JP2002291712A - Biological bipolar electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological bipolar electrode allowing increase of an conductive area, capable of stably supplying an electrical stimulation, suppressing deterioration in electrode terminal parts, and allowing stable sticking or the like to an organism. SOLUTION: This biological bipolar electrode has a non-conductive base material sheet; an electrode element layer laminated on the base material sheet and divided in two by an insulation part positioning in a center part; the two terminal parts forming a pair at a prescribed interval through the insulation part, disposed by caulking such that sandwiching by snap terminals and metal fixing tools is generated; an insulation layer stuck to the center part such that the insulation layer covers at least the whole surface on the flange side of each the terminal part metal fixing tool; and a conductive adhesive layer laminated on a part on the end side of the insulation layer and an electrode element layer part which is not stuck with the insulation layer, and not laminated on insulation layer parts where the metal fixing tools are positioned. In the biological bipolar electrode, two electrodes are integrally formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological electrode.
More specifically, the present invention relates to a bipolar bioelectrode for a therapeutic device or a slimming body used for supplying a pulse current of a low-frequency and a medium-frequency oscillator.

[0002]

2. Description of the Related Art Conductive rubber pads and conductive polymer gels have been generally used for biological electrodes. recently,
A method using a conductive rubber pad has hardly been seen, and a method has been adopted in which a plurality of electrodes made of an adhesive conductive polymer gel are directly attached to the skin or the affected area of the skin for use. For example, in Japanese Utility Model Laid-Open No. 5-70552,
A device relating to a biomedical electrode having a plurality of electrodes having the configuration shown in FIG. 8 is disclosed. That is, it is composed of a conductive pressure-sensitive adhesive 100, an electronic conductive layer 200, a non-conductive sheet 300, and an external connection means 400, and the snap in the figure is attached and fixed by a tape 500. With this configuration, it is described that each electrode has a terminal protruding above the sheet-like material as a means for connection to the outside, and that since it is integrated, it has good adhesion and followability to the skin. ing. In this invention, the flange portion of the electrode terminal is fixed by a tape in the conductive adhesive layer, and a part of the electronic conductive layer has a structure in contact with the outside air.

Japanese Patent Application Laid-Open No. 7-328129 discloses a configuration in which a non-adhesive layer is provided on the lower surface of a terminal portion and a conductive adhesive layer is provided on the entire lower surface except for the terminal portion. Here, the relationship between the terminal portion and the conductive pressure-sensitive adhesive layer is a configuration of a unipolar electrode. That is, a convex terminal that is in contact with the conductive layer is attached to the base sheet provided with the conductive layer, a non-adhesive layer is provided on the lower surface of the terminal attachment portion of the base sheet, and the entire lower surface excluding the terminal attachment portion is electrically conductive. An adhesive layer is provided. It is described that the non-adhesive layer and the conductive adhesive layer are configured to be non-linear at the boundary between them, and are easy to peel off from the human body.

[0004] Conventionally, there has been proposed a method in which the metal terminal is not brought into direct contact with the conductive pressure-sensitive adhesive layer so that the metal terminal does not come into direct contact with the conductive pressure-sensitive adhesive layer to corrode or cause poor contact. However, there is a drawback that the strength is not sufficient in terms of the area of adhesion between the synthetic resin film or the non-adhesive layer and the conductive adhesive layer interposed so as to be in contact with the metal terminal and the compatibility or compatibility.

[0005]

In general, the range of electrical stimulation by a living body electrode can be set widely, that is, the control of the resistance range mainly depends on the conduction area of the electrode. For this purpose, a configuration in which a wider electrode area can be obtained even with the same electrode shape is preferable. In addition, if the electrode can be adjusted moderately and the electrode has an appropriately large area, it can be said that the electrode is gentle on the skin because the electric stimulation given to the human body can be dispersed over the entire area.

Conventional bipolar electrodes, for example, Japanese Utility Model Laid-Open No. 5-70
In the structure according to the invention of Japanese Patent No. 552, the distance between terminals is wide,
If this distance is reduced to increase the conductive area, the distance between the conductive pressure-sensitive adhesive layers also decreases, and the soft conductive pressure-sensitive adhesive layers stick to each other due to pressing force, and there is the danger of short-circuiting between terminals. There is. In addition, when a compact electrode is designed to cope with the miniaturization of the main body device, the conductive area of the electrode is reduced, and the range of the electrical stimulation control for an electrode of, for example, a low-frequency therapeutic device is reduced.

Next, according to the electrode described in Japanese Patent Application Laid-Open No. 7-328129, it is difficult to process the non-adhesive layer provided on the lower surface of the terminal portion and the conductive adhesive layer, and it is difficult to process both. Since the contact is an end face, the bonding location is limited to only the boundary face. If such a terminal portion is kept largely bent upward, or if sticking and peeling are repeated, the bonded portion on the end face is exposed to the outside air, and the electrode element portion is easily oxidized and sulfurized. Even if a metal of a type that is not affected by the outside air is used, if the above-mentioned state is maintained or repeated, the electrode is easily damaged, and physical electrode deterioration tends to occur.

Further, according to this patent publication, the material used for the non-adhesive layer is a soft synthetic resin foam, a soft synthetic resin film, a nonwoven fabric, a woven fabric, or a laminate thereof from the viewpoint of electrical insulation and appearance. Have been chosen. However, there are many disadvantages in contact with the conductive pressure-sensitive adhesive layer in terms of substantial bonding area, cost, and the like, and there is no mention of the degree of peel strength. As described above, the influence of the peel strength between the non-adhesive layer and the conductive adhesive layer has a problem of metal transformation such as oxidation and sulfidation of the electrode element portion and a problem of being easily damaged by physical damage. Further, the rigidity of the non-conductive layer is higher than that of the conductive pressure-sensitive adhesive layer, so that stress is likely to concentrate on the boundary between the two because of lack of partial flexibility.

An object of the present invention is to solve these conventional problems. That is, it is possible to set an electrical stimulus in a wider range, and it is excellent in sticking property, the conductive adhesive layer and the insulating layer are hardly peeled off, and the terminals and electrode elements are oxidized or sulfurized or physically damaged. It is an object of the present invention to provide a bipolar electrode for a living body which can prevent the occurrence of such problems.

[0010]

Means for Solving the Problems The present inventors have made intensive studies to solve these conventional problems, and as a result, have completed the present invention and include the following inventions. 1) a non-conductive base sheet, an electrode element layer laminated on the base sheet and divided into two parts by an insulating part located at the center, and a pair formed at regular intervals via the insulating part; And two terminal portions which are crimped so as to be sandwiched between the metal fixing device and the metal fixing device, an insulating layer attached to a central portion so as to cover at least the entire flange side of the terminal portion metal fixing device, and A part of the end side and a conductive pressure-sensitive adhesive layer that is laminated on the electrode element layer part where the insulating layer is not attached, but is not laminated on the insulating layer part where the metal fixture is located, are provided. And a bipolar electrode for a living body, wherein the bipolar electrode is formed integrally.

2) The bipolar electrode for a living body according to the above 1), wherein the insulating layer has a peel strength from the conductive pressure-sensitive adhesive layer of 2.9 N / 20 mm or more. 3) In the base sheet, the area ratio (A / B) of the conductive paste printed portion (A) and the conductive pressure-sensitive adhesive layer (B) constituting the electrode element portion is 1.09 to 2.05. The bipolar electrode for living body according to the above 1) or 2), characterized in that:
In the biological bipolar electrode of the present invention, as described above,
An electrode element layer and an electrode terminal portion are independently disposed on both sides on one non-conductive base sheet, and the flange side of the terminal portion metal fixing member is insulated in the terminal arrangement direction (for example, insulating tape or insulating tape). Conductive adhesive layers are provided on both sides so as to overlap at regular intervals on the ends of the coated insulating layer, and the electrode element part is completely shut off from the outside air. ing.

In the case of a conventional bipolar type for a living body, at least a part of the electrode element portion made of a conductive paste is in contact with the outside air, and oxidation or sulfidation can be avoided depending on the type of metal used as the conductive material. Absent. In particular, when silver or silver / silver chloride having high versatility is used for the electrode element portion, it is easily oxidized. In addition, if the coating film of the conductive paste is exposed in a normally used environment, the conductive paste may come into contact with the skin and may be susceptible to external damage such as a scratch. According to the configuration of the present invention, these problems are solved.

In the present invention, a conductive pressure-sensitive adhesive layer having a smaller area than that of the electrode element layer is laminated on the electrode element layer, and an insulating layer is provided between the two conductive pressure-sensitive adhesive layers. An interval equal to or larger than the diameter of the flange portion of the metal fitting is taken. That is, the terminal portion is completely isolated from the conductive pressure-sensitive adhesive layer, and there is no possibility that both conductive pressure-sensitive adhesive layers stick to each other. For this reason, the limit of the distance separating the terminal polarities depends only on the printing accuracy. Since the current pattern printing technology is capable of fine printing accuracy, it is possible to take a substantial area of the electrode element part wider than in the past and reduce the resistance when combined with the configuration of the present invention. . Therefore, it is possible to adjust the electrical stimulation in a wide range.

According to the present invention, the lower surface of the terminal metal fixture is covered with the insulating layer, and the conductive adhesive layer does not exist except for a part of the insulating layer at the end side. Thereby, the electrode terminals and the electrode element portion are protected. In contrast, conventionally, the terminal metal fixture is in the conductive adhesive layer and does not contact the insulating layer, preventing the conductive substance from penetrating from the conductive adhesive and preventing corrosion due to salt and moisture. Then, the degree of electrical stimulation directly below the terminal is reduced. The present invention achieves prevention and protection of deterioration of the electrode element portion based on the concept completely different from the conventional one.

Therefore, in the present invention, it is preferable that the insulating layer is made of a material which suppresses peeling of the conductive pressure-sensitive adhesive layer at the contact with the conductive pressure-sensitive adhesive layer, has no water permeability, and has a large surface area. That is, as described above, the peel strength of the conductive pressure-sensitive adhesive layer is preferably 2.9 N / 20 mm or more. Although the upper limit of the peel strength is not particularly limited, it is usually sufficient to be about 30 N / 20 mm. The width of the conductive pressure-sensitive adhesive layer coated on the end side of the insulating layer (d, d ′ in FIGS. 2 and 3 later) is 0.5 to 10 m.
m is preferable. On the other hand, as described above, the printed area of the entire conductive paste and the area ratio of the conductive pressure-sensitive adhesive layer laminated thereon are different from the conductive paste printed portion (A) constituting the electrode element portion with the conductive pressure-sensitive adhesive layer. The area ratio (A / B) of the agent layer (B) is preferably from 1.09 to 2.05.

In the bipolar electrode for a living body of the present invention, two terminal portions are integrated to constitute an electrode. However, since the terminal interval is set to be constant at a predetermined interval, two conductive adhesives are used. The agent layer is kept at a fixed distance, does not stick, and is easy to handle. Further, since the conductive area is widely secured by the limited area of the electrode, it is possible to obtain electrical stimulation corresponding to the specifications of various devices. Furthermore, since the conductive adhesive layer and the insulating tape covering the terminal portion are overlapped at a predetermined interval, it is difficult to peel off, and the terminal portion and the electrode element portion do not come into contact with the outside air, and oxidation or sulfuration of the electrode element portion, or Deterioration such as physical damage can be completely prevented. As a result, the electrical stimulation of the electrodes is stable and the same behavior can always be reproduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a specific example of a biological bipolar electrode of the present invention will be described with reference to the drawings. FIG.
It is a top view which shows an example of the bipolar electrode 1 for living bodies of this invention, and two electrode terminals 3, 3 'are arrange | positioned at regular intervals at a center part, and perpendicular | vertical to a longitudinal direction. In this example, an elliptical punched portion 2 is provided at a substantially intermediate portion between the two electrode terminals.
Is provided, which has a function of facilitating the fitting operation when connecting to the conductor-side terminal.

FIG. 2 is a bottom view. In the figure, there are two independent electrode element layers 5, 5 'represented by a mesh pattern, on which conductive adhesive layers 6, 6' made of a transparent adhesive gel containing an electrolyte are respectively laminated. I have. An electrical insulating layer 11 is attached to a central portion including the electrode terminal portions, and both sides are electrically independent. The conductive pressure-sensitive adhesive layers 6 and 6 ′ are laminated so as to partially (d, d ′) overlap at the edge of the insulating layer.

FIG. 3A is a side view as viewed from the longitudinal direction, and FIG. 3B is an enlarged view centering on the electrode terminal portion. As shown in this figure, the non-conductive base sheet 4
, An electrode element layer 5 and a conductive adhesive layer 6 are laminated,
Electrode terminal part 3 consisting of snap terminal 9 and metal fixture 10
Is attached. Here, the electric insulating layer 11 traverses the fixture 10 and both ends thereof are attached to the conductive element layer. The conductive pressure-sensitive adhesive layer is stacked on the electrode element portion while overlapping the edge (d) of the insulating layer. The electrode terminal portion 3 is composed of a snap terminal 9 and a terminal portion connected by caulking so as to be sandwiched by a metal fixing device 10. As described above, the flange side of the terminal portion metal fixing device is changed from one end to the other end. The insulating layer 11 attached with a constant width is attached so as to cross up to the width. The electrical insulating layer 11 prevents the electrical stimulus from being directly transmitted from the terminal portion to the human body, and makes the electrical stimulus uniform.
It has the function of protecting the metal fixture from conductive substances.

In the example of FIG. 3, a peelable protective film 7 is laminated on the conductive pressure-sensitive adhesive layer 6, but this protective film is peeled off when it is attached to a human body. In addition, the conductive adhesive layer may be provided with an intermediate substrate 6 at an intermediate portion thereof. FIG. 4 is a cross-sectional view taken along the line CC, that is, a cross-sectional view as viewed from the electrode element layer surface. As shown in this figure,
Electrode element layers 5 and 5 ′ are independently provided at the center of the base sheet via an S-shaped electric insulating portion 12, and electrode terminals 3 and 3 ′ are attached to each of them. be independent. The electrode element layer is usually formed by printing a conductive paste on a non-conductive sheet, and the two electrode element layers are made of an S-shaped electric insulating portion 12 which is a non-printed portion.
Independent. The electrical insulating portion 12 does not necessarily have to be S-shaped, but in order to make the two electrodes located at the center independent and to increase the conductive area as much as possible,
Advantageously, it is shaped like a letter.

The conductive pressure-sensitive adhesive layer in the biological electrode is a pressure-sensitive adhesive gel containing an electrolyte, and has a function of being applied to a living body and transmitting an electric stimulus. In the present invention, the conductive pressure-sensitive adhesive layer has an area smaller than that of the electrode element layer, and is arranged so as not to extend to the lower side of the electrode terminal portion located at the center and the vicinity thereof. It is. This is as shown in FIGS. 2 and 3 described above.
As a result, the electrode terminal portion is completely separated from the conductive pressure-sensitive adhesive layer, and there is no fear of corrosion and deterioration due to the electrolyte. In addition, the central portion of the pad is thinner by the absence of the conductive adhesive layer, and can be more flexible, so that it can be easily attached to, for example, a bent portion of the human body, and can be used during use. It is effective in preventing peeling off.

One of the disadvantages of the conventional bipolar electrode is that
The non-adhesive layer including the terminal portion surrounded by the conductive adhesive layers on both sides is characterized in that stress is not easily relieved. For example, a load may be applied to the non-adhesive portion at the center of the electrode in a state where the electrode is adhered to the skin, and the electrode may be easily peeled off. However, the configuration of the present invention provides one solution as described above. Hereinafter, each member of the bipolar electrode for living body of the present invention will be described. As the non-conductive substrate sheet, usually, a resin film is used, the material of which is not particularly limited,
A film that does not have a large elasticity and has a relatively high waist strength is preferable so that the distance between the two terminals can be kept constant when affixed to human skin. As such a resin film, for example, polyethylene terephthalate (PE)
It is preferable to use a film having a thickness of 10 to 500 μm, such as T), polyethylene, polyvinyl chloride, or polypropylene. In particular, it is preferable to use a PET film which has high waist strength and is easy to print, or a film in which polyethylene is laminated on the PET film when flexibility is required. In addition, the Japanese Patent Application No. 2000-11799 filed earlier.
7, the wobble of the convex terminal is suppressed as a base material sheet,
A flexible synthetic resin sheet having high flexibility and a thickness of 0.3 mm or more is disclosed. It is one of the important methods to make the connection between the snap terminal and the metal fixture by caulking more secure. This flexible substrate is preferably a foam, and is obtained from a resin substrate containing a homo- or copolymer or a polymer mixture of water-impermeable polyethylene, polypropylene, polyethylvinyl acetate or a partially saponified product thereof. It is preferably a foam sheet.

The electrode element layer is formed using a predetermined conductive material. Such conductive materials include, for example, silver, a mixture of silver-silver chloride, nickel, molybdenum,
Examples of the conductive paste include a metal such as zinc, aluminum, or the like, or carbon black, graphite, or the like, which is used alone or in combination of two or more, and is prepared together with a solvent or a binder. 100Ω / c as conductive paste layer
A resistance material of m ² or less is used for pattern printing by adjusting the film thickness. These can be widely adjusted in resistance depending on the kind of metal and the difference in particle size.

As the conductive pressure-sensitive adhesive layer, any material can be used as long as it has conductivity and has little irritation to the skin and has an adhesive force, and is not particularly limited. Are, for example, polyacrylamide, sodium polyacrylate, polyacrylic acid derivatives such as polyacrylates, polyvinylpyrrolidone, poly-N-vinylamide derivatives such as poly-N-vinylacetamide,
A conductive adhesive gel containing polyurethane or the like as a matrix and containing water, an electrolyte salt or the like can be suitably used.

The insulating layer includes an insulating synthetic resin film, a nonwoven fabric, and a woven fabric. It is impermeable to water and needs to have adhesiveness to the conductive pressure-sensitive adhesive layer, and preferably has no water absorption and no water content. When the synthetic resin film is used as the insulating layer for the purpose of the present invention, it is necessary to have polarity. Further, as a method of increasing the adhesive strength to the conductive pressure-sensitive adhesive layer, a method of making the surface rough by adding a hydrophilic treatment or a filler may be mentioned. In this case, even a non-polar film can be used. That is, since the nonwoven fabric has water permeability to increase the flexibility of the base material,
Those that have been subjected to a water-impermeable treatment are preferred, and the best combination of adhesive strength and flexibility is selected. In the present invention, a non-woven polyethylene nonwoven fabric (trade name: Tyvek) which does not have polarity but is water-impermeable in terms of surface area and water impermeability was preferred. Further, the present invention is not limited to the above film, and may be formed by coating a flexible insulating resin coating film on the surface of the electrode element portion.

Since the snap terminal and the metal fixture do not come into direct contact with the conductive pressure-sensitive adhesive layer in the structure of the present invention, they need only be conductive, durable and resistant to corrosion. However, the diameter of the flange of the metal fixture is preferably 4 to 18 mm in order to make use of the printing accuracy of the conductive paste. If the flange diameter is less than 4 mm, the film may be broken or pulled out due to insufficient strength at the time of caulking, etc., and if it exceeds 18 mm, it may straddle the insulating portion of the conductive paste or may have its own weight. It is not preferable because the conductive pressure-sensitive adhesive layer is easily peeled off.

The area ratio of the entire printed area of the conductive paste to the area of the conductive pressure-sensitive adhesive layer overlapping the printed area is 1.09.
It is preferable to set it in the range of -2.05. That is,
When the area ratio is less than 1.09, the interval between the non-conductive portions becomes extremely small, which is the limit of printing accuracy, and at the same time, there is a portion where the conductive pressure-sensitive adhesive layers are short-circuited due to sticking by pressing pressure or the like. It is not preferable because it may occur. On the other hand, if the area ratio exceeds 2.05, the area occupied by the conductive pressure-sensitive adhesive layer becomes small, and the electric current value to the skin is concentrated on a small area.

Next, a method for producing the bipolar electrode for living body of the present invention will be described. As shown in the figure, the conductive paste is applied to the non-conductive base material sheet from one side end to the other side in the direction in which the terminals are arranged so that the central part of the electrode is alternately formed in the non-conductive base sheet. A printing section is formed. Further, a predetermined interval is provided in the electrode element layer, and the terminal is constituted by being sandwiched between the snap terminal and the metal fixture from above and below. The diameter of the snap terminal and the metal fixture is 4 to 18 mm. The terminal is disposed in one direction from the one end to the other end with an insulating tape, and the end of the insulating tape is 0.5 to 10 mm in width (see FIG. At a width d) in 2 and 3, the conductive adhesive layer is overlaid and adhered. When the width is less than 0.5 mm, there is substantially no sticking accuracy, the electrode element layer is easily exposed, and the conductive adhesive layer and the insulating tape are likely to peel off due to bending or the like, which is not preferable. Also, 10mm
Exceeding the range is not preferable because the range in which the electrical stimulation can be controlled substantially decreases. The conductive pressure-sensitive adhesive layer is stuck on the entire electrode portion except for the above-mentioned interval. If the peel strength between the pressure-sensitive adhesive layer and the insulating film is less than 2.9 N / 20 mm, a portion having a bonding width of 0.5 mm tends to remain on the skin, and the pressure-sensitive adhesive layer is deformed by pulling the edge. Not preferred. There is no particular upper limit.

The width of the insulating tape to be covered in the direction in which the electrode terminal portions are disposed may be any width as long as it can be attached so as to cover the metal fixture of the terminal portions. It is set to about 25 mm. The distance between terminals is 5
If the length is less than 5 mm, the ends of the metal fixture come into contact with each other. Preferably, 2
When the thickness is 0 to 30 mm, the production efficiency and the usability are improved.

Each electrode element is formed integrally by pattern printing. For the pattern printing, for example, screen printing, gravure printing, or the like is suitably adopted, but it is not particularly limited. The electrode element formed by printing has a thickness of 2 to 30 μm, preferably 5 to 15 μm in a dry state after printing. The conductive pressure-sensitive adhesive layer has a thickness of 0.1 to 2.5 mm, preferably 0.2 to 2.5 mm.
A range of 1.5 mm is used. The conductive pressure-sensitive adhesive layer covers the entire surface of the electrode element portion except for the portion covered with the insulating tape to enhance the adhesion between the electrode element portion and the skin.

FIG. 5 shows an example of the shape of the bipolar electrode for living body of the present invention.
7 are shown. In these examples, except for the appearance shape, the shape of the non-conductive base sheet and the conductive paste and the non-printed portion printed thereon, the configuration and arrangement of the terminal portions, the configuration of the insulating tape, etc. are all as described above. . As shown in FIG.
By forming the dent portion in the central portion, the stress of gravity can be reduced by the adhesive layer portion. FIG. 6 shows an example in which a dent portion is provided on one side in the center portion and a turnover is provided on the other side in a shape corresponding to the dent portion, so that the number of productions can be increased. FIG. 7 shows another example of the shape.

[0032]

EXAMPLES Next, specific examples of the peel strength of the adhesive surface between the conductive pressure-sensitive adhesive layer and the insulating synthetic resin film will be shown as examples. Various insulating synthetic resin films and a conductive pressure-sensitive adhesive layer (Technogel manufactured by Sekisui Chemical Co., Ltd.) were adhered and allowed to stand at room temperature for about 1 hour to allow the gel and resin to adapt. Using a sample piece cut out of 20 mm x 120 mm, JIS adhesive tape / adhesive sheet test method Z0237
The peel strength between the insulating synthetic resin film and the conductive pressure-sensitive adhesive layer was measured by the 90-degree peeling method described in -1980.

Further, the conductive pressure-sensitive adhesive layer of the above sample was adhered to a hairless portion on the inner side of a human upper arm, left for 5 minutes, and peeling and destruction of the conductive pressure-sensitive adhesive layer when peeled off were observed. Table 1 shows the synthetic resin films and the measurement results.

[0034]

[Table 1]

From Table 1, it can be seen that the synthetic resin film treated to increase the surface area of the surface in contact with the gel layer, the synthetic resin film treated to increase the adhesion to the conductive adhesive layer, and the structure Polar synthetic resin films and nonwoven fabrics processed with fibers have high peel strength and showed good results in the sticking test. Next, in the combination of Example 3 above, samples having different area ratios were prepared, and a skin sticking test was performed. Table 2 shows the measurement results of the skin sticking test with respect to the area ratio.

[0036]

[Table 2]

From Table 2, it was not confirmed that the pressure-sensitive adhesive layer remained on the skin surface or the pressure-sensitive adhesive layer was broken by the skin sticking test in the area ratio of 1.09 to 2.05. However, in the sample having an area ratio of 2.058, the sticking of the pressure-sensitive adhesive layer was good, but an unpleasant sensation was obtained in actual electrical stimulation. Further, when it is less than 1.05, the accuracy of sticking the conductive pressure-sensitive adhesive layer was required, and the sample could not be substantially produced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a biological bipolar electrode of the present invention.

FIG. 2 is a plan view showing an example of a biological bipolar electrode of the present invention.

FIG. 3 is a side view (a) showing an example of a bipolar electrode for a living body of the present invention, and a partially enlarged view (b) thereof.

FIG. 4 is a sectional view taken along the line CC in FIG. 3;

FIG. 5 shows an example of the shape of a bipolar electrode for a living body.

FIG. 6 shows an example of the shape of a bipolar electrode for a living body.

FIG. 7 shows an example of the shape of a bipolar electrode for a living body.

FIG. 8 shows an example of a conventional biomedical electrode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bipolar electrode for living bodies 2 Punched part 3, 3 'electrode side terminal (snap) 4 Non-conductive base material sheet 5, 5' Electrode element layer 6, 6 'Conductive adhesive layer 7 Protective film 8 Intermediate base material 9 Snap 10 Snap fixing bracket 11 Electrical insulating layer 12 Electrical insulating part

Continuation of the front page (72) Inventor Shuichi Sasahara 3-7-16 Hatada, Oji-machi, Kitatsukatsuragi-gun, Nara Prefecture (72) Inventor Tetsuya Nishi 4-1-15-1516 Nankin-cho, Nara-shi, Nara F-term (reference) 4C053 BB06 BB23 BB34 BB36

Claims (3)

[Claims] 1. A non-conductive base sheet, an electrode element layer laminated on the base sheet and divided into two parts by an insulating part located at a central part, and a pair is formed at regular intervals through the insulating part. Two terminal portions which are crimped so as to be sandwiched between a snap terminal and a metal fixing device, and an insulating layer attached to a central portion so as to cover at least the entire flange side of the terminal portion metal fixing device, and A part of the end side of the insulating layer and a conductive adhesive layer that is laminated on the electrode element layer part where the insulating layer is not attached but is not laminated on the insulating layer part where the metal fixture is located. A bipolar electrode for a living body, comprising: a bipolar electrode; 2. The bipolar electrode according to claim 1, wherein the insulating layer has a peel strength of 2.9 N / 20 mm or more with respect to the conductive pressure-sensitive adhesive layer. 3. The base sheet has an area ratio (A / B) of a conductive paste printed portion (A) and a conductive pressure-sensitive adhesive layer (B) constituting an electrode element portion of 1.09 to 2.05. The bipolar electrode for living body according to claim 1 or 2, wherein: