PROBLEM TO BE SOLVED: To provide a catheter capable of enhancing treating effect by changing a medicine administrative area corresponding to the progression of a necrosis even without doing frequent diagnoses and discharging outlet changing operation.SOLUTION: The catheter 1 has an elongate skeleton part 2 having a lumen, and a plurality of blanching parts 3 having sub lumens of which base ends is connected to the skeleton part 2 and which are in communication with the lumen of the skeleton part 2 respectively, openings 4 in communication with the sub lumens, and biased such that front ends spread. The force biasing the branching parts 3 is weaker than the force needed for the front ends of the branching parts 3 to spread while deforming a living tissue but is greater than the force needed for the front ends of the branching parts 3 to spread in the cavity in the living tissue or in the flowing body.COPYRIGHT: (C)2012,JPO&INPIT【課題】頻繁な診断および吐出口変更作業を行わなくとも、ネクローシスの進行に対応させて薬剤投与領域を変更して治療効果を向上できるカテーテルを提供すること。【解決手段】本発明にかかるカテーテル1は、ルーメンを有する細長い躯体部2と、基端が躯体部2につながり、各々が躯体部2のルーメンと連通するサブルーメンと、サブルーメンと連通する開口4とを有し、先端が広がるように付勢された複数の分岐部3と、を備え、分岐部3を付勢する力は、生体組織を変形させて分岐部3の先端が広がるのに必要な力より弱く、生体組織内の空洞あるいは流状体内で分岐部3の先端が広がるのに必要な力より大きい。【選択図】図1
