Extracorporeal Shockwave Lithotripsy is a technique for treating stones in the kidney and ureter that does not require surgery and is an outpatient, non-invasive option . Instead, high energy shock waves are passed through the body and used to break stones into pieces as small as grains of sand. Because of their small size, these pieces can pass from the body along with the urine. Using x-rays or ultrasound to pinpoint the location of the stones, the body is positioned so that the stones are targeted precisely. About 1-2 thousand shock waves are needed to crush the stones. The complete treatment takes about 45 to 60 minutes.