1. Peak Inspiratory and Expiratory Flow Meter
Team:
Andrew Eley, Sarah Offutt, Darshan Patel,
Eric Bader
BME 200/300
October 14, 2005

2. Client: Christopher G. Green, MD Pediatric Pulmonology UW Hospital Advisor: John Webster, Ph.D. Dept. of Biomedical Engineering University of Wisconsin

3. Overview Problem Statement Background Proposed Designs Future Work
Questions

4. Problem Statement
To make an inspiratory and expiratory peak flow meter
Improve diagnoses of Vocal Chord Dysfunction
Easy to use
Must be durable
Easy to Carry
Inexpensive

5. Background Asthma Vocal Chord Dysfunction Exhaling, lower airways
Caused by external triggers
Treated with medications
Vocal Chord Dysfunction
Inhaling, upper airways
Possible causes, exercise, nervousness
Treated with speech therapy

6. Background…Continued
Expiratory Flow Meters, use to monitor asthma
Exhaling force moves plunger
Portable
Measured in Liters/Second
Breathing Zones
Inspiratory Flow Meter

7. Alt. Design 1: Double Barrel
How it works
two springs/plungers
Pushes indicator arrow
Seals
Independent scales

8. Alt. Design 1: Double Barrel
Advantages
Combination expiratory-inspiratory flow meter
Simple device using springs and disks
No use of electricity
Ease of cleaning
Easy to use
Disadvantages
Bulky
Faster wear of parts
Failure of seals

9. Alt. Design 2: Taser How it works Drag plate Strain gauge
bidirectional
Strain gauge
Digital display

10. Alt. Design 2: Taser Advantages Disadvantages Compact design
Easy to read display
Accurate result
Easy to use
Disadvantages
Complex device
Electrical components
Heavy
High cost
Difficulty cleaning

11. Proposed Design: Sniper
How it works
Dual Action
Inhaling/Exhaling
Pressure difference pushes plunger
Indicator Arrow

12. Proposed Design: Sniper
Advantages
Combination expiratory-inspiratory flow meter
Simple device using springs and disks
No use of electricity
Safe – clear plastic
Ease of cleaning
Easy to use
Disadvantages
Little Longer in length

13. Design Matrix Design Matrix 1 = Poor & 5 = Excellent Design
Double Barrel
Taser
Sniper
(Proposed)
Cost 4 1 5
Portability
(size, weight) 3 2
Reliability
Ease of Manufacturing
Ease of Use
Complexity of Design
Client Preference
Totals 24 15 29

14. Future Work Finalize dimensions and materials Build Final Prototype
Test Prototype
Calibration

15. Questions?