(AFO) VOICE OF THE ENGINEER Design Project Management Introduction - - PowerPoint PPT Presentation

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(AFO) VOICE OF THE ENGINEER Design Project Management Introduction - - PowerPoint PPT Presentation

Nov 12, 2023 313 likes •464 views

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

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SLIDE 1

ACTIVE ANKLE FOOT ORTHOTIC (AFO) VOICE OF THE ENGINEER

Design Project Management

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SLIDE 2

Introduction to the Team

Shane Reardon - (ME) Travis Blais - (ME) Diane Kang - (IE) Austin Frazer – (ME) Gerald Garavuso Team Members Mentor Stakeholders

  • Dr. Lamkin-Kennard
  • Dr. DeBartolo

Christopher Sullivan

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SLIDE 3

Table of Contents

  • Functional Decomposition
  • Benchmarks
  • Specifications
  • House of Quality
  • Family Roadmap
  • Potential Concepts
  • Staffing
  • Feedback
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SLIDE 4

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)

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Functional Decomposition

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Functional Decomposition Cont.

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

Allows adequate motion

Modifies Foot Behavoir

Interprets sensor data Allows plantar flexion and dorsiifle- xion Identifies phase of gait

Utilizes terrain sensing system Compares current and ideal states

Determin es foot position

Senses Terrain Utilizes terrain sensing system

Identifies phase of gait

Controls Foot Position Applies force to foot

Support Portability

Safely store Energy Safely Receive Energy Safely Regulate Energy

Accomodates Range

  • f Users

Easily Adjustable Reduce/ eliminate custom fitting process Removable

Determine Current State Determine Ideal State

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SLIDE 7

NAME

Portable Powered AFO Richie Dynamic Assist Brace Fillauer Dynamic Walk Ossur AFO Dynamic Soft Pneumatic Exoskeleton

DIMENSIONS [Qualitative Size] ? 35 mm Heel Cup. Orthotic Extends approx 8 inches up calf Length (230-270mm), width (67,5-88,5mm??), height (320-370mm) Foot plate: 8.75"-11", Calf Height: 12-15.75", Heel height: 0.4"-0.6" WEIGHT (kg) 3.1 "Lighter than most AFOs" Exact # not given 105-142 g 75-140 g 3 MAX APPLIED TORQUE (Nm) 9Nm at 90 psig assist ? ? ? POWER SOURCE Carbon Dioxide bottle N/A N/A N/A Carbon Dioxide bottle ADVANTAGES Offers a clinical tool in many areas of rehabilitation Supports patients over 200

  • lbs. "Offers dynamic

dorsiflexion assist". Appears to fit inside normal Very lightweight. Fits easily into regular shoes. High strength Fits into shoe very easily, very lightweight soft material, easily adjustable, portable DISADVANTAGES Only lasts 37 minutes and low assistive torque Is not capable of variable force depending on the severity of the foot drop

  • issue. No terrain sensing.

Doesn't appear excessively supportive finite usage time ACTIVE ELEMENT Pneumatic Actuator 2 spring like hinges on either side of the orthotic Semi-rigid material Semi-rigid material Air muscle PERFORMANCE METRICS Range of motion, weight, size Suggested weight range up to 265 lbs EXPERIMENTAL EVALUATION 3 Non disabled walkers and 1 disabled walkers This is commercially available This is commercially available This is commercially available RANGE OF MOTION 15 degrees of dorsiflexion Photo

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Engineering Specification Number Engineering Specification Description Units of Measure Preferred Direction Nominal Value Method of Validation Stems From Customer Need Notes s1 Torque on Foot N-m Up ≥±1.5 Test FT1,2,4,ST1,5 s2 System response time (sensing terrain to actuating device) ms down <150 Test ST3 s10 allowable range of motion between foot and shin degrees range 94.5 to 137.7 Test FT1,3,CF8,9,ST1 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

Specifications

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SLIDE 9

Engineering Specifications Spec s27 s31 s32 s33 Stakeholders need a convenient active ankle foot orthotic to mitigate the effects

  • f foot drop while not constraining user's motion in ways that force unnatural

gait Customer Weights Has housing around electronic components Minimum life until failure Allowable toe extension/flexion Fits with users regular shoe size VOC - Affinity Groups CO # VOC - Customer Objectives Preferred Direction

  • up

up

  • Comfort

CF8 allow toes to flex up 12.0% 9 CF9 keep toes from curling down 9 CF10 aesthetically pleasing CF11 low noise Durability D1 reliable for day to day usasge 10.0% 9 9 D2 sensors/controls withstand elements 9 D3 usable in rain/shower 9 D4 washable 9 Convenient C1 fit into normal shoe size 5.0% 9 C2 reduce time and cost of custom fitting process C3 easy to take off C4 easy to put on C5 easy patient interface with sensing system C6 easily adjustable

House of Quality

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SLIDE 10

Family Roadmap

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SLIDE 11

Potential Concepts

 Ratchet and flexible air muscle pictures

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SLIDE 12

Staffing

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SLIDE 13

Feedback

 Family roadmap and individual project definitions

were all approved.

 Dr. DeBartolo requested project submission into

ASME summer bioengineering competition

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SLIDE 14

Questions?