#$%^&*AU2019253792A120191114.pdf#####ABSTRACT One embodiment is directed to a system for creating translumenal vascular access, wherein a guidewire may be advanced at least in part through a dilator adaptor lumen, a dilator adaptor may be advanced at least in part through a dilator member lumen, and a dilator member may be advanced at least in part through an introducer lumen to form an instrument assembly capable of forming substantially atraumatic outer shape profile configuration defined by longitudinally sequential increases in overall outer diameter from exposed distal ends of the guidewire, dilator adaptor, dilator member, and introducer.