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 |
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.
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