Displacement sensor

Details Displacement sensor Displacement sensor

1987-12-31

1989-02-21

Chambers, A. Michael

Surgery

Truss

Pad

381 67, A61R 704

Patent

active

048056332

ABSTRACT:
A displacement sensor or an electrocardiogram attaches a permanent magnet chip directly on a living body, and movement or vibration of the living body is sensed by measuring flux by said magnet. The displacement sensor has a magnet assembly having an adhesive film mounting a permanent magnet at the center of the film supported on a bottom ring which has a plurality of upright walls with jaws, for detachably engaging the magnet assembly with a sensor body. The sensor body has saturable inductors which are placed in flux by said magnet and are coupled with a process circuit having an astable multivibrator with a collector load by said saturable inductors and a low-pass filter connected to the output of the multivibrator. The magnet assembly is first adhered on a living body, then, the sensor body is engaged with the same by engaging said jaws with a ring on the sensor body, then, the process circuit provides an output signal reflecting the movement of a living body.

REFERENCES:
patent: 2294015 (1942-08-01), Salb et al.
patent: 3555187 (1971-01-01), Rowley
patent: 4458687 (1984-07-01), Dickson
patent: 4765321 (1988-08-01), Mohri

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