Functional Seating Design for Lumbar Puncture ProcedureOverviewProblem StatementBackgroundExisting equipmentCurrent Set-upDesign RequirementsProposed Design #1 One Piece UnitProposed Design #1Proposed Design #2 Two Piece Stand Alone UnitProposed Design #2Proposed Design #3 Two Piece Table – top UnitProposed Design #3Design MatrixFuture WorkQuestions?ReferencesFunctional Seating Design for Lumbar Puncture ProcedureTeam: Amanda Feest, Chelsea Wanta, Lee Linstroth, Malini SoundarrajanBME 200/300October 20, 2006Client: Cynthia M. Carlsson, M.D./M.S. UW Medical School Advisor: Kristyn Masters, Professor, Ph.D. UW College of EngineeringOverviewProblem StatementBackgroundDesign RequirementsProposed DesignsDesign MatrixFuture WorkQuestionsProblem StatementTo design a specialized support system to maximize patient comfort and spinal curvature during lumbar puncture proceduresAnalyzes spinal fluid of people at risk for Alzheimer’s disease to study changes occurring in the brainLumbar Puncture Basic ProcedureSpinal fluid is collected by inserting a needle into lower backCollection is easier if the patient curves their back, opening up the space between the lumbar backbonesBackgroundhttp://apps.med.buffalo.edu/procedures/lumbarpuncture.asp?p=13Existing equipmentCurrently, there is no device specifically designed for this procedureIn the past, massage chairs have been used but they do not maximize spinal curvaturehttp://www.neurology.org/cgi/content/full/58/12/1859?cookietest=yesCurrent Set-up•Current Position Problems •Uncomfortable •Does not optimize spinal curvatureDesign RequirementsProper positioning of the backMaximize patient comfort Must cost less than $500 to produceNeeds to be adjustable for varying patient heightsMust be able to be used in conjunction with a hospital bedMust be portable and fit in hospital roomsProposed Design #1 One Piece UnitDescriptionHead rest, foot rest, arm rest attached to central support columnAll adjustablelocking wheels for transportation43“Wheels25”Proposed Design #1ProsEasy to transportPieces will not get separated Equal weight distribution for better stabilityConsDifficult to adjust for different leg lengthsMany moving partsProposed Design #2 Two Piece Stand Alone UnitDescriptionSeparate foot rest and stand with head and arm supportAdjustable heights for all componentsStand with wheelsFoot rest attaches to baseProposed Design #2ProsAdjustable for different leg lengthsProvides optimal curvature of the spineAdjustable angle for foot restConsTransportation difficultiesProposed Design #3 Two Piece Table – top UnitDescriptionSeparate height-adjustable foot restArm rest and head rest will attach to the bedside table currently in the roomsProposed Design #3ProsLess expensiveUtilizes existing equipmentSmaller and easier to storeConsNot sturdy since the table does not have locking wheelsLess air flowDifficult to transportFoot rest movement would be limitedDesign MatrixOne piece unitTwo piece stand-alone unitTwo piece table attachmentComfort (10) 7 7 7Stability (10) 9 9 5Curvature of Spine (10)7 9 6Ease of manufacturing (10)5 9 7Adjustability (10) 7 9 3Portability (5) 5 3 3Cost (5) 4 4 5Total (60) 44 50 36Future WorkDevelop prototypeSelect and order materialsManufacture the deviceTest the prototype and make necessary adjustmentsQuestions?Referenceshttp://apps.med.buffalo.edu/procedures/lumbarpuncture.asp?p=13Cynthia M. Carlsson, M.D.
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