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BME 272-273 Design Project: Assessment and Redesign of Mister

BME 272-273 Design Project: Assessment and Redesign of Mister. Team Members: Craig Hewitt Chaz Hogancamp Advisors: Dr. Ed Stone Dr. Paul King. Problem Overview. 2. Humidified air needed around normal air pathways for singers in arid environments

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BME 272-273 Design Project: Assessment and Redesign of Mister

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  1. BME 272-273 Design Project:Assessment and Redesign of Mister Team Members: Craig Hewitt Chaz Hogancamp Advisors: Dr. Ed Stone Dr. Paul King

  2. Problem Overview 2 • Humidified air needed around normal air pathways for singers in arid environments • Singers must intake air through mouth instead of nose • Mucus membrane in nose humidifies air • Mister output to be placed in/around microphone stand to provide humidified air to breath

  3. Initial Project Goals and Issues • Reduce output flow diameter to ~2 cm • Problems with plan: • Flow backup causes condensation drip • Condensation corrodes fan and circuit board • Difficult to get slow enough flow out of smaller diameter tube

  4. Revised Project Goals • Redesign mister to smaller scale • Make humidified air produced by mister comfortable to breathe by users • Make mister more cost efficient and easier to use

  5. Optimal humidity range for breathing comfort: 41-58% Assume ~0.5 L/breath and 12 breaths/minute At this rate, humidified air required is 0.211ft3/minute Vocalist tidal volume = 0.75 L/breath Vocalist take 8-10 breaths/minute Required humidified air = 0.264 ft3/minute Normal Human vs. Vocalist Breathing 7

  6. Contraindications with low humidity levels(0-40%) 5 • Comfort (dry skin) • Stress on nasal-pharynx and trachea • Lowers temperature and moisture in these organs • Excessive dehydration • Increase viscosity of bronchial mucous • Reduces ability to fight microorganisms that cause illness

  7. Ailments of vocalists • Aphonia-no voice • Dysphagia-difficulty swallowing • Dysphonia-hoarseness, abnormal voice • Dystonia-disorder of muscle tonicity • Dysresonance-disorder of phonation caused by abnormal resonance

  8. Current mister specifications 1 • Maximum mister volume = 5L of H2O • Tank of 5 L allows for 3 hours of operation • Mister velocity =100-120 ft/min • Output of standard 3” tube is 4 ft3/min • At this rate and reduced output, human breathing will be supported with sufficient humidified air

  9. Redesigned Mister • Output tube diameter < 2 cm • Fan velocity = 80 – 100 ft/min • Maximum tank volume = 3 L • Allowable run time with 3 L = 2 hours • Output volume per time = 0.337 ft3/min

  10. Humidification by Mister • Air intake and output controlled by internal fan • Humidification created by megasonic drive system using a piezoelectric transducer(1.65MHz) • Able to deliver variable flow rates and humidity levels

  11. Mister Flow Chart

  12. Mister vs. Food Stamps: Who should buy the mister? 3

  13. Financial Considerations • Prototype cost: $12,000 • Desired unit cost: $2,000 • Prototype cost is high due to unnecessarily high quality of parts

  14. Market Feasibility • Potential market is all of Las Vegas, Reno, etc. performers • Would be purchased by performer • Minimal estimated market size 15,000 performers • Minimal total market value: $2,000 x 15,000 = $30,000,000

  15. Other potential uses • Hospital room humidity regulation • Burn victim wards • Post pharynx surgery • Others possible through collaboration with Dr. Ed Stone/Vanderbilt Ear Nose and Throat Center

  16. References • Jim Campbell with Clean Air Solutions • Dr. Stone with Vanderbilt’s Ear Nose Throat Center • http://www.womeninmusic.com/careers.htm • http://www.weather.com/outlook/homeandgarden/home • http://www.ciesin.org/docs/001-338/001-338.html • http://www.bgsm.edu/voice/glossary.html • Sherwood, Lauralee; Human Physiology From Cells to Systems Brooks/Cole 2001

  17. Project Progress • Assessment of mister performance • Contact with Jim Campbell of Clean Air Solutions • Created ideas for improvement • Focused project goals • Idea implementation • Testing of redesign

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