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Special Section Technical Briefs

Feedback Control for Patient Specific Limb Lengthening and Limb Deformity Correction1

[+] Author and Article Information
Janine Guenther, Daniel Farley, Heidi-Lynn Ploeg, Michael Zinn

Department of Mechanical Engineering,
University of Wisconsin–Madison,
Madison, WI 53706

Accepted and presented at The Design of Medical Devices Conference (DMD2015), April 13–16, 2015, Minneapolis, MN, USA.

Manuscript received March 3, 2015; final manuscript received May 7, 2015; published online July 16, 2015. Editor: Arthur Erdman.

J. Med. Devices 9(3), 030904 (Sep 01, 2015) (2 pages) Paper No: MED-15-1059; doi: 10.1115/1.4030595 History: Received March 03, 2015; Revised May 07, 2015; Online July 16, 2015

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Figures

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Fig. 1

System model of implantable device attached to SLS tissue model showing stepper motor rotor inertia (Im), device mass (md), and displacement ratio (N). The motor produces torque (τm), which results in device displacement (xd) and force feedback (fc).

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Fig. 2

Position and force responses for sudden changes in tissue stiffness. At time 1, the system becomes 50% more stiff, at time 2 the system become 50% more pliant, and at time 3, the system become 70% more pliant.

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Fig. 3

Improved control approach in which force is monitored to detect complications during lengthening and the trajectory of the position command is adjusted to compensate for changes in system stiffness. As the device is motor driven, a continuous position command can be supplied to avoid high peak forces associated with position steps.

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