A novel passive lumbar exoskeleton that provides multiple traction forces

A novel wearable passive exoskeleton mechanism is proposed and a prototype model is designed to address the problem of excessive spinal compression force that can easily result from the daily work activities of workers that require stooping. The exoskeleton utilizes the principle of leverage to provide two traction forces to reduce spinal compression force. Theoretical models of kinematics and statics were done and finite element simulation was utilized to depict the trend of the two traction forces provided by the exoskeleton. The biomechanical model of the human body was done to show the change of spinal compression force and joint torque under the double traction forces, and the results showed that there is a good reduction of spinal compression force and joint torque, and the exoskeleton has a spinal protection performance, which provides a novel idea for the future design of lumbar exoskeletons oriented to spinal protection.