Power converter apparatus for defibrillating cardiac pacemaker

Details Power converter apparatus for defibrillating cardiac pacemaker Power converter apparatus for defibrillating cardiac pacemaker

1993-12-15

1996-01-30

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

607 5, 607 7, A61N 100

Patent

active

054885531

ABSTRACT:
A power converter apparatus adapted for use in a defibrillating cardiac pacemaker, to selectively provide a prescribed high voltage useful in treating a cardiac fibrillation. A pulse generator-cyclically applies a relatively low battery voltage V.sub.s to a step-up transformer, to controllably charge a high-voltage capacitor. The time durations of the cyclic applications of the battery voltage V.sub.s are controlled by digital feedback of several parameters, including peak transformer current, average transformer current., battery voltage V.sub.s, and the voltage on the high-voltage capacitor. If any of the measured parameters is determined to be outside a predetermined limit, the pulsing of the transformer is incrementally modified. A smooth, efficient charging of the high-voltage capacitor thereby is provided.

REFERENCES:
patent: 5285779 (1994-02-01), Cameron et al.
patent: 5313881 (1994-05-01), Balakrishnan
patent: 5381327 (1995-01-01), Yan

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