Patent ID: 6030367
Filing Date: 2000-02-29
Classification: A61M

Abstract:
A dimensionally stable plunger rod for use with a plunger in a cartridge or syringe barrel for manual or power-assisted withdrawing of fluid from a site or expelling fluid from the cartridge or syringe barrel comprising:a plunger rod body having a distal end and a proximal end;an end disc at said distal end;a threaded member integral with said end disc adapted to engage said plunger;a thumb rest at said proximal end for facilitating exertion of an external pressure on said plunger rod body;a reinforcing disc at about the longitudinal mid point of said plunger rod body;a first pair of rectangular radially extending vanes connecting said end disc and said reinforcing disc;a second pair of rectangular radially extending vanes connecting said reinforcing disc and said thumb rest;a first pair of isosceles triangular radially extending vanes connecting said end disc and said reinforcing disc, wherein the smallest angle of said isosceles triangular vanes point toward said reinforcing disc; anda second pair of isosceles triangular radially extending vanes connecting said reinforcing disc and said thumb rest, wherein the smallest angle of said isosceles triangular vanes point toward said reinforcing disc;wherein:said first pair of rectangular radially extending vanes and said first pair of isosceles triangular radially extending vanes are integral with each other and with said end disc and said reinforcing disc; andsaid second pair of rectangular radially extending vanes and said second pair of isosceles triangular radially extending vanes are integral with each other and with said reinforcing disc and said thumb rest.