Missing Digit Prosthetic

2023 Mechanical Engineering (ME)

The objective of this project is to design a prosthetic index finger utilizing PZM that provides feedback in response to temperature and pressure.

 

Team Members

Cole Davidson | Katherine Korn | Jacob Lawrence | |

Project Poster

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Project Summary

 

Overview

Prosthetics are a section of the biomedical engineering field with high demand to improve the quality of life of individuals who have lost a significant body part. One of the most crucial body parts is the hand. Hands allow humans the ability to maneuver through life by providing the ability to carry, move, and perform tasks that are essential in day-to-day living. As medical technology advances, there is an emerging need for a mechanical digit prosthetic that can simulate the environment the digit is presented to. Many prosthetics exist today, but most do not utilize a feedback system to improve the utility experience for the user.

Objectives

Design a prosthetic index finger utilizing PZM that provides feedback in response to temperature and pressure.

Approach

  • The goals and expectations for the design were discussed with the project sponsor.
  • Concepts for the attachment mechanism, sensors, and inner finger were generated and selected.
  • To choose an inner finger design, current models were researched and used as a basis.
  • CAD models of the inner finger and outer skin were created.
  • ANSYS was used to model the stress analysis of the finger and determine the force and temperature transferred to the sensors. Hand calculations were completed to verify the ANSYS.
  • ANSYS Granta EduPack was used to select materials for the inner finger and the outer skin.
  • A proof-of-concept prototype was made showing that sensors can detect the force and temperature at the fingertip and can use this data to control an LED light and a vibration sensor. The prototype also shows that the finger can move.

Outcomes

For this project, the team achieved the following:

  • Performed FEA analyses to ensure the strength of the material chosen can endure forces being put on the prosthetic.
  • Selected a microcontroller, muscle sensor, force sensor, temperature sensor, and other components to build a prototype.
  • Built a prototype of the prosthetic to show proof of concept.
  • Presented an alternative solution for individuals with one or more missing digits to regain function and a form of sensation in their lives.