System for analyte determination that includes a permutative grey scale calibration pattern

• US 20070273902A1
• Filed: 05/26/2006
• Published: 11/29/2007
• Est. Priority Date: 05/26/2006
• Status: Active Grant

• Current Assignee: Cilag Gmbh International (Johnson & Johnson), LifeScan IP Holdings, LLC
• Original Assignee: LifeScan Scotland Limited (Johnson & Johnson)
• Inventors: McInulty, John, Baskeyfield, Damian Edward Haydon, Robinson, Grenville Arthur, Cronshaw, Anthony J., O'Reilly, Thomas J.
• Granted Patent: US 7,589,828 B2
• Time in Patent Office: Days
• US Class Current: 358/1.900
• CPC Class Codes: A61B 2562/0295 Strip shaped analyte sensors for apparatus classified in A61B5/145 or A61B5/157 disposable multilayered or laminated electrodes G01N27/307; details of handling chemical test elements G01N33/4875
• CPC Class Codes: A61B 2562/085 combined with means for recording calibration data
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: G01N 33/48771 Coding of information, e.g. calibration data, lot number

Abstract

A system for measuring an analyte in a body fluid sample includes a meter, with a grey scale photodetector module, and a memory module. The system also includes a test strip. The test strip has a substrate with a working surface for receiving the body fluid sample and a reverse surface that is in opposition to the working surface. The test strip also includes a permutative grey scale calibration pattern disposed on either of the working and reverse surfaces, with the permutative grey scale calibration pattern including more than one grey scale region. Moreover, the scale regions of the test strip define a grey scale permutation that uniquely corresponds to a calibration code of the test strip. The grey scale photodetector module is configured to detect the permutative grey scale calibration pattern of the test strip when the test strip is inserted into the meter. The memory module has stored therein a grey scale permutation matrix with a plurality of calibration codes, each of the calibration codes uniquely corresponding to a grey scale permutation of the permutative grey scale calibration pattern.

Claims

1. A system for measuring an analyte in a body fluid sample, the system comprising;

a meter with;

a grey scale photodetector module; and

a memory module; and

at least one test strip,

wherein the test strip includes;

a substrate, the substrate having;

a working surface for receiving the body fluid sample; and

a reverse surface that is in opposition to the working surface; and

a permutative grey scale calibration pattern disposed on at least one of the working surface and reverse surface, the permutative grey scale calibration pattern including at least a first grey scale region and a second grey scale region, wherein the grey scale shade of the at least first and second grey scale regions constitute a grey scale permutation that uniquely corresponds to a calibration code, and

wherein the grey scale photodetector module is configured to detect the permutative grey scale calibration pattern of the test strip when the test strip is inserted into the meter, and

wherein the memory module has stored therein a grey scale permutation matrix with a plurality of calibration codes, each of the calibration codes uniquely corresponding to a grey scale permutation of the permutative grey scale calibration pattern.

2. The system of claim 1 further including a microprocessor module configured to employ a calibration code in an algorithm during the determination of an analyte in a body fluid sample.

3. The system of claim 1 wherein the test strip has the permutative grey scale calibration pattern is disposed on the reverse surface.

4. The system of claim 1 wherein the permutative grey scale calibration pattern includes two grey scale regions.

5. The system of claim 1 wherein the permutative grey scale calibration pattern includes a first grey scale region, a second grey scale region and a third grey scale region.

6. The system of claim 1 wherein the grey scale calibration pattern further includes at least one optics calibration region.

7. The system of claim 6 wherein the at least one optics calibration region has a black optics calibration region and a white optics calibration region.

8. The system of claim 6 wherein the at least one optics calibration region further has a 50% grey scale optics calibration region.

9. The system of claim 6 wherein the at least one optics calibration region further has a 25% grey scale optics calibration region and a 75% grey scale optics calibration region.

10. The system of claim 1 wherein the test strip is an electrochemical test strip.

11. The system of claim 10 wherein the test strip is configured for the determination of glucose in a whole blood sample.

12. The system of claim 1 wherein the test strip is a photometric test strip.

13. The system of claim 12 wherein the test strip is configured for the determination of glucose in a whole blood sample.