I have a damaged nerve in my neck. I have used Bioness Stimrouther and currently have sprtheraputics sprint pns. also check out nalu. the only thing implanted is the lead. the stimulators are external. keep in mind that sprint is only for 60 days but some patients received good relief for a many months after. its the least invasive of all pns systems. the lead is installed with local anesthetic only.