A syringe is presented, which comprises a tube, a first plug, a second plug and a tappet assembly. One end of the tube forms a nozzle while the other end of the tube receives a sealed cap. The first plug and the second plug are set in the tube. A first chamber is created between the nozzle and the first plug while a second chamber is created between the first plug and the second plug. The first plug has a stuffed portion penetrates through the first plug. The second plug has a connected hole. The tappet assembly includes a rod and a bung. One end of the rod forms a neck and at least one fixed portion. The bung connects to the neck. The bung is stuffed in the stuffed portion of the first plug or deviates from the first plug by pulling the rod and makes the rod integrate into the second plug thereafter by integrating the fixed portion into the connected hole.一種注射器,係包含:一注射筒,一端形成一注射端,另一端結合一封蓋;一第一隔塞,設置於該注射筒中,該第一隔塞與該注射端之間形成一第一容室,該第一隔塞設有一塞合部,該塞合部軸向貫穿該第一隔塞;一第二隔塞,設置於該注射筒中,該第二隔塞與該第一隔塞之間形成一第二容室,該第二隔塞設有一固接孔;及一推桿組,包含一桿體及一塞塊,該桿體之一端形成一頸部及至少一卡掣部,該塞塊設置於該頸部一端,該塞塊可塞置於該第一隔塞之塞合部,並可隨該桿體移動而脫離該第一隔塞,而以該桿體之卡掣部結合固定於該第二隔塞之固接孔。1...注射筒11...注射端12...封蓋121...穿孔122...凹陷部123...結合部13...結合部14...第一容室15...第二容室2...第一隔塞21...塞合部211...擋止面212...內凸環3...第二隔塞31...固接孔311...反鉤部32...穿置孔4...推桿組41...桿體411...頸部412...卡掣部413...溝槽414...接合部42...塞塊43...輔助推桿431...接合部432...握持部5...封塞6...第一劑6’...第二劑
