System error compensation of analyte concentration determinations
First Claim
1. A method of operating a biosensor system for determining an analyte concentration in a sample, the method comprising:
- providing a biosensor system in the form of an analytical instrument includinga measurement device having electrical circuitry communicatively coupled to a processor, a storage medium, a signal generator, and a sensor interface, the processor having instructions and data stored in the storage medium, anda test sensor having a base and a sample interface, the base forming a reservoir and a channel with an opening, the reservoir being in electrical or optical communication with the measurement device;
receiving a biological fluid sample in the opening of the reservoir, the biological fluid sample flowing through the channel to fill at least in part the reservoir of the test sensor, the biological fluid sample including the analyte;
in response to receiving the biological fluid sample in the reservoir, generating an input signal, by the processor, from the signal generator;
transmitting the input signal by the sensor interface to the sample interface for applying the input signal to the biological fluid sample;
in response to the input signal and a concentration of an analyte in the biological fluid sample, generating and measuring, by the processor, at least one analyte responsive output signal from the test sensor, the at least one analyte responsive output signal being one or more of an electrical output signal generated by a redox reaction or a light-generated output signal in response to a light-identifiable species;
determining, by the processor, a pseudo-reference concentration value from the at least one analyte responsive output signal, the pseudo-reference concentration value being a substitute for true relative error;
determining, by the processor, at least one anchor parameter in response to the pseudo-reference concentration value, the at least one anchor parameter compensating for system error and being determined by subtracting the pseudo-reference concentration value from an initial analyte concentration determined with the measurement device, and then, dividing by the pseudo-reference concentration value;
incorporating, by the processor, the at least one anchor parameter into a compensation relationship;
determining, by the processor, a final compensated analyte concentration of the biological fluid sample in response to the compensation relationship; and
outputting, by the processor, the final compensated analyte concentration to one or more of a display, a remote receiver, or a storage medium.
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Accused Products
Abstract
During analyte analysis, errors may be introduced into an analysis by both the biosensor system used to perform the analysis and by errors in the output signal measured by the measurement device of the biosensor. For a reference sample, system error may be determined through the determination of relative error. However, during an analysis of a test sample with the measurement device of the biosensor system, true relative error cannot be known. A pseudo-reference concentration determined during the analysis may be used as a substitute for true relative error. The present invention introduces the determination of a pseudo-reference concentration determined during the analysis as a substitute for the true relative error and uses an anchor parameter to compensate for the system error in the analysis-determined pseudo-reference concentration.
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Citations
15 Claims
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1. A method of operating a biosensor system for determining an analyte concentration in a sample, the method comprising:
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providing a biosensor system in the form of an analytical instrument including a measurement device having electrical circuitry communicatively coupled to a processor, a storage medium, a signal generator, and a sensor interface, the processor having instructions and data stored in the storage medium, and a test sensor having a base and a sample interface, the base forming a reservoir and a channel with an opening, the reservoir being in electrical or optical communication with the measurement device; receiving a biological fluid sample in the opening of the reservoir, the biological fluid sample flowing through the channel to fill at least in part the reservoir of the test sensor, the biological fluid sample including the analyte; in response to receiving the biological fluid sample in the reservoir, generating an input signal, by the processor, from the signal generator; transmitting the input signal by the sensor interface to the sample interface for applying the input signal to the biological fluid sample; in response to the input signal and a concentration of an analyte in the biological fluid sample, generating and measuring, by the processor, at least one analyte responsive output signal from the test sensor, the at least one analyte responsive output signal being one or more of an electrical output signal generated by a redox reaction or a light-generated output signal in response to a light-identifiable species; determining, by the processor, a pseudo-reference concentration value from the at least one analyte responsive output signal, the pseudo-reference concentration value being a substitute for true relative error; determining, by the processor, at least one anchor parameter in response to the pseudo-reference concentration value, the at least one anchor parameter compensating for system error and being determined by subtracting the pseudo-reference concentration value from an initial analyte concentration determined with the measurement device, and then, dividing by the pseudo-reference concentration value; incorporating, by the processor, the at least one anchor parameter into a compensation relationship; determining, by the processor, a final compensated analyte concentration of the biological fluid sample in response to the compensation relationship; and outputting, by the processor, the final compensated analyte concentration to one or more of a display, a remote receiver, or a storage medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A biosensor system for determining an analyte concentration in a biological fluid sample, the biosensor system being an optical system or an electrochemical system, the biosensor system comprising:
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a test sensor having a base and a sample interface, the base forming a reservoir and a channel with an opening, the opening being configured to receive a biological fluid sample and to allow the biological fluid sample to flow through the channel to fill at least in part the reservoir; a measurement device in electrical or optical communication with the reservoir, the measurement device having electrical circuitry communicatively coupled to a processor, a storage medium, a signal generator, and a sensor interface, the processor having instructions and data stored in the storage medium, the instructions configured such that when executed by the processor the system is enabled so that; in response to receiving the biological fluid sample in the reservoir, the signal generator applies an electrical or optical input signal to the sensor interface, the input signal is transmitted by the sensor interface to the sample interface for applying the input signal to the biological fluid sample, in response to the input signal and to the concentration of the analyte in the biological fluid sample, the processor generates and measures at least one analyte responsive output signal, the output signal being one or more of a light-generated output signal in response to a light-identifiable species and an electrical output signal generated by a redox reaction, where the processor is capable of measuring at least one analyte responsive output signal, the processor determines a pseudo-reference concentration value from the at least one analyte responsive output signal, where a pseudo-reference concentration value is a substitute for true relative error, the processor determines at least one anchor parameter in response to the pseudo-reference concentration value, the at least one anchor parameter compensating for system error and being determined by subtracting the pseudo-reference concentration value from an initial analyte concentration determined with the measurement device, and then, dividing by the pseudo-reference concentration value, the processor incorporates the at least one anchor parameter into a compensation relationship, the processor determines a final compensated analyte concentration of the biological fluid sample in response to the compensation relationship, and the processor outputs the final compensated analyte concentration to one or more of a display, a remote receiver, or a storage medium. - View Dependent Claims (12, 13, 14, 15)
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Specification