Abstract: A system for introducing a fine bore catheter into a vein includes a cannula unit comprising an elongate tubular sheath, defining a distal end and a proximal end, and a hub enclosing the proximal end of the sheath. The cannula unit is adapted to receive an introducing needle for introducing the distal end of the sheath of the cannula into a vein. The system also includes a catheter unit, having a distal end and a proximal end, a body portion located at the proximal end of the catheter unit, and a catheter tube extending from the body portion to the distal end of the catheter unit.