DRIVE MECHANISM OF A DRUG DELIVERY DEVICE

摘要

Drive Mechanisnn of a Drug Delivery Device The present invention relates to a drive mechanism of a drug delivery device for dispensing of a dose of a medicament, the mechanism comprising: —a housing (30) extending in an axial direction (1, 2), —a piston rod (90) to operably engage with a piston (16) of a cartridge (14) to displace the piston (16) in an axial distal direction (1), a last dose sleeve (100) rotatably supported in the housing (30) and being selectively engageable with a dose setting mechanism for setting of a dose, —a last dose member (105) threadedly engaged to the housing (30), rotatably locked to the last dose sleeve (100) and axially displaceable relative to the last dose sleeve (100).