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UW-Madison BME 200 - Redesigning Intramedullary Nail

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Redesigning Intramedullary Nail: to improve success rateTissue Engineering Design TeamProblem StatementBackgroundSlide 5MotivationClient/Design RequirementsDesign 1: Extra BarsDesign 1: Pros and ConsDesign 2: Conical ConnectionDesign 2: Pros and ConsDesign 3: Double-Sided ScrewDesign 3: Pros and ConsDesign MatrixFuture WorkReferencesRedesigning Intramedullary Nail: to improve success rateOctober 14, 2005Tissue Engineering Design TeamTeam MembersErik Yusko – Leader Tony Wampole – BSAC Anna Moeller- BSACJon Sass- BWIGDanielle Ebben – CommunicationsClientTass Dueland- DVMRay Vanderby- ProfessorAdvisorProfessor William MurphyProblem StatementTo improve the intramedullary nail in an effort to decrease misalignments that lead to the inability to secure the nail to the bone.BackgroundIntramedullary nails are used to repair long bone fracturesNails are inserted into the marrow of the bone and secured into place by screws on the proximal and distal parts of the fractureMost effective for clean fracturesBackgroundExtension piece attached to nailNail inserted in boneJig attached to extension pieceScrews put in place by using jig guidesMotivationPoor alignment of jig guide with nail screw holes results in complications with inserting screwsDistal screws miss more often4% of screws miss the targetNeed to strengthen extension piece/nail interfaceClient/Design RequirementsImplement in current surgical procedureMaintain nail integrityConsist of only biocompatible materialsEasily sterilizedReduce distal hole failure rateDesign 1: Extra BarsDecrease the width of threaded screwAdd 2 rods that go into the nailNew rods perpendicular to screw holesProximal Screw HolesDesign 1: Pros and ConsPros:Moment arm perpendicular to jig reducedDoesn’t allow rotationStill easy to useCons:Screw is smallerLikely allow more movement parallel to jigMay effect integrity of rodDesign 2: Conical ConnectionForce distribution increasedKey prevent rotation around long axisTwo areas were forces are now opposing motionDesign 2: Pros and ConsPros:Easily implemented into surgical procedureLeaves most components unalteredMoments in all directions should be reducedCons:May be difficult to machineDesign 3: Double-Sided ScrewJig has conical holeTop extension screws into middle and also into nailMiddle has hollow center to allow double sided screw throughNut attaches middle to nailH head and notch align holesConceptual; not to scaleDesign 3: Pros and Cons Pros:Will reduce movement around top jointStill align holesStability of nail not reducedCons:Increased difficulty with more piecesMight not reduce movement in second jointLengthens amount of nail left out of boneDesign MatrixDesign Simplicity IntegrationintoprocessCleaning Cost PotentialEffective-nessTOTAL(1-5) (1-10) (1-5) (1-5) (1-10) (5-35)Extra Bars 4 9 5 3 7 28ConicalConnection 3 8 5 3 8 27Double-sidedScrew4 7 5 2 7 25Future WorkDecide on Final DesignDetermine Design ParametersBuild & Test PrototypeReferencesRassman, W., Bernstein, R., McClellan, R., Jones, R., Worton, E., Uyttendaele, H. 2002. Follicular Unit Extraction: Minimally Invasive Surgery for Hair Transplantation [Online] http://www.newhair.com/resources/p_2002_fue.asp .Willis, B. 2001 Hair! [Online] http://www.wcsscience.com/hair/page.html .[Company] Chemical Treatment, Internal Document, Rev. B.Mattmiller, Brian. (1998, April). UW Biochemist solves riddle of collagenstability. Retrieved October 4, 2004, University of Wisconsin,http://www.news.wisc.edu/releases/print.php?id=2995Youngerman-Cole, Sydney. Repair of the Vaginal wall (Vaginal Vault Prolapse. [Online] Retrieved October 7,


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