PROBLEM TO BE SOLVED: To avoid thermal damage to a puncture needle and a fiber, and an explosion in a body tissue in a laser treatment device for performing treatment by irradiating a laser beam to an affected tissue which is a lesioned part, and to provide a puncture needle at a comparatively cheap price.SOLUTION: A puncture needle 1 is composed of the three members (a) to (c), that is: (a) a first member 6 in which a grip 62 for gripping is attached to the rear end of a metal needle 61 with a pointed tip (b) a second member 7 in which a grip part 72 is attached to the rear outer peripheral part of an external cylinder 71 having a hollow part into which the needle 61 of the first member 6 is inserted and (c) a third member 8 in which a hollow adapter 82 is attached to the rear end of a metal internal cylinder 81 whose diameter is smaller than that of the external cylinder 71 of the second member 7, and a hollow body 82a for inserting a light-guiding fiber 21, an aqueous solution injection hole 86 for injecting the aqueous solution, and a steam discharge hole 87 for discharging steam are provided to the adapter 82.COPYRIGHT: (C)2016,JPO&INPIT【課題】レーザ光を病変部である患部組織に照射することにより治療を行うレーザ治療装置において、穿刺針やファイバの熱的損傷、体内組織での爆発を回避すると共に、穿刺針を比較的安価な値段で提供する。【解決手段】穿刺針1を以下の(a)~(c)の3つの部材で構成する。(a) 先端がとがった金属製の針61の後端部に把持用のグリップ62が取り付けられた第1の部材6、(b) 第1の部材6の針61を挿通する中空部を有する外筒71の後部外周部に把持部72が取り付けられた第2の部材7、(c) 第2の部材7の外筒71より直径が小さい金属製の内筒81の後端部に中空のアダプタ82が取り付けられ、アダプタ82に導光用ファイバ21挿通用の中空の本体82a、前記水溶液を注入するための水溶液注入孔86および蒸気を排出するための蒸気排出孔87が設けられた第3の部材8。【選択図】図2
