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Automatically locking hypodermic needle hiding shield for a dose metering syringe

  • US 5,609,577 A
  • Filed: 01/29/1996
  • Issued: 03/11/1997
  • Est. Priority Date: 01/29/1996
  • Status: Expired due to Fees
First Claim
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1. In combination:

  • a syringe to administer an injection, said syringe comprising a medication cartridge housing in which a fluid medication is stored and a hypodermic needle coupled to and projecting outwardly from said medication cartridge housing in fluid communication therewith; and

    a needle shield to shield said hypodermic needle prior to and after the administration of the injection, said needle hiding shield comprising;

    an inner sleeve surrounding said medication cartridge housing and being coupled thereto,an outer sleeve surrounding said inner sleeve,a needle guard having proximal and distal ends, the proximal end of said needle guard connected to said outer sleeve, said needle guard surrounding and shielding said hypodermic needle coupled to said medication cartridge housing,spring means extending between said inner sleeve and said outer sleeve for locating said inner sleeve at the proximal end of said needle guard, said inner sleeve and said medication cartridge housing coupled thereto adapted to be advanced distally through said needle guard, andlocking means releasably engaging said inner sleeve to block the distal advancement of said inner sleeve through said needle guard,said locking means releasing said inner sleeve to permit said inner sleeve and said medication cartridge housing coupled thereto to be advanced distally through said needle guard when the injection is to be administered to cause said spring means to be stretched and said hypodermic needle to be moved outwardly from the distal end of said needle guard to be unshielded and penetrate an injection site at which to deliver the fluid medication from said medication cartridge housing, said spring means relaxing at the conclusion of the injection to drive said inner sleeve and said medication cartridge housing proximally through said needle guard to retract said hypodermic needle inwardly of the distal end of said needle guard to be reshielded thereby.

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