Importance

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Abstract

A safety syringe having a cylindrical hollow barrel member of semi-elastic material has a seal and stop device at the distal open end and a first restraining stop device axially spaced a preselected distance from the distal open end. A cylindrically shaped needle carrier is initially positioned within the barrel member between the stop device, the needle carrier having a centrally located recess device at the proximal end thereof for receiving and holding a male piston extension device. A piston rod having a piston is provided for drawing fluid into the barrel and forcing fluid out of the barrel through a longitudinal bore in the needle carrier and through an elongated hollow needle attached to the needle carrier. The piston has a male extension at the distal end for engagement with the female recess of the needle carrier. The piston coacts with the first restraining stop device so as to stretch the barrel to disengage the stop means from the needle carrier and to permit subsequent longitudinal movement of the assembled and locked piston and needle carrier in the proximal direction relative to the barrel so as to withdraw the hollow needle means totally within the barrel to prevent accidental contact of the needle with an errant body part.

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First Claim