PROBLEM TO BE SOLVED: To provide a medical catheter capable of suppressing lowering of concentration of a medicine supplied into a lumen.SOLUTION: A medical catheter is inserted into the vicinity of a closed part C inside a vessel V in a state that an expansion member 13 is stored inside an outer tube 11, an inner shaft 12 is advanced to the outer tube 11, and the expansion member 13 is projected in front of the outer tube 11 to expand the expansion member 13 in an outside direction in the radial direction of the outer tube 11. Thereafter, when supplying a gelatinous medicine M to a space between the expansion member 13 and the closed part C through a lumen 12a of the inner shaft 12, blood filled between the expansion member 13 and the closed part C flows through a plurality of flow ports 13c of a sheet member 13b. Further, when advancing the expansion member 13 together with the outer tube 11 and the inner shaft 12, only the gelatinous medicine M is pressed in toward the closed part C.COPYRIGHT: (C)2015,JPO&INPIT【課題】管腔内に供給された薬剤の濃度低下を抑制することができる医療用カテーテルを提供する。【解決手段】拡張部材13が外管11の内部に収納されている状態で医療用カテーテルを血管V内の閉塞部Cの近傍にまで挿入し、外管11に対し内部シャフト12を前進させて拡張部材13を外管11の前方へ突出させることにより拡張部材13を外管11の径方向外方へ拡張させ、内部シャフト12のルーメン12aを通してゲル状の薬剤Mを拡張部材13と閉塞部Cの間に供給すると、拡張部材13と閉塞部Cの間に充満していた血液は、シート部材13bの複数の流通口13cを流通する。さらに、拡張部材13を外管11および内部シャフト12と共に前進させると、ゲル状薬剤Mのみが閉塞部Cに向けて押し込まれる。【選択図】図8
