Patent ID: 6213980
Filing Date: 2001-04-10
Classification: A61M

Abstract:
A unit dose injection cartridge comprising:a sidewall structure defining an elongated medicament chamber;a sealable discharge outlet at a distal end of said medicament chamber;a discharge piston seal slidable within the chamber from a proximal end region to a distal end region thereof, said piston seal being removably securable at a first position within the proximal end region;a passageway extending, while said piston seal is in said first position, past the plunger from a proximal side to a distal side thereof, the chamber being fillable with medicament by way of the passageway, wherein:during filling, air is allowed to escape from the chamber; andthe piston seal is movable distally to a second position within the proximal end region, after filling of the chamber, to thereby seal-off the chamber from the passageway.