Displacement sensor for a living body

Details Displacement sensor for a living body Displacement sensor for a living body

1986-11-14

1988-08-23

Howell, Kyle L.

Surgery

Truss

Pad

381 67, 381177, A61B 704

Patent

active

047653213

ABSTRACT:
A displacement sensor for a living body provides an improved stethoscope and/or cardiogram. The apparatus has a diaphragm which is placed on the surface of a living body, a permanent magnet located on the diaphragm, an inductor arrangement located adjacent to the permanent magnet so that the saturable inductor changes its inductance according to movement or vibration of the magnet, a processor circuit which processes the inductance variation in the inductors to provide an electrical output signal for visual display and recording purposes, and a hollow sound tube which introduces an acoustic vibration sound of the diaphragm to the ears of a doctor. The present apparatus provides not only acoustic sound output but also visual display and a printed copy as a mechanocardiogram sensor.

REFERENCES:
patent: 2294015 (1942-08-01), Salb et al.
patent: 2583941 (1952-01-01), Gordon, Jr.
patent: 3555187 (1971-01-01), Rowley
patent: 4072822 (1978-02-01), Yamada
Sakaguchi et al.; "A New Simple Mechanostimulator with Special Reference to its Physiological Applic."; IEEE Trans. on Biomed. Eng., vol. BME-25, No. 5, 9-1978, pp. 484-486.

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