Pediatric catheter system and related devices and methods

A method, comprising:

• inserting a catheter system into vasculature of a patient, wherein the catheter system comprises:
• a catheter adapter, comprising a distal end, a proximal end, and a lumen extending through the distal end and the proximal end;
• a concertinaed tube, comprising a distal end coupled to the proximal end of the catheter adapter and disposed in a collapsed position, wherein the concertinaed tube is movable between the collapsed position and an expanded position;
• a luer connector coupled to a proximal end of the concertinaed tube, wherein the luer to movement A connector is configured to extend through the concertinaed tube in response to movement of the concertinaed tube from the expanded position to the collapsed position such that the luer connector extends distal to the distal end of the concertinaed tube;
• and
• a needle assembly, comprising a needle hub and an introducer needle extending distally from the needle hub, wherein the concertinaed tube and the luer connector are disposed within the needle hub;
• removing the needle assembly from the catheter adapter inserted within the vasculature of the patient;
• after removing the needle assembly from the catheter adapter system, moving the concertinaed tube from the collapsed position to the expanded position.