Hydrogel sheet-shaped or rubber sheet-shaped electrode impedance testing device

Abstract

The utility model provides a device for testing the impedance of a hydrogel sheet-shaped or rubber sheet-shaped electrode. The device comprises an electrode impedance test tool and an electrode counterweight pressing block. The test tool comprises a carrier block, a first connecting wire and a second connecting wire, a crown spring female pin anode is connected with a signal generator end cathode, a signal generator end anode is connected with the second connecting wire, and an oscilloscope end anode is connected with the second connecting wire; the cathode of the crown spring female pin is connected with the first connecting wire. The cathode of the oscilloscope end is connected with the first connecting wire. The first connecting wire is connected with an electrode wire of the first electrode plate; the second wiring is connected with an electrode wire of the second electrode plate. The counterweight pressing block is composed of an upper die and a lower die, positioning grooves matched with the electrode slices in shape are formed in the dies, and accurate butt joint of the electrode slices is guaranteed. According to the utility model, through optimizing the structure and professional interface design, simple and accurate test of electrode impedance is realized, and single-person automatic operation is supported.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrode impedance testing, and particularly relates to a testing device for the impedance of hydrogel sheet electrodes or rubber sheet electrodes. Background Technique

[0002] According to the relevant requirements for electrodes for nerve and muscle stimulators in the medical industry standard of the People's Republic of China (YY / T 0868-2021), the following test methods are specified for rubber sheet electrodes and hydrogel sheet electrodes: The test should be carried out in an environment of 23°C ± 5°C and a relative humidity of 40% ± 10%. Take a pair of rubber or hydrogel sheet electrodes and closely fit their conductive areas completely corresponding (if necessary, apply a force of about 100 g / cm² on the sheet electrodes to ensure the tight fit of the conductive parts). Sinusoidal signals of 400 Hz (current < 50 mA) and 1500 Hz (current < 80 mA) are applied to the input ends of the electrodes respectively (alternatively, according to the manufacturer's regulations, a suitable signal source can be selected within its applicable frequency range, but the current limit should meet the requirements of the output limits related to frequency in Table 201.101 of YY 9706.10-2021). The ratio of the effective value of the voltage at both ends of the electrode pair to the current is the conductive impedance of the electrode. The test should measure the conductive impedance of at least 12 pairs of electrodes and take the average value.

[0003] As can be seen from the above, electrode impedance testing must be carried out in the production and inspection links of electro-stimulating medical devices. However, previously, the resistance range of a multimeter was used to test the impedance of electrodes. Usually, the test leads of the multimeter were directly placed on the surface of the electrodes, and the contact surface was limited to the contact points of the test leads. The test signal during the resistance range test of the multimeter is a DC signal without an AC signal. Therefore, the error of the impedance value measured by the multimeter for the electrodes is relatively large. Due to the lack of necessary test instrument connection tools, multiple people are required to participate in the test process to specify the connection parts of the instrument, and the test process is time-consuming and laborious. Content of the Utility Model

[0004] To solve the above problems, the utility model provides an impedance testing device applicable to hydrogel sheet electrodes or rubber sheet electrodes. The device provides a professional interface for the testing instrument, making the testing process simple and allowing a single person to complete the test.

[0005] The solution of the present utility model to solve its technical problems is as follows: A test device for the impedance of a hydrogel sheet or rubber sheet electrode is adopted, which includes an electrode impedance test tooling and an electrode weight pressing block. The electrode impedance test tooling includes a carrier block, a first wiring and a second wiring. A pair of crown spring female pins for connecting the positive and negative poles of a multimeter, a pair of signal generator terminals for connecting the positive and negative poles of a signal generator, and a pair of oscilloscope terminals for connecting the positive and negative poles of an oscilloscope are fixed on the carrier block. Among them, the positive pole of the crown spring female pin is connected to the negative pole of the signal generator terminal, the positive pole of the signal generator is connected to the second wiring, and the positive pole of the oscilloscope terminal is connected to the second wiring; the negative pole of the crown spring female pin is connected to the first wiring, and the negative pole of the oscilloscope terminal is connected to the first wiring; the first wiring is connected to the electrode wire of the first electrode sheet; the second wiring is connected to the electrode wire of the second electrode sheet; the electrode weight pressing block includes an electrode sheet lower mold and an electrode sheet upper mold. Positioning grooves matching the shapes of the corresponding electrode sheets are respectively arranged on the inner side surfaces of the electrode sheet lower mold and the electrode sheet upper mold. The first electrode sheet is assembled in the positioning groove of the electrode sheet lower mold, and the second electrode sheet is assembled in the positioning groove of the electrode sheet upper mold. After the electrode sheet lower mold and the electrode sheet upper mold are fitted together, it is ensured that the rubber sheet electrodes of the first electrode sheet and the second electrode sheet can be fully butted in a matching manner.

[0006] Preferably, the electrode impedance test tooling further includes a box body and a top cover. The top cover is hermetically fixed on the upper side of the box body, and the carrier block is fixed inside the box body; four pairs of through holes are arranged on the side wall of the box body. The pair of crown spring female pins, the pair of signal generator terminals, the pair of oscilloscope terminals, the first wiring and the second wiring are respectively led out from the corresponding through holes.

[0007] Preferably, angle fixing holes are respectively arranged on the inner sides of the four top corners of the box body. When the box body and the top cover are fixed, the four top corners of the top cover are respectively fixedly connected to the angle fixing holes through bolts, so that the box body and the top cover are fixed as a whole.

[0008] Preferably, kit fixing holes are respectively arranged at both ends of the carrier block, and the carrier block is fixedly connected to the bottom of the box body through screws in the kit fixing holes of the carrier block.

[0009] Preferably, a pair of female pin fixing grooves for fixing the crown spring female pins, a pair of terminal fixing grooves for fixing the signal generator terminals, and a pair of terminal fixing grooves for fixing the oscilloscope terminals are arranged in the middle of the carrier block.

[0010] Preferably, end fixing holes are respectively arranged at the left and right ends of the box body, and an end wire seat is fixed in each end fixing hole; the first wiring is led out from the outer lead-out end of the end wire seat and connected to the first outer lead, and the first outer lead is connected to the electrode wire of the first electrode sheet; after the second wiring is led out from the outer lead-out end of the end wire seat and connected to the second outer lead, the second outer lead is connected to the electrode wire of the second electrode sheet.

[0011] Preferably, there is a fixed electrical connection or a plug-in connection between a pair of crown spring female pins and the positive and negative electrodes of the multimeter; there is a fixed electrical connection or a plug-in connection between a pair of signal generator ends and the positive and negative electrodes of the signal generator; there is a fixed electrical connection or a plug-in connection between a pair of oscilloscope ends and the positive and negative electrodes of the oscilloscope.

[0012] Advantages of the present utility model: Through structural optimization and professional interface design, the impedance test of the hydrogel sheet or rubber sheet electrode is made more convenient and accurate. The electrode impedance test tooling provides a variety of signal and current measurement interfaces, realizes automated testing, and can be completed by a single person. At the same time, the counterweight ensures that the electrode sheet fits tightly, improves the stability and repeatability of the test, meets the requirements of YY / T0868-2021 for tight fitting, and is applicable to the test environments of various electrode materials and shapes, thus improving the test efficiency and the reliability of the results. Description of the Drawings

[0013] Figure 1 is the external structure schematic diagram of the test device of the present utility model;

[0014] Figure 2 is Figure 1 the structural schematic diagram of the middle box body;

[0015] Figure 3 is Figure 2 the top view of

[0016] Figure 4 the connection circuit diagram of the wiring in the box body;

[0017] Figure 5 is the structural schematic diagram of the carrier block;

[0018] Figure 6 is Figure 1 the front view of

[0019] Figure 7 the assembly schematic diagram of the electrode counterweight.

[0020] Reference numerals in the figures: box body 1; top cover 2; corner fixing holes 3; carrier block 4; kit fixing holes 5; female pin fixing grooves 6; crown spring female pins 7; end fixing grooves 8; signal generator ends 91; oscilloscope ends 92; end fixing holes 10; end wire seats 11; first wiring 121; second wiring 122; first external lead 131; second external lead 132; first electrode sheet 141; second electrode sheet 142; electrode sheet lower mold 15; electrode sheet upper mold 16; rubber sheet electrode 17. Detailed Embodiments

[0021] The present utility model will be further described below with reference to the drawings and embodiments.

[0022] Example 1: A test device for the impedance of hydrogel sheet or rubber sheet electrodes, including an electrode impedance test tooling and an electrode weight pressing block. Among them, the electrode impedance test tooling mainly includes a carrier block, a first wiring 121, a second wiring 122, etc. This test device aims to provide a simple and easy-to-use test device for the impedance of hydrogel sheet or rubber sheet electrodes, which can achieve efficient and accurate impedance testing through professional interfaces and weight pressing blocks, meeting the requirements of relevant standards.

[0023] As Figure 4 shown, in this device, a pair of crown spring female pins 7 are fixed on the carrier block 4 for connecting (fixed connection or quick plugging) the positive and negative poles of a multimeter, a pair of signal generator terminals 91 for connecting (fixed connection or quick plugging) the positive and negative poles of a signal generator, and a pair of oscilloscope terminals 92 for connecting (fixed connection or quick plugging) the positive and negative poles of an oscilloscope. Among them, the positive pole of the crown spring female pin 7 is connected to the negative pole of the signal generator terminal 91, the positive pole of the signal generator terminal 91 is connected to the second wiring 122, and the positive pole of the oscilloscope terminal 92 is connected to the second wiring 122; the negative pole of the crown spring female pin 7 is connected to the first wiring 121, and the negative pole of the oscilloscope terminal 92 is connected to the first wiring 121; the first wiring 121 is connected to the electrode wire of the first electrode sheet 141; the second wiring 122 is connected to the electrode wire of the second electrode sheet 142.

[0024] As Figure 7 shown, the electrode weight pressing block includes an electrode sheet lower mold 15 and an electrode sheet upper mold 16. Positioning grooves matching the shapes of the corresponding electrode sheets are respectively arranged on the inner side surfaces of the electrode sheet lower mold 15 and the electrode sheet upper mold 16. The first electrode sheet 141 is assembled in the positioning groove of the electrode sheet lower mold 15, and the second electrode sheet 142 is assembled in the positioning groove of the electrode sheet upper mold 16. After the electrode sheet lower mold 15 and the electrode sheet upper mold 16 are fitted together, it is ensured that the rubber sheet electrodes 17 of the first electrode sheet 141 and the second electrode sheet 142 can be fully and effectively docked.

[0025] Based on the above electrode impedance test device, the positive and negative terminals of the multimeter are used to connect the positive and negative test leads of the multimeter input, the positive and negative terminals of the signal generator are used to connect the positive and negative outputs of the signal generator, and the positive and negative terminals of the oscilloscope are used to connect the positive and negative inputs of the oscilloscope. The internal circuit schematic diagram of the electrode impedance test tooling is as Figure 4 shown. The electrode weight pressing block is a weight mold made according to the shape of the electrode sheet, and the material is selected as a high-density material to ensure that the electrode pair can be completely and effectively fitted after fitting, and the fitting state during testing. If the weight block cannot meet the requirement of tight fitting in YY / T0868-2021, a pressure block can also be applied directly above.

[0026] Electrode impedance test method: An external signal generator is used to generate a sinusoidal alternating current signal that meets the impedance test requirements and apply it to the electrode pair. A multimeter is connected in series to the electrode pair to be measured to measure the effective value I of the current flowing through the electrode pair. An oscilloscope is used to measure the effective value U of the alternating voltage across the electrode pair. According to the impedance calculation formula R = U / I, the impedance value is calculated. The conductive impedance of multiple groups of electrodes is repeatedly tested, and the average value is taken to obtain the conductive impedance of the electrotherapy instrument.

[0027] Embodiment 2: Another test device for the impedance of hydrogel sheet or rubber sheet electrodes, including an electrode impedance test tooling and an electrode weight pressing block. Among them, the electrode impedance test tooling includes a box body 1, a top cover 2, a carrier block 4, a crown spring female pin 7, a signal generator end 91, a wiring, an external lead, and an electrode sheet, etc.

[0028] As Figure 1 and Figure 2 shown, the box body 1 is a rectangular structure. Angle fixing holes 3 are respectively arranged on the inner sides of the four top corners of the box body 1. When the box body 1 is fixed to the top cover 2, the four top corners of the top cover 2 are respectively fixed to the angle fixing holes 3 through bolts, so that the box body 1 and the top cover 2 are fixed as a whole.

[0029] A carrier block 4 is fixed to the inner bottom of the box body 1. As Figures 3 - 5 shown, kit fixing holes 5 are respectively arranged at both ends of the carrier block 4, and the kit fixing holes 5 of the carrier block 4 are fixed to the bottom of the box body 1 through screws.

[0030] A pair of female pin fixing grooves 6 are successively arranged in the middle of the carrier block 4, which are respectively used to fix the crown spring female pins 7; a pair of end fixing grooves 8, which are respectively used to fix the signal generator end 91; a pair of end fixing grooves 8, which are respectively used to fix the oscilloscope end 92. As Figure 1 and Figure 6 shown, a pair of fixed crown spring female pins 7 are divided into positive and negative poles, and are respectively connected to the positive and negative poles of the multimeter. A pair of signal generator ends 91 are divided into positive and negative poles, and are respectively connected to the positive and negative poles of the signal generator. A pair of oscilloscope ends 92 are divided into positive and negative poles, and are respectively connected to the positive and negative poles of the oscilloscope.

[0031] The wiring is located inside the box body 1 and includes a first wiring 121 and a second wiring 122. The positive pole of the crown spring female pin 7 is connected to the negative pole of the signal generator end 91. The positive pole of the signal generator end 91 is connected to the second wiring 122. The positive pole of the oscilloscope end 92 is connected to the second wiring 122. The negative pole of the crown spring female pin 7 is connected to the first wiring 121. The negative pole of the oscilloscope end 92 is connected to the first wiring 121.

[0032] End fixing holes 10 are respectively arranged at the left and right ends of the box body 1, and an end wire seat 11 is fixed in each end fixing hole 10. The external lead includes a first external lead 131 and a second external lead 132. The first wiring 121 is led out from the external lead-out end of the end wire seat 11 to connect the first external lead 131, and the first external lead 131 is connected to the electrode wire of the first electrode plate 141; after the second wiring 122 is led out from the external lead-out end of the end wire seat 11 to connect the second external lead 132, the second external lead 132 is connected to the electrode wire of the second electrode plate 142.

[0033] It further includes an electrode weight pressing block, which includes a lower electrode plate mold 15 and an upper electrode plate mold 16. Positioning grooves matching the shape of the electrode plate are respectively arranged on the inner side surfaces of the lower electrode plate mold 15 and the upper electrode plate mold 16. The first electrode plate 141 is assembled in the positioning groove of the lower electrode plate mold 15, and the second electrode plate 142 is assembled in the positioning groove of the upper electrode plate mold 16. After the lower electrode plate mold 15 and the upper electrode plate mold 16 are fitted together, it is ensured that the rubber sheet electrodes 17 of the first electrode plate 141 and the second electrode plate 142 can be fully butted in a matching manner.

[0034] Based on the above solution, the specific usage steps of the electrode impedance testing device are as follows: First, prepare the electrode impedance testing tooling and the electrode weight pressing block, and check all connection wires and interfaces to ensure they are in good condition. Select a signal generator, a multimeter, and an oscilloscope that meet the impedance testing requirements. At the same time, place the first electrode sheet (such as a hydrogel sheet or a rubber sheet electrode) in the positioning groove of the lower electrode sheet mold, ensuring it fits perfectly into the positioning groove. Assemble the second electrode sheet in the positioning groove of the upper electrode sheet mold, also ensuring it fits perfectly into the positioning groove. Fit the lower electrode sheet mold and the upper electrode sheet mold together to ensure that the rubber sheet electrodes of the two electrodes are fully docked. If the tight fit does not meet the requirements of YY / T 0868-2021 standard, an additional pressure block can be applied directly above to enhance the fit effect of the electrode sheet. Then, connect the ends of the external leads to the signal generator, the multimeter, and the oscilloscope in sequence: Connect the positive and negative terminals of the signal generator to the corresponding terminals of the electrode external lead; connect the positive and negative terminals of the multimeter to the lead-out terminals of the crown spring female pin for measuring the current flowing through the electrode; connect the positive and negative terminals of the oscilloscope to the corresponding terminals for measuring the voltage across the electrode. Set the signal source: Set a sinusoidal alternating current signal that meets the impedance testing requirements on the signal generator and apply this signal to the electrode pair to be tested. Conduct the measurement: The multimeter measures the effective value of the current (I) flowing through the electrode pair, and the oscilloscope measures the effective value of the alternating voltage (U) across the electrode pair. Use the impedance calculation formula (R = U / I) to calculate the impedance value of the electrode pair. Repeat this step to test the conductive impedance of multiple groups of electrodes and take the average value as the final measurement result. Record the impedance data of each test, analyze the stability and consistency of its conductive performance, and adjust the test method or test environment as needed to ensure the reliability and accuracy of the test results. The above steps ensure the simplicity of the test process and the accuracy of the measurement results, and can effectively evaluate the conductive impedance performance of hydrogel sheet or rubber sheet electrodes.

[0035] The above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for testing impedance of hydrogel sheet or rubber sheet electrode, characterized in that: The invention comprises an electrode impedance testing tool and an electrode counterweight pressing block, wherein the electrode impedance testing tool comprises a carrier block, a first wiring (121) and a second wiring (122), wherein a pair of crown spring female pins (7) are fixed on the carrier block (4) for connecting the positive and negative poles of a multimeter, a pair of signal generator terminals (91) are used to connect the positive and negative poles of the signal generator, and a pair of oscilloscope terminals (92) are used to connect the positive and negative poles of the oscilloscope; wherein the positive pole of the crown spring female pin (7) is connected to the negative pole of the signal generator terminal (91), the positive pole of the signal generator terminal (91) is connected to the second wiring (122), and the positive pole of the oscilloscope terminal (92) is connected to the second wiring (122); the negative pole of the crown spring female pin (7) is connected to the first wiring (121), and the negative pole of the oscilloscope terminal (92) is connected to the first wiring (121); the first wiring (121) is connected to the electrode wire of the first electrode sheet (141); the second wiring (122) is connected to the electrode wire of the second electrode sheet (142); the electrode counterweight pressing block comprises an electrode sheet lower mold (15) and an electrode sheet upper mold (16), and positioning grooves matching the shapes of the corresponding electrode sheets are respectively arranged on the inner side surfaces of the electrode sheet lower mold (15) and the electrode sheet upper mold (16); the first electrode sheet (141) is assembled in the positioning groove of the electrode sheet lower mold (15), and the second electrode sheet (142) is assembled in the positioning groove of the electrode sheet upper mold (16); after the electrode sheet lower mold (15) and the electrode sheet upper mold (16) are attached together, it is ensured that the rubber sheet electrodes (17) of the first electrode sheet (141) and the second electrode sheet (142) can be matched and fully docked.

2. The device for testing the impedance of the hydrogel sheet or rubber sheet electrode according to claim 1, characterized in that: The electrode impedance testing tool further comprises a box body (1) and a top cover (2), wherein the top cover (2) is sealed and fixed to the upper side of the box body (1), and the carrier block (4) is fixed inside the box body (1); four pairs of through holes are arranged on the side wall of the box body (1), and the pair of crown spring female pins (7), a pair of signal generator ends (91), a pair of oscilloscope ends (92), a first wiring (121), and a second wiring (122) are respectively led out from corresponding through holes.

3. The device for testing impedance of hydrogel sheet or rubber sheet electrode according to claim 2, characterized in that: Corner fixing holes (3) are respectively provided inside the four top corners of the box body (1); when the box body (1) and the top cover (2) are fixed, the four top corners of the top cover (2) are respectively fixedly connected to the corner fixing holes (3) by bolts, so that the box body (1) and the top cover (2) are fixed as a whole.

4. The device for testing impedance of hydrogel sheet or rubber sheet electrode according to claim 2, characterized in that: Both ends of the carrier block (4) are respectively provided with a kit fixing hole (5), and the kit fixing hole (5) of the carrier block (4) is fixed to the bottom of the box body (1) by means of screws.

5. The device for testing impedance of hydrogel sheet or rubber sheet electrode according to any one of claims 1 to 4, characterized in that: A pair of female pin fixing grooves (6) are provided in the middle of the carrier block (4) for fixing the crown spring female pin (7); a pair of end fixing grooves (8) are provided for fixing the signal generator end (91); and a pair of end fixing grooves (8) are provided for fixing the oscilloscope end (92).

6. The device for testing impedance of hydrogel sheet or rubber sheet electrode according to claim 1, characterized in that: End fixing holes (10) are respectively provided at the left and right ends of the box body (1), and an end wire holder (11) is fixed in each end fixing hole (10); the first wiring (121) is led outward from the end wire holder (11) to connect with a first external lead wire (131), and the first external lead wire (131) is connected with an electrode wire of a first electrode sheet (141); after the second wiring (122) is led outward from the end wire holder (11) to connect with a second external lead wire (132), the second external lead wire (132) is connected with an electrode wire of a second electrode sheet (142).

7. The device for testing impedance of hydrogel sheet or rubber sheet electrode according to claim 1, characterized in that: A pair of crown spring female pins (7) are in a fixed electrical connection relationship or a plug-in relationship with the positive and negative electrodes of the multimeter; a pair of signal generator ends (91) are in a fixed electrical connection relationship or a plug-in relationship with the positive and negative electrodes of the signal generator; and a pair of oscilloscope ends (92) are in a fixed electrical connection relationship or a plug-in relationship with the positive and negative electrodes of the oscilloscope.

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