I asked a question during the conference I attended this past weekend, because a gentleman on the Italian forum asked whether or not the Cochlear Implant provoked tinnitus or could worsen tinnitus. My surgeon responded that in 70% of the cases, the tinnitus improved, and that there are ongoing trials where adults with really bad tinnitus and unilateral hearing loss are receiving cochlear implants to relieve the tinnitus.
I found that fascinating so I began to surf. The only article touching on this that I almost found is available here. It mentions the idea, but the site was not available, so I haven't read the article. Just throwing it out there because it's the first time I've ever heard of cochlear implants being okayed in unilateral hearing loss.