Design of a fully passive prosthetic knee mechanism for transfemoral amputees in India. Murthy Arelekatti, V. and Winter, A. In 2015 IEEE International Conference on Rehabilitation Robotics (ICORR), pages 350–356, August, 2015.
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An estimated 230,000 above-knee amputees are in need of prosthetic devices in India with a majority of them facing severe socio-economic constraints in their daily lives. However, only a few affordable, passive prosthetic knee devices in the market have been designed to enable normative gait and to meet the unique daily life needs of above-knee amputees in the developing world. This paper builds upon our past study, which established optimal mechanical component coefficients in prosthetic knee function required for achieving able-bodied kinematics. We present a mechanism for the design of a fully passive prosthetic knee device, which aims to facilitate able-bodied kinematics at a low metabolic cost. The mechanism is implemented using an automatic early stance lock for stability, a linear spring for early stance flexion-extension and a differential friction damping system for late stance and swing control. For preliminary validation of the knee mechanism, we carried out a field trial on two above-knee amputees in India, which showed satisfactory performance of the early stance lock and enabled smooth stance to swing transition by timely initiation of late stance flexion.
@inproceedings{murthy_arelekatti_design_2015,
	title = {Design of a fully passive prosthetic knee mechanism for transfemoral amputees in {India}},
	doi = {10.1109/ICORR.2015.7281224},
	abstract = {An estimated 230,000 above-knee amputees are in need of prosthetic devices in India with a majority of them facing severe socio-economic constraints in their daily lives. However, only a few affordable, passive prosthetic knee devices in the market have been designed to enable normative gait and to meet the unique daily life needs of above-knee amputees in the developing world. This paper builds upon our past study, which established optimal mechanical component coefficients in prosthetic knee function required for achieving able-bodied kinematics. We present a mechanism for the design of a fully passive prosthetic knee device, which aims to facilitate able-bodied kinematics at a low metabolic cost. The mechanism is implemented using an automatic early stance lock for stability, a linear spring for early stance flexion-extension and a differential friction damping system for late stance and swing control. For preliminary validation of the knee mechanism, we carried out a field trial on two above-knee amputees in India, which showed satisfactory performance of the early stance lock and enabled smooth stance to swing transition by timely initiation of late stance flexion.},
	booktitle = {2015 {IEEE} {International} {Conference} on {Rehabilitation} {Robotics} ({ICORR})},
	author = {Murthy Arelekatti, V.N. and Winter, A.G.},
	month = aug,
	year = {2015},
	keywords = {Assembly, India, Kinematics, Knee, Prosthetic knee, Shock absorbers, Springs, Transfemoral amputation, able-bodied kinematics, above-knee amputees, automatic early stance lock, damping, differential friction damping system, early stance flexion-extension, friction, fully passive prosthetic knee mechanism, late stance, linear spring, normative gait, optimal mechanical component coefficients, passive prosthesis, prosthetics, stability, stance control, swing control, transfemoral amputees},
	pages = {350--356}
}
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