I had an tens unit implanted in 1995, it worked somewhat. I can only explain it like this, when the pain down the back of my legs was a cutting pain I could turn the tens on and it would change the pain sensation into a burning pain and vise versa. It lasted about 2 months and the leads moved and it had to be taken out. I have seen many get the pumps, more than half of those guys are not among the living, not sure why but they don't live many years after they get one. My civilian doc was trying to force me to get one, thats how I ended up at the VA. Good Luck whichever road you take.