Cochlear

https://www.cochlear.com/intl/home

The Cochlear implant is the most popular surgical implant device. Wikipedia describes the technology this way “Cochlear implants bypass the normal acoustic hearing process, instead replacing it with electric hearing. Namely, the sound sensation comes from the sound that is converted to electric signals which directly stimulate the auditory nerve. The brain adapts to the new mode of hearing, and eventually can interpret the electric signals as sound and speech”

Learn more about middle ear implants here: https://www.hearinglink.org/your-hearing/implants/middle-ear-implants/