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A Mobile Wireless Electrocardiogram System for Health Care Facilities John Farner Jason Fritts Julian Jaeger Joe Richard Georgia Institute of Technology School of Electrical and Computer Engineering 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 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 Two Stage Implementation Stage 1: Measuring Potential Across the Human Body Average Men: Heartbeat 70 bpm Women: Up 75 bpm to 200 bpm Exercising Chest Voltage, 0.5 mV to 5.0 mV Front End Circuitry AD624AD Precision 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 Linear Bandpass Filter No battery power consumption Loss of half the signal strength during testing Bandwidth ≈ 1 Hz – 20 Hz Linear Bandpass Filter Bode Plot Reducing Input Signal Noise Before Filter http://www.analog.com/library/analogDialogue/archives/37-11/ecg.html After Filter Stage 2: EKG Data Acquisition USB http://robot.lonningdal.net/parts/phidgets.jpg http://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 Mobile System Software Start Gather initial analog input values Store digitally as Y0 Initialize timer Store time as X0 Event Handling Have analog inputs changed? YES Read analog input Store digitally as Yi Read system time Store time as Xi NO NO Has timer reached 5 sec? YES Run a second timer to wait 5 min between EKG readings Wireless Communication http://www.embeddedpc.net/Portals/6/WiFi_Option.jpg http://z.about.com/d/compnetworking/1/0/q/3/linksys_wrt54g.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 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 Design Choices Advantages 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 - Power consumption - Built in wireless capabilities Wi-Fi - Cost - Ease of installation - Cell phone modem gives longer range Project Timeline Integration of Two October 22 Stages Complete Wi-Fi data October 31 transmission Final Computer Interface November 7 Software Packaging November 28 Testing and Tweaking December 3 Final Presentation December 5 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 “This year an estimated 1.2 million Americans will have a new or recurrent coronary attack.” http://www.americanheart.org/presenter.jhtml?identifier=4478