SYSTEM AND METHOD FOR DETERMINING AN ABUSED SENSOR DURING ANALYTE MEASUREMENT
First Claim
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1. A method for detecting an abused sensor adapted for determining a concentration of a medically significant component of a biological fluid, comprising the steps of:
- a) applying a signal having an AC component to the sensor;
b) measuring an AC response to the signal; and
c) using the AC response to determine if the sensor is abused.
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Accused Products
Abstract
A method of measuring an analyte in a biological fluid comprises applying an excitation signal having a DC component and an AC component. The AC and DC responses are measured; a corrected DC response is determined using the AC response; and a concentration of the analyte is determined based upon the corrected DC response. Other methods and devices are disclosed.
60 Citations
23 Claims
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1. A method for detecting an abused sensor adapted for determining a concentration of a medically significant component of a biological fluid, comprising the steps of:
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a) applying a signal having an AC component to the sensor; b) measuring an AC response to the signal; and c) using the AC response to determine if the sensor is abused. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detecting an abused sensor for determining a concentration of a medically significant component of a biological fluid placed upon the sensor, comprising the steps of:
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a) placing the biological fluid sample upon the sensor; b) applying a first signal to the biological fluid; c) measuring a current response to the first signal; d) repeating step (c) at least once; e) calculating a normalized Cottrell Failsafe Ratio using the current response data; f) applying a second signal having an AC component to the biological fluid; g) measuring an AC response to the second signal; and h) combining the normalized Cottrell Failsafe Ratio and the AC response to produce an indication of whether the sensor has been abused. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of determining a failure condition indicating an abused sensor in a blood glucose concentration test, comprising the steps of:
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a) applying a first test signal having an AC component to a test sample; b) measuring a first phase angle response to the first test signal; c) applying a second test signal having an AC component to the test sample; d) measuring a second phase angle response to the second test signal; and e) determining a failure condition value based upon the first phase angle response the second phase angle response and a predetermined Cottrell Failsafe Ratio. - View Dependent Claims (19)
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20. A method for detecting an abused sensor adapted for determining a concentration of a medically significant component of a biological fluid, the sensor comprising a reagent layer, the method comprising the steps of:
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a) applying a signal having an AC component to the sensor; b) measuring an AC response to the signal; and c) using the AC response to determine if the reagent layer of the sensor is abused.
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21. A method for detecting an abused sensor adapted for determining a concentration of a medically significant component of a biological fluid, the sensor comprising a reagent layer, the method comprising the steps of:
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a) applying a signal having an AC component across the reagent layer on the sensor; b) measuring an AC response to the signal; and c) using the AC response to determine if the reagent layer of the sensor is abused.
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22. A method for detecting an abused sensor adapted for determining a concentration of a medically significant component of a biological fluid, comprising the steps of:
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d) applying a signal having an AC component to the sensor; e) measuring an AC response to the signal; and f) using the AC response to determine if the sensor has been mis-dosed, has been previously used, or has degraded enzymes.
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23. A method for detecting an abused sensor adapted for determining a concentration of a medically significant component of a biological fluid, comprising the steps of:
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g) applying a signal having an AC component to the sensor; h) measuring an AC response to the signal; and i) using the AC response to conduct a test that is operative to determine if the sensor has been mis-dosed, has been previously used, or has degraded enzymes.
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Specification