A method and system for retaining a drug cartridge (1001, 216, 300, 402, 452, 502, 552, 704, 724, 744, 764, 784) in a cartridge holder (1002, 1008, 154, 202, 302, 400, 450, 700, 720, 740, 760, 780). As an example, a retaining member (1003, 1007, 150, 200, 250, 304, 320, 330, 340, 410, 454, 702, 722, 742, 762, 782) for retaining a drug cartridge (1001, 216, 300, 402, 452, 502, 552, 704, 724, 744, 764, 784) in a cartridge holder (1002, 1008, 154, 202, 302, 400, 450, 700, 720, 740, 760, 780) includes at least one connection feature (204) for connecting to the drug cartridge (1001, 216, 300, 402, 452, 502, 552, 704, 724, 744, 764, 784). The at least one connection feature (204) is on an outer wall of the retaining member (1003, 1007, 150, 200, 250, 304, 320, 330, 340, 410, 454, 702, 722, 742, 762, 782). The retaining member (1003, 1007, 150, 200, 250, 304, 320, 330, 340, 410, 454, 702, 722, 742, 762, 782) further includes at least one retention feature (129, 208, 210, 252, 254, 1006), and this at least one retention feature (129, 208, 210, 252, 254, 1006) extends from an inner wall of the retaining member(1003, 1007, 150, 200, 250, 304, 320, 330, 340, 410, 454, 702, 722, 742, 762, 782). When the retaining member (1003, 1007, 150, 200, 250, 304, 320, 330, 340, 410, 454, 702, 722, 742, 762, 782) is connected to the cartridge holder (1002, 1008, 154, 202, 302, 400, 450, 700, 720, 740, 760, 780), the retaining member (1003, 1007, 150, 200, 250, 304, 320, 330, 340, 410, 454, 702, 722, 742, 762, 782) retains the drug cartridge (1001, 216, 300, 402, 452, 502, 552, 704, 724, 744, 764, 784) in the cartridge holder (1002, 1008, 154, 202, 302, 400, 450, 700, 720, 740, 760, 780).Linvention porte sur un procédé et sur un système pour maintenir une cartouche de médicament (1001, 216, 300, 402, 452, 502, 552, 704, 724, 744, 764, 784) dans un support de cartouche (1002, 1008, 154, 202, 302, 400, 450, 700, 720, 740, 760, 780). À titre dexemple, un élément de maintien (1003, 1007, 150, 2
