Stimulus system with controllable switched capacitor output stag

Details Stimulus system with controllable switched capacitor output stag Stimulus system with controllable switched capacitor output stag

1998-04-17

1999-10-12

Getzow, Scott M.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 1362

Patent

active

059647876

ABSTRACT:
There is provided an output stage for a battery powered implantable device, such as a cardiac pacemaker, for generating biphasic or triphasic pulses, each pulse having at least a prestimulus or poststimulus pulse of a first polarity, and a stimulus pulse of opposite polarity. The output stage provides for charging of a small sized pacing capacitor from the battery through a high rate charge pump only during delivery of a prestim or poststim pulse, and for discharging the pacing capacitor during the stimulus portion of the overall pulse. A fast or high rate capacitive charge pump is used with a controllable high rate clock signal, adjustment of the clock signal being used for controlling the charging rate during the prestim or poststim pulses, thereby allowing for tuning of the parameters of the prestim or poststim pulse portions. The charge pump is enabled only during such charging pulse durations, thereby eliminating the need for a large holding capacitor, and enabling an output stage with a significantly reduced capacitor requirement.

REFERENCES:
patent: 4343312 (1982-08-01), Cals et al.
patent: 4373531 (1983-02-01), Wittkampf et al.
patent: 4401120 (1983-08-01), Hartlaub et al.
patent: 4550370 (1985-10-01), Baker
patent: 4556063 (1985-12-01), Thompson et al.
patent: 4768512 (1988-09-01), Imran
patent: 4821724 (1989-04-01), Whigham et al.
patent: 4903770 (1990-02-01), Whigham et al.
U.S. application No. 08/915,677, Weijand et al, filed Aug. 19, 1997.

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