Medication delivery device and method for operating a medication delivery device

摘要

A medication delivery device comprises a housing having a proximal end (P) and a distal end (D), a cartridge for holding a medication (M), the cartridge having an outlet, a moveable piston being retained within the cartridge, a drive member moveable in a proximal direction with respect to the housing for setting a dose of medication (M) to be delivered and in the distal direction with respect to the housing for delivering the dose and a piston rod 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 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.

主权项

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