Taking an exoskeleton from ‘ready, set’ to go

March 5, 2021
Animation of an exoskeleton moving from sitting to standing.
A virtual model of the Wandercraft Atlante exoskeleton moving from sitting to standing position. Courtesy paper.

An exoskeleton user can now go from sitting to standing safely and without assistance based on the work of University of Michigan researchers, who developed a new approach to create and test solutions to such problems virtually.

“We now have a way to systematically design control objectives for highly constrained systems such that the objectives are not in conflict with the contact constraints,” said Eva Mungai, a PhD candidate in Mechanical Engineering. 

The paper, “Feedback Control Design for Robust Comfortable Sit-to-Stand Motions of 3D Lower-Limb Exoskeletons,” is published in IEEE Access.

Similar research on the sit-to-stand activity is often done with a simplified model due to the complexity that three dimensions introduces. That work focuses on the sagittal plane, the X-axis of the sit-to-stand problem, while Mungai’s work incorporates sagittal, frontal, and transverse planes, or X, Y, and Z-axes.

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A more comfortable robotic prosthetic leg

July 15, 2020

A new robotic prosthetic leg prototype offers a more natural gait while also being quieter and more energy efficient than other designs. 

The key is the use of new small and powerful motors, originally designed for a robotic arm on the International Space Station. The streamlined design offers a free-swinging knee and regenerative braking, which charges the battery with energy captured when the foot hits the ground. This feature enables the leg to more than double a typical prosthetic user’s walking needs with one charge per day.

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Open-source bionic leg: First-of-its-kind platform aims to rapidly advance prosthetics

June 5, 2019

A new open-source, artificially intelligent prosthetic leg designed by researchers at the University of Michigan and Shirley Ryan AbilityLab is now available to the scientific community.

The leg’s free-to-copy design and programming are intended to improve the quality of life of patients and accelerate scientific advances by offering a unified platform to fragmented research efforts across the field of bionics.

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