Guide element for intravascular access device

An intravascular access device, comprising:

• a handle having a proximal end and a distal end, a slot extending from the proximal end to the distal end;
• a catheter having a proximal catheter hub and a distal catheter lumen, the proximal catheter hub releasably engaged to the distal end of the handle;
• an access needle extending proximally from within a needle carrier through the catheter lumen, the access needle having at least one flat surface extending longitudinally along a perimeter of the access needle, and a tissue-penetrating tip extending distally beyond the catheter lumen;
• a working space within the catheter along a length of the access needle having a nonuniform circumferential cross-sectional geometry, wherein the working space is configured to facilitate passage of one or more tool therethrough from a proximal end of the intravascular access device distally into a vessel;
• and
• a slide extending through the slot, the slide in communication with a proximal end of the guide element so that distal advancement of the slide advances a distal tip portion of the guide element from a position within a guide element cutout distally along the surface of the access needle.