The present creation discloses a disposable safety syringe that has a needle hub having an accommodating space therein for various purposes. More specifically, the present creation provides a needle hub, configured to an end of a barrel, wherein the needle hub comprises an internal needle, an external needle and a hub body. The hub body has an accommodating space formed therein, the internal needle is configured at a proximal end of the hub body, the external needle is configured at a distal end of the hub body, the internal needle and the external needle are connected to the accommodating space for various purposes. Furthermore, the present application further provides a multi-stage protector for avoiding needle prick accidents.本創作揭示一種拋棄式之安全注射器,其具有注射針轂,而注射針轂內具有用於各種目的之容置空間。更明確地,本創作提供一種注射針轂,其設置在針筒之一端,其中注射針轂包含內針頭、外針頭以及轂本體。轂本體具有形成於其中之容置空間。內針筒設置在轂本體之近端,外針頭設置在轂本體之遠端。內針頭與外針頭連接至用於各種目的之容置空間。另外,本創作更提供一種多階段之保護套管,以避免針頭刺傷之意外。1‧‧‧注射器10‧‧‧針筒12‧‧‧第一開口14‧‧‧第二開口16‧‧‧筒體18‧‧‧突起20‧‧‧插桿22‧‧‧桿體24‧‧‧按壓環體26‧‧‧接觸部30‧‧‧注射針轂32‧‧‧內針頭34‧‧‧外針頭40‧‧‧保護套管42‧‧‧凹槽421‧‧‧線性表面422‧‧‧滑動部424‧‧‧固定部426‧‧‧隧道部50‧‧‧密封筒52‧‧‧滑動端54‧‧‧輸出端56‧‧‧活塞60‧‧‧拉柄62‧‧‧本體64‧‧‧環體66‧‧‧耳狀體
