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Trap in barrel one handed retractable safety syringe

  • US 4,978,343 A
  • Filed: 03/06/1990
  • Issued: 12/18/1990
  • Est. Priority Date: 01/16/1990
  • Status: Expired due to Term
First Claim
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1. A syringe held by fingers and thumb for injecting medicament or fluid into a body or part of a body comprising:

  • an elongated hollow barrel having a first end and a second end, and having an inner surface and an outer surface and further having a longitudinal axis in the center of the said elongated hollow barrel, parallel in most part of the said inner surface and said outer surface of the said elongated hollow barrel further extending from said first end to said second end of said elongated hollow barrel;

    a slidable plunger assembly inside of said elongated hollow barrel, said slidable plunger assembly having a first end and a second end and further having a plunger piston at said first end and a thumb flat at said second end wherein a thumb or finger pushes on said thumb flat in a direction toward said first end;

    a slidable piston inside of said elongated hollow barrel, said slidable piston having a first end and a second end and said first end of said slidable piston is nearer said first end of said elongated hollow barrel;

    a pimple fixed to said second end of said slidable piston;

    a needle cannula having a first end and a second end, said first end of said needle cannula extends past said first end of said elongated hollow barrel and said second end of said needle cannula is fixed to said first end of said slidable piston;

    a spring means having a first end and a second end, said first end of said spring means is integral with said first end of said elongated hollow barrel and said second end of said spring means is integral with said slidable piston, said spring means is further compressed between said first end of said elongated hollow barrel and said slidable piston;

    at least one trigger notch formed into said slidable piston assembly, said trigger notch further having at least, a first side and a second side, said first side is near perpendicular to said longitudinal axis of said elongated hollow barrel and said first side is nearer to said first end of said slidable piston and said second side of said trigger notch is a trigger notch slope wherein said trigger notch slope is near to said first side of said trigger notch and slopes away from said first side in the direction of said second end of said slidable piston;

    a barrel flange fixed to said first end of said elongated hollow barrel;

    an inner rim fixed to said barrel flange;

    a needle cannula tunnel in said barrel flange and said inter rim;

    at least one slidable trigger, having a first end and a second end, said slidable trigger is held in place within said trigger guide wherein said first end of said slidable trigger is located near the outer surface of said elongated hollow barrel and said slidable trigger further extends past said trigger guide and engages said trigger notch formed into said slidable piston, said second end of said slidable trigger having a slope similar to said trigger notch slope and wherein the said thumb flat of the said slidable plunger assembly is pushed by said finger or thumb and further pushes said plunger into the second end of the said slidable piston further pushing said slidable piston, thereby further compressing the said spring means and further causing the said trigger notch slope to further push on the slope of the said slidable trigger, further causing the said slidable trigger to slide in a direction away from the said longitudinal axis of the said elongated hollow barrel and wherein said sliding trigger no longer engages the said trigger notch and wherein said finger or thumb is further removed from the said thumb flat thus allowing the said spring means to push on the slidable piston which will further push on the slidable plunger assembly thus forcing the needle cannula to move into the first end of the said elongated hollow barrel wherein said pimple on said slidable piston will further thrust into said slidable plunger assembly causing said slidable piston and said needle cannula to slope relative to said longitudinal axis further pointing the tip of said needle cannula away from said needle cannula tunnel completely enclosing said needle cannula within said elongated hollow barrel, said barrel flange and said inner rim wherein said needle cannula cannot be accidentally pushed out of said elongated hollow barrel thus preventing the said needle cannula from accidentally pricking or injuring others.

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