Variable Admittance Control of a Hand Exoskeleton for Virtual Reality-Based Rehabilitation Tasks

Area of Science:

• Robotics
• Rehabilitation Engineering
• Virtual Reality

Background:

• Robot-based rehabilitation improves functional recovery and patient engagement.
• Hand exoskeletons offer a promising tool for repetitive object manipulation tasks.
• Virtual reality enhances rehabilitation by simulating tasks and providing reward-based systems.

Purpose of the Study:

• To design and describe a Hand Exoskeleton System (HES) for virtual reality-based rehabilitation.
• To investigate a variable admittance control strategy for realistic force feedback.
• To enhance patient participation and therapy outcomes in hand rehabilitation.

Main Methods:

• Developed a Hand Exoskeleton System (HES) interfaced with variable admittance control.
• Created a virtual reality environment using the Webots framework with a HES digital-twin.
• Implemented a control strategy that adapts parameters for force sensation and user motion intention.

Main Results:

• The HES successfully provided force feedback during virtual object interaction.
• The variable admittance control strategy adapted to user intentions.
• A pilot study demonstrated the feasibility of the VR-based rehabilitation approach.

Conclusions:

• The integrated HES and VR system shows potential for engaging and effective hand rehabilitation.
• Variable admittance control is crucial for rendering realistic force feedback in robotic rehabilitation.
• Further studies are warranted to validate the system's efficacy in larger patient cohorts.