Vagus nerve stimulation (VNS) is approved for epilepsy and is currently undergoing trials for stroke in the UK. I think the results should be out soon.
Vagus nerve stimulation – Wikipedia
Epelipsy
Vagus Nerve Stimulation | epilepsy.com
Vagus Nerve Stimulation – WebMD
Vagus nerve stimulation | Epilepsy Society
Stroke
The tiny brain trainer that helps get you moving after a stroke