An investigation of the performance of NiTi shape memory alloy based bone fixation device
This project has involved design of a new bone fixation device made of NiTi shape memory alloy. Conceptual designs were generated by using Product Design Specification (PDS) and brainstorming methods. The concept evaluation of the conceptual designs has been carried out by means of weighted ob...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/67809/1/fk%202015%20108%20ir.pdf |
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| Summary: | This project has involved design of a new bone fixation device made of NiTi shape
memory alloy. Conceptual designs were generated by using Product Design
Specification (PDS) and brainstorming methods. The concept evaluation of the
conceptual designs has been carried out by means of weighted objective method and the
conceptual design that scores highest was chosen as the best design concept. The
concept of Nitinol Stitch was the most suitable for bone fixation device because of large
size of fracture coverage and excellent adaptability to bone geometry when compared to
other design concepts.
The new bone fixation device model was fabricated by using NiTi shape memory alloy
as its main constituent. Performance of the newly designed bone fixation device model
made of NiTi shape memory alloy was evaluated. Meanwhile, commercial finite
element analysis (FEA) software, Abaqus was used to analyze the mechanics of model as
well as its behavior, so that the installation process during orthopedic surgery can be
simulated. A prototype has been fabricated. Heat test was conducted in laboratory to
investigate the actual performance of the prototype. Experimental data were compared to
the simulation data for result validation.
From simulation, it is found that the gap between two bone fragments has been reduced
from 2mm to 0.2mm. However, slipping occurred during experiment, the gap has
increased up to 6.54mm. The simulation result was further explored to justify the
device’s feasibility. The findings of this research will provide one of the possibilities
that can be made to solve shortcomings of a few existing SMA based bone fixation
devices as reviewed in literature. The research has led to a conclusion that the newly
designed device, Nitinol Stitch, has shown its potential advantages in orthopedics by
offering a new alternative in fixing bone fracture. The design and experimental processes
throughout the project can be used as a reference for future development of other SMA
based bone fixation devices. |
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