Patent ID: 6800066
Filing Date: 2004-10-05
Classification: A61M

Abstract:
A syringe device comprising:a barrel for containing fluid to be delivered through a needle; a needle mounting hub at one end of said barrel and a needle mounted in said hub; a biasing element operatively arranged to urge said hub inwardly into said barrel; a stop element adapted to block inward movement of said hub into said barrel; a hollow plunger which is movable within said barrel with a delivery stroke to deliver fluid from said barrel to said needle, said plunger adapted to allow retraction of said hub and needle into said plunger at the conclusion of the delivery stroke of the plunger, the forward end of the plunger comprising a rim portion and a central blocking portion, said central blocking portion separable from said rim portion; said hub and stop element comprising molded plastic components, said hub and stop element separably, sealingly, intimately, and form fittingly engaging one another along a substantially axial interface; and said hub and stop element adapted to disengage from one another along said interface at the conclusion of said plunger delivery stroke to allow said biasing element to drive said needle into said hollow plunger.