oCare
TM
Pro 100
80
maximum and minimum light absorption measured at systole
and diastole. It focuses on light absorption by pulsating arterial
blood, eliminates the effect of non-pulsating absorbers such as
tissue, bone and venous blood.
By calculating the ratio of absorbance of Hb and HbO
2
at red
and infrared beams during the arterial pulsing respectively,
oCare
TM
Pro 100 determines functional oxygen saturation of
arterial blood. The pulse wave of photoplethysmography
measured by the changing optical absorption, also leads to
determine the pulse rate.
There are two common types of pulse oximetry sensor, referred
to as transmission mode and reflectance mode. The
transmission oximetry sensor is configured with LED and PD
positioned on opposing surfaces of the tissue (i.e. finger,
earlobe), then the PD detects predominantly forward scattered
light transmitted through a tissue. In the reflectance oximetry
sensor, LED and PD are located on the same side and the
sensor is applied to one surface of the tissue (i.e. finger,
forehead and wrist), so that the PD measures the scattered light
that is reflected from the pulsating arteriolar bed. The terms
transmittance and reflectance refer to the geometry of pulse
oximetry and are not related to the principle of pulse oximetry
and how the light is absorbed by the hemoglobin. Both
transmission and reflectance pulse oximetry sensor measure the
functional oxygen saturation of arterial blood by the same
principal of pulse oximetry.
To Next Page
Loading...