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PROSTHETIC FOOT Design|
Download the summary report (144 KB, PDF format) Download the complete report. Includes test results for eversion, dorsiflexion impact absorption, energy return and torsion characteristics. (588 KB, PDF format) View Power Point presentation |
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Current prosthetic foot designs do not replicate the exact characteristics of a normal human foot. The basis of this investigation is to research current prosthetic feet in order to design and build a more human like prosthesis. The characteristics involved in normal walking include dorsiflexion, eversion, energy return, torsional properties and impact absorption.
Tests previously undertaken by REHABTech have determined the eversion, dorsiflexion and energy return characteristics of a selection of prosthetic feet. The additional properties of impact absorption and torsion were undertaken in this investigation. The characteristics displayed in the prosthetic feet tested were compared to those of a human foot. The characteristics exhibited by prostheses which compared favourably to those of a human foot were investigated further. Analysis of these prosthetic feet identified the componentry and material properties required to fulfill the desired characteristics.
The basis of the new prosthetic design combines current prosthetic design elements, such as material and components. Our design incorporates a modified Seattle Natural Foot keel used in conjunction with an ankle section. This enables the prosthesis to have better impact absorption at heel strike. The geometry of the ankle section of the keel is narrowed to enable for greater torsional properties. The heel used in the new design is a Otto Bock IS70, low density, polyurethane wedge. The filler foam selected is the Seattle Natural Foot foam which is made of high grade, medium density polyurethane. this foam provides eversion, torsion and secondary absorption properties, as well as a durable and aesthetically pleasing cosmesis.
In undertaking such a design, the new multi - function prosthesis will exhibit a greater range of characteristics than those displayed in current prosthetic feet. In doing so the new prosthesis will enable a closer representation of the function of a normal human foot.
