Fluid storage unit, systems, and methods for catheter priming

A method of priming a catheter assembly, comprising:

• compressing a compressible reservoir of a fluid storage unit of a catheter assembly, wherein the catheter assembly comprises:
• a catheter hub having a distal end, a proximal end, a lumen extending between the distal end and the proximal end, and a side port;
• a catheter extending distally from the distal end of the catheter hub;
• an extension tube extending from the side port;
• and
• an adapter coupled to a proximal end of the extension tube,
• wherein the fluid storage unit includes the compressible reservoir, a barrier, and a hollow spike aligned with the barrier, wherein the compressible reservoir contains fluid and is entirely disposed on a first side of the barrier, wherein a longitudinal axis of the compressible reservoir is aligned with the hollow spike, wherein in response to compression of the compressible reservoir that is entirely disposed on the first side of the barrier, the fluid passes from the first side of the barrier to a second side of the barrier and the compressible reservoir is in fluid communication with the lumen of the catheter hub, wherein the fluid storage unit comprises a luer adapter aligned with the hollow spike and coupled to the adapter, wherein the hollow spike is fixed with respect to the luer adapter;
• breaching the barrier with the hollow spike in response to compressing the compressible reservoir;
• and
• after compressing the compressible reservoir of the fluid storage unit, inserting the catheter of the catheter assembly into vasculature.