Implantable cardioverter

Details Implantable cardioverter Implantable cardioverter

1980-12-22

1983-03-08

Kamm, William E.

Surgery

Truss

Pad

128419PG, A61N 136

Patent

active

043758177

ABSTRACT:
A body implantable ventricular cardioverter. Circuitry is provided which detects the onset of a malignant ventricular tachyarrhythmia and provides 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 tachyarrhythmia 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 tachyarrhythmias 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 the heart as well as the trauma to and discomfort of the patient.

REFERENCES:
patent: 3716059 (1973-02-01), Welborn et al.
patent: 3805795 (1974-04-01), Denniston et al.
patent: 4088140 (1978-05-01), Rockland et al.

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