Project
| # | Title | Team Members | TA | Documents | Sponsor |
|---|---|---|---|---|---|
| 9 | Affordable universal controller for upper limb prosthetics |
Kathleen Beetner Leanne Lee Minwoo Cho |
Nikhil Arora | design_document1.pdf final_paper1.pdf photo1.jpg photo2.jpg presentation1.pdf proposal3.pdf video |
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| # Affordable universal controller for upper limb prosthetics Team Members: - Minwoo Cho (minwooc2) - Leanne Lee (leannel2) - Kathleen Beetner (beetner2) # Problem Around 3 million people worldwide need a prosthetic limb replacement, 2.4 million of which live in developing countries. Even though the World Health Organization estimates that only 27-48% of upper limb amputees have some form of prosthetics, the market for these prosthetics reached $720.86 million and is projected to grow 4.6% over the next year. At a price point of $50,000-$500,000, the exorbitant cost makes them inaccessible to many patients. One reason for the high costs is the lack of common parts between the various types of prosthetics. Each prosthetic part is designed separately on its own to fulfill the unique needs of a patient and repairs are costly, time-consuming, and can only be done by a prosthetic professional. Accumulation of cost continues to escalate for children with prosthetics who need to not only buy replacement parts but also buy entirely new prosthetics with age. In addition, existing prosthetics still struggle with electromagnetic interference that creates inaccuracy in market sEMGs (surface electromyograms). # Solution Our solution will focus on building an EMI-shielded standalone sEMG device that can be fitted to various designs of prosthetic devices. Because our solution aims to be universally compatible, manufacturers can focus strictly on the mechanical design of the prosthetic and patients can select any compatible prosthetic without compromising functionality. A modular sEMG device also allows easier replaceability and repairability when a prosthetic gets damaged or when children grow out of their prosthetics. Instead of buying an entirely new prosthetic, a prosthetic-user only needs to buy and replace the mechanical component of a prosthetic. Prosthetics can even be built using a 3D printer, saving time and reducing cost of materials. # Solution Components ## Subsystem 1: EMG Sensor Surface EMG electrodes (sEMG)(H124SG Covidien) will measure the EMG signal of the upper limb. The sEMG sensor will be connected to the PCB design responsible for filtering and amplification of the EMG signal. ## Subsystem 2: Processor We will use a microcontroller (ATMEGA328P) that uses MathWorks simulink support package for digital signal processing. ## Subsystem 3: Electromagnetic Interference Shielding Copper shielding(https://www.adafruit.com/product/1168) will cover our PCB design to reduce the outside noise and interference. Typical readings in our circuit will be around 20 uV so our design in various environments should be able to function properly with little to no interference. ## Subsystem 4: Output prosthetic A 3D printed hand will be used to exhibit the compatibility and practicality between a prosthetic and removable EMG device. ## Subsystem 5: Power We will use a 3.7V rechargeable lithium ion battery (https://www.digikey.com/en/products/detail/adafruit-industries-llc/2011/6612469) to make the device as portable as possible. # Criterion For Success The EMG device should be easily removable and replaceable. Our EMG device should be able to correctly interpret muscle activity for the motions below. We will mount sensors onto the forearm and categorize the signal patterns through Matlab to identify motions on the working hand. This is the primary goal of our project. We will build a rudimentary hand prosthetic for prosthetic demonstration and convert the readings into prosthetic movements. Our design should be able to accurately mimic the following motions: Palmar supination (turn wrist so palm is facing up), Palmar pronation (turn wrist so palm is facing down), Complete digit flexion and extension (closing and opening all fingers). Total budget is strictly less than $400. |
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