Stimulation acquisition dry electrode for measuring muscle electrical impedance, preparation method and equipment

Abstract

The invention provides a stimulation acquisition dry electrode for muscle electrical impedance measurement, a preparation method and equipment. In the dry electrode, the inner layer magic tape is in direct contact with the skin so as to perform epidermal muscle electrical stimulation and epidermal electrophysiological signal acquisition; the outer-layer magic tape is adhered to the hair surface of the nylon cuff so as to fix the position of the electrode; and the enameled wire leads out electrophysiological signals. In the inner-layer Velcro, the positions, adjacent to the inner-layer Velcro base, of the bottom ends of a plurality of inner-layer Velcro single hooks are wrapped by insulation sealant, the surface of the top end of each inner-layer Velcro single hook is provided with a roughened structure, and the surface of each inner-layer Velcro single hook is provided with a silver paste conducting layer. And the outer-layer magic tape is adhered to the inner-layer magic tape through epoxy resin. The enameled wire penetrates through the first laser ablation hole in the inner-layer hook-and-loop fastener base to be led out of the inner-layer hook-and-loop fastener and then penetrates through the second laser ablation hole in the outer-layer hook-and-loop fastener base to be led out to the outside. The problems that an existing electrode is poor in wearing comfort, the electrode cannot be repeatedly used, and the current stimulation efficiency is low can be solved.

Description

Technical Field

[0001] The present invention belongs to the field of biomedical electronics, and particularly relates to a stimulation acquisition dry electrode for muscle impedance measurement, a preparation method of the dry electrode, and a stimulation acquisition device for muscle impedance measurement including the dry electrode. Background Art

[0002] Muscle impedance can provide detailed physiological data on muscle composition and structure. Currently, most bioimpedance methods rely on four-electrode impedance measurement. The method of measuring impedance is to apply alternating current through a pair of electrodes (high current and low current), and then measure the generated voltage through another pair of electrodes (high voltage and low voltage), and calculate the impedance through the voltage and current. By analyzing muscle impedance, the health status of muscles can be evaluated, which helps in diagnosis, tracking the progress of diseases, and evaluating the recovery of diseases. It has developed relatively rapidly in recent years.

[0003] Currently, gel physical therapy electrodes are generally used for muscle impedance measurement. This method has the following serious problems: (1) When the gel is in long-term contact with the skin, the gel will cause sweat and heat to be unable to be effectively discharged, easily causing a stuffy and humid feeling, resulting in poor comfort during long-term wearing of the gel; (2) After the gel electrode is taken out from the skin surface, the stickiness of the gel will drop significantly, and at the same time, a large amount of impurities will adhere to the gel surface, making it impossible to be used again. When measuring different positions, new electrode patches need to be attached, and the utilization rate of the electrode patches is low; (3) Most gel physical therapy electrode patches adopt a planar structure. When the electrode contacts the skin, the current will spread around after entering the gel, resulting in a decrease in current density and being unable to act concentratedly on the target area, and the current stimulation efficiency is low.

[0004] In view of the above problems, the applicant of the present application proposed a long-term electroencephalogram acquisition dry electrode based on conductive magic tape and its preparation method (patent publication number: CN 118717130 A). Among them, the electrode includes a conical spring and conductive magic tape; the conductive magic tape is attached to the surface of the conical spring in a fixed manner with uninterrupted electrical connection. The soft hook hair of the magic tape can ensure wearing comfort. However, through further research, it is found that the electrode conducts electricity through the silver paste conductive layer on the surface of the magic tape. The thickness of the conductive layer is small, which is likely to bring large errors when collecting electrical signals. Moreover, the length of the hook hair is long, and the hook hair is easily bent when in close contact with the skin, resulting in an increase in the contact area between the hook hair and the skin, which is not conducive to the precise stimulation of the current in the target area and cannot meet the requirements of high current stimulation efficiency. Summary of the Invention

[0005] The object of the present invention is to solve the following problems existing in the prior art: Using gel physical therapy electrodes for measuring muscle impedance will result in poor wearing comfort, non-reusable electrodes, low current stimulation efficiency, and the dry electrodes based on conductive magic tapes still cannot meet the requirements of high current stimulation efficiency. Therefore, a stimulation acquisition dry electrode for muscle impedance measurement with good wearing comfort, reusable, and high current stimulation efficiency is provided, as well as a preparation method of the dry electrode and a stimulation acquisition device for muscle impedance measurement including the dry electrode, which is of great significance for long-term and convenient measurement of muscle impedance at different positions and evaluation of muscle health status.

[0006] To achieve the above object, the technical solution provided by the present invention is:

[0007] On the one hand, a stimulation acquisition dry electrode for muscle impedance measurement is provided, which includes an inner magic tape, an outer magic tape, and an enameled wire; the inner magic tape is used to directly contact the skin for epidermal muscle electrical stimulation and epidermal electrophysiological signal acquisition; the outer magic tape is used to adhere to the furry side of the nylon cuff to fix the electrode position; the enameled wire is used to lead out the electrophysiological signal;

[0008] The inner magic tape includes an inner magic tape base and a plurality of inner magic tape single hooks. The bottom end of each inner magic tape single hook is wrapped by an insulating sealant adjacent to the inner magic tape base, and the top surface has a roughened structure. The surface of each inner magic tape single hook has a silver paste conductive layer, and the inner magic tape base has a first laser ablation hole;

[0009] The outer magic tape is bonded to the inner magic tape through epoxy resin, and includes an outer magic tape base and a plurality of outer magic tape single hooks. The outer magic tape base has a second laser ablation hole;

[0010] The enameled wire passes through the first laser ablation hole, leads out from the inner magic tape, and then passes through the second laser ablation hole and leads out to the outside.

[0011] Further, the roughened structure is a crack cut by laser or a structure after impregnating with nylon etching solution.

[0012] Further, the insulating sealant adopts one or more of the following polymer materials: polyurethane, polysiloxane, butyl rubber, chloroprene rubber, acrylate, and acrylate alcohol; the inner magic tape and the outer magic tape adopt one or more of the following elastic materials: nylon, fiber, and polyester; the insulating layer of the enameled wire adopts one or more of the following materials: acetal, polyester, polyurethane, and polyester imide; the conductive layer of the enameled wire adopts one or both of the following conductive materials: copper and silver.

[0013] Furthermore, the length of the inner hook-and-loop fastener single hook is 1 - 5 mm, the diameter is 0.5 - 1.5 mm, the diameter of the inner hook-and-loop fastener base is 5 - 15 mm, the thickness of the silver paste conductive layer is 300 - 500 μm, and the height of the insulating sealant is 1 - 4 mm.

[0014] On the other hand, a preparation method of the above-mentioned stimulation acquisition dry electrode for muscle impedance measurement is provided, including the following steps:

[0015] Step 1, roughening and hole ablation: roughen the top surface of the inner hook-and-loop fastener single hook, and ablate the first laser ablation hole and the second laser ablation hole on the inner hook-and-loop fastener base and the outer hook-and-loop fastener base respectively;

[0016] Step 2, conductivity: immerse the laser-scanned and ablated inner hook-and-loop fastener in conductive silver paste, and after drying the moisture of the silver paste, a conductive layer is formed on the surface of the hook-and-loop fastener;

[0017] Step 3, enameled wire fixation: pass the enameled wire through the first laser ablation hole on the inner hook-and-loop fastener base and fix it;

[0018] Step 4, insulating glue sealing: put the inner hook-and-loop fastener with the enameled wire into an injection cup, inject insulating sealant into the injection cup, so that the bottom end of the inner hook-and-loop fastener single hook is wrapped adjacent to the inner hook-and-loop fastener base, and then cure the insulating sealant and take out the inner hook-and-loop fastener;

[0019] Step 5, dry electrode bonding: pass the enameled wire led out from the inner hook-and-loop fastener sealed with insulating sealant through the second laser ablation hole on the outer hook-and-loop fastener base, and bond the inner hook-and-loop fastener base and the outer hook-and-loop fastener base together with epoxy resin.

[0020] Furthermore, in Step 1, the following method is used to generate the roughened structure: scan the top of the inner hook-and-loop fastener single hook with a laser to cut cracks on its surface; or immerse the inner hook-and-loop fastener in nylon etching solution.

[0021] Furthermore, the nylon etching solution is one or more of the following corrosive liquids: concentrated sulfuric acid, concentrated hydrochloric acid, and concentrated nitric acid.

[0022] Furthermore, the conductive silver paste contains one or more of the following materials: silver powder, bisphenol A epoxy resin, methylimidazole, butyl acetate, tetraethyl titanate, and polyamide wax.

[0023] On yet another aspect, a stimulation acquisition device for muscle impedance measurement is provided, including a plurality of the above-mentioned stimulation acquisition dry electrodes for muscle impedance measurement, and further including a nylon cuff for binding to the muscle to be measured. The plurality of dry electrodes are bonded to the inner side of the nylon cuff through the outer hook-and-loop fastener single hooks, and the enameled wires of the dry electrodes pass through the enameled wire holes on the nylon cuff to be connected to an external controller.

[0024] Further, there are multiple rows and columns of enameled wire holes distributed on the nylon cuff. During measurement, the dry electrode can move between the positions of the enameled wire holes in each row and column to adjust the positions of the stimulating electrode and the collecting electrode.

[0025] The advantages of the stimulating and collecting dry electrode for muscle impedance measurement of the present invention are as follows:

[0026] 1. The conductive magic tape dry electrode is prepared with magic tape as the base, and the soft hook and pile structure can ensure high comfort, solving the problem of poor comfort during long-term wearing of the gel.

[0027] 2. The magic tape adopts a double-layer structure. The inner layer of the magic tape is in direct contact with the skin, and the outer layer of the magic tape adheres to the furry surface of the inner surface of the nylon cuff. When the nylon cuff is worn, the position of the electrode can be adjusted arbitrarily, and the electrode can be reused, solving the problem that the electrode cannot be reused when using the gel physiotherapy electrode.

[0028] 3. To solve the problem of low current stimulation efficiency, the hook and pile structure of the magic tape is adopted. The contact area between the single hook of the magic tape and the skin is much smaller than that of the planar electrode. Therefore, when electric stimulation is applied, the current is concentrated at the top of the single hook. At the same time, the bottom of the single hook of the magic tape is fixed by the insulating sealant. The sealant shortens the effective deformation length of the single hook, and the deformation only occurs in the unsealed area, thereby reducing the overall bending amplitude, improving the anti-bending property of the single hook, increasing the contact force between the hook and pile and the skin, and making the current more concentrated in the target area during electric stimulation, and the stimulating current is more focused, so that the current value issued by the controller is lower when the same stimulating effect is achieved.

[0029] 4. The surface of the single hook of the magic tape has a roughened structure, increasing the surface area of the magic tape per unit volume. Therefore, when soaking in the conductive silver paste to form the silver paste conductive layer, more conductive particles can be adsorbed, thereby further enhancing the conductivity of the dry electrode. Description of the Drawings

[0030] Through the following description with reference to the drawings, the above and / or other features and advantages of the present invention will become more readily understood. The drawings are not drawn to scale, and some features are enlarged or reduced to show the details of specific components. In the drawings:

[0031] Figure 1 is a side view of the stimulating and collecting dry electrode for muscle impedance measurement of the present invention;

[0032] Figure 2 is a perspective view of the stimulating and collecting dry electrode for muscle impedance measurement of the present invention;

[0033] Figure 3 is the preparation process flow of the stimulating and collecting dry electrode for muscle impedance measurement of the present invention Figure 1 ;

[0034] Figure 4 is the preparation process flow of the stimulation acquisition dry electrode for muscle impedance measurement of the present invention Figure 2 ;

[0035] Figure 5 is the perspective view of the stimulation acquisition device for muscle impedance measurement of the present invention;

[0036] Figure 6 is the working principle diagram of the stimulation acquisition device for muscle impedance measurement of the present invention;

[0037] Figure 7 is the working principle diagram of the free movement of the electrode during the use of the stimulation acquisition device for muscle impedance measurement of the present invention.

[0038] In the figure: 100 - dry electrode; 1 - inner layer magic tape, 11 - inner layer magic tape base, 12 - inner layer magic tape single hook, 13 - crack, 14 - first laser ablation hole; 2 - outer layer magic tape, 21 - outer layer magic tape base, 22 - outer layer magic tape single hook; 3 - enameled wire; 4 - insulating sealant; 5 - silver paste conductive layer; 6 - epoxy resin; 101 - conductive silver paste; 102 - metal fixing ball; 103 - injection cup; 104 - liquid insulating sealant; 105 - nylon etching solution; 200 - nylon cuff; 201 - hook surface of nylon cuff, 202 - enameled wire hole; 203 - furry surface of inner layer nylon cuff; 204 - furry surface of outer layer nylon cuff; 205 - controller. Specific embodiments

[0039] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is for illustrative purposes only and does not limit the present invention.

[0040] It should be noted that in the context of the present invention, the orientation or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise" and "counterclockwise" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0041] In addition, terms such as "first" and "second" are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0042] The present invention provides a stimulation acquisition dry electrode for muscle impedance measurement, a preparation method of the dry electrode, and a stimulation acquisition device for muscle impedance measurement including the dry electrode. The electrode is used as a stimulation dry electrode and an acquisition dry electrode for muscle impedance measurement, which has very important practical value and innovative significance for long-term and convenient measurement of muscle impedance, and can effectively solve the existing problems of poor electrode wearing comfort, non-reusable electrodes, and low current stimulation efficiency.

[0043] First, refer to Figures 1 to 2 A detailed description is given of the stimulation acquisition dry electrode for muscle impedance measurement provided by the present invention.

[0044] The stimulation acquisition dry electrode for muscle impedance measurement as an exemplary embodiment of the present invention includes an inner magic tape 1, an outer magic tape 2, and an enameled wire 3. The inner magic tape 1 serves as the acquisition and stimulation surface for direct contact with the skin to perform epidermal muscle electrical stimulation and epidermal electrophysiological signal acquisition. The outer magic tape 2 serves as the bonding surface for adhesion to the rough surface of the nylon cuff to freely fix the positions of the stimulation electrode and the acquisition electrode. The enameled wire 3 is used to lead out electrophysiological signals and can be connected to an external controller to send signals to it. Therefore, the present invention prepares a conductive magic tape dry electrode with a magic tape as the base, and the soft hook and loop structure can ensure high comfort, solving the problem of poor comfort during long-term wearing of gel. In addition, the magic tape adopts a double-layer structure inside and outside. The inner magic tape is in direct contact with the skin, and the outer magic tape adheres to the rough surface of the inner surface of the nylon cuff. The position of the electrode can be adjusted arbitrarily when the nylon cuff is worn, and the electrode can be reused, solving the problem that the gel physical therapy electrode cannot be reused.

[0045] In this dry electrode, the inner magic tape 1 includes an inner magic tape base 11 and a plurality of inner magic tape single hooks 12, and the inner magic tape base 11 can be in a disc shape. With this structure, the contact area between the magic tape single hook and the skin is much lower than that of a planar electrode. Therefore, when electrical stimulation is applied, the current is concentrated at the tip of the single hook. To solve the problem of low current stimulation efficiency, in the present invention, the bottom end of each inner magic tape single hook 12 is wrapped by an insulating sealant 4 adjacent to the inner magic tape base 11 to improve the anti-bending property of the single hook, increase the contact force between the single hook and the skin during impedance measurement, and concentrate the current at the tip of the single hook during electrical stimulation. Specifically, the stiffness of the unsealed single hook is significantly increased (a short cantilever beam is more difficult to bend than a long cantilever beam). According to Hooke's law (F = kΔx), under the same external force, the greater the stiffness, the stronger the reaction force generated, thereby increasing the contact force between the single hook and the skin during impedance measurement, and making the current more concentratedly distributed in the target area during electrical stimulation.

[0046] The top surface of each inner - layer hook - and - loop fastener single - hook 12, that is, the surface in contact with the skin, has a roughened structure. The roughened structure can be a crack 13 cut by laser or a structure after impregnation with nylon etching solution. The nylon etching solution is one or more of the following corrosive liquids: concentrated sulfuric acid, concentrated hydrochloric acid, and concentrated nitric acid. There is a silver - paste conductive layer 5 on the surface of each inner - layer hook - and - loop fastener single - hook 12. The roughened structure obtained by laser ablation of cracks or impregnation with nylon etching solution can increase the surface area of the hook - and - loop fastener per unit volume, so as to adsorb more silver particles when soaking the conductive silver paste, further enhancing the conductivity of the dry electrode.

[0047] On the inner - layer hook - and - loop fastener base 11, especially at the center of the base, there is a first laser - ablation hole 14 (marked in Figure 3 ), which is used to fix the enameled wire 3. In particular, the enameled wire 3 can be fixed at the center of the bottom of the inner - layer hook - and - loop fastener through the tail - end metal fixing ball 102 (shown in Figure 3 ).

[0048] The outer - layer hook - and - loop fastener 2 is bonded to the inner - layer hook - and - loop fastener 1 through epoxy resin 6. Similar to the structure of the inner - layer hook - and - loop fastener 1, the outer - layer hook - and - loop fastener 2 includes an outer - layer hook - and - loop fastener base 21 and a plurality of outer - layer hook - and - loop fastener single - hooks 22. The shape of the outer - layer hook - and - loop fastener base 21 is adapted to the inner - layer hook - and - loop fastener base 11. The inner - layer hook - and - loop fastener base 11 and the outer - layer hook - and - loop fastener base 21 are bonded through epoxy resin 6. That is to say, the inner - layer hook - and - loop fastener single - hooks 12 and the outer - layer hook - and - loop fastener single - hooks 22 are back - to - back with each other. There is a second laser - ablation hole (not marked in the figure) on the outer - layer hook - and - loop fastener base 21 for fixing the enameled wire 3, which is particularly located at the center of the base 21. The enameled wire 3 passes through the first laser - ablation hole 14, leads out from the inner - layer hook - and - loop fastener 1, and then passes through the second laser - ablation hole and leads out to the outside.

[0049] According to the present invention, the inner - layer hook - and - loop fastener 1 and the outer - layer hook - and - loop fastener 2 are made of one or more of the following soft - elastic materials: nylon, fiber, and polyester. The insulating sealant 4 can be made of one or more of the following polymer materials: polyurethane, polysiloxane, butyl rubber, chloroprene rubber, acrylate, and acrylate alcohol.

[0050] In addition, the insulating layer of the enameled wire 3 is made of one or more of the following materials: acetal, polyester, polyurethane, and polyesterimide. The conductive layer of the enameled wire 3 is made of one or both of the following highly conductive materials: copper and silver.

[0051] In some embodiments of the present invention, the length of the inner hook-and-loop single hook 12 is 1-5 mm, the diameter is 0.5-1.5 mm, the diameter of the inner hook-and-loop base 11 is 5-15 mm, especially 10 mm, the thickness of the silver paste conductive layer 5 is 300-500 μm, and the height of the insulating sealant 4 is 1-4 mm. Additionally, preferably, the diameter of the enameled wire 3 is 0.5-5 mm, the diameter of the metal fixing ball is 1-10 mm, and the diameters of the first and second laser ablation holes are 0.5-5 mm. The length of the hook-and-loop single hook being 1-5 mm is to penetrate the fine hairs, the 10 mm diameter of the hook-and-loop bottom surface is a common size of electrodes on the market, the thickness of the silver paste conductive layer is to ensure the conductivity of the electrode, the 1-4 mm height of the sealant can ensure that the hook-and-loop of the electrode is not easily bent when contacting the skin, and the diameter of the metal fixing ball being larger than that of the ablation hole is to ensure that the metal fixing ball can be stuck at the bottom of the hook-and-loop of the hook-and-loop to fix the enameled wire. The diameter of the nylon cuff hole being smaller than the diameter of the hook-and-loop bottom surface can prevent the electrode from falling off.

[0052] Next, refer to Figure 3 and Figure 4 to describe the preparation method for preparing the above-mentioned stimulation acquisition dry electrode for muscle impedance measurement provided by the present invention.

[0053] The preparation method as an exemplary embodiment of the present invention includes the following steps:

[0054] Step S1, roughening and hole ablation: Generate a roughened structure on the top surface of the inner hook-and-loop single hook 12, and respectively ablate the first laser ablation hole 14 and the second laser ablation hole on the inner hook-and-loop base 11 and the outer hook-and-loop base 21;

[0055] Step S2, conductivity: Immerse the laser-scanned and ablated inner hook-and-loop 1 into the conductive silver paste 101, and after drying the moisture of the silver paste, form a conductive layer on the surface of the hook-and-loop;

[0056] Step S3, enameled wire fixation: Pass the enameled wire 3 through the first laser ablation hole 14 on the inner hook-and-loop base 11 and fix it;

[0057] Step S4, insulating glue sealing: Place the inner hook-and-loop 1 with the enameled wire 3 passed through it into the injection cup 103, inject the insulating sealant 104 into the injection cup 103, so that the bottom end of the inner hook-and-loop single hook 12 is wrapped at the adjacent position of the inner hook-and-loop base 11, and then cure the insulating sealant 4 and take out the inner hook-and-loop 1;

[0058] Step S5, dry electrode bonding: Pass the enameled wire 3 led out from the inner hook-and-loop 1 sealed with the insulating sealant 4 through the second laser ablation hole on the outer hook-and-loop base 21, and bond the inner hook-and-loop base 11 and the outer hook-and-loop base 21 together with the epoxy resin 6.

[0059] Refer toFigure 3 , in one embodiment, the preparation method of the present invention includes:

[0060] The first step (a): roughening and pore ablation. Set the laser scanning parameters (scanning frequency: 1000 Hz; scanning current: 8 A; scanning times: 2 times). Use a laser to cut the inner layer of the magic tape 1. Cracks 13 are generated on the surface of the single hooks 12 of the inner layer of the magic tape. Use a laser to cut the base 11 of the inner layer of the magic tape, and a first laser ablation hole 14 is ablated at the center position. At the same time, a second laser ablation hole can be ablated at the center of the base 21 of the outer layer of the magic tape;

[0061] The second step (b): conductivity. Immerse the cut magic tape completely in the conductive silver paste 101 for 10 seconds. After soaking, take it out and put it in an oven to dry the moisture (oven temperature: 70 °C, drying time: 60 min). After drying, a silver paste conductive layer 5 with a thickness of 300 μm is formed on the surface of the inner layer of the magic tape 1. The diameter of the single hooks 12 of the inner layer of the magic tape is 700 μm, and the diameter of the base 11 of the inner layer of the magic tape is 10 mm;

[0062] The third step (c): enameled wire fixation. Place the metal fixing ball 102 (diameter: 1 mm) at one end of the enameled wire 9 (diameter: 0.5 mm) at the center of the base 11 of the inner layer of the magic tape, and the other end passes through the first laser ablation hole 14 (diameter: 0.6 mm) at the center of the base 11 of the inner layer of the magic tape;

[0063] The fourth step (d): insulation glue sealing. Spray the release agent into the injection cup 103 and let it dry naturally. Place the inner layer of the magic tape 1 with the enameled wire passed through at the bottom of the injection cup 103. The enameled wire 3 is led out from the laser ablation hole at the center of the bottom of the injection cup 103. Inject the liquid insulation sealing glue 104 into the injection cup so that part of the single hooks 12 of the inner layer of the magic tape are exposed. The height of the liquid insulation sealing glue 104 is 2 mm. Heat to cure the liquid insulation sealing glue 104 (temperature: 70 °C, time: 30 min), and then take out the magic tape with the solid insulation sealing glue 4 from the injection cup 103;

[0064] The fifth step (e): dry electrode bonding. Bond the base 21 of the outer layer of the magic tape with the second laser ablation hole and the base 11 of the inner layer of the magic tape with the solid insulation sealing glue 4 together with the epoxy resin 6. Pass the enameled wire 3 led out from the inner layer of the magic tape through the laser ablation hole at the center of the base 21 of the outer layer of the magic tape and lead it out.

[0065] Referring to Figure 4 , in another embodiment, the preparation method of the electrode prepared by the immersion roughening method of the present invention includes:

[0066] The first step (a): Hole ablation. Set the laser scanning parameters (scanning frequency: 1000 Hz; scanning current: 8 A; scanning times: 2 times). Laser scan the inner magic tape base 11 to ablate the first laser ablation hole 14 at the center position. At the same time, the second laser ablation hole can be ablated at the center of the outer magic tape base 21.

[0067] The second step (b): Roughening. Immerse the inner magic tape with the laser ablation hole 14 in the nylon etching solution 105, and take it out and dry it after 1 minute (temperature: 70 °C, time: 30 min). After the magic tape reacts with the nylon etching solution 105, the single hooks 12 and the inner magic tape base 11 of the inner magic tape become rough.

[0068] The third step (c): Conductivization. Immerse the roughened magic tape completely in the conductive silver paste 101 for 10 seconds. After immersion, take it out and put it in an oven to dry the moisture (oven temperature: 70 °C, drying time: 60 min). After drying, a silver paste conductive layer 5 with a thickness of 300 μm is formed on the surface of the inner magic tape 1.

[0069] The fourth step (d): Enameled wire fixation. Place the metal fixing ball 102 (diameter: 1 mm) at one end of the enameled wire 3 (diameter: 0.5 mm) at the center of the inner magic tape base 11, and the other end passes through the laser ablation hole (diameter: 0.6 mm) at the center of the inner magic tape base 11.

[0070] The fifth step (e): Insulating glue sealing. Spray the release agent into the injection cup 103 and let it dry naturally. Put the inner magic tape 1 with the enameled wire passed through it at the bottom of the injection cup 103. The enameled wire 3 is led out from the laser ablation hole at the center of the bottom of the injection cup 103. Inject the liquid insulating sealant 104 into the injection cup so that part of the single hooks 12 of the inner magic tape are exposed. The height of the liquid insulating sealant 104 is 2 mm. Heat to cure the liquid insulating sealant 104 (temperature: 70 °C, time: 30 min), and then take out the magic tape with the solid insulating sealant 4 from the injection cup 103.

[0071] The sixth step (f): Dry electrode bonding. Bond the outer magic tape base 21 with the laser ablation hole and the inner magic tape base 11 with the solid insulating sealant 4 together with the epoxy resin 6, and lead the enameled wire 3 out from the laser ablation hole at the center of the outer magic tape base 21.

[0072] In the present invention, after the magic tape is roughened, the surface area of the magic tape per unit volume can be increased, so that more conductive silver particles can be adsorbed, the thickness of the silver paste conductive layer 5 can be increased, the conductivity of the magic tape electrode can be improved, and at the same time, the interfacial adhesion between the magic tape and the conductive silver paste 101 can be increased, and the silver paste conductive layer is not easy to fall off.

[0073] In an alternative embodiment, the nylon etching solution is one or more of the following highly corrosive liquids: concentrated sulfuric acid, concentrated hydrochloric acid, and concentrated nitric acid. In addition, the conductive silver paste contains one or more of the following materials: silver powder, bisphenol A epoxy resin 6, methylimidazole, butyl acetate, tetraethyl titanate, and polyamide wax.

[0074] Finally, refer to Figures 5 to 7 A stimulus acquisition device for muscle impedance measurement provided by the present invention will be described.

[0075] Refer to Figure 5 and Figure 6 , the stimulus acquisition device for muscle impedance measurement as an exemplary embodiment of the present invention includes a plurality of the above-mentioned stimulus acquisition dry electrodes 100 for muscle impedance measurement, preferably including four dry electrodes 100, and further includes a nylon cuff 200 for being strapped to the muscle to be measured. When the nylon cuff 200 is fixed, the nylon cuff hook surface 201 and the outer nylon cuff fuzzy surface 204 are adhered together, and the fixing tightness can be adjusted, and the nylon cuff 200 can rotate. The plurality of dry electrodes 100 are adhered to the inner side of the nylon cuff through the outer magic tape single hook 22 and adhered to the inner nylon cuff fuzzy surface 203.

[0076] The enameled wire 3 of each dry electrode passes through the corresponding enameled wire hole 202 on the nylon cuff to be connected to the external controller 205. As Figure 6 shown, the two outer electrodes on the inner side of the nylon cuff 200 are used to apply alternating current (high current and low current), and the voltage generated is measured through the two inner electrodes (high voltage and low voltage). The controller 205 can adjust the voltage and current magnitudes of the four-channel electrodes. To avoid mutual interference between the controller 205 and the dry electrodes 100, the positions of the controller 205 and the dry electrodes 100 can be at a relatively large distance.

[0077] Refer to Figure 7 , in a specific embodiment, multiple rows and columns of enameled wire holes 202 are distributed on the nylon cuff 200, and the adjacent enameled wire holes 202 can be 25 mm apart. During the measurement, the dry electrodes can move between the positions of the enameled wire holes 202 in each row and column to adjust the positions of the stimulating electrodes and the collecting electrodes. The dry electrodes 100 can be freely placed at any position on the inner nylon cuff fuzzy surface 203. When the dry electrodes 100 are not located at the center of the enameled wire hole 19, the enameled wire 3 can be stretched through the enameled wire hole 202. The muscle impedance measurement result depends on the relative positions of the electrodes. With this nylon cuff 200, the positions of the stimulating electrodes and the collecting electrodes can be adjusted arbitrarily. The four electrodes (two collecting electrodes and two stimulating electrodes) can freely move from position A to position B, and at the same time, the positions of the four electrodes in the nylon cuff and the spacing between adjacent electrodes can be adjusted. As shown in C, by reasonable adjustment, the experimental error can be minimized to the greatest extent.

[0078] As described above, the stimulation acquisition dry electrode for muscle impedance measurement provided by the present invention can effectively solve the existing problems of poor electrode wearing comfort, non-reusability of electrodes, and low current stimulation efficiency.

[0079] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention can be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or replace the corresponding features in other embodiments. The technical solutions obtained by such combination or replacement should also be regarded as being included within the protection scope of the present invention.

Claims

1. A stimulation collection dry electrode for muscle electrical impedance measurement, characterized in that: It includes an inner Velcro, an outer Velcro and an enameled wire; the inner Velcro is used to directly contact the skin to perform epidermal muscle electrical stimulation and epidermal electrophysiological signal collection; the outer Velcro is used to adhere to the fleece surface of the nylon cuff to fix the electrode position; the enameled wire is used to lead out electrophysiological signals; The inner layer Velcro includes an inner layer Velcro base and a plurality of inner layer Velcro hooks, the bottom end of each inner layer Velcro hook is wrapped by an insulating sealant at a position adjacent to the inner layer Velcro base, the top surface has a roughened structure, the surface of each inner layer Velcro hook has a silver paste conductive layer, and the inner layer Velcro base has a first laser ablation hole; The outer Velcro is bonded to the inner Velcro by epoxy resin, and comprises an outer Velcro base and a plurality of outer Velcro single hooks, wherein the outer Velcro base is provided with a second laser ablation hole; The enameled wire passes through the first laser ablation hole, is led out from the inner Velcro, and then passes through the second laser ablation hole, is led out to the outside.

2. The stimulation collection dry electrode for muscle electrical impedance measurement according to claim 1, characterized in that: The roughened structure is a crack cut by laser or a structure immersed in nylon corrosive liquid.

3. The stimulation collection dry electrode for muscle electrical impedance measurement according to claim 1 or 2, characterized in that: The insulating sealant is made of one or more of the following polymer materials: polyurethane, polysiloxane, butyl rubber, chloroprene rubber, acrylate and acrylate alcohol; The inner layer Velcro and the outer layer Velcro are made of one or more of the following elastic materials: nylon, fiber and polyester; The insulating layer of the enameled wire is made of one or more of the following materials: acetal, polyester, polyurethane and polyesterimide; The conductive layer of the enameled wire adopts one or both of the following conductive materials: copper and silver.

4. The stimulation collection dry electrode for muscle electrical impedance measurement according to claim 1 or 2, characterized in that: The length of the inner Velcro single hook is 1-5 mm, the diameter is 0.5-1.5 mm, the diameter of the inner Velcro base is 5-15 mm, the thickness of the silver paste conductive layer is 300-500 μm, and the height of the insulating sealant is 1-4 mm.

5. A method for preparing a stimulation collection dry electrode for measuring muscle electrical impedance according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1, roughening and hole ablation: roughening the top surface of the inner Velcro single hook, and ablating a first laser ablation hole and a second laser ablation hole on the inner Velcro base and the outer Velcro base respectively; Step 2, conductivity: the inner layer of Velcro after laser scanning and ablation is immersed in conductive silver paste, and a conductive layer is formed on the surface of the Velcro after the water in the silver paste is dried; Step 3, fixing the enameled wire: passing the enameled wire through the first laser ablation hole on the inner Velcro base and fixing it; Step 4, insulating glue sealing: put the inner Velcro with the enameled wire into the injection cup, inject the insulating sealant into the injection cup so that the bottom end of the inner Velcro single hook is wrapped adjacent to the base of the inner Velcro, then solidify the insulating sealant and take out the inner Velcro; Step 5, dry electrode bonding: pass the enameled wire led out of the inner Velcro sealed with insulating sealant through the second laser ablation hole on the outer Velcro base, and bond the inner Velcro base and the outer Velcro base together with epoxy resin.

6. The preparation method according to claim 5, characterized in that: In step 1, the roughened structure is produced by: scanning the top of the single hook of the inner Velcro with a laser to cut a crack on its surface; or immersing the inner Velcro in a nylon corrosive solution.

7. The preparation method according to claim 6, characterized in that: The nylon corrosive liquid is one or more of the following corrosive liquids: concentrated sulfuric acid, concentrated hydrochloric acid and concentrated nitric acid.

8. The preparation method according to claim 5 or 6, characterized in that: The conductive silver paste contains one or more of the following materials: silver powder, bisphenol A epoxy resin, methylimidazole, butyl acetate, tetraethyl titanate and polyamide wax.

9. A stimulation acquisition device for measuring muscle electrical impedance, characterized in that: It comprises a plurality of stimulation collection dry electrodes for measuring muscle electrical impedance as claimed in any one of claims 1 to 4, and also comprises a nylon cuff for being attached to the measured muscle, wherein the plurality of dry electrodes are adhered to the inner side of the nylon cuff by the single hook of the outer Velcro, and the enameled wire of the dry electrode passes through the enameled wire hole on the nylon cuff to be connected to an external controller.

10. The stimulation acquisition device for muscle electrical impedance measurement according to claim 9, characterized in that: The nylon cuff is provided with multiple rows and columns of enameled wire holes. During measurement, the dry electrode can move between the positions of the rows and columns of enameled wire holes to adjust the positions of the stimulation electrode and the collection electrode.

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