Temperature indicating electrotherapy electrode/coil and method of use

• US 4,669,480 A
• Filed: 09/29/1986
• Issued: 06/02/1987
• Est. Priority Date: 10/16/1985
• Status: Expired due to Term

• Current Assignee: Murray Electronics Associates Limited Partnership
• Original Assignee: Murray Electronics Associates Limited Partnership
• Inventors: Hoffman, Kent C.
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): SHAY, RANDY CITRIN
• Application Number:
  US06/912,565
• Time in Patent Office: 246 Days
• Field of Search: 128/639-641, 128/736, 128/798, 128/802, 128/803, 374/162
• US Class Current: 600/392
• CPC Class Codes: A61N 1/0408 Use-related aspects
• CPC Class Codes: A61N 1/0456 Specially adapted for transcutaneous electrical nerve stimulation [TENS]
• CPC Class Codes: A61N 1/0472 Structure-related aspects
• CPC Class Codes: A61N 1/0492 Patch electrodes A61N1/0412, A61N1/0428 take precedence

Abstract

Apparatus and method for applying an electric or electromagnetic signal to the skin and tissue of a living body surface, and for measuring the physiological responses of the skin and tissue to the electric or electromagnetic signal is disclosed. The apparatus comprises a conductive patch electrode applicator, or coil applicator, a temperature responsive liquid crystal layer applied to said conductive patch, and an adhesive boundary extending at least part way about the edges of the electrode applicator or coil applicator.

Claims

1. An apparatus for applying an electromagnetic signal to the skin and tissue of a living subject, and for measuring the physiological responses of the skin and tissue to said electromagnetic signal, said apparatus comprising:

an inductive coil attached to an electrical connection terminal;

a temperature responsive liquid crystal layer affixed to said inductive coil;

an adhesive boundary extending at least part way about the edges of said inductive coil.

2. An apparatus as in claim 1 wherein:

said adhesive boundary comprises an adhesive-backed flexible insulating sheet having said inductive coil with said liquid crystal layer applied thereon on one adhesive-coated side; and

further including a release liner releasably attached to and covering the otherwise remaining exposed adhesive-backing of said sheet prior to its intended usage.

3. An apparatus as in claim 2 further comprising electrical snap-on terminals affixed to said inductive coil and extending through apertures in said sheet towards the other side of said sheet.

4. An apparatus as in claim 2 wherein said liquid crystal layer has a border with a fixed color-temperature reference scale imprinted thereon.

5. A method of electrotherapeutic treatment comprising the steps of:

adhesively attaching a conductive patch having a temperature responsive liquid crystal layer affixed thereto to a surface of a living subject;

imposing an electric current in the living subject via said conductive patch;

visually monitoring said liquid crystal layer to detect and monitor the temperature of said conductive patch and thus to monitor the quality of the physiological link to said subject.

6. A method as in claim 5 wherein said attaching step includes the step of attaching an inductive coil to said surface of a living subject.

7. A method as in claim 5 further comprising the step of applying an electrode preparation between said conductive patch and the body surface.