Electrocardiograph

Details Electrocardiograph Electrocardiograph

1988-07-28

1989-06-20

Howell, Kyle L.

Surgery

Truss

Pad

381 67, 381177, A61B 704

Patent

active

048401838

ABSTRACT:
A displacement sensor for an electrocardiograph 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 electrocardiograph 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 projection on the sensor body, then, the process circuit provides an output signal reflecting the movement of a living body. Said jaw on the sensor body and/or the magnet assembly has a slanted surface for easy coupling and/or detachment of the sensor body and the magnet assembly. Said adhesive film is covered with a removable paper, which is removed when the device is used. The length between said permanent magnet and said saturable inductors is set a little longer than the desired length for operation, taking into consideration the convexed profile of a human body.

REFERENCES:
patent: 2311416 (1943-02-01), Salb et al.
patent: 2583941 (1952-01-01), Gordon, Jr.
patent: 3555187 (1971-01-01), Rowley
patent: 3867925 (1975-02-01), Ersek
patent: 4458687 (1984-07-01), Dickson
patent: 4765321 (1988-08-01), Mohri
patent: 4805633 (1989-02-01), Kotani et al.

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