Individualized arm shells towards an ergonomic design of exoskeleton robots

This paper introduces a novel method to generate individualized upper extremity exoskeleton structures. This approach aims to overcome micro-misalignments in wearable design technology caused by inter-subject variability. Geometric dimensions of the patient's forearm are measured using a stereo camera and infrared reflecting markers. Surfaces are generated using Delaunay's Triangulation and converted into an STL -file for 3D printing in order to be a more compatible design and produce a swift development of custom-fit exoskeleton structures. This paper summarizes the design steps of individualized structures that could be implemented in future exoskeleton designs. The fitting accuracy was compared to that of non-individualized shells by applying an 8 kg weight onto the worn shells. Results showed a significantly larger pressure distribution and lower maximum pressure among individualized shells compared to non-individualized shells, which results in a 5% higher tolerance to applied pressure of the exoskeleton.

[1]  Jose L Pons,et al.  Wearable Robots: Biomechatronic Exoskeletons , 2008 .

[2]  S. Katz,et al.  STUDIES OF ILLNESS IN THE AGED. THE INDEX OF ADL: A STANDARDIZED MEASURE OF BIOLOGICAL AND PSYCHOSOCIAL FUNCTION. , 1963, JAMA.

[3]  Joel C. Perry.  Design and development of a 7 degree-of-freedom powered exoskeleton for the upper limb , 2006 .

[4]  Domenico Campolo,et al.  Subject-Specific Wrist Model Calibration and Application to Ergonomic Design of Exoskeletons , 2013, IEEE Sensors Journal.

[5]  H K Yuen,et al.  Comparison of three wheelchair cushions for effectiveness of pressure relief. , 2001, The American journal of occupational therapy : official publication of the American Occupational Therapy Association.

[6]  T. R. D. Velho,et al.  A contribution to the development of a human-machine exoskeleton device using rapid prototyping technology , 2011, 2011 IEEE International Conference on Robotics and Biomimetics.

[7]  Massimo Bergamasco,et al.  An arm exoskeleton system for teleoperation and virtual environments applications , 1994, Proceedings of the 1994 IEEE International Conference on Robotics and Automation.

[8]  Sunil Kumar Agrawal,et al.  Design of a Cable-Driven Arm Exoskeleton (CAREX) for Neural Rehabilitation , 2012, IEEE Transactions on Robotics.

[9]  F.C.T. van der Helm,et al.  Kinematic Design to Improve Ergonomics in Human Machine Interaction , 2006, IEEE Transactions on Neural Systems and Rehabilitation Engineering.

[10]  Heinrich Müller,et al.  Improved Laplacian Smoothing of Noisy Surface Meshes , 1999, Comput. Graph. Forum.

[11]  Robert Riener,et al.  ARMin II - 7 DoF rehabilitation robot: mechanics and kinematics , 2007, Proceedings 2007 IEEE International Conference on Robotics and Automation.

[12]  Kuo-Young Cheng,et al.  A sharpness dependent filter for mesh smoothing , 2005, Comput. Aided Geom. Des..

[13]  Tim C. Lueth,et al.  Personal Assistive Devices for Elderlies , 2014 .

[14]  Munsang Kim,et al.  A force reflected exoskeleton-type masterarm for human-robot interaction , 2005, IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans.

[15]  Yutaka Ohtake,et al.  Mesh smoothing via mean and median filtering applied to face normals , 2002, Geometric Modeling and Processing. Theory and Applications. GMP 2002. Proceedings.

[16]  Yutaka Ohtake,et al.  Mesh regularization and adaptive smoothing , 2001, Comput. Aided Des..

[17]  Nicola Vitiello,et al.  NEUROExos: A Powered Elbow Exoskeleton for Physical Rehabilitation , 2013, IEEE Transactions on Robotics.