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System and method for determining an abused sensor during analyte measurement

  • US 7,977,112 B2
  • Filed: 12/09/2008
  • Issued: 07/12/2011
  • Est. Priority Date: 06/20/2003
  • Status: Expired due to Term
First Claim
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1. 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:

  • 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.

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