MEDICATION DELIVERY DEVICE WITH SPRING TO CUSHION PISTON RECOIL

摘要

A medication delivery device (1) comprises a housing (4) having a proximal end (P) and a distal end (D), a cartridge (3) for holding a medication (M), the cartridge having an outlet (3'), a moveable piston (5) being retained within the cartridge, a drive member (17) moveable in a proximal direction with respect to the housing for setting a dose of medication to be delivered and in the distal direction with respect to the housing for delivering the dose and a piston rod (10) adapted to drive the piston in a distal direction with respect to the cartridge for delivering the dose. The drive member is releasably coupled to the piston rod. The medication delivery device further comprises a resilient member (21 ) which is arranged to move the drive member in the proximal direction with respect to the housing after dose delivery, thereby reducing pressure of the piston rod on the piston.