A - Human Necessities
61
M
128/84
A61M 5/31 (2006.01)
Patent
CA 1136505
ABSTRACT The present invention relates to a syringe comprising a rotationally symmetrical barrel, a plunger, a cylindrical stopper and a needle holder. The barrel is in a shape of a hollow cylinder with an open front end. The plunger is sealably disposed within the barrel and is movable with respect thereto, the cylindrical stopper has an outside diameter which is slightly larger than an inside diameter of the barrel and includes means which seal the front end of the barrel. The needle holder includes a collar which is attached in sealing relationship to the front end of the barrel, a neck for sealable attachment to an injection needle, the neck having a rotationally symmetric rear face which includes an aperture which functions to conduct fluid to the needle, and a tubular section having a rear end which is sealably connected to the collar and a front end which is sealable connected to the neck; wherein inner walls of the tubular section and the rear face of the neck define one or more slots which extend from the rear end of the tubular section to the aperture. The space bounded by inner walls of the tubular section and the rear face of the neck, apart from the slots, is longer than the stopper and has the same rotational symmetry and approximately the same diameter as the outer diameter of the stopper, so that the stopper can substantially fill the space but does not cover the ends of the slots at the rear end of the tubular section.
318514
Duphar International Research B.v.
Fetherstonhaugh & Co.
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