Reference electrode error trap determined from a specified sampling time and a pre-determined sampling time
First Claim
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1. An analyte measurement system with electrode error determination, the system comprising:
- a test strip including;
a substrate;
a plurality of electrodes connected to respective electrode connectors with a reagent disposed proximate the plurality of the electrodes, the plurality of electrodes comprising;
physical characteristic sensing electrodes;
a first working electrode and a second working electrode; and
a reference electrode; and
an analyte meter including;
a housing;
a test strip port connector configured to connect to the respective electrode connectors of the test strip; and
a microprocessor in electrical communication with the test strip port connector to apply electrical signals or measure electrical signals from the plurality of electrodes, wherein the microprocessor is configured to;
(a) apply a first signal to the physical characteristic sensing electrodes of the plurality of electrodes to determine a physical characteristic of a fluid sample;
(b) apply a second signal between the first working electrode and the reference electrode, and between the second working electrode and the reference electrode to determine an analyte concentration of the fluid sample;
(c) measure a signal output proximate a specified sampling time point from each of the first and second working electrodes;
(d) measure another signal output proximate a predetermined sampling time point from each of the first and second working electrodes;
(e) calculate a first differential between a signal output of the first working electrode measured at the specified sampling time point and a signal output of the first working electrode measured at the predetermined sampling time point;
(f) calculate a second differential between a signal output of the second working electrode measured at the specified sampling time point and a signal output of the second working electrode measured at the predetermined sampling time point;
(g) evaluate whether any one of the first differential and second differential is less than a predetermined threshold to determine an error; and
(h) in the event one of the first and second differentials is less than a bias threshold then annunciate the error.
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Abstract
Various embodiments for a method that allow for a more accurate analyte concentration with a biosensor by determining at least one physical characteristic of the sample and determining whether a counter or reference electrode is causing an error by monitoring the working electrodes and flagging an error if the signal outputs of the working electrodes do not meet certain thresholds.
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Citations
6 Claims
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1. An analyte measurement system with electrode error determination, the system comprising:
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a test strip including; a substrate; a plurality of electrodes connected to respective electrode connectors with a reagent disposed proximate the plurality of the electrodes, the plurality of electrodes comprising; physical characteristic sensing electrodes; a first working electrode and a second working electrode; and a reference electrode; and an analyte meter including; a housing; a test strip port connector configured to connect to the respective electrode connectors of the test strip; and a microprocessor in electrical communication with the test strip port connector to apply electrical signals or measure electrical signals from the plurality of electrodes, wherein the microprocessor is configured to; (a) apply a first signal to the physical characteristic sensing electrodes of the plurality of electrodes to determine a physical characteristic of a fluid sample; (b) apply a second signal between the first working electrode and the reference electrode, and between the second working electrode and the reference electrode to determine an analyte concentration of the fluid sample; (c) measure a signal output proximate a specified sampling time point from each of the first and second working electrodes; (d) measure another signal output proximate a predetermined sampling time point from each of the first and second working electrodes; (e) calculate a first differential between a signal output of the first working electrode measured at the specified sampling time point and a signal output of the first working electrode measured at the predetermined sampling time point; (f) calculate a second differential between a signal output of the second working electrode measured at the specified sampling time point and a signal output of the second working electrode measured at the predetermined sampling time point; (g) evaluate whether any one of the first differential and second differential is less than a predetermined threshold to determine an error; and (h) in the event one of the first and second differentials is less than a bias threshold then annunciate the error. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification