Preliminary evaluation of a passive upper-limb exoskeleton based on a new spring design

Area of Science:

• Biomechanics
• Ergonomics
• Musculoskeletal health

Background:

• Musculoskeletal disorders (MSDs) pose risks in occupational settings.
• Upper limb exoskeletons offer potential solutions for reducing physical strain.
• Variations in exoskeleton design necessitate specific evaluations.

Purpose of the Study:

• To evaluate a novel passive upper limb exoskeleton.
• To assess the exoskeleton's efficacy using a new composite spring rod design.
• To measure the impact on muscular demand during key manual tasks.

Main Methods:

• Twelve participants performed static overhead holding, manual handling, and load carrying tasks.
• Electromyography (EMG) activity of the anterior deltoid and biceps brachii was recorded.
• Data was collected both with and without the upper limb exoskeleton.

Main Results:

• Significant reductions in EMG activity were observed for the anterior deltoid and biceps brachii.
• The exoskeleton effectively decreased shoulder-flexor muscular demand across all tested tasks.
• These findings indicate reduced physical exertion when wearing the device.

Conclusions:

• The passive upper limb exoskeleton with composite spring rods can reduce muscular demand.
• The device shows potential for mitigating MSD risk in occupational settings.
• Further in-field studies are recommended to confirm long-term efficacy and worker benefits.