Jonathan Meyer Bogdan Dzyubak Matt Parlato Joe Helfenberger

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

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

~ Price is too expensive ~ $ OctiveTech 300C $ BCI FingerPrint®Devon Medical C202 $99.99 EWH Target Price: Under $8 for final probe cost Photos:

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

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

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

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

ProsCons Convenient for spot checksUnreliable peripheral circulation ComfortableFingernail polish Wears out easily 2 LEDs (bottom) Phototransistor (top)

ProsCons DurableInconvenient to adjust headband Reliable circulationLow signal resolution Versatile adjustmentPossibility of misuse Works on all age groups  Around head Around Head  2 LEDs3 Phototransistors

ProsCons Convenient for spot checksMoving parts, possibly not as durable Reliable circulationAdjustability is lower High signal resolution 2 LEDs  Phototransistor  Ear Strap

WeightFingerForeheadEar Cost10%778.5 Accuracy25% Ease of Use20% Range of Use20% Durability25% Total100% EAR PROBE WINS!!!

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

1. Test the probe’s accuracy and ease of use 2. Mechanically test the probe’s durability 3. Develop working prototype

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