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 MembersErik Yusko – Leader Tony Wampole – BSAC Anna Moeller- BSACJon Sass- BWIGDanielle Ebben – CommunicationsClientTass Dueland- DVMRay Vanderby- ProfessorAdvisorProfessor 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.BackgroundIntramedullary nails are used to repair long bone fracturesNails are inserted into the marrow of the bone and secured into place by screws on the proximal and distal parts of the fractureMost effective for clean fracturesBackgroundExtension piece attached to nailNail inserted in boneJig attached to extension pieceScrews put in place by using jig guidesMotivationPoor alignment of jig guide with nail screw holes results in complications with inserting screwsDistal screws miss more often4% of screws miss the targetNeed to strengthen extension piece/nail interfaceClient/Design RequirementsImplement in current surgical procedureMaintain nail integrityConsist of only biocompatible materialsEasily sterilizedReduce distal hole failure rateDesign 1: Extra BarsDecrease the width of threaded screwAdd 2 rods that go into the nailNew rods perpendicular to screw holesProximal Screw HolesDesign 1: Pros and ConsPros:Moment arm perpendicular to jig reducedDoesn’t allow rotationStill easy to useCons:Screw is smallerLikely allow more movement parallel to jigMay effect integrity of rodDesign 2: Conical ConnectionForce distribution increasedKey prevent rotation around long axisTwo areas were forces are now opposing motionDesign 2: Pros and ConsPros:Easily implemented into surgical procedureLeaves most components unalteredMoments in all directions should be reducedCons:May be difficult to machineDesign 3: Double-Sided ScrewJig has conical holeTop extension screws into middle and also into nailMiddle has hollow center to allow double sided screw throughNut attaches middle to nailH head and notch align holesConceptual; not to scaleDesign 3: Pros and Cons Pros:Will reduce movement around top jointStill align holesStability of nail not reducedCons:Increased difficulty with more piecesMight not reduce movement in second jointLengthens 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 WorkDecide on Final DesignDetermine Design ParametersBuild & Test PrototypeReferencesRassman, 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=2995Youngerman-Cole, Sydney. Repair of the Vaginal wall (Vaginal Vault Prolapse. [Online] Retrieved October 7,
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