A method and apparatus are disclosed for improving the hearing of a hearing-impaired subject who, if anatomically normal, possesses a tympanic membrane intended for generating mechanical tympanic vibrations in response to sound waves impinging thereon, an inner ear responsive to mechanical vibrations,...http://www.google.co.uk/patents/US4850962?utm_source=gb-gplus-sharePatent US4850962 - Implantable hearing aid and method of improving hearing
