چكيده به لاتين
The heart valve is a very important organ in the proper functioning of the heart. In many cases, it has been observed that this organ does not perform properly for various reasons, which is an important factor in the occurrence of cardiovascular complications and deaths. Since the first heart valve replacement, more than 50 designs for artificial heart valves have been introduced and manufactured, which basically differ from each other in valve geometry, number of leaflets, and materials. The current alternative to the artificial valve is bioprosthetic and mechanical valves. one of the best alternatives to the artificial heart valve in terms of efficiency is St Jude model. it is one of the most widely used heart valves among different models. One of the main problems of bileaflet mechanical heart valves is not being able to change the leaflets without replacing the valve completely. If the surface of the leaflet is damaged for any reason and the coating on it is destroyed, the valve becomes practically unusable and must be completely replaced with a lot of damage to the vein tissue and also prolonging the surgery time. Considering that none of the currently used valves have a suitable design for replacing the valve leaflet, in this research we are trying to introduce a hinge model so that this feature can be added to the valve. For this purpose, after reading the articles and checking the various valve design cases and its important points, various models have been designed with the help of Geomagic design X and SolidWorks software. In each design, the leaflet or metal ring or both have undergone changes, each of which has advantages and disadvantages. By studying the positive and negative points of each model and their importance in the design, one of the models has been selected as the best model. Further, the correctness of the performance of the selected model was checked by modeling in Ansys software, and finally, the selected model was selected in terms of modeling results, stresses and the way of blood flow was evaluated and the results were all within the acceptable range.
