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A Mobile Wireless Electrocardiogram System for Health Care Facilities
John FarnerJason Fritts
Julian JaegerJoe Richard
Georgia Institute of Technology
School of Electrical and Computer Engineering
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Project Overview
A mobile wireless EKG system that will track and store heart rhythm data, allow patients freedom of movement, and communicate with a central base station
Marketed to hospitals, nursing homes, and other health facilities to assist medical staff and increase patient care quality
Provide a reasonable alternative to conventional EKG systems at a reduced cost
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Design Objectives
Safe for user Reliable EKG data under a variety of
circumstances Base station interface Easy to use mobile system Lightweight and small size Long range wireless data transfer
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Two Stage Implementation
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Stage 1:Measuring Potential Across the Human BodyAverage Heartbeat
Men: 70 bpm
Women: 75 bpm
Up to 200 bpm Exercising
Chest Voltage, 0.5 mV to 5.0 mV
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Front End Circuitry
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AD624ADPrecision Instrumentation Amplifier
Programmable gain between 1 and 1000
CMRR exceeds 110 dB when the gain is set to 1000
http://www.ortodoxism.ro/datasheets/analogdevices/AD624BD.pdf
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Linear Bandpass Filter
No battery power consumption
Loss of half the signal strength during testing
Bandwidth ≈ 1 Hz – 20 Hz
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Linear Bandpass Filter Bode Plot
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Reducing Input Signal Noise
Before Filter After Filter
http://www.analog.com/library/analogDialogue/archives/37-11/ecg.html
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Stage 2:EKG Data Acquisition
http://robot.lonningdal.net/parts/phidgets.jpghttp://f.ipc2u.ru/files/products/34462/ebox2300.jpg
A Phidgets voltage sensor gathers data from the output of the front end circuitry
An onboard ADC converts analog signal to digital values
A C# OS subproject stores the digital data for later transmission to the base station
USB
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Mobile System SoftwareStart
Gather initial analog input values
Store digitally as Y0
Initialize timer
Store time as X0
Have analog inputs changed?
Has timer reached 5 sec?NO
Read system time
Store time as Xi
Read analog input
Store digitally as Yi
YES YES
Run a second timer to wait 5 min between EKG readings
Event Handling
NO
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Wireless Communication
http://z.about.com/d/compnetworking/1/0/q/3/linksys_wrt54g.jpghttp://www.embeddedpc.net/Portals/6/WiFi_Option.jpg
Files shared using Windows CE filesharing on a local area network.
eBOX uses a mini PCI 802.11g WiFi card
Base station connected to a Linksys 802.11g WiFi router
802.11g WiFi Standard
Provides sufficient range (up to 38 meters)
Provides data transfer rate of 54 Mbps
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Base Station GUI
Select patient from drop-down menu
Patient’s information is displayed in text boxes
Select desired heart data from list box to be graphed
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Design ChoicesAdvantages Disadvantages
Amplifier- Single component
- 1K amplification
- Precision measurement
- Power consumption
- Cost
Isolation- Patient safety
- Low cost solution- Less robust design
Filtering - No battery power consumption
- Signal attenuation
Phidgets- Ease of use
- Onboard ADC- Low sensor sampling rate
eBOX- Ease of use
- Built in wireless capabilities
- Power consumption
Wi-Fi- Cost
- Ease of installation- Cell phone modem gives longer range
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Project Timeline
Integration of Two Stages
October 22
Complete Wi-Fi data transmission
October 31
Final Computer Interface Software
November 7
Packaging November 28
Testing and Tweaking December 3
Final Presentation December 5
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Future Work
Integration of stage 1 and stage 2 Data transfer
Connection between eBOX and base station Automated file sharing
Mobile power options: Use a 2nd voltage regulator or voltage supply Use a 5V rail voltage
Packaging for mobility
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“This year an estimated 1.2 million Americans will have a new or recurrent coronary attack.”
http://www.americanheart.org/presenter.jhtml?identifier=4478