Patent ID: 8377003

Claim:
A power injector, comprising: a powerhead; first and second syringes interconnected with said powerhead; first and second syringe plunger drivers that are at least interconnectable with said first and second syringes, respectively; and control logic that comprises a syringe plunger driver retraction protocol, wherein said syringe plunger driver retraction protocol is executable in preparation for removal of said first and second syringes from said powerhead, wherein said syringe plunger driver retraction protocol is in the form of a programmed sequence within said control logic, and wherein said syringe plunger driver retraction protocol is configured to: a) retract said first syringe plunger driver from a first stopped position toward a first fully retracted position, but stops said first syringe plunger driver at a first intermediate position that is between said first stopped position and said first fully retracted position; b) retract said second syringe plunger driver from a second stopped position back to a second fully retracted position; and c) retract said first syringe plunger driver from said first intermediate position back to said first fully retracted position.