be made on the data chart as particular marks become visible through the endoscope the readings are used to form a profile of the muscular compliance along the length of the sphincter of oddi 208 usually three or four passes are made with the manometry catheter in order to obtain sufficient data for analysis the number of passes required is partially determined by the number of manometry recording ports with fewer ports requiring additional passes the pressure readings measured within the sphincter of oddi 208 help the physician determine if a sphincterotomy sometimes called a papillotomy if performed by cutting from outside of the papilla into the sphincter would be an appropriate treatment for the patient if so the sheath 82 is further advanced into the common bile duct 200 as depicted in fig7 until the sphincterotome portion 102 of the sheath 90 is aligned with the sphincter of oddi 208 with the cutting portion 106 properly oriented to ablate the sphincter 208 and or papilla 204 and enlarge the opening to the duodenum the sphincterotomy papillotomy is performed as it would be with a typical sphincterotome depending on clinical factors such as whether the sphincter needs to be pre cut to allow better access then the sheath 90 is pulled back into the endoscope and withdrawn from the patient the described procedure may be varied according to physician preference and the particular needs of the patient ablation procedures for other anatomical sites should be based on existing practice and should be already apparent to one skilled in the particular procedure any other undisclosed.