Distraction osteogenesis is a routine surgical procedure to lengthen a long bone. A fixed lengthening rate is typically used. We investigate measuring forces continuously and producing a variable distraction rate. A motorized distractor was instrumented with a load cell to measure the forces developed in a limb during distraction osteogenesis. The motor moves 2.6 μm at each step, with a variable frequency depending on the distraction rate. The forces were measured every 15 s and used to change the rate on the autodistractor. The autodistractor, load cell, data logger, controller, and battery pack were all mounted on a monolateral rail fixator, which was tested on a sheep that underwent tibial lengthening. Results show the feasibility of continually recording forces in vivo. The lengthening rate changed automatically, based around a threshold force of 300 N. Findings indicate that force readings are feasible and practical with a simple device. Force determination may provide an additional means to evaluate tissue integrity in real-time and away from the clinic. An automatic variable rate device could improve limb lengthening.
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December 2011
Research Papers
Development of a Force-Driven Distractor for Distraction Osteogenesis
Jinyong Wee,
Jinyong Wee
School of Biomedical Engineering,
Drexel University
, Philadelphia, PA 19104
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Robert E. Akins,
Robert E. Akins
Alfred I. duPont Hospital for Children
, 1600 Rockland Road, Wilmington, DE 19803
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William G. Mackenzie,
William G. Mackenzie
Alfred I. duPont Hospital for Children
, 1600 Rockland Road, Wilmington, DE 19803
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Rahamim Seliktar,
Rahamim Seliktar
School of Biomedical Engineering,
Drexel University
, Philadelphia, PA 19104
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David G. Levine,
David G. Levine
Widener Hospital,
The University of Pennsylvania School of Veterinary Medicine
, 382 West Street Road, Kennett Square, PA 19348
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Dean W. Richardson,
Dean W. Richardson
Widener Hospital,
The University of Pennsylvania School of Veterinary Medicine
, 382 West Street Road, Kennett Square, PA 19348
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George R. Dodge,
George R. Dodge
Department of Orthopaedic Surgery,
University of Pennsylvania
, 424 G Stemmler Hall, 36th Street and Hamilton Walk, Philadelphia, PA 19104-6081
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Tariq Rahman
e-mail: trahman@nemours.org
Tariq Rahman
Alfred I. duPont Hospital for Children
, 1600 Rockland Road, Wilmington, DE 19803
Search for other works by this author on:
Jinyong Wee
School of Biomedical Engineering,
Drexel University
, Philadelphia, PA 19104
Robert E. Akins
Alfred I. duPont Hospital for Children
, 1600 Rockland Road, Wilmington, DE 19803
William G. Mackenzie
Alfred I. duPont Hospital for Children
, 1600 Rockland Road, Wilmington, DE 19803
Rahamim Seliktar
School of Biomedical Engineering,
Drexel University
, Philadelphia, PA 19104
David G. Levine
Widener Hospital,
The University of Pennsylvania School of Veterinary Medicine
, 382 West Street Road, Kennett Square, PA 19348
Dean W. Richardson
Widener Hospital,
The University of Pennsylvania School of Veterinary Medicine
, 382 West Street Road, Kennett Square, PA 19348
George R. Dodge
Department of Orthopaedic Surgery,
University of Pennsylvania
, 424 G Stemmler Hall, 36th Street and Hamilton Walk, Philadelphia, PA 19104-6081
Tariq Rahman
Alfred I. duPont Hospital for Children
, 1600 Rockland Road, Wilmington, DE 19803e-mail: trahman@nemours.org
J. Med. Devices. Dec 2011, 5(4): 041004 (5 pages)
Published Online: November 14, 2011
Article history
Received:
April 6, 2011
Revised:
October 4, 2011
Published:
November 14, 2011
Citation
Wee, J., Akins, R. E., Mackenzie, W. G., Seliktar, R., Levine, D. G., Richardson, D. W., Dodge, G. R., and Rahman, T. (November 14, 2011). "Development of a Force-Driven Distractor for Distraction Osteogenesis." ASME. J. Med. Devices. December 2011; 5(4): 041004. https://doi.org/10.1115/1.4005321
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