A soft, synergy-based robotic glove for grasping assistance

Area of Science:

• Robotics
• Rehabilitation Engineering
• Biomedical Engineering

Background:

• Spinal cord injury (SCI) often impairs hand function, limiting independence.
• Existing assistive devices can be cumbersome or lack versatility.
• Restoring grasp capability is crucial for activities of daily living (ADLs).

Purpose of the Study:

• To introduce a novel soft, tendon-driven robotic glove for grasp augmentation.
• To provide rehabilitation assistance for individuals with post-SCI.
• To evaluate the glove's effectiveness in improving hand function.

Main Methods:

• The glove utilizes an underactuation design and postural synergies for versatile grasping with a single actuator.
• Device efficiency and force output linearity were characterized for cylindrical and pinch grasps.
• A preliminary case study involved a participant with C7 incomplete SCI performing the Box and Block test.

Main Results:

• The lightweight and easy-to-don glove generated sufficient force for ADLs.
• Force output was linear in both cylindrical and pinch grasp configurations.
• The synergy-inspired actuation minimally altered natural force distribution across fingers.
• The participant demonstrated a 50% improvement in the Box and Block test (6 vs. 4 blocks).

Conclusions:

• The soft robotic glove effectively augments grasp capability and aids SCI rehabilitation.
• The underactuation and synergy-based design offers a promising approach for assistive devices.
• The glove shows potential for improving functional performance in SCI patients.