Underfill management system for a biosensor
First Claim
1. A biosensor system for determining an analyte concentration in a sample, the biosensor system comprising:
- a test sensor having a sample interface and a reservoir, the sample interface being in electrical communication with the reservoir, the reservoir including a counter electrode and a working electrode, the sample interface having conductors connected to the counter electrode and the working electrode;
a portable measurement device having a processor, a sensor interface, and a storage medium, the sensor interface being in electrical or optical communication with the sample interface of the test sensor, the processor being connected to the sensor interface and in electrical communication with the storage medium, the storage medium storing at least one reference correlation pre-determined with a reference instrument, the processor being programmed to;
apply a potential across the working electrode and the counter electrode,based on the applied potential, determine an initial fill state of the test sensor to be an initial underfill state in which an insufficient volume of sample is present in the reservoir,signal for adding sample in the reservoir until the test sensor has a sufficient volume of sample, the sufficient volume of sample changing the initial underfill state of the test sensor to a subsequent substantially full-fill state,apply an analytic test excitation signal to the sufficient volume of sample,generate at least one analytic output signal value responsive to the concentration of the analyte in the sufficient volume of sample and the analytic test excitation signal,compensate for underfill error in the at least one analytic output signal value in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, wherein the compensating for the underfill error includes;
adjust the reference correlation with a compensation system, the compensation system including at least one index function previously determined from an error parameter, the compensation system applying one or more compensation equations in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, anddetermine an analyte concentration in the sample from the at least one analytic output signal value and the adjusting of the reference correlation; and
a display communicatively coupled to the processor for displaying an error signal when there is an insufficient volume of sample, the display further displaying a numerical reading indicative of the analyte concentration in the sample.
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Accused Products
Abstract
A biosensor system including the underfill management system determines the analyte concentration in a sample from the at least one analytic output signal value. The underfill management system includes an underfill recognition system and an underfill compensation system. The underfill recognition system determines whether the test sensor initially is substantially full-filled or underfilled, indicates when the sample volume is underfilled so that additional sample may be added to the test sensor, and starts or stops the sample analysis in response to the sample volume. The underfill recognition system also may determine the initial degree of underfill. After the underfill recognition system determines the initial fill state of the test sensor, the underfill compensation system compensates the analysis based on the initial fill state of the test sensor to improve the measurement performance of the biosensor system for initially underfilled test sensors.
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Citations
18 Claims
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1. A biosensor system for determining an analyte concentration in a sample, the biosensor system comprising:
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a test sensor having a sample interface and a reservoir, the sample interface being in electrical communication with the reservoir, the reservoir including a counter electrode and a working electrode, the sample interface having conductors connected to the counter electrode and the working electrode; a portable measurement device having a processor, a sensor interface, and a storage medium, the sensor interface being in electrical or optical communication with the sample interface of the test sensor, the processor being connected to the sensor interface and in electrical communication with the storage medium, the storage medium storing at least one reference correlation pre-determined with a reference instrument, the processor being programmed to; apply a potential across the working electrode and the counter electrode, based on the applied potential, determine an initial fill state of the test sensor to be an initial underfill state in which an insufficient volume of sample is present in the reservoir, signal for adding sample in the reservoir until the test sensor has a sufficient volume of sample, the sufficient volume of sample changing the initial underfill state of the test sensor to a subsequent substantially full-fill state, apply an analytic test excitation signal to the sufficient volume of sample, generate at least one analytic output signal value responsive to the concentration of the analyte in the sufficient volume of sample and the analytic test excitation signal, compensate for underfill error in the at least one analytic output signal value in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, wherein the compensating for the underfill error includes; adjust the reference correlation with a compensation system, the compensation system including at least one index function previously determined from an error parameter, the compensation system applying one or more compensation equations in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, and determine an analyte concentration in the sample from the at least one analytic output signal value and the adjusting of the reference correlation; and a display communicatively coupled to the processor for displaying an error signal when there is an insufficient volume of sample, the display further displaying a numerical reading indicative of the analyte concentration in the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A biosensor measurement device for determining an analyte concentration in a sample, the biosensor measurement device comprising:
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a sample interface in electrical communication with a reservoir in which a sample is received; a counter electrode and a working electrode positioned in the reservoir; a sensor interface in electrical communication with the sample interface; a storage medium storing at least one reference correlation pre-determined with a reference instrument; a processor connected to the sensor interface and in electrical communication with the storage medium, the processor being programmed to; apply a potential across the working electrode and the counter electrode, based on the applied potential, determine an initial fill state of the reservoir to be an initial underfill state in which an insufficient volume of sample is present, signal for adding sample until the reservoir has a sufficient volume of sample, the sufficient volume of sample changing the initial underfill state of the test sensor to a subsequent substantially full-fill state, apply an analytic test excitation signal to the sufficient volume of sample, generate at least one analytic output signal value responsive to the concentration of the analyte in the sufficient volume of sample and the analytic test excitation signal, compensate for underfill error in the at least one analytic output signal value in response to the initial underfill state and the subsequent substantially full-fill state of the reservoir, wherein the compensating for the underfill error includes; adjust the reference correlation with a compensation system, the compensation system including at least one index function previously determined from an error parameter, wherein the compensation system applies one or more compensation equations in response to the initial underfill state and the subsequent substantially full-fill state of the reservoir, and determine an analyte concentration in the sample from the at least one analytic output signal value and the adjusting of the reference correlation; and a display communicatively coupled to the processor for displaying an error signal when there is an insufficient volume of sample, the display further displaying a numerical reading indicative of the analyte concentration in the sample.
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18. A biosensor system for determining an analyte concentration in a sample, the biosensor system comprising:
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a test sensor having a sample interface and a reservoir, the sample interface being in electrical communication with the reservoir, the test sensor further having a counter electrode and a working electrode positioned in the reservoir, the sample interface having conductors connected to the counter electrode and the working electrode; a biosensor measurement device having a sensor interface and a storage medium, the storage medium storing the reference correlation, the reference correlation being pre-determined with a reference instrument, a processor being located in the biosensor measurement device such that the processor is connected to the sensor interface and in electrical communication with the storage medium, the processor being communicatively coupled to the sample interface and programmed to; apply a potential across the working electrode and the counter electrode, based on the applied potential, determine an initial fill state of the test sensor to be an initial underfill state in which an insufficient volume of sample is present in the reservoir, signal for adding sample in the reservoir until the test sensor has a sufficient volume of sample, the sufficient volume of sample changing the initial underfill state of the test sensor to a subsequent substantially full-fill state, apply an analytic test excitation signal to the sufficient volume of sample, generate at least one analytic output signal value responsive to the concentration of the analyte in the sufficient volume of sample and the analytic test excitation signal, compensate for underfill error in the at least one analytic output signal value in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, wherein the compensating for the underfill error includes; adjust at least one reference correlation with a compensation system, the compensation system including at least one index function previously determined from an error parameter, wherein the compensation system applies one or more compensation equations in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, and determine an analyte concentration in the sample from the at least one analytic output signal value and the adjusting of the reference correlation; and a display communicatively coupled to the processor for displaying an error signal when there is an insufficient volume of sample, the display further displaying a numerical reading indicative of the analyte concentration in the sample.
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Specification