Patent ID: 6171285
Filing Date: 2001-01-09
Classification: A61M

Abstract:
A retractable syringe comprising a needle hub having interior hub threads and exterior hub threads; a syringe barrel for receiving said needle hub and barrel threads provided in said syringe barrel for engaging said exterior hub threads of said needle hub; a syringe plunger slidably disposed in said syringe barrel and plunger threads provided on said syringe plunger for engaging said interior hub threads of said needle hub, wherein said barrel threads and said exterior hub threads are oppositely-threaded with respect to said plunger threads and said interior hub threads, whereby said syringe plunger is rotated inside said syringe barrel for engaging said plunger threads with said interior hub threads, and continued rotation of said syringe plunger and said needle hub draws said needle hub inside said syringe barrel.