Patent ID: 7762795

Claim:
A method for pumping fluid-comprising: A) providing a peristaltic pump device that includes: i) a platen having a platen surface, ii) a tube positioned adjacent to the platen surface, iii) a cam that rotates about a rotational axis, said cam having a cam surface that is spaced apart from the platen surface, iv) a plurality of fingers that move back and forth on longitudinal axes that are substantially parallel to the rotational axis of the cam, said fingers being in cooperative engagement with the cam surface such that rotation of the cam about the rotational axis will cause the fingers to move back and forth on said longitudinal axes, thereby sequentially compressing the tube against the platen and resulting in peristaltic movement of fluid through the tube, v) a door configured to open and close to allow access to the tube, vi) a cassette, wherein the tube is mounted on or in the cassette, and vii) the door including at least one alignment surface, wherein the platen surface is located on an inner surface of the door, at least one indentation formed in the platen surface; B) attaching one end of the tube to a source of fluid; C) enabling the door to be closed such that (a) the at least one alignment surface registers with the cassette to hold the cassette in a desired alignment and (b) the at least one indentation formed in the platen surface causes the tube to be at least substantially juxtaposed to the platen surface; and D) enabling the cam to be rotated such that the fingers sequentially compress the tube against the platen surface, thereby causing peristaltic movement of the fluid through the tube.