Electrode structure for reducing irritation to the skin

• US 6,336,049 B1
• Filed: 07/07/1999
• Issued: 01/01/2002
• Est. Priority Date: 07/08/1998
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Kinbara, Matsuro, Maruyama, Kohji
• Primary Examiner(s): Schaetzle, Kennedy
• Application Number:
  US09/348,756
• Time in Patent Office: 909 Days
• Field of Search: 604/20, 607/115, 607/142, 607/148, 607/152, 607/153, 600/374, 600/393, 600/395-397, 606/41, 606/32
• US Class Current: 607/148
• CPC Class Codes: A61N 1/0436 Material of the electrode
• CPC Class Codes: A61N 1/044 Shape of the electrode

Abstract

An electrode structure containing plural electrode elements each comprising an electrode and an electrolyte layer laminated thereon, the electrode of each electrode element being connected to a power supply and the electrolyte layer to be in contact with the skin, wherein the plural electrode elements are insulated from each other and the electrode of each element is electrically connected to a resistor that limits the current flowing through this electrode, the resistor having a resistance that is ⅕-5 times the resistance of the skin. The present invention provides an electrode structure capable of making the density of the current flowing to the skin constant, irrespective of the electrification method, and capable of reducing irritation due to the electrification.

Claims

1. An electrode structure comprising:

a plurality of electrode elements, each of said electrode elements comprising an electrode for connection to a power supply and an electrolyte layer for contact with skin having a resistance, said electrolyte layer being laminated on said electrode;

an insulating substrate, having a first side and a second side, wherein said electrode elements are disposed on said first side of said insulating substrate, and wherein said electrode elements are insulated from each other by a partition; and

at least one resistor comprising at least one resistive element having a resistance that is ⅕

to 5 times the resistance of the skin;

wherein said electrode of each electrode element is electrically connected to said at least one resistive element via a conductive path formed in said insulating substrate.

2. The electrode structure of claim 1, wherein said insulating substrate has a wiring layer disposed on said second side of said substrate, said wiring layer connecting said at least one resistive element to a terminal for connection to a power supply.

3. The electrode structure of claim 1, wherein said electrodes of said plurality of electrode elements are electrically connected to said at least one resistive element by wiring.

4. The electrode structure of claim 3, wherein said insulating substrate comprises a substrate extension projecting from a part of said substrate, said wiring comprising a plurality of wires disposed on said substrate extension, said wires being connected to a first connector for wire extension, and said first connector being fixed to said substrate extension.

5. The electrode structure of claim 4, wherein a second connector, being attached to a first end of an electric cable, is electrically connected to said first connector on said first end of said electric cable;

and wherein a third integration connector, having attached thereto said at least one resistive element, is connected to said second connector on a second end of said electric cable, thereby electrically connecting said at least one resistive element to said electrodes.

6. The electrode structure of claim 1, wherein said electrode of each electrode element has a circular or polygonal shape and an area of less than 1 cm^2.

7. The electrode structure of claim 1, wherein said electrode of each of said electrode elements has at least one layer comprising a member selected from the group consisting of carbon, silver, silver chloride, metal foils, binder resins and mixtures thereof .

8. The electrode structure of claim 7, wherein said binder resin comprises a member selected from the group consisting of phenolic resins, polyester resins, epoxy resins, acrylic resins and mixtures thereof.

9. The electrode structure of claim 7, wherein said electrode comprises a carbon layer and a layer comprising silver.

10. The electrode structure of claim 7, wherein said electrode comprises a carbon layer and a layer comprising silver and silver chloride.

11. The electrode structure of claim 7, wherein said electrode has a carbon layer which comprises a composition comprising carbon particles and a binder resin.

12. The electrode structure of claim 1, wherein said resistive element comprises a composition comprising fine carbon particles and a binder resin.

13. The electrode structure of claim 1, wherein said partition is made from a flexible insulating material.

14. The electrode structure of claim 13, wherein said flexible insulating material is selected from the group consisting of silicone resins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, propylene copolymer resins and mixtures thereof.

15. The electrode structure of claim 1, wherein said partition has a shape permitting adhesion to each electrode element and is a formed article having a thickness of not less than 0.1 mm and a height of 1-5 mm.

16. The electrode structure of claim 1, wherein said partition and said insulating substrate form an integrated product.

17. The electrode structure of claim 1, wherein said insulating substrate, said partition or both comprise a material selected from the group consisting of polyimides, polyethylene terephthalates, polypropylenes, polyamides and mixtures thereof.