CENTRIFUGAL BLOOD PUMP APPARATUS

摘要

The invention relates to a centrifugal blood pump apparatus comprising a housing having an inlet port, an outlet port and a pump chamber connecting these ports and an impeller located in the pump chamber and rotatable around an axis of rotation being coaxial with the inlet port, the impeller having a central axial opening, communicating with the inlet port, several blades and free spaces between the blades, the free spaces being radially open and communicating with the central axial opening and with the outlet port via a volute surrounding the impeller and a magnetic drive, driving the impeller by means of a magnetic field interacting with permanent magnets integrated in the impeller and a bearing for the impeller, in particular a hydrodynamic bearing, preferably by means of several spiral grooves or tilted pads in a lower end face of the impeller opposite to a mating inner surface of a lower wall of the pump chamber or in a mating inner surface of the lower wall of the pump chamber opposite to a lower end face of the impeller wherein each of the blades of the impeller has an axial abutting face directly opposing an upper wall of the pump chamber, in particular forming free spaces between the blades being open in axial direction and covered by the said upper wall of the pump chamber.