Some of things I cannot tell you exact reasons why it won't work.
If you do not believe me that the fully implantable hearing system will work underwater, ask to speak with a user in Germany that has went swimming with one and ask them if it works when in the water or if they must turn it off.
Onto the coil. The coils on implants, whether fully implantable, cochlear, or semi-implantable systems are tuned for a specific inductance and frequency and will only pick that up. They are made to do two things: 1) send power internally via RF and on some devices 2) send audio data in.
On semi-implantable systems, the RF coils have the bandwidth to carry audiodata, fully implantable the audio data is handled internally and the coils are not designed for that.
The semi-implantable versions of the middle ear implants can have the audio liek you want, if the company is willing to support it. You need to look at the product age and what has been improved since inception. I would also warn you to do your homework on financial stability of any implant company you decide to go with.
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