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Modeling of Different Geometries of Children's Heart Occluder's by Finite Element Method

Mousavizadeh, Mohammad Hossein | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53957 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arghavani, Jamal
  7. Abstract:
  8. Congenital heart defects are a type of heart diseases that some babies get at birth. These diseases generally have symptoms such as shortness of breath, headache, impaired blood supply, hyperplasia of the lungs, enlarged heart, and so on. In the past, open heart surgery was commonly used to treat such diseases, which was a costly and risky procedure. But over time, occluders made it easier. An occluder is referd to a device that is generally minimally invasive in the area of the fault and could block it. The occluders are usually braided type, with inside polyethylene fibers, where tissues can grow and clogs the defect over time. Although occluders have greatly increased the success rate of operations, they however have side effects that require continuous improvement, both in design and in the materials. In this research, we try to generate a simple braided model by riving equations of a tubular stent. Given that the existing models for braided structures are limited and the wires generally overlap with each other, it is necessary to create an accurate model that can be used in this and future researches. Using the model produced for the braided stent and creating molds based on the actual geometry of a occluders, a model for the occluder is then created. After creating the crimping die model, it is analyzed to evaluate the performance of the model and also to investigate sensivity to the parameters. Force-displacement test is used for analysis. After analyzing the models with different wire diameters and braiding angles with the help of genetic algorithm and analysis of variance, the importance of the factors in this study is investigated. Finally, according to the important factors in the performance of an occluder, a model with optimal parameters is presented. The result of this study indicates that the model with a braiding angle of 45 degrees and a wire diameter of 0.003 inches is the most suitable model in terms of fulfilling all the functions of the studied objectives
  9. Keywords:
  10. Finite Element Model ; Occlusion Detection ; Nitinol Alloy ; Heart Diseases ; Patent Ductus Arteriosus (PDA) ; Braiding ; Occluder

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