Implantable medical devices employing capacitive control of high

Details Implantable medical devices employing capacitive control of high Implantable medical devices employing capacitive control of high

1991-09-05

1993-01-12

Howell, Kyle L.

Surgery

Truss

Pad

A61N 139

Patent

active

051781409

ABSTRACT:
An implantable device for treating a malfunctioning heart is disclosed. The device includes a high voltage circuit having a tank capacitor for storing therein during a charging mode of operation thereof high voltage DC electrical energy and for delivering such energy to a malfunctioning heart in the form of an electrical shock during a discharging mode of operation thereof. The device further includes a high voltage switch coupled to the high voltage circuit for switching, in the order of microseconds, the high voltage circuit between its charging and discharging modes of operation; a power supply for providing low voltage electrical energy for use in controlling the high voltage switch; a control circuit coupled between the power supply and the high voltage switch and capable of driving the high voltage switch to switch its output in the order of microseconds, for controlling the operation of the high voltage switch; and capacitors for capacitively coupling the power supply to the control circuit and electrically isolating the high voltage DC electrical energy from the power supply. The control circuit includes a common mode switch for rejecting common mode noise, and an additional switch for rapidly changing the output state of the high voltage switch.

REFERENCES:
patent: 4170740 (1979-10-01), Pernyeszi
patent: 4559946 (1985-12-01), Mower
patent: 4960123 (1990-10-01), Maker
patent: 5048521 (1991-09-01), Pless et al.
S. L. Hurst book entitled "Custom-Specific Integrated Circuits," p. 111, published by Marcel Dekker, Inc., 270 Madison Avenue, New York, N.Y. 10016 (1985).

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