PROBLEM TO BE SOLVED: To provide a drug administration needle that can smoothly adminiostrate a drug regardless of degrees of stiffness of the tissue of a living body as an administration target.SOLUTION: The drug administration needle 1 includes: an elongate outer cylinder 2 having a lumen 4 inside an end portion 7 where a pointed stick portion 6 is formed and an elongate shaft portion 8 located on a proximal end side that is away from the end portion 7. At least the elongate shaft portion 8 includes: an inner needle 3 that is movably inserted into the lumen 4 of the outer cylinder 2 in a shaft direction and whose entire length is longer than the outer cylinder 2 and a drug infusion port 10 for infusing the drug into a space 41 between the inner surface of the outer cylinder 2 and the shaft portion 8 of the inner needle 3.COPYRIGHT: (C)2012,JPO&INPIT【課題】薬剤投与対象の生体組織の硬さによらず円滑に薬剤を投与することができる薬剤投与針を提供すること。【解決手段】本発明にかかる薬剤投与針1は、内部にルーメン4を有する細長い外筒2と、尖った穿刺部6が先端に形成された先端部7と先端部7より基端側に位置する細長い軸部8とを有し、少なくとも軸部8が外筒2のルーメン4内部に軸方向に移動可能に挿通され、全長が外筒2より長い内針3と、外筒2の内側面と内針3の軸部8との間の空間41に薬剤を供給する薬剤注入口10と、を備える。【選択図】図2
