Other

Massachusetts Eye and Ear Infirmary

Joseph B Nadol, Jr

Saumil N Merchant

This invention relates to surgical methods and prosthetic devices for ameliorating hearing loss in patients having ailments of the middle ear. The implant of the invention includes a gas-filled balloon having a pliant membrane of biocompatible material. The balloon is made such that the acoustic impedance presented by the balloon to the eardrum is low enough to permit the eardrum to vibrate freely in response to sound waves. Because the balloon membrane is substantially impermeable to gases and water, the implant can function effectively within the middle-ear chamber for an extended period.

Middle-ear implant

This invention relates to surgical methods and prosthetic devices for ameliorating hearing loss in patients having ailments of the middle ear. The prosthetic device of the invention includes at least a synthetic gas-filled balloon having a pliant membrane of biocompatible material. The surgical method of the invention places the synthetic balloon in the patient's middle ear in contact with the tympanic membrane to restore tympanic membrane motion so as to enhance transfer of sound through the middle ear to the inner ear of the patient.

Hearing prosthesis

For treatment of conductive hearing loss due, for example, to serous otitis media, a synthetic bubble is implanted in the hypotympanic cavity to displace fluid allowing free motion of the round window. A thin membrane provides the required degree of compliance, and is substantially impermeable to gases and water vapor, resulting in an extended lifetime. A large molecule inert filler gas may be used, either alone, or with normal gases to provide certain partial inflation states wherein osmotic ingress of smaller molecular gases causes sustained self-inflation of the bubble for a substantial time.

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Needham, MA, United States of America

Joseph B Nadol, Jr