Slide 1OverviewBackground InformationSlide 4Slide 5Slide 6Client RequirementsDesign MatrixFastening MechanismGripping LiningBase MaterialMethod of AdjustmentJointsFuture WorkSlide 15Questions?ReferencesAdjustable Wave Tube Stand for Acoustic Reflection TechniqueTeam Leader – Ryan CarrollCommunicator – Jeremy GlynnBWIG – Andrew BremerBSAC – Ben EngelClient – Erin Douglas CCC/SLPAdvisor – Professor Willis Tompkins Ph.DOverview•Background Information•Proposal/Client Requirements•Design Alternatives by Component•Design Matrices•Future Work•QuestionsBackground Information•Acoustic Reflection Technique–Non-invasive assessment of vocal tract anatomy–Subjects exhale through wave tube–Microphone captures acoustic reflections of airway–System constructs plots of vocal tract area and distance from lipsBackground Information•Why study the vocal tract?–To track anatomical changes during growth–To study speech changes/impediments–To study functional abnormalities of the pharynx–To better understand sleep disorders associated with the VT such as sleep apneaBackground Information•Goal of current study:–Compare accuracy of measurements from ART to measurements from imaging•Why not just use imaging?–Too expensive–Limits the range of subjects–Cannot be transported to the home (Durtschi, 2007)Background Information•Major problem with the current protocol•Wave tube device is not in a fixed position•Changes in wave tube position cause:–Change in VT volumes–Problems with repeatability between testsClient Requirements•Standard Alignment•Large Range of Adjustment•Fine Adjustability •Easily Disinfected•Portability•Non-invasive to patientDesign MatrixFeature IdeasInterfaceFastening MechanismVelcro Rubber Strap Latch Gripping Lining Silicone Foam RubberBase Material HDPE Delryn Aluminum LDPEStandMethod of adjustmentPerforated tube /pinTwist and LockGear and trackJoints Rigid AdjustableFastening MechanismCriteria Weight Velcro Rubber Strap LatchSecurity of Wave Tube.4 7 9 5Ease of Disinfecting.3 2 8 9Ease of Manufacturing .2 8 8 3Cost .1 9 8 5Total 1.0 5.9 8.4 5.8Gripping LiningCriteria Weight Silicone Foam RubberEase of Disinfecting.35 6 1 9Relative Tackiness .25 9 6 7Durability .25 6 2 9Cost .15 5 8 7Total 1.0 6.6 3.55 8.2Base MaterialCriteria Weight HDPE Delrin Aluminum LDPEWeight .45 8 5 3 8Ease/Quality of Manufacturing.25 6 8 8 4Cost .3 8 2 2 9Total 1.0 7.5 6.15 3.95 7.3Criteria Weight Perforated tube / pinTwist and Lock Gear and trackRepeatability .3 10 8 6Collapsibility .2 8 9 7Ease of Use .2 6 8 8Fineness of Adjustment.3 2 10 8Total 1.0 6.4 8.8 7.2Method of AdjustmentCriteria Weight Rigid AdjustableEase of Use .2 9 6Portability .4 3 9Repeatability .4 9 8Total 1.0 6.6 8.0JointsFuture Work•Obtain parts for interface construction•HDPE •Rubber gripping interface•Rubber Straps• Build working prototype •Machine base out of HDPE•Assemble all other partsFuture Work•Modify Samson MB1 Mini Boom Stand•Place markings on stand for ease of use and reduction of variables between patients and studies•Replace interface with one compatible with wave tube• Patient testing and analysishttp://www.samsontech.com/products/relatedDocs/MB1.jpgQuestions?References•Durtschi, R. (2007, June, 22). A Comparison of Measurements: Acoustic Reflective Technique vs. Medical Imaging. Retrieved October 13, 2007.•Hoffstein, V. (1991).The acoustic reflection technique for the non-invasive assesment of upper airway area . European Respiratory Journal. 4, 602-611.•Kamal, I. (2004).Test-retest validity of acoustic pharyngometry. Otolaryngology - Head and Neck Surgery. 130 - 2, 223-228.•Rubinstein, I (1987).Effect of mouthpiece, noseclips, and head position on airway measured by acoustic reflection technique. Journal of Applied Physiology. 63-4, 1469-1474.• Samson Audio. Retrieved October 18, 2007, from MB1 Mini Boom Stand Web site: http://www.samsontech.com/products/productpage.cfm?prodID=1681•Rubber and Foam Film. Retrieved October 11, 2007, from McMaster Web site: www.mcmaster.com•Plastic Sheets, Bars, Strips and Cubes. Retrieved October 11, 2007 from McMaster Web site:
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