Surgery – Truss – Pad
Patent
1978-11-03
1980-12-09
Kamm, William E.
Surgery
Truss
Pad
D61N 136
Patent
active
042378974
ABSTRACT:
A battery life extender for use in an implantable tissue stimulator. The tissue stimulator comprises a battery which powers a volatile memory, control circuits and a pulse output circuit all of which are connected in parallel across the battery. The invention provides a means for controlling current through the output circuit as a function of a difference voltage between the battery output voltage and a reference voltage. The reference voltage and battery voltage comprise inputs to a differential amplifier which in turn provides an output control voltage which controls a field-effect transistor (FET) connected in series with the output circuit and battery. As this control voltage rises, current through the field-effect transistor is reduced, thereby reducing the amplitude of the pulses from the output circuit and the current drain from the battery. This keeps the battery output voltage high and maintains a more nearly constant voltage on the volatile memory and control circuits for a longer period of time than would otherwise be available.
REFERENCES:
patent: 3669120 (1972-06-01), Nielsen
patent: 3842844 (1974-10-01), Alferness
patent: 3901247 (1965-08-01), Walmsley
patent: 4095603 (1978-06-01), Davies
patent: 4120306 (1978-10-01), Renirie
Beane Russell R.
Mann Brian M.
Kamm William E.
Pacesetter Systems Inc.
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