PowerPoint Presentation

Multi Surface Sensing Ankle Foot Orthotic for Foot DropChristopher R. SullivanMechanical EngineeringStudent Research & innovation SymposiumAugust 12th, 2011Advisor: Elizabeth A. DeBartolo, Ph.D.

Name, department, event, date, advisorGait Cycle and Foot DropImage Source: http://sports.jrank.org/article_images/sports.jrank.org/dorsiflexion.1.jpg100%Foot StrikeOpposite Toe-OffOpposite Foot StrikeToe-OffFoot ClearanceTibia VerticalFoot StrikePeriodsInitial Double-Limb SupportSingle-Limb StanceSecond Double-Limb SupportInitial SwingMid-SwingTerminal SwingStanceSwing% of Cycle0%62%PeriodsInitial SwingMid-SwingTerminal SwingToe-OffSwing% of Cycle62%100%Mid TripFoot CrashFallenFoot Drop is characterized by Inability to control the foot during the Gait CycleStrokeCerebral PalsyDirect injury to the Peroneal Nerve

2What is an Ankle Foot Orthotic?Replace lost ankle functionalityFoot dropCorrect brace for the correct problem

Image Source: http://www.mobilelimbandbrace.com/images/Articulating_AFO_Overlap.gifhttp://www.spsco.com/assets/images/dynamic-walk-single-side-2_large.jpghttp://proactiveasia.com/web_image/orthotics/Trulife%20semi-solid-afo_web.gif

Jointed BraceDynamic Walk

Solid BraceProject GoalCreate an Ankle Foot Orthotic (AFO) that adapts to differing terrain to provide the correct amount of supportTodays talkStakeholder interviewsNeeds assessment Preliminary designPreliminary analysis

Image Source: http://transit-safety.volpe.dot.gov/publications/safety/pedestrian/html/images/dot-tsc-umta-84-36_p0009a.gifStakeholder InterviewsInterviewed Clients, Clinicians,and Prosthetist OrthotistMajor takeawaysFoot drop has many other compound symptomsProsAllow clients to walkConsweight/bulk of the AFOInstability on ramps and stairsAFO users needs can differ widely

Image Source: http://www.humanresourcesdegree.net/images/stories/School%20Logos%20-%20Masters/NazarethCollege.jpg http://www.workforcediversitynetwork.com/images/logos/RGHS_stacked_150.jpghttp://www.rochesterorthopedic.com/

Do justice to the differences in patientsWe talk to a bunch of different patients and all of them had a couple stricking things in commonThey needed there AFO to walk, so anything that I build would have to continue to allow them to walkAll of the patients complained about the instability they felt on stairsExplain why they feel uncomfortable !!!!!!!!!Rochester orthopedic PEDIC LABS

Peoples needs vary widely!Defining the Target ClientsThey should be able to supply feedbackWould not be a candidate for a commercially available AFOMust use a jointed brace I intend to test this device on people and they are going to need to be able to communicate back with me about if they 6Customer NeedsFits into a shoeEase of accessAdjustabilityLight weightPortableInexpensiveAble to be used on both sides of the bodySafetyDurability/fatigue lifeBiocompatible surfaceAble to be cleaned/sterilizedFunctionalityProvide appropriate support for the foot at the appropriate timeStairs RampLevel surfaceMulti Surface Sensing Ankle Foot OrthoticFunctional Block DiagramPowerGround ProfileGround Identification SensorMicro-ControllerPositionActuatorRange of MotionIfStairs or RampLevel GroundInputs out putsFit the 3 slids you are missing into this oneTalk about separating out these different criteria into ways to generate more designs8Proposed DesignAttaches to the back of existing AFOLinear actuator shifts carriage to either side Carriage holds two individually adjustable backstops The actuator doesnt have to support the footInfrared range finderDetect terrain

Include detailed schematic only of final proposed designDistance Detected Level Ground vs. Descending Stairs

Feasability talk about using gait data from other studies to generate simulations of what a distance sensor would need to seeInfra red range finders 10Moment about the Ankle During Swing12345m4m5m3m2m1xI need to know if my design would be able to support the ankle during swing, too gait data and using LaGrange's method calculated out the dynamic moment felt by the ankle due to the weight of the foot and the momentum of it moving.11Next StepsDevice attachment to braceFind Ramp Gait DataSelect and test Range FinderSelect and test ActuatorDefine algorithm for determining floor surfaceModel DesignBuild and testAcknowledgmentsFunding was supplied by the RGHS RIT alliance Seed fundRochester General HospitalRichard L Barbano, MD, Ph.D., FAANAdvisorElizabeth A. DeBartolo, Ph.D.Thesis Committee Mario Gomes, Ph.D.Kathleen Lamkin-Kennard, Ph.D.Nazareth College Physical Therapy ClinicJ.J. Mowder-Tinney PT, PhD, NCSRochester Orthopedic LabsShawn Biehler, CPO

Questions?

LaGrange's MethodConstraintsMetricUnitsTestImportance (1-7)Fits into a shoeBinaryAttempt to fit into a shoe possibly using a floppy (find a better word) foot2Ease of access10 MinAttempt to put on with one hand, time results document relative range of motion necessary to complete task3AdjustabilitycmWhat rand of body types can this AFO fit?5Light weight