Design and Validation of a High DOF Origami Inspired Soft Actuated Assistive Exoskeleton Arm and Spine

Abstract

This research presents the design, development, and validation of a high degree of freedom (DOF) exoskeleton actuated by origami-inspired soft inflatable modules. The objective was to create reliable soft actuators to provide safe and compliant movement assistance. Utilising lightweight 3D printing materials and origami-inspired soft flexible modules, the developed exoskeleton offers seven DOF to assist reaching motion of the upper limb. A passive rubber joint was incorporated for gravity compensation of the upper limb with elastic stability. The integrated exoskeleton consists of collapsible soft actuators made from polyethylene tubing, an ultra-lightweight structure with seven DOF, and real-Time feedback through electronic goniometers. The validation included comprehensive testing of the soft actuators, and evaluating speed and accuracy. Torque measurements of the single module reached up to 4.46 Nm. A participant experiment in reaching motion demonstrated relatively slow but accurate movement, showcasing the effectiveness in assisting passive motion. This research successfully integrates soft actuators with a high DOF exoskeleton, highlighting its potential for providing movement assistance in various applications in the future.