Implantable cardioverter

Details Implantable cardioverter Implantable cardioverter

A - Human Necessities

61

N

326/1.6

A61N 1/36 (2006.01) A61N 1/38 (2006.01) A61N 1/39 (2006.01)

Patent

CA 1160296

ABSTRACT A body implantable ventricular cardioverter. Circuitry is provided which detects the onset of a malignant ventricular tachyarrhythmia and pro- vides a cardioverting signal in response thereto. The cardioverting signal has an energy level that is high relative to the pacing threshold but below that necessary for defibrillation. In this manner, a ventricular tachyar- rhythmia can be cardioverted before the onset of fibrillation and at a lower energy than required for defibrillation. Dependent on such factors as patient thresholds, the tissue/electrode interface and the electrode system employed, the energy level of the cardioverting signal is from 5 millijoules to 15 joules. The system can be configured such that increasingly malignant tachyarrhthmias result in higher energy cardioverting signals, including signals capable of defibrillation. Successful cardioversion with a signal having an energy level lower than necessary for defibrillation reduces the physical damage to thc heart as well as the trauma to and discomfort of the patient.

356555

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