3D Printed Articulated Prostheses

Abstract

This thesis explores the development and implementation of a 3D-printed prosthetic device that is designed to be easily adaptable, cost-effective, and rapidly producible. The primary objective is to address the immediate needs of individuals requiring temporary prosthetic solutions. While not intended to replace advanced prosthetic devices currently available on the market, this research aims to provide an interim solution that bridges the gap between immediate necessity and long-term rehabilitation. The methodology section details the design process of the prosthesis, including the considerations for joint movement, material selection, scanning process and mechanical properties on top of this to verify results finite element simulation and measurement techniques were used. Results from the design and testing phases are presented, including the mechanical design calculations of the prosthetic fingers using Euler-Bernoulli beam theory, giving minimum height of 6,3 mm for the fingers. The tensile and shear stress results gave a minimum thickness for the hook of 0,0032 mm, and the diameter of the pin of 0,68 mm respectively. Other points of interest were calculated using COMSOL® and verified with SolidWorks®. The results given show the Proximal Interphalangeal (PIP) joints are under a von Mises stress of 2,84x106 N/m2 and a displacement of 1,9x10-3 mm. The metacarpophalangeal joint showed results of a von Mises stress of 9,63x106 N/m2 and a displacement of 2,8x10-2 mm. Lastly, the final prototype is evaluated for its effectiveness, highlighting the balance between structural integrity and material efficiency. This research contributes to the growing field of 3D-printed prosthetics by demonstrating that it is possible to create a functional, affordable, and rapidly deployable prosthesis that can serve as a temporary solution for individuals in critical need, ultimately enhancing the quality of life for those who may otherwise lack access to prosthetic care.