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Related Experiment Videos

Rail supporting transducer posts for three-dimensional force measurement

Z Jin1, R Kobetic

  • 1Case Western Reserve University, Cleveland, OH 44106, USA.

IEEE Transactions on Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|January 9, 1998
PubMed
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Researchers developed instrumented parallel bars to measure 3-D forces in paraplegic patients using functional electrical stimulation (FES) for stair mobility. The system accurately measured forces during stair climbing and descent, addressing key technical challenges.

Area of Science:

  • Biomechanics
  • Rehabilitation Engineering
  • Assistive Technology

Background:

  • Functional electrical stimulation (FES) offers potential for restoring mobility in individuals with spinal cord injuries.
  • Accurate measurement of ground reaction forces is crucial for developing and evaluating FES-controlled movement patterns.
  • Existing measurement systems may face challenges with accuracy and crosstalk in complex movements like stair negotiation.

Purpose of the Study:

  • To design, instrument, and calibrate parallel bars for measuring three-dimensional (3-D) forces applied by paraplegic patients.
  • To adapt and evaluate the system specifically for measuring support forces during stair climbing and descent using FES.
  • To investigate and mitigate issues of crosstalk, nonlinearity, and hysteresis in the force measurement system.

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Main Methods:

  • Instrumented parallel bars were designed with transducer posts to capture 3-D forces.
  • The system was calibrated to ensure accuracy and minimize measurement errors.
  • Specific tests were conducted to assess crosstalk between measurement axes, nonlinearity, and hysteresis during simulated FES-assisted stair negotiation.

Main Results:

  • The instrumented parallel bars successfully measured 3-D forces applied by paraplegic patients.
  • Crosstalk between the three measurement axes was reduced to less than 5%.
  • Nonlinearity was found to be less than 2% of full scale, and overall force accuracy was better than 5%.

Conclusions:

  • The developed instrumented parallel bars provide a reliable method for measuring 3-D forces during FES-assisted stair mobility in paraplegic individuals.
  • The system's performance, with low crosstalk and nonlinearity, supports its use in evaluating FES control strategies for complex functional movements.
  • This technology aids in the advancement of rehabilitation engineering for spinal cord injury patients, enhancing the development of effective FES applications.