april 20, 2006copyright © 2006, vedo medico1. april 20, 2006copyright © 2006, vedo medico2 edema...
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April 20, 2006 Copyright © 2006, Vedo Medico 2
Edema Measurement System (EMS)
Presented by Vedo Medico teamAli Khan
Sepehr MoghareiArthur Arash Papian Gorji
Babak ShafieiBranko Zdravkovic
April 20, 2006 Copyright © 2006, Vedo Medico 3
Agenda
• Introduction• Purpose• Product Overview• Product Design• Results and Analysis • Challenges • Timeline and Budget• Conclusion• Questions• Demonstration
April 20, 2006 Copyright © 2006, Vedo Medico 4
Introduction
• Vedo Medico’s Vision– “Our business is life itself”
• Team:– Ali Khan – Embedded Software
– Sepehr Mogharei – Hardware
– Arthur Papian-Gorji – Communication
– Babak Shafiei – User Interface Design
– Branko Zdravkovic – Host Software
April 20, 2006 Copyright © 2006, Vedo Medico 5
Purpose
• Problem: – Swelling in limbs could be a sign of heart failure, kidney
failure or other serious medical conditions
• Current Solutions: – Costly, Unreliable, Bulky, Slow– Circumference measurements
• Our Solution: – Edema Measurement System (EMS) – Volume measurements
Leg-O-Meters
Pero-System
April 20, 2006 Copyright © 2006, Vedo Medico 6
Product Overview
• What is Edema Measurement System (EMS) ?– Highly accurate and cost-effective device– Simple, user-friendly device that measures patient’s
limb volume– Provides connectivity with PC for further measurement
analysis– Portable design
April 20, 2006 Copyright © 2006, Vedo Medico 7
Product Overview
• Design Approaches– Digital image processing– Digital measuring using position sensors– Circumference measurement by resistance
• Final Design– Volume measurement by pressure sensor
April 20, 2006 Copyright © 2006, Vedo Medico 14
Final Design
Xi = Base Line pressure
Xf = Final Pressure
Volume of Leg = Volume of Enclosure – Volume of Bladder (VB)
Volume of Leg = Constant – VR VB= nrt/(pressure of the bladder)
PV = nrt V x*(VR) - C
V Pressure In the bladder
Linear relation
April 20, 2006 Copyright © 2006, Vedo Medico 17
Results & Analysis
• Preliminary Experiments– Sealed Bottles (Fixed
Volume)– Linear Relationship– Added water for more
volumesBottle with Volume Increments using Water
y = 0.0023907x - 8.8250238
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
3000 3500 4000 4500 5000 5500
Measurement
Vo
lum
e (L
)
Various Bottles
y = 0.0082x - 0.3165
0
1
2
3
4
5
0 100 200 300 400 500 600
Measurement
Vol
ume
(L)
April 20, 2006 Copyright © 2006, Vedo Medico 18
Results & Analysis
• Enclosure Experiments– Objects with known
volume in place of leg– Problems
• Flex when pressurized• Does not compress as
leg does
– Experimented with Measurement Parameters
Pressure vs Volume for Enclosure(Final Procedure)
y = -49.631x + 27160
0
200
400
600
800
1000
1200
1400
1600
1800
2000
505 510 515 520 525 530 535 540
Pressure Reading
Vo
lum
e (m
L)
April 20, 2006 Copyright © 2006, Vedo Medico 19
Results & Analysis
• Measurement Unit– Vedo (1 Vedo 50mL)– Volume vs. Circumference– Test objects range from 10
to 37 Vedo
• Repeatability– Same measurement done
many times– Standard deviations of ~1
Vedo
Vedo vs mL for Enclosure(Final Procedure)
y = 50.066x
0
200
400
600
800
1000
1200
1400
1600
1800
2000
0 5 10 15 20 25 30 35 40
Volume (Vedo)
Vo
lum
e (m
L)
April 20, 2006 Copyright © 2006, Vedo Medico 20
Product Design - Software
• Embedded Software– 3 Menu: Simple Operation
• Host Software– GUI:
• Visual Basic Program
– MS Access Database
April 20, 2006 Copyright © 2006, Vedo Medico 21
Product Design - Software
Start
View Data
Connect PC
Save Measurement
Patient NamePatient
Measurements
Measuring…. Enter Patient Name
New Patient
Syncing…. Host Software
April 20, 2006 Copyright © 2006, Vedo Medico 24
Product Design - Software
• Designing a fully functional DB• 2 tier application, support many users
April 20, 2006 Copyright © 2006, Vedo Medico 25
Product Design - Software
• Synchronization and handshaking
• Plug and Play behavior
• Handling exceptions in the DB
• Communication between application & DB
• DB queries optimization
April 20, 2006 Copyright © 2006, Vedo Medico 26
Challenges - Software
• AVR DataFlash®– Stopped functioning
• Program Memory Limitation– Required Embedded Software Optimization
April 20, 2006 Copyright © 2006, Vedo Medico 27
Challenges - Hardware
• Pressure Sensor– Too sensitive
• Enclosure System– Initial Bladder too small– Sealed food saver bags
April 20, 2006 Copyright © 2006, Vedo Medico 28
Future Work
• Integrate device with blood pressure monitor
• Make DataFlash® operational
• Wireless connectivity to PC
• Redesign the Enclosure to be soft and flexible
April 20, 2006 Copyright © 2006, Vedo Medico 29
Timeline
Task Actual timeline Achieved timeline
Project proposal January 23rd January 23rd
Research February 15th February 10th
Functional Specs February 20th February 20th
Design Specs March 6th March 9th
Enclosure Design March 6th February 15th
Preliminary Hardware March 10th March 15th
Embedded Software April 15th April 10th
Integration April 10th April 16th
Fully functional Prototype April 10th April 20th
April 20, 2006 Copyright © 2006, Vedo Medico 30
Budget
Projected Cost Actual CostMicrocontroller/Debugger
Software
$40.00 $65
Sensors $150.00 $62.75
Actuator( Pump/Valve) $80.00 $134.72
Serial Interface $50 N/A
Power supply / Battery $100.00 N/A
Enclosure $20.00 $82.75
Prototype Board $30.00 N/A
Electronic components $15.00 $52.94
Shipping & Handling $25.00 $14.00
Total $510.00 $412.16
April 20, 2006 Copyright © 2006, Vedo Medico 31
Conclusion
• Air Pressure sensor and Properties of ideal gases.
• Challenging experience starting project from scratch to completion
• Try to keep the solution simple. (Less implementation time, less error).
• Order extra parts for key components
April 20, 2006 Copyright © 2006, Vedo Medico 32
Acknowledgements
• Dr. Andrew Rawicz
• Dr. Tatjana Z.
• Dr. Hamid Masoodi
• Fairchild Semiconductors
• FreeScale