Determining analyte concentrations in biological fluids with abnormal output detection
First Claim
1. A biosensor for determining an analyte concentration in a biological fluid, comprising:
- a sensor strip having a sample interface on a base, where the sample interface is adjacent to a reservoir formed by the base; and
a measuring device having a processor connected to a sensor interface, where the sensor interface has electrical communication with the sample interface;
where the processor directs a signal generator to provide a pulsed input signal to a sample of a biological fluid, the pulses of the input signal separated by relaxations where the electrical signal is off;
where the processor receives an output signal from a redox reaction of an analyte in the sample, where the output signal is responsive to the pulses of the input signal;
where the processor measures the output signal from the redox reaction of the analyte in the sample;
where the processor normalizes the output signal from the redox reaction of the analyte in the sample, where the output signal is responsive to an analyte concentration in the sample, the normalized output signal being indicative of the analyte concentration in the sample;
where the processor compares the normalized output signal from at least two of the pulses separated by relaxations to at least one control limit, where the at least one control limit represents at least one transition of the output signal from normal to abnormal;
where the processor generates an error signal when the normalized output signal is not within the at least one control limit, the error signal being indicative of an error in analysis of the analyte concentration in the sample; and
where the processor calculates a ratio of a first normalized current value from one of the pulses to a second normalized current value from another pulse.
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Accused Products
Abstract
A biosensor has an abnormal output detection system that determines whether an output signal from the redox reaction of an analyte has a normal or abnormal shape or configuration. The abnormal output detection system improves the accuracy and precision of the biosensor in determining whether an output signal has a shape or configuration that may not provide an accurate and/or precise analysis of a biological fluid. The biosensor generates an output signal in response to the redox reaction of the analyte. The biosensor normalizes the output signal and compares the normalized output signal with one or more control limits. The biosensor may generate an error signal when the normalized output signal is not within the control limits.
24 Citations
23 Claims
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1. A biosensor for determining an analyte concentration in a biological fluid, comprising:
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a sensor strip having a sample interface on a base, where the sample interface is adjacent to a reservoir formed by the base; and a measuring device having a processor connected to a sensor interface, where the sensor interface has electrical communication with the sample interface; where the processor directs a signal generator to provide a pulsed input signal to a sample of a biological fluid, the pulses of the input signal separated by relaxations where the electrical signal is off; where the processor receives an output signal from a redox reaction of an analyte in the sample, where the output signal is responsive to the pulses of the input signal; where the processor measures the output signal from the redox reaction of the analyte in the sample; where the processor normalizes the output signal from the redox reaction of the analyte in the sample, where the output signal is responsive to an analyte concentration in the sample, the normalized output signal being indicative of the analyte concentration in the sample; where the processor compares the normalized output signal from at least two of the pulses separated by relaxations to at least one control limit, where the at least one control limit represents at least one transition of the output signal from normal to abnormal; where the processor generates an error signal when the normalized output signal is not within the at least one control limit, the error signal being indicative of an error in analysis of the analyte concentration in the sample; and where the processor calculates a ratio of a first normalized current value from one of the pulses to a second normalized current value from another pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of operating a biosensor system for determining an analyte concentration in a biological fluid sample, the biosensor system including a measurement device and a test sensor, the measurement device having a processor, the measurement device being in electrical or optical communication with a reservoir of the test sensor, the method comprising:
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applying, by the processor of the measurement device, a pulsed electrical input signal to a sample of a biological fluid located in the reservoir of the test sensor, the pulses of the input signal separated by relaxations where the signal is off; generating, by the processor of the measurement device, an output signal from a redox reaction of an analyte in the sample, where the output signal is responsive to the pulses of the input signal; measuring, by the processor of the measurement device, the output signal from the redox reaction of the analyte in the sample; normalizing, by the processor of the measurement device, the output signal from the redox reaction of the analyte in the sample, where the output signal is responsive to an analyte concentration in the sample, the normalized output signal being indicative of the analyte concentration in the sample; comparing, by the processor of the measurement device, a normalized output signal from at least two of the pulses separated by relaxations to at least one control limit, where the at least one control limit represents at least one transition of the output signal from normal to abnormal; generating, by the processor of the measurement device, an error signal when the normalized output signal is not within the at least one control limit, the error signal being indicative of an error in analysis of the analyte concentration in the sample; calculating, by the processor of the measurement device, a ratio of a first normalized current value from one of the pulses to a second normalized current value from another one of the pulses; and where the analyte undergoes a redox reaction when the input signal is applied to the sample.
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Specification