Centrifugal blood pump with tapered shaft seal
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United States of America Patent
Stats
-
Aug 19, 1986
Grant Date -
N/A
app pub date -
Jul 9, 1984
filing date -
Jul 9, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A centrifugal blood pump has a tapered seal between a pump housing wall and a hub of an impeller which provides a fluid tight seal interface surrounding a drive shaft which is connected to the impeller and which extends through the pump housing wall. The tapered seal has a maximum radial dimension adjacent to the wall and a minimum radial dimension adjacent the hub so that air bubbles (which seek the smallest shaft diameter) will not insulate the seal interface edges from fluid flow. The seal interface, which is perpendicular to the drive shaft axis, is located in a high flow area between the wall and the hub to increase cooling effects.
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