“Classic” hearing aids use the air to conduct. It transmits the amplified sounds from the hearing aid to the eardrum using the ear canal, imitating normal hearing path (eardrum - middle ear - inner ear - hearing nerve).
But, in cases where you can’t relay on the regular hearing path you can use Bone Anchored Hearing Aid (BAHA). BAHA transmits the sounds directly to the skull. The sounds’ vibrations reach the inner ear and bypass the outer and the middle ear. It can be used on several medical conditions such as conductive hearing loss, problems with the ossicles and others.
You can read more on bone anchored hearing aids here.
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