A Mobile Wireless Electrocardiogram System for Health Care Facilities

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 measure
  and store heart rhythm data, allow patients
  freedom of movement, and communicate with a
  central base station

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Mobile Wireless EKG System
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Two Stage Implementation
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Stage 1Front End Circuitry
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Stage 2EKG Data Acquisition
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• PCB connects to eBOX through mic
• Original design used Phidgets at 65 Hz
• Sound card gives up to 44.1 kHz

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Mobile System Software
Records 5 sec. heart signal to .WAV file on eBOX
Picture of batch file
Converts .WAV data to .TXT file containing (x,y)
pair
Transfers heart signal WAV and (x,y) pair TXT
files to base station PC using WindowsCE
filesharing
Deletes current heart data from eBOX
Restarts program for another heart sample
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Base Station GUI
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Beats per Minute

• Measures period
• of heartbeat
• Finds average
• period

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Design Modifications
Changes Reasoning
ADC Analog signal read by eBOX sound card Orginal design used phidgets interface board Needed higher sampling rate
Amplifier 1000 to 831 gain Needed 1 Vp-p for microphone input
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Technical Specifications
Proposed Actual
Range 38 meters 45 meters
Battery life 1.25 hours 3.5 hours
Weight 1.3 kg 1.5 kg
Size 150X115X80 mm 241X161X76 mm
Resolution 65 Hz 22050 Hz
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Timeline
Expected Actual
Integration of Two Stages October 12 November 19
Complete Wi-Fi data transmission October 26 November 2
Final Computer Interface Software November 7 October 19
Packaging November 26 November 28
Testing and Tweaking November 30 November 26
Final Presentation December 5 December 5
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Marketing and Cost

• Customers
• Hospitals
• Nursing and Retirement Homes
• Assisted Living Care Centers
• Cost Analysis
• Selling Price 650
• Profit (for 10,000 units) 963,114

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Future Work

• Battery Life
• Optimized Packaging
• Streaming Measurements
• Alarms
• PDA and GPS support

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Results

• Reliable EKG Recording
• Wireless Transfer
• Simple GUI
• Demonstration Video