User-centered Design and Evaluation of Physical Interfaces for an Exoskeleton for Paraplegic Users

Area of Science:

• Robotics
• Biomechanics
• Human-Computer Interaction

Background:

• Wearable lower limb exoskeletons offer mobility assistance for paraplegic individuals.
• Limited usability of the physical interface (pilot attachment system) hinders acceptance of robotic assistive technologies.
• User-centered design is crucial for optimizing the body-machine interface in assistive robotics.

Purpose of the Study:

• To propose and evaluate a novel pilot attachment system (PAS) for the VariLeg exoskeleton.
• To enhance the usability and comfort of the physical interface between exoskeleton and user.
• To assess the impact of user-centered design on the acceptance of lower limb exoskeletons.

Main Methods:

• A user-centered design approach was employed with experienced paraplegic exoskeleton users.
• A redesigned PAS was developed and compared to the initial version and a commercial exoskeleton's PAS.
• Subjective assessments included the System Usability Scale (SUS) and pain rating scales.

Main Results:

• The redesigned PAS demonstrated a 45% increase in SUS score compared to the initial PAS.
• Healthy pilots reported increased comfort with the redesigned PAS during activities of daily living.
• User evaluation and needs assessment led to significant usability improvements.

Conclusions:

• A user-centered design process positively influences the usability and acceptance of lower limb exoskeletons.
• Optimizing the physical body-machine interface is key to advancing robotic assistive technologies for paraplegic users.
• The redesigned PAS shows potential for improving daily living activities for individuals with mobility impairments.