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Fluid-structure interaction in the aortic heart valve

Authors
Publisher
TUE : Materials Technology (Mate) group
Publication Date
Disciplines
  • Biology
  • Computer Science
  • Engineering
  • Mathematics
  • Medicine

Abstract

poster01.dvi 12 /department of biomedical engineering PO Box 513, 5600 MB Eindhoven, the Netherlands Fluid-Structure Interaction in the Aortic Heart Valve Jurgen de Hart, Gerrit W.M. Peters, Piet J.G. Schreurs and Frank P.T. Baaijens Eindhoven University of Technology, Department of Biomedical Engineering Introduction Quality of life improves if a diseased heart valve is replaced by a prosthesis. However, no substitute is yet able to adopt the physiological performance and durability of the natural valve. Clinical assessment of a prosthesis requires that both mechanical and hemodynamical aspects are evaluated. A computational fluid-structure interaction model has been de- veloped, which enables to predict valve (mal)functioning. aortic ring ao rt ic ro ot commissure aorta leaflets sinus free edge sinus commissure Figure 1 Schematic drawings of the aortic heart valve. Methods A Lagrangemultiplier based fictitious domain formulation [1] is integrated within the finite element method. Key features of this numerical strategy are: ✷ Conventional mathematical discriptions ✷ Fully coupled approach ✷ Interaction through kinematical constraints:∫ γ �λ · (�vf − �vs) dγ = 0. The leaflets are fiber-reinforced, resembling the natural com- posite texture, while the aortic root may be approximated with a linear elastic model. Time-dependent physiological realistic flow and aortic pressures are applied at the in- and outflow plane. Results A global assessment of the blood-valve interaction is given in Fig. 2. The valve leaflets move as a respons to blood flow. The opening and closing configurations differ significantly. Figure 2 Blood-valve interaction for three distinct points in time. Leaflet stresses are an important measure for possible tis- sue degeneration. The effect of fiber-reinforcement on these stresses is illustrated in Fig. 3. Results show that leaflet ma- trix stresses are reduced up to 63% if fiber-reinfocement is employed. Moreover, a much smoothe

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