US 11,850,433 B2
Method and apparatus for establishing parameters for cardiac event detection
Vincent E. Splett, Apple Valley, 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. 16/703,320.
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 2020/0179708 A1, Jun. 11, 2020
Int. Cl. A61N 1/37 (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)] 31 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 comprising a plurality of axes, each axis of the plurality of axes being configured to produce an axis signal; and
a control circuit coupled to the motion sensor, the sensing circuit and the pulse generator and configured to:
select from the axis signals of the motion sensor a plurality of vector signals, each vector signal of the plurality of vector signals comprising at least one of the axis signals from the motion sensor;
identify a plurality of ventricular events;
following each of the plurality of ventricular events, set a sensing window;
for each vector signal of the plurality of vector signals, determine a maximum amplitude of the vector signal during each of a plurality of the sensing windows;
select an atrial event sensing vector signal from among the plurality of vector signals based on the determined maximum amplitudes;
sense an atrial event from the selected atrial event sensing vector signal; and
produce an atrial sensed event signal in response to the sensed atrial event.