Numerical Simulation Of Hemodynamics After Reconstruction Of Aortic Valve In Children

Clinical surgical procedures for aortic roots are based on the experience of clinicians.However,there is no theoretical basis for the postoperative remodeling of aortic root structures in terms of biomechanical behavior and postoperative aortic root development.Especially for juvenile patients,when valves are transplanted and replaced,the aortic root diameter of the growth state expands and the non-growth state of the transplanted valve has a risk of incomplete closure again as the human body grows.For the pediatric patient population,the design of the aortic valve geometry requires further analysis of the biomechanical mechanism.it is can to guide the evidence-based surgical decision-making and prevent or reduce the new postoperative reconstruction aortic valve appears to have a chance of reappearance of insufficiency.This study investigated the effects of different aortic valve heights on the opening and closing properties of reconstructed aortic roots and the adaptability of different aortic valve heights to the diameter expansion of the aortic root.Focusing on the use of the finite element software numerical simulation method,by setting the properties of pressure,damping,leaflet contact and material to simulate the normal physiological environment of the human body in the structural dynamics of the aortic valve;By this way to establish a three-dimensional increase/decrease aortic valve with the valve height ±0.5 mm in the aortic root with a diameter of 26 ? 30 mm.Through the analysis of the aortic root maximum stress value,position distribution,valve opening area,leaflet force and other related aortic root valve opening and closing performance evaluation indicators,this study are comparing the aortic root structure data,analysis conclusions provided in the related literature and combining with the views of clinicians to put forward a reasonable application of aortic root surgery planning.The results of this study : First,under the diameter of the aortic valve,we find the difference in the height of the aortic valve has an effect on the aortic valve closure performance.Too small or too high valve height will reduce the aortic systolic valve area of the mouth and affect the function of aortic closure.In the study we find the diameter of the aortic root adapted to 26 mm was between 13.5 mm and 15 mm.Second,four different aortic with the valve height of 13.5 ? 15 mm in the "growth state" of the aortic root in the study process,found that when the aortic valve height H is 13.5 mm to adapt to the root diameter of 26 ? 27 mm;H is 14 mm to adapt the rootdiameter of 26?28 mm;H is 14.5 mm to adapt the root diameter of 26?30 mm,which is the optimal height design of the aortic valve;H is 15 mm to adapt to the root Diameter range of 28 ? 30 mm.This study found that the height of the valve aortic in the different aortic root diameter have different adaptability.The overall advantage is that the greater the height of the valve,the more adaptable to the growing state of the aortic root state.However,the adaptability of the height of the valve should be taken into consideration in designing the size of the transplanted aortic valve in different diseased individuals so as to obtain an ideal post-operative aortic root movement and to slow or avoid reoperation when considering differences children's bodies.The above-mentioned theoretical analysis results obtained from the study can help clinicians formulate an aortic root valve transplantation surgery program efficiently,scientifically,and with reasonable justification,providing detailed pathological information for doctors and patients,and avoiding doctors and patients with the disputes.