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Ventilation Monitor

Ventilation Monitor. Padraic Casserly, Andrew Dias, Joey Labuz, Joel Webb. Problem Statement. Design a ventilation monitor that can: Be worn on a firefighter’s chest Monitor respiration rate Wirelessly transmit data Save lives. Background. Need for device

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Ventilation Monitor

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  1. Ventilation Monitor Padraic Casserly, Andrew Dias, Joey Labuz, Joel Webb

  2. Problem Statement • Design a ventilation monitor that can: • Be worn on a firefighter’s chest • Monitor respiration rate • Wirelessly transmit data • Save lives

  3. Background • Need for device • Asphyxiation is the third leading cause of firefighter death • 123 asphyxiation deaths in last decade • Inductance Plethysmography • Used to measure change in lung volume • L = NΦ / I

  4. Current Devices http://www.prweb.com/prfiles/2007/11/01/225264/Photo2.jpg • Vivometrics Vivoresponder • $2500-$8000 • MSA TxR ICM System • $1800 base price • Ambulatory Monitoring Inc. • $70 • MVAP • $260 Ambulatory Monitoring Inc. Catalog

  5. Design Constraints • Send signal indicating firefighter respiration • Fits chest sizes 30” to 50” • Protected from moisture • Able to withstand temperatures of 110° F • Comfortable • Less than one pound

  6. Chest Strap Design 4.00”

  7. f  L-1/2 Time varying frequency converted into voltage Design 1: Inductive Plethysmographer with Colpitts Oscillator

  8. Chest strap functions as inductor (L) Vout = VR fc R/L, so choose R and L such that frequency is very close to fc Design 2: Inductance Plethysmographer with Low-pass Filter

  9. Design 3: LVDT • Linear Variable Differential Transformer • Reliable and Accurate • Too Costly

  10. Design Matrix

  11. Future Work • Order materials • Build prototype of final design • Test prototype • Further investigate transmission technology

  12. References Cohen et al. 1994. “Design of an Inductive Plethysmograph for Ventilation Measurement.” Physiological Measurement. Vol 15, No 2, pp 217-229. Cohen, Neal H and Shaughnessy Thomas E. 1996. “Respiratory Monitoring.” Baillière's Clinical Anaesthesiology, Vol. 10, No. 1, pp 17-30. FireSite. “Firefighters in peril: monitoring heart rate, breathing, and movement.” Research Proposal H-SB07.1-005, #0711215. Hett, D.A and Jonas, M.M. 2004. “Non-invasive Cardiac Output Monitoring.” Intensive and Critical Care Nursing. Vol. 20, No. 2, pp 103-108. ScienceDirect. International Firefighting News. 2008. “Daily Firefighting News and Photos.” <http://firefightingnews.com/wallpapers.cfm> Macro Sensors. 2003. “LVDT Basics.” <http://www.macrosensors.com/lvdt_macro_sensors/lvdt_tutorial/lvdt_primer.pdf> Omega. 2007. “LVDT: Economical AC Displacement Transducers.” <http://www.omega.com/pptst/LD200.html> OpenSystems Publishing. 2007. “Multichannel LVDT Signal Conditioner Supports Position Measurement Applications » Rosenthal, Justin. “Inductance Plethysmography.” <http://www.smallformfactors.com/news/db/?6782> U.S. Fire Administration. 2007. “Firefighter Fatalities in the United States in 2006.” <http://www.usfa.dhs.gov/downloads/pdf/publications/ff_fat06.pdf> Webster, John G. 2004. Bioinstrumentation. Weinberg G.M. and Webster J.G. 1998. “Measuring Human Ventilation for Apnoea Detection Using an Optical Encoder.” Physiological Measurement. Vol 19, No. 3, pp 441-46. Williams et al. 1994. Inductive Plethysmographic Transducers and Electronic Circuitry Therefor. US Patent, 5,331,968.

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