A system for controlled delivery of a medical fluid from a source of such fluid to a patient, said system comprising: an inlet conduit for being communicably joined to a source of the medical fluid; an outlet conduit for being communicably joined to the patient; first and second syringes (80, 84) intermediate said inlet and outlet conduits; and a control valve assembly interconnecting said inlet conduit, said outlet conduit, said first syringe and said second syringe, said control valve assembly being alternatable between a first state wherein said inlet conduit communicates with said first syringe for transmitting fluid from the source to said first syringe, a second state wherein said first syringe communicates with said second syringe and is isolated from said inlet and outlet conduits for transmitting fluid from said first syringe to said second syringe, and a third state wherein said second syringe communicates with said outlet conduit and is isolated from said inlet conduit and said first syringe for transmitting fluid from said second syringe to said outlet conduit; said control valve assembly includes a valve body having aligned inlet and outlet ports (38, 40), said inlet port being communicably connectable to said inlet conduit and said outlet port being communicably connectable to said outlet conduit, said valve body further including a first intermediate port to which said first syringe is selectively connected and a second intermediate port to which said second syringe is selectively connected, said control valve assembly further including a stopcock element mounted rotatably within said body and including an angled channel that is selectively alignable with said inlet port and said first intermediate port to allow for communication between said inlet conduit and said first syringe, said first intermediate port and said second intermediate port to allow for communication between said first syringe and said second syringe, and said second intermediate port and said outlet port to allow for communication between said second syringe and said outlet conduit characterized in that said control valve prevents direct fluid flow from the inlet port to the outlet port. an inlet conduit for being communicably joined to a source of the medical fluid; an outlet conduit for being communicably joined to the patient; first and second syringes (80, 84) intermediate said inlet and outlet conduits; and a control valve assembly interconnecting said inlet conduit, said outlet conduit, said first syringe and said second syringe, said control valve assembly being alternatable between a first state wherein said inlet conduit communicates with said first syringe for transmitting fluid from the source to said first syringe, a second state wherein said first syringe communicates with said second syringe and is isolated from said inlet and outlet conduits for transmitting fluid from said first syringe to said second syringe, and a third state wherein said second syringe communicates with said outlet conduit and is isolated from said inlet conduit and said first syringe for transmitting fluid from said second syringe to said outlet conduit; said control valve assembly includes a valve body having aligned inlet and outlet ports (38, 40), said inlet port being communicably connectable to said inlet conduit and said outlet port being communicably connectable to said outlet conduit, said valve body further including a first intermediate port to which said first syringe is selectively connected and a second intermediate port to which said second syringe is selectively connected, said control valve assembly further including a stopcock element mounted rotatably within said body and including an angled channel that is selectively alignable with said inlet port and said first intermediate port to allow for communication between said inlet conduit and said first syringe, said first intermediate port and said second intermediate port to allow for communication between said first syringe and said second syringe, and said second intermediate port and said outlet port to allow for communication between said second syringe and said outlet conduit characterized in that said control valve prevents direct fluid flow from the inlet port to the outlet port.