Patent ID: 7104971
Filing Date: 2006-09-12
Classification: A61M

Abstract:
1. A pressure chamber and storage chamber combination to be used for jet injection of a liquid medicine, comprising (a) a pressure chamber including 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 the liquid, the pressure chamber being of sufficient strength to sustain the pressure of liquid from a high pressure source, wherein said pressure barrel is provided with an open rear end adapted to receive a storage chamber for the liquid or the liquid precursor components; and (b) a storage chamber, including a storage barrel with at least a section of substantially constant cross-section, defining a storage chamber axis, at least one front sealer or piston and at least one rear sealer or piston, the pistons being inserted in the storage barrel and enclosing a liquid or liquid precursor components, wherein the pressure chamber and storage chamber are adapted to be interconnected with the pressure chamber axis and the storage chamber axis in substantially co-axial relationship, the pressure barrel and storage barrel have substantially similar internal diameters, and the pressure chamber has a sufficient volume for accommodation of substantially all liquid transferred from the storage chamber.