Abstract
A 2.3-mm soft pig tail balloon catheter was developed to be used for percutaneous transhepatic biliary drainage. A small balloon (OD 10 mm) secures an optimal internal fixation and side holes behind the balloon secure drainage of the cannulated bile duct peripheral to the balloon. Successful transhepatic biliary drainage with the pig tail balloon catheter was achieved in 11 of 12 patients for a period of 3 to 67 days (median 6 days). In one patient the catheter clogged after 55 days of drainage. No case of catheter dislodgement or other complications related to the external drainage was seen.