The invention relates to: A portable medication delivery device (1) comprising a medication cartridge (11) having an outlet (111) and a movable piston (112), and a housing (12) for holding said cartridge, and a flexible piston rod (13) being operable to engage and displace said piston along an axis (113)...http://www.google.com/patents/US20020091358?utm_source=gb-gplus-sharePatent US20020091358 - Medication delivery device with bended piston rod
