PROBLEM TO BE SOLVED: To provide a dialysis catheter excellent in both insertion and pulling-off properties and blood exchange efficiency and capable of preventing the stagnation or the like of blood causing the formation and adhesion of a thrombus.SOLUTION: This dialysis catheter 1 includes a catheter body 11 and a closure member 31. The catheter body 11 has the first lumen 16b communicating with the tip-end hole 22 thereof and the second lumen 16a communicating with the side hole 23 thereof. The closure member 31 has a shape diametrically contracted and inclined on a tip-end side to close a tip-end opening part 36. The side hole 23 is the slot extending in the long-axis direction A3 of the catheter and, on the basis of the outer diameter D1 of the side hole 23, a long diameter d1 is 1.5 times or above and a short diameter d2 is 0.5-0.9 times. The angles θ1 and θ2 formed by the opening edges 24 and 25 on the tip-end and base-end sides of the side hole 23 and the long-axis direction A3 of the catheter is 35° or below. The base-end side 31b of the closure member 31 reaches the certain position of the side hole 23 to seal the region on the tip-end side. The base-end surface 33a is formed along the shape of the opening surface on the tip-end side of the side hole 23.COPYRIGHT: (C)2013,JPO&INPIT【課題】挿抜性及び血液交換効率の両方に優れ、血栓の形成及び付着の原因となる血液の滞留等を防止できる透析用カテーテルを提供する。【解決手段】本発明の透析用カテーテル1は、カテーテル本体11と閉塞部材31とを備える。カテーテル本体11は、先端孔22に連通する第1ルーメン16b及び側孔23に連通する第2ルーメン16aを有する。閉塞部材31は、先端側が縮径傾斜した形状をなし先端開口部36を閉塞する。側孔23は、カテーテル長軸方向A3に延びる長孔である。側孔23は外径D1を基準として長径d1が1.5倍以上、短径d2が0.5倍以上0.9倍以下である。側孔23の先端側開口縁24及び基端側開口縁25とカテーテル長軸方向A3とがなす角度θ1,θ2が35°以下である。閉塞部材31の基端側31bは、側孔23のある位置に到って先端側領域を封止する。基端面33aは側孔23の先端側開口面の形状に沿った形状をなす。【選択図】図5
