An implantable actuator and its accompanying driver circuit are presented for the purpose of lengthening bones and correcting skeletal deformities without requiring physical contact between the operator and the implanted device. This system utilizes magnetic coupling to form a magnetic gear, allowing an external motor to drive an implantable telescoping rod. The accompanying electronics are able to monitor the progress, in the form of turns delivered, as well as detect procedural errors, such as magnet decoupling. The force applied by the implanted telescoping rod can be accurately measured by monitoring the current necessary for the external controller to drive the extension of the implanted rod. After characterization, the system was shown to reliably deliver extension distances within 34 and maintain coupling out to 70 mm. The system is also able to measure torques as low as 0.12 mN m. System variability and accuracy of external monitoring are addressed.
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September 2012
Research Papers
ROBOImplant II: Development of a Noninvasive Controller/Actuator for Wireless Correction of Orthopedic Structural Deformities
Jonathan A. Liu,
Jonathan A. Liu
Engineer
UCB/UCSF Joint Graduate Group in Bioengineering
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Mozziyar Etemadi,
Mozziyar Etemadi
MD/PhD Candidate
UCB/UCSF Joint Graduate Group in Bioengineering
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James A. Heller,
James A. Heller
Engineer
Department of Bioengineering, and Therapeutic Sciences,
University of California
, San Francisco, CA 94158
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Dillon Kwiat,
Dillon Kwiat
Engineer
Department of Pediatric Surgery,
University of California
, San Francisco, CA 94143
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Richard Fechter,
Richard Fechter
Clinical Engineer
Department of Surgery,
University of California
, San Francisco, CA 94143
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Michael R. Harrison,
Michael R. Harrison
Professor
Emeritus of Surgery, Pediatrics Obstetrics, Gynecology and Reproductive Sciences, Director Emeritus, Fetal Treatment Center, Division of Pediatric Surgery, Department of Surgery, University of California
, San Francisco, CA 94143
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Shuvo Roy
Shuvo Roy
Associate Professor of Bioengineering and Therapeutic Sciences, Biomedical Medical Devices Laboratory, Department of Bioengineering and Therapeutic Sciences,
shuvo.roy@ucsf.edu
University of California
, San Francisco, CA 94158
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Jonathan A. Liu
Engineer
UCB/UCSF Joint Graduate Group in Bioengineering
Mozziyar Etemadi
MD/PhD Candidate
UCB/UCSF Joint Graduate Group in Bioengineering
James A. Heller
Engineer
Department of Bioengineering, and Therapeutic Sciences,
University of California
, San Francisco, CA 94158
Dillon Kwiat
Engineer
Department of Pediatric Surgery,
University of California
, San Francisco, CA 94143
Richard Fechter
Clinical Engineer
Department of Surgery,
University of California
, San Francisco, CA 94143
Michael R. Harrison
Professor
Emeritus of Surgery, Pediatrics Obstetrics, Gynecology and Reproductive Sciences, Director Emeritus, Fetal Treatment Center, Division of Pediatric Surgery, Department of Surgery, University of California
, San Francisco, CA 94143
Shuvo Roy
Associate Professor of Bioengineering and Therapeutic Sciences, Biomedical Medical Devices Laboratory, Department of Bioengineering and Therapeutic Sciences,
University of California
, San Francisco, CA 94158shuvo.roy@ucsf.edu
J. Med. Devices. Sep 2012, 6(3): 031006 (5 pages)
Published Online: August 14, 2012
Article history
Received:
January 31, 2012
Revised:
July 14, 2012
Online:
August 14, 2012
Published:
August 14, 2012
Citation
Liu, J. A., Etemadi, M., Heller, J. A., Kwiat, D., Fechter, R., Harrison, M. R., and Roy, S. (August 14, 2012). "ROBOImplant II: Development of a Noninvasive Controller/Actuator for Wireless Correction of Orthopedic Structural Deformities." ASME. J. Med. Devices. September 2012; 6(3): 031006. https://doi.org/10.1115/1.4007183
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