ANALYTICAL TEST STRIP WITH CROSSROADS EXPOSED ELECTRODE CONFIGURATION

• US 20110290668A1
• Filed: 05/27/2010
• Published: 12/01/2011
• Est. Priority Date: 05/27/2010
• Status: Abandoned Application

• Current Assignee: LifeScan Scotland Limited (Johnson & Johnson)
• Original Assignee: LifeScan Scotland Limited (Johnson & Johnson)
• Inventors: MOFFAT, James, Marshall, Robert, Setford, Steven, Whyte, Lynsey
• Application Number:
  US12/788,639
• Publication Number:
  US 20110290668A1
• Time in Patent Office: Days
• US Class Current: 205/777.5
• CPC Class Codes: G01N 27/3272 Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels optical biosensors G01N33/52

Abstract

An electrochemical-based analytical test strip for the determination of an analyte (such as glucose) in a bodily fluid sample (for example, whole blood) includes an electrically insulating base layer, a patterned conductor layer disposed over the electrically-insulating layer, and a patterned insulation layer, with an electrode exposure window therethrough, disposed over the patterned conductor layer. The patterned conductive layer of the electrochemical-based analytical test strip includes at least one working electrode and a counter/reference electrode. In addition, at least a portion of the electrode exposure window is configured to expose a working electrode exposed portion and a counter/reference electrode exposed portion, with the working electrode exposed portion being rectangular in shape and the counter/reference electrode exposed portion being one of a crossroads shape and an at least six-sided portion of a crossroads shape.

Claims

1. An electrochemical-based analytical test strip for the determination of an analyte in a bodily fluid sample, the electrochemical-based analytical test strip comprising:

an electrically insulating base layer;

a patterned conductor layer disposed over the electrically-insulating layer, the patterned conductive layer including at least a working electrode and a counter/reference electrode; and

a patterned insulation layer disposed over the patterned conductor layer, the patterned insulation layer having an electrode exposure window therethrough,

wherein at least a portion of the electrode exposure window is configured to expose a working electrode exposed portion and a counter/reference electrode exposed portion, and

wherein the working electrode exposed portion is rectangular in shape and the counter/reference electrode exposed portion is one of a crossroads shape and an at least six-sided portion of a crossroads shape.

2. The electrochemical-based analytical test strip of claim 1 wherein the electrode exposure window is crossroads shaped.

3. The electrochemical-based analytical test strip of claim 1 wherein the counter/reference electrode exposed portion has a crossroads shape when the patterned insulation layer has nominal registration with the patterned conductor layer.

4. The electrochemical-based analytical test strip of claim 1 wherein the counter/reference electrode exposed portion has a six-sided portion of a crossroads shape when the patterned insulation layer has worst-case registration with the patterned conductor layer.

5. The electrochemical-based analytical test strip of claim 1 further including:

a patterned adhesive layer,

wherein the patterned adhesive layer and the electrode exposure window are configured to jointly define the counter/reference electrode exposed portion.

6. The electrochemical-based analytical test strip of claim 5 wherein the patterned adhesive layer is also configured to define a sample-receiving chamber.

7. The electrochemical-based analytical test strip of claim 1 wherein the patterned conductor layer includes a first working electrode, a second working electrode and a single counter/reference electrode, and

wherein the at least a portion of the electrode exposure window is configured to expose a first working electrode exposed portion and a second working electrode exposed portion, and

wherein the first working electrode exposed portion and the second working electrode exposed portion are rectangular in shape.

8. The electrochemical-based analytical test strip of claim 7 wherein the single counter/reference electrode is disposed between the first working electrode and the second working electrode.

9. The electrochemical-based analytical test strip of claim 8 wherein the electrode exposure window is crossroads in shape.

10. The electrochemical-based analytical test strip of claim 1 wherein the analyte is glucose and the bodily fluid sample is blood.

11. The electrochemical-based analytical test strip of claim 1 wherein the electrode exposure window has an asymmetric crossroads shape.

12. A method for determining an analyte in a bodily fluid sample, the method comprising:

applying a bodily fluid sample to an electrochemical-based analytical test strip having;

an electrically insulating base layer;

a patterned conductor layer disposed over the electrically-insulating layer, the patterned conductive layer including at least a working electrode and a counter/reference electrode; and

a patterned insulation layer disposed over the patterned conductor layer, the patterned insulation layer having an electrode exposure window therethrough,

wherein at least a portion of the electrode exposure window is configured to expose a working electrode exposed portion and a counter/reference electrode exposed portion, and

wherein the working electrode exposed portion is rectangular in shape and the counter/reference electrode exposed portion is one of a crossroads shape and an at least six-sided portion of a crossroads shape;

measuring an electrochemical response of the electrochemical-based analytical test strip; and

determining the analyte based on the measured electrochemical response.

13. The method of claim 12 wherein the analyte is glucose

14. The method of claim 13 wherein the bodily fluid sample is whole blood.

15. The method of claim 12 wherein the electrode exposure window is crossroads shaped.

16. The method of claim 12 wherein the counter/reference electrode exposed portion has a crossroads shape.

17. The method of claim 12 further including:

a patterned adhesive layer,

wherein the patterned adhesive layer and the electrode exposure window are configured to jointly define the counter/reference electrode exposed portion.

18. The method of claim 17 wherein the patterned adhesive layer is also configured to define a sample-receiving chamber.

19. The method of claim 12 wherein the patterned conductor layer includes a first working electrode, a second working electrode and a single counter/reference electrode, and

wherein the at least a portion of the electrode exposure window is configured to expose a first working electrode exposed portion and a second working electrode exposed portion, and

wherein the first working electrode exposed portion and the second working electrode exposed portion are rectangular in shape.

20. The method of claim 19 wherein the single counter/reference electrode is disposed between the first working electrode and the second working electrode.

21. The method of claim 20 wherein the electrode exposure window is crossroads in shape.

22. The method of claim 12 wherein the electrode exposure window has an asymmetric crossroads shape.