Novel electrode design for biosensor

• US 20050284758A1
• Filed: 01/12/2005
• Published: 12/29/2005
• Est. Priority Date: 06/18/2004
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Operations Limited (Roche Holding AG)
• Inventors: Joseph, Abner D., Funke, Tom, Riggles, Randall K.
• Granted Patent: US 7,556,723 B2
• Time in Patent Office: Days
• US Class Current: 204/403.02
• CPC Class Codes: G01N 27/3272 Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels optical biosensors G01N33/52

Abstract

A test strip for measuring a signal of interest in a biological fluid when the test strip is mated to an appropriate test meter, wherein the test strip and the test meter include structures to verify the integrity of the test strip traces, to measure the parasitic resistance of the test strip traces, and to provide compensation in the voltage applied to the test strip to account for parasitic resistive losses in the test strip traces. In addition, conductive traces are positioned to ensure structural interrogation of all electrodes and traces present upon the test strip.

Claims

1. An electrochemical test strip powered by a power source comprising:

a first measurement electrode;

a first conductive trace operatively coupled to the first measurement electrode,

wherein the distance between at least one point on the first conductive trace and the power source is greater than or equal to the distance between any point on said first measurement electrode and the power source;

a second measurement electrode; and

a second conductive trace operatively coupled to the second measurement electrode;

wherein the distance between at least one point on the second conductive trace and the power source is greater than or equal to the distance between any point on said second measurement electrode and the power source.

2. The test strip of claim 1 wherein said first measurement electrode comprises a plurality of fingers.

3. The test strip of claim 1 wherein said second measurement electrode comprises a plurality of fingers.

4. The test strip of claim 2 wherein said fingers include a reagent to create an electrical potential in a fluid sample that is indicative of a desired fluid quality to be measured by the test strip.

5. The test strip of claim 3 wherein said fingers include a reagent to create an electrical potential in a fluid sample that is indicative of a desired fluid quality to be measured by the test strip.

6. An electrochemical test strip powered by a power source comprising:

a measurement electrode;

a conductive trace operatively coupled to the measurement electrode, wherein the distance between at least one point on the conductive trace and the power source is greater than or equal to the distance between any point on said measurement electrode and the power source.

7. The test strip of claim 6 wherein said measurement electrode comprises a plurality of fingers.

8. The test strip of claim 6 further comprising an additional measurement electrode.

9. The test strip of claim 8 further comprising an additional conductive trace operatively coupled to said additional measurement electrode.

10. The test strip of claim 7 wherein said fingers further comprise a reagent to create an electrical potential in a fluid sample that is indicative of a desired fluid quality to be measured by the test strip.

11. An electrochemical test strip powered by a power source comprising:

a reagent diposed within a region on the test strip;

a first measurement electrode;

a first conductive trace operatively coupled to the first measurement electrode, wherein the distance between at least one point on the first conductive trace and the power source is greater than or equal to the distance between any point on said first measurement electrode within said region and the power source;

a second measurement electrode; and

a second conductive trace operatively coupled to the second measurement electrode,

wherein the distance between at least one point on the second conductive trace and the power source is greater than or equal to the distance between any point on said second measurement electrode within said region and the power source.

12. The test strip of claim 11 wherein said first measurement electrode comprises a plurality of fingers.

13. The test strip of claim 11 wherein said second measurement electrode comprises a plurality of fingers.

14. An electrochemical test strip powered by a power source comprising:

a reagent disposed within a region on the test strip;

a measurement electrode;

a conductive trace operatively coupled to the measurement electrode, wherein the distance between at least one point on the conductive trace and the power source is greater than or equal to the distance between any point on said measurement electrode within said region and the power source.

15. The test strip of claim 14 wherein said measurement electrode comprises a plurality of fingers.

16. The test strip of claim 14 further comprising an additional measurement electrode.

17. The test strip of claim 16 further comprising an additional conductive trace operatively coupled to said additional measurement electrode.