Injection cartridge
First Claim
1. An injection cartridge of the dual-chamber type, comprising a tubular barrel which at its front end is sealed by a closure which may be penetrated by an outlet conduit for a liquid preparation from the cartridge, and at its rear end is closed by a piston which may be moved forward, and a movable transversal wall inside said barrel, said movable wall dividing the cartridge into two separate chambers, and a bypass connection between the two chambers, said bypass connection being openable by the displacement of said movable wall to permit a bypass flow of liquid between the two chambers, and characterized in that said connection between the two chambers is arranged as a modification of the surface of the interior wall of the barrel, said modification extending completely around the circumference of the interior wall and comprising a plurality of lands and grooves in said interior wall surface, said lands extending inward from the nominal interior circumference of the barrel and said grooves extending outward from said nominal interior circumference, such that a liquid flow may be arranged around the whole circumference of the movable wall.
1 Assignment
0 Petitions
Accused Products
Abstract
An injection cartridge of the dual-chamber type has a bypass connection between its two chambers which is arranged such that the interior wall of the cartridge is modified in a determined area in such a way that the movable wall between the two chambers does not seal completely against the interior wall in said area.
42 Citations
20 Claims
- 1. An injection cartridge of the dual-chamber type, comprising a tubular barrel which at its front end is sealed by a closure which may be penetrated by an outlet conduit for a liquid preparation from the cartridge, and at its rear end is closed by a piston which may be moved forward, and a movable transversal wall inside said barrel, said movable wall dividing the cartridge into two separate chambers, and a bypass connection between the two chambers, said bypass connection being openable by the displacement of said movable wall to permit a bypass flow of liquid between the two chambers, and characterized in that said connection between the two chambers is arranged as a modification of the surface of the interior wall of the barrel, said modification extending completely around the circumference of the interior wall and comprising a plurality of lands and grooves in said interior wall surface, said lands extending inward from the nominal interior circumference of the barrel and said grooves extending outward from said nominal interior circumference, such that a liquid flow may be arranged around the whole circumference of the movable wall.
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16. An injection cartridge of the dual-chamber type, comprising:
a tubular barrel which at its front end is sealed by a closure which may be penetrated by an outlet conduit for a liquid preparation from the cartridge, at its rear end is closed by a piston which may be moved forward, and a movable transverse wall inside said barrel, said movable wall dividing the cartridge into two separate chambers, and a bypass connection between the two chambers, said connection being openable by the displacement of said movable wall to permit a bypass flow of liquid between the two chambers, and characterized in that said connection between the two chambers is arranged as a modification of the interior surface of the wall of the barrel along a determined area, such that said movable wall does not seal completely against said interior wall of the barrel within said area. - View Dependent Claims (17, 18, 19, 20)
Specification