Blood pump as centrifugal pump
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United States of America Patent
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-
May 5, 1998
Grant Date -
N/A
app pub date -
Dec 22, 1995
filing date -
Jun 25, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In 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.
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