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A Mobile Wireless Electrocardiogram System for Health Care Facilities

A Mobile Wireless Electrocardiogram System for Health Care Facilities

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A Mobile Wireless Electrocardiogram System for Health Care Facilities

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  1. 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

  2. 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

  3. 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

  4. Two Stage Implementation

  5. Stage 1:Measuring Potential Across the Human Body • Average Heartbeat • Men: 70 bpm • Women: 75 bpm • Up to 200 bpm Exercising • Chest Voltage, 0.5 mV to 5.0 mV

  6. Front End Circuitry

  7. 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

  8. Linear Bandpass Filter • No battery power consumption • Loss of half the signal strength during testing • Bandwidth ≈ 1 Hz – 20 Hz

  9. Linear Bandpass Filter Bode Plot

  10. Reducing Input Signal Noise Before Filter After Filter http://www.analog.com/library/analogDialogue/archives/37-11/ecg.html

  11. Stage 2:EKG Data Acquisition USB http://f.ipc2u.ru/files/products/34462/ebox2300.jpg http://robot.lonningdal.net/parts/phidgets.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

  12. Mobile System Software Gather initial analog input values Store digitally as Y0 Start Initialize timer Store time as X0 Event Handling Have analog inputs changed? Has timer reached 5 sec? NO NO YES YES Read analog input Store digitally as Yi Run a second timer to wait 5 min between EKG readings Read system time Store time as Xi

  13. Wireless Communication http://z.about.com/d/compnetworking/1/0/q/3/linksys_wrt54g.jpg http://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

  14. 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

  15. Design Choices

  16. Project Timeline

  17. 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

  18. “This year an estimated 1.2 million Americans will have a new or recurrent coronary attack.” http://www.americanheart.org/presenter.jhtml?identifier=4478