Ion-selective electrode having a non-metal sensing element

• US 4,889,612 A
• Filed: 05/22/1987
• Issued: 12/26/1989
• Est. Priority Date: 05/22/1987
• Status: Expired due to Term

• Current Assignee: Abbott Laboratories Incorporated
• Original Assignee: Abbott Laboratories Incorporated
• Inventors: Schapira, Thomas G., Geist, Jill M., Messner, Scott C.
• Primary Examiner(s): Niebling, John F.
• Assistant Examiner(s): GORGOS, KATHRYN L
• Application Number:
  US07/053,446
• Time in Patent Office: 949 Days
• Field of Search: 204/416, 204/418, 204/419, 357/22 B, 357/25
• US Class Current: 204/416
• 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-selective electrode having an electrically insulating substrate with a substantially planar first surface, and having a non-metallic conductor for sensing a potential affixed to the first surface beneath an ion-sensitive membrane. An electrically insulating layer covers at least a portion of the non-metallic conductor and means for making electrical contact with the non-metallic conductor.

Claims

1. An ion-selective electrode comprising:

an electrically insulating substrate having a substantially planar first surface;

a non-metallic conductor coupled to said substrate, said non-metallic conductor comprising graphite;

means, affixed to said first surface and coupled to said conductor, for sensing a potential located at a situs free of metallization, said means for sensing comprising a non-metallic conductive layer and an exposed ion-selective membrane covering said conductive layer; and

an electrically insulating layer covering a portion of said conductor, said electrically insulating layer comprising;

a first stratum affixed to said first surface;

a second stratum wherein at least a portion thereof is intersolubilized with said membrane; and

a third stratum covering said second stratum.

2. An ion-selective electrode comprising:

a substrate;

a field effect transistor on said substrate, said field effect transistor having a gate, a source, and a drain;

a non-metallic, conductive offset gate coupled to said gate of said field effect transistor, said non-metallic, conductive offset gate comprising graphite;

an exposed ion-selective membrane layer covering said offset gate; and

an electrically insulating layer covering at least a portion of said non-metallic conductive offset gate.

3. The ion-selective electrode as recited in claim 2, wherein said electrically insulating layer comprises a first stratum affixed to said substrate, a second stratum wherein at least a portion thereof is intersolubilized with said membrane layer, and a third stratum covering said second stratum.

4. An ion-selective electrode comprising:

an electrically insulating substrate having a first surface;

a metallic conductor at a first situs with respect to said substrate;

a non-metallic conductor connecting said metallic conductor to a separate situs on said first surface, said non-metallic conductor comprising graphite;

an ion-selective membrane layer covering said separate situs; and

an electrically insulating layer covering at least a portion of said non-metallic conductor.

5. The ion-selective electrode as recited in claim 4 wherein said electrically insulating layer comprises a first stratum affixed to said first surface, a second stratum wherein at least a portion thereof is intersolubilized with said membrane layer, and a third stratum covering said second stratum.

6. An ion-selective electrode comprising:

an electrically insulating substrate having a substantially planar first surface;

a non-metallic conductor coupled to said substrate;

means, affixed to said first surface and coupled to said conductor, for sensing a potential located at a situs free of metallization; and

an electrically insulating layer covering a portion of said conductor, said insulating layer forming a well above a portion of said conductor, said means for sensing a potential being provided within said well.

7. An ion-selective electrode comprising:

an electrically insulating substrate;

a field effect transistor formed on said substrate, said field effect transistor having a gate, a source, and a drain;

a non-metallic, conductive offset gate coupled to said gate of said field effect transistor;

an exposed ion-selective membrane layer covering said offset gate; and

an electrically insulating layer covering at least a portion of said non-metallic, conductive offset gate, said insulating layer forming a well above said offset gate, said ion-selective membrane layer being provided within said well.

8. An ion-selective electrode comprising:

an electrically insulating substrate having a first surface and a second surface;

a metallic conductor at a first situs with respect to said substrate;

a non-metallic conductor connecting said metallic conductor to a separate situs on said first surface of said insulating substrate, said non-metallic conductor being on said first surface of said insulating substrate;

an ion-selective membrane layer covering said separate situs; and

an electrically insulating layer covering at least a portion of said non-metallic conductor, said metallic conductor extending from said non-metallic conductor on said first surface of said insulating substrate through said insulating substrate to said second surface of said insulating substrate.