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A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
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Design and evaluation of prosthetic shoulder controller.

Joseph E Barton1, John D Sorkin

  • 1Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL; and Rehabilitation Institute of Chicago, Chicago, IL;

Journal of Rehabilitation Research and Development
|October 31, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel 2-degree-of-freedom shoulder transducer for advanced prosthetic arms. Transducers with resistance and position control schemes enhance prosthetic function for amputees.

Keywords:
Fitts’ lawamputationindex of difficultylinear mixed-effects modelposition controlprosthetic armprosthetic arm controlresistive feedbackshoulder range of motionvelocity control

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Engineering
  • Human-Machine Interfaces

Background:

  • Advanced prosthetic arms require intuitive control systems for users with shoulder disarticulation or high-level transhumeral amputation.
  • Existing control methods for powered prostheses often lack the dexterity needed for natural movement.
  • Development of novel sensing technologies is crucial for next-generation upper-limb prosthetics.

Purpose of the Study:

  • To develop and evaluate a 2-degree-of-freedom (DOF) shoulder position transducer for controlling powered prosthetic arms.
  • To assess the efficacy of different transducer designs (with and without resistance) and control schemes (position vs. velocity).
  • To establish a robust evaluation protocol using Fitts' law for prosthetic performance assessment.

Main Methods:

  • Development of a 2-DOF shoulder position transducer measuring protraction-retraction and elevation-depression.
  • Implementation of position and velocity control schemes for prosthetic humerus DOFs.
  • Design of an evaluation protocol based on Fitts' law to quantify task performance.

Main Results:

  • Transducers providing resistance to shoulder movement demonstrated superior performance compared to those without resistance.
  • A position control scheme, where prosthetic effector position is proportional to shoulder position, outperformed a velocity control scheme.
  • The developed transducer successfully controlled two DOFs of a powered prosthetic humerus.

Conclusions:

  • The 2-DOF shoulder position transducer offers a viable control solution for powered prosthetic arms, particularly for individuals with high-level amputations.
  • Resistance in the transducer and a position-based control strategy enhance prosthetic functionality and user performance.
  • The Fitts' law-based evaluation protocol provides a standardized method for assessing prosthetic device and control scheme performance.