PROBLEM TO BE SOLVED: To provide an dilation catheter, in which a liquid medicine is only administered to a desired region and reducing the catheter diameter is possible.SOLUTION: The dilation catheter has a tube body 2 having a first lumen 3 and a second lumen 4 formed therein, and a shrinkable or foldable expanding body 6 provided at the distal end of the tube body 2. This expanding body 6 has a multiple structure consisting of at least the two layers of inner and outer layers 8 and 7 mutually in a close contact with each other. The first lumen 3 communicates with the interior of the inner layer 8. The outer layer 7 is provided with a liquid medicine release function to release the liquid medicine outward after its supply from the layer 7s side contacting the inner layer 8 and the inner and outer layers 8 and 7 are separated from each other by the pressure of the fluid flowing from the second lumen 4 to make this separated space between these two layers communicate with the second lumen 4.COPYRIGHT: (C)2010,JPO&INPIT【課題】望ましい部位においてのみ薬液を投与することができ、かつ拡張体の径を小さくすることが可能な拡張カテーテルを提供する。【解決手段】第1のルーメン3および第2のルーメン4が形成されたチューブ本体2と、前記チューブ本体2の先端部に設けられ、互いに密着する内層8および外層7を備えた少なくとも2層の多層構造であり、収縮または折り畳み可能な拡張体6と、を有し、前記内層8の内部に前記第1のルーメン3が連通し、前記外層7には前記内層8と接する側から供給される薬剤を外側へ放出する放出機能が設けられ、前記第2のルーメン4からの流体圧力により前記内層8および外層7の間が剥離して当該2層間が前記第2のルーメン4と連通する。【選択図】図2
