ROBOImplant II: Development of a Noninvasive Controller/Actuator for Wireless Correction of Orthopedic Structural Deformities

Jonathan A. Liu, Mozziyar Etemadi, James A. Heller, Dillon Kwiat, Richard Fechter, Michael R. Harrison, Shuvo Roy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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 μm 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.

Original languageEnglish (US)
Article number031006
JournalJournal of Medical Devices, Transactions of the ASME
Volume6
Issue number3
DOIs
StatePublished - Aug 14 2012

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Biomedical Engineering

Fingerprint Dive into the research topics of 'ROBOImplant II: Development of a Noninvasive Controller/Actuator for Wireless Correction of Orthopedic Structural Deformities'. Together they form a unique fingerprint.

Cite this