Systems and methods for blood glucose sensing
First Claim
1. A method of measuring glucose in a blood sample, said method comprising:
- providing a test strip, said test strip having a sample chamber, with a working electrode, a counter electrode, a pair of fill-detect electrodes, and a reagent layer disposed in said sample chamber, said reagent layer including glucose oxidase and a mediator, said test strip including an auto-on conductor;
inserting said test strip into a meter, said meter being in a sleep mode;
said meter detecting an auto-on current through said auto-on conductor and responsively entering an active mode;
said meter validating said working and counter electrodes by applying a first validation voltage between said working and counter electrodes;
said meter validating said fill-detect electrodes by applying a second validation voltage between said fill-detect electrodes, while said first validation voltage is applied between said working and counter electrodes;
applying said blood sample to said sample chamber;
said meter detecting said blood sample at a first location in said sample chamber by applying a drop-detect voltage between said working and counter electrodes and measuring a drop-detect current flowing between said working and counter electrodes;
said meter detecting said blood sample at a second location in said sample chamber by applying a fill-detect voltage between said fill-detect electrodes and measuring a fill-detect current flowing between said fill-detect electrodes;
after waiting an incubation time period, said meter applying an assay voltage between said working and counter electrodes and making at least one measurement of the resulting current through said working electrode; and
said meter determining a measured glucose level from said at least one current measurement.
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Accused Products
Abstract
A system for measuring a glucose level in a blood sample includes a test strip and a meter. The test strip includes a sample chamber, a working electrode, a counter electrode, fill-detect electrodes, and an auto-on conductor. A reagent layer is disposed in the sample chamber. The auto-on conductor causes the meter to wake up and perform a test strip sequence when the test strip is inserted in the meter. The meter uses the working and counter electrodes to initially detect the blood sample in the sample chamber and uses the fill-detect electrodes to check that the blood sample has mixed with the reagent layer. The meter applies an assay voltage between the working and counter electrodes and measures the resulting current. The meter calculates the glucose level based on the measured current and calibration data saved in memory from a removable data storage device associated with the test strip.
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Citations
19 Claims
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1. A method of measuring glucose in a blood sample, said method comprising:
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providing a test strip, said test strip having a sample chamber, with a working electrode, a counter electrode, a pair of fill-detect electrodes, and a reagent layer disposed in said sample chamber, said reagent layer including glucose oxidase and a mediator, said test strip including an auto-on conductor; inserting said test strip into a meter, said meter being in a sleep mode; said meter detecting an auto-on current through said auto-on conductor and responsively entering an active mode; said meter validating said working and counter electrodes by applying a first validation voltage between said working and counter electrodes; said meter validating said fill-detect electrodes by applying a second validation voltage between said fill-detect electrodes, while said first validation voltage is applied between said working and counter electrodes; applying said blood sample to said sample chamber; said meter detecting said blood sample at a first location in said sample chamber by applying a drop-detect voltage between said working and counter electrodes and measuring a drop-detect current flowing between said working and counter electrodes; said meter detecting said blood sample at a second location in said sample chamber by applying a fill-detect voltage between said fill-detect electrodes and measuring a fill-detect current flowing between said fill-detect electrodes; after waiting an incubation time period, said meter applying an assay voltage between said working and counter electrodes and making at least one measurement of the resulting current through said working electrode; and said meter determining a measured glucose level from said at least one current measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of using a test strip to test a blood sample, said test strip including a sample chamber, a working electrode, a counter electrode, a pair of fill-detect electrodes, and an auto-on conductor, said method comprising:
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inserting said test strip into a meter, said meter being in a sleep mode; said meter detecting an auto-on current through said auto-on conductor and responsively entering an active mode; said auto-on current developing an auto-on voltage drop across said auto-on conductor; applying said blood sample to said sample chamber; said meter detecting said blood sample in said sample chamber by applying a fill-detect voltage between said fill-detect electrodes and measuring a fill-detect current flowing between said fill-detect electrodes; said meter applying an assay voltage between said working and counter electrodes and making at least one measurement of the resulting current; and said meter determining a test result from said at least one current measurement. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification