US 12,186,571 B2
Multi-threshold sensing of cardiac electrical signals in an implantable medical device
Jian Cao, Shoreview, MN (US); Gerald P. Arne, Wayzata, MN (US); Timothy A. Ebeling, Circle Pines, MN (US); Yanina Grinberg, Plymouth, MN (US); Michael W. Heinks, New Brighton, MN (US); Paul R. Solheim, Blaine, MN (US); and Xusheng Zhang, Shoreview, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Dec. 20, 2022, as Appl. No. 18/069,218.
Application 18/069,218 is a continuation of application No. 17/068,011, filed on Oct. 12, 2020, granted, now 11,547,864.
Application 17/068,011 is a continuation of application No. 15/790,255, filed on Oct. 23, 2017, granted, now 10,799,710, issued on Oct. 13, 2020.
Prior Publication US 2023/0129026 A1, Apr. 27, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61N 1/39 (2006.01); A61N 1/362 (2006.01); A61N 1/365 (2006.01); A61N 1/372 (2006.01); A61B 5/352 (2021.01); A61N 1/05 (2006.01)
CPC A61N 1/3956 (2013.01) [A61N 1/3621 (2013.01); A61N 1/3622 (2013.01); A61N 1/365 (2013.01); A61N 1/37252 (2013.01); A61B 5/352 (2021.01); A61N 1/05 (2013.01); A61N 1/3931 (2013.01); A61N 1/3943 (2013.01); A61N 1/3987 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A medical device comprising:
a therapy delivery circuit configured to deliver an electrical stimulation pulse to a patient's heart;
a control circuit configured to:
schedule a next electrical stimulation pulse to be delivered by the therapy delivery circuit at a pacing interval; and
determine a drop time interval based on the pacing interval; and
a sensing circuit configured to:
receive a cardiac electrical signal;
apply a cardiac event sensing threshold to the cardiac electrical signal by holding the cardiac event sensing threshold at a first threshold value starting after the electrical stimulation pulse until an expiration of the drop time interval determined based on the pacing interval; and
sense a cardiac event attendant to a myocardial depolarization of the patient's heart in response to the cardiac electrical signal crossing the cardiac event sensing threshold.