COATED ION MEASURING ELECTRODE

• US 3,635,212 A
• Filed: 03/03/1969
• Issued: 01/18/1972
• Est. Priority Date: 03/03/1969
• Status: Expired due to Term

• Current Assignee: Hideo Watanabe, John E. Leonard
• Original Assignee: Hideo Watanabe, John E. Leonard
• Inventors: Watanabe, Hideo, Leonard, John E.
• Primary Examiner(s): Kaplan, G. L.
• Application Number:
  US04/803,813
• Time in Patent Office: 1,051 Days
• Field of Search: 128/2R,2.1E 204/195G,195M,195B,1T 128/2E
• US Class Current: 600/348
• CPC Class Codes: G01N 27/3335 the membrane containing at least one organic component G01N27/3271 takes precedence; aspects concerning the enzyme reagent in enzyme electrodes C12Q1/001

Abstract

An ion measuring electrode is disclosed in which the ion sensitive barrier thereof is coated with reconstituted cellulose which is applied to the electrode in such a manner that the cellulose coating will remain on the electrode even after continued use thereof. The invention is particularly applicable to the coating of glass electrodes mounted in catheters utilized in the in vivo ion concentration measurements of body fluids.

Claims

2. An electrode assembly as set forth in claim 1 wherein said barrier is formed of ion sensitive glass.

3. An electrode assembly as set forth in claim 2 wherein:

said tubular member comprises a catheter formed of a polymeric material; and

said derivative of cellulose is a substance that adheres firmly to said catheter even when wetted and subjected to tension.

4. An electrode assembly as set forth in claim 1 wherein said derivative of cellulose is selected from the group consisting of cellulose nitrate and cellulose acetate.

5. An electrode assembly as set forth in claim 1 wherein a section of said portion of said tube is formed of a polymeric material.

6. In an electrode assembly for ion concentration measurements having an ion sensitive barrier mounted at the end of a tubular member and a coating of reconstituted cellulOse covering said barrier, the improvement which comprises:

said tubular member comprising a metal tube mounted in the end of an nonconductive tube; and

said coating of reconstituted cellulose covering only said barrier and metal tube.

7. An electrode assembly as set forth in claim 6 wherein said nonconductive tube is a catheter formed of a polymeric material.

8. An electrode assembly as set forth in claim 7 wherein a glass tube is mounted within said metal tube and said ion sensitive barrier is formed of ion sensitive glass and is sealed to said glass tube.

9. An electrode assembly as set forth in claim 6 wherein said metal tube is formed of substantially chemically inert metal.