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AUTO RETRACTABLE SYRINGE

  • US 20090240210A1
  • Filed: 01/06/2006
  • Published: 09/24/2009
  • Est. Priority Date: 03/14/2005
  • Status: Abandoned Application
First Claim
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1. An auto-retractable safety syringe incorporating an auto retractable needle assembly therein, the safety syringe having a syringe barrel which has a hollow plunger slideably located therein, the hollow plunger having a proximal and distal end with piston means associated therewith at its distal end so as to be sealingly slideable within the barrel, the needle assembly comprising a needle and a needle hub, with a recess in the end of the barrel to hold the needle hub of the needle and a spring disposed over said needle hub and acting between the needle hub and the end of the barrel, the spring remaining under compression during use, the needle hub having sealing means associated therewith to prevent leakage between the needle hub and the end of the barrel, said needle hub having a groove or recess around its circumference in which a locking means mates so as to retain the needle hub in the end of the syringe barrel during use against the compressive action of the spring, and wherein said distal end of the hollow plunger has a sealing stopper, the plunger contacting in a first stage said needle assembly upon completion of an injection and when further depressed activating auto retraction of the needle hub by acting upon the locking means so as to cause said locking means to be dislodged from said groove or recess to release the needle hub by reaching a second stage, said sealing stopper being dislodged from said distal end of the plunger when it reaches the second stage by the action of the needle as it retract, thereby releasing said needle hub and hence allowing the needle and spring to retract inside said hollow plunger under the influence of the spring.

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