Systems for assembling injection devices

An apparatus for assembling an injection device including a medical cartridge and an adapter comprising a body for receiving the medical cartridge in an open end thereof, comprising:

• a pair of first shafts disposed adjacent one another, each first shaft comprising a helical groove therein extending from a first end to a second end of the first shaft;
• one or more second shafts spaced apart a predetermined distance from the pair of first shafts, the first and second shafts extending substantially parallel to a first longitudinal axis, each second shaft comprising a helical groove therein extending from a first end to a second end of the second shaft, the helical grooves in the first and second shafts having corresponding pitches such that the helical grooves define one or more passages between the first and second shafts that define a transverse axis extending transversely to the first longitudinal axis;
• and
• a drive mechanism coupled to the first and second shafts for rotating the first and second shafts such that each passage moves from the first ends towards the second ends of the first and second shafts for carrying a medical cartridge in the passage between the first and second ends while maintaining the medical cartridge substantially parallel to the transverse axis.