Incon-trol Corp.

Cardiac Pacemakers, Inc.

Gena K Sears

Jerry C Griffin

An implantable defibrillation system includes a lead system for making electrical contact with a heart, an atrial cardiovertor coupled to the lead system for applying cardioverting electrical energy to that is of the heart, and a ventricular defibrillator coupled to the lead system. The ventricular defibrillator includes a ventricular arrhythmia detector responsive to a control signal for detecting for a ventricular arrhythmia of the heart and a ventricular cardiovertor for cardioverting the ventricles of the heart in response to the ventricular arrhythmia detector detecting a ventricular arrhythmia. A ventricular arrhythmia detector enable stage provides the control signal in response to each application of cardioverting electrical energy to the atria by the atrial cardiovertor.

Defibrillation system including an atrial defibrillator and ventricular

An implantable atrial defibrillator delays therapy intervention for a delay time period after initial detection of fibrillation to provide the atria with an opportunity to spontaneously revert to normal sinus rhythm before cardioversion is attempted. A timer times the delay time period responsive to the first initial detection of fibrillation by a fibrillation detector. After timer time-out, the fibrillation detector redetects for atrial fibrillation. If the atria are still in fibrillation, a cardiovertor cardioverts the atria. If the atria are not in fibrillation, cardioverting therapy is withheld.

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Seattle, WA, United States of America

Gena K Sears