Ahead the stab possible needle (2a) the needle tube which it possesses ahead the needle (2a) it makes the needle attaching medical instrument of this invention, (2) and one end extend in the living body, in the other end the needle tube (2) the basic destal (2b) the needle tube (2) it locks the intermediate section when it is made to extend with high frequency welding and the needle attaching part containment it has (5). In addition, it consists of the elastic member, the needle tube (2) the basic destal (2b) the seal component which in rim side is provided in the fluid-tight (8) with, the liquid storage section which possesses the storage possible liquid chamber (9) with it possesses the liquid inside. And, the needle tube (2) the basic destal (2b) with when the liquid chamber has been communicated, the seal component (8) being compressed the needle attaching part (5) and the liquid storage section (9) with by, narrow it has kept.本発明の針付医療器具は、生体に穿刺可能な針先(2a)を有する針管(2)と、一端に針先(2a)を突出させ、他端に針管(2)の基端部(2b)を突出させた状態で針管(2)の中間部を高周波溶着により固定して保持する針保持部(5)とを備える。また、弾性部材で構成され、針管(2)の基端部(2b)側の外周に液密に設けられたシール部材(8)と、内部に液体を収容可能な液室を有する液収容部(9)とを有する。そして、針管(2)の基端部(2b)と液室とが連通された状態で、シール部材(8)は針保持部(5)と液収容部(9)とにより圧縮されて狭持されている。
