Abstract: An injection device (110) comprises a housing (112) adapted to receive a syringe (116) having a discharge nozzle (118) and dispensing piston (114) movable in the syringe to expel the contents of the syringe through the discharge nozzle. There is also a drive (130) adapted to act on the syringe to advance it from a retracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from housing. A drive coupling (134) extends from the drive to the dispensing piston of the syringe so as to transfer movement of the drive to the piston. The drive coupling comprises a fixed-length drive-coupling and an interchangeable drive coupling. There is also a method of manufacturing an injection device by assembling a first sub-assembly (210) and second sub-assembly (220).

Abstract: An injection device 110 is described having a housing 112 and a housing closure means 130. The injection device 110 houses a syringe 114 having a needle 118 which is sealed by a boot 117. The housing closure means 130 is arranged so that the boot 117 can be connected to the housing closure means 130 simply, but cannot be removed from the housing closure means 130. The housing 112 and housing closure means 130 are arranged so that upon rotation of the housing closure means 130, the housing closure means 130 member first rotates relative to the housing and then moves away from the housing. The injection device is simple to use and manufacture.

Abstract: An injection device (110) comprises a housing (112) adapted to receive a syringe (116) having a discharge nozzle (118) and dispensing piston (114) movable in the syringe to expel the contents of the syringe through the discharge nozzle. There is also a drive (130) adapted to act on the syringe to advance it from a retracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from housing. A drive coupling (134) extends from the drive to the dispensing piston of the syringe so as to transfer movement of the drive to the piston. The drive coupling comprises a fixed-length drive-coupling and an interchangeable drive coupling. There is also a method of manufacturing an injection device by assembling a first sub-assembly (210) and second sub-assembly (220).