Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1982-05-12
1984-04-03
Fuller, Benjamin R.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
A61B 702, H04R 2500
Patent
active
044402589
ABSTRACT:
A stethoscope head comprising a body member having a first generally bell-shaped recess, a diaphragm, a suspension member for connecting the diaphragm to the body member, and an immobilizing means located within the first recess. The suspension member affords movement of the diaphragm in a direction generally perpendicular to the plane of the diaphragm without the shape of or lateral tension in the diaphragm changing substantially. The suspension member also permits at least one of the diaphragm and the suspension member to contact the immobilizing means to cause the acoustical stiffness of the diaphragm to increase significantly. In a preferred embodiment the suspension member comprises a compliant ring and the immobilizing means comprises an O-ring situated circumjacent a plate-like member having a centrally sloping depression in its surface.
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A. B. Cohen, Hi-Fi Loudspeakers and Enclosures, Hayden Book Company, N.J., pp. 24-25, 56-58 and 83-85, (1968).
Fuller Benjamin R.
Minnesota & Mining Manufacturing Company
Sell Donald M.
Smith James A.
Sprague Robert W.
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