Importance

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Abstract

A reusable syringe has a push rod with a threaded entrance hole in its tip end. The threaded hole leads into an inner capture area. A shot package includes a glass tube with a plunger having a stud with an interrupted thread for passing through the thread entrance hole and becoming captured in the inner capture area. When the rod is pushed, the stud transfers forces to the plunger without applying compression forces thereto. This way, the plunger does not expand and chatter against the glass tube wall, thereby risking breaking it. The inventive stud with interrupted thread is otherwise identical to prior art studs which are fully threaded. Thus, the syringe may receive and is fully compatible with both types of studs.

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First Claim