Transient decay amperometry biosensors
First Claim
1. A biosensor for determining an analyte concentration in a sample, comprising:
- a measurement device having a processor in electrical communication with a sensor interface; and
a sensor strip having a sample interface on a base, the sensor interface in electrical communication with the sample interface, the sample interface in electrical communication with a reservoir formed by the base;
where the processor is configured to instruct a charger to apply an input signal including excitations and relaxations to the reservoir after an incubation period of at most 8 seconds, andwhere the processor is configured for determining the analyte concentration in the sample from an output signal of at least one excitation, the output signal having a transient decay in response to a redox reaction of a measurable species, the measurable species formed by way of a redox reaction of a portion of the analyte in the sample, andwhere the transient decay is not inversely related to the square root of time and has a decay constant greater or less than −
0.5.
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Accused Products
Abstract
A biosensor system determines an analyte concentration of a biological sample using an electrochemical process without Cottrell decay. The biosensor system generates an output signal having a transient decay, where the output signal is not inversely proportional to the square root of the time. The transient decay is greater or less than the −0.5 decay constant of a Cottrell decay. The transient decay may result from a relatively short incubation period, relatively small sample reservoir volumes, relatively small distances between electrode surfaces and the lid of the sensor strip, and/or relatively short excitations in relation to the average initial thickness of the reagent layer. The biosensor system determines the analyte concentration from the output signal having a transient decay.
237 Citations
29 Claims
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1. A biosensor for determining an analyte concentration in a sample, comprising:
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a measurement device having a processor in electrical communication with a sensor interface; and a sensor strip having a sample interface on a base, the sensor interface in electrical communication with the sample interface, the sample interface in electrical communication with a reservoir formed by the base; where the processor is configured to instruct a charger to apply an input signal including excitations and relaxations to the reservoir after an incubation period of at most 8 seconds, and where the processor is configured for determining the analyte concentration in the sample from an output signal of at least one excitation, the output signal having a transient decay in response to a redox reaction of a measurable species, the measurable species formed by way of a redox reaction of a portion of the analyte in the sample, and where the transient decay is not inversely related to the square root of time and has a decay constant greater or less than −
0.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification