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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

Ventilation Monitor

Padraic Casserly, Andrew Dias, Joey Labuz, Joel Webb


Problem statement
Problem Statement

  • Design a ventilation monitor that can:

    • Be worn on a firefighter’s chest

    • Monitor respiration rate

    • Wirelessly transmit data

    • Save lives


Background
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


Current devices
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


Design constraints
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



Design 1 inductive plethysmographer with colpitts oscillator

f  L-1/2

Time varying frequency converted into voltage

Design 1: Inductive Plethysmographer with Colpitts Oscillator


Design 2 inductance plethysmographer with low pass filter

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


Design 3 lvdt
Design 3: LVDT

  • Linear Variable Differential Transformer

  • Reliable and Accurate

  • Too Costly



Future work
Future Work

  • Order materials

  • Build prototype of final design

  • Test prototype

  • Further investigate transmission technology


References
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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