Patent ID: 6740062
Filing Date: 2004-05-25
Classification: A61M

Abstract:
An injector device for delivery of liquid from a high pressure source, the device comprisinga) a pressure chamber comprising a pressure barrel of substantially constant cross-section, defining a pressure chamber axis, adapted for accommodation of at least one piston therein and having a front end opening for ejection of liquid, the pressure chamber being of sufficient strength to sustain the pressure of liquid from a high pressure source and being empty or filled with gas; b) a storage chamber, for liquid or liquid precursor components, comprising a storage barrel with at least a section of substantially constant cross-section, defining a storage chamber axis, adapted for accommodation of at least one piston therein, optionally with a by-pass section therein; c) a liquid connection between the pressure chamber and the storage chamber adapted to allow transfer of liquid from the storage chamber to the pressure chamber; d) at least a first piston arranged for travel in the pressure barrel; and e) a mechanism adapted to apply force, directly or indirectly, on the piston when in the pressure barrel to create said liquid pressure; wherein i) the pressure chamber axis and the storage chamber axis substantially coincide; ii) the pressure barrel and storage barrel have internal diameters sufficiently similar to allow passage of a resilient piston from the storage barrel to the pressure barrel in a sealing manner, except when in the optional by-pass or the connection, and (iii) the storage chamber is separate from the pressure chamber.