Field Measurement of Running ImpactsOverviewProblem StatementBackgroundCurrent MethodsDesign RequirementsProposed Design #1: Wired DeviceProposed Design #1Proposed Design #2: Wireless DeviceProposed Design #2Proposed Design #3: Microcomputer DeviceProposed Design #3Design MatrixFuture WorkAny Questions?Field Measurement of Running ImpactsTeam: Chelsea Wanta, Amanda Feest, Matt Kudek, Nicole Daehn, Lindsey CarlsonBME 201March 9, 2007Client: Dr. Bryan Heiderscheit, PhD, PT Advisor: Paul ThompsonOverviewProblem StatementBackgroundDesign RequirementsProposed DesignsDesign MatrixFuture WorkQuestionsProblem StatementDesign a portable system to measure tibial accelerations. This system would incorporate the use of an accelerometer and a data logger.BackgroundTibial stress fractures One of the most serious running injuriesTibia absorbs force of impact instead of muscleGreater forces on tibia may increase risk of stress fractureKnee contact angle also has an effect on severity of impactCurrent MethodsPatient runs on a force plate in lab Accelerometer is directly connected to PCHard-wired through roomThis system requires extensive wiring Limited testing for different running surfacesDesign RequirementsPortable systemLightweight accelerometer worn on legUniaxialMeasures up to 40G peak accelerationData loggerSampling rate of 1,000-2,000 HzMultiple analog inputsSupply power to accelerometer(s)Design should not affect runner’s gaitPrototype completed for use this summerProposed Design #1: Wired DeviceDescriptionData logger worn on belt Accelerometer wired to loggerData logger provides power to accelerometerProposed Design #1ProsReliable signalOnly one power source neededGood design to evaluate feasibility of a portable systemConsWires on leg may be bothersomeBelt with logger may be bulkyProposed Design #2: Wireless DeviceDescriptionBluetooth communication between componentsData logger worn on beltSelf-powered accelerometerProposed Design #2ProsNo wiresPotential to download directly to a PDA or watchConsSignal can be unreliable at timesIncreased weight of accelerometerDifficult to manufactureBelt with logger may be bulkyProposed Design #3: Microcomputer DeviceDescriptionEntire device worn on leg Accelerometer attached to microcomputerMicrocomputer analyzes/stores dataDownloads later to a PCOne power source for entire systemAccelerometer AmplifierAnalog to Digital ConverterMicrocomputerProposed Design #3ProsCompact device worn completely on legReliable signalOne power sourceConsNot feasible within time constraints of courseRequires advanced knowledge of circuitsUnknown if device would alter runner’s gaitDesign MatrixWired Wireless MicrocomputerSignal Reliability (40)10 7 10Feasibility (30)10 6 3Lightweight on leg (20)9 7 6Comfort (10)6 7 8Total (100) 94 61 69Future WorkFinalize purchase of data loggerDecide on an accelerometer Order components Construct prototypeTestingMake adjustments, if necessaryAny
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