Yes it's called vagus nerve stimulation. Also check autifony, AM101 and acoustic neuro modulation...all 3 are very promising and successful in phase1 trials except autifony which is not tried on humans yet(but that drug vanished tinnitus in rats) I think we have something to look forward to in future for tinnitus. We already have partially working treatments like TRT, CBT. Various anxiety and depression drugs, neuromonics, loads of other alternative therapies, etc..I bet we will have a reliable working treatment for all in next 7 years