Patent ID: 8419676

Claim:
A powered medical fluid injection device, comprising: an injector head; a sleeve coupled to the injector head and configured to include a pressurizing unit; a first pinch valve mechanism coupled to the injector head and configured to control fluid flow into or out of the pressurizing unit, wherein the first pinch valve mechanism comprises a first plunger, a first reciprocating arm driven by the first plunger, and a first tube pinching area, and wherein the first pinch valve mechanism is configured to cause the first reciprocating arm to pinch first fluid tubing that runs through the first tube pinching area; and a second pinch valve mechanism coupled to the injector head and configured to control fluid flow into or out of the pressurizing unit, wherein the second pinch valve mechanism comprises a second plunger, a second reciprocating arm driven by the second plunger, and a second tube pinching area, and wherein the second pinch valve mechanism is configured to cause the second reciprocating arm to pinch second fluid tubing that runs through the second tube pinching area, wherein when the injector head is configured to determine whether to perform a fill operation to draw fluid through the first fluid tubing and into the pressurizing unit, the injector head is configured to deactivate the second pinch valve mechanism, such that the second reciprocating arm of the second pinch valve mechanism pinches closed the second fluid tubing that runs through the second tube pinching area, responsive to the injector head determining that a status of the second tube pinching area is unexpected when a status of the first tube pinching area indicates that the first tube pinching area is open for the fill operation to draw fluid through the first fluid tubing.