PROBLEM TO BE SOLVED: To provide a catheter that prevents an unnecessary stress from being applied to living tissue, and can be smoothly inserted into living tissue through a constant U-shaped puncture route even if the catheter has a reduced diameter.SOLUTION: The catheter 1 at least a part of which is inserted into living tissue, includes: a puncture needle 2 having a sharp tip end 2a an internal lumen and side holes 5 and 6 communicating with the internal lumen. The catheter has a body 3 at least a part of which is flexible. The base end of the puncture needle 2 and a tip end 3a of the body 3 are connected with each other, and the catheter has a bent shape curved from the puncture needle 2 to a part of the skeleton 3 with a substantially constant curvature radius.COPYRIGHT: (C)2013,JPO&INPIT【課題】生体組織への不要な圧迫を防止するとともに、カテーテルを細径化した場合であっても一定のU字形の穿刺ルートで円滑に生体組織に導入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、生体組織内に少なくとも一部が導入されるカテーテルであって、鋭利な最先端2aを有する穿刺針2と、内部ルーメンと、内部ルーメンと連通する側孔5,6を有し、少なくとも一部が柔軟である躯体3と、を有し、穿刺針2の基端と躯体3の先端3aとは、互いに接続されており、穿刺針2から躯体3の一部まで略一定の曲率半径で湾曲した形状を保持する。【選択図】図1
