True about BAHA
BAHA: Bone anchored hearing aid is a type of hearing aid which is based on the principle of bone conduction. BAHA uses a surgically implanted abutment to transmit sound by direct conduction through bone to cochlea, bypassing the external auditory canal and middle ear. When air-conduction (AC) hearing aid cannot be used: - Canal atresia, congenital or acquired, not amenable to treatment. - Chronic ear discharge, not amenable to treatment. - Excessive feedback and discomfo from air-conduction hearing aid. Conductive or mixed hearing loss, e.g. otosclerosis and tympanosclerosis where surgery is contraindicated. Single-sided hearing loss. For severe bilateral SNHL--Cochlear implant is used. For bilateral acoustic neuromas in Neurofibromatosis - auditory brainstem implant is used.
Useful in canal atresia and microtia
Useful in bilateral severe SNHL
Useful after surgery in neurofibromatosis 2 for acoustic neuroma
It can bypass cochlea