Use of telemetry coil to replace magnetically activated reed swi

Details Use of telemetry coil to replace magnetically activated reed swi Use of telemetry coil to replace magnetically activated reed swi

1984-09-20

1985-09-17

Kamm, William E.

Surgery

Truss

Pad

128903, A61N 136

Patent

active

045414319

ABSTRACT:
A combined telemetry system and magnetic field sensor for use in an implantable medical device. The telemetry system includes a conventional resonant circuit for transmitting and receiving data. The resonant circuit has a coil which is also used to sense the presence of a magnetic field exceeding a threshold value. The resonant frequency varies with the strength of the magnetic field which passes through the coil. Periodically, the resonant circuit is energized, and during a sensing window of predetermined duration which then immediately follows the voltage across the coil is examined for a predetermined number of zero crossings. That number of zero crossings will occur only in the presence of a magnetic field whose amplitude exceeds the threshold value. It is possible to achieve a sensitivity in such a system which is comparable to that of conventional miniature reed switches.

REFERENCES:
patent: 4223679 (1980-09-01), Schulman et al.
patent: 4361153 (1982-11-01), Slocum et al.
patent: 4453162 (1984-06-01), Money et al.
patent: 4494545 (1985-01-01), Slocum et al.

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