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US 6,584,350 B2Granted
Apparatus and method for R-wave detection with dual dynamic sensitivities
AssigneeCardiac Pacemakers, Inc.
InventorsJaeho Kim, Joseph M. Bocek
Life of this patent
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Abstract
An apparatus and method for delivering electrical shock therapy in order to treat atrial tachyarrhythmias such as fibrillation utilizes a dynamically varying threshold to detect R-waves and synchronously deliver a defibrillation shock.
Claims16
A method for delivering atrial defibrillation therapy, comprising:
- detecting an episode of atrial fibrillation or other atrial tachyarrhythmia;
- detecting ventricular depolarizations (R-waves) with a ventricular sensing channel, wherein R-waves are detected when a sensed ventricular electrogram value exceeds a dynamically varying threshold value;
- detecting separate events in the ventricular sensing channel with a specified low shock threshold value and a specified high shock threshold value;
- and,
- delivering an atrial defibrillation shock pulse synchronously with a detected R-wave when the dynamically varying threshold detects an event, the interval from the last event detected by the low shock threshold to the event presently detected by the low shock threshold or the dynamically varying threshold is greater than a specified minimum shockable time interval, and the high shock threshold also detects an event within a specified maximum time interval from the event detected by the low shock threshold or the dynamically varying threshold.
2 more elements
An apparatus for delivering atrial defibrillation therapy, comprising:
- an atrial sensing channel for detecting atrial depolarizations (P waves);
- and;
- a ventricular sensing channel for detecting ventricular depolarizations (R-waves);
- a shock pulse generator for generating atrial defibrillation shock pulses;
- a controller for controlling the operation of the device, wherein the controller is programmed to detect R-waves when a sensed ventricular electrogram value exceeds a dynamically varying threshold value and to detect separate events in the ventricular sensing channel with a specified low shock threshold value and a specified high shock threshold value;
- and,
- wherein the controller is programmed to detect episodes of atrial fibrillation or other atrial tachyarrhythmias from detected P waves, and, upon detection of an atrial tachyarrythmia, to deliver an atrial defibrillation shock pulse synchronously with a detected R-wave when the dynamically varying threshold detects an event, the interval from the last event detected by the low shock threshold to the event presently detected by the low shock threshold or the dynamically varying threshold is greater than a specified minimum shockable time interval, and the high shock threshold also detects an event within a specified maximum time interval from the event detected by the low shock threshold or the dynamically varying threshold.
4 more elements
Dependencies are inferred from the claim text.