ACTIVE ANKLE FOOT ORTHOTIC AFO VOICE OF CUSTOMER

Table of Contents • • Objective Tree Needs Prioritization Constraints Functional Decomposition Flow Diagram

Needs Prioritization Customers ranked categories of objective tree for importance directly, group members ranked

Constraints Low Weight (of AFO) High Comfort Easy patient interface with sensing system Waterproof

Functional Decomposition The active ankle foot orthotic must mitigate the effects of foot drop.

Flow Diagram The active ankle foot orthotic must mitigate the effects of foot drop.

Summary/Conclusions Stakeholders need a convenient active ankle foot orthotic to mitigate the effect of

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ACTIVE ANKLE FOOT ORTHOTIC (AFO) VOICE OF CUSTOMER Design Project Management

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

Objective Tree

Needs Prioritization Customers ranked categories of objective tree for importance directly, group members ranked every objective and category rankings were calculated: Customer Rank Group rank Perform on Flat Terrain 18. 6% Safe 26% Perform on Flat Terrain 21% Portable 19% Portable 16. 4% Comfortable 12% Safe 16. 2% Durable 10% Convenient 11. 9% Perform on Special Terrain 7% Comfortable 10. 3% Convenient 5% Durable 9. 3% Perform on Special Terrain 17. 3%

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

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

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

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

Questions?