I actually did not know what was used on me until I got my medical records. I had two in office proceedures call Katamine infusion. It worked for me for periods of time, but the underlying condition had to be resolved with surgery. I have Np still in my left arm. The proceedue was done with a machine for guidance and was like a mini operating type of theater. For me the proceedure didn't hurt. I would do it again if I had to. ginnie