Electronic stethoscope for monitoring the operation of a prosthetic valve implanted in a patient's heart
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United States of America Patent
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-
Feb 5, 1985
Grant Date -
N/A
app pub date -
May 4, 1983
filing date -
May 4, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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