Atrial tracking in an intracardiac ventricular pacemaker
First Claim
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1. An intracardiac ventricular pacemaker, comprising:
- a pulse generator configured to generate and deliver pacing pulses to a ventricle of a patient'"'"'s heart via electrodes coupled to the pacemaker;
a motion sensor configured to produce a motion signal comprising an atrial systolic event and a ventricular diastolic event indicating a passive ventricular filling phase; and
a control circuit coupled to the motion sensor and the pulse generator and configured to;
set an atrial systolic event detection threshold to a first amplitude corresponding to a first amount of motion during an expected time interval of the ventricular diastolic event and to a second amplitude that corresponds to a second amount of motion and that is lower than the first amplitude after the expected time interval of the ventricular diastolic event;
detect the atrial systolic event in response to the motion signal crossing the atrial systolic event detection threshold;
set an atrioventricular pacing interval in response to detecting the atrial systolic event; and
control the pulse generator to deliver a pacing pulse to the ventricle in response to the atrioventricular pacing interval expiring.
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Abstract
An intracardiac ventricular pacemaker having a motion sensor is configured to produce a motion signal including an atrial systolic event and a ventricular diastolic event indicating a passive ventricular filling phase, set a detection threshold to a first amplitude during an expected time interval of the ventricular diastolic event and to a second amplitude lower than the first amplitude after an expected time interval of the ventricular diastolic event. The pacemaker is configured to detect the atrial systolic event in response to the motion signal crossing the detection threshold and set an atrioventricular pacing interval in response to detecting the atrial systolic event.
56 Citations
11 Claims
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1. An intracardiac ventricular pacemaker, comprising:
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a pulse generator configured to generate and deliver pacing pulses to a ventricle of a patient'"'"'s heart via electrodes coupled to the pacemaker; a motion sensor configured to produce a motion signal comprising an atrial systolic event and a ventricular diastolic event indicating a passive ventricular filling phase; and a control circuit coupled to the motion sensor and the pulse generator and configured to; set an atrial systolic event detection threshold to a first amplitude corresponding to a first amount of motion during an expected time interval of the ventricular diastolic event and to a second amplitude that corresponds to a second amount of motion and that is lower than the first amplitude after the expected time interval of the ventricular diastolic event; detect the atrial systolic event in response to the motion signal crossing the atrial systolic event detection threshold; set an atrioventricular pacing interval in response to detecting the atrial systolic event; and control the pulse generator to deliver a pacing pulse to the ventricle in response to the atrioventricular pacing interval expiring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification