# US 8,771,202 B2 · Electrode layout for blood test sensor strip

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- Number: US 8,771,202 B2
- Document ID: US8771202B2
- Status: Granted
- Kind: B2
- Application number: 12/689,654
- Filed: 2010-01-19
- Published: 2011-07-21
- Granted: 2014-07-08
- Earliest claimed: 2010-01-19
- Assignees: Becton, Dickinson and Company
- Applicants: Jason Mondro; David Schiff; Scott W. Gisler
- Inventors: Jason Mondro; David Schiff; Scott W. Gisler
- Web page: https://patentgrep.com/patent/US8771202B2

## CPC

- G01N 27/3272: {Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels (optical biosensors G01N33/52)}
- A61B 5/14532: {for measuring glucose, e.g. by tissue impedance measurement}
- A61B 5/1477: non-invasive
- A61B 5/1486: using enzyme electrodes, e.g. with immobilised oxidase
- A61B 5/150022: {for capillary blood or interstitial fluid}
- A61B 5/150213: {Venting means}
- A61B 5/150358: {Strips for collecting blood, e.g. absorbent}
- A61B 5/150412: {Pointed piercing elements, e.g. needles, lancets for piercing the skin (blade-like piercing elements A61B5/150442)}
- A61B 5/150503: {Single-ended needles (hollow piercing element tip design A61B5/150396)}
- A61B 5/1519: {comprising driving means, e.g. a spring, for propelling the piercing unit}
- A61B 5/157: {Devices} characterised by integrated means for measuring characteristics of blood
- 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)}
- A61B 5/1411: {by percutaneous method, e.g. by lancet}
- A61B 2562/0295: Strip shaped analyte sensors for apparatus classified in A61B5/145 or A61B5/157
- A61B 2562/046: in a matrix array
- A61B 2562/125: characterised by the manufacture of electrodes
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 7)

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