Evaluation of an aortic valve prosthesis: Fluid-structure interaction or structural simulation?

Abstract:

:Bio-inspired polymeric heart valves (PHVs) are excellent candidates to mimic the structural and the fluid dynamic features of the native valve. PHVs can be implanted as prosthetic alternative to currently clinically used mechanical and biological valves or as potential candidate for a minimally invasive treatment, like the transcatheter aortic valve implantation. Nevertheless, PHVs are not currently used for clinical applications due to their lack of reliability. In order to investigate the main features of this new class of prostheses, pulsatile tests in an in-house pulse duplicator were carried out and reproduced in silico with both structural Finite-Element (FE) and Fluid-Structure interaction (FSI) analyses. Valve kinematics and geometric orifice area (GOA) were evaluated to compare the in vitro and the in silico tests. Numerical results showed better similarity with experiments for the FSI than for the FE simulations. The maximum difference between experimental and FSI GOA at maximum opening time was only 5%, as compared to the 46.5% between experimental and structural FE GOA. The stress distribution on the valve leaflets clearly reflected the difference in valve kinematics. Higher stress values were found in the FSI simulations with respect to those obtained in the FE simulation. This study demonstrates that FSI simulations are more appropriate than FE simulations to describe the actual behaviour of PHVs as they can replicate the valve-fluid interaction while providing realistic fluid dynamic results.

journal_name

J Biomech

journal_title

Journal of biomechanics

authors

Luraghi G,Wu W,De Gaetano F,Rodriguez Matas JF,Moggridge GD,Serrani M,Stasiak J,Costantino ML,Migliavacca F

doi

10.1016/j.jbiomech.2017.04.004

subject

Has Abstract

pub_date

2017-06-14 00:00:00

pages

45-51

eissn

0021-9290

issn

1873-2380

pii

S0021-9290(17)30202-6

journal_volume

58

pub_type

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