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Sensors 2018, 18(3), 706;

An Affordable Insole-Sensor-Based Trans-Femoral Prosthesis for Normal Gait

Centre for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
Department of Physical Medicine and Rehabilitation, All India Institute of Medical Sciences, New Delhi 110029, India
Department of Biomedical Engineering, All India Institute of Medical Sciences, New Delhi 110029, India
Author to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 15 February 2018 / Accepted: 19 February 2018 / Published: 27 February 2018
(This article belongs to the Special Issue Sensors for Gait, Posture, and Health Monitoring)
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This paper proposes a novel and an affordable lower limb prosthesis to enable normal gait kinematics for trans-femoral amputees. The paper details the design of a passive prosthesis with magneto-rheological (MR) damping system and electronic control. A new control approach based on plantar insole feedback was employed here. Strategically placed sensors on the plantar insole provide required information about gait cycle to a finite state controller for suitable action. A proportional integral (PI) based current controller controls the required current for necessary damping during gait. The prosthesis was designed and developed locally in India keeping in view the cost, functionality, socio-economic, and aesthetic requirements. The prototype was experimentally tested on a trans-femoral amputee and the results are presented in this work. The implementation of the proposed design and control scheme in the prototype successfully realizes the notion that normal gait kinematics can be achieved at a low cost comparable to passive prostheses. The incurring cost and power expenditure of the proposed prosthesis are evaluated against passive and active prostheses, respectively. The commercial implications for the prosthesis were explored on the basis of recommendations of ISPO Consensus Conference on Appropriate Prosthetic Technology in Developing Countries. The key objective of this work is to enable lucid design for development of an affordable prosthesis in a low-resource setting. View Full-Text
Keywords: lower limb prosthesis; trans-femoral amputee; MR damper; knee damping control lower limb prosthesis; trans-femoral amputee; MR damper; knee damping control

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Pandit, S.; Godiyal, A.K.; Vimal, A.K.; Singh, U.; Joshi, D.; Kalyanasundaram, D. An Affordable Insole-Sensor-Based Trans-Femoral Prosthesis for Normal Gait. Sensors 2018, 18, 706.

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