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EWH: Low Cost Pulse Oximeter

EWH: Low Cost Pulse Oximeter. Jonathan Meyer Bogdan Dzyubak Matt Parlato Joe Helfenberger. Question. Q: What would be a useful device in hospitals of the developing world? A device to check oxygen saturation within a subset of patients. Pulse Oximeter. Pulse Oximeter.

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EWH: Low Cost Pulse Oximeter

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  1. EWH: Low Cost Pulse Oximeter Jonathan Meyer Bogdan Dzyubak Matt Parlato Joe Helfenberger

  2. Question • Q: What would be a useful device in hospitals of the developing world? • A device to check oxygen saturation within a subset of patients. Pulse Oximeter

  3. Pulse Oximeter • Detects blood Oxygen saturation • Prevention of complications by identification of hypoxemia • Used in cases where symptoms and feedback is limited • Under anesthesia • Unconscious (critical care)‏ • Chronic conditions checkup • Infants

  4. Why aren’t pulse oximeters common in developing countries? ~ Price is too expensive ~ BCI FingerPrint® OctiveTech 300C Devon Medical C202 $692.00 $265.00 $99.99 EWH Target Price: Under $8 for final probe cost Photos: http://www.google.com/products?q=pulse+oximeter&scoring=pd, http://www.buyemp.com/product/1040108.html, http://www.devonsuperstore.com/detail.aspx?ID=189

  5. Oximetry principles • Light is shined through blood vessels • Absorption occurs in skin, veins, and arteries • Arteries carry oxygenated blood (affects absorption)‏

  6. Oximetry principles (cont.)‏ • Two LEDs shine light of 660 and 940 nm • detected by photodiode on opposite side • Ratio of absorption is used to calculate oxygenation • Only changing signal is used • Frequency of 0.8 – 2 Hz

  7. Probe Types • Transmittance – finger or ear • Reflectance • Requires underlying bone – forehead or sternum • Needs more light or better detectors • Offers different design possibilities

  8. Considerations and limitations • Precision should be within 5%, preferably 3% • Cost should be low • Final product manufacturable at $8 • Should be durable and/or easy to repair • Convenient to use • Compatible with driver circuit

  9. Design Options: Finger Probe Phototransistor (top) 2 LEDs (bottom)

  10. Design Options: Forehead Probe 2 LEDs 3 Phototransistors  Around head Around Head

  11. Design Options: Ear Probe Ear Strap 2 LEDs  Phototransistor

  12. Design Options: The Matrix EAR PROBE WINS!!!

  13. Future Work • Issues to Address are: • Finalize housing design • Proper mounting of electronics • Determination of exact voltage and current specifications • Addition of filters • Mechanical testing of device durability

  14. Goals for this Semester • Test the probe’s accuracy and ease of use • Mechanically test the probe’s durability • Develop working prototype

  15. Conclusion • Goal: A pulse oximeter probe must be designed that is not only durable but is accurate, cheap, and can be used for a variety of patients • Transmittance through the ear • Robust mechanical design that will be: • easy for the doctor to use and adjust • extremely durable

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