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US 7,248,922 B2Granted
Timing refractory period for cardiac resynchronization pacing
AssigneeCardiac Pacemakers, Inc.
InventorKenneth L. Baker
Life of this patent
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Abstract
A device and method for cardiac rhythm management in which a heart chamber is paced in accordance with a pacing mode that employs sense signals from the opposite chamber. A sensing refractory period is provided in order to prevent the pacing interval from being lengthened due to delays in conduction of excitation from the paced chamber to the sensed chamber.
Claims20
A method for operating a cardiac rhythm management device, comprising:
- sensing a heart chamber designated as the rate chamber and generating sense signals upon detection of depolarization occurring in the rate chamber;
- pacing a heart chamber contralateral to rate chamber, designated as the synchronized chamber, with an escape interval that is reset by either a synchronized chamber pace or a rate chamber sense;
- rendering the rate chamber sensing channel refractory for a selected timing refractory period upon delivery of a synchronized chamber pace during which rate chamber senses are ignored for purposes of resetting the escape interval but counted for purposes of tachyarrhythmia detection.
A cardiac rhythm management device, comprising:
- a sensing channel for sensing depolarizations from a heart chamber designated as the rate chamber;
- a pacing channel for delivering paces to a heart chamber contralateral to the rate chamber, designated as the synchronized chamber;
- a controller programmed to pace the synchronized chamber with an escape interval that is reset by either a synchronized chamber pace or a rate chamber sense;
- and,
- wherein the controller is programmed to detect tachyarrhythmias by measuring the intervals between rate chamber senses and to render the rate chamber sensing channel refractory for a selected timing refractory period upon delivery of a synchronized chamber pace during which rate chamber senses are ignored for purposes of resetting the escape interval but counted for purposes of tachyarrhythmia detection.
2 more elements
Dependencies are inferred from the claim text.