JPS6317446B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a porous silver-silver chloride electrode lead for detecting electrical signals generated from a living body or a porous silver-silver chloride electrode lead for measuring electrochemical properties. It is.

Silver-silver chloride electrodes are considered to have the best characteristics as skin electrodes for detecting low-level electrical signals from the skin surface of living organisms. has a porous structure. Therefore, when connecting a lead wire to an electrode pellet, if you directly connect an electrochemically base metal conductor that is different from the component metal that makes up the electrode pellet, when it comes into contact with the electrolyte, the liquid will penetrate the porous body. It may reach the connection and elute the electrochemically base metal used as the lead wire, causing the electrode potential to fluctuate significantly and making highly accurate measurements impossible.

In order to prevent such a phenomenon, a lead wire connection method as shown in FIG. 1 or 2 has conventionally been used. Specifically, when deriving a signal from the porous silver-silver chloride electrode pellet 1, the silver deriving wire 2 or the silver deriving piece 3 is pressed together with the silver-silver chloride powder on the back side of the electrode surface to integrate it. A lead 4 made of a copper wire was connected to the silver lead-out part by a solder connection part 5, and the silver lead-out part 2 or 3 and the copper lead 4 were molded with an electrically insulating resin 6. In such a method, the silver lead wire 2 or the silver lead piece 3
In order to press pressure weld together silver-silver chloride powder,
Not only does the mold structure of the press machine become complicated,
The bonding strength between the silver-silver chloride porous body and the silver lead-out portion 2 or 3 was not uniform, and there were drawbacks such as the silver lead-out wire 2 coming off and the silver lead-out piece 3 peeling off.

The present invention has been made in view of the above points, and when connecting a lead wire to a porous silver-silver chloride electrode pellet for biological use or a porous silver-silver chloride pellet for electrochemical measurement, a metal core is used as the conductor of the lead wire. When using a composite metal conductor with a silver coating layer on the outer periphery of the body and connecting it to a porous silver-silver chloride electrode pellet, the tip surface of the composite metal conductor should not come into contact with the porous silver-silver chloride electrode pellet. By embedding the silver coating layer, excluding the tip surface of the composite metal conductor, in the conductive silver paste connecting material, the conductor part of the lead wire will not be eluted by the electrolyte, and the electrode potential will fluctuate. This is an electrode lead that prevents this.

The present invention will be explained below with reference to FIG. 3. Reference numeral 1 indicates a porous silver-silver chloride electrode pellet into which an electrolytic solution can freely permeate. Reference numeral 9 denotes a lead wire, and the conductor of this lead wire 9 is formed of a composite metal conductor 7 having a silver coating layer 7b of 2 to 3 microns on the outer periphery of a metal core 7a. 5' is a connecting material, which is a conductive silver paste for firmly connecting the porous silver-silver chloride electrode pellet 1 and the composite metal conductor 7 of the lead wire 9, and 8 is the tip surface of the composite metal conductor 7, which is a metal core 7a. is exposed.

Lead wire 9 to porous silver-silver chloride electrode pellet 1
When connecting the composite metal conductors 7 with conductive silver paste 5', the tip surface 8 of the composite metal conductor 7 is not embedded in the conductive silver paste 5', but is exposed in the air, and the silver coating of the composite metal conductor 7a is connected. The layer 7b portion is embedded and solidified by heating in a drying oven at 120° C. for 15 minutes to firmly connect. Thereafter, the entire porous silver-silver chloride electrode pellet 1, except for the sample-facing surface 1a, is molded with an electrically insulating resin such as polyethylene to form an electrode lead.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing a conventional electrode lead connection method. FIG. 3 is a sectional view showing the connection method of the present invention. 1...Porous silver-silver chloride electrode pellet, 1a...
...Sample facing surface, 2...Silver lead-out wire, 3...Silver lead-out piece, 4...Copper lead, 5...Solder connection part, 5'
... Conductive silver paste, 6 ... Resin mold, 7
...Composite metal conductor, 7a...Metal core, 7b...
Silver coating layer, 8... Composite metal lead wire tip surface, 9...
…Lead.

Claims (1)

[Claims] 1. An electrode lead in which a lead wire is connected to a porous silver-silver chloride electrode pellet, and the electrode pellet, the lead wire, and the outer periphery of the connection thereof are integrally molded with electrically insulating resin, leaving the surface of the electrode pellet facing the specimen. The conductor of the lead wire is formed of a composite metal conductor with a silver coating layer provided on the outer periphery of a metal core, and the connection part between the composite metal conductor and the porous silver-silver chloride electrode pellet is made of a conductive silver paste connecting material. An electrode lead characterized in that the tip end surface of the composite metal conductor is arranged so as not to come into contact with the porous silver-silver chloride electrode pellet and the conductive silver paste connecting material when the composite metal conductor is connected and solidified.