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research-article

Comparative study of wall shear stress at the ascending aorta for different mechanical heart valve prostheses

[+] Author and Article Information
Qianhui Li

School of Mathematics, Computer Science and Engineering, City, University of London, Northampton square, London, EC1V 0HB, UK
qianhui.li@city.ac.uk

Franziska Hegner

Institute of Mechanics and Fluid Dynamics, Technical University Bergakademie Freiberg, Freiberg, Germany
franziska.hegner@extern.tu-freiberg.de

Christoph Bruecker

School of Mathematics, Computer Science and Engineering, City, University of London, Northampton square, London, EC1V 0HB, UK
christoph.bruecker@city.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4043357 History: Received July 04, 2018; Revised March 19, 2019

Abstract

An experimental study is reported which investigates the wall shear stress (WSS) distribution in a transparent model of the human aorta comparing a SJM Regent bileaflet mechanical heart valve (BMHV) with the Lapeyre-Triflo FURTIVA trileaflet mechanical heart valve (TMHV) in physiological pulsatile flow. Elastic micro-pillar structures, calibrated as WSS sensors by micro-Particle-Image-Velocimetry measurement, are applied to the wall along the ascending aorta (AAo). The peak WSS values in the BMHV are observed to be almost twice that of the values seen in the TMHV. Flow field analysis illuminates that these peaks are linked to the jet-like flows generated in the valves interacting with the aortic wall. Not only the magnitude, but also the impact regions are specific for different valve designs. The side-orifice jets generated by the BMHV travel along the aortic wall in the AAo, impacting the wall throughout the AAo. Whereas the jets generated by TMHV impact further downstream in the AAo and results in a reduced WSS.

Copyright (c) 2019 by ASME
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