This creation is a kind of syringe,To combine flask for medicinal preparations and syringe needle to use,The syringe include outer protecting shell,Engagement collar,Medicine bottle sheath body,Inner sleeve,Bidirectional screw guide wire group,Be spirally connected ring,Single direction ratchet,Spiral handspike and injection putter group,Engagement collar sets what outer protecting shell front end,And flask for medicinal preparations is set in conjunction with medicine bottle sheath body group,Inside outer protecting shell group set inner sleeve,Bidirectional screw guide wire group,Be spirally connected ring,Single direction ratchet,Spiral handspike and injection putter group etc.,Injection putter group directly can be drawn to quick Hou,It is directly injected again to pressing injection putter group,And constructed using the big screw pitch stroke of bidirectional screw guide wire group,The fine pitch stroke arranged in pairs or groups between bolted joint and spiral handspike constructs,Spinning force directly will be converted to pressing strength,It converts in conjunction with big stroke rotary thrust to the injection thrust of small stroke rotation,The purpose of calibrated shot medicament is reached,And the effect of laborsaving, is reached with the simplicity mode of operation of circulating open close.本創作是一種注射器，用以結合藥劑瓶與針頭使用，該注射器包含外護殼、接合套環、藥瓶套殼、內套管、雙向螺旋導引管組、螺接環、單向棘輪、螺旋推桿與注射推桿組，接合套環設於外護殼前端，並結合藥瓶套殼組設藥劑瓶，外護殼內部組設內套管、雙向螺旋導引管組、螺接環、單向棘輪、螺旋推桿與注射推桿組等，使其能直向快速後拉注射推桿組，再直向按壓注射推桿組注射，並利用雙向螺旋導引管組之大螺距行程構造，搭配螺接頭與螺旋推桿間之小螺距行程構造，將直向按壓力量轉換為旋轉力量，結合大行程旋轉推力轉換至小行程旋轉之注射推力，使其達到定量注射藥劑之目的，且以循環開閉之簡便操作方式達到省力之功效。
