- Senior Design Spring 2004
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Stevens Institute of Technology
- Mechanical and Biomedical Engineering Departments
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Final Design and Design InterfaceIn terms how the device will interface with a patient’s mouth, the lower transport plates would be attached to the healthy portions of the patient’s alveolar bone and tissue. The transport plates allow for insertion of a specialized angled connecting wedge which will hold the threaded rod and the lower transport plates together. The threaded rod acts as a transport vector for the bone distraction in a patient specified direction. The thread contains a pitch of .5 mm, allowing for the user to turn the nut one complete turn twice a day in order to shift the upper transport plate (which connects to the osteotomy) 1 mm total a day in the specified direction. The whole device is stabilized by the lower transport plates and surrounding soft tissue of the alveolar region in the patient, disallowing any separation of the device while in situ. See exploded view below.
Angular Adjustment
Engineering AnalysisStresses Experienced During Distraction:
Stress Distribution on Assembly:
Material SelectionMaterial selection is an important consideration for the device. Because titanium and/or stainless steel would not detrimentally affect the region of surgical intervention, these were the only material options analyzed. After running finite element analysis on the assembly and comparing the stress and factor of safety distribution of both materials, titanium was found to perform better than stainless steel, as shown in the following figures. However, practicality of manufacturing purposes dictates the material selection to ultimately be of surgical grade stainless steel.
Device Composed of Steel -Factor of Safety Distribution
Device Composed of Titanium -Factor of Safety Distribution
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