Syringe plunger rod and method of manufacture

摘要: A plunger rod for a syringe in is of integrally injection molded plastic construction having an elongated body with coaxial end portion. An external thread extends around the portion threaded receipt into tip that slidably received barrel. flat chordally across interrupting thread. The plastic, which molded, gated mold at portion, leaving gate mark or vestige on flat. Gating material forms achieves improved flow and filling thread, while employing simple economical construction. does not interfere threading tip. cored during molding to provide C-shaped cross section improves dimensional stability shrinkage after molding.