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WARM Wireless ECG Monitor

Designing a portable, wireless ECG monitor to offer real-time heart health data and alert emergency contacts.

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WARM Wireless ECG Monitor

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  1. WARM Wireless ECG Monitor Melvin Rivera Suárez Project Manager Alexis Ortiz Pérez Rafael Vega Díaz Wilfredo Bermúdez Soto

  2. Issues • An estimated 80,700,000 American adults (one in three) have one or more types of cardiovascular disease • Every minute counts. For every minute heart failure goes untreated, unrecoverable damage occurs to the heart muscle

  3. Problem Statement • Current heart monitoring equipment is commonly stationary, available to patients at hospitals or at their house • Patients’ lifestyle often makes it difficult for them to access heart monitoring equipment. • Health care professionals need live data on the health of their patients to help them during emergencies

  4. Scope • Device • Measure the ECG wave form and analyze • Portable, wireless • Detect if the user is having a heart attack or any other heart problem. • Mobile phone • Receive the alert of the device and send a message to the persons previously selected • Beyond our scope • Power consumption optimization of the Analog circuit

  5. Objectives • Software optimization. Should be easy installable within a 15 minutes by Nov 2. • Have a working prototype by Nov 21. • Hand in a written system manual to the project manager for review. It should describe all the system functionalities and legal disclaimers by Nov 24. • Tests in different scenarios. This will help to detect any situation not considered in the design process by Nov 25.

  6. System Overview

  7. Hardware Block Diagram

  8. ECG Waveforms • Electrocardiogram: • Measure of the heart’s electrical activity • Heart Rate • PR Interval • QRS Duration • QT Interval • QRS Axis

  9. ECG Sensors • Ideally, any type of electric contact could be used • However, wearable, safe and reliable electrodes are desired for the final product • Standard medical ECG electrodes will be used • Two electrodes to be placed on the patient’s chest • Third electrode will be internal to the circuit: Virtual right leg driven

  10. Portable Patient Device • Analog Circuit • Instrumentation Amplifier: AD624 • Appropriate for amplifying small signals • High Gain: Adjustable up to 10K • High Common Mode Rejection Ratio: 80 dB @ unity gain • Low Noise: 4 nV/√Hz @1 kHz • Photo coupler: PS2506 • Electrically isolates the amplifier output signal from the rest of the device • System security measure • Band Pass Filter • Filters signals below 0.04 Hz to 150 Hz • Average heart signal is 50Hz to 70 Hz

  11. ECG Circuit

  12. Microcontroller • MSP430F149: Ultra low power 16 bit microcontroller • Responsible for all needed calculation of the ECG wave form • Provides the necessary synchronization of the system • Specs: • Supports clock rates up to 8MHz • 60 KB of flash ROM • 2 KB of RAM • 12-bit ADC • 2 DAC outputs, 2 UART (serial) ports, and 48 General Purpose IO (GPIO) pins

  13. Bluetooth Module • KCWireFree KC21Bluetooth module • Class 2 module • Average power dissipation: 2.5mW • Small and power efficient • 10m Range • Built in antenna

  14. Mobile Phone Software • Interface between the monitor and the patient • Holds emergency contacts, and alerts them in case of a heart attack • Development Platform: J2ME • JAVA as a development tool for Mobile devices • Development Tools • Eclipse, MicroEmulator, NetBeans

  15. Mobile Phone Initialization

  16. Mobile Phone Screens

  17. Mobile Phone Screens

  18. Microcontroller Software

  19. Team Organization • Hardware • Melvin Rivera • Rafael Vega • Software • Alexis Ortiz • Wilfredo Bermúdez

  20. Budget

  21. Risks • Hardware components damaged • Unavailability of components • Data lost or damaged • Computer Crash • Loss of a Team Member

  22. Project Impact • Environmental Issues • Battery Disposal • Legal Issues • Harmful Electromagnetic Interference • Social Impacts • Mobile Phone Radiation • Might give a false sense of security to a patient which condition really needs a direct hospital care

  23. Conclusion • Monitor heart status anytime, anyplace • Portable device can be worn and is easy to carry • Provides patients with reliable heart monitoring • Mobile phone software displays heart status • Provides patients with prompt medical assistance • Send an emergency message if user has a heart attack or any emergency situation. • Improve the time of an emergency response

  24. Questions?

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