USE OF ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (EIS) IN GROSS FAILURE ANALYSIS

摘要

Electrochemical Impedance Spectroscopy (EIS) is used in conjunction with continuous glucose monitors and continuous glucose monitoring (CGM) to enable in-vivo sensor calibration, gross (sensor) failure analysis, and intelligent sensor diagnostics and fault detection. An equivalent circuit model is defined, and circuit elements are used to characterize sensor behavior.

主权项

1. A method of performing diagnostics on a subcutaneous or implanted sensor having at least one working electrode, comprising:
defining a vector containing values associated with one or more electrochemical impedance spectroscopy (EIS)-based parameters and values associated with one or more non-EIS-based parameters; defining a respective threshold value for each of said EIS-based parameters and each of said non-EIS-based parameters; performing a first EIS procedure to generate a first set of data for said values associated with the one or more EIS-based parameters; after a calculated time interval, performing a second EIS procedure to generate a second set of data for said values associated with the one or more EIS-based parameters; updating the vector with said first and second sets of data; and monitoring said vector values to determine whether the sensor has lost sensitivity.