Electrode layout for blood test sensor strip

• US 10,203,296 B2
• Filed: 05/22/2014
• Issued: 02/12/2019
• Est. Priority Date: 01/19/2010
• Status: Active Grant

• Current Assignee: Embecta Corporation
• Original Assignee: Becton, Dickinson & Co
• Inventors: Mondro, Jason, Schiff, David, Gisler, Scott W.
• Primary Examiner(s): Eiseman, Adam J
• Application Number:
  US14/284,915
• Publication Number:
  US 20140251804A1
• Time in Patent Office: 1,727 Days
• CPC Class Codes: A61B 2562/0295 Strip shaped analyte sensors for apparatus classified in A61B5/145 or A61B5/157
• CPC Class Codes: A61B 2562/046 in a matrix array
• CPC Class Codes: A61B 2562/125 characterised by the manufacture of electrodes
• CPC Class Codes: A61B 5/1411 by percutaneous method, e.g. by lancet
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1477 non-invasive
• CPC Class Codes: A61B 5/1486 using enzyme electrodes, e.g. with immobilised oxidase
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150213 Venting means
• CPC Class Codes: A61B 5/150358 Strips for collecting blood, e.g. absorbent optical reagent test strips G01N21/8483; chemical reagent test strips G01N33/4875, G01N33/52
• CPC Class Codes: A61B 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: A61B 5/1519 comprising driving means, e.g. a spring, for propelling the piercing unit
• CPC Class Codes: A61B 5/157 Devices characterised by integrated means for measuring characteristics of blood
• CPC Class Codes: G01N 27/3271 Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood amperometry per se G01N27/49; aspects concerning the enzyme reagent C12Q1/001
• 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 improved electrode layout for a continuous strip sensor is provided which reduces misalignment of the electrodes with the contacts which read the position of the strip. Better contact with the electrodes reduces or eliminates transient signals between stop positions of the sensor strip.

Claims

1. An elongated sensor strip for use in a blood sample test device, comprising:

a plurality of test sites arranged in series in a travel direction on the strip, wherein each test site includes a lancet hole, electrodes for determining a blood sample volume, and test electrodes for determining a blood sample characteristic, each test site comprising;

a non-conductive substrate layer;

a conductive layer on the substrate layer forming conductive pads arranged in rows and columns and aligned with device contacts in the blood sample test device; and

a non-conductive layer superposed on the conductive layer having a window exposing the rows and columns of conductive pads;

wherein the conductive pads are arranged in at least three rows corresponding, respectively, to a lancing step position, a blood volume detection step position, and a blood characteristic sensing step position, in a lancing/sensing process, and further comprising a fourth row of conductive pads corresponding to a home position before a lancing/sensing process is commenced.

2. The sensor strip according to claim 1, wherein the conductive pads are formed by depositing a conductive layer and etching non-conductive lines to form the rows and columns of conductive pads.

3. The sensor strip according to claim 1, wherein the conductive pads are arranged into at least four columns corresponding to device contacts in the test device.

4. The sensor strip according to claim 1, wherein the strip is provided with a pressure sensor to determine sufficient pressure on the strip prior to conducting a lancing operation.

5. The sensor strip according to claim 1, wherein conductive traces running perpendicular to the travel direction of the strip are covered by a non-conductive cover layer, so that the horizontal traces cannot be contacted by the test device contacts.

6. The sensor strip according to claim 1, wherein each conductive pad has a leading edge in a travel direction of the strip, and the leading edge of at least a first conductive pad in a row is in front of a second conductive pad in the row, so that a signal is obtained from the first conductive pad before a signal is obtained from the second conductive pad.

7. The sensor strip according to claim 1, wherein the conductive layer comprises sputtered metal.

8. The sensor strip according to claim 1, wherein the test electrodes for determining a blood sample characteristic are located in a pair of reagent wells and adapted to perform a blood glucose measurement.

9. The sensor strip according to claim 1, wherein the conductive pads each have a surface area in a range of 1.0 mm² to about 3.0 mm².

10. An elongated sensor strip for use in a blood sample test device, comprising:

a plurality of test sites arranged in series in a travel direction on the strip, wherein each test site includes a lancet hole, electrodes for determining a blood sample volume, and test electrodes for determining a blood sample characteristic, each test site comprising;

a non-conductive substrate layer;

a conductive layer on the substrate layer forming conductive pads arranged in rows and columns and aligned with device contacts in the blood sample test device; and

a non-conductive layer superposed on the conductive layer having a window exposing the rows and columns of conductive pads;

wherein the strip is provided with a pressure sensor to determine sufficient pressure on the strip prior to conducting a lancing operation.

11. The sensor strip according to claim 10, wherein the conductive pads are formed by depositing a conductive layer and etching non-conductive lines to form the rows and columns of conductive pads.

12. The sensor strip according to claim 10, wherein the conductive pads are arranged in at least three rows corresponding, respectively, to a lancing step position, a blood volume detection step position, and a blood characteristic sensing step position, in a lancing/sensing process.

13. The sensor strip according to claim 12, further comprising a fourth row of conductive pads corresponding to a home position before a lancing/sensing process is commenced.

14. The sensor strip according to claim 10, wherein the conductive pads are arranged into at least four columns corresponding to device contacts in the test device.

15. The sensor strip according to claim 10, wherein conductive traces running perpendicular to the travel direction of the strip are covered by a non-conductive cover layer, so that the horizontal traces cannot be contacted by the test device contacts.

16. The sensor strip according to claim 10, wherein each conductive pad has a leading edge in a travel direction of the strip, and the leading edge of at least a first conductive pad in a row is in front of a second conductive pad in the row, so that a signal is obtained from the first conductive pad before a signal is obtained from the second conductive pad.

17. The sensor strip according to claim 10, wherein the conductive layer comprises sputtered metal.

18. The sensor strip according to claim 10, wherein the test electrodes for determining a blood sample characteristic are located in a pair of reagent wells and adapted to perform a blood glucose measurement.

19. The sensor strip according to claim 10, wherein the conductive pads each have a surface area in a range of 1.0 mm² to about 3.0 mm².