PROBLEM TO BE SOLVED: To provide a liquid feeding knife with a tubular electrode prevented from being broken even when subjected to bending stress at a high temperature.SOLUTION: A liquid feeding knife 1 includes: a sheath 11 a support member 21 provided at the tip of the sheath 11 and formed into a cylindrical shape an axial member 12 formed of a conductive material and retractably inserted into the sheath a tubular electrode 22 connected to the axial member to project and recess through a cylinder hole 21b of the support member, provided with a duct line 22d capable of jetting forward a fluid L, and formed of a conductive material to treat a biological tissue and a locking part 25 provided on the tubular electrode and locked on the support member when the axial member is moved toward the tip side with respect to the sheath to project the tubular electrode from the cylinder hole of the support member toward the tip. Assuming a position where the tubular electrode is disposed at the tip of the support member in locking the locking part on the support member, as a projection reference position T, a heat-resistant metal member 24 is provided on the outer peripheral surface of the tubular electrode in a range including the projection reference position in the axial direction.COPYRIGHT: (C)2014,JPO&INPIT【課題】高温下で曲げ応力を受けても管状電極が破断するのを抑制した送液ナイフを提供する。【解決手段】送液ナイフ1は、シース11と、シースの先端部に設けられて筒状に形成された支持部材21と、導電性材料で形成されシースに進退可能に挿通された軸状部材12と、支持部材の筒孔21bを通して突没可能なように軸状部材に接続され、流体Lを前方に噴出可能な管路22dが形成されるとともに、生体組織の処置を行うための導電性を有する材料で形成された管状電極22と、管状電極に設けられ、シースに対して軸状部材を先端側に移動させて支持部材の筒孔から管状電極を先端側に突出させたときに支持部材に係止する係止部25とを備え、支持部材に係止部を係止させたときに支持部材の先端に配置される管状電極の位置を突出基準位置Tとしたときに、管状電極の外周面には、軸線方向における突出基準位置を含む範囲に耐熱性金属部材24が設けられている。【選択図】図2
