Document Detail


Evaluation of the impeller shroud performance of an axial flow ventricular assist device using computational fluid dynamics.
MedLine Citation:
PMID:  20883393     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Generally, there are two types of impeller design used in the axial flow blood pumps. For the first type, which can be found in most of the axial flow blood pumps, the magnet is embedded inside the impeller hub or blades. For the second type, the magnet is embedded inside the cylindrical impeller shroud, and this design has not only increased the rotating stability of the impeller but has also avoided the flow interaction between the impeller blade tip and the pump casing. Although the axial flow blood pumps with either impeller design have been studied individually, the comparisons between these two designs have not been conducted in the literature. Therefore, in this study, two axial flow blood pumps with and without impeller shrouds were numerically simulated with computational fluid dynamics and compared with each other in terms of hydraulic and hematologic performances. For the ease of comparison, these two models have the same inner components, which include a three-blade straightener, a two-blade impeller, and a three-blade diffuser. The simulation results showed that the model with impeller shroud had a lower static pressure head with a lower hydraulic efficiency than its counterpart. It was also found that the blood had a high possibility to deposit on the impeller shroud inner surface, which greatly enhanced the possibility of thrombus formation. The blood damage indices in both models were around 1%, which was much lower than the 13.1% of the axial flow blood pump of Yano et al. with the corresponding experimental hemolysis of 0.033 g/100 L.
Authors:
Boyang Su; Leok P Chua; Tau M Lim; Tongming Zhou
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article    
Journal Detail:
Title:  Artificial organs     Volume:  34     ISSN:  1525-1594     ISO Abbreviation:  Artif Organs     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-10-01     Completed Date:  2011-01-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802778     Medline TA:  Artif Organs     Country:  United States    
Other Details:
Languages:  eng     Pagination:  745-59     Citation Subset:  IM    
Copyright Information:
© 2010, Copyright the Authors. Artificial Organs © 2010, International Center for Artificial Organs and Transplantation and Wiley Periodicals, Inc.
Affiliation:
School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore. templesu@gmail.com
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MeSH Terms
Descriptor/Qualifier:
Computer Simulation*
Heart-Assist Devices* / adverse effects
Hemolysis
Humans
Magnetics
Materials Testing
Models, Cardiovascular*
Numerical Analysis, Computer-Assisted*
Pressure
Prosthesis Design*
Rotation
Thrombosis / etiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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