System configuration for combined defibrillator/pacemaker

Details System configuration for combined defibrillator/pacemaker System configuration for combined defibrillator/pacemaker

1990-10-22

1992-05-12

Kamm, William E.

Surgery

Truss

Pad

128419D, A61N 1362

Patent

active

051118165

ABSTRACT:
The present invention is directed to various features of an implantable combined defibrillation/pacemaker system. The system's defibrillation delivery circuit provides for delivery of a multi-phase defibrillation waveform. It also includes features for insuring low patient current leakage. Protection circuitry is provided for protecting the pacing circuitry from damage by the high voltage defibrillation output. The dual channel cardiac pacing circuit accommodates bipolar and pseudo-unipolar pacing. The system includes the ability to detect defibrillator lead breaks without delivering a defibrillation pulse to the patient. An additional advantage of the disclosed system is its ability to use the pacing output stage for extremely high rate pacing to induce ventricular fibrillation.

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Winkle et al., "Improved Low Energy Defibrillation Efficacy in Man with the Use of a Biphasic Truncated Exponential Waveform", American Heart Journal, (Jan. 1989), pp. 122-127.
Goodenough, Frank, "MOS-Controlled Thyristor Turn Off 1MW in 2 .mu.S", Electronic Design, Nov. 10, 1989, pp. 57-60.
Schuder et al., "Is the Effectiveness of Cardiac Ventricular Defibrillation Dependent Upon Polarity?", Medical Instrumentation, vol. 21, No. 5, (1987) pp. 262-265.

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