Numerical comparison of the closing dynamics of a new trileaflet and a bileaflet mechanical aortic heart valve

Li, Chi-Pei; Lu, Po‐Chien

doi:10.1007/s10047-012-0650-8

Cited by 22 publications

(24 citation statements)

References 22 publications

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“…10 The TFUR design aims at reduced thrombogenicity (not requiring anticoagulation therapy) while maintaining the high durability of mechanical valves. 10,[15][16][17][18][19][20] The geometric orifice area (GOA) and its evolution over a pulse cycle is a frequently used metric for studying the kinematics of heart valves. [11][12][13][14] Although being valuable for a global analysis of the valve kinematics, this parameter has some limitations that are often overlooked: GOA is unable to capture asynchronous leaflet motion and does not provide any information on the out-of-plane velocity component of the leaflet motion.…”

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confidence: 99%

Leaflet Kinematics of Mechanical and Bioprosthetic Aortic Valve Prostheses

et al. 2018

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The hemodynamic performance of artificial aortic valves (AVs) and the probability for structural valve deterioration can be linked to the valve kinematics. Comparability among different studies is limited because of variations in the experimental setups and physiologic boundary conditions. This study presents results of kinematic measurements of bioprosthetic and mechanical AVs that were tested in an identical experimental setting such that they can be directly compared with each other. The kinematics of AVs is typically presented in the form of the geometric orifice area and its temporal evolution. These parameters cannot capture asynchronous leaflet motion and out-of-plane leaflet velocity. In this work, each leaflet was tracked individually for a more detailed understanding of the leaflet kinematics, asynchronous leaflet motion, and leaflet tip velocities. A bioprosthetic valve, Edwards INTUITY (EINT), and two mechanical valves, Medtronic ADVANTAGE (MADV) and a Lapeyre-Triflo FURTIVA (TFUR), were tested in a compliant model of the aortic root in a physiologic flow loop. TFUR and MADV opened alike with maximum leaflet tip velocities of 0.77 and 0.66 m/s, respectively. The opening of EINT showed significantly higher local in-plane leaflet velocities of more than 2 m/s. EINT and TFUR exhibited similar early and slow closure. MADV closed significantly later with increased velocity. TFUR had a median maximum leaflet tip velocity of 0.39 m/s during valve closure and that of MADV was 0.83 m/s, whereas EINT exhibited a median maximum local in-plane leaflet velocity of 0.37 m/s. EINT experienced leaflet fluttering during systole with a flapping frequency of 36 Hz.

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confidence: 99%

Leaflet Kinematics of Mechanical and Bioprosthetic Aortic Valve Prostheses

et al. 2018

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“…In terms of viscous model, simulations of BMHV involving FSI can basically be categorized as laminar model and direct numerical simulation (DNS). The former approach neglects turbulence and the mesh deformation is solved using the ALE approach provided by the CFD solver FLUENT in [ 7 – 9 , 23 , 26 , 27 ], which was adopted in the current study. The DNS approach adopts the fixed grid method with a much higher grid number in the order of 10 7 , and the simulations were conducted using in-house code [ 1 , 3 , 12 , 31 , 48 – 50 ].…”

Section: Discussionmentioning

confidence: 99%

“…Intermediate remeshing is necessary when a large deformation is involved such as rotating heart valve leaflets. For the numerical simulations of mechanical heart valves and heart ventricles, ANSYS FLUENT software is the most widely used CFD solver using ALE approach and the corresponding experimental validations have been conducted using Particle Image Velocimetry (PIV) [ 6 , 7 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Intraventricular Flow during Diastole after Implantation of BMHV

Kabinejadian

Phang

et al. 2015

PLoS ONE

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This work presents a numerical simulation of intraventricular flow after the implantation of a bileaflet mechanical heart valve at the mitral position. The left ventricle was simplified conceptually as a truncated prolate spheroid and its motion was prescribed based on that of a healthy subject. The rigid leaflet rotation was driven by the transmitral flow and hence the leaflet dynamics were solved using fluid-structure interaction approach. The simulation results showed that the bileaflet mechanical heart valve at the mitral position behaved similarly to that at the aortic position. Sudden area expansion near the aortic root initiated a clockwise anterior vortex, and the continuous injection of flow through the orifice resulted in further growth of the anterior vortex during diastole, which dominated the intraventricular flow. This flow feature is beneficial to preserving the flow momentum and redirecting the blood flow towards the aortic valve. To the best of our knowledge, this is the first attempt to numerically model intraventricular flow with the mechanical heart valve incorporated at the mitral position using a fluid-structure interaction approach. This study facilitates future patient-specific studies.

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“…Computational and in vitro studies indicated that this valve closes much slower than bi-leaflet valves and similar to the closing mode of a tissue valve (Fig. 1) [7,8]. Studies using micro-PIV were unable to identify any critical zones of excessive shear in the pivoting region, suggesting a lower thrombogenic potential compared to classical recessed hinge designs [9].…”

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confidence: 83%