Patent ID: 7618397

Claim:
A pump cassette for delivering fluid to patient, comprising: a pump housing comprising a first housing member and a second housing member cooperatively defining an enclosed pump chamber with an interior wall; at least a pair of meshed gears disposed in the pump chamber and separating the pump chamber into a fluid inlet area and a fluid outlet area accessible through respective inlet and outlet ports in the pump housing, and a gear core disposed on a center of each of the gears and formed symmetrically on a top and a bottom of each gear; a drive element interface formed on each of the gear cores; wherein the first and second housing members are formed substantially identically such that a top side and the bottom side of the pump housing are substantially identical, wherein the first housing member includes top oriented openings and the second housing member includes bottom oriented openings such that each drive element interface is disposed within a corresponding top or bottom oriented opening permitting the gears to be driven from either the top or bottom of the housing whereby fluid is pressurized for delivery to the patient.