Yee Han Kuan1, Vinh-Tan Nguyen2, Foad Kabinejadian1, Hwa Liang Leo1
1Department of Biomedical Engineering, National University of Singapore, 2Institute of High Performance Computing, A*STAR Singapore
Background and aim of the study: The trileaflet heart valve is a more desirable mechanical heart valve due to its similarity to native heart valves, which produce a central blood flow with decreased blood flow disturbance. There are, however, many challenges and difficulties in designing a trileaflet valve, mainly due to a greater number of moving mechanical parts.
Methods: The flow profiles through a bileaflet mechanical heart valve (BMHV) and a trileaflet mechanical heart valve (TMHV) were compared at downstream regions. Geometric models of a 29 mm St. Jude Medical BMHV and a TMHV were used and positioned at the anatomic position in a curved aortic downstream geometry. Three-dimensional numerical simulations for both types of mechanical heart valve were performed under normal physiological pulsatile
flow conditions. Flow profiles were studied under three different implantation locations at Z = 1D (D = 29 mm inlet diameter), 2D and 4D along the aorta centreline during peak systole.
Results: The simulation results showed different flow fields at the downstream positions at Z = 1D and 2D. The leaflets of the BMHV obstructed the flow, while the TMHV allowed a central orifice flow which resulted in a more physiological flow profile. Further downstream, at Z = 4D, the flow fields shared similarities in terms of the flow profile and velocity magnitude.
Conclusion: The findings of this study may help to further improve the development of the TMHV.
The Journal of Heart Valve Disease 2015;24:393-403
|Computational Hemodynamic Investigation of Bileaflet and Trileaflet Mechanical Heart Valves|
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