Syringe having needle isolation features

摘要

A syringe (10) having structure to isolate fluid (30) from the distal end (18) of the syringe includes a barrel (12) with a chamber (16) therein. A stopper (32) is slidingly disposed in the chamber (16) and is provided with an aperture (40) extending axially therethrough. A plug (34) includes a head (52) releasably engaged in a sealing portion of the aperture (40) of the stopper (32). A rigid tail (54) extends distally from the head (52) and through the aperture (40) in the stopper (32) and projects outwardly from the distal end of the stopper. The tail (54) is long enough so that it can be used to move the head (52) out of the sealing portion of the aperture (40) by applying force to the distal end of the tail (54). The tail (54) has a cross-sectional shape which defines at least one fluid channel (56) between the tail (54) and the sealing portion of the stopper to allow fluid (30) to flow from the chamber (16) through the aperture (40) in the stopper (32) and out of the distal end (18) of the barrel (12).