Patent ID: 9616157
Date: 2017-04-11
CPC Classifications: A61M,F04D,F16C

Claim:
1. 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.