Passive upper-body assistive device

Passive upper-body assistive device for lumbar traction and extension using multi-joint links and elastic elements

This technology is an upper-body assistive device that utilizes a multi-joint link structure and elastic elements positioned between frames secured to the user's upper and lower body. It passively provides traction to reduce disc pressure and generates a moment to assist in straightening the back through mechanical elastic deformation that occurs when the user bends forward.

Existing actuator-based active assistive devices face issues with battery and power supply, and can hinder movement or cause unintended muscle activation due to the application of excessive force.

This technology proposes a design where the upper frame, lower frame, and first and second connecting frames are sequentially connected to rotate, providing mechanical restorative force based on the user's movement through elastic elements, all without the need for an external power source. It is lightweight, maintenance-free, and easy to implement in fields involving repetitive lumbar strain, such as logistics, construction, and elderly care, effectively reducing the risk of injury.

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Key Features:

• Upper frame: Secured to the user's upper body, serving as the base to support the reaction force of the connecting frames and elastic elements.
• First and second connecting frames: Rotatably coupled to the upper frame and extending toward the lower body.
• Elastic elements: Provide the force required for lumbar traction and the moment needed to straighten the back.
• Lower frame: Supported by the lower body, providing the reaction force against the force and moment generated by the elastic elements.