PROBLEM TO BE SOLVED: To provide a medical catheter capable of effectively administering a desired amount of medicine to a lesion part such as a closed part.SOLUTION: When injecting an expanding fluid into an expansion chamber 23 of a balloon 12 from a state that an opening part 26 of a medicine storage chamber 25 in which the balloon 12 is folded and a medicine M is stored is closed by a closing member 27 to expand the balloon 12, stress F1 toward a distal direction is applied to the closing member 27 from the balloon 12. Thereby, when the closing member 27 moves to the distal side to a position distant from a distal part 12a of the folded balloon 12, restraint by the closing member 27 is released, the opening part 26 of the medicine storage chamber 25 is opened, and the medicine M pressed by the balloon 12 is discharged in the distal direction of a shaft body 11 from the medicine storage chamber 25 through the opening part 26.COPYRIGHT: (C)2015,JPO&INPIT【課題】閉塞部等の病変部に所望の量の薬剤を効果的に投与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】バルーン12が折り畳まれて薬剤Mが収容された薬剤収容室25の開口部26が閉鎖部材27により閉鎖された状態から、バルーン12の拡張室23内へ拡張用流体を注入してバルーン12を拡張させると、バルーン12から閉鎖部材27に先端方向を向いた応力F1が作用し、閉鎖部材27が、折り畳まれたバルーン12の先端部12aから離れた位置まで先端側に移動すると、閉鎖部材27による拘束が解かれて薬剤収容室25の開口部26が開放され、バルーン12によって押圧された薬剤Mが薬剤収容室25から開口部26を通してシャフト本体11の先端方向へ放出される。【選択図】図3
