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2) Using a self-adjusting smart spring system to fit
user’s finger
snugly but not too tight as to impede blood flow that may lead to
a low PI.
3) Using soft, hypoallergenic medical grade silicone in the finger
chamber to minimize discomfort to us
er’s finger.
4) Using solid ABS plastic to block ambient light from reaching
the sensor so that the signal to background ratio and the
accuracy of the measurement is dramatically increased.
5) Adding two invaluable features, the plethysmograph and the
perfusion index (PI), that help user determine the optimal time to
get an accurate and reliable reading every time (See Chapter
3.3.7 about plethysmograph and perfusion index ).
