Bone-Anchored Hearing Aid
A bone-anchored hearing aid (Baha) is a type of hearing aid based on bone conduction. It is primarily suited to people who have conductive hearing losses, unilateral hearing losses, and people with mixed hearing losses who cannot otherwise wear "in the ear" or "behind the ear" hearing aids.
Bone-anchored hearing aids use a surgically implanted abutment to transmit sound by direct conduction through bone to the inner ear, bypassing the external auditory canal and middle ear. A titanium "post" is surgically embedded into the skull with a small abutment exposed outside the skin. A sound processor sits on this abutment and transmits sound vibrations to the external abutment of the titanium implant. Alternatively, an implant magnet can be attached and hidden beneath the skin. A sound processor is then attached to an external magnet and attracts to the internal magnet. The implant vibrates the skull and inner ear, which stimulate the nerve fibers of the inner ear, allowing hearing.