Functional Seating Design for Lumbar Puncture Procedure Team Amanda Feest Chelsea Wanta Lee Linstroth Malini Soundarrajan BME 200 300 October 20 2006 Client Cynthia M Carlsson M D M S UW Medical School Advisor Kristyn Masters Professor Ph D UW College of Engineering Overview Problem Statement Background Design Requirements Proposed Designs Design Matrix Future Work Questions Problem Statement To design a specialized support system to maximize patient comfort and spinal curvature during lumbar puncture procedures Background Analyzes spinal fluid of people at risk for Alzheimer s disease to study changes occurring in the brain Lumbar Puncture Basic Procedure Spinal fluid is collected by inserting a needle into lower back Collection is easier if the patient curves their back opening up the space between the lumbar backbones http apps med buffalo edu procedures lumbarpuncture asp p 13 Existing equipment Currently there is no device specifically designed for this procedure In the past massage chairs have been used but they do not maximize spinal curvature http www neurology org cgi content full 58 12 1859 cookietest yes Current Set up Current Position Problems Uncomfortable Does not optimize spinal curvature Design Requirements Proper positioning of the back Maximize patient comfort Must cost less than 500 to produce Needs to be adjustable for varying patient heights Must be able to be used in conjunction with a hospital bed Must be portable and fit in hospital rooms Proposed Design 1 One Piece Unit Description Head rest foot rest arm rest attached to central support column All adjustable locking wheels for transportation 43 25 Wheels Proposed Design 1 Pros Easy to transport Pieces will not get separated Equal weight distribution for better stability Cons Difficult to adjust for different leg lengths Many moving parts Proposed Design 2 Two Piece Stand Alone Unit Description Separate foot rest and stand with head and arm support Adjustable heights for all components Stand with wheels Foot rest attaches to base Proposed Design 2 Pros Adjustable for different leg lengths Provides optimal curvature of the spine Adjustable angle for foot rest Cons Transportation difficulties Proposed Design 3 Two Piece Table top Unit Description Separate heightadjustable foot rest Arm rest and head rest will attach to the bedside table currently in the rooms Proposed Design 3 Pros Less expensive Utilizes existing equipment Smaller and easier to store Cons Not sturdy since the table does not have locking wheels Less air flow Difficult to transport Foot rest movement would be limited Design Matrix One piece unit Two piece stand alone unit Two piece table attachment Comfort 10 7 7 7 Stability 10 9 9 5 Curvature of Spine 10 7 9 6 Ease of manufacturing 10 5 9 7 Adjustability 10 7 9 3 Portability 5 5 3 3 Cost 5 4 4 5 Total 60 44 50 36 Future Work Develop prototype Select and order materials Manufacture the device Test the prototype and make necessary adjustments Questions References http apps med buffalo edu procedures lumb arpuncture asp p 13 Cynthia M Carlsson M D M S
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