Method of making an elongate syringe barrel

A method of making an elongate syringe barrel for use with a needle assembly having a hub, said hub including a body portion having an outwardly projecting lug and a proximally facing annular surface, said barrel having a longitudinal axis, an outside surface and an inside surface defining a chamber for retaining fluid, an open proximal end, and open distal end including a collar and a distally facing annular surface projecting into said open proximal end, a portion of said collar including a cylindrically shaped sidewall having an inside surface and an outside surface, a ramp and a rest surface projecting inwardly from said inside surface, said ramp oriented at an acute angle with respect to said longitudinal axis for guiding said lug, during needle assembly attachment, to said rest surface forcing said annular surface on said hub to contact said annular surface in said open proximal end of said barrel, to form a seal between said hub and said barrel, said rotation of said hub with respect to said barrel being less than 180° while said lug travels along said ramp during installation of said needle assembly to said barrel, said method comprising the steps of:

• providing an injection mold having a cavity defining a syringe barrel, said mold including a fixed portion defining said outside surface of said barrel, a proximal core pin defining said chamber, a movable split cavity defining said outside surface of said collar and including a raised projection for forming an aperture in said collar and portions of said ramp and said rest surface, and a distal core pin which contacts said raised projection on said movable split cavity when said mold is closed to define remaining portions of said inside surface of said collar;
• injecting molten thermoplastic material into said cavity of said mold;
• allowing said thermoplastic material to solidify enough to allow movement of said barrel with respect to said mold cavity;
• opening said split cavity so that said raised projection is outside of said collar;
• removing said proximal core pin and said barrel axially from said fixed portion of said mold without rotation of said distal core pin.