Abstract
Implantable hearing aids comprise two distinct subgroups: bone anchored hearing aids (BAHA) and middle ear implants (MEI). Both require surgeries and both require that some portion, or an entire device, be implanted either behind the ear in the mastoid area (BAHA) or in the middle ear cavity (MEI). Depending on the manufacturer, some MEIs also require that some components be implanted in the mastoid area. Other than these two common points, these implantable aids differ in use and function. The BAHA is used for those with conductive or mixed hearing loss, while the MEI is used most often for those with sensorineural hearing loss. Historically, some MEIs were designed for use with conductive hearing losses, but the vast majority of MEIs are to be used in patients with sensorineural hearing losses.
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