To provide a structure of a flexible injection needle capable of prolonging the time for indwelling in a human body of a flexible injection needle (outer tube) of an indwelling needle.SOLUTION: In the structure of the indwelling needle, there is provided an injection needle fitting base 1, a flexible injection needle (outer tube) 2 and a parylene layer 3, and the injection needle fitting base 1 is provided with a delivery space therein, A rigid injection needle is inserted from the hard injection needle connection port 13 with a large hole diameter toward the small-diameter flexible injection needle connection port 12 at the other end and fitted and coupled, and the flexible injection needle and the injection needle fitting base Mate and join together. The parylene layer is formed on the surface of the flexible injection needle in a CVD process by pyrolysis, and the parylene layer greatly enhances the antimicrobial and anti-inflammatory effect of the flexible injection needle.BACKGROUND OF THE INVENTION【課題】留置針の軟性注射針(外筒)の人体内に留置する時間を延長できる軟性注射針の構造を提供する。【解決手段】留置針の構造において、注射針嵌合台1、軟性注射針(外筒)2及びパリレン層3を備え、該注射針嵌合台1は内部に納置空間を設けて一端の広孔径の硬性注射針連接口13から他端の小口径の軟性注射針連接口12に向けて硬性注射針を挿入して嵌合し結合し、該軟性注射針は該注射針嵌合台と相互に嵌合して結合する。該パリレン層は、該軟性注射針の表面に熱分解によるCVD工程で形成し、該パリレン層に拠って、該軟性注射針の抗菌及び抗炎症効果を大幅に高める。【選択図】図1
