ACTIVE ANKLE FOOT ORTHOTIC (AFO) VOICE OF THE ENGINEER Design Project Management
Introduction to the Team Mentor Team Members Shane Reardon - (ME) Gerald Garavuso Travis Blais - (ME) Stakeholders Diane Kang - (IE) Dr. Lamkin-Kennard Austin Frazer – (ME) Dr. DeBartolo Christopher Sullivan
Table of Contents Functional Decomposition • Benchmarks • Specifications • House of Quality • Family Roadmap • Potential Concepts • Staffing • Feedback •
Overview Lay out roadmap for air muscle-driven active Ankle- Foot Orthotic Eliminate the condition known as “foot drop” Midstance Foot Drop (Between Propulsive and Contact Phase)
Functional Decomposition
Functional Decomposition Cont. The active ankle foot orthotic must mitigate the effects of foot drop. Allows Support Accomodates Range Modifies Foot Behavoir adequate Portability of Users motion Allows Controls Foot Easily Adjustable Safely Regulate Safely Receive Compares current and ideal states Reduce/ plantar Safely store Removable Position eliminate flexion Energy Energy Energy custom and fitting dorsiifle- process xion Determine Current Applies force Determine Ideal State State to foot Identifies Identifies Determin Senses phase of phase of es foot Terrain gait position gait Utilizes Utilizes Interprets terrain sensor terrain data sensing sensing system system
Portable Powered Richie Dynamic Fillauer Dynamic Soft Pneumatic Ossur AFO Dynamic NAME AFO Assist Brace Walk Exoskeleton 35 mm Heel Cup. Orthotic Length (230-270mm), width Foot plate: 8.75"-11", Calf DIMENSIONS [Qualitative ? Extends approx 8 inches up (67,5-88,5mm??), height Height: 12-15.75", Heel Size] calf (320-370mm) height: 0.4"-0.6" "Lighter than most AFOs" WEIGHT (kg) 3.1 105-142 g 75-140 g 3 Exact # not given MAX APPLIED TORQUE 9Nm at 90 psig assist ? ? ? (Nm) POWER SOURCE Carbon Dioxide bottle N/A N/A N/A Carbon Dioxide bottle Supports patients over 200 Very lightweight. Fits easily Offers a clinical tool in many Fits into shoe very easily, soft material, easily lbs. "Offers dynamic ADVANTAGES into regular shoes. High areas of rehabilitation very lightweight adjustable, portable dorsiflexion assist". strength Appears to fit inside normal Is not capable of variable Only lasts 37 minutes and Doesn't appear excessively force depending on the DISADVANTAGES finite usage time low assistive torque supportive severity of the foot drop issue. No terrain sensing. 2 spring like hinges on ACTIVE ELEMENT Pneumatic Actuator Semi-rigid material Semi-rigid material Air muscle either side of the orthotic Range of motion, weight, Suggested weight range up PERFORMANCE METRICS size to 265 lbs EXPERIMENTAL 3 Non disabled walkers and This is commercially This is commercially This is commercially EVALUATION 1 disabled walkers available available available RANGE OF MOTION 15 degrees of dorsiflexion Photo
Specifications Engineering Engineering Specification Units of Preferred Nominal Method of Stems From Specification Notes Description Measure Direction Value Validation Customer Need Number s1 Torque on Foot N-m Up ≥ ±1.5 Test FT1,2,4,ST1,5 System response time (sensing s2 ms down <150 Test ST3 terrain to actuating device) allowable range of motion 94.5 to s10 degrees range Test FT1,3,CF8,9,ST1 between foot and shin 137.7 s12 untethered usage time hrs/steps up >3000 steps P1,2,D1 project dependant s14 fits calf (diameter) mm range 292 to 433 Measurement CF1,3,5 user dependent s15 fits foot (length) mm range 212 to 317 Measurement CF1,3,5 user dependent s17 force to secure constraints N down < 80 N Test C4 s18 force to remove constraints N down < 80 N Test C3 s24 weight of entire device kg down ≤2 or ≤3 weigh FT6 s31 Minimum life until failure steps up 5.5 million test D1 s32 Allowable toe extension/flexion degrees range 0-50 test CF8, CF9
House of Quality Engineering Specifications s27 s31 s32 s33 Spec Fits with users regular shoe Minimum life until failure electronic components Has housing around Customer Weights extension/flexion Allowable toe Stakeholders need a convenient active ankle foot orthotic to mitigate the effects size of foot drop while not constraining user's motion in ways that force unnatural gait up up - - Preferred VOC - Affinity Groups CO # VOC - Customer Objectives Direction CF8 allow toes to flex up 9 CF9 keep toes from curling down 9 Comfort 12.0% CF10 aesthetically pleasing CF11 low noise D1 reliable for day to day usasge 9 9 D2 sensors/controls withstand elements 9 Durability 10.0% D3 usable in rain/shower 9 D4 washable 9 C1 fit into normal shoe size 9 C2 reduce time and cost of custom fitting process C3 easy to take off Convenient 5.0% C4 easy to put on C5 easy patient interface with sensing system C6 easily adjustable
Family Roadmap
Potential Concepts Ratchet and flexible air muscle pictures
Staffing
Feedback Family roadmap and individual project definitions were all approved. Dr. DeBartolo requested project submission into ASME summer bioengineering competition
Questions?
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