The indications for choledochoscopic lithotripsy are as follows: 1. It is mainly applied to the extraction of all kinds of intrahepatic bile duct stones, including the left hepatic duct, the right hepatic duct and its branches at all levels. Stones can be extracted wherever the choledochoscope can enter. With the development of choledochoscope, the diameter of most choledochoscopes is 4.9mm, and now there are more micro choledochoscopes produced by Olympus, with a diameter of only 3mm. so as long as the choledochoscope can enter the place, most of the stones can be taken; 2, extra-hepatic choledochal stones, including common hepatic duct stones and choledochal stones, all of them can be taken under choledochoscopy; 3, gallbladder stones: in principle, biliary lithotripsy is not recommended, but Some patients have a strong will for biliary lithotripsy, which can be strictly screened cases for consideration, and generally use choledochoscopy to remove stones under direct vision. If you directly take the forceps blind extraction often not clean, easy to lead to postoperative recurrence. So now require choledochoscopy to do biliary lithotripsy cases, to be in the choledochoscope under direct vision to remove the stone clean. Direct vision to ensure that there is no residual stone before choosing to do this surgery, not all patients are suitable. Many people ask to do biliary lithotripsy, biliary lithotripsy has many indications, not everyone is suitable for use; 4, there are some biliary system disease diagnosis is not clear, such as stenosis, tumors also need to use choledochoscopy; 5, choledochoscopy can also be examined in the duodenal papillae, that is, the lower end of the common bile duct and the pancreatic duct confluence of the narrowest place. Many people have lesions and inflammatory strictures in the papillary part of the duodenum, leading to recurrent abdominal pain, which can be examined and treated by cholangioscopy.