Miniaturized oxygen electrode

• US 5,326,450 A
• Filed: 12/08/1992
• Issued: 07/05/1994
• Est. Priority Date: 03/20/1991
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Suzuki, Hiroaki, Sugama, Akio, Kojima, Naomi
• Primary Examiner(s): Niebling, John
• Assistant Examiner(s): Bell, Bruce F.
• Application Number:
  US07/987,163
• Time in Patent Office: 574 Days
• Field of Search: 204/403, 204/414, 204/415, 204/153.17, 204/412, 204/416
• US Class Current: 204/403.06
• CPC Class Codes: G01N 27/3272 Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels optical biosensors G01N33/52
• CPC Class Codes: G01N 27/404 Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid , e.g. Clark-type oxygen sensors

Abstract

A miniaturized oxygen electrode which comprises: an electrically insulating substrate; an electrolyte-containing material disposed on the substrate and capable of serving as an electrolytic solution when supplied with water; a set of component electrodes disposed on the substrate and composed of a first component electrode on which a reduction reaction of oxygen dissolved in the electrolytic solution occurs when the miniaturized oxygen electrode is operated and one or more second component electrodes other than the first component electrode, the first component electrode being interconnected with the second component electrodes through the electrolyte-containing material; an oxygen gas-permeable membrane covering the electrolyte-containing material; and the electrolyte-containing material having a length for providing a sufficient distance along the interconnection between the first and second component electrodes such that any electroactive substances, formed on one of the first and second component electrodes during the operation of the miniaturized oxygen electrode, are prevented from reaching the other of the first and second component electrodes when diffusing along the length of the electrolytic solution.

Claims

1. A miniaturized oxygen electrode device comprising:

an electrically insulating substrate;

a pair of component electrodes disposed on said insulating substrate;

an electrolyte-containing material interconnecting said component electrodes,

one of said pair of component electrodes being an oxygen reducing electrode during operation of said miniaturized oxygen electrode device; and

an oxygen gas-permeable membrane covering said electrolyte material,

said electrolyte-containing material having an elongated shape providing a length of material between said component electrodes which is effective for preventing any electroactive substance formed on either of said component electrodes during operation of said oxygen electrode device from diffusing along said material to the other of said component electrodes.

2. A device as set forth in claim 1, wherein one of said component electrodes is a cathode.

3. A device as set forth in claim 1, wherein said one of said pair of component electrodes comprises a working electrode, the other of said pair of electrodes comprises a counter electrode, and said device includes a reference electrode which is connected to said material.

4. A device as set forth in claim 1, wherein said material has an elongated, narrow shape presenting a restricted cross-sectional configuration.

5. A device as set forth in claim 2, wherein said material has an elongated, narrow shape presenting a restricted cross-sectional configuration.

6. A device as set forth in claim 3, wherein said material has an elongated, narrow shape presenting a restricted cross-sectional configuration.

7. A device as set forth in claim 4, wherein said material has an elongated, narrow shape presenting a restricted cross-sectional configuration.

8. A device as set forth in claim 1, wherein said material has a serpentine or meandering shape.

9. A device as set forth in claim 2, wherein said material has a serpentine or meandering shape.

10. A device as set forth in claim 3, wherein said material has a serpentine or meandering shape.

11. A device as set forth in claim 4, wherein said material has a serpentine or meandering shape.

12. A device as set forth in claim 5, wherein said material has a serpentine or meandering shape.

13. A device as set forth in claim 6, wherein said material has a serpentine or meandering shape.

14. A device as set forth in claim 7, wherein said material has a serpentine or meandering shape.