Active Ankle Foot Orthotic (AFO) Voice OF Customer

1. Active Ankle Foot Orthotic(AFO)Voice OF Customer Design Project Management

2. Table of Contents • Objective Tree • Needs Prioritization • Constraints • Functional Decomposition • Flow Diagram • Summary/Conclusions • Questions

3. Objective Tree Objective Tree

4. Needs Prioritization Customers ranked categories of objective tree for importance directly, group members ranked every objective and category rankings were calculated: Customer Rank • Safe 26% • Perform on Flat Terrain 21% • Portable 19% • Comfortable 12% • Durable 10% • Perform on Special Terrain 7% • Convenient 5% Group rank • Perform on Flat Terrain 18.6% • Perform on Special Terrain 17.3% • Portable 16.4% • Safe 16.2% • Convenient 11.9% • Comfortable 10.3% • Durable 9.3%

5. Constraints • Low Weight (of AFO) • High Comfort • Easy patient interface with sensing system • Waterproof • Fits into normal shoe size • Safe • Method of Actuation?

6. Functional Decomposition The active ankle foot orthotic must mitigate the effects of foot drop. Support Portability Modifies Foot Behavoir Allows adequate motion Accomodates Range of Users Compares current and ideal states Controls Foot Position Allows plantar flexion and dorsiifle-xion Reduce/eliminate custom fitting process Removable Safely Receive Energy Safely store Energy Safely Regulate Energy Easily Adjustable Determine Current State Determine Ideal State Applys force to foot Senses Terrain Identifies phase of gait Identifies phase of gait Determines foot position Utilizes terrain sensing system Utilizes terrain sensing system Interprets sensor data

7. The active ankle foot orthotic must mitigate the effects of foot drop. Flow Diagram Record Data ON/OFF Micro-Controller Compare Real and Ideal States Terrain Type Identify Action Determine Actual State Actuate Device Apply Force or Allow Movement Phase of Gait Determine Ideal State Check for Errors Monitor System Status Health of System Monitor Energy Level Waste Energy (Noise, Heat, Vibration, etc) Store Energy Regulate Power Receive Power Power

8. Summary/Conclusions • Stakeholders need a convenient active ankle foot orthotic to mitigate the effect of foot drop while not constraining user’s motion in ways that force unnatural gait. • Moving forward it is likely that the scope will be limited to: • An untethered active AFO using an actuation source other than air muscles • A tethered rehabilitation active AFO using air muscles

9. Questions?