacent pulse wave sensors, and the next adjacent channel transfer function is used to characterize the degree of vibration interference generated by the next adjacent pulse wave sensor.

[0104] For example, for ease of description below, the three pulse wave sensors arranged in sequence will be referred to as sensor B, sensor A, and sensor C. Sensor B, sensor A, and sensor C can correspond to the cun, guan, and chi positions, respectively, to collect the pulse wave signal of the user's wrist. Since sensor B is adjacent to sensor A, and sensor C is adjacent to sensor A, the vibration interference between sensor B and sensor A, and between sensor C and sensor A, is considered adjacent channel interference. Since sensor B and sensor C are not adjacent (separated by sensor A), the vibration interference between sensor B and sensor C is considered secondary adjacent channel interference.

[0105] Let the actual pulse wave signals from the three sensors (i.e., the target pulse wave signal ultimately desired) be as follows: , , The actual measured pulse wave signals collected were as follows: , , Adjacent channel transfer function and next adjacent channel transfer function It is determined in advance through the calibration process.

[0106] Based on the propagation law of vibration interference, the actual measured pulse wave signal and the true pulse wave signal have the following relationship: The measured pulse wave signal actually acquired by sensor B It consists of three parts: the actual pulse wave signal of sensor B itself. Vibration interference signal transmitted by sensor A through adjacent channels Vibration interference signal transmitted by sensor C through the next adjacent channel Among them, symbols This represents the convolution operator.

[0107] The actual measured pulse wave signal acquired by sensor A It consists of three parts: the actual pulse wave signal of sensor A itself. Vibration interference signal transmitted by sensor B through adjacent channels Vibration interference signal transmitted by sensor C through adjacent channels .

[0108] The measured pulse wave signal actually acquired by sensor C It consists of three parts: the actual pulse wave signal of sensor C itself. Vibration interference signal transmitted by sensor A through adjacent channels Vibration interference signal transmitted by sensor B through the next adjacent channel .

[0109] The above relationship indicates that the measured pulse wave signal actually acquired by each sensor contains its own true pulse wave signal and components superimposed by vibration interference from other sensors. By solving the system of equations describing the above relationship, the vibration interference component can be separated from the actually acquired measured pulse wave signal to obtain the true pulse wave signal, i.e., the target pulse wave signal.

[0110] In one specific implementation, the above solution process can be achieved through linear combination, that is, each real pulse wave signal can be represented as a linear combination of three actual acquired signals, with the combination coefficients being determined by... and Confirmed. In another specific implementation, the above solution process can be completed in the frequency domain. The time-domain signal is converted to the frequency domain through discrete Fourier transform, vibration interference components are filtered out using frequency domain filtering coefficients, and the time-domain signal is recovered through inverse Fourier transform.

[0111] Step 703: Output multiple target pulse wave signals after eliminating vibration interference signals.

[0112] The output consists of multiple target pulse wave signals processed in step 702, i.e., the real pulse wave signals. , , These target pulse wave signals have eliminated vibration interference from adjacent and next-nearest sensors, and can accurately reflect the true pulse wave characteristics at the corresponding sensor locations.

[0113] Thus, the pulse wave acquisition method provided in this application acquires signals from at least three pulse wave sensors arranged sequentially along the blood flow direction. Each signal contains vibration interference generated by adjacent and next-next-adjacent sensors. A pre-defined adjacent channel transfer function is used. and next adjacent channel transfer function Vibration interference signals can be separated from the actual measured pulse wave signals collected. Because... and The vibration interference is predetermined through a calibration process, reflecting the inherent characteristics of vibration interference between sensors. Therefore, the magnitude of the vibration interference can be accurately calculated and subtracted from the acquired measured pulse wave signal. After the above processing, the output target pulse wave signal eliminates vibration interference between adjacent and next-next-adjacent sensors, improving the accuracy of the pulse wave acquisition device.

[0114] Based on the above analysis, the following embodiments quantify the propagation law of vibration interference into a mathematical expression. The signal transfer function reflects the transmission characteristics of the channel, from which the amplitude-frequency and phase-frequency characteristics of the vibration interference signal can be obtained. The degree of interference between adjacent channels is expressed using the adjacent channel transfer function. The degree of interference in the next-nearest neighbor channel is characterized by the next-nearest neighbor channel transfer function. Characterization. Based on this, the vibration disturbance expressions for single vibration sources, two vibration sources, and three vibration sources are shown below.

[0115] Proximity channel interference refers to the vibration interference signal generated when a pulse wave sensor above a vibration source vibrates vertically, causing adjacent pulse wave sensors to undergo forced displacement. When the vibration source moves upward at sensor A, the deformation of sensor A increases, and the elastic reset components around sensor A are forced to compress. Due to the symmetry of sensors B, A, and C, the proximity channel transfer functions are equal, which can be expressed by the following formula:

[0116] in, This represents the adjacent channel transfer function. The original signal is defined as... The vibration interference signal of the adjacent channel is Then, the vibration interference signal of the adjacent channel can be expressed by the following formula:

[0117] Secondary proximity channel interference refers to the vibration interference signal generated when a sensor on a vibration source vibrates vertically, causing the next nearest sensor (one sensor away) to undergo forced displacement. When the vibration source moves upward at sensor B, sensor B moves upward, increasing the deformation of sensor C, and forcing the elastic reset components around sensor C to compress. Due to the symmetry of the structure, the transfer function of secondary proximity channel interference is equal and can be expressed by the following formula:

[0118] in, Let represent the transfer function of the next nearest neighbor channel. The vibration interference signal of the next nearest neighbor channel can be expressed by the following formula:

[0119] The signal transfer function reflects the transmission characteristics of the channel, and the amplitude-frequency and phase-frequency characteristics of the vibration interference signal can be obtained from the transfer function. The transfer function between the input and output signals can be estimated using the Welch average periodogram method. Assuming the object under study is a linear time-invariant system, the input of which is the pulse wave signal at the vibration source, and the output is the vibration interference signal collected by adjacent or next-nearest sensors, the frequency characteristics of the linear time-invariant system are... .set up The input signal of the system is the pulse wave signal at the vibration source. If the system's output signal (i.e., the vibration interference signal collected by the interference sensor) is the output signal, then the transfer function is calculated using the following formula (Formula 5):

[0120] in, Input signal The power spectral density, Input signal With output signal The cross-power spectral density. When and When the information is known, the system's transfer function can be calculated using Formula 5 above, thereby obtaining the transfer functions of adjacent channels. or next adjacent channel transfer function .

[0121] To further illustrate the propagation law of vibration interference, the following example uses a single vibration source. If there is a pulse fluctuation at sensor A, and no vibration source is present at nearby sensors B and C, then sensors B and C will be forced to vibrate due to the vibration of sensor A, thus generating vibration interference signals. Since sensors B and C are both adjacent to sensor A, the vibration interference experienced by sensors B and C belongs to the category of proximity channel interference, as expressed in Formula Six below:

[0122] If a pulse wave fluctuation exists at sensor B, and there is no vibration source at the nearby sensors A and C, then sensors A and C will be forced to vibrate due to the vibration of sensor B, thus generating vibration interference signals. Since sensor A is adjacent to sensor B, the vibration interference experienced by sensor A belongs to the adjacent channel interference; since sensor C is not adjacent to sensor B (separated by sensor A), the vibration interference experienced by sensor C belongs to the secondary adjacent channel interference. The vibration interference signals at sensors A and C are expressed by the following formula (Formula 7):

[0123] If a pulse wave fluctuation exists at sensor C, and there is no vibration source at nearby sensors B and A, then sensors A and B will be forced to vibrate due to the vibration of sensor C, thus generating vibration interference signals. Since sensor A is adjacent to sensor C, the vibration interference experienced by sensor A belongs to the adjacent channel interference; since sensor B is not adjacent to sensor C (separated by sensor A), the vibration interference experienced by sensor B belongs to the secondary adjacent channel interference. The vibration interference signals at sensors A and B are expressed by the following formula:

[0124] To further illustrate the propagation law of vibration interference, the following example uses two vibration sources. If pulse wave fluctuations exist at sensor A and sensor B, and there is no vibration source at sensor C, then sensor A and sensor B are mutually affected by adjacent channel interference, while sensor C is affected by adjacent channel interference from sensor A and second-nearest channel interference from sensor B. The signal expressions for each sensor are given by Formula Nine below:

[0125] If pulse wave fluctuations exist at sensors A and C, and there is no vibration source at sensor B, then sensors A and C are mutually affected by adjacent channel interference, while sensor B is affected by adjacent channel interference from sensor A and second-nearest channel interference from sensor C. The signal expressions for each sensor are given by the following formula:

[0126] If pulse wave fluctuations exist at sensors B and C, and there is no vibration source at sensor A, then sensors B and C are secondary proximity channel interference sources, and sensor A is affected by proximity channel interference from sensors B and C. The signal expressions for each sensor are given by Formula 11 below:

[0127] It should be noted that, in the above, sensor A is simultaneously affected by the adjacent channel interference of both sensor B and sensor C, so its expression contains two interference components; the interference between sensor B and sensor C is secondary adjacent channel interference, and neither sensor B nor sensor C has any adjacent channel interference from the other, so their expressions only contain their own true signals and the secondary adjacent channel interference from the other.

[0128] To further illustrate the propagation law of vibration interference under complex conditions, the following example uses three vibration sources.

[0129] If pulse wave fluctuations exist simultaneously at sensors A, B, and C, then sensor A is affected by adjacent channel interference from sensors B and C on either side; sensor B is affected by adjacent channel interference from sensor A and second-nearest channel interference from sensor C; and sensor C is affected by adjacent channel interference from sensor A and second-nearest channel interference from sensor B. The signal expressions for each sensor are given by the following formula (Equation XII):

[0130] As can be seen from the above expressions, the equations for a single vibration source and two vibration sources are special cases of the equations for three vibration sources. When there is no vibration source at a certain location, the actual pulse wave signal at that location is used. Setting it to zero allows us to derive the corresponding forms of Formulas 6 to 1 from Formula 12. Therefore, Formula 12 can serve as a unified expression for channel interference in pulse wave acquisition devices.

[0131] In some embodiments, the pulse wave acquisition method provided in this application further includes calibration. and The steps 704 and 705, which construct the interference suppression algorithm model, can be performed before step 701.

[0132] Step 704: Calibrate the adjacent channel transmission function and the next adjacent channel transmission function.

[0133] During the calibration phase, standard vibration sources can be placed sequentially at the locations of each pulse wave sensor, applying vibration signals of known frequency and amplitude. After acquiring the output signals of each pulse wave sensor, the applied vibration signal is used as the input, and the output signal of the pulse wave sensor is used as the output. The transfer function between the input and output signals can then be estimated using Welch's average period method, thus obtaining the calibration result. and The specific values. This calibration process is completed before the pulse wave acquisition device leaves the factory or during initial use, and the determined values ​​are... and It is stored in the pulse wave acquisition device and can be directly accessed during each subsequent pulse wave acquisition.

[0134] Step 705: Construct an interference suppression algorithm model based on the adjacent channel transmission function and the next adjacent channel transmission function.

[0135] This model is used to linearly combine at least three measured pulse wave signals into at least three target pulse wave signals, and the combination coefficients are determined by the adjacent channel transfer function. and next adjacent channel transfer function Confirmed. After the interference suppression algorithm model is constructed, it is stored in the pulse wave acquisition device.

[0136] Further, step 705 includes steps 7051 to 7052: Step 7051: Establish a set of equations between the actual pulse wave signal and the target pulse wave signal.

[0137] According to the aforementioned propagation law of vibration interference (see Formula XII), the actual measured pulse wave signal and the true pulse wave signal satisfy the following set of equations:

[0138] Step 7052: Solve the system of equations to obtain the expression for the target pulse wave signal.

[0139] By solving the above system of equations, and according to the convolution transform formula, the expression for the true pulse wave signal can be obtained as follows: Formula Thirteen:

[0140] in, to Based on adjacent channel transfer function and next adjacent channel transfer function The transmission coefficients are obtained through deconvolution. The above expression is the core of the interference suppression algorithm model.

[0141] For ease of expression, Formula 13 above can be simplified to:

[0142] in, to These correspond to the terms in Formula Twelve. Formula Thirteen is a simplified expression of the constructed interference suppression algorithm model. Once the model is constructed, it is stored in the pulse wave acquisition device.

[0143] In some embodiments, the pulse wave acquisition method provided in this application further includes the following step 706: Step 706: Store the interference suppression algorithm model in the pulse wave acquisition device.

[0144] In each subsequent pulse wave acquisition (i.e. when steps 701 to 703 are executed), the interference suppression algorithm model is directly called, and at least three measured pulse wave signals are actually acquired and input into the model. The model linearly combines the input signals according to the predetermined combination coefficients and outputs at least three target pulse wave signals after eliminating vibration interference.

[0145] In some embodiments, step 702 above: removing vibration interference signals from the measured pulse wave signal according to a pre-set adjacent channel transmission function and a second adjacent channel transmission function, specifically includes: Step 7021: Input at least three pulse wave signals into the interference suppression algorithm model to remove vibration interference signals.

[0146] Specifically, the at least three measured pulse wave signals obtained in step 701 , , The input is fed into the interference suppression algorithm model constructed in step 7052. The core of this model is the deconvolution linear combination relationship described in Formula Twelve above, i.e., Formula Thirteen. The output of the model is the target pulse wave signal after eliminating vibration interference. , , In one implementation, the aforementioned deconvolution linear combination operation can be performed directly in the time domain, i.e., by performing time-domain convolution operations according to Formula 13.

[0147] In another specific implementation, to improve computational efficiency, the convolution theorem can be used to convert time-domain convolution operations into frequency-domain multiplication operations, performing equivalent calculations in the frequency domain. Further, step 7021 can specifically include: Step 70211: Convert at least three pulse wave signals from the time domain to the frequency domain to obtain frequency domain signals; Let the length of the measured pulse wave signal output by the pulse wave sensor array be N (where N represents the number of time-domain signal sampling points participating in one discrete Fourier transform). The sampling frequency is... ( The upper limit of the radial artery pulse wave vibration frequency is (representing the number of signal samples collected per unit time). ( This represents the upper limit of the effective frequency of the pulse wave signal; the human pulse wave frequency is typically below 4Hz. First, determine the number of frequency points M (M represents the number of effective frequency points to be retained in the frequency domain, used to filter out signal components above the upper limit of the vibration frequency), satisfying the following relationship:

[0148] in, The angular frequency corresponding to the upper limit of the vibration frequency. M It is an integer.

[0149] according to Discrete Fourier Transform (DFT) transforms time-domain signals (n is the time-domain sampling point number) converted to frequency-domain signal (k is the frequency domain sampling point number):

[0150] Specifically, the at least three measured pulse wave signals obtained in step 701 (i.e., the signals output by the pulse wave sensor group in the first sensor group or the second sensor group that is in working state) are converted to the frequency domain by discrete Fourier transform to obtain frequency domain signals.

[0151] In this way, the time-domain signal is transformed into the frequency domain, laying the foundation for the subsequent transformation of time-domain convolution operations into frequency-domain multiplication operations. Since the computational cost of frequency-domain multiplication operations is much lower than that of time-domain convolution operations, this transformation creates conditions for improving computational efficiency.

[0152] Step 70212: Determine the frequency domain filtering coefficients based on the adjacent channel transfer function and the next adjacent channel transfer function.

[0153] According to the pre-calibrated adjacent channel transfer function and next adjacent channel transfer function Determine the frequency domain filter coefficients. The degree of vibration interference propagated between adjacent pulse wave sensors through the elastic reset element (sponge layer) and sensor support was characterized. This characterizes the degree of vibration interference propagating between pulse wave sensors spaced one sensor apart through the aforementioned structure. The frequency domain filter coefficients and... , The relationship between them is determined by the aforementioned interference suppression algorithm model.

[0154] Based on the relationship between the input and output signals, the frequency domain filtering expression is as follows:

[0155] in, For frequency domain transfer function, based on and The calculated frequency domain filter coefficients are... .

[0156] Thus, based on pre-calibrated and The frequency domain filter coefficients have been determined. Because... and The frequency domain filter coefficients are determined through a calibration process tailored to the specific structural characteristics of the pulse wave acquisition device (such as the elastic coefficient of the elastic reset component and the circumferential spacing between sensors). Therefore, the determined frequency domain filter coefficients can adaptively match the vibration interference characteristics of different pulse wave acquisition devices, providing accurate parameters for subsequent filtering and improving the accuracy and robustness of interference suppression. Simultaneously, by appropriately setting the number of frequency domain points... M It can filter out the upper limit of vibration frequency. The above high-frequency noise fully considers the frequency characteristics of the radial artery pulse wave (usually 0.5Hz to 4Hz), which not only preserves the effective information of the pulse wave signal, but also effectively suppresses high-frequency interference.

[0157] Step 70213: Use frequency domain filtering coefficients to filter the frequency domain signal to remove vibration interference components.

[0158] Using the frequency domain filtering coefficients determined in step 70212 For frequency domain signals Filtering is performed to obtain the filtered frequency domain signal. To filter out vibration interference components, frequency domain filtering coefficients are used to filter the frequency domain signal, thus achieving the removal of vibration interference components. Since convolution operations in the time domain correspond to multiplication operations in the frequency domain, filtering can be completed by directly performing multiplication operations on the frequency domain signal, avoiding complex time-domain convolution calculations and significantly reducing the computational load.

[0159] Step 70214: Convert the filtered signal from the frequency domain back to the time domain to obtain at least three target pulse wave signals.

[0160] The filtered frequency domain signal is obtained through inverse Fourier transform. Converting back to the time domain, we obtain the time-domain expression of the output signal:

[0161] Specifically, the filtered frequency domain signal The target pulse wave signal after vibration interference is obtained by converting it back to the time domain using inverse Fourier transform. These target pulse wave signals have been freed from vibration interference from adjacent and next-next-adjacent sensors, accurately reflecting the true pulse wave characteristics at the cun, guan, and chi positions. The filtered frequency domain signal is converted back to the time domain to obtain the target pulse wave signal after vibration interference is eliminated, completing the entire interference suppression process.

[0162] Thus, through the above-described frequency domain implementation, the pulse wave acquisition method provided in this application improves computational efficiency while ensuring interference suppression, achieving a balance between computational efficiency and interference suppression accuracy. The combination of time-frequency conversion and frequency-time conversion provides a data foundation for frequency domain processing; based on pre-calibrated... and The determined frequency domain filtering coefficients ensure adaptive matching between the filtering parameters and the structural characteristics of the pulse wave acquisition device; the use of frequency domain multiplication instead of time domain convolution significantly reduces the computational load. These steps together achieve efficient and accurate vibration interference suppression. This frequency domain implementation complements the aforementioned time domain linear combination implementation, allowing users to flexibly choose according to their actual application scenarios (such as computing resources and real-time requirements), thus improving the applicability and flexibility of the pulse wave acquisition method provided in this application.

[0163] A third aspect of this application also provides a pulse wave acquisition device. In addition to including the pulse wave acquisition device provided in any embodiment of the first aspect of this application, the pulse wave acquisition device further includes a processor for executing the pulse wave acquisition method provided in the second aspect of this application.

[0164] When the wristband is worn on the left wrist, the first sensor group can be in working state. The processor acquires the measured pulse wave signals output by at least three first pulse wave sensors in the first sensor group, and executes the pulse wave acquisition method provided in the second aspect of this application to output the target pulse wave signal after eliminating vibration interference. When the wristband is worn on the right wrist, the second sensor group can be in working state. The processor acquires the measured pulse wave signals output by at least three second pulse wave sensors in the second sensor group, and executes the pulse wave acquisition method provided in the second aspect of this application to output the target pulse wave signal after eliminating vibration interference.

[0165] Thus, the pulse wave acquisition device provided in this application embodiment not only achieves the convenience of switching between left and right hands without flipping the wristband body, but also eliminates vibration interference between multi-channel pulse wave sensors, thereby improving the accuracy and reliability of pulse wave acquisition.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A pulse wave acquisition device, characterized in that, include: The main body of the wristband is for wearing on the left or right wrist of the human body; The first sensor group is disposed on the wristband body and includes a plurality of first pulse wave sensors arranged sequentially along the width direction of the wristband body, wherein the width direction of the wristband body corresponds to the blood flow direction of human blood vessels. A second sensor group is disposed on the wristband body. The second sensor group and the first sensor are distributed at intervals along the circumference of the wristband body. The second sensor group includes a plurality of second pulse wave sensors arranged sequentially along the width direction of the wristband body. The plurality of second pulse wave sensors correspond one-to-one with the plurality of first pulse wave sensors. When the wristband is worn on the left or right wrist, one of the first sensor group and the second sensor group can collect the pulse wave of the corresponding wrist.

2. The pulse wave acquisition device according to claim 1, characterized in that, The plurality of first pulse wave sensors and the number of second pulse wave sensors are each at least three; and / or Each of the first pulse wave sensor and the corresponding second pulse wave sensor is symmetrically arranged with respect to the central axis of the wristband body.

3. The pulse wave acquisition device according to claim 1, characterized in that, The pulse acquisition device also includes: A pressure regulating element is disposed on the wristband body, and the pressure regulating element is used to apply controllable pressure to the first sensor group and / or the second sensor group; An elastic reset element is disposed between the pressure regulating element and the first sensor group, and between the pressure regulating element and the second sensor group.

4. The pulse wave acquisition device according to claim 3, characterized in that, The pulse acquisition device also includes: A pressure sensor group is disposed within the wristband body. The pressure sensor group includes multiple static pressure sensors, each of which is located between a first pulse wave sensor and a corresponding second pulse wave sensor, for detecting the static pressure applied by the pressure regulator to the first pulse wave sensor or the second pulse wave sensor.

5. The pulse wave acquisition device according to claim 4, characterized in that, The pulse acquisition device also includes: Multiple sensor brackets are at least partially fixed to the wristband body. The multiple sensor brackets are arranged sequentially along the width direction of the wristband body. Each sensor bracket is provided with a set of the first pulse wave sensor, the static pressure sensor and the second pulse sensor. A flexible circuit board is disposed on the sensor bracket, and the first pulse wave sensor, the second pulse wave sensor, and the static pressure sensor are electrically connected to the flexible circuit board.

6. The pulse wave acquisition device according to claim 5, characterized in that, The sensor bracket includes: The first frame is located on the side closer to the human body. The first frame is provided with a first mounting slot and a second mounting slot arranged circumferentially along the main body of the wristband. The first mounting slot is used to accommodate the first pulse wave sensor, and the second mounting slot is used to accommodate the second pulse wave sensor. The second frame is connected to the first frame and is located on the side away from the human body along the thickness direction of the wristband body. The second frame is provided with an opening for the leads of the first pulse wave sensor and the second pulse wave sensor to pass through and be electrically connected to the flexible circuit board.

7. The pulse wave acquisition device according to claim 6, characterized in that, The elastic reset member is located between the second frame and the pressure regulating member, and the pressure regulating member applies pressure to the first pulse wave sensor and the pulse wave sensor through the elastic reset member; and / or The pressure regulating component includes an inflatable airbag, which corresponds to the first pulse wave sensor and the second pulse wave sensor in the thickness direction of the wristband body.

8. The pulse wave acquisition device according to claim 5, characterized in that, The wristband body includes: The lower shell of the wristband is designed to fit snugly against the human wrist. The wristband middle shell is fixedly connected to the wristband lower shell, and the wristband middle shell is used to fix the sensor bracket, the elastic reset member and the pressure adjustment member to the wristband lower shell; The upper shell of the wristband is fixedly connected to the lower shell of the wristband and is used to cover the flexible circuit board.

9. A method for acquiring pulse waves, characterized in that, include: Multiple measured pulse wave signals output by at least three pulse wave sensors in a pulse wave sensor group are acquired. The at least three pulse wave sensors are arranged sequentially along the blood flow direction of the target detection artery. Each measured pulse wave signal includes a vibration interference signal, which is generated by the adjacent pulse wave sensor and the next adjacent pulse wave sensor. The vibration interference signal is removed from the measured pulse wave signal according to the pre-set adjacent channel transmission function and the next adjacent channel transmission function. The adjacent channel transmission function is used to characterize the degree of vibration interference generated by adjacent pulse wave sensors, and the next adjacent channel transmission function is used to characterize the degree of vibration interference generated by the next adjacent pulse wave sensor. Output multiple target pulse wave signals after eliminating the vibration interference signal.

10. The pulse wave acquisition method according to claim 9, characterized in that, The pulse wave acquisition method further includes: Calibrate the transmission functions of adjacent channels and the next adjacent channel; An interference suppression algorithm model is constructed based on the adjacent channel transmission function and the next adjacent channel transmission function. The interference suppression algorithm model is used to linearly combine the at least three pulse wave signals into at least three target pulse wave signals, and the combination coefficients are determined by the adjacent channel transmission function and the next adjacent channel transmission function. The step of removing the vibration interference signal from the pulse wave signal according to the pre-set adjacent channel transmission function and the next adjacent channel transmission function includes: The at least three pulse wave signals are input into the interference suppression algorithm model to remove the vibration interference signal.

11. The pulse wave acquisition method according to claim 10, characterized in that, The step of inputting the at least three pulse wave signals into the interference suppression algorithm model to remove the vibration interference signal includes: The at least three pulse wave signals are converted from the time domain to the frequency domain to obtain frequency domain signals; The frequency domain filtering coefficients are determined based on the adjacent channel transmission function and the next adjacent channel transmission function. The frequency domain signal is filtered using the frequency domain filtering coefficients to remove vibration interference components. The filtered signal is converted from the frequency domain to the time domain to obtain the at least three target pulse wave signals.

12. A pulse wave acquisition device, characterized in that, include: The main body of the wristband is for wearing on the left or right wrist of the human body; The first sensor group is disposed on the wristband body and includes a plurality of first pulse wave sensors arranged sequentially along the width direction of the wristband body, wherein the width direction of the wristband body corresponds to the blood flow direction of human blood vessels. A second sensor group is disposed on the wristband body. The second sensor group and the first sensor are distributed at intervals along the circumference of the wristband body. The second sensor group includes a plurality of second pulse wave sensors arranged sequentially along the width direction of the wristband body. The plurality of second pulse wave sensors correspond one-to-one with the plurality of first pulse wave sensors. When the wristband is worn on the left or right wrist, one of the first sensor group and the second sensor group can collect the pulse of the corresponding wrist. A processor, connected to the first sensor group and the second sensor group, is configured to perform the pulse wave acquisition method according to any one of claims 9 to 11, wherein the pulse wave sensor group is the first sensor group or the second sensor group.

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