Body electrodes

• US 4,166,453 A
• Filed: 01/17/1978
• Issued: 09/04/1979
• Est. Priority Date: 01/21/1977
• Status: Expired due to Term

• Current Assignee: CardioArt Technologies Ltd.
• Original Assignee: CardioArt Technologies Ltd.
• Inventors: McClelland, Brian
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US05/870,251
• Time in Patent Office: 595 Days
• Field of Search: 128/2.06 E, 128/2.1 E, 128/404, 128/410, 128/411, 128/416-418, 128/DIG. 4
• US Class Current: 600/396
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/263 characterised by the electrode materials
• CPC Class Codes: A61B 5/265 containing silver or silver chloride
• CPC Class Codes: A61B 5/266 containing electrolytes, conductive gels or pastes
• CPC Class Codes: A61B 5/268 containing conductive polymers, e.g. PEDOT:PSS polymers

Abstract

An electrode suitable for use in conducting electrical signals from the skin of a living animal, the electrode having a conducting member constituted by an electrically conducting plastics material and an electrically conducting chloride gel carried by a porous foam disc for contact with the skin, the porous foam disc being spaced from the conducting member by a non-electrically conducting element which is loaded with silver to provide electrical connection between the gel and the member.

Claims

1. An electrode which is suitable for use in conducting electrical signals from the skin of a living animal, the said electrode including a member to which electrical connection can be made, the member being constituted by an electrically conducting plastics material, a first element carrying an electrically conducting gel, means for holding said first element to allow said first element to be positioned on the skin of an animal with the gel in electrical contact with the said skin and a silver loaded element of nonelectrically conducting material positioned between said first element and said member to provide a physical barrier between said member and first element to substantially prevent gel from reaching said member and an electrical connection via the silver loading between the gel and the member, whereby an electrical connection can be made between the skin and the member and the possibility of developing an off-set potential is reduced.

2. An electrode as claimed in claim 1 wherein said holding means includes a second annular member, the first mentioned and second members defining a cavity and the silver loaded element and the element carrying the gel being housed in the cavity.

3. An electrode as claimed in claim 1 wherein the electrically conducting plastics material is constituted by a carbon loaded ethylene vinyl acetate co-polymer.

4. An electrode as claimed in claim 1 wherein the silver loaded element is constituted by a non-woven fabric material.

5. An electrode as in claim 1, wherein said silver loaded element is substantially impervious to said gel.