Key result
Mechanical heart valves with compliant leaflets demonstrated smaller regurgitant volumes and smaller shear stresses than those with rigid leaflets in fluid dynamics simulations.
Why the study?
Do compliant leaflets reduce regurgitant volume and shear stress in mechanical heart valves compared to rigid leaflets?
Do compliant leaflets reduce regurgitant volume and shear stress in mechanical heart valves compared to rigid leaflets?
Computational modeling suggests that incorporating compliant materials in mechanical heart valves may improve hemodynamics by reducing regurgitant volume and shear stress.
Answers are grounded in this paper and cite their sources.
Encourages preclinical development of compliant-leaflet mechanical valves; hypothesis-generating pending in vivo validation.
In this work, we examine the dynamics of fluid flow in a mechanical heart valve when the solid inertia and leaflet compliance are important. The fluid is incompressible and Newtonian, and the leaflet is an incompressible neo-Hookean material. In the case of an inertialess leaflet, we find that the maximum valve opening angle and the time that the valve remains closed increase as the shear modulus of the leaflet decreases. More importantly, the regurgitant volume decreases with decreasing shear modulus. When we examined the forces exerted on the leaflet, we found that the downward motion of the leaflet is initiated by a vertical force exerted on its right side and, later on, by a vertical force exerted on the top side of the leaflet. In the case of solid inertia, we find that the maximum valve opening angle and the regurgitant volume are larger than in the case of an inertialess leaflet. These results highlight the importance of solid compliance in the dynamics of blood flow in a mechanical heart valve. More importantly, they indicate that mechanical heart valves with compliant leaflets may have smaller regurgitant volumes and smaller shear stresses than the ones with rigid leaflets.
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Gkanis et al. (2011) studied Mechanical heart valve fluid dynamics. Compliant leaflets vs. Rigid leaflets was evaluated on Regurgitant volume and shear stress. Mechanical heart valves with compliant leaflets demonstrated smaller regurgitant volumes and smaller shear stresses than those with rigid leaflets in fluid dynamics simulations.
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