| Numerical investigation of the performance of three hinge designs of bileaflet mechanical heart valves. | |
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MedLine Citation:
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PMID: 20571852 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Thromboembolic complications (TECs) of bileaflet mechanical heart valves (BMHVs) are believed to be due to the nonphysiologic mechanical stresses imposed on blood elements by the hinge flows. Relating hinge flow features to design features is, therefore, essential to ultimately design BMHVs with lower TEC rates. This study aims at simulating the pulsatile three-dimensional hinge flows of three BMHVs and estimating the TEC potential associated with each hinge design. Hinge geometries are constructed from micro-computed tomography scans of BMHVs. Simulations are conducted using a Cartesian sharp-interface immersed-boundary methodology combined with a second-order accurate fractional-step method. Leaflet motion and flow boundary conditions are extracted from fluid-structure-interaction simulations of BMHV bulk flow. The numerical results are analyzed using a particle-tracking approach coupled with existing blood damage models. The gap width and, more importantly, the shape of the recess and leaflet are found to impact the flow distribution and TEC potential. Smooth, streamlined surfaces appear to be more favorable than sharp corners or sudden shape transitions. The developed framework will enable pragmatic and cost-efficient preclinical evaluation of BMHV prototypes prior to valve manufacturing. Application to a wide range of hinges with varying design parameters will eventually help in determining the optimal hinge design. |
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Authors:
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Hélène A Simon; Liang Ge; Fotis Sotiropoulos; Ajit P Yoganathan |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2010-06-23 |
Journal Detail:
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Title: Annals of biomedical engineering Volume: 38 ISSN: 1521-6047 ISO Abbreviation: Ann Biomed Eng Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-10-05 Completed Date: 2011-01-21 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0361512 Medline TA: Ann Biomed Eng Country: United States |
Other Details:
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Languages: eng Pagination: 3295-310 Citation Subset: IM |
Affiliation:
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School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Heart Valve Prosthesis* Heart Valves / anatomy & histology, physiology* Humans Models, Cardiovascular* Thromboembolism / prevention & control |
| Grant Support | |
ID/Acronym/Agency:
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R01-HL-070262/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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