Experimental and Numerical Investigation of the Performance and Shear Stresses in a Nutating Centrifugal Blood Pump
Conventional centrifugal blood pumps may allow infection through the rotational shaft seal. In addition, higher temperatures and shear stresses caused by seal friction can increase thrombus and hemolysis, respectively. The nutating centrifugal blood pump or “teaspoon pump,” shown in Figure 1, uses a nutating (no rotating) impeller, which can overcome these weaknesses. But this type of pump has only one impeller for its mechanism. It must be operated at a high rotational speed to achieve the required volume rate and blood pressure. The mount of mechanical hemolysis caused by this high velocity must be quantified. Damage to red blood cells is directly proportional to the intensity and duration of the shearing stresses to which they are submitted.
KeywordsVortex Convection Vorticity
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- 1.Akamatsu T, Shiroyama T, Fukumasu H: Development of nutating centrifugal blood pump. Proceedings of the 2nd International Symposium on Artificial Heart and Assist Device, August 1314,1987, Tokyo Japan.Google Scholar
- 3.Havlik P, Colin S, Bellet D, et al: Hydrodynamic study with a view to minimizing hemolysis in a volumetric rotary pump. ISAO International workshop on rotary blood pumps, Proceedings, pp 3944, 1988.Google Scholar
- 4.Bagheri MR, Adler U: Messung von Geschwindigkeiten in einem Modell einer Blutkreiselpumpe. Diplomarbeit, FU Berlin, 1987.Google Scholar
- 5.Hellums JD, Brown CH: Blood cell damage by mechanical forces. In: Hwang NH (ed): Cardiovascular Flow Dynamics and Measurements. University Park Press pp 799–823, 1977.Google Scholar