Stem-202 Group Project 4

Participants: Eli Early, Ethan MacIntyre, Leah Clary
Course: STEM Scholars’ Research Lab II, STEM-202-HN01
Mentors: Jane Jones & Madi Sigler
Assignment Title: Accessible prosthesis: Using 3D printing and muscle sensor technology in the creation of a cost-effective extremity.

Abstract

The rising cost of prosthetic devices has intensified the need for affordable, high-performance alternatives. Recent advances in additive manufacturing have demonstrated the potential of 3D printing as a cost‑effective method for producing functional hand prosthetics. The intention was to utilize a 3D‑printed hand model combined with electromyography surface sensor technology to enhance both reliability and user control. The hand was fabricated from durable materials to ensure long‑term use, and the fingers encased fishing lines to mimic tendon‑like function. Surface electrodes capture muscle activity and generate raw signal data, which were processed into a stable voltage output range. This output drove smooth, coordinated movement of the prosthetic hand, improving the interface between user intent and mechanical response. The goal is to give users command of the prosthetic hand to grip, in a closing motion between the four fingers and thumb, onto surfaces and objects to improve their activities of daily living.