Patent ID: 7591639

Claim:
A peristaltic pump comprising: a plurality of axially arranged occlusion surfaces including: a first occlusion surface; and a second occlusion surface; a plurality of rotors including: a first rotor configured to be rotated about an axis and carrying a first set of occluding surfaces; and a second rotor coupled to the first rotor and configured to be rotated about the axis and carrying a second set of occluding surfaces, wherein the first set of occluding surfaces and the second set of occluding surfaces have a staggered pitch, wherein, while the first rotor and the second rotor remain coupled to one another, at least one of the first set and the second set is movable between a first position in which the first set and the second set have the staggered pitch and a second position in which the first set and the second set have an off pitch.