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AssistOn-Finger: An under-actuated finger exoskeleton for robot-assisted tendon therapy

Published online by Cambridge University Press:  17 July 2014

Ismail Hakan Ertas ,
Elif Hocaoglu  and
Volkan Patoglu
Ismail Hakan Ertas
Affiliation:
Faculty of Engineering and Natural Sciences, Sabanci University, 34956 Istanbul, [email protected], [email protected]
Elif Hocaoglu
Affiliation:
Faculty of Engineering and Natural Sciences, Sabanci University, 34956 Istanbul, [email protected], [email protected]
Volkan Patoglu*
Affiliation:
Faculty of Engineering and Natural Sciences, Sabanci University, 34956 Istanbul, [email protected], [email protected]
*
*Corresponding author. E-mail: [email protected]
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Summary

We present AssistOn-Finger, a novel under-actuated active exoskeleton for robot-assisted tendon therapy of human fingers. The primary use for the exoskeleton is to assist flexion/extension motions of a finger within its full range, while decreasing voluntary muscle contractions helping to keep the tendon tension levels to stay within acceptable limits, avoiding gap formation or rupture of the suture. The device can also be employed to administer range of motion (RoM)/strengthening exercises. AssistOn-Finger is designed to be passively back-driveable, can cover the whole RoM of patients, and can do so in a natural and coordinated manner. In particular, the device employs human finger as an integral part of its kinematics and when coupled to a human operator, the parallel kinematic structure of exoskeleton supports three independent degrees of freedom, dictated by the kinematics of the human finger. Automatically aligning its joint axes to match finger joint axes, AssistOn-Finger can guarantee ergonomy and comfort throughout the therapy. The self-aligning feature also significantly shortens the setup time required to attach the patient to the exoskeleton. We present the kinematic type selection for the exoskeleton to satisfy the design requirements for tendon therapy applications, detail optimal dimensional synthesis of the device considering trade-offs between multiple design criteria and discuss implementation details of the exoskeleton. We also present feasibility studies conducted on healthy volunteers and provide statistical evidence on the efficacy of exoskeleton driven exercises in keeping the average muscle recruitment and the maximum tendon tension levels as low as human guided therapies.

Keywords

Finger exoskeletonTendon therapyRehabilitationDesign optimizationDimensional synthesisUnder-actuation
Type
Articles
Information
Robotica , Volume 32 , Issue 8: Rehabilitation Robotics and Human-Robot Interaction , December 2014 , pp. 1363 - 1382
Copyright
Copyright © Cambridge University Press 2014 

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