Journal of Research in Rehabilitation Sciences

Knee Joint Movement Control Using Hybrid Neuro-prosthesis Based on Persistent D-well Time Allocation Strategy with Muscle Fatigue Overcoming: Simulation Approach

Document Type : Original Articles

Authors

1 PhD Candidate, Department of Electrical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran

2 Associate Professor, Department of Electrical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran

3 Associate Professor, Scientific Core of Robotic Rehabilitation and Biofeedback, Mashhad Branch, Islamic Azad University, Mashhad, Iran

4 Professor, Department of Electrical Engineering, Mashhad Branch, Islamic Azad University AND Department of Electrical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

10.48305/jrrs.2023.39203.1001

Abstract

Introduction: Hybrid neuro-prostheses are used in rehabilitation of individuals with spinal cord injuries. These hybrid neuro-prostheses consist of a robot that moves the knee joint mechanically and a functional electrical stimulation (FES) part that moves the knee joint by electric current stimulation. The main challenge in the use of hybrid neuro-prostheses is muscle fatigue due to electrical stimulation. This study endeavored to reduce muscle fatigue through timing between robot and FES using Persistent D-well Time
Materials and Methods: A mathematical equation was used to model the knee movement in a hybrid neuro-prostheses. A differential equation was used to describe muscle fatigue. The simulation time was determined one hundred seconds and the goal of simulation was considered to regulate knee joint in angle of sixty degrees. Simulation time was divided into stages and a time interval was set for each stage. At each stage, FES was active for a certain time duration. After this duration until the end of the time frame of the stage, switch occurred between the FES and the robot, based on the muscle fatigue value.
Results: At the end of the simulation, the knee was regulated with a root mean square error of 0.79 degree at the reference angle. Using robots in the timing method reduced muscle fatigue and the muscle fatigue value was limited in a bounded range between 0.94 and 0.97.
Conclusion: The timing method simulated in this study can be effective for control of knee movement. Based on the results, it is expected that this method can be used in the control of hybrid neuro-prosthesis in practice during which the exercises prescribed by the therapist are rehearsed and the muscle fatigue increment need to be avoided in the client simultaneously.

Keywords

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Journal of Research in Rehabilitation Sciences
Volume 18, Issue 1
2022
Pages 12-23
  • Receive Date: 22 July 2022
  • Revise Date: 15 January 2023
  • Accept Date: 02 January 2023