Structural classification of choledochoscope

1. Hard choledochoscopy: It can only be used for choledochoscopy and treatment during surgery.
2. Soft choledochoscopy (fibrous choledochoscopy) : It can be used for intraoperative, postoperative and percutaneous transhepatic choledoscopy and treatment.
3. Transoral fibercholedochoscope: It can be used to enter the biliary tract directly through the mouth for examination and treatment after endoscopic duodenal papillary sphincterotomy (EST).