Hi and welcome to HCM,thank you for your query.
Puestow procedure is used to treat pancreatic diseases, not bile duct obstruction
.you should do ERCP first to see can it be fixed without surgery.if not,then you need to do choledcohotomy and choledochojejunoanastomosis. Puestow is used for obstruction of pancreatic duct
and in some cases of chronic pancreatitis
Wish you good health. Regards.