Flow Dynamics in an End-to-End Vascular Graft Junctionby Y. H. Kim, Univ of Iowa, Iowa City, United States,
K. B. Chandran, Univ of Iowa, Iowa City, United States,
Abstract: A study consisting of both experimental and numerical methods was performed to determine flow dynamics in the vicinity of an end-to-end anastomosis. The experimentally determined geometries were used to simulate steady flow through an end-to-end anastomosis using the finite analytic (FA) numerical method in order to obtain solutions for the governing axisymmetric laminar flow equations. Wall shear stresses in the vicinity of end-to-end anastomoses under steady flow conditions were measured using a flush-mounted hot-film anemometer (FMHFA) probe. The experimental measurements were in agreement with numerical results. Wall shear stresses increased proximal to the anastomosis in flow from the Penrose tubing to the PTFE graft. In flow from the PTFE graft to the Penrose tubing, low wall shear stresses were observed distal to the anastomosis. The present study suggests a correlation between regions of low wall shear stress and the development of anastomotic neointimal fibrous hyperplasia (ANFH) in end-to-end anastomoses.
Subject Headings: Shear walls | Shear stress | Finite element method | Flow simulation | Laminar flow
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