Andrea Castañeda, Daniel Miranda, Jennifer Wang, Kevin Yeroushalmi, Joseph Youssef

Course Advisors: Gordana Vunjak-Novakovic, Keith Yeager, Aaron Kyle, Sarindr Bhumiratana, Matthew Bouchard

Project Advisor: Professor Clark HungConsultants: Professor Gerard Ateshian, Professor David Vallancourt, Yukkee Cheung

BackgroundCurrent status of design

Tremor detection system Dampening system

Demonstration of functionalityTesting dataNext steps

5.5 million Americans suffer from intention tremors, which affect their ability to perform daily activities

Our design targets the area of the arm which is most affected by these tremors

Our device counteracts these tremors by counteracting unwanted motion in the arm and wrist

Regulatory Pathways Relatively unhindered by regulatory

committees No FDA or Pre-Market Approval (PMA) IRB approval

Sales Strategy Online Retail 30 Day Money Back Guarantee Warranty/Servicing Retail Price: $1000

Transcutaneous Electrical Nerve Stimulator (TENS)-- 60 mA, 4-6 Hz settings simulate intention tremors

5-7 lbs of dampening force counteract induced tremors at frequencies of 4-6 Hz

Tremor Detection

TENS

Accelerometer

Microcontroller

Defined parameters

Motion Dampening

Rotary damper

Acrylic moment arms

Wrist brace Straps

Arm forces

TENS + Elbow Brace

TENS

Control

TENS + Elbow & Wrist Brace

TENS + Wrist Brace

Identified Problems Proposed Solutions

Arm shifts within bulky attachment

Narrower bars/more rigid restraints shaped like arm

Detection not incorporated into dampener

Finalize electronic circuit

Static hinge Fabricate central axel and assemble dynamic hinge

Current TENS setup may not accurately represent a tremor

More leads or more accurate placement of leads

Dampening Clutch Design

Rotary damper

Gear Solenoid

Possible Issues Possible Solutions

Velcro allows for shifting Adjustable straps and anatomically molded pieces

Accelerometer inaccuracy Magnetic encoder

Overdampening Hinge with lower torque rating

Solenoid/clutch mechanism does not lock

Explore other actuation options

Detection system senses tremors

Mechanical system dampens up to ~50%

Integration of detection mechanism will allow for dynamic dampening

Consolidation of parts will yield ergonomic device

Course Advisors Gordana Vunjak- Novakovic,

PhD Aaron Kyle, PhD Keith Yeager, MS Matthew Bouchard Sarindr Ick Bhumiratana

Project Advisor Clark Hung, PhD

Consultants Gerard Ateshian, PhD David Vallancourt,

PhD Yukkee Cheung