A syringe (100) for the injection of an injectable solution contained in a deformable cartridge (1), wherein the syringe (100) comprises:- a main body (101) provided with a receiving compartment (106) for receiving the deformable cartridge (1), wherein the main body extends between a first end portion (102), where a first opening (103) is present, and an opposed second end portion (104), where a second opening (105) is present；- a crushing device (200) comprising a plunger (200) sliding with respect to the main body (101) between a retracted position and an advanced position and bearing a crushing head (201) sliding with respect to the main body (101) inside the receiving compartment (106) for deforming, in particular crushing, the deformable cartridge (1)；- a support and fixing element (120) of the sliding plunger (200) to which the plunger (200) is slidably constrained；- coupling means for removably coupling the support and fixing element (120) to the main body (101) and/or which enable the support and fixing element (120) to be coupled to the main body (101) so as to change a mutual position between the support and fixing element (120) and the main body (101).一種用於注射包含在可變形藥筒(1)中的可注射溶液的注射器(100)，其中該注射器(100)包含：-一主體(101)，該主體具有用於接收該可變形藥筒(1)之接收隔室(106)，其中該主體在存在第一開口(103)之第一末端部分(102)與存在第二開口(105)之相反第二末端部分(104)之間延伸；-一擠壓裝置(200)，該擠壓裝置包含柱塞(200)，該柱塞在回縮位置與前進位置之間相對於該主體(101)滑動，且該擠壓裝置攜帶擠壓頭端(201)，該擠壓頭端在該接收隔室(106)內相對於該主體(101)滑動以使該可變形藥筒(1)變形，特定言之擠壓該可變形藥筒；-該滑動柱塞(200)之支撐及固定元件(120)，該柱塞(200)可滑動地約束至該支撐及固定元件；-耦接構件，該耦接構件用於將該支撐及固定元件(120)可移除地耦接至該主體(101)及/或使得該支撐及固定元件(120)能夠耦接至該主體(101)，以便改變該支撐及固定元件(120)與該主體(101)之間的相互位置。
