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Method and system for detecting age, hydration, and functional states of sensors using electrochemical impedance spectroscopy

  • US 7,985,330 B2
  • Filed: 12/29/2006
  • Issued: 07/26/2011
  • Est. Priority Date: 12/30/2005
  • Status: Active Grant
First Claim
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1. A method of using a sensor placed within a subcutaneous insertion site, comprising:

  • (a) connecting a sensor having at least two electrodes to sensor electronics;

    (b) initiating a stabilization procedure for the sensor via the sensor electronics, the stabilization procedure performing a plurality of anodic-cathodic cycles between the plurality of electrodes;

    (c) verifying if a hydration time threshold has elapsed if the sensor is not operating within specified parameters;

    (d) initiating a hydration assist procedure, the hydration assist procedure transmitting a signal for the sensor electronics to apply voltage pulses to the sensor;

    (e) generating sensor signals when the sensor is within the operational window;

    (f) performing an EIS procedure between the electrodes, the EIS procedure includes using a glucose oxidase enzyme to catalyze a reaction between the electrodes;

    (g) calculating an impedance value between the electrodes; and

    (h) comparing the impedance value against a threshold to determine if the sensor has aged beyond the specified sensor life.

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