Surgery – Truss – Perineal
Patent
1984-03-22
1986-12-16
Coven, Edward M.
Surgery
Truss
Perineal
389 683, A61B 502, H04R 2500
Patent
active
046289070
ABSTRACT:
A direct contact hearing aid apparatus adapted to be mounted deep within the ear canal is disclosed, including an output electromechanical transducer for converting audio output signals into mechanical movement of an output coupling element without the production of discernible sound waves to prevent acoustic feedback. The coupling element is supported in direct contact with a contact element mounted on the tympanic membrane by a metal clip attached to the malleus bone to provide direct electromechanical coupling to the ossicles through the tympanic membrane. The contact element is made of magnetic material, such as a permanent magnet, and is magnetically connected to the coupling element. A pair of magnetic switches are provided within the hearing aid housing for mechanically switching the connections of the battery and a volume control while the hearing aid is mounted in the ear canal in response to changes in the polarity of a remote external magnetic actuator located outside of the housing. An external magnetic insertion probe is used for insertion and removal of the hearing aid into and from the ear canal by magnetic engagement with a magnetic holder member on the housing. The output transducer of the hearing aid may be a piezoelectric plastic film transducer in the form of a flexible diaphragm or a folded sheet bender of the bimorph type, or it may be an electromagnetic transducer. A counterpoise means which may include a weight mounted on a second transducer element that moves in an opposite direction to the output coupling element, is employed to reduce internal vibration of the hearing aid apparatus. A permanent magnet suspension means is employed to support a pivoted motor element of the output transducer connected to the output coupling element for greater resiliency.
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