An electrode sheet for auditory brainstem response detection and a method of using the same

Abstract

The application discloses an electrode sheet for auditory evoked potential detection and a use method thereof, which comprises a skin-friendly layer, a conductive layer and a bearing layer arranged in sequence in the thickness direction of the electrode sheet, wherein the skin-friendly layer comprises a leakage-stopping rubber ring located at an outer ring, a physiotherapy rubber block arranged at an inner ring of the leakage-stopping rubber ring and a non-woven fabric, the non-woven fabric is located at a side away from the conductive layer and covers the physiotherapy rubber block; the physiotherapy rubber block comprises a temperature-sensitive solvent and solute particles arranged in the temperature-sensitive solvent, the temperature-sensitive solvent can change with temperature and transform between solid and liquid states; through the coating cooperation of the temperature-sensitive solvent and the solute particles in the skin-friendly layer, the electrode sheet can warm, massage and medicate the used object before auditory evoked detection, thereby providing effective calming effect, and the solute particles provide a uniform and stable current channel, thereby ensuring the stability of evoked electrical signals and the safety of external input current.

Description

Technical Field

[0001] This invention relates to the field of testing or medical devices, and more particularly to an electrode pad for detecting auditory evoked potentials and its method of use. Background Technology

[0002] Auditory evoked potentials, also known as brainstem auditory evoked potentials, refer to the bioelectrical activity generated when short sounds are emitted through headphones and stimulated by the auditory nerve originating from the brainstem. This bioelectrical activity is collected and recorded by electrodes placed on the scalp to obtain an evoked potential map. It is mainly used for objective evaluation of hearing, diagnosis of multiple sclerosis, brain death, cerebellopontine angle tumors, and surgical monitoring.

[0003] Since its discovery, the clinical applications of auditory evoked responses (ABRs) have been continuously expanding: ABRs can be used to predict hearing thresholds, especially for patients who have difficulty cooperating with behavioral hearing tests, such as newborns, patients with cognitive impairment, and subjects who are faking or exaggerating their hearing loss; ABRs can be used to differentiate between conductive, sensorineural, and retrocochlear lesions; ABRs can be used for intraoperative detection, for example, in patients with acoustic neuromas, ABRs can be used to determine whether the auditory system is damaged during surgery, providing a reference for surgeons to implement surgical plans.

[0004] Electrodes used to collect bioelectric signals need to be attached to the human body surface. This is usually done by applying alcohol, then exfoliating, and then attaching the electrode. However, excessive friction can increase the discomfort and make it difficult for patients to calm down. In addition, some children cannot cooperate well during evoked potential tests, which can lead to inaccurate test results. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and provides an electrode sheet for auditory evoked potential detection and its usage method. Through the coating and combination of temperature-sensitive solvent and solute particles in the skin-friendly layer, the electrode sheet can heat, massage, and administer medication to the subject before auditory evoked potential detection, thereby providing an effective sedative effect. Furthermore, the solute particles provide a uniform and stable current channel, ensuring the stability of the evoked signal and the safety of the external input current.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an electrode sheet for auditory evoked potential detection, comprising: a skin-friendly layer, a conductive layer, and a carrier layer, wherein the skin-friendly layer, the conductive layer, and the carrier layer are arranged sequentially in the thickness direction;

[0007] The conductive layer is made of conductive polymers, such as silver / silver chloride materials, or conductive fibers, such as silver, copper and other metal wires; the support layer is a flexible polyester film that can support the conductive layer, thereby adapting to the curved shape of the skin at different locations, and has a certain degree of elasticity, which can meet the expansion requirements of solute particles while avoiding the overall displacement of the electrode sheet.

[0008] The skin-friendly layer includes a leak-proof rubber ring on the outer ring, which can closely adhere to human skin and fit the therapeutic rubber block and non-woven fabric set in the inner ring of the leak-proof rubber ring. When the release film is not removed, the therapeutic rubber block is flat and parallel to the bottom surface of the leak-proof rubber ring. The non-woven fabric is located on the side away from the conductive layer and can cover the therapeutic rubber block.

[0009] In one embodiment, the nonwoven fabric can cover the therapeutic adhesive block alone, and its sides are attached to the inner ring wall of the leak-proof adhesive ring.

[0010] In one embodiment, the nonwoven fabric can also completely cover the therapeutic adhesive block and the leak-proof rubber ring, and the edges are attached to the outer ring wall of the leak-proof rubber ring.

[0011] The therapeutic gel block includes a temperature-sensitive solvent and solute particles disposed in the temperature-sensitive solvent. The temperature-sensitive solvent can change between solid and liquid states with temperature changes. When the temperature rises, the temperature-sensitive solvent melts into a liquid state, and the solute particles are exposed and can absorb the temperature-sensitive solvent. When the temperature drops, the temperature-sensitive solvent solidifies and can fix the solute particles it contacts.

[0012] In a preferred embodiment of the present invention, the solute particles are conductive silicone particles or conductive foam with internal pores; the solvent is a thermosensitive hydrogel, and the conductive silicone particles can be prepared by adding a dispersant and then using a gelation method or a pyrolysis method.

[0013] In a preferred embodiment of the present invention, when the temperature-sensitive solvent is initially solid, the solute particles are completely coated by the temperature-sensitive solvent, and at this time the surface of the physiotherapy gel block is flat.

[0014] In a preferred embodiment of the present invention, after the temperature-sensitive solvent is liquefied, the solute particles detach from the limiting position and can apply pressure to the nonwoven fabric. When the solute particles are attached to the surface of the human body downwards, they can provide pressure to the nonwoven fabric by relying on their own gravity, thereby indirectly massaging the surface of the human body, relieving pressure, and promoting drug absorption.

[0015] In one embodiment, the fabric is laterally fitted to the human body. The movement of solute particles cannot directly apply pressure to the nonwoven fabric. The pressure is applied by the solute particles absorbing the liquid phase hydrogel and then expanding upon heating, which is a relatively slow process.

[0016] In a preferred embodiment of the present invention, the surface of the nonwoven fabric is distributed with thick nonwoven fabric areas and thin nonwoven fabric areas. Several of the thin nonwoven fabric areas are regularly arranged on the surface of the nonwoven fabric. After the nonwoven fabric is wetted by the liquefied hydrogel, it has a certain degree of stretchability, which is more obvious in the thinner areas. After the solute particles fall or expand, they can fall into the thick nonwoven fabric areas one by one, thereby obtaining a better pressure effect.

[0017] In a preferred embodiment of the present invention, a release film is attached to the side of the skin-friendly layer opposite to the conductive layer for easy storage, transportation and retrieval.

[0018] In a preferred embodiment of the present invention, a sedative drug, such as lidocaine or bupivacaine, is added to the solvent to help the patient relax and reduce anxiety and pain.

[0019] In a preferred embodiment of the present invention, the conductive layer is connected to an external signal receiving device via a connecting wire. The connecting wire is fixed by extending from the side, or better yet, by extending from the top layer via a connecting buckle, which makes it easier to replace the input and output external devices.

[0020] The present invention also provides a method for using electrode pads for auditory evoked potential detection, characterized by comprising the following steps:

[0021] A. An external current is output to the conductive layer of the electrode sheet. The conductive layer heats up to the point where the temperature-sensitive solvent liquefies. The solute particles absorb the temperature-sensitive solvent and expand. The solute particles disperse and apply pressure to the non-woven fabric, which has a massaging and relaxing effect on the muscles. The microcurrent also promotes the absorption of sedative drugs.

[0022] B. When the external current input is stopped, the temperature of the conductive layer drops to room temperature, the solute particles solidify and set, and fix the attachment surface.

[0023] C. Replace the electrode connection components, then perform sound stimulation, and receive the induced electrophysiological signals through the electrode pads.

[0024] In a preferred embodiment of the present invention, after auditory evoked detection, the non-woven fabric and physiotherapy gel block are removed, the electrode pads are cleaned and a new physiotherapy gel block is inserted, and then covered with non-woven fabric. The non-woven fabric can be fixed to the leak-proof rubber ring by heat fusion, or it can be connected by a more convenient and non-damaging snap-fit ​​method. A slit is made on the side wall of the leak-proof rubber ring, and the non-woven fabric is directly stuffed into the slit. The non-woven fabric is fixed and connected by the elastic force of the leak-proof rubber ring body.

[0025] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0026] This invention incorporates a skin-friendly layer capable of solid-liquid transformation between the electrode pad and the human body. Through the encapsulation of thermosensitive solvents and solute particles, the electrode pad can be heated, massaged, and treated with medication before auditory evoked detection, thereby providing an effective sedative effect. By combining physical pressure, temperature, and drug effects, discomfort and tension are avoided for the recipient, ensuring the smooth conduct of auditory evoked detection and accurate acquisition of electrical signal data.

[0027] In this invention, the thermosensitive hydrogel can liquefy at a low temperature that is comfortable for the user, without the need for excessive current heating, thus avoiding excessive stimulation to the user. In some embodiments of the thermosensitive hydrogel, it can even liquefy at body temperature without additional current heating. At the same time, the non-woven fabric and leak-proof rubber ring can prevent excessive leakage after liquefaction, avoiding contamination of the patient's skin and clothing. Furthermore, keeping the liquid phase thermosensitive hydrogel in a limited space allows the solute particles to fully absorb the liquid phase gel and thus fully expand.

[0028] In this invention, the solute particles are completely encapsulated in the solvent block in the initial state, which can achieve a smooth surface, so that there is no foreign body sensation when the electrode pad is attached to the human body surface. When the hydrogel solvent block liquefies, the solute particles can apply pressure and massage to the non-woven fabric and the human body surface through the non-woven fabric. Furthermore, the solute particles become porous, which can absorb the liquefied gel when heated and expanded, thereby increasing their volume and further increasing the pressure on the human body surface. In addition, during the pressure and massage process, the sedative or anesthetic drugs carried in the electrode pad can also be activated.

[0029] In addition, after the solute particles expand and solidify, they can independently adhere to the corresponding skin, thus adapting to different human body locations. This ensures that any solute particle can form a current channel between the human body and the conductive layer, thereby avoiding burns to the human body surface due to single-point contact at uneven adhesion points. It also ensures the accuracy of the received induced electrical signals.

[0030] In this invention, non-woven fabric is used to coat the physiotherapy gel block. When the hydrogel solvent block liquefies, some of the hydrogel can wet the non-woven fabric, thereby improving the stretchability of the non-woven fabric. This allows the solute particles to apply pressure to the human body without damaging the non-woven fabric. At the same time, the electrode pads in this invention can be filled with sedative or anesthetic drugs. The non-woven fabric allows for the sustained release of the drugs. Typically, auditory evoked detection takes half an hour to an hour, requiring sustained drug release to provide a long-lasting sedative effect. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a perspective structural diagram of a preferred embodiment of the present invention;

[0033] Figure 2 This is a back structure diagram of a preferred embodiment of the present invention;

[0034] Figure 3 This is a side view of a preferred embodiment of the present invention;

[0035] In the diagram: 1. Bearing layer; 2. Conductive layer; 3. Solute particles; 4. Leak-proof rubber ring; 5. Connecting wire. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. In the description of the present invention, the reference to "embodiment", "one embodiment" or "other embodiment" indicates that a specific feature, structure or characteristic described in connection with the embodiment is included in at least some embodiments, but not necessarily all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0038] like Figure 1 as well as Figure 3 An electrode sheet for auditory evoked potential detection is shown, comprising: a skin-friendly layer, a conductive layer 2, and a carrier layer 1, wherein the skin-friendly layer, the conductive layer 2, and the carrier layer 1 are arranged sequentially in the thickness direction.

[0039] The conductive layer 2 is made of conductive polymers, such as silver / silver chloride materials, or conductive fibers, such as silver, copper and other metal wires; the support layer 1 is a flexible polyester film that can support the conductive layer 2, thereby adapting to the curved shape of the skin at different locations, and has a certain elasticity, which can meet the expansion requirements of solute particles 3 while avoiding the overall displacement of the electrode sheet.

[0040] In some embodiments, the conductive layer 2 is prepared by means of conductive wire fibers, using conductive filaments or wires that can be wound into spirals or other shapes, including metals such as silver and copper; when preparing the electrode sheet, fine silver wire or other metal wires are wound into a suitable shape and coated with metal salts or conductive adhesives to improve the conductivity and stability of the electrode. Then the electrode sheet is connected to an appropriate amplifier and data acquisition device to measure or record biosignals. In addition, the accuracy and stability of the measurement results are ensured by controlling factors such as the uniformity of fiber diameter, the surface smoothness of the electrode, and the selection of wire materials.

[0041] The skin-friendly layer includes a leak-proof rubber ring 4 located on the outer ring. The leak-proof rubber ring 4 can closely adhere to human skin and fit the therapeutic rubber block and non-woven fabric located on the inner ring of the leak-proof rubber ring 4. When the release film is not removed, the therapeutic rubber block is flat and parallel to the bottom surface of the leak-proof rubber ring 4. The non-woven fabric is located on the side away from the conductive layer 2 and can cover the therapeutic rubber block.

[0042] In one embodiment, the nonwoven fabric can cover the therapeutic adhesive block alone, and its sides are attached to the inner ring wall of the leak-proof adhesive ring 4.

[0043] In one embodiment, the nonwoven fabric can also completely cover the therapeutic adhesive block and the leak-proof rubber ring 4, and the surrounding area is attached to the outer ring wall of the leak-proof rubber ring 4.

[0044] The physiotherapy gel block includes a temperature-sensitive solvent and solute particles 3 disposed in the temperature-sensitive solvent. The temperature-sensitive solvent can change between solid and liquid states with temperature changes. When the temperature rises, the temperature-sensitive solvent melts into a liquid state, and the solute particles 3 are exposed and can absorb the temperature-sensitive solvent. When the temperature drops, the temperature-sensitive solvent solidifies and can fix the solute particles 3 in contact with it.

[0045] Preferably, the solute particles 3 are conductive silicone particles or conductive foam with internal pores; the solvent is a thermosensitive hydrogel, and the conductive silicone particles can be prepared by adding a dispersant and then using a gelation method or a pyrolysis method.

[0046] It should be noted that in some embodiments, the melting temperature of the thermosensitive hydrogel is higher than that of the human body, so it is necessary to use an external current to heat it appropriately to melt it. The current can also provide a certain soothing effect. In other preferred embodiments, the melting temperature of the thermosensitive hydrogel is close to the surface temperature of the human body. It can be directly attached to the surface of the human body to melt and release solute particles 3. For example, a chitosan / sodium glycerophosphate (CS / GP) thermosensitive gel is used. The chitosan concentration is adjusted and the thermosensitive gel is cross-linked to modify it so that it has a drug sustained-release effect. At the same time, the property of the thermosensitive gel to achieve a melt-gel transition when stimulated by temperature near the human body temperature is utilized.

[0047] When preparing silica gel particles, compounds such as PEG, SDS, and EDTA can be added as needed. These compounds affect the pore size and distribution of the silica gel particles. Specifically, preparation methods include gelation and pyrolysis.

[0048] Gelization method:

[0049] Prepare a mixture of tetraethyl silicate and water, add ammonia to make the solution acidic, then add the desired compound, stir the mixture at room temperature to form a gel, freeze-dry the gel at low temperature, then dry it at high temperature, and finally sieve the obtained silica particles to obtain silica particles with pores of different sizes.

[0050] Pyrolysis method:

[0051] Silicone oil is heated to a high temperature, and then compounds such as boric acid are added. The mixture is stirred to disperse the compounds evenly in the liquid. The liquid is then poured into a mold and evaporated at a high temperature to obtain silicone particles. It should be noted that the silicone particles prepared by this method have uneven pore distribution, but the pore size can be controlled by changing the preparation conditions and adding different compounds.

[0052] In addition, in some embodiments, the solvent can also be a conductive adhesive. It should be noted that it is usually a viscous liquid and requires special storage and transportation methods such as refrigeration before use. The melting point of the conductive adhesive varies depending on its composition, but it can usually maintain a liquid gel state at room temperature without heating. The conductive adhesive includes conductive fillers, polymers, stabilizers, and additives. Fillers are the main materials in the conductive adhesive and usually have high conductivity, such as silver powder and carbon powder. Polymers are generally used to control the viscosity and plasticity of the conductive adhesive in order to prepare the optimal electrode shape. Stabilizers and additives can be used to adjust the viscosity, flowability, and stability of the conductive adhesive to ensure the stability and reusability of the electrode.

[0053] In this invention, the thermosensitive hydrogel can liquefy at a low temperature that is comfortable for the user, without the need for excessive current heating, thus avoiding excessive stimulation to the user. In some embodiments of the thermosensitive hydrogel, it can even liquefy at body temperature without additional current heating. At the same time, the non-woven fabric and the leak-proof rubber ring 4 can prevent excessive leakage after liquefaction, avoiding contamination of the patient's skin and clothing. Furthermore, keeping the liquid phase thermosensitive hydrogel in a limited space allows the solute particles 3 to fully absorb the liquid phase gel and thus expand sufficiently.

[0054] In a preferred embodiment of the present invention, when the temperature-sensitive solvent is initially solid, the solute particles 3 are completely coated by the temperature-sensitive solvent, and at this time the surface of the physiotherapy gel block is flat.

[0055] In a preferred embodiment of the present invention, after the temperature-sensitive solvent is liquefied, the solute particles 3 detach from the limiting position and can apply pressure to the non-woven fabric. When the solute particles 3 are attached to the surface of the human body downwards, they can provide pressure to the non-woven fabric by relying on their own gravity, thereby indirectly massaging the surface of the human body, relieving pressure, and promoting drug absorption.

[0056] In this invention, the solute particles 3 are completely encapsulated in the solvent block in the initial state, which can achieve a smooth surface, so that there is no foreign body sensation when the electrode pad is attached to the human body surface. When the hydrogel solvent block liquefies, the solute particles 3 can apply pressure and massage to the non-woven fabric and the human body surface through the non-woven fabric. Furthermore, the solute particles 3 have internal pores, which can absorb the liquefied gel when heated and expanded, thereby increasing their volume and further increasing the pressure on the human body surface. In addition, during the pressure and massage process, the sedative or anesthetic drugs carried in the electrode pad can also be activated.

[0057] In addition, after the solute particles 3 expand and solidify, they can independently adhere to the corresponding skin, thus adapting to different human body positions. This ensures that any solute particle 3 can form a current channel between the human body and the conductive layer 2, thereby avoiding burns to the human body surface due to single-point contact at some uneven adhesion positions. It also ensures that the received induced electric signals are accurate.

[0058] In one embodiment, the nonwoven fabric is laterally fitted to the human body. The movement of the solute particles 3 cannot directly apply pressure to the nonwoven fabric. Instead, the pressure is applied by the solute particles 3 absorbing the liquid phase hydrogel and then expanding upon heating. This process is relatively slow.

[0059] This invention provides a skin-friendly layer capable of solid-liquid transformation between the electrode pad and the human body. Through the coating of temperature-sensitive solvent and solute particles 3, the electrode pad can be heated, massaged, and treated with medication before auditory evoked detection, thereby providing an effective sedative effect. By combining physical pressure, temperature, and drug effects, discomfort and tension are avoided for the user, thus enabling the auditory evoked detection to proceed smoothly and obtain accurate electrical signal data.

[0060] In one embodiment, the surface of the nonwoven fabric is distributed with thick nonwoven fabric areas and thin nonwoven fabric areas. Several thin nonwoven fabric areas are regularly arranged on the surface of the nonwoven fabric. After the nonwoven fabric is wetted by the liquefied hydrogel, it has a certain degree of stretchability, which is more obvious in the thinner areas. After the solute particles 3 fall or expand, they can fall into the thick nonwoven fabric areas one by one, thereby obtaining a better pressure effect.

[0061] It should be noted that when nonwoven fabrics are wetted, their dimensions expand, typically increasing by 10% to 25%. Changes in strength and extensibility: After wetting, the strength of nonwoven fabrics decreases significantly, while their extensibility increases dramatically. This is because moisture reduces the surface tension of the fibers, leading to a lower coefficient of friction between fibers, thus reducing cohesion and contact force, affecting their mechanical properties. Changes in porosity: After wetting, the porosity of nonwoven fabrics increases significantly, affecting their filtration and breathability. Changes in surface smoothness: After wetting, the surface of nonwoven fabrics becomes smoother, affecting their surface properties and protective performance.

[0062] This invention uses non-woven fabric to coat the physiotherapy gel block. When the hydrogel solvent block liquefies, some of the hydrogel can wet the non-woven fabric, thereby improving the stretchability of the non-woven fabric. This allows the solute particles 3 to apply pressure to the human body without damaging the non-woven fabric. At the same time, the electrode pads in this invention can be filled with sedative or anesthetic drugs. The non-woven fabric allows for the sustained release of the drugs. Typically, auditory evoked detection takes half an hour to an hour, requiring sustained drug release to provide a long-lasting sedative effect.

[0063] In a preferred embodiment of the present invention, a release film is attached to the side of the skin-friendly layer away from the conductive layer 2 for easy storage, transportation and use. The film is made of polymer materials such as polyimide (PI). In some embodiments, the electrode sheet is formed on the surface of the release film using conductive materials such as metal and carbon. The release film can protect and separate the electrode sheet after it is manufactured.

[0064] Specifically, release film has the following functions: protecting the electrode sheet: release film can prevent unwanted chemical reactions and oxidation during the manufacturing process of the electrode sheet, thereby improving the quality and stability of the electrode sheet.

[0065] In the manufacturing of electrode sheets, photolithography is used to pattern the release film, thereby forming the required electrode structure and channels. In this process, the release film acts as a template.

[0066] The solvent of this invention can be supplemented with sedative drugs to help patients relax and reduce anxiety and pain. The sedative drugs used include: lidocaine (local anesthetic): used for local anesthesia, reducing pain and discomfort; bupivacaine (local anesthetic): commonly used for local anesthesia during surgery, and can also reduce pain and discomfort during treatment; diazepam (local anesthetic): mainly used for local anesthesia in children, reducing pain and discomfort during treatment; and droperidol (local anesthetic): used for local anesthesia and reducing pain and discomfort during treatment, but should be used with caution to avoid causing impaired consciousness and unexpected reactions. In a preferred embodiment of this invention, the conductive layer 2 is connected to an external signal receiving device via a connecting wire 5. The connecting wire 5 is fixed by extending laterally, or as... Figure 2The design, which features a connector extending from the back of the upper layer, allows for easier replacement of input and output external devices.

[0067] Lidocaine is preferred, as it can be conveniently used in the form of creams, gels, patches, etc.

[0068] The present invention also provides a method for using electrode pads for auditory evoked potential detection, characterized by comprising the following steps:

[0069] A. An external current is output to the conductive layer 2 of the electrode sheet. The conductive layer 2 is heated to the point where the temperature-sensitive solvent is liquefied. The solute particles 3 absorb the temperature-sensitive solvent and expand. The solute particles 3 disperse and apply pressure to the non-woven fabric, which has the effect of massaging and relaxing muscles. The microcurrent also promotes the absorption of sedative drugs.

[0070] B. When the external current input is stopped, the temperature of the conductive layer 2 drops to room temperature, and the solute particles 3 solidify and set, thus fixing the attachment surface.

[0071] C. Replace the electrode connection components, then perform sound stimulation, and receive the induced electrophysiological signals through the electrode pads.

[0072] It should be noted that the electrode plates are connected to the external amplifier in the following way:

[0073] To connect the universal clip, insert the electrode plate end into the universal clip, and then connect the other end of the universal clip to the amplifier input port.

[0074] Welding connection: The electrode plate ports can be connected to the amplifier by welding.

[0075] A spring clip is used to press the electrode into the copper port, which is then connected to the amplifier.

[0076] Wireless connectivity: Some wireless connectivity methods can be applied to biosignal acquisition systems, which can wirelessly transmit biosignals collected by electrode pads to amplifiers.

[0077] In a preferred embodiment of the present invention, after auditory evoked detection, the non-woven fabric and physiotherapy gel block are removed, the electrode pads are cleaned and a new physiotherapy gel block is inserted, and then covered with non-woven fabric. The non-woven fabric can be fixed to the leak-proof rubber ring 4 by heat fusion, or it can be connected by a more convenient and non-damaging snap-fit ​​method. A slit is made on the side wall of the leak-proof rubber ring 4, and the non-woven fabric is directly stuffed into the slit. The non-woven fabric is fixed and connected by the elastic force of the leak-proof rubber ring 4 body.

[0078] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through the specific circumstances.

[0079] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An electrode pad for auditory evoked potential detection, comprising: The skin-friendly layer, the conductive layer, and the carrier layer are characterized by: The skin-friendly layer, the conductive layer, and the carrier layer are arranged sequentially in the thickness direction; The conductive layer is made of conductive polymer or conductive fiber; the supporting layer is a flexible polyester film capable of supporting the conductive layer. The skin-friendly layer includes a leak-proof rubber ring on the outer ring, a therapeutic rubber block disposed on the inner ring of the leak-proof rubber ring, and a non-woven fabric. The non-woven fabric is located on the side away from the conductive layer and covers the therapeutic rubber block. The therapeutic gel block includes a temperature-sensitive solvent and solute particles disposed in the temperature-sensitive solvent. The temperature-sensitive solvent can change between solid and liquid states with temperature. When the temperature rises, the temperature-sensitive solvent melts into a liquid state, and the solute particles are exposed and can absorb the temperature-sensitive solvent. When the temperature decreases, the temperature-sensitive solvent solidifies, which can fix the solute particles it contacts.

2. The electrode sheet for auditory evoked potential detection according to claim 1, characterized in that: The solute particles are conductive silicone particles or conductive foam with internal pores; the solvent is a thermosensitive hydrogel.

3. The electrode sheet for auditory evoked potential detection according to claim 1, characterized in that: When the temperature-sensitive solvent is initially solid, the solute particles are completely coated by the temperature-sensitive solvent, and at this time the surface of the physiotherapy gel block is flat.

4. The electrode sheet for auditory evoked potential detection according to claim 1, characterized in that: After the temperature-sensitive solvent is liquefied, the solute particles detach from their confinement and can apply pressure to the nonwoven fabric.

5. The electrode sheet for auditory evoked potential detection according to claim 1, characterized in that: The surface of the nonwoven fabric is distributed with thick nonwoven fabric regions and thin nonwoven fabric regions, and several of the thin nonwoven fabric regions are regularly arranged on the surface of the nonwoven fabric.

6. The electrode sheet for auditory evoked potential detection according to claim 1, characterized in that: A release film is attached to the side of the skin-friendly layer that is opposite to the conductive layer.

7. The electrode sheet for auditory evoked potential detection according to claim 1, characterized in that: The solvent contains a sedative drug.

8. The electrode sheet for auditory evoked potential detection according to claim 1, characterized in that: The conductive layer is connected to an external signal receiving device via a connecting line.

9. A method of using an electrode pad for auditory evoked potential detection according to any one of claims 1-8, characterized in that, Includes the following steps: A. External current is output to the conductive layer of the electrode sheet. The conductive layer is heated to the point where the temperature-sensitive solvent liquefies. The solute particles absorb the temperature-sensitive solvent and expand. The solute particles disperse and apply pressure to the non-woven fabric. B. When the external current input is stopped, the temperature of the conductive layer drops to room temperature, the solute particles solidify and set, and fix the attachment surface. C. Replace the electrode connection components, apply sound stimulation, and receive the induced electrophysiological signals through the electrode pads.

10. A method of using an electrode pad for auditory evoked potential detection according to claim 9, characterized in that: After the auditory stimulation test, the non-woven fabric and physiotherapy gel block are removed, the electrode pads are cleaned, a new physiotherapy gel block is inserted, and then covered with non-woven fabric.

Images