Well....honestly, it’s probably more sensible to have you look it up than me trying to explain it clearly! Many brands, some (but not likely limited to) are Medtronics (what I have), Boston Scientific, Abbot, Nevro, etc. etc. It involved some minimal incisions on my lower back, a bit of sedation once it was placed (by testing nerve reaction). Hardest thing for me was many movement restrictions postop for quite awhile so electrode leads did not get pulled out of place or broken. Was home within a few hours total.
Many people claim to have no luck with it, I have had marvelous results with it. For me, it was an option to try vs a second very involved back fusion surgery. Injections didn’t do anything and I have “severe” stenosis on MRI at L5-S1. Patients DO get to trial it first before permanent placement.