'Hybrid-PLEMO', rehabilitation system for upper limbs with active / passive force feedback mode

Area of Science:

• Rehabilitation Robotics
• Biomechanics
• Human-Machine Interaction

Background:

• Existing upper limb rehabilitation robots often lack the necessary degrees of freedom (DOF) for natural arm movement.
• Human upper limbs operate in a 3-DOF space, necessitating rehabilitation systems that can accommodate this complexity.

Purpose of the Study:

• To develop a quasi 3-DOF upper limb rehabilitation system with adjustable inclination and force feedback.
• To introduce Hybrid-PLEMO, a versatile system capable of both active and passive rehabilitation modes.

Main Methods:

• Development of a quasi 3-DOF rehabilitation system with a 2-DOF force-feedback working plane.
• Implementation of an adjustable inclination mechanism for the working plane.
• Integration of ER (Erhysteresis) brakes or actuators for safety and a direct-drive linkage mechanism with sub links.

Main Results:

• The Hybrid-PLEMO system provides a compact, low-cost, and safe solution for upper limb rehabilitation.
• The system allows for adjustable working plane inclination, enhancing its adaptability.
• It features a hybrid active/passive mode and a direct-drive linkage mechanism for improved performance.

Conclusions:

• Hybrid-PLEMO represents an advancement in upper limb rehabilitation robotics by addressing the limitations of 2-DOF systems.
• The system's design facilitates training in a more natural 3-DOF space, crucial for stroke patients and the elderly.
• Further research into the mechanism and haptic control of Hybrid-PLEMO is warranted.