mitsp 733s10 lego knee

8/3/2019 MITSP 733S10 Lego Knee

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Jaipur Knee Upgrade Project

Frieder Wittmann

Jared Markowitz

Courtesy of Dr. Pooja Mukul, Bhagwan Mahaveer Viklang

Sahayata Samiti - Jaipur Foot Organization, Jaipur, India.

Used with permission.


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Jaipur Knee Project: Need Above knee prosthesis designed for extreme

affordability (< $30).

Built for BMVSS group in India; requiresefficient, cheap manufacturing with materialsthat are locally available.

BMVSS fits about 20,000 artificial limbs annuallyfree of charge, with about 1/3 of these beingabove-knee amputations.


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Background: Design RequirementsProsthetic knee needs to:

Be safe and robust

Be stable during stance phase Promote natural gait

Be cosmetically appealing

Enable squatting Easy to fit and align


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Current Knee Prostheses

Stability Poor

Low

Poor

Low

Excellent

Low

Poor

Low

Excellent

Mid

Mid

Mid

Excellent

High

Excellent

High

Excellent

High

Excellent

High

Cost

Gait Efficiency

Weight

Single Axis Polycentric HydraulicMicro-

Controlled

Friction

Brake

Image by MIT OpenCourseWare.


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Stanford Group Design

Four link structure

Polymer-based

Polycentric

Affordable (


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Kamal on his arrival

at the Jaipur footclinic, 1.5 years afterhe was amputated

above his knee.

Courtesy of Dr. Pooja Mukul, Bhagwan Mahaveer ViklangSahayata Samiti - Jaipur Foot Organization, Jaipur, India.



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Kamal on his third day with the prosthesis





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Close to natural gait





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How can we build upon this design?


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Improving Shock AbsorptionIncreasing shockabsorption during heelstrike would greatly improvethe comfort of the userwhile walking.

Photo of man walking with prosthetic leg and engineering

drawing showing stress at joints of prosthetic knee have

been removed due to copyright restrictions.


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Cosmetic ImprovementsNeed to minimize noiseoutput of device due tocontacting elements.

Photo of Jaipur Foot with prosthetic knee

Appearance is extremelyremoved due to copyright restrictions. important- can design anattractive, functionalcosmesis.


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Adding a Manual Lock MechanismThis improvement wouldbe simple to implement andwould improve stability forthe user.

Engineering drawing of prosthetic knee with manual

lock mechanism removed due to copyright restrictions.


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Easing squattingSquatting is critical forreligious practices and otheraspects of life in India.

Photo of man kneeling with prosthetic knee and leg

has been removed due to copyright restrictions.

We can improve the abilityof an amputee to rise aftersquatting by adding anextension assistmechanism.


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Join us!


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MIT OpenCourseWarehttp://ocw.mit.edu

SP.733 Special Topics at Edgerton Center:Developing World Prosthetics

Spring 2010

For information about citing these materials or our Terms of Use, visit:http://ocw.mit.edu/terms.
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mitsp 733s10 lego knee

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