Tony, there is an electronic transmitter device that broadcasts sound directly to the hearing center of the brain. It's proven that the deaf can hear with it. It's not known by the medical mainstream. I learned about all kinds of alternative technology more than 10 year ago
I have had my CI for less than a year (So far, So good). The issue we forget is us! The Human body is probably the most complex machine that ever existed, designed by millions of years of evolution. While a CI only has a few decades of Engineering under it's belt. As much as we understand about our bodies, there is still much we don't!