Biophysical electrode

• US 3,989,036 A
• Filed: 04/02/1975
• Issued: 11/02/1976
• Est. Priority Date: 04/02/1975
• Status: Expired due to Term

• Current Assignee: DIA Medical System Company Limited
• Original Assignee: DIA Medical System Company Limited
• Inventors: Sasamori, Soichiro
• Primary Examiner(s): Michell, Robert W.
• Assistant Examiner(s): Cohen, Lee S.
• Application Number:
  US05/564,302
• Time in Patent Office: 580 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 2562/0215 Silver or silver chloride containing
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/257 using adhesive means, e.g. adhesive pads or tapes
• CPC Class Codes: A61B 5/265 containing silver or silver chloride
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287

Abstract

An electrode comprising a discoid, hard and porous insulating member and a conductive electrode member connected with a lead wire and closely adhering to one side of said insulating member, wherein all of these components excluding the area of the exterior of said insulating member that comes in contact with the skin are covered with a housing and said insulating member is impregnated with a solution of chloride.

Claims

1. A biophysical electrode, comprising:

a porous, water-permeable, ceramic, insulating member of disclike shape adapted to be impregnated with a conductive liquid, said member having a portion of one surface thereof adapted to be placed in surface-to-surface contact with body tissue;

a silver coating film deposited directly on and covering the entire surface of said member except said surface portion thereof, said silver film defining an electrode;

an insulating housing encapsulating and in air-tight contact with said silver film, said housing having an opening exposing said surface portion of said member; and

an electrical conductive lead in electrical contact with said silver film and extending through the housing.

2. A biophysical electrode as claimed in claim 1 in which said ceramic insulating member is made of alumina.

3. A biophysical electrode as claimed in claim 2 in which said ceramic insulating member is impregnated with a solution of a chloride selected from the group consisting of potassium chloride, sodium chloride and calcium chloride.

4. A biophysical electrode as claimed in claim 1 in which said exposed surface portion of said ceramic insulating member has a plurality of integral projections extending outwardly therefrom.

5. A biophysical electrode as claimed in claim 1 including a conduit connected to said ceramic insulating member and extending through said silver film and said housing and adapted for supplying the conductive liquid to said ceramic insulating member.

6. A biophysical electrode as claimed in claim 1 wherein said lead is a terminal that projects through the housing and terminates adjacent to the outside thereof and is adapted for electrical connection to a conductor.

7. A biophysical electrode as claimed in claim 1 wherein said lead is an electrical wire.

8. A biophysical electrode as claimed in claim 1 in which said ceramic insulating member is a planar disc, said silver film covers the edge and one surface of said disc, the other surface of said disc forming said surface portion, and said housing has a marginal edge portion of the opening thereof overlapping the marginal edge portion of the other surface of said disc.