Embedded Files
Summary of Final Design
The O2 scope provides a portable otoscope and ophthalmoscope that does not require charging or batteries. At a fraction of the price of existing devices, the O2 scope is able to perform the same functions without the need of replacing batteries or switching between an otoscope head and ophthalmoscope head. In our final design, we've decided to use a linear alternator to charge a super-capacitor to provide power for our device.
Internal Components
Power Generation
In order to generate power, several designs were considered. Ultimately the linear alternator was chosen because it is easy to manufacture and can be fully contained within the handle offering a sleek and minimal design of the tool. While keeping the overall length of the power generation component short, the component was able to output 0.845 Watts.
External Components
Head Design
Otoscope Head
The otoscope housing is designed to work with a circular-shaped magnifying lens which would by attached to the outside of the housing. The otoscope light is placed inside of a narrow tube in the inner part of the housing.
Ophthalmoscope Head
The ophthalmoscope head is designed to fit the optic lenses and LED, while providing a viewing window for medical practitioner’s use.
Linear Alternator
Power Storage
For power storage we decided to use a capacitor instead of a rechargeable battery. Due to the fact that examinations will take less than 30 seconds, a capacitor provides faster charging times while providing enough power for the duration of the exam. With the capacitor, it would take up to 10 seconds of shaking to charge the capacitor to generate enough power for the LED when the capacitor is fully depleted. However, under normal conditions, there will be residual charge in the capacitor so that it would only take 2.8 seconds to charge.
ELNA Supercapacitor Internal Circuit
Switch
The switch is a double pole double throw switch that provides two on connections and one off connection. For future improvements a rheostat can be used to allow control over light intensity.
Handle Design
A secondary goal for the O2 scope was to improve the ergonomics and usability of these devices as they were not designed for comfort ease of use. Most handles on the market today are a simple cylinder with no grip that does not fit the hand very well. With this in mind, the O2 scope handle design offer a much better product in terms of feel and function. With the addition of finger grooves and organic shape, the tool can be used ambidextrously and conforms to the shape of the hands.
Double pole double throw
LED
LEDs were chosen due to a lower power draw. White colored light is preferred for proper imaging.
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