Mentor: Prof. K. Mani Chandy Co-Mentor: Dr. Julian BunnBy: Victor Chu & Aleksander PalatnikOctober 2009
Who Supported Us
Modern Medicine
Stethoscope
Electrocardiogram
Objectives
Platform
Stethoscope & Results
Electrocardiogram & Results
Future Plans
Acknowledgments & References
Infospheres Group◦ Sense and Respond◦ Prof. K Mani Chandy◦ Projects include:
Virtual Environments for Radiation Detection The Event Driven Web Personal Monitors
Dr. Julian Bunn Prof. Chanhuei Yang
Expensive Devices◦ Spirometer
Device: $10 - $500+◦ Echocardiograms (Ultrasound)
Procedure + Interpretation: $250 - $600 ◦ Electrocardiogram
Device: $300 - $1500 Procedure + Interpretation: $30 - $60
◦ Stethoscope Device: $1 - $300 Procedure + Interpretation: $45 - $80
Preliminary Screening
Auscultationo Measurement and interpretation of
heart sounds
o A bell with a diaphragm amplifies the audio produced by blood moving within the heart
o 1-3Hz signal from heart beato Higher frequencies from turbulence (Murmurs)
Transthoracic interpretation of electrical activity of the heart
Multiple Leads – Can be 3, 5, 12, etc. High Pass Filter 1 Hz Low Pass Filter 40 Hz
Connecting Medical Devices to Cell phones◦ Cell phones are ubiquitous◦ Powerful processors◦ Ability to transmit data
Stethoscope◦ Inexpensive and simple device◦ Can indicate many heart problems
Electrocardiogram◦ Relatively inexpensive platform◦ Extremely valuable diagnostic tool
G1 Google Android phone (HTC Dream)◦ Developer’s Edition◦ Java◦ Android Emulator
Samsung SGH-A737◦ Testing Purposes
Littman Stethoscope $50 - $300
Budget Stethoscope $1 - $5
3M Poster Strips Used to create a seal between
stethoscope and microphone Strip of foam with adhesive
on both sides
Stethoscope Recording Performed several recordings using a built-in laptop
microphone with the Audacity program Applied noise-reduction, amplification Low-cost stethoscope:
Littmann stethoscope:
Peak-finding algorithm Time-domain only Based on Envelope Peak determination
by variable thresholding
Median Filter Looking between
peaks yields murmur level
Functional up to medium-severity murmur
Passive Analog Circuit◦ 9 Volt Battery Power Source◦ 400x amplification◦ Analog output
3 Leads◦ Body◦ 2 Signal
Pre–1984 Pennies + Lotion◦ Copper
Q-Trace Electrodes
Laptop Results◦ Audacity◦ High Pass Filter 1 Hertz, Low Pass Filter 40 Hertz
Waves identifiable◦ P, Q, R, S components
visible◦ T Wave not visible
Develop software for stethoscope System◦ Migrate code to cellular phone system◦ Improve artifact resistance◦ Improve pathology detection
Develop better hardware for ECG system◦ Stabilize system◦ Implement more efficient designs◦ Minimize costs
Prof. K. Mani Chandy Dr. Julian Bunn Dr. Danny Petrasek Prof. Al Barr Prof. Chanhuei Yang Surf Office
Thank You and Have a good summer!
Victor ChuAleks Palatnik
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