JPS58183137A - Gel pad for living body electrode - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

This invention is a book related to improvements in gel pads for bioelectrodes used when measuring biopotential. Generally, when measuring biopotential using an electrocardiograph or electroencephalogram needle, the electrodes are connected to the skin surface! To improve sweat retention, a gel-like pad is inserted between the buttons. However, conventional gel-like pads tend to explode, for example, when used in heated rooms in the winter or in low humidity**, the pads may transfer images and have poor adhesion to the skin surface. In addition, the conductivity of the pad also deteriorates, making it impossible to measure the potential. Therefore, in research on how to improve the water retention properties of pads, the present inventor conducted research on pads that are non-toxic, non-irritating, have good compatibility with the gel material, and do not alter the gel material (1). Furthermore, the present invention has been accomplished by learning of a substance that can increase the water retention of Kurado. That is, the purpose of the present invention is to overcome the drawbacks of the conventional gel-like pads mentioned above. The object of the present invention is to provide a gel-like pad for a bioelectrode that can be used satisfactorily. The present invention is a gel-like pad for a bioelectrode, which is made by adding a conductive and adhesive gel to a mesh-like powder material in an edible form and adding one or more polyhydric alcohols to the gel-like pad. Suitable gel materials are those that are conductive and adhesive when formed into a gel, and that are easily peeled off from the skin; for example, sodium polyacrylate may be used.

[Ru, ge,
, c) Moisture and viscosity] The content is in a range that provides good U properties and good shape retention, for example, in the case of crosslinked sodium polyacrylate, it is about 50 to 70%. The net-like base material may be made of synthetic resin, or may be made of solid material such as Japanese paper or gauze. As the polyhydric alcohol, divalent ethylene glycol, trivalent glycerol, tetravalent erythrol, pentavalent bentitol, hexavalent hexitol, and each of these isomers and other liquid polyhydric alcohols are employed. These polyhydric alcohols have good properties such as high water retention, low toxicity and irritation, good compatibility with gel materials, and do not denature gel materials. be. The amount of polyhydric alcohol added should be at least about 10% (li: amount) based on the gel, and should be 30 to 40%.
It is possible to reach a cliff of about 70% of the height of q6. The attached moisture-proof film is convenient because it can be easily peeled off before use. Since the gel-like pad for biological electrodes of the present invention is a conductive and adhesive gel, it has good adhesion to the biological skin surface and can be inserted between the electrode for potential measurement and the skin surface! Of course, the gel of the pad contains polyhydric alcohol, so even at high temperatures or low humidity, the gel retains water well, and the gel is hardened by transfer. It is convenient because M force can be used for a long period of time. Next, 1 of the present invention! An example will be explained. A gel-like pad with a thickness of 3 m is made by adhering and impregnating a gel of cross-linked sodium polyacrylate containing 65q6 water onto a coarse material made of synthetic resin ψ fibers.1 Next, this gel-like pad in a 70% aqueous sorbitol solution (
15°C) and left for 2 days to allow sorbitol to permeate into the gel pad. After that, the gel-like pad was extracted with an aqueous sorbitol solution, placed on a nylon net, and left at room temperature for 3 to 4 days to form a hard-to-dry gel that uniformly contains sorbitol inside. Get a pad. That is, Figure 1 and! As shown in Figure 2, the gel pad 1 of this example is made by impregnating a coarse mesh fabric 2 with gel of cross-linked sodium polyacrylate to form a gel layer 5, and gel #3 is impregnated with sorbitol. It's a book. In addition, moisture-proof films 4, 4 are attached to both sides of the gel-like pad 1 to prevent stickiness during storage, making it easier to handle, and the moisture-proof films 4, 4 are peeled off before use. The gel-like pad of this example contains 60% water and about 30% sorbitol. The obtained gel-like pad 1 of this example is a gel-like pad (vs. $) that does not contain sorbyl. : When the drying speed was compared, when the control pad was left in a room at 25°C and 30% relative humidity, the gel-like pad of this example hardened in about 4 hours. After using the pad for 2 days, the book hardly became dry or hard. Next K [As shown in Figure 3, when the pad 1 of this example was placed between the sandwich-type V pole 5 of the electrocardiograph and the skin of the subject's arm 6 and the cardiac potential was measured,
A completely normal electrocardiogram was obtained. In addition, the gel-like bag of this example
□When RAD 1 was used, the subject's skin remained supple after the pad was removed, and there were no abnormalities on the skin after the pad was removed. Therefore, the gel-like pad for a bioelectrode of the present invention achieves the intended purpose and is good.

[Brief explanation of the drawing]

The figures show examples of the present invention, so Figure 1 is an enlarged cross-sectional view of a gel-like pad for living body TW, η42 is a Sakaki barrel with the moisture-proof film removed and partially broken, and w, Figure 3 shows a bear using the pad. 1... Gel-like pad 2... Beak-shaped entity 3... Gel layer

Claims (1)

[Claims] A gel-like pad for a double-hole bioelectrode, which is a gel-like pad containing a conductive and adhesive gel in a net-like base material, and is characterized by adding at least about 10% of a type of polyhydric alcohol. .