Fluid injection apparatus with improved contrast visualization

A method of manually injecting fluid, comprising the steps of:

• retracting a plunger from a syringe cylinder and drawing fluid into the cylinder;
• depressing the plunger into the cylinder forcing the fluid out of an outlet of the cylinder;
• increasing the speed with which the fluid may be injected;
• and
• injecting the fluid into a patient.

A manually operated fluid injection system, comprising:

• a syringe having a movable plunger;
• a manifold having a plurality of input ports and first and second ends, the syringe being connected to the first end of the manifold;
• a fluid line having first and second ends, the first end of the fluid line being connected to one of the plurality of input ports;
• a catheter connected to the second end of the, catheter
• a source of fluid in communication with the fluid line;
• and
• a heater operatively associated with one of the syringe, manifold, fluid line, catheter and source of fluid.

A manually operated fluid injection system, comprising:

• a syringe having a movable plunger;
• a manifold having a plurality of input ports and first and second ends, the syringe being connected to the first end of the manifold;
• a fluid line having first and second ends, the first end of the fluid line being connected to one of the plurality of input ports;
• a catheter connected to the second end of the catheter;
• a source of fluid in communication with the fluid line;
• and
• an expandable ring associated with the catheter, the ring being expandable after catheter insertion and prior to injection to constrict blood flow.