A kind of safety needle structure of transfusion injection device,System includes the slide that a front end receives perfusion tube in conjunction with syringe needle Hou end,It provides to receive to slide in slide to limit into the hollow molded cannula of fitting what one and be formed； Wherein,Casing is made of opposite fasten of return bend body of two panels symmetric form shape,And when can detain back ontology by top tube body front end half circle cramp end,Lock set slide front end is reached in conjunction with positioning simultaneously； Thus the sliding slot for being formed tube two sides elongated recess portion,Two side flap of slide is provided to be inserted in respectively,Make to be pinched by fin and drawn towards Hou to move back,The syringe needle for enabling slide carry injection Hou is hided into Hou on the inside of casing,The convex catch point as set by slide side Hou section,By casing inner face latter end halt,Reaching, which ensures that syringe needle is hided, sets the safety of positioning in what casing and abandons effect,For its characteristic person.一種點滴注射裝置之安全針頭結構，係包括有一前端結合針頭後端延接輸液管之滑座，進入套合於一中空型套管提供滑座內接受滑行限制所組成；其中，套管由兩片對稱型狀的半形管體相對扣合組成，並可由上方管體前端一半圓形扣片末端扣回本體時，同時套鎖滑座前端達成結合定位；由此使管體兩側長型凹部形成的滑槽，提供滑座兩側翼片分別套入，使由翼片處捏拿暨朝後拉退，令滑座攜帶注射後的針頭躲入套管內側後，由滑座側面後段所設的凸狀擋點，通過套管內面末段停止點，達到確保針頭躲設於套管內定位之安全拋棄效果，為其特徵者。
