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Computational Fluid Dynamics‐Based Hydraulic and Hemolytic Analyses of a Novel Left Ventricular Assist Blood Pump
Author(s) -
Yang XiaoChen,
Zhang Yan,
Gui XingMin,
Hu ShengShou
Publication year - 2011
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.2011.01203.x
Subject(s) - impeller , shroud , computational fluid dynamics , diffuser (optics) , nozzle , ventricular assist device , mechanical engineering , materials science , engineering , mechanics , physics , cardiology , medicine , heart failure , light source , optics
The advent of various technologies has allowed mechanical blood pumps to become more reliable and versatile in recent decades. In our study group, a novel structure of axial flow blood pump was developed for assisting the left ventricle. The design point of the left ventricular assist blood pump 25 (LAP‐25) was chosen at 4 Lpm with 100 mm Hg according to our clinical practice. Computational fluid dynamics was used to design and analyze the performance of the LAP‐25. In order to obtain a required hydraulic performance and a satisfactory hemolytic property in the LAP‐25 of a smaller size, a novel structure was developed including an integrated shroud impeller, a streamlined impeller hub, and main impeller blades with splitter blades; furthermore, tandem cascades were introduced in designing the diffuser. The results of numerical simulation show the LAP‐25 can generate flow rates of 3–5 Lpm at rotational speeds of 8500–10 500 rpm, producing pressure rises of 27.5–148.3 mm Hg with hydraulic efficiency points ranging from 13.4 to 27.5%. Moreover, the fluid field and the hemolytic property of the LAP‐25 were estimated, and the mean hemolysis index of the pump was 0.0895% with Heuser's estimated model. In conclusion, the design of the LAP‐25 shows an acceptable result.