Blood pump

A blood pump, comprising:

• a blade impeller with a rotational axis in a pump housing;
• the blade impeller comprising an impeller body, impeller blades, and a shroud, said shroud being permanently joined to the impeller blades at the outer rim of the blade contour;
• a main flow being provided between the impeller body and the shroud;
• a first element that comprises a fluid-mechanical radial bearing based on a Lomakin effect between the shroud and the pump housing;
• a second element physically separated from the first element, the second element comprising a radial magnetic bearing, the radial magnetic bearing comprising an electromagnetic radial bearing or a permanent magnetic radial bearing and the radial magnetic bearing is formed by a magnetic coupling;
• the blood pump comprising an hydrodynamic axial bearing between the impeller and the pump housing, the hydrodynamic axial bearing being based on fluid-mechanical forces;
• the impeller body exhibits a central rinsing channel;
• the blade impeller comprising a secondary set of blades, the secondary set of blades being provided at a rear of the impeller;
• the secondary set of blades inducing another centrifugal flow in such a manner that, due to the centrifugal forces that act in the secondary set of blades, a portion of the main flow is branched off as rinsing flow via a rinsing channel and is conveyed in a side space radially towards the outside until the rinsing flow finally once again enters the main flow in a high-pressure zone at the impeller outlet;
• and
• the impeller being axially supported in the pump housing in such a way that the rinsing flow is concurrently employed as a bearing flow for the hydrodynamic axial bearing.