Patent ID: 7556481

Claim:
A peristaltic pump device comprising: a platen having a platen surface; a tube positioned adjacent to the platen surface; a cam that rotates about a rotational axis, said cam having a cam surface that is spaced apart from the platen surface; a plurality of fingers, each finger having a first part nearer the cam and a second part nearer the tube and also having a torsion spring for urging the finger away from the tube and a longitudinal axis that is substantially parallel to the rotational axis of the cam, said fingers being in engagement with the cam surface such that, as the cam rotates about the rotational axis, the fingers will move axially back and forth, sequentially compressing the tube against the platen surface and thereby causing peristaltic movement of fluid through the tube; and a door that may be opened and closed to allow access to the tube, wherein the tube is mounted on or in a cassette and the door may be opened to gain access to allow removal of the cassette having the tube thereon or therein and replacement thereof with another cassette having another tube thereon or therein, and wherein at least one alignment surface is formed in the door, said alignment surface being configured to register with the cassette when the door is closed, thereby holding the cassette in a desired alignment, and wherein the platen surface is on an inner surface of the door and at least one indentation is formed in said platen surface such that the tube will be substantially juxtaposed to the platen surface when the door is closed.