EP1365823B1 — Disposable needle-free injection apparatus and method

USPTO Abstract

One form of the invention provides a needle-free injection system including the following components: a nozzle portion (12) having a glass wall (60) defining a drug storage space (51), and an injection wall defining a drug injection space (58), the injection wall being coaxial with the glass and defining a plurality of drug bypass conduits (64) disposed adjacent a forward end of the drug injection space, an injection orifice (54) defined at the forward end of the injection space, a drug plunger (66) defining a rearward end of the storage space, a drug plug (62) initially disposed between the storage space and the injection space, and being displaceable into the injection space adjacent the bypass conduits, and a pierceable gas cartridge (102) for providing injection power to the drug plunger (66).