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Backstop device for a flangeless syringe

  • US 5,607,399 A
  • Filed: 09/22/1995
  • Issued: 03/04/1997
  • Est. Priority Date: 09/22/1995
  • Status: Expired due to Term
First Claim
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1. A device for preventing inadvertent removal of a stopper from a flangeless syringe, said flangeless syringe having a barrel adapted to retain a plunger rod having a minimum width, said barrel having an outside circumference, and outside diameter, an inside diameter, and an open proximal end, comprising;

  • a backstop attachable adjacent the open proximal end of said flangeless syringe, said backstop including a retaining wall having proximal and distal ends and defining an opening having a width not greater than the outside diameter of said syringe barrel; and

    a finger plate affixed to the proximal end of the retaining wall, said finger plate defining an aperture therethrough in communication with the open proximal end of the flangeless syringe, said aperture having a width not greater than the inside diameter of the syringe barrel, and a lead opening communicating with said aperture, said lead opening having a width at least equal to the minimum diameter of the plunger; and

    a ridge defined about a portion of said aperture, said ridge adapted to engage a portion of said flangeless syringe adjacent the syringe barrel to prevent withdrawal of the stopper from the flangeless syringe.

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