Adjustable Wave Tube Stand for Acoustic Reflection Technique

1. Adjustable Wave Tube Stand for Acoustic Reflection Technique Team Leader – Ryan Carroll Communicator – Jeremy Glynn BWIG – Andrew Bremer BSAC – Ben Engel Client – Erin Douglas CCC/SLP Advisor – Professor Willis Tompkins Ph.D

2. Overview • Background Information • Proposal/Client Requirements • Design Alternatives by Component • Design Matrices • Future Work • Questions

3. Background 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 lips

4. Background 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 apnea

5. Background 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)

6. 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 tests

7. Client Requirements • Standard Alignment • Large Range of Adjustment • Fine Adjustability • Easily Disinfected • Portability • Non-invasive to patient

8. Design Matrix

9. Fastening Mechanism

10. Gripping Lining

11. Base Material

12. Method of Adjustment

13. Joints

14. Future Work • Obtain parts for interface construction • HDPE • Rubber gripping interface • Rubber Straps • Build working prototype • Machine base out of HDPE • Assemble all other parts

15. Future 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 analysis http://www.samsontech.com/products/relatedDocs/MB1.jpg

16. Questions?

17. 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: www.mcmaster.com