| Analytical modeling and numerical simulation of forces in an endoluminal graft. | |
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MedLine Citation:
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PMID: 11552728 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To utilize mathematical analysis and computational fluid dynamics (CFD) to investigate the forces acting within the pressurized aorta and upon a stent-graft and how these forces may affect the ongoing performance of the stent-graft. METHODS: Analytical force balance analysis and CFD simulations using the Fluent code were used to mimic blood flow through a bifurcated stent-graft in a person at rest. Steady-state blood flow was assumed in which the inlet pressure approximated the mean blood pressure (100 mm Hg) and the blood flow velocity was an approximation of the peak systolic flow rate (0.6 m/s). Two sizes of endoluminal grafts were analyzed: the larger graft had an inlet diameter of 3 cm and outlet diameters of 1 cm; the smaller graft diameters measured 2.4 cm proximally and 1.2 cm distally. The endografts were studied in 2 configurations: with the limbs straight and with one bent. RESULTS: For the larger graft model, the normal peak blood flow induced a downward force of 7 to 9 N on the bifurcated grafts. Bending one of the limbs of the graft produced a sideways force of 1.3 N. For the smaller endograft, the downward force was in the range of 3.1 to 5.1 N and the sideways force on a curved limb was approximately 1.5 N. The magnitude of the forces given by the analytical formulae and the CFD results agreed to within 2 significant figures. CONCLUSIONS: These results suggest that the downward force on a bifurcated stent-graft, which may exceed the force required to dislodge it when relying on radial attachment alone, is determined mostly by the proximal graft diameter. Curvature of the graft limbs creates an additional sideways force that works to displace the distal limbs of the graft from the iliac arteries. |
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Authors:
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K Liffman; M M Lawrence-Brown; J B Semmens; A Bui; M Rudman; D E Hartley |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of endovascular therapy : an official journal of the International Society of Endovascular Specialists Volume: 8 ISSN: 1526-6028 ISO Abbreviation: J. Endovasc. Ther. Publication Date: 2001 Aug |
Date Detail:
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Created Date: 2001-09-12 Completed Date: 2002-01-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100896915 Medline TA: J Endovasc Ther Country: United States |
Other Details:
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Languages: eng Pagination: 358-71 Citation Subset: IM |
Affiliation:
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Thermal and Fluids Engineering, CSIRO/BCE, Highett, Victoria, Australia. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Angioplasty*
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instrumentation Aortic Aneurysm, Abdominal / physiopathology, surgery Blood Flow Velocity / physiology Blood Pressure / physiology Blood Vessel Prosthesis Implantation / instrumentation Cross-Sectional Studies Extremities / blood supply Humans Models, Theoretical* Numerical Analysis, Computer-Assisted* Stents Vascular Patency / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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