Implantable human tissue stimulator with memory protect means

Details Implantable human tissue stimulator with memory protect means Implantable human tissue stimulator with memory protect means

1978-11-03

1980-04-15

Kamm, William E.

Surgery

Truss

Pad

128419PS, A61N 136

Patent

active

041978501

ABSTRACT:
In an implantable human tissue stimulator with a volatile memory an arrangement is provided to protect against the stimulating circuitry producing pulses as a function of unknown parameters in the memory, as a result of inadequate power to the memory from a rechargeable power source, e.g. a rechargeable battery. The arrangement includes voltage sensors, so that when the voltage from the battery drops below a selected level the stimulating circuitry is disconnected from the battery and only the memory is powered. If the voltage from the battery first drops, so that insufficient power is supplied to the memory and thereafter rises, as a result of recharging, to a level sufficient to power the memory, the memory is first reset with known parameter values. Only thereafter when the voltage level reaches the selected level, is the rest of the circuitry, including the stimulating circuitry, reconnected to the battery.

REFERENCES:
patent: 3885572 (1975-05-01), Chen
patent: 4024875 (1977-05-01), Putzke
patent: 4096866 (1978-06-01), Fischell
patent: 4120307 (1978-10-01), Jirak et al.
patent: 4124031 (1978-11-01), Mensink et al.

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