BioSTEP: Transfemoral ProstheticVy Ho, Lyndsy Shaubach, Daniel Yeisley

IV. DesignMaterials: 1060 Aluminum AlloyDimension: Designed for a 5’10” personStress analysis:Load applied: 700N (approx. 157 lbs)Safety factor: 3 (for statics) & 3.7 (for dynamics)Any material with a Yield Strength of greater than 30MPa

Slip-cover with velcro attach

Residual limb fitting in the socket

I. Introduction

Sub-Saharan Africa is a prime example of the disparity between a need and resources in place to mitigate that need. The implementation of affordable and sustainable medical technologies is paramount and the installation of prosthetics would be a leap in the right direction.

Source: Engineering.com Northwestern University Prosthetics-Orthotics Center

Socket: The interface between residual limb and prosthesisDesign constraints: • Comfort• Adjustable• Light-weight• Durable• Low-cost• Easy to manufacture in developing countries.

II. Inspirations

Socket-less Socket Infinite Socketby Martin Bionics by LIM Innovations($3,000 - $10,000) ($7,000 - $30,000)

Both of these designs use struts as external components that support the limb via compression and are stabilized by multiple buckle-ladders around the patient's’ residual limb.

III. Client

CURE International Hospital in Kijabe, Kenya

“Healing changes everything”

V. AcknowledgementsDr. Eric Shoemaker for his expertise in prostheticsDr. Emily Farrar for advising us throughout the processBioSTEP members for all the hard-work and the encouragements

VI. References“Socket-less Socket” - Martin Bionics

“Infinite Socket” - LIM Innovations

IV. Design (Cont.)The patient’s residual limb will be suspended and stabilized by the four aluminum struts which distribute the load across the limb and are covered by fabric with velcro strips that hold the padded insert. One of the struts is designed to be free-hanging making it more adjustable. The belts will be buckled around the struts in several places; one of them will be wrapped around the opposite hip to help keep the prosthesis comfortable and in the right place.

Base and attached struts Free-hanging strut Full model with belts

VI. Contact us

Project adviser: Dr. Emily Farrar - efarrar@messiah.eduPrimary contact: Daniel Yeisley - dy1163@messiah.edu

Residual limb