PROBLEM TO BE SOLVED: To provide an electrode catheter including an irrigation mechanism that does not cause an abnormal temperature rise at a part of the distal end electrode in cauterization, that exhibits an excellent cooling effect on the surface of the distal end electrode and an excellent effect of preventing the formation of a thrombus on the surface of the distal end electrode, and that can perform efficient cauterization treatment.SOLUTION: An electrode catheter includes: a shaft 10 having a lumen 11 serving as a fluid passage an irrigation member 20 and a distal end electrode 30. A plurality of irrigation openings 25A for supplying liquid, which is supplied from the shaft 10, to the surface of the distal end electrode 30 are provided in the irrigation member 20 at equal angular intervals. The distal end of the irrigation member 20 has formed therein liquid guide grooves 26 respectively extending from the irrigation openings 25A toward the distal end. The distal end electrode 30 has a spherical distal end section 31 including a maximum-diameter section 39 and also has a proximal end section 32. Liquid guide grooves 36 are formed in the surface of the distal end electrode 30, and the liquid guide grooves 36 respectively continue to the guide grooves 26 in the irrigation member 20 and extend toward the distal end until the liquid guide grooves 36 reach at least the maximum-diameter section 39.COPYRIGHT: (C)2014,JPO&INPIT【課題】焼灼時に先端電極の一部に異常な温度上昇を生じることがなく、先端電極表面の冷却効果および先端電極表面における血栓の形成抑制効果に優れ、しかも、効率的な焼灼治療を行うことができる、灌注機構を備えた電極カテーテルを提供すること。【解決手段】液体流路となるルーメン11を有するシャフト10と、灌注部材20と、先端電極30とを備えてなり、灌注部材20には、シャフト10から供給される液体を先端電極30の表面に灌注するための複数の灌注用開口25Aが等角度間隔に配置され、灌注部材20の先端部には、灌注用開口25Aの各々から先端方向に延びる液体の案内溝26が形成され、先端電極30は、最大径部39を含む球状先端部31と、基端部32とを有し、先端電極30の表面には、灌注部材20の案内溝26の各々に連続して、少なくとも最大径部39に至るまで先端方向に延びる液体の案内溝36が形成されている。【選択図】 図8
