Implantable defibrillator with fibrillation-inducing capability

Details Implantable defibrillator with fibrillation-inducing capability Implantable defibrillator with fibrillation-inducing capability

1992-03-31

1994-01-18

Jaworski, Francis

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 2, A61N 100

Patent

active

052792935

ABSTRACT:
An implantable defibrillator has a capacitor which, through a controllable switch arrangement, can either be connected to a voltage source for charging the capacitor, or connected across electrodes placed at the heart for delivering a defibrillation pulse. To calculate the minimum pulse energy required for successful defibrillation, ventricular fibrillation is first induced, so that a plurality of defibrillation attempts, with energy increasing from attempt-to-attempt can be undertaken until successful defibrillation occurs. For inducing ventricular fibrillation, the capacitor of the implantable defibrillator is connected to the voltage source until a prescribed charging voltage, which is significantly below the voltage necessary for defibrillation, is reached, and subsequently, the capacitor is disconnected from the voltage source during brief time spans at intervals within the framework of a sequence and is connected during those time spans to the electrodes. Between the time spans, the capacitor is again charged.

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Starmer et al., "Current Density and Electrically Induced Fibrillation," Medical Instrumentation, vol. 7, No. 1, Jan.-Feb. 1973.
Levy et al., "Cardiac Fibrillation-Defibrillation: Use of Electrical Current in Conversion of Cardiac Rhythm-Methods and Results", Am. Journal of Med. Elec. Oct.-Dec. '64.
"Ventricular Fibrillation Threshold in the Dog Determined with Defibrillating Paddles," Ruiz et al., Med. & Biol. Eng. & Comput., May 1985, pp. 281-284.

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