Combined magnetic field detector and activity detector employing

Details Combined magnetic field detector and activity detector employing Combined magnetic field detector and activity detector employing

1995-09-20

1998-01-20

Jastrzab, Jeffrey R.

Surgery

Miscellaneous

Devices placed entirely within body and means used therewith

607 17, 607 32, 128903, A61B 511, A61N 1365

Patent

active

057092257

ABSTRACT:
A medical implant contains a magnetic field detector with a sensor whose capacitance changes in the presence of a magnetic field with a predefined strength, and a capacitance-controlled unit connected to the sensor. The capacitance-controlled unit sends a measurement signal to a detection unit. If a measurement signal parameter affected by capacitance exhibits a specific change over a predefined period of time, a detection signal is generated by the detection unit to indicate the presence of a magnetic field. The sensor's capacitance also changes when the sensor moves, and this is utilized for measuring activity in an activity measurement circuit connected to the capacitance-controlled unit and for generating an activity signal on the basis of the measurement signal.

REFERENCES:
patent: 4140132 (1979-02-01), Dahl
patent: 4541431 (1985-09-01), Ibrahim et al.
patent: 4884575 (1989-12-01), Sanders
patent: 5309096 (1994-05-01), Hoegnelid
patent: 5425750 (1995-06-01), Moberg
patent: 5545187 (1996-08-01), Bergstrom et al.

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