Transcript (Fall 2007) 2855 kb Thursday, April 24, 2008

GPS-ENABLED ASTHMA INHALER
Michael Alexander | Samantha Bergh | Mollie Lange | Peter Ma
BME 400
October 19, 2007
PROJECT SUPPORTERS
Client: David Van Sickle
• PhD, Medical Anthropology
• Specific interest in asthma and allergy
• Epidemic Intelligence Service officer for Centers
for Disease Control
• Special projects with National Asthma Control
Program
• Currently at UW as a Health and Society Scholar
Advisor: Professor Mitch Tyler
• Biomedical Engineering
• Orthopedics and Rehabilitation
• UW-CREATe
INTELLECTUAL PROPERTY STATEMENT
All information provided by individuals or Design
Project Groups during this, or subsequent
presentations, is the property of the researchers
presenting this information.
CONTENT
Problem Statement
Background
Motivation
Design Constraints
Design Solution
Current Progress
Future Work
References
PROBLEM STATEMENT
• Create a device capable of:
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Tracking the usage of asthma inhalers
Transferring between medication dispensers
Noting time, date, and location of exacerbations
Wireless transmission of subject data to database
• Fall 2007-Spring 2008
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Improve upon previous design
Create 4-5 prototypes
Gain approval to begin clinical trials
Clinical trials with asthma patients
BACKGROUND
• Asthma
– Chronic respiratory disease in which airways are
blocked due to allergy or inflammation
– Over 20 million Americans currently suffer from asthma
• Global Positioning System (GPS)
– First developed for military
– Widely used in communication, recreation, and safety
– Uses signal transmission time to triangulate position
MOTIVATION
• Tracking of allergy/asthma symptoms
– Local population health dynamics
– Notification at time that symptoms occur
– Currently no product on market
• Implications
– Baseline expectations for certain areas
– Outbreak control
– Pollution and allergen warning system
DESIGN SOLUTION
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Must meet FDA/IRB approval for use
Secure attachment for peripherals
Transferable between inhalers
Wireless
Battery powered
GPS accurate to 15ft
Low incidence of false positives
DESIGN SOLUTION
Button
pushed
Microchip
snoozes
nternet Explorer Browser.lnk
Server formats
coordinates and
displays them on
map
Chip powers
on and runs
program
Program
obtains GPS
coordinates
Send HTTP
request to web
server
CURRENT PROGRESS: SPRING 2007
• Proof of concept prototype and Google Maps-based
web implementation
• Problems:
– No Python interpreter
– Laptop sent commands
– Not wireless – battery/power regulation issues
Custom mapping software with SQL database search
function, with much thanks to the UW Cartography Lab.
CURRENT PROGRESS: FALL 2007
– Python programming
• Programs written
• Python interpreter in chip is unreliable
• Solution: External microcontroller
– Wireless implementation
• Power system built:
– Lithium ion battery, capacitor, and protection Zener diode
– Circuit board schematic created for printing PCB board
– Purchased waterproof housing for encasing device
• Currently, seeking smaller alternatives
– Smaller tactile push button
ESTIMATED COSTS
• Estimated cost of solution
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GM862-GPS
Microcontroller
SIM card and service
Circuit Boards
Momentary button
Battery
Housing
TOTAL
$183.95
$9.95
$39.95
$29.95
$19.95
$14.95
$14.95
$312.65
Actual prototype cost more than this, but buying in bulk may
eventually cut that price dramatically.
FUTURE WORK
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Use external microcontroller
Study power and current requirements
Test battery life
Research rechargeable battery circuits
Housing & button options
Circuit board printing
Creation of 4-5 additional prototypes
Clinical Testing
REFERENCES
Asthma and Allergy Foundation of America
http://www.aafa.org
American Academy of Allergy Asthma and
Immunology
http://www.aaaai.org
How Stuff Works: GPS
http://www.howstuffworks.com/gps.htm
QUESTIONS?
Thank you for your time!
Any questions?
TESTING PROTOCOLS
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Basic Function Analysis
Accuracy of Coordinate Retrieval
Accuracy of Dosage Detection
Program Execution
Power Regulation Over Time
Durability
Ease of Use
Multiple Coordinate Acceptance of Website
Patient Safety Analysis