Summary
Active middle-ear implants (AMEIs) mechanically drive an ossicle or cochlear window. They amplify sound for the operated cochlea and require usable cochlear and neural function.
Consider an AMEI for selected conductive, mixed or sensorineural loss when conventional aids are unsuitable or inadequate and the cochlea can benefit from amplification; compare with bone-conduction and cochlear-implant options in the implant MDT. NHS England BCHI/MEI policy 16041/P
More detail
Electromagnetic devices: a coil and magnet generate movement. Piezoelectric devices: a ceramic element deforms under electrical drive.
Advantage: an open ear canal without an occluding earmould. Disadvantages: middle-ear surgery, coupling failure and lifelong device follow-up.