Magnetic field detector

Details Magnetic field detector Magnetic field detector

1996-12-20

1997-12-09

Kamm, William E.

Surgery

Miscellaneous

Devices placed entirely within body and means used therewith

607 27, 324260, 1286531, A61B 505

Patent

active

056949529

ABSTRACT:
In a magnetic field detector as well as in a combined telemetry and magnetic field detector unit in a medical implant, a magnetic field sensor with a coil and a diode are employed for determining the presence of a magnetic field. For making such a determination, the coil is charged by a source of voltage for a defined period of time, the time for the discharge of the coil through the diode depending on whether a magnetic field is present. A detection signal indicating the presence of a magnetic field is generated if the discharge time is less than a defined time threshold value.

REFERENCES:
patent: 3659591 (1972-05-01), Dou et al.
patent: 4541431 (1985-09-01), Ibrahim et al.
patent: 4611127 (1986-09-01), Ibrahim et al.
patent: 5438990 (1995-08-01), Wahlstrand et al.

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