Patent ID: 7331941
Filing Date: 2008-02-19
Classification: A61M

Abstract:
1. A hypodermic syringe comprising: a hollow body adapted to hold a liquid and having an axially outwardly open end; an inner cap fitted over the body end; an axially extending needle seated in the inner cap and having an outer point projecting axially outward from the inner cap and an inner point projecting axially inward from the inner cap toward the body; a washer between the inner cap and the body end, having a central hole into which the inner point of the needle engages, and provided with a membrane closing the hole and spaced axially inward from the inner point and out of engagement with the needle; an outer cap fittable over the inner cap and needle; a clamp ring engageable around the inner cap; a frangible web connecting the ring to the outer cap; and interengaging formations on the ring and on the inner cap for releasably retaining the outer cap in an outer position spaced axially outward of the body and in which an interior of the outer cap is open to the exterior and an inner position spaced axially closely to the body and in which the interior of the outer cap is not open to the exterior.