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Connecting Medical Devices to Cell Phones Mentor: Prof. K. Mani Chandy Co-Mentor: Dr. Julian Bunn By: Victor Chu & Aleksander Palatnik October 2009.

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Presentation on theme: "Connecting Medical Devices to Cell Phones Mentor: Prof. K. Mani Chandy Co-Mentor: Dr. Julian Bunn By: Victor Chu & Aleksander Palatnik October 2009."— Presentation transcript:

1 Connecting Medical Devices to Cell Phones Mentor: Prof. K. Mani Chandy Co-Mentor: Dr. Julian Bunn By: Victor Chu & Aleksander Palatnik October 2009

2  Who Supported Us  Modern Medicine  Stethoscope  Electrocardiogram  Objectives  Platform  Stethoscope & Results  Electrocardiogram & Results  Future Plans  Acknowledgments & References

3  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

4  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

5 Stethoscope  Auscultation o 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 beat o Higher frequencies from turbulence (Murmurs)

6  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

7  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

8  G1 Google Android phone (HTC Dream) ◦ Developer’s Edition ◦ Java ◦ Android Emulator  Samsung SGH- A737 ◦ Testing Purposes

9 Stethoscope Connections  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

10  Stethoscope Recording  Performed several recordings using a built-in laptop microphone with the Audacity program  Applied noise-reduction, amplification  Low-cost stethoscope:  Littmann stethoscope:

11  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

12  Passive Analog Circuit ◦ 9 Volt Battery Power Source ◦ 400x amplification ◦ Analog output

13 Electrocardiogram Connections  3 Leads ◦ Body ◦ 2 Signal  Pre–1984 Pennies + Lotion ◦ Copper  Q-Trace Electrodes

14 Electrocardiogram Results  Laptop Results ◦ Audacity ◦ High Pass Filter 1 Hertz, Low Pass Filter 40 Hertz

15 Electrocardiogram Results  Waves identifiable ◦ P, Q, R, S components visible ◦ T Wave not visible

16  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

17  Prof. K. Mani Chandy  Dr. Julian Bunn  Dr. Danny Petrasek  Prof. Al Barr  Prof. Chanhuei Yang  Surf Office

18 Thank You and Have a good summer! Victor Chu Aleks Palatnik

19 [1] "Spirometry." Wikipedia, The Free Encyclopedia. 14 Sep 2009, 13:30 UTC. 14 Sep 2009.http://en.wikipedia.org/w/index.php?title=Spirometry&oldid= [2] "Angiography." Wikipedia, The Free Encyclopedia. 24 Sep 2009, 23:14 UTC. 24 Sep 2009.http://en.wikipedia.org/w/index.php?title=Angiography&oldid= [3] Cardiac electrophysiology. (2009, September 24). In Wikipedia, The Free Encyclopedia. Retrieved 01:40, September 24, 2009, from [4] "Stethoscope." Wikipedia, The Free Encyclopedia. 20 Sep 2009, 20:36 UTC. 20 Sep 2009.\http://en.wikipedia.org/w/index.php?title=Stethoscope&oldid= [5] "Aortic aneurysm." Wikipedia, The Free Encyclopedia. 14 Sep 2009, 23:17 UTC. 14 Sep 2009.http://en.wikipedia.org/w/index.php?title=Aortic_aneurysm&oldid= [6] "The Stethoscope - Essential Medical Equipment." Information and Advice for Medical Students: Stethoscope. 24 Sep 2009.http://www.davidgregory.org/medical/stethoscope.htm

20 [7] "The Ultimate Acoustic Stethoscope Review." The Consumer Magazine For Doctors. 24 Sep 2009.http://www.forusdocs.com/reviews/Acoustic_Stethoscope_Review.htm [8] "Electrocardiography." Wikipedia, The Free Encyclopedia. 24 Sep 2009, 14:21 UTC. 24 Sep 2009.http://en.wikipedia.org/w/index.php?title=Electrocardiography&oldid= [9] "Homemade Electrocardiograph." Homemade Electrocardiograph. 24 Sep 2009.http://www.eng.utah.edu/~jnguyen/ecg/ecg_index.html [10] “Cost of Services” Harvard Pilgrim Health Care. 16 Oct Oct 2009 https://www.harvardpilgrim.org/portal/page?_pageid=253,192924&_dad=portal&_sch ema=PORTAL [11] “EKG Machines” Medical Device Depot Inc. 16 Oct Oct 2009


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