X-Ray transmissive electrode-shielded wire assembly

• US 4,539,995 A
• Filed: 12/30/1983
• Issued: 09/10/1985
• Est. Priority Date: 11/17/1980
• Status: Expired due to Term

• Current Assignee: Fukuda Denshi Kabushiki Kaisha
• Original Assignee: Fukuda Denshi Kabushiki Kaisha
• Inventors: Segawa, Kiyoshi
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US06/567,397
• Time in Patent Office: 620 Days
• Field of Search: 128/639-641, 128/643, 128/644, 174/36
• US Class Current: 600/385
• CPC Class Codes: A61B 2562/222 Electrical cables or leads therefor, e.g. coaxial cables or ribbon cables
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: H01B 7/0018 Strip or foil conductors H01B7/08 takes precedence
• CPC Class Codes: Y10T 29/49124 On flat or curved insulated base, e.g., printed circuit, etc.

Abstract

An electrode and a lead wire therefor used with a device for measuring the electrical signals emanating from a living body, such as a cardiograph or electroencephalograph employed for examination and diagnostic purposes. The electrode consists of two layers of finely divided electrically conductive material, that are printed in laminated fashion on the opposite surfaces of an insulating film. The lead wire comprises plural laminated layers of finely divided electrically conductive material on the opposite sides of an insulating film, the laminated layers being interspersed with or encased by carbon layers and insulating layers. Since X-rays penetrate the electrode and the lead wire, an X-ray photograph may be taken during visual inspection of the biosignals without the image of the electrode and the lead wire appearing on the film to hinder diagnosis.

Claims

1. An X-ray transmissive electrode-shielded wire assembly designed for extraction and transmission of electrical signals emanating from living bodies, said assembly comprising a base of an insulating sheet material comprising an enlarged portion and an integral elongated strip portion, an electrode and a narrow signal line both mounted on said base and made of electrically conductive material capable of being penetrated by X-rays, said electrode being formed on the surface of one side of said base at said enlarged portion, and said signal line being formed on the surface of the same side of said base strip portion and being electrically connected to said electrode, with said narrow signal line extending longitudinally along said base strip portion, a shielding layer of fine particles of electrically conductive material underlying said electrode and having an area larger than the area of said electrode, said shielding layer being adapted to shield said electrode and being mounted on the surface of the enlarged portion of said base opposite to the surface on which said electrode is mounted, a first layer of electrically conductive material having a width larger than the width of said signal line and arranged on said one side of said base strip portion overlying said signal line, a layer of insulating material located between said signal line and said first layer of electrically conductive material, a second layer of electrically conductive material having a width larger than the width of said signal line and arranged on the opposite side of said base strip portion underlying said signal line, and a first grounding line overlying said insulating layer and a second grounding line underlying said base strip portion, said first and second grounding lines being electrically connected to and arranged longitudinally of said first and second layers of electrically conductive material, said electrode shielding layer being electrically connected to said first and second grounding lines, said signal line being substantially shielded by said first and second layers of electrically conductive material and said first and second grounding lines.

2. An X-ray transmissive electrode-shielded wire assembly according to claim 1 in which said electrode and signal line are integrally formed of a continuous layer of electrically conductive material printed on the surface of said one side of said base.

3. An X-ray transmissive electrode-shielded wire assembly according to claim 2 in which said first and second layers of electrically conductive material comprise layers of fine particles of carbon.

4. An X-ray transmissive electrode-shielded wire assembly according to claim 3 in which said first grounding line comprises a layer of electrically conductive paste printed on the surface of said insulating layer remote from said signal line and in electrical contact with said first layer of electrically conductive material, and the second grounding line comprises a layer of electrically conductive paste printed on the surface of said opposite side of said strip portion in electrical contact with said second layer of electrically conductive material, said electrode shielding layer comprising a layer of electrically conductive material formed integrally with said second grounding line.

5. An X-ray transmissive electrode-shielded wire assembly according to claim 4 in which said signal line, grounding lines, and layers of electrically conductive material are made of materials capable of being penetrated by X-rays.