Biphasic pulse generator for an implantable defibrillator

Details Biphasic pulse generator for an implantable defibrillator Biphasic pulse generator for an implantable defibrillator

1988-01-12

1989-07-25

Jaworski, Francis

Surgery

Truss

Pad

A61N 100

Patent

active

048503576

ABSTRACT:
A circuit for generating a biphasic voltage pulse to restore rhythm to a fibrillating heart, the circuit utilizing a capacitor for providing the voltage pulse. The circuit further comprises first and second thyristors to regulate the voltage and first and second electrodes to apply the regulated voltage to the fibrillating heart. The circuit further comprises an output sensing circuit that senses the exponential decay of the capacitor and signals a control circuit to switch the thyristors such that after one thyristor applies the voltage pulse to the heart in a first polarity, the other thyristor applies the voltage pulse in the opposite polarity. Therefore, substantially all energy in the capacitor is provided to the heart.

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patent: 4637397 (1987-01-01), Bach, Jr.
Dahlback, O. et al., "Venticular Defibrillation with Square-Waves", Letters to the Editor, The Lancet, vol. 2, pp. 50-51, Jul. 2, 1966.
Schuder, John C. et al., "Transthoracic Ventricular Defibrillation with Square-Wave Stimuli: One-Half Cycle, One Cycle, and Multi-Cycle Waveforms", Circulation Research, vol. NV, pp. 258-264, Sep. 1964.
Jones, Janice L. et al., "Decreased Defilbrillator-Induced Dysfunction with Biphasic Rectangular Waveforms", Am. J. Physiology, 247 (5 Pt. 2), pp. H792-796, Nov. 1984.

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