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Method for detecting a malfunction of a sensor for measuring an analyte concentration in vivo

  • US 10,111,609 B2
  • Filed: 11/30/2015
  • Issued: 10/30/2018
  • Est. Priority Date: 10/05/2009
  • Status: Active Grant
First Claim
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1. A method for detecting a malfunction of a sensor for measuring an analyte concentration in vivo, comprising:

  • producing a series of measuring signals, by means of the sensor;

    determining successively a value of a noise parameter from the measuring signals, the noise parameter indicating how severely the measurement is impaired by interference signals;

    determining the rate of change of the values of the noise parameter by calculating a time derivative of the noise parameter, wherein the rate of change of the noise parameter is determined on a smoothened series of values of the noise parameter; and

    analyzing the rate of change of the noise parameter in order to detect a malfunction,wherein in calculating the value of the noise parameter it is determined which portion of a measuring value is based on the interference signals such that a given measuring value is the sum of a useful signal that corresponds to the analyte concentration and the interference signal, andwherein a recursive filter is used to separate a noise portion from the useful portion of the measurement signal.

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