Sliding syringe cap for separate filling and delivery

A syringe for a fluid injector, the syringe comprising:

• a proximal end, a distal end, and a cylindrical sidewall between the proximal end and the distal end defining an interior volume for retaining a medical fluid therein;
• a fluid nozzle at the distal end;
• a piston engagement feature located on one of a plunger slidably associated with the syringe and a proximal end wall of the syringe, the piston engagement feature configured for releasably engaging a piston of the fluid injector;
• and
• a cap at least partially inserted into the fluid nozzle and configured to intake and deliver of the medical fluid from the syringe, the cap comprising:
• an outer cap assembly comprising a fluid inlet path and a fluid outlet path;
• and
• an inner cap assembly configured for insertion into the fluid nozzle of the syringe and to provide selective fluid communication between an interior of the syringe and the fluid inlet path or the fluid outlet path,
• wherein the outer cap assembly is slidable relative to the inner cap assembly and the fluid nozzle of the syringe between a first filling position, where the interior of the syringe is in fluid communication with the fluid inlet path, and a second delivery position, where the interior of the syringe is in fluid communication with the fluid outlet path,
• wherein the outer cap assembly has an engagement surface configured to engage a cap retention element of the fluid injector, wherein a cap engagement surface on the cap retention element prevents movement of the outer cap assembly in at least one of a proximal direction and a distal direction when the engagement surface on the outer cap assembly is engaged with the cap retention element, and
• wherein, when the engagement surface engages the cap retention element of the fluid injector, the outer cap assembly is slidable relative to the inner cap assembly upon distal and proximal movement of the syringe having the cap attached thereto.