A dynamic evaluation system for multi-degree-of-freedom fabric electrodes

Abstract

The present invention discloses a multi-degree-of-freedom dynamic evaluation system for textile electrodes, relating to the field of textile electrode testing. The system comprises: multiple textile electrodes to be tested, a fixed layer, a bionic skin device, a drive module, and a signal processing module. The outer surface of the bionic skin device simulates the skin surface, the fixed layer simulates clothing, and the bionic skin device is placed within the fixed layer with a certain movement gap between the two. Multiple textile electrodes to be tested are mounted on the fixed layer, and each textile electrode to be tested is connected to the signal processing module. The drive module is used to bring the outer surface of the bionic skin device into multi-directional contact with the fixed layer, thereby obtaining dynamic performance data of the textile electrodes to be tested under different test conditions. The signal processing module is used to analyze and process the collected dynamic performance data, thereby evaluating the dynamic performance of the textile electrodes to be tested. The system uses two drive modes to effectively simulate the movement of the textile electrodes on real skin, which facilitates the evaluation of the dynamic performance of the electrodes.

Description

Technical Field

[0001] The invention relates to the field of textile electrode detection, in particular to a multi-degree-of-freedom textile electrode dynamic evaluation system. Background Art

[0002] With the advancement of electronic information technology, research on wearable health monitoring devices and their evaluation methods is also advancing. Wearable motion monitoring devices collect physiological signals from the human body surface and analyze the athlete's physical condition in real time, providing a scientific and effective method for real-time physiological monitoring of the human body during exercise. The intelligent, sensitive, and convenient features of wearable monitoring devices are also driving the apparel industry towards the development of smart wearable devices. Fabric electrodes, as the signal acquisition terminal, play a particularly important role.

[0003] Fabric electrodes are a common electrode material that can not only collect physiological signals well, but also better meet the comfort requirements of clothing. However, a search revealed that the number of existing bioelectrode testing systems is small and the technology is immature. For example, CN114624538A proposed an ECG electrode electrical performance tester, which solved the problem of limited detection functions and low work efficiency of manual ECG electrode detection; but it did not consider the large difference between the simulated test results and the test results of real human skin. CN207181539U provides a textile electrode dynamic noise evaluation instrument, which effectively simulates the movement of electrodes on real skin, replaces human skin with solid electrolyte film, and has controllable humidity and temperature, thereby improving the repeatability and reproducibility of textile electrode dynamic noise testing. However, it can only measure one electrode at a time, which cannot meet the testing needs of multiple electrodes and does not conform to the current development direction of multi-lead ECG clothing. Summary of the Invention

[0004] In response to the above problems and technical requirements, the inventors have proposed a multi-degree-of-freedom fabric electrode dynamic evaluation system. The technical solution of the present invention is as follows:

[0005] A multi-degree-of-freedom fabric electrode dynamic evaluation system comprises a plurality of fabric electrodes to be tested and a fixed layer, a bionic skin device, a driving module and a signal processing module, wherein the bionic skin device is a passive device; wherein the outer surface of the bionic skin device is used to simulate the skin surface, the fixed layer is used to simulate clothing, and the bionic skin device is placed within the fixed layer with a certain movement gap between the two; the plurality of fabric electrodes to be tested are mounted on the fixed layer, and each fabric electrode to be tested is connected to the signal processing module; the driving module is used to make the outer surface of the bionic skin device and the fixed layer produce multi-directional and multi-angle contact at multiple positions, thereby obtaining dynamic performance data of the fabric electrodes to be tested under different test conditions; the signal processing module is used to analyze and process the collected dynamic performance data, and then evaluate the dynamic performance of the fabric electrodes to be tested; the dynamic performance data is electrochemical impedance performance data fed back from the skin surface.

[0006] Its further technical solution is that the system also includes an ECG signal simulation module, and the conductive electrodes of the ECG signal simulation module are inserted into the bionic skin device to simulate the skin state when there are human physiological electrical signals. At this time, the bionic skin device is an active device, and the dynamic performance data is the ECG signal fed back from the skin surface.

[0007] Its further technical solution is that the bionic skin device includes a saline tank, a partition, a contact window and a bionic skin conductive film; the bionic skin conductive film is applied to the outer surface of the saline tank, serving as the outer surface of the bionic skin device; the interior of the saline tank is divided into multiple independent spaces by partitions, and a contact window is provided on the tank surface of each independent space, and each fabric electrode to be tested is placed corresponding to a contact window, and the contact window is used to achieve contact between the bionic skin conductive film and the saline.

[0008] Its further technical solution is that the driving module is a moving robotic arm, which grabs the bionic skin device and controls the moving robotic arm to move according to the set trace and speed, so that the bionic skin device moves in the fixed layer, thereby achieving multi-directional and multi-angle contact between the outer surface of the bionic skin device and the fixed layer at multiple positions; wherein, the test conditions are changed by changing the moving trace and speed of the moving robotic arm.

[0009] Its further technical solution is that the driving module is composed of multiple pressure applying modules, and the multiple pressure applying modules are distributed in the fixed layer. By controlling the pressure applying modules separately to apply pressures of different directions and magnitudes to different areas of the fixed layer, the fixed layer can achieve multi-directional and multi-angle contact with the outer surface of the bionic skin device under the action of pressure; wherein, the test conditions are changed by changing the direction and magnitude of the pressure applied by the pressure applying module.

[0010] Its further technical solution is that the system also includes multiple pressure sensors and multiple humidity sensors. The pressure sensors are evenly distributed on the fixed layer and are used to measure the pressure data between the outer surface of the bionic skin device and the fixed layer, and transmit the data to the signal processing module; the humidity sensors are distributed around the fixed layer and are connected to the voltage detector to monitor the seepage of physiological saline in the bionic skin device.

[0011] Its further technical solution is to place the independent conductive electrodes of the ECG signal simulation module into different independent spaces of the physiological saline tank respectively, and connect the fabric electrodes to be tested corresponding to the independent spaces to a multi-channel physiological recorder, which is used to record the changes of the standard ECG signal passing through the fabric electrodes to be tested.

[0012] A further technical solution is that the curvature of the outer surface of the physiological saline tank is not unique, so as to simulate the curvature of the skin surface of different parts of the human body.

[0013] Its further technical solution is that physiological saline is NaCl liquid electrolyte, and the physiological saline tank is equipped with two water inlet pumps to respectively control the ratio of pure water and NaCl solution to simulate the changes in human body fluid concentration during exercise.

[0014] A further technical solution is that an injection port and an output port are provided on the physiological saline tank, which are respectively connected to a temperature-controlled circulation device to realize the circulation flow of the physiological saline to simulate the flow of human body fluids.

[0015] The beneficial technical effects of the present invention are:

[0016] The dynamic evaluation system for fabric electrodes constructed in the present application is relatively simple and convenient. It uses two driving modes to achieve multi-degree-of-freedom contact between the bionic skin conductive film of the bionic skin device and the fabric electrodes to be tested on the corresponding fixed layer at multiple locations. This can effectively simulate the movement of the fabric electrodes on real skin, and the collected dynamic performance data is more accurate and comprehensive, which is conducive to the evaluation of the dynamic performance of the fabric electrodes to be tested. One of the driving modes acts on the fixed layer, and by controlling the magnitude and direction of the pressure applied to the fixed layer, it simulates the different pressures of the fabric electrodes in different areas when the human body wears clothes. The other driving mode acts on the bionic skin device, and by controlling the movement direction and speed of the bionic skin device, it simulates the relative movement of the fabric electrodes on the simulated skin at different speeds and directions, thereby generating multi-directional and multi-angle contact pressure. The interior of the physiological saline tank is divided into multiple independent spaces, each of which can be used to independently test the fabric electrodes to be tested. Fabric electrodes in different independent spaces can also be connected to form a multi-lead fabric electrode to achieve simultaneous testing of multiple-lead fabric electrodes, thereby improving testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Schematic diagram of the bionic skin device and the fixing layer provided in this application.

[0018] Figure 2 This is a schematic diagram of the motion robotic arm provided in this application acting on the bionic skin device.

[0019] Figure 3 This is a schematic diagram of the pressure sensor provided by the present application being arranged on a fixed layer.

[0020] Figure 4 This is a circuit connection diagram of the active bionic skin device provided in this application. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0022] The present application provides a multi-degree-of-freedom fabric electrode dynamic evaluation system, comprising a plurality of fabric electrodes to be tested and a fixing layer 1, a bionic skin device 2, a driving module, a signal processing module and an electrocardiogram signal simulation module. Figure 1 As shown, the outer surface of the bionic skin device is used to simulate the skin surface, the fixed layer 1 is used to simulate clothing, and the bionic skin device 2 is placed in the fixed layer 1 with a certain movement gap between the two. Multiple fabric electrodes to be tested are installed on the fixed layer 1 (not shown in the figure), and each fabric electrode to be tested is connected to a signal processing module. The driving module is used to make the outer surface of the bionic skin device and the fixed layer 1 produce multi-directional and multi-angle contact at multiple positions, so as to obtain dynamic performance data of the fabric electrodes to be tested under different test conditions. When the ECG signal simulation module is not connected to the system, the bionic skin device 2 is a passive device, and the dynamic performance data at this time is the electrochemical impedance performance data fed back from the skin surface. When the conductive electrode of the ECG signal simulation module is inserted into the bionic skin device 2 to simulate the skin state in the presence of human physiological electrical signals (such as ECG signals composited with myoelectricity, etc.), the bionic skin device 2 is now an active device, and the dynamic performance data is the ECG signal fed back from the skin surface.

[0023] like Figure 1 As shown, the bionic skin device 2 includes a physiological saline tank 21, a partition 22, a contact window 23 and a bionic skin conductive film. The bionic skin conductive film is applied to the outer surface of the physiological saline tank (not shown) by a clamping device, as the outer surface of the bionic skin device. The inside of the physiological saline tank 21 is divided into multiple independent spaces by the partition 22, and the tank surface of each independent space is provided with a contact window 23. Each fabric electrode to be tested is placed corresponding to a contact window 23, and the contact window 23 is used to realize the contact between the bionic skin conductive film and the physiological saline. Optionally, the clamping device can be placed at the upper and lower ends of the physiological saline tank 21 respectively, and the specific form can be a rubber ring or other device that can be used for fastening, and this application does not limit this.

[0024] In this embodiment, the physiological saline tank 21 is a barrel-shaped structure, and six partitions 22 are used to divide the physiological saline tank 21 into ten independent spaces. Therefore, the bionic skin device provided in this embodiment can simultaneously place ten fabric electrodes to be tested and conduct tests at the same time. One of the partitions is placed horizontally to divide the tank into two layers, upper and lower, and the remaining five partitions are placed with the vertical center axis of the tank as the placement boundary, dividing each layer into five independent spaces. Each independent space is filled with NaCl liquid electrolyte, and the tank surfaces of several independent spaces are selected to open injection ports and output ports, which are respectively connected to temperature-controlled circulation devices to realize the circulation of physiological saline (i.e., NaCl liquid electrolyte) to simulate the flow of human body fluids. The physiological saline tank 21 is equipped with two water inlet pumps to respectively control the ratio of pure water and NaCl solution, and then regulate different concentrations of human electrolyte solutions (mainly controlled to fluctuate around 0.9%) to simulate the changes in human body fluid concentration as water is lost during exercise.

[0025] Optionally, the physiological saline tank 21 can be a barrel structure, in which case the curvature of the outer surface is unique; the tank surface can also be made into an elliptical splicing structure, in which case the curvature of the outer surface of the tank is not unique and will change with the change of the central angle of the circle to simulate the curvature of the skin surface of different parts of the human body.

[0026] This embodiment provides two driving modes. One driving mode is: Figure 2 As shown, when the driving module is a motion manipulator 3, the motion manipulator 3 grasps the bionic skin device 2. For example, the gripper of the motion manipulator 3 can grasp the upper end of the water tank, the center where the vertical partitions 22 converge. By controlling the motion manipulator 3 to move according to the set line and speed, the bionic skin device 2 (i.e., the physiological saline tank 21 with the bionic skin conductive membrane) grasped by it moves in the fixed layer 1, achieving multi-directional and multi-angle contact between the outer surface of the bionic skin device and the fixed layer 1 at multiple locations, that is, causing the fabric electrode to be tested and the bionic skin conductive membrane to move relative to each other, thereby achieving contact. Optionally, the motion manipulator 3 used in this embodiment is a four-axis motion manipulator, which can achieve multi-degree-of-freedom movement, that is, grasping and carrying the bionic skin device 2 to perform circular or reciprocating movements at multiple angles and directions, so as to achieve extrusion, friction, and twisting movements with the fixed layer 1 at multiple locations and multiple angles.

[0027] Another driving method involves multiple pressure-applying modules distributed across fixed layer 1. A multi-motor control device controls each pressure-applying module to apply pressure in different directions and magnitudes to different regions of fixed layer 1. This allows the fixed layer 1 to achieve multi-directional and multi-angle contact with the outer surface of the bionic skin device under pressure, effectively bringing the fabric electrodes under test into contact with the bionic skin's conductive membrane. If the fixed layer rotates at different angles or reciprocates up and down, friction between the fabric electrodes under the pressure-applying modules and the bionic skin can be achieved, allowing evaluation of the fabric electrodes' dynamic performance.

[0028] During the test, the test conditions are altered by changing the trajectory and speed of the robotic arm, or by varying the direction and magnitude of pressure applied by the pressure-applying module. This results in varying contact pressures between the fabric electrode under test and the bionic skin conductive membrane. Dynamic performance data is then collected from the fabric electrode under test during this process. The signal processing module analyzes and processes this collected dynamic performance data, generating corresponding variation curves for each test condition to evaluate the dynamic performance of the fabric electrode under test. These variation curves can optionally be stored as electronic files.

[0029] like Figure 3 As shown, this embodiment also includes multiple pressure sensors 4 evenly distributed on the fixing layer 1. These pressure sensors 4 measure the pressure between the outer surface of the bionic skin device and the fixing layer 1 and transmit the pressure data to the signal processing module. Furthermore, multiple humidity sensors are placed on the fixing layer 1. A voltage detector detects voltage changes across the humidity sensors. When a set voltage threshold is reached, the voltage detector generates an alarm signal, indicating excessive saline leakage from the bionic skin device 2 and prompting the tester to check the sealing of the bionic skin device 2.

[0030] like Figure 4As shown, when performing active testing on a fabric electrode under test, this embodiment uses a set (two) of fabric electrodes under test as an example. The two independent conductive electrodes 6 of the ECG signal simulation module 5 are placed in separate compartments of a physiological saline tank 21. The fabric electrodes corresponding to the independent compartments are connected to a multi-channel physiological recorder 7, effectively connecting the ECG signal simulation module 5 and the multi-channel physiological recorder 7 in parallel. The ECG signal simulation module 5 simulates the ECG signal and myoelectric noise for testing, which are then output to the physiological saline tank 21 via the conductive electrodes 6. The multi-channel physiological recorder 7 records the changes in the standard ECG signal as it passes through the fabric electrodes under test. This data can also be transmitted to the signal processing module for storage and analysis of dynamic performance data. When testing ten fabric electrodes under test simultaneously, the ten conductive electrodes 6 of the ECG signal simulation module 5 are placed in separate compartments of the physiological saline tank 21. After the conductive electrodes 6 are inserted, the tank surface is sealed. The signal processing module receives the ECG signals transmitted back from each fabric electrode under test and processes them using existing algorithms to produce a 12-lead ECG.

[0031] The above description is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the scope of protection of the present invention.

Claims

1. A multi-degree-of-freedom fabric electrode dynamic evaluation system, characterized in that: The bionic skin device comprises a plurality of fabric electrodes to be tested and a fixed layer, a bionic skin device, a driving module and a signal processing module, wherein the bionic skin device is a passive device; wherein the outer surface of the bionic skin device is used to simulate the skin surface, the fixed layer is used to simulate clothing, the bionic skin device is placed in the fixed layer and a certain movement gap is left between the two; a plurality of the fabric electrodes to be tested are mounted on the fixed layer, and each of the fabric electrodes to be tested is connected to the signal processing module; the driving module is used to make the outer surface of the bionic skin device and the fixed layer produce multi-directional and multi-angle contact at multiple positions, so as to obtain dynamic performance data of the fabric electrode to be tested under different test conditions; the signal processing module is used to analyze and process the collected dynamic performance data, and then evaluate the dynamic performance of the fabric electrode to be tested; the dynamic performance data is the electrochemical impedance performance data fed back from the skin surface.

2. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 1, characterized in that: It also includes an ECG signal simulation module, the conductive electrodes of which are inserted into the bionic skin device to simulate the skin state in the presence of human physiological electrical signals. At this time, the bionic skin device is an active device, and the dynamic performance data is the ECG signal fed back from the skin surface.

3. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 2, characterized in that: The bionic skin device includes a physiological saline tank, a partition, a contact window and a bionic skin conductive film; the bionic skin conductive film is applied to the outer surface of the physiological saline tank, serving as the outer surface of the bionic skin device; the interior of the physiological saline tank is divided into multiple independent spaces by the partition, and the tank surface of each independent space is provided with a contact window. Each of the fabric electrodes to be tested is placed corresponding to a contact window, and the contact window is used to achieve contact between the bionic skin conductive film and the physiological saline.

4. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 1 or 2, characterized in that: The driving module is a motion robotic arm that grabs the bionic skin device and controls the motion robotic arm to move according to a set trajectory and speed, thereby causing the bionic skin device to move in the fixed layer, thereby achieving multi-directional and multi-angle contact between the outer surface of the bionic skin device and the fixed layer at multiple locations; wherein, the test conditions are changed by changing the moving trajectory and speed of the motion robotic arm.

5. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 1 or 2, characterized in that: The driving module comprises a plurality of pressure-applying modules, which are distributed on the fixed layer. By controlling the pressure-applying modules separately to apply pressures of different directions and magnitudes to different regions of the fixed layer, the fixed layer is brought into contact with the outer surface of the bionic skin device in multiple directions and at multiple angles under the action of pressure. The test conditions are changed by changing the direction and magnitude of the pressure applied by the pressure-applying modules.

6. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 1 or 2, characterized in that: The device further comprises a plurality of pressure sensors and a plurality of humidity sensors. The pressure sensors are evenly distributed on the fixing layer and are used to measure the pressure data between the outer surface of the bionic skin device and the fixing layer, and transmit the pressure data to the signal processing module. The humidity sensors are distributed around the fixing layer and are connected to the voltage detector to monitor the leakage of physiological saline in the bionic skin device.

7. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 3, characterized in that: The independent conductive electrodes of the ECG signal simulation module are placed in different independent spaces of the physiological saline tank respectively, and the fabric electrodes to be tested corresponding to the independent spaces are connected to a multi-channel physiological recorder, which is used to record the changes of the standard ECG signal passing through the fabric electrodes to be tested.

8. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 3, characterized in that: The curvature of the outer surface of the physiological saline tank is not unique, so as to simulate the curvature of the skin surface of different parts of the human body.

9. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 3, characterized in that: The physiological saline is a NaCl liquid electrolyte. The physiological saline tank is equipped with two water inlet pumps for controlling the ratio of pure water and NaCl solution respectively to simulate the changes in body fluid concentration of the human body under exercise.

10. The multi-degree-of-freedom fabric electrode dynamic evaluation system according to claim 3, characterized in that: The physiological saline tank is provided with an injection port and an output port, which are respectively connected to a temperature-controllable circulation device to realize the circulation flow of the physiological saline to simulate the flow of human body fluids.

Images