Method of producing a drug delivery device

Method of producing a drug delivery device comprising

• a prefilled drug container,
• a fluidic pack including a liquid flow system providing a fluidic connection from the drug container to a patient during a drug delivery action of the drug delivery device
• a drive unit comprising electronic parts and a pump drive,
• a housing,
• the method comprising the following steps
• a) assembling components of the fluidic pack to form said fluidic pack,
• b) sterilizing the fluidic pack,
• c) providing said prefilled drug container,
• d) assembling the fluidic pack after sterilization to the prefilled drug container to form a container pack system,
• e) assembling the container pack system to the drive unit and the housing to form the drug delivery device,
• characterized in that the fluidic pack includes a container casing for receiving therein the prefilled drug container, and a pump engine having a rotor comprising a coupling interface adapted for coupling to the pump drive for providing torque to the rotor, wherein the coupling interface is sealed by a sealing membrane to maintain sterility after step b), and in that steps c) and d) are performed in aseptic conditions.