April 20, 2006Copyright © 2006, Vedo Medico1. April 20, 2006Copyright © 2006, Vedo Medico2 Edema...


Edema Measurement System (EMS)

Presented by Vedo Medico teamAli Khan

Sepehr MoghareiArthur Arash Papian Gorji

Babak ShafieiBranko Zdravkovic


Agenda

• Introduction• Purpose• Product Overview• Product Design• Results and Analysis • Challenges • Timeline and Budget• Conclusion• Questions• Demonstration


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


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


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


Product Overview

• Design Approaches– Digital image processing– Digital measuring using position sensors– Circumference measurement by resistance

• Final Design– Volume measurement by pressure sensor


Product Overview


Product Overview

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Product Overview


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


Final Design

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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)


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)


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)


Product Design - Software

• Embedded Software– 3 Menu: Simple Operation

• Host Software– GUI:

• Visual Basic Program

– MS Access Database



Start

View Data

Connect PC

Save Measurement

Patient NamePatient

Measurements

Measuring…. Enter Patient Name

New Patient

Syncing…. Host Software



• User friendly GUI



• Clearly presenting data



• Designing a fully functional DB• 2 tier application, support many users



• Synchronization and handshaking

• Plug and Play behavior

• Handling exceptions in the DB

• Communication between application & DB

• DB queries optimization


Challenges - Software

• AVR DataFlash®– Stopped functioning

• Program Memory Limitation– Required Embedded Software Optimization


Challenges - Hardware

• Pressure Sensor– Too sensitive

• Enclosure System– Initial Bladder too small– Sealed food saver bags


Future Work

• Integrate device with blood pressure monitor

• Make DataFlash® operational

• Wireless connectivity to PC

• Redesign the Enclosure to be soft and flexible


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


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


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


Acknowledgements

• Dr. Andrew Rawicz

• Dr. Tatjana Z.

• Dr. Hamid Masoodi

• Fairchild Semiconductors

• FreeScale


Questions?

April 20, 2006Copyright © 2006, Vedo Medico1. April 20, 2006Copyright © 2006, Vedo Medico2 Edema...

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