SHAPE & ROLL: COSMETIC SHELL Parhys L. Napier Nicholas Torgerson SP.718: Developing World Prosthetics May 14, 2010 1
BACKGROUND Jaipur is one of the most well-known organizations for prosthetic devices developing countries. The Jaipur Foot is an easy to manufacture prosthetic foot that gives patients the ability to do many things that they could do with an actual foot (running, climbing, etc.). The Jaipur Foot is comprised of simple materials and can be colored to match the complexion of patients. It also allows for dorsiflexion like a biological foot. Although the Jaipur Foot is indeed a remarkable device, it is not without its faults. The Jaipur Foot lacks toe support, resulting in a shortened stride while walking. Also, the use of different materials in the Jaipur Foot causes deterioration when they rub against each other. Additionally, the Jaipur Foot is quite heavy; its current design weighs roughly 800 g. Figure 1 - Shape & Roll Foot To address the problems of the Jaipur Foot, the Shape & Roll foot (Figure 1) was created by a team of researchers at Northwestern University in 2004. It was created for use in low-income countries, as an alternative to the prosthetic feet commonly distributed. The S&R closely resembles the roll-over contour of a normal stride. The S&R is far lighter than the Jaipur Foot (made from polyethylene) and is low in cost to make. Attempts to make a cover for the S&R have been less than successful. Although the S&R can operate without a cover, a cover is desired so that the device is well-received by patients living in developing countries. Previous attempts of Shape & Roll feet with cosmetic covers have still been heavy. One cosmetic shell design was tested by researchers at Cornell University, but it eventually wore out in a couple of months. GOALS Our main objective of this project was to create a cosmetic cover to coat the Shape&Roll prosthetic foot. This coating needs to be durable, and yet it also needs to be reasonably cheap.
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