Multifunctional electrode device for electroencephalogram signal acquisition and stimulation

Abstract

The utility model relates to a multifunctional electrode device for electroencephalogram signal acquisition and stimulation, which comprises a bottom shell of which the bottom is used for being fixed on a mounting hole of an electroencephalogram cap, and a cover body which is arranged at the top end of the bottom shell in a penetrating manner, the first electrode is embedded in the bottom surface of the cover body, and the first electrode penetrates through the bottom shell along with the cover body and is arranged in the bottom shell; the wire is connected to the cover body, and the two ends of the wire are electrically connected with the first electrode and external electroencephalogram equipment respectively; the second electrode is arranged at the inner bottom end of the cover body, the second electrode is suitable for penetrating out of the bottom end of the bottom shell, and the second electrode is used for making contact with the scalp of the user. By means of the separated design of the bottom shell, the second electrode, the first electrode and the cover body, the first electrode and the second electrode for collection and stimulation can be replaced without detaching the bottom shell from the electroencephalogram cap during use, stimulation after collection is facilitated, operation is convenient and fast, the operation efficiency is greatly improved, and discomfort of a user is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electroencephalogram signal acquisition and stimulation, and particularly relates to a multifunctional electrode device for electroencephalogram signal acquisition and stimulation. BACKGROUND

[0002] Brain-computer interface, sometimes also called "brain port" or "brain-machine fusion perception", is a direct connection path between the brain (or brain cell culture) of a human or animal and an external device. As a multi-disciplinary technology, the brain-computer interface has attracted extensive attention from the scientific research and industrial communities all over the world.

[0003] In the related art, the electroencephalogram signal acquisition and stimulation device is usually of a separate structure, and the acquisition electrode and the stimulation electrode need to be operated separately, so that it is difficult to synchronously perform the signal acquisition and stimulation functions on the same device. That is, after the electroencephalogram signal is acquired, the acquisition electrode needs to be detached from the electroencephalogram cap, and then the stimulation electrode is arranged on the electroencephalogram cap.

[0004] However, in the case of needing different devices to perform the signal acquisition and electrical stimulation operations respectively, since the acquisition electrode needs to be replaced by the stimulation electrode, the operation of rearranging the electrodes is tedious, slow in efficiency, and affects the user experience. CONTENT OF THE UTILITY MODEL

[0005] Embodiments of the present application provide a multifunctional electrode device for electroencephalogram signal acquisition and stimulation, to solve the technical problem that in the related art, the acquisition and stimulation of the electroencephalogram signal are relatively independent, and when the electroencephalogram signal is acquired and then stimulated, the operation of replacing the electrode is tedious, low in efficiency, and affects the user experience.

[0006] A multifunctional electrode device for electroencephalogram signal acquisition and stimulation comprises:

[0007] A bottom shell, which is in a cylindrical shape, has a bottom for being fixed on a mounting hole of an electroencephalogram cap, and has a bottom surface adhering to the scalp of a user;

[0008] A cover, which is arranged at the top end of the bottom shell;

[0009] A first electrode, which is embedded in the bottom surface of the cover and is placed in the bottom shell when the cover is arranged in the bottom shell;

[0010] A wire, which is connected to the cover, has one end electrically connected to the first electrode, and has the other end for being electrically connected to an external electroencephalogram device;

[0011] A second electrode, which is placed at the inner bottom end of the cover and is adapted to pass out of the bottom end of the bottom shell, and is used for contacting the scalp of the user; wherein,

[0012] The first electrode is arranged in the bottom shell as the cover is arranged in the bottom shell, and the first electrode is electrically connected with the second electrode to enable the external brain electricity device to act on the user's scalp.

[0013] In some embodiments, the first electrode and the cover are integrally arranged.

[0014] In some embodiments, the cover comprises:

[0015] A main body part adapted to be arranged in the bottom shell, and a circumferential side surface of the main body part is fitted with a circumferential inner surface of the bottom shell;

[0016] A limiting part fixed to the circumferential side surface of the main body part, and a limiting groove is arranged on the top end surface of the bottom shell; wherein,

[0017] As the main body part is inserted into the bottom shell, the limiting part is inserted into the limiting groove.

[0018] In some embodiments, part of the lead is fixed on the limiting part.

[0019] In some embodiments, an adjusting hole is arranged on the cover, the first electrode is annular, the adjusting hole is in communication with the inner ring of the first electrode, and external saline is adapted to pass through the adjusting hole and the first electrode to reach the second electrode.

[0020] In some embodiments, the bottom shell comprises a first connecting barrel and a second connecting barrel, the first connecting barrel and the second connecting barrel are integrally arranged and in communication, the cover is arranged in the first connecting barrel, the second electrode is detachably connected in the second connecting barrel, and the second electrode is adapted to pass out from the bottom end of the second connecting barrel.

[0021] In some embodiments, the bottom shell further comprises a fixing ring, a circumferential outer surface of the fixing ring is fixed to a circumferential inner surface of the second connecting barrel, the second electrode is arranged in the fixing ring, and the fixing ring is clamped on the second electrode.

[0022] In some embodiments, a gap is left between part of the inner wall of the bottom shell and the second electrode to form a containing space.

[0023] In some embodiments, the bottom of the bottom shell is outwardly expanded.

[0024] In some embodiments, the first electrode comprises a silver / silver chloride sintered electrode, and the second electrode comprises a flexible saline electrode.

[0025] The technical scheme provided by the present application has the beneficial effects of:

[0026] The embodiment of the present application provides a multifunctional electrode device for electroencephalogram signal collection and stimulation. When collecting the electroencephalogram signal, the second electrode is fixed at the inner bottom end of the bottom shell, and the bottom shell is fixed in the mounting hole of the electroencephalogram cap. Part of the bottom shell is located outside the electroencephalogram cap, and part of the bottom shell is located inside the electroencephalogram cap. The bottom end surface of the bottom shell is attached to the scalp of the user, and the second electrode is also attached to the scalp of the user. Then the cap is worn on the head of the user. Subsequently, the cap is arranged on the top end of the bottom shell, the first electrode is arranged in the bottom shell along with the cap, and the first electrode is electrically connected with the second electrode. The lead wire is electrically connected with the external electroencephalogram equipment for collecting the electroencephalogram signal. The electroencephalogram equipment for collecting the electroencephalogram signal is electrically connected with the second electrode. The preset point on the scalp of the user is stimulated, and the collection of the electroencephalogram signal is realized. After the collection of the electroencephalogram signal is completed, the cap is removed from the bottom shell, and the first electrode is removed together. Subsequently, the first electrode is arranged in the electroencephalogram cap, and the second electrode is removed from the bottom end of the bottom shell. Then the second electrode for stimulation is sent into the bottom shell from the top of the bottom shell, and the electroencephalogram cap is reset. The second electrode for stimulation is in contact with the scalp. Subsequently, the cap for stimulation and the first electrode are arranged on the top end of the bottom shell. The first electrode for stimulation is electrically connected with the second electrode for stimulation, and the lead wire is electrically connected with the external electroencephalogram equipment for stimulation. At this time, the external electroencephalogram equipment for stimulation is electrically connected with the second electrode for stimulation, so that the electroencephalogram stimulation is realized.

[0027] The electroencephalogram stimulation and the stimulation are integrated. When the collection and the stimulation are switched, the bottom shell does not need to be removed from the electroencephalogram cap. The second electrode and the first electrode can be conveniently replaced. The operation is convenient. The operation efficiency is greatly improved, and the discomfort of the user is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0029] Figure 1 A schematic diagram of the multifunctional electrode device for electroencephalogram signal collection and stimulation provided by the embodiment of the present application is provided.

[0030] Figure 2 An exploded view of the multifunctional electrode device for electroencephalogram signal collection and stimulation provided by the embodiment of the present application is provided.

[0031] Figure 3 A schematic diagram of the cap and the first electrode provided by the embodiment of the present application is provided.

[0032] Figure 4 An internal schematic diagram of the bottom shell provided by the embodiment of the present application is provided.

[0033] In the figure: 1, bottom shell; 11, first connecting barrel; 12, second connecting barrel; 13, fixing ring; 1a, limiting groove; 2, cover body; 21, main body part; 22, limiting part; 2a, adjusting hole; 3, first electrode; 4, wire; 5, second electrode; a, containing space. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0035] The embodiments of the present application provide a multifunctional electrode device for electroencephalogram signal collection and stimulation, which utilizes the separated design of the bottom shell, the second electrode, the first electrode, and the cover body, so that the first electrode and the second electrode for collection and stimulation can be replaced without being detached from the electroencephalogram cap during use, the stimulation after collection is facilitated, the operation is convenient, the operation efficiency is greatly improved, and the discomfort of the user is reduced. The present application solves the technical problem in the related art that the collection and stimulation of the electroencephalogram signal are relatively independent, the operation of replacing the electrode is cumbersome when the electroencephalogram signal is collected and then stimulated, the efficiency is relatively low, and the user experience is affected.

[0036] REFERENCE Figure 1 and Figure 2 A multifunctional electrode device for electroencephalogram signal collection and stimulation, comprising a bottom shell 1, a cover body 2, a first electrode 3, a second electrode 5, and a wire 4. The second electrode 5 is installed at the inner bottom end of the bottom shell 1, the bottom shell 1 is installed to the electroencephalogram cap, the bottom surface of the bottom shell 1 and the second electrode 5 are in contact with the scalp of the user after the user wears the electroencephalogram cap, and the second electrode 5 can be taken out from the bottom end of the bottom shell 1. The first electrode 3 is extended into the bottom shell 1 along with the cover body 2 penetrating the top end of the bottom shell 1, and is electrically connected with the second electrode 5, and the first electrode 3 is electrically connected with the external electroencephalogram equipment through the wire 4, so that the external electroencephalogram equipment is electrically connected with the second electrode 5, the collection and stimulation of the electroencephalogram are realized, the first electrode 3 and the second electrode 5 do not need to be replaced after the bottom shell 1 is detached from the electroencephalogram cap, the collection and stimulation work are facilitated, the operation efficiency is improved, and the user experience is improved.

[0037] REFERENCE Figure 1 and Figure 2The bottom shell 1 is in a cylindrical shape, and the bottom of the bottom shell 1 is used for fixing on the mounting hole of the electroencephalogram cap. The bottom shell 1 is clamped and fixed with the electroencephalogram cap by being penetrated in the electroencephalogram cap. The part of the fixed bottom shell 1 is located outside the electroencephalogram cap, and the part is located inside the electroencephalogram cap. When the user wears the electroencephalogram cap, the bottom end surface of the bottom shell 1 is attached to the scalp of the user.

[0038] Referring to Figure 1 and Figure 2 The cover 2 is penetrated in the top end of the bottom shell 1. Specifically, the circumferential outer side surface of the cover 2 is attached to the circumferential inner side surface of the top end of the bottom shell 1 to realize the connection of the cover 2 and the bottom shell 1. In the embodiment, the cover 2 is formed by injection molding.

[0039] Referring to Figures 1-3 The first electrode 3 is embedded in the bottom surface of the cover 2, and the first electrode 3 is located in the bottom shell 1 when the cover 2 is penetrated in the bottom shell 1. The first electrode 3 includes a silver / silver chloride sintered electrode. The first electrode 3 is a silver / silver chloride sintered electrode when the electroencephalogram signal is collected or stimulated.

[0040] Referring to Figures 1-3 The wire 4 is penetrated in the cover 2, and one end of the wire 4 is electrically connected with the first electrode 3. The other end of the wire 4 is used for electrically connecting with the external electroencephalogram equipment.

[0041] Referring to Figures 1-3 In the embodiment, the cover 2, the first electrode 3 and the wire 4 are integrally arranged. The external electroencephalogram equipment includes an electroencephalogram collection equipment and an electroencephalogram stimulation equipment. One set of cover 2, first electrode 3 and wire 4 is connected with the electroencephalogram collection equipment, and one set of cover 2, first electrode 3 and wire 4 is connected with the electroencephalogram stimulation equipment. Therefore, when the collection and stimulation operations are switched, the cover 2, the first electrode 3 and the wire 4 are conveniently replaced together, and the connection with the external electroencephalogram equipment is also facilitated. The operation efficiency is improved.

[0042] Referring to Figures 1-3 Specifically, the cover 2 includes a main body part 21 and a limiting part 22. The main body part 21 is adapted to be penetrated in the top end of the bottom shell 1. The main body part 21 is in a rotary body shape, and the circumferential outer side surface of the main body part 21 is attached to the inner side surface of the bottom shell 1. The limiting part 22 is fixed on the circumferential side surface of the main body part 21. The top end surface of the bottom shell 1 is provided with a limiting groove 1a. When the main body part 21 is inserted into the bottom shell 1, the limiting part 22 is inserted into the limiting groove 1a.

[0043] In this way, the limiting groove 1a and the limiting part 22 are arranged, which facilitates the positioning of the connection position of the cover 2 and the bottom shell 1. Since the limiting part 22 is not penetrated into the bottom shell 1, the limiting part 22 can be used as a force point, and the whole cover 2 is conveniently taken out by operating the limiting part 22. In addition, the limiting part 22 is supported by the groove bottom of the limiting groove 1a, which limits the length of the cover 2 extending into the bottom shell 1, and plays a positioning role.

[0044] With reference to Figures 1-3 Further, the part of the wire 4 is adhered to the bottom surface of the limiting part 22, and the arrangement of the limiting part 22 also facilitates the wire 4 to be led out of the cover 2 and to be routed.

[0045] With reference to Figures 1-3 Optionally, the cover 2 is provided with an adjusting hole 2a, and the first electrode 3 is annular, the adjusting hole 2a is in communication with the inner ring of the first electrode 3, and the external salt water is adapted to pass through the adjusting hole 2a and the first electrode 3 to reach the second electrode 5.

[0046] In this way, by arranging the annular first electrode 3 and providing the adjusting hole 2a on the cover 2, it is convenient to inject the salt water to the second electrode 5 to adjust the impedance, so as to meet the impedance requirement for collection or stimulation and improve the operation accuracy.

[0047] With reference to Figures 1-3 In this embodiment, during the collection operation, the second electrode 5 comprises a flexible salt water electrode which is a sponge material; and during the stimulation operation, the second electrode 5 comprises a conductive paste. The flexible salt water electrode is used for absorbing and retaining the salt water and supporting efficient conduction of the signal.

[0048] In this way, during the collection operation, the second electrode 5 is installed into the bottom shell 1 and then the bottom shell 1 is fixed on the EEG cap, or the bottom shell 1 is fixed on the EEG cap first, then the second electrode 5 is installed into the bottom shell 1, and finally the EEG cap is worn on the user's head. Then the first electrode 3 and the cover 2 for collection are installed, so that the EEG collection device is electrically connected with the second electrode 5 for collection, to realize the collection operation. After the collection is completed, the cover 2 and the first electrode 3 for collection are removed from the top end of the cover 2 during the stimulation. Since the EEG cap is elastic, the second electrode 5 can be extended into the EEG cap and taken out from the bottom end of the bottom shell 1 without the need to remove the bottom shell 1 from the EEG cap. Then the second electrode 5 for stimulation is injected into the bottom shell 1, and the cover 2 and the first electrode 3 for stimulation are installed, so that the EEG stimulation device is electrically connected with the second electrode 5 for stimulation, to realize the stimulation operation. Therefore, when the collection and stimulation operations are switched, the first electrode 3 and the second electrode 5 are conveniently replaced, the operation efficiency is improved, and the user experience is improved.

[0049] With reference to Figures 1-4, specifically, the bottom shell 1 comprises a first connecting cylinder 11 and a second connecting cylinder 12, which are integrally formed and communicated. The cover 2 is arranged in the first connecting cylinder 11, and the second electrode 5 is detachably connected in the second connecting cylinder 12 and is adapted to pass through the bottom end of the second connecting cylinder 12 to pass out of the bottom shell 1. In the embodiment, the first connecting cylinder 11 and the second connecting cylinder 12 are integrally formed, and the bottom shell 1 is not assembled by two components.

[0050] With reference to Figures 1-4 , specifically, the bottom shell 1 further comprises a fixing ring 13, the circumferential outer side of the fixing ring 13 is fixed to the circumferential inner side of the second connecting cylinder 12, and in the embodiment, the fixing ring 13 is integrally formed with the second connecting cylinder 12. The second electrode 5 is arranged in the fixing ring 13, and the fixing ring 13 is clamped on the second electrode 5.

[0051] With reference to Figures 1-4 , when the second electrode 5 is installed, the second electrode 5 is arranged in the fixing ring 13, and at this time, the circumferential outer side of the second electrode 5 is in contact with the circumferential inner side of the fixing ring 13, so as to clamp the second electrode 5 by the fixing ring 13 and limit the movement of the second electrode 5. The connection stability of the second electrode 5 with the scalp of the user and the first electrode 3 is ensured when collecting the brain electrical signal.

[0052] With reference to Figures 1-4 , further, a gap is left between part of the inner wall of the bottom shell 1 and the second electrode 5 to form a containing space a. In the embodiment, a gap is left between the second electrode 5 and the inner wall of the second connecting cylinder 12 to form the containing space a.

[0053] The containing space a is arranged to store excess saline solution and prevent the saline solution from leaking out to cause short circuit.

[0054] Further, the bottom of the bottom shell 1 is outwardly expanded. Preferably, the bottom of the bottom shell 1 is in the shape of a trumpet mouth, and the surface has wrinkles to increase the bottom surface area of the bottom shell 1.

[0055] In this way, by the shape design of the bottom shell 1, the bottom surface area of the bottom shell 1 is increased, the contact area of the bottom shell 1 with the scalp is increased, and the use comfort is improved.

[0056] In the embodiment, the material of the bottom shell 1 comprises silica gel to reduce the discomfort after the bottom shell 1 contacts the user.

[0057] The embodiment of the application provides a multifunctional electrode device for electroencephalogram signal acquisition and stimulation.

[0058] After the electroencephalogram signal acquisition is completed, the cover 2 is removed from the bottom shell 1, and the first electrode 3 is removed together, then the second electrode 5 is taken out from the bottom end of the bottom shell 1 by being stretched into the electroencephalogram cap, and the second electrode 5 for stimulation is sent into the bottom shell 1 from the top end of the bottom shell 1, so that the electroencephalogram cap is reset, the second electrode 5 for stimulation is in contact with the scalp, then the cover 2 for stimulation and the first electrode 3 are arranged on the top end of the bottom shell 1, so that the first electrode 3 for stimulation is electrically connected with the second electrode 5 for stimulation, and the lead wire 4 is electrically connected with the external electroencephalogram equipment for stimulation, at this time, the external electroencephalogram equipment for stimulation is electrically connected with the second electrode 5 for stimulation, so as to realize electroencephalogram stimulation.

[0059] Therefore, the electroencephalogram stimulation and the stimulation are integrated, when the acquisition and the stimulation are switched, the bottom shell 1 does not need to be removed from the electroencephalogram cap, the second electrode 5 and the first electrode 3 can be conveniently replaced, the operation is convenient, the operation efficiency is greatly improved, and the discomfort of the user is reduced.

[0060] In the description of the application, it should be noted that the positions or position relationships indicated by the terms "upper", "lower" and the like are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection, can be mechanical connection, can also be electrical connection, can be direct connection, can also be indirect connection through an intermediate medium, and can be the communication between two elements. For those skilled in the art, the specific meanings of the above terms in the application can be understood according to the specific circumstances.

[0061] It has to be noted that, in the present application, the terms "first", "second", etc. are used only to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0062] The foregoing detailed description has set forth various embodiments of the application via the use of specific terminology. However, embodiments thereof can be implemented with other methods, materials, and components, and accordingly the terms are not intended to limit the scope of the inventive principles described herein. It is to be understood that the above description is intended to be illustrative, and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead with reference to the appended claims, along with their full scope of equivalents.

Claims

1. A multifunctional electrode device for electroencephalographic signal acquisition and stimulation, characterized in that, It comprises: a bottom shell, which is cylindrical, the bottom of the bottom shell is used to be fixed on the mounting hole of an electroencephalogram cap, and the bottom surface of the bottom shell is attached to the user's scalp; a cover, which is arranged on the top end of the bottom shell; a first electrode, which is embedded in the bottom surface of the cover and is arranged in the bottom shell when the cover is arranged in the bottom shell; a lead wire, which is connected to the cover, one end of the lead wire is electrically connected to the first electrode, and the other end of the lead wire is used to be electrically connected to an external electroencephalogram device; a second electrode, which is arranged at the inner bottom end of the cover and is adapted to pass out of the bottom end of the bottom shell, and the second electrode is used to contact the user's scalp; wherein the first electrode is arranged in the bottom shell when the cover is arranged in the bottom shell, and the first electrode is electrically connected to the second electrode, so that the external electroencephalogram device acts on the user's scalp.

2. The multifunctional electrode device for electroencephalogram signal acquisition and stimulation according to claim 1, characterized in that, The first electrode and the cover are integrally formed.

3. The multifunctional electrode device for electroencephalogram signal acquisition and stimulation according to claim 1, characterized in that, The cover comprises: a main body portion, which is adapted to be arranged in the bottom shell, and the circumferential side surface of the main body portion is attached to the circumferential inner side surface of the bottom shell; a limiting portion, which is fixed to the circumferential side surface of the main body portion, and a limiting groove is arranged on the top end surface of the bottom shell; wherein when the main body portion is inserted into the bottom shell, the limiting portion is inserted into the limiting groove.

4. The multifunctional electrode device for electroencephalogram signal acquisition and stimulation according to claim 3, characterized in that, Part of the lead wire is fixed on the limiting portion.

5. The multifunctional electrode device for electroencephalogram acquisition and stimulation according to claim 1, wherein, An adjusting hole is arranged on the cover, the first electrode is annular, the adjusting hole is in communication with the inner ring of the first electrode, and external saline is adapted to pass through the adjusting hole and the first electrode to reach the second electrode.

6. The multifunctional electrode device for electroencephalogram acquisition and stimulation according to claim 1, wherein, The bottom shell comprises a first connecting cylinder and a second connecting cylinder, the first connecting cylinder and the second connecting cylinder are integrally formed and communicated, the cover is arranged in the first connecting cylinder, the second electrode is detachably connected in the second connecting cylinder, and the second electrode is adapted to pass out of the bottom end of the second connecting cylinder.

7. The multifunctional electrode device for electroencephalogram signal acquisition and stimulation according to claim 6, characterized in that, The bottom shell further comprises a fixing ring, the circumferential outer side surface of the fixing ring is fixed to the circumferential inner side surface of the second connecting cylinder, the second electrode is arranged in the fixing ring, and the fixing ring is clamped on the second electrode.

8. The multifunctional electrode device for electroencephalogram acquisition and stimulation according to claim 1, wherein, There is a gap between part of the inner wall of the bottom shell and the second electrode to form an accommodation space.

9. The multifunctional electrode device for electroencephalogram acquisition and stimulation according to claim 1, wherein, The bottom of the bottom shell is outwardly expanded.

10. The multifunctional electrode device for electroencephalogram acquisition and stimulation according to claim 1, wherein, The first electrode comprises a silver / silver chloride sintered electrode, and the second electrode comprises a flexible saline electrode.

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