Blutpumpe als Zentrifugalpumpe

摘要

PCT No. PCT/EP94/02049 Sec. 371 Date Dec. 22, 1995 Sec. 102(e) Date Dec. 22, 1995 PCT Filed Jun. 23, 1994 PCT Pub. No. WO95/00185 PCT Pub. Date Jan. 5, 1995In a pump housing (10), the blood pump comprises an impeller (13) with a flat plate (30) and blades (34) projecting therefrom. The impeller (13) is supported between balls (18,20) forming an axial sliding bearing. The front wall (35) and the back wall (14) of the pump housing extend substantially parallel to the plate (30) of the impeller (13). The height of the blades (34) linearly decreases with increasing radius so that the gap between the front wall (35) and the blades (34) increases outwards. Since the circumferential speed increases as well, the shearing rate remains constant. Between the plate (30) of the impeller and the back wall (14), a gap of constant width is provided, in which secondary flows are produced, thereby avoiding dead water zones.