Electrochemical cell

• US 6,521,110 B1
• Filed: 11/10/2000
• Issued: 02/18/2003
• Est. Priority Date: 11/16/1995
• Status: Expired due to Term

• Current Assignee: Lifescan Incorporated (Duv Holding Corporation)
• Original Assignee: Lifescan Incorporated (Duv Holding Corporation)
• Inventors: Maxwell, Ian Andrew, Hodges, Alastair McIndoe, Johansen, Oddvar, Beck, Thomas William
• Primary Examiner(s): Warden, Jill
• Assistant Examiner(s): NOGUEROLA, ALEXANDER STEPHAN
• Application Number:
  US09/709,968
• Time in Patent Office: 830 Days
• Field of Search: 204/403.01, 204/403.14, 204/416
• US Class Current: 204/403.14
• CPC Class Codes: C12Q 1/004 mediator-assisted
• CPC Class Codes: C12Q 1/006 for glucose
• 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 method of manufacture of a thin layer electrochemical cell (FIGS. 12, 14) comprising the steps of:

forming an aperture (11) extending through a sheet (1) of electrically resistive material, said aperture defining a side wall of the cell,

mounting a first thin electrode layer (13) to one side of the sheet and extending over aperture (11) whereby to define a cell first end wall,

mounting a second thin electrode layer (13) to the other side of the sheet and extending over aperture (11) whereby to define a second cell end wall in substantial overlying registration with the first electrode, and

providing means (16) for admission of a liquid into the cell.

Claims

1. An electrochemical sensor for analytic determination using a liquid sample, comprising a substantially flat strip having a thickness, the strip having a first lateral edge and a second lateral edge, a sample-receiving cell within the strip, at least two electrodes in communication with the cell, a first notch through the entire thickness of the strip in the first lateral edge, and a second notch through the entire thickness of the strip in the second lateral edge, wherein the notches are in fluid communication with the cell and allow entry of the liquid sample into the cell.

2. The sensor of claim 1, further comprising a vent in communication with the cell, the vent being adapted to allow air to escape the cell to facilitate entry into the cell by the liquid sample.

3. The sensor of claim 1, wherein the entry of the liquid sample into the cell occurs via capillary action.

4. The sensor of claim 1, wherein the sample-receiving cell comprises at least one reagent.

5. The sensor of claim 4, wherein the reagent comprises a catalyst, a redox reagent, or a surfactant.

6. The sensor of claim 4, wherein the reagent comprises an enzyme.

7. The sensor of claim 4, wherein the reagent comprises a glucose oxidase.

8. The sensor of claim 4, wherein the reagent comprises ferricyanide.

9. The sensor of claim 1, wherein at least one notch has a rectangular profile.

10. The sensor of claim 9, wherein at least one notch has a square profile.

11. The sensor of claim 1, the sensor having a distal edge, the distal edge comprising a socket region, the strip having a first comer where the distal edge meets the first lateral edge, the strip having a second comer where the distal edge meets the second lateral edge, wherein a distance between the center of the first notch and the first comer is substantially the same as a distance between the center of the second notch and the second comer.

12. The sensor of claim 1, wherein at least one of the first lateral edge and the second lateral edge are substantially straight.

13. The sensor of claim 1, wherein the first lateral edge and the second lateral edge are substantially parallel.

14. The sensor of claim 1, wherein the cell is cylindrical in shape.

15. The sensor of claim 1, wherein the first notch intersects a wall of the cell at a position where the wall of the cell is closest to the first lateral edge.

16. The sensor of claim 1, wherein the second notch intersects a wall of the cell at a position where the wall of the cell is closest to the second lateral edge.