Patent ID: 7614857

Claim:
A medical pump device, comprising: an inlet connector arranged for connecting a first fluid conduit to the medical pump device; an outlet connector arranged for connecting a second fluid conduit to the medical pump device; a pump part comprising at least one chamber wall moveable between forward and retracted positions within a pump chamber, such that when the at least one chamber wall moves from the forward position to the retracted position the pump chamber is filled with fluid from the inlet connector and when the at least one chamber wall moves from the retracted position to the forward position the pump chamber is emptied through the outlet connector; and a rotary valve assembly comprising a rotary valve housing with three openings each corresponding with one of the inlet connector, the outlet connector, and the pump chamber, the rotary valve including a rotary valve element provided with only a straight channel having a substantially constant thickness for limiting adherence of air bubbles within the housing during a rinsing operation, the straight channel being arranged to correspond with two of the openings at a time depending on the position of the rotary valve element for a selectable fluid communication between the inlet connector, the outlet connector, and the pump chamber, wherein the openings are arranged uniformly in the rotary valve housing and staggered by 120°, wherein an opening of the pump chamber is directly connected to one of the three openings of the rotary valve housing, wherein a front end of the at least one chamber wall of the pump part is shaped to conform with an outer contour of the rotary valve element, and wherein only the straight channel of the rotary valve element is utilized for the filling of the pump chamber, the emptying of the pump chamber, and the rinsing operation of the medical pump device.