The time that T tube is drawn out is on 14 postoperative days.Bacteria may exist in bile continuously and play a role on relapse of choledochitis and bile duct stone.

• 管引流能有效地降低胆汁粘度，而胆汁中细菌量在引流术后第3周才有显著减少，临床2周时拨除T管细菌可潜伏下来，对胆管炎和胆管结石的复发可能起作用。