Design Innovation

An Implantable Battery System for a Continuous Automatic Distraction Device for Mandibular Distraction Osteogenesis

[+] Author and Article Information
M. D. Chung

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125mdchung@umich.edu

R. D. Rivera, S. E. Feinberg

Department of Oral and Maxiallofacial Surgery, University of Michigan, Ann Arbor, MI 48109-2125

A. M. Sastry

Department of Mechanical Engineering, Department of Biomedical Engineering, and Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2125

J. Med. Devices 4(4), 045005 (Dec 06, 2010) (6 pages) doi:10.1115/1.4003007 History: Received May 07, 2010; Revised October 24, 2010; Published December 06, 2010; Online December 06, 2010

Distraction osteogenesis is a method of generating new bone formation by the gradual application of tensile stress across an osteotomy site (a complete cut through the bone). Internal or intraoral distraction devices have become the most common clinical apparatus in craniofacial distraction osteogenesis, although actuating the distraction devices relies upon manual length adjustment under patients’ compliance, introducing inconvenience and potential error in the procedure. To realize a fully implantable automatic distraction device, we propose a device design comprising a continuous miniature motor-driven distractor with a controller and an on-board lithium-ion battery. A benchtop prototype was fabricated to demonstrate the device’s structural design capable of transmitting sufficient loads with sufficient strain accuracy; it is capable of using a battery selection algorithm to determine an appropriate electrochemistry, temperature, sealability, and form factor and a control algorithm and a testing protocol with a laboratory-fabricated control circuit. This new distraction osteogenesis device enables completely automated and continuous distraction by the application of a low strain magnitude with multiple steps potentially leading to enhanced osteogenic activity.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Structural design using SolidWorks® 2006 with transparent view

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Figure 2

Schematic diagram for control circuit

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Figure 3

Pulsed current and voltage profile of the selected UBC322030 battery for 15 days distraction process. The required pulse current was 60 mA for 100 ms every 2.5 min with a continuous current drain of 150 μA.

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Figure 4

Prototype device design and fabrication: (a) computer-aided design and (b) prototype device on a mandible model




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