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Method and system for remedying sensor malfunctions detected by electrochemical impedance spectroscopy

  • US 8,114,268 B2
  • Filed: 08/21/2007
  • Issued: 02/14/2012
  • Est. Priority Date: 12/30/2005
  • Status: Active Grant
First Claim
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1. A method of maintaining a sensor in real time, comprising:

  • inserting a sensor into subcutaneous tissue;

    hydrating the sensor with interstitial fluid for a hydration period;

    verifying the sensor is properly hydrated by performing a first diagnostic Electrochemical Impedance Spectroscopy (EIS) procedure during the hydration period;

    prolonging the hydration period if the first diagnostic EIS procedure indicates insufficient hydration, or initiating sensor power up if the first diagnostic EIS procedure indicates sufficient hydration; and

    determining whether the sensor is operating normally by comparing sensor impedance values to a preset boundary having an upper and a lower threshold value,wherein the first diagnostic EIS procedure utilizes a set DC bias and an AC voltage of varying frequencies are added to the DC bias to create a perturbation signal.

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