Constant current sources with programmable voltage source

Details Constant current sources with programmable voltage source Constant current sources with programmable voltage source

1989-11-13

1992-10-13

Kamm, William E.

Surgery

Truss

Pad

323266, A61N 132

Patent

active

051541726

ABSTRACT:
An implant for stimulating the vagus nerve receives commands over a radio frequency link. The communication protocol uses asynchronous communications devices with parity checking and echoing of communicated characters and passwords to improve communication error checking. The implant disables a voltage convertor used in providing the stimulation signal at periodic intervals to monitor for communications attempts. The implant provides radio frequency marker pulses before providing stimulation signals of certain frequencies. During the providing of stimulation signals the implant monitors the voltage overhead present between the voltage source and the load and adjusts the overhead to a desired level. The implant changes the voltage applied to certain internal components during stimulation periods to allow full power operation during those intervals and reduced power levels at other intervals. The implant is reset by the placing a magnet in a given location in conjunction with the application of a radio frequency transmission for a given period.

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Medtronic, Inc., "MINIX 8340/8341/8342 Technical Manual", 1988, p. 41.
Schematic of Muscle Stimulator, date prior to Nov. 13, 1989.

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