distend
6.A hollow, flexible tube for insertion into a body cavity, duct, or vessel to allow the passage of fluids or distend a passageway. Its uses include the drainage of urine from the bladder through the urethra or insertion through a blood vessel into the heart for diagnostic purposes.
7.Notably, Applying choledochoscope in the mid of operation to remove retained calculus, distend stricture of bile duct and guide selection of appropriated operation decreased the ratio of retained calculus in operation from 78.0% (409/524) to 24.4%(128/524).


