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Syringe for extrusion of wetted, particulate material

  • US 4,645,488 A
  • Filed: 11/30/1983
  • Issued: 02/24/1987
  • Est. Priority Date: 08/12/1982
  • Status: Expired due to Fees
First Claim
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1. A dental restorative dispensing syringe for extruding a wetted particulate mass therefrom which comprises:

  • (A) a barrel of flexible plastic material having at least one longitudinal slit therein at its open end in combination with (B) a piston slidable within the bore of said barrel providing a seal between said piston and the inside wall of the barrel along its entire length and having means for making positive engagement with (C) a plunger rod, the length of said slit being approximately equal to the length of the wetted particulate mass to be extruded therefrom and being operative to allow said barrel to expand under the influence of said wetted particulate mass when said piston is extruding said mass, thereby reducing barrel resistance.

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