I had lithotripsy quite a while ago, immersed in a big tank of water under general anesthesthia. Not sure how many years ago that was. I don't remember that any pain was involved at all ~ I certainly felt much better after the procedure than I had beforehand!

A more recent kidney stone attack, in the summer/fall of 2006, led to an appointment for another lithotripsy (as same-day surgery), but I passed the stone the night before. Phew!