Circuit for electrochemical sensor strip

• US 7,419,573 B2
• Filed: 11/06/2003
• Issued: 09/02/2008
• 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, ALEXANDER STEPHAN
• Application Number:
  US10/702,344
• Publication Number:
  US 20050098432A1
• Time in Patent Office: 1,762 Days
• Field of Search: 20440301-40315, 204416-418, 204/400, 205/777.5, 205/778, 205/792
• US Class Current: 204/403.04
• 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 an electrochemical sensor strip having circuits comprising electrodes in an electrode region connected to contact pads in a contact region by conductive traces wherein the electrode region is off-set from the contact region in both an x direction parallel to the length of the sensor strip and a y direction parallel to the width of the sensor strip. Also provided is a an electrochemical sensor strip having a backing material, an active portion laminated to a portion of the backing material, the active portion comprising a substrate, a circuit comprising electrodes in an electrode region connected to contact pads in a contact region by conductive traces wherein the electrode region is off-set from the contact region in both an x direction parallel to the length of the sensor strip and a y direction parallel to the width of the sensor strip, a polymeric layer comprising a channel-forming material over the electrodes, and a hydrophilic layer over the channel-forming material.

Claims

1. An article comprising an electrochemical sensor strip having circuits comprising electrodes in an electrode region connected to contact pads in a contact region by conductive traces wherein the electrode region is off-set from the contact region in both an x direction parallel to the length of the sensor strip and a y direction parallel to the width of the sensor strip, wherein the electrode region and contact region are off-set such that they form an L shape, the interior of which shape forms an edge of the sensor strip and wherein the electrode region protrudes beyond the contact region in the x direction, wherein the circuits are located in an active portion and the article further comprises an inactive portion, and wherein the inactive portion comprises a handling tab.

2. The article of claim 1 wherein the handling tab is bent at one or both ends.

3. The article of claim 1 wherein the handling tab is textured.

4. 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.

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

6. An article comprising a blood glucose test kit comprising the electrochemical sensor strip of claim 5 and a glucose measuring device having a slot that receives the sensor strip article wherein when the sensor strip is fully inserted into the slot the electrode region of the sensor remains outside of the slot.

7. An article comprising an electrochemical sensor strip having circuits comprising electrodes in an electrode region connected to contact pads in a contact region by conductive traces wherein the electrode region is off-set from the contact region in both an x direction parallel to the length of the sensor strip and a y direction parallel to the width of the sensor strip, wherein the electrode region and contact region are off-set such that they form an L shape, the interior of which shape forms an edge of the sensor strip and wherein the electrode region protrudes beyond the contact region in the x direction, wherein the circuits are located in an active portion and the article further comprises an inactive portion, and further comprising a fluid-wicking channel that extends across the length of the electrode region, wherein the fluid-wicking channel 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, and wherein the length of the electrode region is less than one-half of the width of the circuit.

8. The article of claim 7 wherein the angle is 45.

9. The article of claim 8 wherein the fluid sample entrance is 1.4 times an entrance that intersects the fluid-wicking channel at an angle of 90.

10. The article of claim 7 wherein the fluid-wicking channel is open to the atmosphere at both ends.

11. The article of claim 7 wherein the fluid-wicking channel transports fluid to the electrodes by capillary action.

12. The article of claim 7 wherein the fluid-wicking channel has a volume of less than about one microliter.