Abstract
We have developed a hydrodynamic levitation centrifugal blood pump with a semi-open impeller for a mechanically circulatory assist. The impeller is levitated with original hydrodynamic bearings without any complicated control and sensors. In this paper, in order to improve the hemocompatibility of the developed blood pump, we studied the hydrodynamic step bearing using the numerical analysis based on Reynolds equation and the measurement test of the hydrodynamic force. As a result, we found that the step bearing having the step length of 66% of the vane generated the maximum hydrodynamic force, and was able to improve the hemocompatibility.
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