That is lithotripsy. They use targeted ultrasonic sound pulses to break up kidney stones without surgery. I have had it done 3 times over the last 25 years.i've read on its (shockwave) use on kidney stones.
The 2nd time, the rubble clogged my kidney and it took them 5 days to get a stent put in - which I had for 10 days with a string hanging out. Those 5 days were spent in a hospital that was gradually shutting down, so I was alone in the last room of a hall with only a handful of patients and I was high as a kite on Demerol. Every 3 1/2 hours for 5 days they gave me a bag but I was hurting for it at 3. I swore my night nurse was a Voodoo Queen . . .