The extraction of stones was at 45 cases by sponteneousness,while 20 by ballon-catheter or basket and 11 by endoscopic mechanical lithertrpsy(EML),of which the success rate of stone removal were achieved in 66.7%,80% and 90.9% respectively.

• 网蓝，气囊导管取石20例，成功率80%25 ； 机械碎石取石11 例，碎石取石满意10 例，失败1 例，总成功率90.；9%25 。