US 11,724,113 B2
Method and apparatus for establishing parameters for cardiac event detection
Vincent E. Splett, Apple Valley, MN (US); Keelia Doyle, Minneapolis, MN (US); Greggory R. Herr, Blaine, MN (US); Juliana E. Pronovici, New Hope, MN (US); and Todd J. Sheldon, North Oaks, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Dec. 4, 2019, as Appl. No. 16/703,047.
Claims priority of provisional application 62/776,034, filed on Dec. 6, 2018.
Claims priority of provisional application 62/776,027, filed on Dec. 6, 2018.
Prior Publication US 2020/0179707 A1, Jun. 11, 2020
Int. Cl. A61N 1/362 (2006.01); A61N 1/375 (2006.01); A61B 5/00 (2006.01); A61B 5/021 (2006.01); A61N 1/368 (2006.01); A61B 5/024 (2006.01); A61N 1/36 (2006.01)
CPC A61N 1/37512 (2017.08) [A61B 5/0006 (2013.01); A61B 5/024 (2013.01); A61B 5/02116 (2013.01); A61B 5/02125 (2013.01); A61B 5/721 (2013.01); A61B 5/7282 (2013.01); A61N 1/3682 (2013.01); A61N 1/36175 (2013.01); A61N 1/36843 (2017.08)] 39 Claims
OG exemplary drawing
 
1. A pacemaker comprising:
a pulse generator configured to generate pacing pulses;
a sensing circuit comprising an R-wave detector for sensing R-waves from a cardiac electrical signal;
a motion sensor configured to produce a motion signal comprising an atrial event signal corresponding to an atrial systolic event; and
a control circuit coupled to the motion sensor and the pulse generator and configured to:
identify a plurality of ventricular electrical events, wherein each of the plurality of ventricular electrical events is one of an R-wave sensed by the sensing circuit or a ventricular pacing pulse generated by the pulse generator;
following each of at least a portion of the plurality of ventricular electrical events, set a sensing window;
determine a feature of the motion signal during each of the sensing windows by determining a latest crossing time of a first threshold amplitude by the motion signal during each of the sensing windows;
set an atrial event sensing parameter by setting an ending time of a passive ventricular filling window based on the determined features;
sense the atrial systolic event based on the atrial event sensing parameter; and
produce an atrial sensed event signal in response to sensing the atrial systolic event.