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Design and Feasibility Testing of a Novel Device for Automatic Distraction Osteogenesis of the Mandible

[+] Author Affiliations
Nathan B. Crane, J. Michael Gray, Sarah E. Mendelowitz, Jason W. Wheeler, Alexander H. Slocum

Massachusetts Institute of Technology, Cambridge, MA

Paper No. DETC2004-57232, pp. 611-620; 10 pages
doi:10.1115/DETC2004-57232
From:
  • ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 2: 28th Biennial Mechanisms and Robotics Conference, Parts A and B
  • Salt Lake City, Utah, USA, September 28–October 2, 2004
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4695-4 | eISBN: 0-7918-3742-4
  • Copyright © 2004 by ASME

abstract

Mandibular distraction osteogenesis is a medical procedure for lengthening the mandible bone by stimulating natural bone-healing mechanisms via a mechanical device that exerts a force on the mandible in one or more directions. Many mandibular distraction devices must be placed externally and most rely on the patient to manually actuate the device each day. This project focuses on the design of an automatically actuated, single degree-of-freedom, implantable distraction device that would be minimally visible after installation. Such a device could reduce errors from patient compliance and would be an important first step toward increasing the capability of future devices. A simple motor and leadscrew system was used with a custom designed impact transmission and controller. A test was conducted on a prototype to determine the feasibility of the design and measure the overall system efficiency. The device was able to move the required 70 N load at a rate of about 1 mm per minute. Compared to an equivalent device utilizing a planetary gearhead to amplify the torque, the impact coupling is significantly less efficient. However, the necessary increase in battery size has only a small impact on the total device length. For a system with the same motor and force output, the impact coupling system is shorter than the gearhead-based system due to a 50% reduction in transmission length.

Copyright © 2004 by ASME
Topics: Design , Testing

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