A kind of safeguard protection syringe,The needle cylinder device include at least a protective cover unit,One pivot pole unit and a needle unit； Wherein,The protective cover unary system is a hollow sleeve needle tray,Set needle tray Hou end is an extension,Extension Hou end sets a pivot hole； The tube unit,System is a hollow tube； The pivot pole unit system is located at the hollow tube periphery of tube unit,Its tube unit can cover on the cylinder of the various differences of solid what,And its front end is equipped with single order level segment and fixes for needle unit,And when being inserted in tube unit,The pivot pole unit is suitable to be articulated for the protective cover unit Hou end pivot hole,Pivot the protective cover unit by good positioning； Thereby,In the case where being not necessarily to change the principle of original cylinder and needle head structure,One, which can be constituted, can make protective cover unit pivot and will be buckled into safeguard protection cover unit with the syringe needle of complete syringe,To ensure that syringe uses upper safety.一種安全保護針筒，該針筒裝置至少包含一保護蓋體單元、一樞柱單元及一針頭單元；其中，該保護蓋體單元係為一中空套針槽，套針槽後端為一延伸部，延伸部後端設一樞孔；該套管單元，係為一中空管體；該樞柱單元係設在套管單元之中空管體外周，其套管單元可套固於各種不同之筒體上，且其前端設有一階級段可供針頭單元固定，並使套管單元套入時，該樞柱單元適可供該保護蓋體單元後端樞孔樞接在一起，因而使該保護蓋體單元受到良好之定位樞轉；藉此，在無需變更原有筒體及針頭結構之原則下，即能構成一可使保護蓋體單元樞轉而將用畢針筒之針頭扣入安全保護蓋體單元內，以確保針筒使用上之安全。
