Electronic stethoscope for monitoring the operation of a prosthe

Details Electronic stethoscope for monitoring the operation of a prosthe Electronic stethoscope for monitoring the operation of a prosthe

1983-05-04

1985-02-05

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Stethoscopes, electrical

181131, 128715, H04R 146

Patent

active

044981880

ABSTRACT:
An electronic stethoscope for monitoring prosthetic valves for hearts includes a casing to which the center portion of a spring member is mounted. A weighted housing is mounted to the ends of the spring member and contains an opening therethrough in which a magnetic circuit comprising a pole piece, magnet and coil are positioned. The air gap between the pole piece and magnet is varied as the relative distance between the center of the spring and housing vary in response to the operation of a prosthetic heart valve thereby resulting in an induced voltage in the coil which may be amplified and monitored.

REFERENCES:
patent: 3233041 (1966-02-01), Croslin
patent: 3555187 (1971-01-01), Rowley

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