A catheter introducer system for accessing a blood vessel comprising: a dilator , the dilator being an elongated tubular member having a dilator proximal end and a dilator distal end opposite from the dilator proximal end, the dilator further including a dilator lumen extending from the dilator proximal end to the dilator distal end therethrough; a core , the core being an elongated member having a core proximal end and a core distal end opposite from the core proximal end, the core including a core lumen , the core lumen operable to receive a guidewire and the core operable to be advanced over the guidewire , the core distal end including a core curve that defines a predetermined curve, the core being operable for positioning in the dilator lumen to impart a curvature to the dilator , modify a bending resistance of the dilator, or a combination thereof, the dilator lumen defines a diameter that is operable to slidingly receive the core therein and allow the core to be advanced at least partially within the dilator lumen; and a sheath , the sheath being an elongated tubular member including a sheath proximal end and a sheath distal end opposite from the sheath proximal end, the sheath defining a sheath lumen extending from the sheath proximal end to the sheath distal end therethrough, the sheath lumen that is operable to slidingly receive the dilator therein and to allow the sheath to advance over the dilator, wherein the combination of the dilator supported by the core provides sufficient stiffness at the core curve such that the sheath is operable to track over the curvature of the dilator as imparted by the core. a dilator , the dilator being an elongated tubular member having a dilator proximal end and a dilator distal end opposite from the dilator proximal end, the dilator further including a dilator lumen extending from the dilator proximal end to the dilator distal end therethrough; a core , the core being an elongated member having a core proximal end and a core distal end opposite from the core proximal end, the core including a core lumen , the core lumen operable to receive a guidewire and the core operable to be advanced over the guidewire , the core distal end including a core curve that defines a predetermined curve, the core being operable for positioning in the dilator lumen to impart a curvature to the dilator , modify a bending resistance of the dilator, or a combination thereof, the dilator lumen defines a diameter that is operable to slidingly receive the core therein and allow the core to be advanced at least partially within the dilator lumen; and a sheath , the sheath being an elongated tubular member including a sheath proximal end and a sheath distal end opposite from the sheath proximal end, the sheath defining a sheath lumen extending from the sheath proximal end to the sheath distal end therethrough, the sheath lumen that is operable to slidingly receive the dilator therein and to allow the sheath to advance over the dilator, wherein the combination of the dilator supported by the core provides sufficient stiffness at the core curve such that the sheath is operable to track over the curvature of the dilator as imparted by the core. <EOS>