This is performed for stones in the kidney or ureter. It is performed under general anesthesia. The stone is located using X-ray guidance and a specific number of external shocks are given in order to crush the stone into tiny sand-like particles that are easier to pass. The fragments are usually passed within the first few days after the procedure. The procedure is performed as an outpatient and you will be sent home with a strainer to collect the fragments . Please bring the fragments to your follow up visit. After effects may include blood in the urine and kidney pain.