Method and system for remedying sensor malfunctions detected by electrochemical impedance spectroscopy
First Claim
Patent Images
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system that enables a user to maintain a sensor in real time. The present invention involves performing a diagnostic Electrochemical Impedance Spectroscopy (EIS) procedure to measure sensor impedance value in order to determine if the sensor is operating at an optimal level. If the sensor is not operating at an optimal level, the present invention may further involve performing a sensor remedial action. The sensor remedial action involves reversing the DC voltage being applied between the working electrode and the reference electrode. The reversed DC voltage may be coupled with an AC voltage to extend its reach.
512 Citations
20 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system to maintain an implantable sensor in real time, comprising:
-
a means for performing a diagnostic EIS procedure during the life of a sensor to derive sensor impedance values; and a sensor implanted into subcutaneous tissue, the sensor having an electrode configuration to generate sensor signals as a result of performing a plurality of diagnostic EIS procedures during the life of the sensor; electronic circuitry to determine whether the sensor is operating normally by comparing the sensor impedance values to a preset boundary having an upper and a lower threshold value, wherein the plurality of EIS procedures utilize a set DC bias and an AC voltage of varying frequencies are added to the DC bias to create a perturbation signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification