During ERCP, Sphincterotomy (cutting the muscle surrounding the mouth where the pancreas and biliary tract open together), removal of stones in the biliary tract, stent placement in the bile ducts or pancreatic ducts, expansion of the narrowed area in the duct with a balloon, can be used to take samples from suspicious tissues in the bile duct or pancreatic duct, Manometry catheter The pressure in the sphincter can be measured with a special tube called