An apparatus, comprising: a housing (1100, 4100) defining a gas chamber (1139, 4139); an energy storage member (2410, 4410) disposed within the housing, the energy storage member (2410, 4410) being configured to supply a pressurized gas to the gas chamber (1139, 4139) of the housing (1100, 4100); and a carrier (1360, 4360), the carrier (1360,4360) being configured to be movably disposed within the housing (1100, 4100), and the carrier (1360, 4360) being configured to be coupled to a medicament container (1200, 4200); characterized in that, the apparatus comprises an expandable assembly, a side wall (1110, 4110) of the housing defines an opening (1112, 4112) configured to selectively place the gas chamber (1139, 4139) in fluid communication with an exterior volume; a proximal surface (1376, 4376) of the carrier (1360, 4360) defines a portion of a boundary of the gas chamber, the expandable assembly (1310, 4310) includes a first member (1320, 4320) and a second member (1340, 4330), the first member (1320, 4320) being coupled to an elastomeric member (1217, 4217) disposed within the medicament container, the second member (1340, 4330) including a valve portion 1345, 4345), and the expandable assembly (1310, 4310) is configured to transition from a collapsed configuration to an expanded configuration when the elastomeric member (1217, 4217) moves within the medicament container (1200, 4200) via a force from the pressurized gas, the valve portion (1345, 4345) configured to move relative to the opening when the expandable assembly (1310, 4310) transitions from the collapsed configuration to the expanded configuration to place the gas chamber (1139, 4139) in fluid communication with the exterior volume. a housing (1100, 4100) defining a gas chamber (1139, 4139); an energy storage member (2410, 4410) disposed within the housing, the energy storage member (2410, 4410) being configured to supply a pressurized gas to the gas chamber (1139, 4139) of the housing (1100, 4100); and a carrier (1360, 4360), the carrier (1360,4360) being configured to be movably disposed within the housing (1100, 4100), and the carrier (1360, 4360) being configured to be coupled to a medicament container (1200, 4200); characterized in that, the apparatus comprises an expandable assembly, a side wall (1110, 4110) of the housing defines an opening (1112, 4112) configured to selectively place the gas chamber (1139, 4139) in fluid communication with an exterior volume; a proximal surface (1376, 4376) of the carrier (1360, 4360) defines a portion of a boundary of the gas chamber, the expandable assembly (1310, 4310) includes a first member (1320, 4320) and a second member (1340, 4330), the first member (1320, 4320) being coupled to an elastomeric member (1217, 4217) disposed within the medicament container, the second member (1340, 4330) including a valve portion 1345, 4345), and the expandable assembly (1310, 4310) is configured to transition from a collapsed configuration to an expanded configuration when the elastomeric member (1217, 4217) moves within the medicament container (1200, 4200) via a force from the pressurized gas, the valve portion (1345, 4345) configured to move relative to the opening when the expandable assembly (1310, 4310) transitions from the collapsed configuration to the expanded configuration to place the gas chamber (1139, 4139) in fluid communication with the exterior volume.