Development of a Passive Modular Knee Mechanism for a Lower Limb Exoskeleton Robot and Its Effectiveness in the Workplace

Quasi-passive or passive mechanisms used for exoskeleton robots for load-carrying augmentation have been developed for reducing development cost, robot weight, and external energy consumption for augmentation. These mechanisms have been developed based on biomechanical analyses of specific motions; however, few mechanisms do not include mechanical elements, such as springs and dampers. In this paper, a movable instantaneous center of rotation (M-ICR) linkage mechanism developed for the knee in the lower extremity exoskeleton without using mechanical elements is presented. Wearability and augmentation functions are considered. Based on these functions, design optimization is achieved using the PIAnO tool. To verify the augmentation function, the Solidworks tool is used. To verify the effectiveness of the M-ICR knee mechanism, oxygen consumption and the vertical ground reaction force are measured while walking with a barbell (0 kg, 10 kg, 20 kg) and while standing with a grinder with and without wearing the exoskeleton robot.

[1]  Donghwan Kim,et al.  Mechanical design of the Hanyang Exoskeleton Assistive Robot(HEXAR) , 2014, 2014 14th International Conference on Control, Automation and Systems (ICCAS 2014).

[2]  Steven H. Collins,et al.  An exoskeleton using controlled energy storage and release to aid ankle propulsion , 2011, 2011 IEEE International Conference on Rehabilitation Robotics.

[3]  H. Kazerooni,et al.  Biomechanical design of the Berkeley lower extremity exoskeleton (BLEEX) , 2006, IEEE/ASME Transactions on Mechatronics.

[4]  Aaron M. Dollar,et al.  Design and Evaluation of a Quasi-Passive Knee Exoskeleton for Investigation of Motor Adaptation in Lower Extremity Joints , 2014, IEEE Transactions on Biomedical Engineering.

[5]  Edmond Ayyappa.  Normal Human Locomotion, Part 2: Motion, Ground‐Reaction Force and Muscle Activity , 1997 .

[6]  S. Gard,et al.  The Influence of Four‐Bar Linkage Knees on Prosthetic Swing‐Phase Floor Clearance , 1996 .

[7]  Ken Endo,et al.  A Quasi-Passive Leg Exoskeleton for Load-Carrying Augmentation , 2007, Int. J. Humanoid Robotics.

[8]  Daniel P. Ferris,et al.  State of the Art and Future Directions for Lower Limb Robotic Exoskeletons , 2017, IEEE Transactions on Neural Systems and Rehabilitation Engineering.

[9]  Marco Ceccarelli,et al.  Design and Characterization of a Novel Knee Articulation Mechanism , 2016 .

[10]  M. de Looze,et al.  The effects of a passive exoskeleton on muscle activity, discomfort and endurance time in forward bending work. , 2016, Applied ergonomics.

[11]  Michelle M. Lusardi,et al.  Orthotics & prosthetics in rehabilitation , 2013 .

[12]  F Freudenstein,et al.  Kinematics of the human knee joint. , 1969, The Bulletin of mathematical biophysics.

[13]  C W Radcliffe.  Four-bar linkage prosthetic knee mechanisms: Kinematics, alignment and prescription criteria , 1994, Prosthetics and orthotics international.