This can be modeled by applying dynamic pressure loads (corresponding to loads measured in the aorta and left ventricle) directly onto the leaflets, which is an improvement in accuracy compared to previous analyses that used only static load conditions.Įven this method, however, does not account for the inertial and viscous effects of blood contacting the leaflets during flow. The pressure on the aorta side of the leaflets is lower than that on the ventricular side when the ventricle is pumping oxygenated blood into the aorta, and the pressure on both sides varies depending on the stage of the cardiac cycle. The operating conditions of the aortic valve are complex. Accurate stress analysis of the valve during operation is therefore essential for designing durable aortic valves and improving patient outcomes. This can cause fatigue failure of the leaflets, compromising valve function and potentially affecting the patient. Surgically implanted or transcatheter-delivered bioprosthetic aortic valve leaflets undergo dynamic cyclic loading and large deformation during the cardiac cycle. Either condition can eventually require the implantation of a prosthetic valve to replace the underperforming original. There are two principal modes of aortic valve disease: aortic stenosis, in which the valve no longer fully opens, and aortic regurgitation, in which the valve no longer fully closes. This application note will detail how the SPH technique was used to determine the FSI response of a generic prosthetic heart valve. The smoothed particle hydrodynamic (SPH) analysis method overcomes this difficulty. 1 – Leaflet material test data and Marlow model representation. 2 Fluidstructure interaction (FSI) studies are less common, in part because the closure of the valve creates CFD domain pinching. Finite element (FE) studies have been used to estimate peak stresses in valves, 1 and computational fluid dynamics (CFD) studies have been used to model blood flow around valves. Assessment of fatigue life requires accurate estimates of the stresses induced during the cardiac cycle. Durability is a key measurement of prosthetic heart valve function.

Abaqus fsi heart valve