The needle protection instrument of this invention as for (2), the protector backing (20) with, the needle protector of mobility (22) with, the aforementioned protector backing (20) with the needle protector (22) with the compressed spring which is provided between (24) with, the compressed spring (24) opposing to action in first stage, the needle protector (22) the expedient which is kept (38,40,54) it includes, the aforementioned expedient (38,40,45) it becomes release possible the protector backing (20) the needle protector for (22) depending upon the movement to release direction. This device is operation possible the needle protector (22) edge opening (60) with the action of the needle protective cap which is engaged, the needle protector which becomes invalid depending upon the release of the needle protective cap (22) mechanical expedient in order person in charge stopping to do (45,62) furthermore it includes.本発明の針保護装置(2)は、プロテクタ支持体(20)と、可動の針プロテクタ(22)と、前記プロテクタ支持体(20)と針プロテクタ(22)との間に設けられた圧縮ばね(24)と、初期に圧縮ばね(24)の作用に対抗して針プロテクタ(22)を保持する手段(38,40,54)を含み、前記手段(38,40,45)はプロテクタ支持体(20)に対する針プロテクタ(22)の解放方向への移動によって解放可能になる。この装置は、針プロテクタ(22)の端開口(60)に係合した針保護キャップの作用によって作動可能であり、針保護キャップの解放によって非作動となる針プロテクタ(22)を係止するための機械的手段(45,62)を更に含む。
