Patent ID: 8591453

Claim:
A method for controlling a dual lumen outflow tubing set used on a pump housing having a peristaltic pump with a rotor assembly, said method comprising providing said tubing set comprising a first fluid input tube and a second fluid input tube separated from one another by a backing plate, a fluid path of said first fluid input tube being joined together with a fluid path of said second fluid input tube at a location between said backing plate and a common output peristaltic roller tube; providing a reciprocating pinching valve member having opposed pinching surfaces for selectively pinching closed said first fluid input tube or said second fluid input tube against said backing plate, said pinching valve member movable between a second position and an opposed third position, and having a loading opening between said pinching surfaces for receiving said first fluid input tube and said second fluid input tube simultaneously with said backing plate; situating said fluid input tubes and said backing plate in said opening of said pinching valve member, said backing plate adapted to be held stationary in relation to said reciprocating pinching valve member to provide a surface against which said first fluid input tube may be pinched closed by said pinching valve member in said second position and against which said second fluid input tube may be pinched closed by said pinching valve member in said third position; moving said pinching valve member to said second position to pinch close said first input tube; and moving said pinching valve member to said third position to open said first input tube and to pinch close said second input tube.