A drug delivery system includes a container having proximal and distal ends and a rapidly openable divider, replaceably disposed within the container to separate the container into a proximal chamber that is selectively gas impermeable and able to receive a pressurized gas and a distal chamber having...http://www.google.fr/patents/US5947928?utm_source=gb-gplus-shareBrevet US5947928 - Drug delivery system
