Laser lithotripsy was invented at the Wellman Center for Photomedicine at Massachusetts General Hospital in the 1980s to remove impacted urinary stones. Optical fibers carry light pulses that pulverize the stone. Candela licensed the technology and released the first commercial laser lithotripsy system.[1] Initially 504 nm dye lasers were used, then holmium lasers were studied in the 1990s. Several companies currently produce holmium lasers for lithotripsy including Lumenis, DirexGroup, Trimedyne, and Electro Medical Systems.