Sierra Leone Prosthetic Ankle

Students: Andrew Harring, Cesar Nunez, Eric Shults, Jared Byers, Kassi Smith,

Lowell Troyer, Prabin Pandey, Veronica Perez

Sponsors: Gene Jones, Raymond Pye

Vision

The lack of custom fit prosthetics means that many citizens in Sierra Leone live with low mobility, and with the negative stigma

that comes from being an amputee.

Prosthetics Outreach Foundation is partnering with WSU to create a low-cost prosthetic ankle which can be made from

readily available, low cost materials.

Specifications

• Fabrication with basic machining tools • Ensure the ankle will fit within a

cosmetic cover • 10% of flexural strength of material • Range of body weights • 5 degrees of flexure • Attach to pylon and foot • Maintain strength with various motions • Use a low cost, easily obtained material

Project Components

1. CAD/FEA Design and modeling of possible configurations

2. Fabrication and machining of parts

3. Designing fatigue test machine

4. Fatigue testing of assembled prosthetic

First concept for ankle design, did not fit within cosmetic cover

Forcer absorber concept #1 to fit within cosmetic

cover

Current and proposed design for fatigue test

setup

Force absorber concept #2 to fit within cosmetic

cover