Atrial tracking in an intracardiac ventricular pacemaker
First Claim
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1. An intracardiac ventricular pacemaker, comprising:
- a housing;
a pulse generator within the housing, the pulse generator configured to generate and deliver a pacing pulse to a ventricle of a patient'"'"'s heart via electrodes coupled to the pacemaker;
a motion sensor within the housing, the motion sensor configured to produce an electrical signal;
a control circuit within the housing comprising an atrial event detector circuit coupled to the motion sensor;
a pace timing circuit within the housing, wherein the pace timing circuit is coupled to the pulse generator; and
a flow disturbance structure on the housing,wherein the flow disturbance structure is configured to produce a vibration in response to movement of blood within the ventricle during an atrial systole,wherein the flow disturbance structure is configured to transfer the vibration to the motion sensor within the housing, andwherein the atrial event detector circuit is configured to detect an atrial mechanical event from the electrical signal of the motion sensor in response to the vibration, and pass an atrial event signal to the pace timing circuit in response to detecting the atrial mechanical event,the pace timing circuit configured to schedule the pacing pulse by starting a pacing interval in response to receiving the atrial event signal, andthe pulse generator configured to deliver the scheduled pacing pulse to a ventricle of the patient'"'"'s heart in response to the pacing interval expiring.
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Abstract
An intracardiac ventricular pacemaker is configured to detect an atrial mechanical event from a motion sensor signal received by an atrial event detector circuit of the pacemaker. The motion sensor signal is responsive the motion of blood flowing in the ventricle. A pacing pulse is scheduled at an expiration of a pacing interval set by a pace timing circuit in response to detecting the atrial mechanical event. An atrial-synchronized ventricular pacing pulse is delivered upon expiration of the pacing interval.
52 Citations
26 Claims
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1. An intracardiac ventricular pacemaker, comprising:
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a housing; a pulse generator within the housing, the pulse generator configured to generate and deliver a pacing pulse to a ventricle of a patient'"'"'s heart via electrodes coupled to the pacemaker; a motion sensor within the housing, the motion sensor configured to produce an electrical signal; a control circuit within the housing comprising an atrial event detector circuit coupled to the motion sensor; a pace timing circuit within the housing, wherein the pace timing circuit is coupled to the pulse generator; and a flow disturbance structure on the housing, wherein the flow disturbance structure is configured to produce a vibration in response to movement of blood within the ventricle during an atrial systole, wherein the flow disturbance structure is configured to transfer the vibration to the motion sensor within the housing, and wherein the atrial event detector circuit is configured to detect an atrial mechanical event from the electrical signal of the motion sensor in response to the vibration, and pass an atrial event signal to the pace timing circuit in response to detecting the atrial mechanical event, the pace timing circuit configured to schedule the pacing pulse by starting a pacing interval in response to receiving the atrial event signal, and the pulse generator configured to deliver the scheduled pacing pulse to a ventricle of the patient'"'"'s heart in response to the pacing interval expiring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An intracardiac ventricular pacemaker, comprising:
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a pulse generator configured to generate and deliver a pacing pulse to a ventricle of a patient'"'"'s heart via electrodes coupled to the pacemaker; a motion sensor configured to produce an electrical signal correlated to movement of blood within the ventricle; a control circuit comprising an atrial event detector circuit coupled to the motion sensor and a pace timing circuit coupled to the pulse generator; a housing enclosing at least the pulse generator and the control circuit and having a housing proximal end and a housing distal end; a fixation member coupled to the housing distal end for anchoring the housing at an implant site; and a flow disturbance fixture having a first end coupled to the housing proximal end and a second end extending away from the housing, the second end configured vibrate when the fixture is subjected to blood flow into the ventricle during atrial systole, the first end configured to transfer the vibrations to the motion sensor, wherein the atrial event detector circuit is configured to detect an atrial mechanical event from the motion sensor signal and pass an atrial event signal to the pace timing circuit in response to detecting the atrial mechanical event, the pace timing circuit configured to schedule the pacing pulse by starting a pacing interval in response to receiving the atrial event signal, and the pulse generator configured to deliver the scheduled pacing pulse to a ventricle of the patient'"'"'s heart in response to the pacing interval expiring. - View Dependent Claims (12, 13, 14)
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15. A method for delivering cardiac pacing by an intracardiac ventricular pacemaker, the method comprising:
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detecting an atrial mechanical event from a motion sensor signal received by an atrial event detector circuit within a housing of the pacemaker when the pacemaker is implanted in a ventricle of a patient, wherein a flow disturbance structure on the housing is configured to produce a vibration in response to movement of blood within the ventricle during an atrial systole, and wherein the flow disturbance structure is configured to transfer the vibration to the motion sensor; passing an atrial event signal from the atrial event detector circuit to a pace timing circuit within the housing of the pacemaker in response to detecting the atrial mechanical event; scheduling a pacing pulse at an expiration of a pacing interval by the pace timing circuit in response to the atrial event signal; and delivering the pacing pulse to the ventricle by a pulse generator within the housing of the pacemaker via a pair of electrodes in response to the pacing interval expiring. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. The method of 15, further comprising delivering the pacing pulse via electrodes coupled to the housing of the pacemaker.
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26. A non-transitory computer-readable medium storing a set of instructions which when executed by an intracardiac ventricular pacemaker, cause the pacemaker to:
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detect an atrial mechanical event from a motion sensor signal received by an atrial event detector circuit within a housing of the pacemaker, wherein a flow disturbance structure on the housing is configured to produce a vibration in response to movement of blood within the ventricle during an atrial systole, and wherein the flow disturbance structure is configured to transfer the vibration to the motion sensor; passing an atrial event signal from the atrial event detector circuit to a pace timing circuit within the housing of the pacemaker in response to detecting the atrial event; scheduling a pacing pulse at an expiration of a pacing interval by the pace timing circuit in response to the atrial event signal; and delivering the pacing pulse to a ventricle of the patient by a pulse generator within the housing of the pacemaker via a pair of electrodes in response to the pacing interval expiring.
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Specification