US 11,918,367 B2
Cardiac signal QT interval detection
Gautham Rajagopal, Minneapolis, MN (US); and Shantanu Sarkar, Roseville, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Feb. 6, 2023, as Appl. No. 18/164,759.
Application 18/164,759 is a continuation of application No. 17/208,510, filed on Mar. 22, 2021, granted, now 11,576,606.
Claims priority of provisional application 63/004,017, filed on Apr. 2, 2020.
Prior Publication US 2023/0181083 A1, Jun. 15, 2023
Int. Cl. A61B 5/352 (2021.01); A61B 5/00 (2006.01); A61B 5/355 (2021.01); A61B 5/36 (2021.01)
CPC A61B 5/352 (2021.01) [A61B 5/355 (2021.01); A61B 5/36 (2021.01); A61B 5/7203 (2013.01); A61B 2560/02 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An insertable cardiac monitoring device, the device comprising:
a housing configured to be subcutaneously inserted into a patient, the housing comprising a cover;
a plurality of electrodes, at least one of the plurality of electrodes being disposed on a proximal portion of the cover and at least another one of the plurality of electrodes being disposed on a distal portion of the cover;
sensing circuitry configured to sense a cardiac signal based on electrical activity of a heart of the patient via the plurality of electrodes; and
processing circuitry configured to:
determine an R-wave of the cardiac signal;
determine one or more RR intervals, wherein the one or more RR intervals comprise a previous RR interval associated with the determined R-wave and a current RR interval associated with the determined R-wave;
determine a search window for a T-wave of the cardiac signal based on the one or more RR intervals of the cardiac signal;
determine the T-wave in the search window;
determine at least one of a QT interval or a QTc interval based on the determined T-wave and the determined R-wave; and
at least one of predict or detect an abnormal cardiac rhythm based at least in part on the at least one of the QT interval or the corrected QT interval.