Electrode layout for blood test sensor strip

• US 8,771,202 B2
• Filed: 01/19/2010
• Issued: 07/08/2014
• 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): Hindenburg, Max
• Assistant Examiner(s): EISEMAN, ADAM JARED
• Application Number:
  US12/689,654
• Publication Number:
  US 20110174637A1
• Time in Patent Office: 1,631 Days
• Field of Search: 600/575, 600/573, 600/584, 606/181, 606/182, 204/400, 204/403.01, 204/403.02, 204/403.03
• US Class Current: 600/583
• 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. A blood sample acquisition and sensing system, comprising:

device contacts;

an elongated strip having 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, test electrodes for determining a blood sample characteristic, and a plurality of conductive pads that are arranged in a matrix of rows and columns and are aligned to make electrical contact with the device contacts, wherein the conductive pads for the electrodes are electrically connected to the electrodes by respective conductive traces, wherein the conductive pads for the test electrodes are electrically connected to the test electrodes by respective conductive traces, and wherein a leading edge in the travel direction of a first conductive pad in a row is in front of a leading edge in the travel direction of a second conductive pad in the same row;

a lancet and lancet injector;

a motor adapted to advance the strip; and

a processor adapted to receive signals produced when the device contacts make electrical contact with the conductive pads on the strip and adapted to communicate with the lancet injector to perform a lancing operation, the motor to perform a strip advance operation, and the test electrodes to perform a blood sample characteristic measurement operation.

2. The system according to claim 1, wherein the conductive pads on the strip 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.

3. The system according to claim 2, further comprising a fourth row of conductive pads corresponding to a home position before a lancing/sensing process is commenced.

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

5. The system according to claim 1, further comprising a pressure sensor on the strip communicating with the processor to signal sufficient pressure to initiate the lancing/sensing process.

6. The system according to claim 1, wherein a non-conductive layer covers the conductive traces connecting the conductive pads to the electrodes or the test electrodes, as the case may be, and prevents the device contacts from directly contacting the conducting traces.

7. The system according to claim 1, wherein the device contacts, strip, lancet, motor and processor are positioned in a unitary housing.

8. The system according to claim 7, wherein the housing includes user-operable controls and a display.