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 at least one ventricular diastolic event; and
a control circuit coupled to the motion sensor and the pulse generator and configured to;
set an atrial refractory period;
determine a ventricular diastolic event metric from the motion signal;
compare the ventricular diastolic event metric to change criteria to detect a change in the ventricular diastolic event metric compared to at least one previously determined ventricular diastolic event metric;
adjust the atrial refractory period in response to detecting the change;
detect the atrial systolic event from the motion signal;
set an atrioventricular pacing interval in response to detecting the atrial systolic event after an expiration of the atrial refractory period; and
control the pulse generator to deliver a pacing pulse to a ventricle of the patient'"'"'s heart 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 at least one ventricular diastolic event. The pacemaker is configured to set an atrial refractory period, detect a change in a ventricular diastolic event metric and adjust the atrial refractory period in response to detecting the change. The pacemaker sets set an atrioventricular pacing interval in response to detecting the atrial systolic event from the motion signal after expiration of the atrial refractory period.
72 Citations
29 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 at least one ventricular diastolic event; and a control circuit coupled to the motion sensor and the pulse generator and configured to; set an atrial refractory period; determine a ventricular diastolic event metric from the motion signal; compare the ventricular diastolic event metric to change criteria to detect a change in the ventricular diastolic event metric compared to at least one previously determined ventricular diastolic event metric; adjust the atrial refractory period in response to detecting the change; detect the atrial systolic event from the motion signal; set an atrioventricular pacing interval in response to detecting the atrial systolic event after an expiration of the atrial refractory period; and control the pulse generator to deliver a pacing pulse to a ventricle of the patient'"'"'s heart in response to the atrioventricular pacing interval expiring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method performed by an intracardiac ventricular pacemaker having a motion sensor, comprising:
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producing by the motion sensor a motion signal comprising an atrial systolic event and at least one ventricular diastolic event; setting by a control circuit of the pacemaker an atrial refractory period; determining by the control circuit a ventricular diastolic event metric from the motion signal; comparing the ventricular diastolic event metric to change criteria to detect a change in the ventricular diastolic event metric compared to at least one previously determined ventricular diastolic event metric; adjusting the atrial refractory period in response to detecting the change; detecting the atrial systolic event from the motion signal; setting an atrioventricular pacing interval in response to detecting the atrial systolic event after an expiration of the atrial refractory period; and delivering a pacing pulse to a ventricle of the patient'"'"'s heart via electrodes coupled to the pacemaker in response to the atrioventricular pacing interval expiring. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A non-transitory computer-readable medium storing a set of instructions which when executed by a control circuit of an intracardiac ventricular pacemaker having a motion sensor, cause the pacemaker to:
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produce by the motion sensor a motion signal comprising an atrial systolic event and at least one ventricular diastolic event; set an atrial refractory period; determine a ventricular diastolic event metric; compare the ventricular diastolic event metric to change criteria to detect a change in the ventricular diastolic event metric compared to at least one previously determined ventricular diastolic event metric; adjust the atrial refractory period in response to detecting the change; detect the atrial systolic event from the motion signal; set an atrioventricular pacing interval in response to detecting the atrial systolic event after an expiration of the atrial refractory period; and deliver a pacing pulse to a ventricle of the patient'"'"'s heart via electrodes coupled to the pacemaker in response to the atrioventricular pacing interval expiring.
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Specification