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fMRI-compatible rehabilitation hand device.

Azadeh Khanicheh1, Andrew Muto, Christina Triantafyllou

  • 1Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, USA. azadeh@coe.neu.edu

Journal of Neuroengineering and Rehabilitation
|October 7, 2006
PubMed
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This study introduces MR_CHIROD, a novel Magnetic Resonance Compatible Smart Hand Interfaced Rehabilitation Device. It uses Electro-Rheological Fluids for controlled handgrip rehabilitation during fMRI, demonstrating MR compatibility and effective force resistance.

Area of Science:

  • Biomedical Engineering
  • Neurorehabilitation Technology
  • Medical Imaging Devices

Background:

  • Functional magnetic resonance imaging (fMRI) requires precise interfaces for controlled human movement studies and neurorehabilitation.
  • Developing MR-compatible robotic devices is crucial for quantifying and improving physical rehabilitation.
  • Standard mechanical parts are incompatible with MR environments, posing a challenge for device development.

Purpose of the Study:

  • To design, fabricate, and test a novel, MR-compatible, computer-controlled hand device for handgrip rehabilitation during brain fMRI.
  • To introduce a new method for tunable and controllable resistive force generation using Electro-Rheological Fluids (ERFs).
  • To enable precise measurement of patient-induced motion and force during rehabilitation exercises.

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Main Methods:

  • Developed a one-degree-of-freedom MR-compatible hand device named MR_CHIROD.
  • Integrated an Electro-Rheological Fluid (ERF) based resistive element for variable force control.
  • Incorporated an optical encoder and a force sensor for real-time motion and force measurement.

Main Results:

  • The MR_CHIROD device successfully resisted up to approximately 50% of maximum human handgrip force.
  • Compatibility tests confirmed no adverse effects of the MR environment on ERF properties or sensor performance.
  • No significant degradation of MR images was observed with the MR_CHIROD in the scanner.

Conclusions:

  • The developed MR-compatible hand device facilitates brain function studies during controlled handgrip exercises.
  • The system's MR compatibility and effective force control were demonstrated.
  • This represents the first known system to utilize ERF technology within an MR environment for rehabilitation.