PROBLEM TO BE SOLVED: To excellently discharge fluid in a living organ and to selectively discharge fluid at a boundary part connecting a plurality of living organs.SOLUTION: A medical tube 10 (a drain tube 10) includes a main shaft tube 20, a flow-path opening/closing mechanism 40, and branched tubes 30. The main tube 20 has a main shaft side end opening 21a and a main shaft lumen 21 inside. The flow-path opening/closing mechanism 40 puts the main shaft lumen 21 into a communication state by having smaller pressure than prescribed and, by having more than prescribed pressure, puts the main shaft lumen 21 into a disconnected state. The branched tubes 30 are provided in the middle position in an axial direction of the main shaft tube 20 and, based on more than prescribed pressure, flow of the pancreatic juice pj into the branched lumen 31 is facilitated.SELECTED DRAWING: Figure 1【課題】生体器官内の流体を排出し、且つ複数の生体器官同士を接続した境界部分の流体も選択的に排出する。【解決手段】医療用チューブ１０（ドレーンチューブ１０）は、主軸チューブ２０、流路開閉機構４０及び分枝チューブ３０を備える。主軸チューブ２０は、主軸側先端開口２１ａ及び主軸ルーメン２１を内部に有する。流路開閉機構４０は、所定よりも小さい圧力がかかることで主軸ルーメン２１を連通状態とし、所定以上の圧力がかかることで主軸ルーメン２１を遮断状態とする。分枝チューブ３０は、主軸チューブ２０の軸方向の途中位置に設けられ、所定以上の圧力がかかることに基づき分枝ルーメン３１内への膵液ｐｊの流入が促進される。【選択図】図１
