Loading...

Analysis, Design and Manufacturing of Custom Osteotomy Implants Forming Machine

Gomari, Behnam | 2016

692 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49127 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farahmand, Farzam; Farkhondeh, Hassan
  7. Abstract:
  8. Knee arthritis is a painful disease from which millions of people around the world are suffering. One of the main causes of osteoarthritis and joint damage that starts from a young age, is that bones around the knee are not in a straight line. As a result, this situation causes additional pressure to the knee. This should be corrected with surgery. There are two procedures for this operation, a conventional method and a customized method. In conventional method, surgical planning is based on 2d X-ray images and plates are formed and fixed approximately at the desired location. This method is not precise enough and may cause problems for the patient. A new developing method, is that all the components and processes are patient specific. This method has some disadvantages, including its high price compared to that of conventional method. Major additional costs are related to the build-up of plates by Additive Manufacturing methods. Despite the importance of this issue, a practical approach is not provided to build custom plates. The aim of this study is to analyze, design and manufacture custom osteotomy implants forming machine. Limitations of proposed methods for making plates were determined and were compared with the limitations of designation. Next, multi point forming method was selected. Then, die components and the whole system were designed and the components of the system were manufactured and machine parts were assembled together. Finally, a two-dimensional anatomic form was chosen as the desired shape that plates were formed to that shape. Due to spring-back phenomenon, it was necessary to modify die form, which was performed with the finite element method. Then, system was tested with the corrected form. After measurement, some differences between finite element results and empirical testing were observed. This error was result of the calculation of finite element analysis. To clarify, this error was caused by the finite element approximation, the effects of inertia on dynamic explicit analysis and approximation of material properties and assumption of fluid incompressibility. Some of these errors can be corrected to revise the results. Finally, it is asserted that this method can be used in forming patient specific plates
  9. Keywords:
  10. Metals Forming ; Finite Element Method ; Spring Back ; Patient-Specific Modeling ; Arthritis ; Osteotomy Surgery ; Multi-Point Forming Method

 Digital Object List

 Bookmark

No TOC