Feeding set with cassette and related methods therefor

1. A pump set for use with a pumping apparatus having a pumping system including a rotor for rotation about a pump axis and at least one roller mounted on the rotor for engaging a pump set, the pump set comprising:

a resiliently deformable tube for carrying a liquid; and

a cassette receiving the resiliently deformable tube and adapted for releasable attachment to the pumping apparatus to mount the pump set on the pumping apparatus for engagement by the at least one roller to deliver fluid through the pump set, the cassette comprising a flexible stator having a stator surface arranged to be in generally opposed relation to said at least one roller to act as a reaction surface against which the resiliently deformable tube is squeezed by the rotor, the flexible stator member being at least partially free to float in a stator opening when the resiliently deformable tube is engaged by the at least one roller, the flexible stator member having a transverse rib extending transverse to a length of the flexible stator member, the transverse rib being disposed on a bottom surface of the flexible stator member opposite the stator surface, wherein the transverse rib comprises a first transverse rib, the flexible stator member further comprising a second transverse rib extending transverse to the length of the flexible stator member, the second transverse rib being disposed on the bottom surface of the flexible stator member.

2. The pump set as set forth in claim 1 , wherein the resiliently deformable tube has a central flow passage that lies generally in a plane within the cassette, and the stator surface of the cassette is arranged parallel to the plane of the central flow passage within the cassette.

3. The pumping apparatus as set forth in claim 1 , wherein the resiliently deformable tube is contained entirely within the cassette.

4. The pumping apparatus as set forth in claim 1 , further comprising lips constructed and arranged to constrain the resiliently deformable tube along an axis.

5. The pumping apparatus as set forth in claim 1 , wherein the resiliently deformable tube is connected to a tube holder secured to the cassette.

6. The pump set as set forth in claim 1 , wherein the flexible stator member includes a first section extending along the length of the flexible stator member having a first thickness and a second section extending along the length of the flexible stator member having a second thickness that is greater than the first thickness of the first section, the transverse ribs being disposed only on the first section of the flexible stator member.

7. A method of facilitating use of a pumping apparatus having a rotor with a plurality of rollers, the method comprising:

providing a cassette body comprising a flexible stator member with a fixed portion secured to the cassette body, a second portion opposite the fixed portion, a reaction surface and a second surface opposite the reaction surface, the reaction surface defined between the fixed portion and the second portion; and

securing a tube to the cassette body with at least a portion of the tube disposed against the reaction surface, the flexible stator member being at least partially free to float in a stator opening when the tube is engaged by at least one of the plurality of rollers, the flexible stator member having a transverse rib extending transverse to a length of the flexible stator member, the transverse rib being disposed on the second surface of the flexible stator member opposite the reaction surface, wherein the transverse rib comprises a first transverse rib, the flexible stator member further comprising a second transverse rib extending transverse to the length of the flexible stator member, the second transverse rib being disposed on the second surface of the flexible stator member.