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Optimal Design of an External Fixator for Knee Injuries & Deformities

Godazandeh, Bardia | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47506 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Zohoor, Hassan
  7. Abstract:
  8. Since ancient time, healing patients suffering from bone deformities has been one of the most important challenges of physicians. In recent decades, by helping bio mechanic engineers external fixators has been used for this purpose. These fixators divided to parallel and series forms. One of the remarkable merit of parallel external fixators is their high maneuverability. These fixators usually have six degree of freedom, and follow the movement’s pattern of Stewart robots. In this project by studying different fixators which has been commercials, we present two conceptual models of these fixators which three and four legs are used for connecting the lower and upper plates, respectively. The lower plate is fixed to the tibia bone and upper plates possess six degree of freedom to free translational and rotational movement. The main purpose of this project is boasting the fixator’s performance during healing process. Since we have applied four legs for connecting the lower and upper plates in the four legs mechanism, the fixator will change to redundant mechanism. This issue can prevent the mechanism from positioning in singular points during the free movement of the upper plate
  9. Keywords:
  10. Parallel Mechanism ; Series-Parallel System ; Stewart Platform ; Singularity Point ; Bone Deformity ; External Fixator

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