Protection circuit for implantable cardioverter

Details Protection circuit for implantable cardioverter Protection circuit for implantable cardioverter

A - Human Necessities

61

N

326/1.6

A61N 1/38 (2006.01) A61N 1/39 (2006.01)

Patent

CA 1262563

PROTECTION CIRCUIT FOR IMPLANTABLE CARDIOVERTER ABSTRACT OF THE INVENTION An implantable medical device to deliver cardioverting energy to cardiac tissue in synchrony with detected ventricular depolarizations having a low power sensing and control circuitry and high power cardioversion circuitry, sharing a common lead and interface circuitry. The lead possesses a superior vena cava electrode and ring and tip electrodes intended to be placed in the ventricle. A sense amplifier is connected across the ring and tip electrode, and the cardioversion energy is delivered across the superior vena cava electrode and the ventricular electrodes. A circuit for protecting the low voltage sense amplifier circuits from high voltage cardioversion output pulses includes a triac which is electrically shorted across the ring and tip electrodes and the input terminals of the sense amplifier during the delivery of the stimulating pulse.

473574

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