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Pre-filled syringe

  • US 4,747,829 A
  • Filed: 01/21/1987
  • Issued: 05/31/1988
  • Est. Priority Date: 01/21/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for a one time injection of a liquid injectant comprising:

  • a hollow cylindrical casing having a first open end and a second opposite end;

    a barrel for holding said injectant, said barrel disposed at a first end to slide through said first open end of said casing from a remote pre-injection position to a forward injection position and back again;

    means coupled to said barrel for ejecting said injectant;

    a hollow needle disposed within said casing and having an opening at each end thereof;

    means for extending said needle through said casing second end and placing said needle in fluid communication with said injectant when said barrel moves from said remote pre-injection position to said forward injection position and for retracting said needle through said casing second end into said casing when said barrel moves back again to said pre-injection position; and

    means for blocking automatically said needle from extending through said casing second end after said needle has been retracted.

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