i did a quick search when this was first brought up...
From
Frequently asked questions
How the Esteem® works
How does it work? It basically has a motor that stimulates the stapes. Therefore they can control how much input the cochlea recieves. So if they make the stapes move MORE than normal at that decible, the cochlea would recieve more input, therefore sounding louder to the recipient. In order for it to work, you must have at least SOME working cilia hairs in the cochlea, therefore it wouldn't work with people who are profoundly deaf.
What worries me though, is wouldn't it just overstimulate your cochlea like working in a noisy environment, slowly making you loose (even more) your high frequencies??? And if it breaks, you have to go through surgery again, and would be totally without sound in the meantime because the middle ear is not connected (unless, of course, you had a bone conduction hearing aid to fill in the time gap until surgery).
Iunno, just sounds like a strange concept to do surgery when a non-surgical intervention (a hearing aid) would do the same thing (assuming you had normal inner ear function).
Just my thoughts,
*EQL*