Cross-wire assist suit concept, for mobile and lightweight multiple degree of freedom hip assistance

In this paper, we present our cross-wire assist concept, for assisting a single joint in multiple degrees of freedom. It is comprised of four motor driven Bowden cable actuators (wires) per assisted joint, with the wires crossed over each other at the front and rear. Simulation results show that selectively actuating a subset of these wires allows torque to be generated in 6 directions, with the torque magnitude dependent on joint angle. We have built a fully wearable prototype of our assistance device for both hip joints, with 8 high-speed and independently controllable actuators each providing force up to 100 N. The prototype has a total mass of 9.3 kg, and is shown in motion capture testing to generate movement in 6 directions around the users joint, including internal and external rotation. Mobile, multi-degree of freedom assistance cross-wire system will enable assistive devices to better match human movement, allowing support and rehabilitation in tasks beyond straight line walking.

[1]  C. Walsh,et al.  Biomechanical and Physiological Evaluation of Multi-Joint Assistance With Soft Exosuits , 2017, IEEE Transactions on Neural Systems and Rehabilitation Engineering.

[2]  Gregory S. Sawicki,et al.  Reducing the energy cost of human walking using an unpowered exoskeleton , 2015, Nature.

[3]  Jianda Han,et al.  Continuous Estimation of Human Multi-Joint Angles From sEMG Using a State-Space Model. , 2017, IEEE transactions on neural systems and rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society.

[4]  Herman van der Kooij,et al.  XPED2: A Passive Exoskeleton with Artificial Tendons , 2014, IEEE Robotics Autom. Mag..

[5]  Jerry E. Pratt,et al.  Development of the IHMC Mobility Assist Exoskeleton , 2009, 2009 IEEE International Conference on Robotics and Automation.

[6]  S. Delp,et al.  Predicting the metabolic cost of incline walking from muscle activity and walking mechanics. , 2012, Journal of biomechanics.

[7]  Rachel W Jackson,et al.  An experimental comparison of the relative benefits of work and torque assistance in ankle exoskeletons. , 2015, Journal of applied physiology.

[8]  H. van der Kooij,et al.  Design of a series elastic- and Bowden cable-based actuation system for use as torque-actuator in exoskeleton-type training , 2005, 9th International Conference on Rehabilitation Robotics, 2005. ICORR 2005..

[9]  Conor J. Walsh,et al.  Soft exosuit for hip assistance , 2015, Robotics Auton. Syst..

[10]  D. De Clercq,et al.  A Simple Exoskeleton That Assists Plantarflexion Can Reduce the Metabolic Cost of Human Walking , 2013, PloS one.

[11]  P. Schwenkreis,et al.  Voluntary driven exoskeleton as a new tool for rehabilitation in chronic spinal cord injury: a pilot study. , 2014, The spine journal : official journal of the North American Spine Society.

[12]  Antonie J. van den Bogert,et al.  Exotendons for assistance of human locomotion , 2003 .

[13]  Conor J. Walsh,et al.  A biologically inspired soft exosuit for walking assistance , 2015, Int. J. Robotics Res..

[14]  Hugh M Herr,et al.  Autonomous exoskeleton reduces metabolic cost of human walking during load carriage , 2014, Journal of NeuroEngineering and Rehabilitation.

[15]  Adam Zoss,et al.  On the Biomimetic Design of the Berkeley Lower Extremity Exoskeleton (BLEEX) , 2005, Proceedings of the 2005 IEEE International Conference on Robotics and Automation.

[16]  Yuehong Yin,et al.  Mechanism design and motion control of a parallel ankle joint for rehabilitation robotic exoskeleton , 2009, 2009 IEEE International Conference on Robotics and Biomimetics (ROBIO).