Biphasic pulse generator for an implantable defibrillator
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
Jan 12, 1988
filing date -
Jan 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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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