1. GPS-Enabled Inhaler Final Design Cost of Materials Abstract
Michael Alexander, Joseph Cabelka, Mollie Lange, Peter Ma
Advisor: Mitch Tyler, M.S. Client: David Van Sickle, Ph.D.
Final Design
Cost of Materials
Abstract
Components
Asthma is a disease of growing public health importance and is unique in that inhalers and the medications they supply are often used at the exact time and location of symptom onset. By monitoring these factors in real-time instead of relying on patient documentation, patterns in symptoms can be deciphered and could help to identify common risk factors in populations. The goal of this project is to create a device that can store and transmit the time, date, and location of medication use by utilizing Global Positioning System (GPS) technology.
Core
Quantity
Unit Price
Sub-total
GM862 Module 1
183.95
120
147.16
17,659.20
GM862 SMD Molex Connector
5.95
4.76
571.20
GSM Antenna (SMA)
7.95
6.36
763.20
GPS Antenna (SMA)
14.95
GPS Antenna (MCX)
10.36
1,243.20
Interface Cable MMCX to SMA
8.95
7.16
859.20
221.75
21,096.00
PCB Fabrication and Assembly
PCB Assembly
88.83
6.905
828.60
PCB Fab
19.75
7.51
901.20
Other electronic components (estimated) 20
500.00
128.58
2,229.80
Power and storage
FSR
6.6
5.28
633.60
The Smart Charger
13.95
11.16
1,339.20
Li-Ion V 750mAh
3.39
2.37
284.40
Hammond Polystyrene Enclosure
3.35
2.61
313.20
27.29
2,570.40
UNITS PRODUCED
SUBTOTAL OVERALL
377.62
25,896.20
TOTAL PER UNIT
215.80
Problem Definition
Problem Statement:
Develop an attachment for an asthma inhaler which has the ability to record date, time, and location of asthma exacerbations and to display them on a map.
Motivation:
Tracking allergy/asthma symptoms is important for:
- Outbreak control
- General health studies in local or general areas
Surveillance to this point has been limited to severe episodes that lead to hospital visits or patient recount
Current Devices:
Currently there are no competing products on the market, although GlaxoSmithKline holds a patent (6,958,691) for a similar idea that has not been fabricated or tested.
sub procedure getlocation
resp="GPSACP"
got_loc = checklocation
if got_loc = 1 then
longitude = "good loc"
if got_loc <> 0 then
sendlocation
Delay_ms(1000)
Testing
Future Work
Design Criteria
Must meet FDA standards for use
Secure attachment for peripherals
Withstand normal wear
- Waterproof, does not damage on impact, etc
Wireless with battery power; rechargeable
Optimally reusable between inhalers/medications
Accurate GPS coordinates : within 20 ft
Cost less than $300 per unit
Additional Miniaturization
and program expansion
Clinical Testing
CDC Study
Mass production
Patent Disclosure
Project Schedule
SEMESTER 1: PROOF OF CONCEPT
SEMESTER 2: FABRICATION
SEMESTER 3: TESTING
IRB approval for clinical testing
Add intelligence to microcontroller
Full integration with asthmap.org web software
Testing
Prototypes
FUTURE:
CDC study with 120 more devices
Miniaturize more if technology exists
Further miniaturization might be possible with the proper tools and equipment.
Prototype Iterations
Prototype #1: Large battery, Always-on program
Prototype #2: Small battery, Always-on program
Prototype #3: Large battery, Sleep program
Prototype #4: Small battery, Sleep program
Results
Average battery life for the Always-on program is eight hours for the small battery.
Using the Sleep program and small battery, the unit needs to be charged once weekly (assuming normal use of 4-5 exascerbations daily)
Always-on program boosts accuracy but does not speed up coordinate transmission.
Acknowledgments
The Team would like to thank Professor Mitch Tyler, Dr. David Van Sickle, the UW Cartography Lab, Amit Nimunkar, and Dave Markovich at the Medical Electronics Lab for their support and assistance, without which this project would not have been possible.