US 12,419,552 B2
Application of electrochemical impedance spectroscopy in sensor systems, devices, and related methods
Jenn-Hann Larry Wang, Northridge, CA (US); Michael E. Miller, Culver City, CA (US); Raghavendhar Gautham, Northridge, CA (US); Yiwen Li, Arcadia, CA (US); and Rajiv Shah, Rancho Palos Verdes, CA (US)
Assigned to Medtronic MiniMed, Inc., Northridge (CA)
Filed by Medtronic MiniMed, Inc., Northridge, CA (US)
Filed on Dec. 9, 2021, as Appl. No. 17/546,159.
Application 17/546,159 is a continuation of application No. 16/853,461, filed on Apr. 20, 2020, granted, now 11,213,231.
Application 16/853,461 is a continuation of application No. 16/419,624, filed on May 22, 2019, granted, now 10,660,555, issued on May 26, 2020.
Application 16/419,624 is a continuation of application No. 15/818,341, filed on Nov. 20, 2017, granted, now 10,342,468, issued on Jul. 9, 2019.
Application 15/818,341 is a continuation of application No. 15/666,887, filed on Aug. 2, 2017, granted, now 9,863,911, issued on Jan. 9, 2018.
Application 15/666,887 is a continuation of application No. 15/207,064, filed on Jul. 11, 2016, abandoned.
Application 15/207,064 is a continuation of application No. 13/778,391, filed on Feb. 27, 2013, granted, now 9,408,567, issued on Aug. 9, 2016.
Claims priority of provisional application 61/755,811, filed on Jan. 23, 2013.
Claims priority of provisional application 61/754,475, filed on Jan. 18, 2013.
Claims priority of provisional application 61/754,485, filed on Jan. 18, 2013.
Claims priority of provisional application 61/754,479, filed on Jan. 18, 2013.
Claims priority of provisional application 61/754,483, filed on Jan. 18, 2013.
Claims priority of provisional application 61/657,517, filed on Jun. 8, 2012.
Prior Publication US 2022/0095965 A1, Mar. 31, 2022
Int. Cl. A61B 5/1486 (2006.01); A61B 5/00 (2006.01); A61B 5/0537 (2021.01); A61B 5/0538 (2021.01); A61B 5/145 (2006.01); A61B 5/1459 (2006.01); A61B 5/1473 (2006.01); A61B 5/1495 (2006.01); A61M 5/142 (2006.01); A61M 5/158 (2006.01); A61M 5/172 (2006.01); G01N 27/02 (2006.01); G01N 27/416 (2006.01); G01N 33/49 (2006.01); G01N 33/66 (2006.01); G01N 33/96 (2006.01); G01R 35/00 (2006.01); G08B 21/18 (2006.01)
CPC A61B 5/1495 (2013.01) [A61B 5/0537 (2013.01); A61B 5/0538 (2013.01); A61B 5/14503 (2013.01); A61B 5/14532 (2013.01); A61B 5/1459 (2013.01); A61B 5/1473 (2013.01); A61B 5/14865 (2013.01); A61B 5/4839 (2013.01); A61B 5/6849 (2013.01); A61B 5/6852 (2013.01); A61B 5/6886 (2013.01); A61B 5/7203 (2013.01); A61B 5/7221 (2013.01); A61B 5/7225 (2013.01); A61B 5/7242 (2013.01); A61B 5/746 (2013.01); A61M 5/14276 (2013.01); A61M 5/1582 (2013.01); A61M 5/1723 (2013.01); G01N 27/026 (2013.01); G01N 27/028 (2013.01); G01N 27/416 (2013.01); G01N 27/4163 (2013.01); G01N 33/49 (2013.01); G01N 33/66 (2013.01); G01N 33/96 (2013.01); G01R 35/00 (2013.01); G01R 35/005 (2013.01); G08B 21/182 (2013.01); A61B 2562/0214 (2013.01); A61B 2562/04 (2013.01); A61M 5/14244 (2013.01); A61M 2005/1726 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of performing sensor diagnostics on a subcutaneous or implanted sensor of a system, the subcutaneous or implanted sensor including at least one working electrode and the system including a microprocessor that is operatively coupled to the subcutaneous or implanted sensor and performs the sensor diagnostics, the method comprising:
periodically performing an electrochemical impedance spectroscopy (EIS) procedure to generate multiple sets of impedance-related data for the at least one working electrode, the impedance-related data comprising impedance magnitudes and phase angles;
calculating a slope of the impedance magnitudes across a frequency band of the multiple sets of impedance related data;
accessing a phase angle of the phase angles of the multiple sets of impedance related data;
detecting a pullout of the subcutaneous or implanted sensor based on at least one of: the slope of the impedance magnitudes or the phase angle; and
notifying an alert based on detecting the pullout of the subcutaneous or implanted sensor.