Patent ID: 7094216

Claim:
An injection system for injecting an injection fluid into a patient, the system comprising: a pressurizing device for supplying injection fluid under pressure; a low pressure fluid delivery system; a pressure isolation mechanism having a first port adapted for connection to the pressurizing device, a second port adapted for connection to the patient, and a third port adapted for connection to the low pressure fluid delivery system, the pressure isolation mechanism comprising a valve having a first state and a mutually exclusive second state, the first state occurring when the second and third ports are connected and the first and third ports are connected, and the second state occurring when the first and second ports are connected and the first and third ports are disconnected, the valve being normally biased to the first state and being switchable to the second state when fluid pressure from the pressurizing device reaches a predetermined pressure level, the first and second ports being connected in both the first and second states of the valve; and an automated valve in line between the pressurizing device and the first port of the pressure isolation mechanism.