This creation is that a kind of needle chemicals dosing plant of exempting from of related drop syringe is improved,In the state of when what progress liquid medicine injection,The head system of syringe pushes towards anti-reverse piece of upper section,Be stacked by anti-reverse piece of what of upper section by a plurality of second groove rings formed,Lower section be stacked by a plurality of first groove rings formed,The factors such as the wall thickness of second side of the thin what upper section of the wall thickness system of the first side of upper section,Make upper section that can be compressed and be tilted easily towards the direction of the first side,Lower section can also be compressed easily simultaneously,Anti-reverse piece is set to generate gap between upper shield,And the permeable gap of medical fluid system,Fluid hole,Confession fluid apertures,And it flow to infusion and is in charge of； Not only structure is simplified,And operation when liquid medicine injection is simple,Without using syringe needle,It is more avoidable to stab nursing staff.本創作係有關一種點滴注射器之免針加藥裝置改良，於進行注射藥液時的狀態下，針筒之頭部係朝防逆塊之上段推壓，由於防逆塊的上段係由複數個第二凹槽環所疊置形成、下段係由複數個第一凹槽環所疊置形成、上段的第一側之壁厚係薄於上段的第二側之壁厚等因素，使上段可輕易被壓縮並朝第一側的方向傾斜，同時下段亦可輕易地被壓縮，使防逆塊與套蓋之間產生空隙，而藥液係可透過空隙、出液孔、供液孔，而流至輸液分管；不但結構精簡，而且注射藥液時的操作簡易，而不需要使用到針頭，更可避免刺傷護理人員。
