US 11,752,346 B2
Atrial tracking confirmation in an intracardiac ventricular pacemaker
Todd J. Sheldon, North Oaks, MN (US); Wade M. Demmer, Coon Rapids, MN (US); and Greggory R. Herr, Blaine, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Aug. 14, 2020, as Appl. No. 16/993,684.
Application 16/993,684 is a continuation of application No. 16/027,717, filed on Jul. 5, 2018, granted, now 10,744,329.
Claims priority of provisional application 62/529,609, filed on Jul. 7, 2017.
Prior Publication US 2020/0368535 A1, Nov. 26, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. A61N 1/365 (2006.01); A61N 1/375 (2006.01); A61N 1/372 (2006.01); A61N 1/368 (2006.01); A61B 5/00 (2006.01); A61B 5/11 (2006.01); A61B 5/352 (2021.01); A61N 1/05 (2006.01)
CPC A61N 1/36578 (2013.01) [A61B 5/1102 (2013.01); A61B 5/352 (2021.01); A61B 5/4836 (2013.01); A61B 5/686 (2013.01); A61B 5/7282 (2013.01); A61N 1/3682 (2013.01); A61N 1/3756 (2013.01); A61N 1/37205 (2013.01); A61N 1/0573 (2013.01); A61N 1/37217 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An implantable medical device, comprising:
a motion sensor configured to produce a motion signal;
a control circuit configured to, for each of a plurality of cardiac cycles:
set a refractory period having an expiration time after a first ventricular diastolic event signal of the motion signal and before a second ventricular diastolic event signal of the motion signal, the second ventricular diastolic event signal being a ventricular passive filling event signal;
determine that the motion signal crosses a threshold amplitude after the expiration time of the refractory period;
detect an atrial event signal in response to the motion signal crossing the threshold amplitude; and
a pulse generator configured to generate a ventricular pacing pulse in response to detecting the atrial event signal.