 Team Members: ◦ Pattie Schiotis – Team Manager (ME) ◦ Shane Reardon – Lead Engineer (ME) ◦ Dana Kjolner (EE) ◦ Robert Ellsworth (EE) ◦ Sam Hosig (CE) ◦ John Williams (CE) Faculty Guide: Dr. DeBartolo

 Introduction  Project Background  System Architecture  Component Breakdown ◦ Mechanical Locking System ◦ Electronics Circuit and PCB ◦ Sensors ◦ Microcontroller  Testing Results  Future Work  Demo

 Lasting side effect of a stroke: foot drop ◦ Inability to dorsiflex the foot  Ankle Foot Orthotics (AFOs) currently used to aid dorsi-flexion. ◦ Passive devices don’t allow for movement when walking on ramps and stairs  Foot is always pointed upwards

 User will have no ability to either plantar-flex or dorsi-flex their foot  Side to side stability of the foot will be ignored  Worst case will be analyzed: ◦ 95 percentile male having heavy foot. ◦ Fast walker – gait cycle less than 1 second.  Device may not use air muscles as an actuation source  AFO Custom made for each client

Primary Needs:Secondary Needs:  Safety  Portable ◦ Lasts all day without charging/refueling ◦ Lightweight ◦ Tolerable to wear all day  Reliable  Accommodates Flat Terrain  Accommodates Special Terrain ◦ Stairs ◦ Ramps ◦ Obstacles  Comfortable ◦ Aesthetically Pleasing  Durable ◦ Water Resistant ◦ Corrosion Resistant  Salt & Environment  Biocompatibility  Convenient ◦ Easy to put on and take off

Spec Number Engineering Specification Description Units of Measure Nominal Value s1Torque on Footft-lbf±2 s2 System response time (sensing terrain to actuating device) ms<400 s4predicts step downyes/noyes s5predict flatyes/noyes s7predicts ramp downyes/noyes s10 allowable range of motion between foot and shin degrees70 to 135 s12untethered usage timehrs/steps 10 hrs/ 3000 steps s17force to secure constraintslbf< 18 s18force to remove constraintslbf< 18 s23radius of edges/corners on AFOin<0.02 s24weight of entire devicelbf≤2.2 s28 Operates in environment temperature range °F0-100

 CAD model Sensors Piston/Cylinder Mounting Bracket Valve Battery Processor Reservoir

 Hydraulic locking system  Piston actuates in and out of cylinder during flexion  Valve remains closed on flat terrain ◦ Opens when descending on stairs and ramps

LED SD Card Switch Connector

 Utilize sensor system developed by MS student Christopher Sullivan  Vertical sensor determines if the foot is on or off ground  Forward sensors detects upcoming terrain

 Processing path of microcontroller

 System operates on stairs and ramps  Created a second system without activation for data logging

 Range of Motion ◦ 70.03º º  Weight of Device ◦ 2.42 lbs  Terrain prediction ◦ Detects flat, descending stairs and ramps  System Response Time ◦ Average ~300ms

 Create smaller electronics box  Different battery  SD card expansion board  Human Trials with AFO that fits user

Demonstration