Retrograde Intrarenal Surgery is a non-invasive method to break down stones in the ureters and kidneys while also pulling them out or allowing them to be flushed out with urine. A flexible scope is introduced into the urethra. It is inserted into the ureters from the urinary bladder. It is a scope with a camera at the end, and another scope has a laser fiber device called the Holmium laser. This laser pulverizes the stones into debris, which is collected in a basket-like frame in the scope, and then pulled out.