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Injection syringe

  • US 4,276,878 A
  • Filed: 08/20/1979
  • Issued: 07/07/1981
  • Est. Priority Date: 08/20/1979
  • Status: Expired due to Term
First Claim
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1. An injection syringe for injection of high viscosity pastes comprising:

  • a frame;

    a pair of handles mounted to said frame, at least one of which is pivotally mounted to said frame, said handles comprising grip means which can be squeezed to move the handles toward one another;

    an elongated cylinder mounted to and projecting beyond said frame having a first end spaced from said frame to which an injection cannula can be mounted;

    a piston slidably fitted in said cylinder;

    a piston rod connected to said piston and extending from the other end of said cylinder, said piston having discontinuities along its length;

    piston advancing means connected to said grip means and adapted to engage said discontinuities to move said piston rod and piston toward said end when said grip means is squeezed, at least that portion of said cylinder which is adjacent to its first end being flexible, and at least that portion of said piston rod which occupies said portion of said cylinder when said piston is adjacent to said first end being flexible, the ratio of the length diameter and wall thickness of said portion of said cylinder being such that said cylinder with the rod inside it can be bent and still allow the advance of the piston rod and piston to eject paste from said cylinder through said cannula.

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