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Dorsiflexion-Assisting Ankle Brace

Problem Statement. WhatThe design of a ankle brace that assists in dorsiflexion, designed specifically for an athlete whose desired range of ankle motion is greater then a patient with a goal of only walking.WhenTwo week turn-around from fabricated parts to completed brace constructionWhoDesign

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Dorsiflexion-Assisting Ankle Brace

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    1. Dorsiflexion-Assisting Ankle Brace Andrea Albergo Thomas Burney Lauren Gallagher Alice Hammer Sheila Powenski Ben Yaffe

    2. Problem Statement What The design of a ankle brace that assists in dorsiflexion, designed specifically for an athlete whose desired range of ankle motion is greater then a patient with a goal of only walking. When Two week turn-around from fabricated parts to completed brace construction Who Design is specifically for Jason Williams, and will be individually tailored for his use.

    3. QFD

    4. Product Design Specification Results from QFD Indicated: Mission Statement: An ankle brace will be designed to assist dorsiflexion and cushion heel strike for users with pereneol nerve damage. Customer Needs: Lightweight brace (1-2lbs maximum) Unobtrusive size Design Requirements: Attachment to leg must be secure and comfortable Ability to vary amount of damping Variability of dorsiflexion time

    5. Product Design Specification (cont.) Competition: According to nationally renowned orthotist no products currently exist that enable athletic performance in this type of brace. Intended Market: Product designed specifically for Jason Williams, if successful the brace could possibly be a model for more versatile braces for non-athletic patients. Cost Prediction: $150 - $250, plus occasional part replacement costs

    6. Updated Gantt Chart

    7. Information Gathered The Gait Cycle Eight stages progressing through a single stride Stance Phase: 60% gait Initial Contact to Pre-Swing Hamstrings and dorsiflexors in ankle remain active Quadriceps and gluteal muscles work to maintain stability Swing Phase: 40% gait Initial swing to terminal swing Ankle dorsiflexion occurs with the contraction of anterior tibialis muscle Running Progression of Gait Cycle: Two periods of double float are substituted for the two periods of double support Stance time becomes less then swing time ***Gait cycle to be studied to better understand forces and muscle contractions that are occurring during the walking or running cycle. ***Gait cycle to be studied to better understand forces and muscle contractions that are occurring during the walking or running cycle.

    8. Information Gathered Specific Injury of Patient: Peroneal Mononeuropathy – local damage to a single nerve, commonly the peroneal nerve (not disease or systemic condition) Steppage Gait – walking with a foot drop where toes hang down and foot slaps on heel strike Can be caused by peroneal nerve trauma Causes injured person to lift foot excessively high to avoid dragging toes Causes of Peroneal Neuropathy Knee injury or trauma Injury during knee surgery

    9. Concept Generation – Idea #1 Pro’s Less bulky Less likely to hinder plantar flexion May provide more power for jump Con’s Not best damping solution Springs may fatigue May not work well for low or changing speeds

    10. Concept Generation – Idea #2 Pro’s Most likely to accomplish damping effectively Fewer moving parts for wear and tear Con’s More bulk then other two Needs lubrication May hinder plantar flexion

    11. Concept Generation – Idea #3 Pro’s No unnecessary force to overcome Fewer moving parts Con’s Very intricate design Need Electrical Engineering help Need data on pressure, etc.

    12. Concept Evaluation

    13. Concept Evaluation Pugh Concept Evaluation – led to the decision of….. CONCEPT IDEA #2.

    14. Product Architecture Schematic Diagram

    15. Product Architecture Clustering

    16. Product Architecture Geometric Layout

    18. Design Analysis Kinematics Analysis 7 DOF Angular rotation of upper leg Angular rotation of lower leg Ability to predict the position and rotation of foot during any period of time Dynamics Analysis Impact force of foot hitting the ground Solve for the vertical displacement of the torso during any period of time in the gait cycle.

    19. Design Analysis Contacts Harvey Johnson – professional orthotist with more then 30 years experience in brace construction Mike Huff – KLab Providing experimental results of the rotation of the hip and knee in the gait cycle as a function of time Providing assistance with the use of filming and force plate equipment Dr. Kielb Assistance in the modeling of the lower body during gait cycle

    20. References Gait Cycle - http://www.orthoteers.co.uk/Nrujp~ij33lm/Orthgait.htm#PHASES Walking/Gait Abnormalities – http://health/allrefer.com/health/walking-gait-abnormalities-info.html Ankle & Foot – Biomechanics – http://www.orthoteers.co.uk/Nrujp~ij33lm/Orthfootmech.htm

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