Method for detecting a malfunction of a sensor for measuring an analyte concentration in vivo
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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Abstract
The invention relates to a method for detecting a malfunction of a sensor for measuring an analyte concentration in vivo, wherein a series of measurement signals is produced by means of the sensor, and a value of a noise parameter is continually determined from the measuring signals, the noise parameter indicating how severely the measurement is impaired by interference signals. According to the invention, continually determined values of the noise parameter are used to determine how quickly the noise parameter changes, and the rate of change of the noise parameter is evaluated to detect a malfunction.
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Citations
12 Claims
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1. A method for detecting a malfunction of a sensor for measuring an analyte concentration in vivo, comprising:
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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, and wherein a recursive filter is used to separate a noise portion from the useful portion of the measurement signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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