Concentric electrode construction for an electrocardiogram transmitter

• US 3,868,947 A
• Filed: 10/16/1973
• Issued: 03/04/1975
• Est. Priority Date: 10/16/1973
• Status: Expired due to Term

• Current Assignee: William P. Holsinger
• Original Assignee: William P. Holsinger
• Inventors: Holsinger, William P.
• Primary Examiner(s): Gaudet, Richard A.
• Assistant Examiner(s): Cohen, Lee S.
• Application Number:
  US05/406,870
• Time in Patent Office: 504 Days
• Field of Search: 128/2.6E,2.1E,DIG.4,2.6B,2.6R,404,410,411,416,418
• US Class Current: 600/382
• CPC Class Codes: A61B 5/28 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/30 Input circuits therefor

Abstract

An electrode assembly for generating electrocardiogram bioelectric potential signals suitable for wave-form analysis is disclosed. The electrode assembly comprises two separate transmitter electrodes adapted to be placed on the skin of a subject. Each electrode includes a central conducting surface and an outer conducting surface disposed in surrounding relationship about the periphery of the central conducting surface, the outer conducting surface being spaced from the central conducting surface by an intermediate insulating barrier region. The outer conducting surfaces of each electrode are connected in common and to a common ground of a differential amplifier. The central conducting surface of each of the electrodes is connected to a different respective input of the differential amplifier whereby a signal representative of the bioelectric potential is provided at the differential amplifier output.

Claims

1. An electrode assembly for generating electrocardiogram bioelectric potential signals suitable for wave-form analysis, said assembly comprising:

two separate transmitter electrodes adapted to be placed on a subject'"'"''"'"'s skin in electrical contact therewith, each electrode comprising a flat exposed disc which includes an electrically conductive central disc Member and an outer conducting ring disposed in surrounding relationship about the periphery of said central conductive member, said outer conducting ring being spaced from said central conductive member by an intermediate insulating annulus, said central conductive member, said outer conducting ring, and said insulating annulus being coplanar and concentrically disposed;

means for electrically coupling said outer conducting rings of each said electrode in common and to a common ground of a differential amplifier; and

means for electrically connecting said central conductive member of each said electrode to a different respective input of the differential amplifier, whereby a signal representative of the bioelectric potential is produced at the differential amplifier output.

2. An electrode assembly as defined in claim 1, wherein said central conductive disc and said outer conducting ring are constructed of stainless steel, and wherein said insulating annulus is of epoxy.