Earplug

Details Earplug Earplug

1986-04-03

1987-10-27

Hafer, Robert A.

Surgery

Truss

Pad

A61F 1100

Patent

active

047022388

ABSTRACT:
An earplug for attenuating sound and providing a watertight seal at the auricle is provided which is made of solid, closed cell, slow recovery foam having an external flange adapted to extend beyond the auricle, the surface of the plug being convex to reflect away sound, and having an inwardly extending conical portion fitting into the auricle or cavum concha and the outer portion of the auditory canal sealing off the meatus of the external ear canal without substantially penetrating the external ear canal. The closed cell foam provides a multitude of convex and concave surfaces which dramatically reflect, dissipate and attenuate sound waves.

REFERENCES:
patent: 904715 (1908-11-01), McWilliams
patent: 1016877 (1912-02-01), Elliott
patent: 1335276 (1920-10-01), Schultz
patent: 2881759 (1959-04-01), Hocks et al.
patent: 3415246 (1968-12-01), Hill
patent: 3833701 (1974-09-01), Johnson et al.
patent: 4160449 (1979-07-01), Wade
patent: 4537187 (1985-08-01), Scott
patent: 4582053 (1986-04-01), Wilson

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