PROBLEM TO BE SOLVED: To provide an electrode catheter which securely prevents blood from entering a lumen of a catheter tube as tip deflecting operation is performed.SOLUTION: The electrode catheter includes: a tube member 10 having a tip flexible part ring-shaped electrodes 32 fixed to an outer peripheral surface of the tip flexible part of the tube member 10 apart from one another a tension wire 50 extending eccentrically with the lumen of the tube member 10 and lead wires 42 connected to the ring-shaped electrodes 32 respectively. Side holes 15 for making the lead wires 42 enter the lumen are formed in a tube wall of the tip flexible part of the tube member 10, the ratio of the diameter (d) of the side hole 15 to the electrode width (w) of the ring-shaped electrode 32 is 0.3-1.0, and the angle (&alpha) formed between the eccentricity direction of the tension wire 50 and the straight line connecting a center axis (O) of the tube member 10 and the center of a side hole 15 is equal to or less than 100°.COPYRIGHT: (C)2012,JPO&INPIT【課題】先端偏向操作に伴ってカテーテルチューブのルーメンに血液が浸入することを確実に防止できる電極カテーテルを提供すること。【解決手段】先端可撓部分を有するチューブ部材10と、チューブ部材10の先端可撓部分の外周面に各々が離間して固定されたリング状電極32と、チューブ部材10のルーメンに偏心して延在する引張ワイヤ50と、リング状電極32の各々に接続されたリード線42とを備えてなり;チューブ部材10の先端可撓部分の管壁には、リード線42をルーメンに進入させるための側孔15が形成され、リング状電極32の電極幅(w)に対する側孔15の直径(d)の比率(d/w)が0.3~1.0であり、引張ワイヤ50の偏心方向と、チューブ部材10の中心軸(O)と側孔15の中心を結ぶ直線とのなす角度(α)が100°以下である。【選択図】 図2
