Abstract: 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 having:a plunger rod body with distal end proximal ends;an end disc at the distal end;a threaded member integral with the end disc designed to engage a plunger;a thumb rest at the proximal end;a reinforcing disc at about the longitudinal mid point of the plunger body;a first pair or rectangular radially extending vanes connecting the end and reinforcing discs;a second pair or rectangular radially extending vanes connecting the reinforcing disc and the thumb rest;a first pair of triangular radially extending vanes connecting the end disc and the reinforcing disc; anda second pair of triangular radially extending vanes connecting the reinforcing disc and the thumb rest.

Abstract: Finger grip collar positioned on the proximal end of a syringe or cartridge barrel by a snap-on motion to facilitate manipulation of the syringe or cartridge during the injection or withdrawal of a medical fluid into or from a site. The finger grip collar requires no special orientation or positioning on the barrel of the syringe or cartridge for the practitioner to manipulate the assemblage.