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Design, Simulation, Prototyping and Analysis of a Lengthening Femoral Implant

Mahdavifar, Mohsen | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56464 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farahmand, Farzam; Durali, Mohammad
  7. Abstract:
  8. Motorized intramedullary nails are a viable solution to treat patients with limb-length inequality. These fully implanted devices use external magnetic actuation to extend. This research examines the conceptual design of this type of nails by investigating various ideas and previous designs. The implant mechanism, body and controller are designed in detail. It was then simulated in standard tests to evaluate it. In addition, the implanted nail undergoes a biomechanical analysis and its stiffness is assessed. Finally, the controller design is carried out using dipole magnetic theory and verified by finite element simulations. As a proof of concept, we made a prototype that is twice the size of the original design due to market shortcomings and tested it under axial compressive loading. The current research involves presenting a new implant design and evaluating its stiffness using a new method. The comparison of theoretical calculations and finite element simulations with experimental investigation of magnetic torque transmission has not been done in previous studies. Although the prototype confirmed the design functionality, the quality of the system did not meet the target due to the use of prefabricated components. This problem can be easily resolved by manufacturing new power transmission parts in the next prototype
  9. Keywords:
  10. Bone Implant ; Intramedullary Nailing ; Implant Modeling ; Controlled Intramedullary Nail ; Orthopedic Implant ; Femur

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