Electrochemical sensor strip

• US 7,387,714 B2
• Filed: 11/06/2003
• Issued: 06/17/2008
• Est. Priority Date: 11/06/2003
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Gundel, Douglas B.
• Primary Examiner(s): Noguerola; Alex
• Application Number:
  US10/702,827
• Publication Number:
  US 20050098433A1
• Time in Patent Office: 1,685 Days
• Field of Search: 20440301-40315, 205/777.5, 205/792, 205/778
• US Class Current: 204/400
• CPC Class Codes: G01N 27/3272 Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels optical biosensors G01N33/52

Abstract

Provided is a single use electrochemical sensor strip having an active portion and an inactive portion. The inactive portion may be a handling strip. Another aspect provided is an article comprising an electrochemical sensor strip having a fluid-wicking channel that terminates at one end with a fluid sample entrance, wherein the fluid sample entrance traverses the end of the fluid-wicking channel at an angle of less than 90°. Another aspect provided an article comprising an electrochemical sensor strip having a fluid-wicking channel that extends across the width of a portion of the sensor strip which portion is narrower than the width of the remainder of the sensor strip. Also provided are methods for making electrochemical sensor strip.

Claims

1. An article comprising a single use electrochemical sensor strip having a length and a width with an active portion and at least one inactive portion, wherein the total area of the at least one inactive portion is greater than the area of the active portion, wherein the active portion has a length and a width, and wherein the length of the active portion is perpendicular to the length of the sensor strip.

2. The article of claim 1 wherein the inactive portion comprises a handling tab.

3. The article of claim 2 wherein the handling tab is bent at one or both ends.

4. The article of claim 2 wherein the handling tab is textured.

5. The article of claim 1 wherein the active portion comprises a fluid wicking channel.

6. The article of claim 1 wherein the inactive portion is about 5 mm to about 25 mm wide and about 10 mm to about 50 mm long.

7. The article of claim 1 wherein the active portion is about 3 mm to about 10 mm wide and about 5 mm to about 25 mm long.

8. The article of claim 1 wherein the active portion is at one end of the sensor strip.

9. The article of claim 1 wherein the active portion is in the center of the sensor strip.

10. The article of claim 1 comprising

a backing material,

a circuit laminated to a portion of the backing material to form the active portion, the remaining portion of the backing material forming the inactive portion, the circuit comprising:

a substrate,

a patterned conductive layer comprising contact pads, traces and electrodes,

a polymeric layer comprising a channel-forming material, and

a hydrophilic layer.

11. The article of claim 10 wherein a reagent layer is applied to the electrodes.

12. The article of claim 1 wherein the sensor strip is a blood glucose sensor strip.

13. An article comprising a blood glucose test kit comprising the electrochemical sensor strip of claim 12 and a glucose measuring device.

14. The article of claim 1 wherein the electrochemical sensor strip further comprises a fluid-wicking channel that terminates at one end with a fluid sample entrance, wherein the fluid sample entrance traverses the end of the fluid-wicking channel at an angle of less than 90.

15. The article of claim 14 wherein the angle is 45.

16. The article of claim 15 wherein the fluid sample entrance is 1.4 times an entrance that intersects the fluid-wicking channel at an angle of 90.

17. The article of claim 14 wherein the fluid-wicking channel is open to the atmosphere at both ends.

18. The article of claim 14 wherein the fluid-wicking channel transports fluid to at least one electrode by capillary action.

19. The article of claim 14 wherein the fluid-wicking channel has a volume of less than about one microliter.