JPH04231072A - Pad for bioelectrode - Google Patents

Abstract

PURPOSE:To improve electric conductivity, workability and fixing property to a bioelectrode by providing a sheet-like frame material on the peripheral edge part of a fabric base material and forming a water-contg. gel layer on the surface of the fabric base material on the side being brought into contact with an organism and a pressure-sensitive adhesive layer for fixing on the bioelectrode on the opposite face of the peripheral edge part of the base material. CONSTITUTION:A sheet-like frame material 2 is provided on the peripheral edge part of a fabric base material 3 to provide shape retention to a pad and to improve workability. In addition, a water-contg. gel layer 1 is provided on one side of the fabric base material 3 and is communicated to the back surface through the fabric base material 3. A pressure- sensitive adhesive layer 4 is formed at a position corresponding to the frame material 2- forming part on the back surface side of the base material 3 and is adhered and fixed on a bioelectrode. In addition, it is pref. that exposed faces are covered with a separator 5 in such a way that the surfaces of the water-contg. gel layer 1 and the pressure-sensitive adhesive layer 4 are not contaminated when it is stored. In addition, it may be possible that the frame material is formed not only on one face but on both faces of the fabric base material 3 and the pressure-sensitive adhesive layer 4 is formed on the frame material on the back surface side.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad for a bioelectrode, and more particularly to a pad for a bioelectrode that has good fixability to a bioelectrode and is easy to operate.

0002

[Prior Art] Conventionally, there have been devices that promote blood flow by introducing electrical signals such as low-frequency weak currents and high-frequency electromagnetic waves into the body from outside the body, and perform treatment mainly with a massage effect. Bioelectrode pads are used in devices such as electrocardiographs, electroencephalograms, and electromyographs that extract and measure electrical signals from the body. Such pads require electrical conductivity, and in recent years, pads using hydrous gel base materials have been adopted from the viewpoint of adhesion to biological surfaces and skin followability.

However, conventional pads using gel base materials have relatively thick gel layers formed on both sides of a base material such as nonwoven fabric. From the viewpoint of adhesion to the biological surface, it is necessary to make the gel layer relatively thick. On the other hand, if the thickness of the gel layer on the side fixed to the bioelectrode is increased, the S/N ratio will deteriorate, which may have a negative effect on conductivity, and accurate measurements cannot be made with measuring devices such as diagnostic equipment. In some cases.

[0004] Furthermore, if the gel layer is formed from one side of the base material and oozes out to the back side through the voids in the base material, the conductivity problem of the pad described above is solved, but the ooze area on the back side is There are also problems in that the fixation to the bioelectrode is insufficient because of the stickiness, and that the operability is extremely poor because the base material, such as a nonwoven fabric, is not flexible.

[0005]

[Problems to be Solved by the Invention] The purpose of the present invention is to provide an excellent bioelectrode pad that solves the problems of the conventional bioelectrode pads with respect to conductivity, operability, and fixability to the bioelectrode. It is something to do.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention made extensive studies and found that a frame material is provided around the periphery of the cloth base material to impart shape retention properties and to operate the cloth base material. The present inventors have discovered that excellent connection reliability in terms of electrical conductivity can be obtained by providing an adhesive layer for reliable fixation to the bioelectrode while improving the electrical conductivity, and have completed the present invention.

That is, the bioelectrode pad of the present invention includes a sheet-like frame material provided at the periphery of one or both sides of a cloth base material,
A water-containing gel layer is formed on the surface of the cloth base material on the side that comes into contact with the living body, and an adhesive layer for fixing to the bioelectrode is formed on part or all of the periphery of the base material on the opposite side. This is a characteristic feature.

[0008] The fabric base material used for the bioelectrode pad of the present invention is not particularly limited, and may include polyester, rayon, polypropylene, nylon, vinylon, cotton,
Woven fabrics, non-woven fabrics, knitted fabrics, and net-like fabrics made of cotton, etc.
A fabric base material such as cloth is used. In order to ensure conduction to the back side of the gel layer, such a cloth base material preferably has an effective void having an average diameter of 0.1 mm or more, preferably about 1 to 10 mm, and is particularly preferably in the form of a net. Cloth is used. In addition, the basis weight is 10 to 100g/m2
, preferably about 30 to 70 g/m2. Furthermore, the cloth base material used for the bioelectrode pad of the present invention is
It is preferable to have a gripping piece protruding outward at at least one location on the peripheral edge, since this makes it easier to replace the pad.

[0009] The frame material provided on the peripheral edge of one or both sides of the cloth base material is for imparting shape-retaining properties to the pad of the present invention, and is formed into a so-called frame shape by using an adhesive or an adhesive. Alternatively, it may be provided using heat fusion means or the like. Materials for such frames include, for example, plastic sheets made of polyvinyl chloride, polyester resin, polyolefin resin, polyurethane resin, silicone resin, nonwoven fabrics made of polyester resin, rayon, polyolefin resin, etc., polyurethane resin, polyethylene, etc. Examples include foams and papers, and those with appropriate flexibility are preferred. Moreover, the thickness used is about 0.05 to 1 mm.

[0010] The hydrous gel layer used in the present invention is interposed between the biological electrode and the biological surface to ensure electrical continuity, and preferably has adhesive properties to the biological surface. will be adopted. Examples of the base material for forming the gel layer include water-soluble polymers such as karaya gum, gelatin, polyacrylic acid or its salts, polyacrylamide, polyvinyl alcohol, carboxymethyl cellulose, and polyurethane. Polyhydric alcohols such as glycerin, water, electrolytes, etc. can be added to these base materials as necessary, and crosslinking means can also be applied as appropriate. A particularly preferred base material is a suitable mixture of polyacrylic acid or polyacrylate, glycerin, water, etc. from the viewpoint of quality stability, skin adhesion (adhesiveness), conductivity, shape retention, etc. A hydrogel-like base material subjected to crosslinking is preferred. In addition, the water-containing gel layer may be half-moon shaped or its modified shape, rectangular shape,
It can be provided in any shape such as a circular shape.

[0011] The water contained in such a hydrous gel layer is usually about 5 to 50% by weight, preferably about 10 to 30% by weight. Further, in order to impart skin adhesion and water retention, polyhydric alcohols such as glycerin, polyethylene glycol, and polypropylene glycol are contained in an amount of about 5 to 70% by weight, preferably about 20 to 50% by weight. Furthermore, the thickness of the water-containing gel layer is 0.1 to 3.0 m considering skin conformability (flexibility) and homogeneous conductivity.
m, preferably about 0.5 to 2.0 mm.

[0012] The adhesive layer provided on a part or all of the periphery of the base material on the opposite side to the surface on which the hydrous gel layer is formed in the cloth base material may be one for fixing to the bioelectrode. Therefore, for example, an acrylic adhesive, a rubber adhesive, a silicone adhesive, a vinyl ether adhesive, or the like is formed to a thickness of about 20 to 200 μm.

[0013]

[Example] The bioelectrode pad of the present invention will be briefly described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the bioelectrode pad of the present invention, and FIG. 2 is a plan view thereof. As is clear from FIGS. 1 and 2, a sheet-like frame material 2 is provided at the peripheral edge of the cloth base material 3, which imparts shape retention to the pad and improves operability.

Furthermore, the hydrous gel layer 1 is provided on one side of the cloth base material 3, and is electrically connected to the back surface through the base material 3. An adhesive layer 4 is formed on the back side of the base material 3 at a position corresponding to the portion where the frame material 2 is formed, and is adhesively fixed to the bioelectrode by the adhesive layer 4. Further, the exposed surface of the bioelectrode pad of the present invention is preferably covered with a separator 5 so that the surfaces of the hydrous gel layer 1 and the adhesive layer 4 are not contaminated during storage. Note that the frame material 2 may be formed not only on one side but also on both sides of the cloth base material 3, and the adhesive layer 4 may be formed on the frame material on the back side (not shown).

FIG. 3 is a sectional view showing another embodiment of the bioelectrode pad of the present invention, and FIG. 4 is a plan view thereof. As is clear from FIGS. 3 and 4, it is a double pad, and in principle, it has the same structure as FIGS. 1 and 2. However, in order to ensure reliable fixation to the bioelectrode, the adhesive layer 4 is formed not only on the periphery of the cloth base material 3 but also on the center part (between the places where the hydrous gel layers are placed). A gripping piece 6 is provided at one location on the periphery of the base material 3.

[0016]

[Effects of the Invention] Since the bioelectrode pad of the present invention has the above-described structure, it can be securely fixed to the bioelectrode, has high electrical connection reliability, and Since the frame material is provided, the pad is so-called firm and has good operability (handling properties).

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a bioelectrode pad of the present invention.

FIG. 2 is a plan view of the bioelectrode pad of FIG. 1;

FIG. 3 is a sectional view showing another embodiment of the bioelectrode pad of the present invention.

FIG. 4 is a plan view of the bioelectrode pad of FIG. 3;

[Explanation of symbols]

1 Hydrous gel layer 2 Frame material 3 Cloth base material 4 Adhesive layer 5 Separator 6 Gripping piece

Claims (3)

[Claims] Claim 1: A sheet-like frame material is provided on the periphery of one or both sides of a cloth base material, a hydrous gel layer is formed on the surface of the cloth base material on the biological contact side, and a hydrated gel layer is formed on the periphery of the base material on the opposite side. A pad for a bioelectrode, characterized in that an adhesive layer for fixing to the bioelectrode is formed on part or all of the pad. 2. The bioelectrode pad according to claim 1, wherein the water-containing gel layer is electrically connected to the back surface through the fabric base material. 3. The bioelectrode pad according to claim 1, further comprising an outwardly protruding gripping piece at at least one location on the peripheral edge of the cloth base material.