DRUG DELIVERY DEVICE WITH COMPRESSIBLE DRUG RESERVOIR

摘要

A drug delivery device (50) is provided comprising a drug reservoir(10) and a piston (11). The drug reservoir (10) is provided for comprising a drug and comprises a flexible wall (22) and a dispensing hole (15) for dispensing the drug into an environment of the drug delivery device (50). The piston (11) is provide for pressing against the flexible wall (22) to compress the drug reservoir (10) for pushing an amount of the drug through the dispensing hole (15). An adhesion interface (51) between a surface of the piston (11) and the flexible wall (22) prevents sliding between the surface of the piston (11) and the flexible wall (22).