Supinator Extender (SUE): a pneumatically actuated robot for forearm/wrist rehabilitation after stroke

Area of Science:

• Robotics
• Rehabilitation Engineering
• Biomechanics

Background:

• Exoskeleton robots are increasingly used in physical rehabilitation.
• Forearm and wrist movements are crucial for upper limb function.
• Stroke survivors often experience impaired forearm/wrist mobility and passive tone.

Purpose of the Study:

• To introduce the Supinator Extender (SUE), a novel robotic module for forearm and wrist rehabilitation.
• To integrate SUE with existing exoskeleton systems like UCI BONES and ArmeoSpring.
• To evaluate SUE's capability in measuring and mitigating passive tone to improve range of motion.

Main Methods:

• Designed SUE as a 2-DOF serial chain utilizing lightweight pneumatic actuators.
• Integrated SUE with UCI BONES and ArmeoSpring rehabilitation devices.
• Tested SUE's ability to measure and cancel forearm/wrist passive tone in subjects.

Main Results:

• SUE provides 90 degrees of motion for both supination-pronation and wrist flexion-extension.
• Pneumatic actuators offer a high power-to-weight ratio, enabling necessary rehabilitation forces.
• Demonstrated SUE's effectiveness in measuring and canceling passive tone, thereby increasing active range of motion.

Conclusions:

• The Supinator Extender (SUE) robot effectively adds forearm/wrist rehabilitation capabilities to exoskeleton systems.
• SUE's design facilitates safe and effective therapy by maximizing workspace and minimizing collision risk.
• This robotic module shows promise for improving functional recovery in stroke patients with forearm/wrist impairments.