Patent ID: 6569126
Filing Date: 2003-05-27
Classification: A61M

Abstract:
A cylinder ampoule comprising: a tubular vessel having a first end, a second end, and an inner wall; a membrane for sealing and closing the first end of the vessel; a piston having a first and second end, the piston closing the second end of the vessel so that a liquid can be stored in the vessel between the first end of the piston and the membrane and can be pressed out through an injection needle inserted through the membrane when the piston is forced into the tubular vessel; wherein the tubular vessel is made from a plastically deformable material; and further comprises a spring plate made of a material harder than the material of the vessel and a pressure foot, wherein the spring plate is carried by the pressure foot and is mainly perpendicular to the longitudinal axis of the vessel; and wherein the spring plate has at least one diameter that is larger than the diameter of the vessel inner wall so that edges of the plate abut tile inner wall of the vessel and are deflected away from the piston to form an acute angle with the inner wall; and wherein the spring plate is split up to engage the vessel inner, wall in a number of circumferentially spaces, points, or zones.