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TECHNICAL PAPERS: Soft Tissues

Geometrical Stress-Reducing Factors in the Anisotropic Porcine Heart Valves

[+] Author and Article Information
X. Y. Luo

Department of Mechanical Engineering, University of Sheffield, Sheffield, S1 3JD, UK

W. G. Li

Hydraulic Machinery Division, Gansu University of Technology, 730050, Lanzhou, P.R. China

J. Li

School of Civil Engineering and Mechanics, Xi’an Jiaotong University, 710049, Xi’an, P. R. China

J Biomech Eng 125(5), 735-744 (Oct 09, 2003) (10 pages) doi:10.1115/1.1614821 History: Revised April 09, 2003; Online October 09, 2003; Received October 28, 2003
Copyright © 2003 by ASME
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References

Figures

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The top view (left) and the side view (right) of the porcine valve leaflet. The leaflet takes the form of an elliptic paraboloid.
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(left) The fibre orientations and (right) the finite element model (only half of the leaflet is computed) with 900 nodes. As three nodes are used along the shell thickness, there are three layers in the finite element model.
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Representative stress-strain curves in the circumferential and radial directions for fresh porcine valve measured by Mavrilas & Missirlis 17. The stress-strain curve for the corresponding isotropic model is taken as the average of the two curves, as shown in the middle.
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The variation in thickness of the porcine valves. The thickness counters are based on the measurements by Clark & Finke 27.
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The stress contours for porcine valves with a uniform thickness. Top: longitudinal normal stress; middle: transverse normal stress; and bottom: in-plane shear stress. d=27.8 mm, h=19 mm. The values on the contours are given in kPa.
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The longitudinal normal stress contours on the top surface of a porcine valves with uniform thickness for d=27.8 mm, and (a) h=14 mm, (b) h=19 mm, (c) h=24 mm, and (d) h=28 mm. The values on the contours are given in kPa.
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The stress contours for porcine valves with a non-uniform thickness. Top: longitudinal normal stress; middle: transverse normal stress; and bottom: in-plane shear stress. d=27.8 mm,h=19 mm. The values on the contours are given in kPa.
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The longitudinal normal stress contours on the top-surface of a porcine valve with the nonuniform thickness, and for d=27.8 mm, and (a) h=14 mm, (b) 19 mm, (c) 24 mm, and (d) 28 mm. The values on the contours are given in kPa.
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The peak longitudinal normal stress versus the stent height for porcine valves with three different diameters. The solid curves are results from the anisotropic valves, and the dashed ones are for the corresponding isotropic valves.
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The peak transverse normal stress versus the stent height for porcine valves with three different diameters. The solid curves are results from the anisotropic valves, and the dashed ones are for the corresponding isotropic valves.
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The peak in-plane shear stress versus the stent height for porcine valves with three different diameters. The solid curves are results from the anisotropic valves, and the dashed ones are for the corresponding isotropic valves.
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The variation of the area of the valve with the stent height for the three different diameters used

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