Yi Seed pulling-back types are Needles safe, including Yi Needles Head, a Needles and a plunger, wherein The Needles Head Department have Yi Needles Body and a Needles, The Needles Zuo Department include Needles Zuo With once Needles on one, on the fixed whats of the upper Needles Gong Needles Body of The, and Needles lower sections on lower Needles Zuo Department Move engagings whats living, upper Needles Di Bu The Let have a Title socket partsMono- Zhong Kong Tong Body of The Needles Tong Department As, front end form As Needles Head sockets, for Needles Head Cha Ru Knot conjunctions, make the Needles seat Ke Rong Satisfied what The Needles Head socket Inner of The Needles Head, and The Needles Head socket Inner Bi Let have a butting section, the Needles seats of Gong Needles Head are on whatThe plungers can be by Needles lower section Needles Inner of Tui Jin whats, the front end Let of The plungers has a piston, The Huo Sai Knot conjunctions have Needles bottoms Title socket part Title Jie Knot conjunctions portion on Yi Ke With, using makes to have injected Bi Hou, applying a strength closes Huo Sai Squeeze Pressure Change Xing Zhi Knot He Bu With Title Jie Bu Knot, and the butting sections Shi Needles Head Off From Needles Head Cha Zuo With are drawn back into the Needles portions Inner.一種回拉式安全針筒,包括一針頭、一針筒及一柱塞,其中該針頭係具有一針體及一針座,該針座係包括一上針座與一下針座,該上針座供針體固定於上,而下針座係活動卡合於上針座下方,上針座底部則設有一銜接部;該針筒係為一中空筒體,其前端形成為針頭插座,以供針頭插入結合,使該針頭之針座可容納於該針頭插座內,又該針頭插座內壁設有一抵靠部,供針頭之針座抵靠於上;該柱塞可由針筒下方推進於針筒內,該柱塞之前端設有一活塞,該活塞結合有一可與上針座底部銜接部銜接之結合部,藉以使注射完畢後,施加一力量使活塞擠壓變形至結合部與銜接部結合,而使針頭脫離針頭插座與抵靠部被拉回至針筒內部。
