Mortara T12, User Manual

Page: 32 / 54

SECTION 2
12
Patient Pulse Oximeter Sensor Application
Select a suitable site for the SpO
2
sensor. The patient’s first or index finger is the preferred location. Alternative
sites recommended are the thumb or little finger. Refer to the user instructions accompanying the sensor type being
used for proper application. Make sure a firm contact is obtained.
Connect the SpO
2
sensor cable to the T12S (see
Attaching the SpO
2
Sensor Cable
) and verify proper operation by
following the instructions in this section of the user manual.
Pulse Oximeter Theory of Operation and Recommendations For Use
The pulse oximetry sensor works by applying a sensor to a pulsating arteriolar vascular bed. The sensor contains
light-emitting diodes that emit light at 660 nm (red) and 905 nm (infrared) wavelengths that are measured by a light-
sensitive detector in the opposite side of the sensor.
Light-emitting diodes
Tissue, bone, venous blood, etc., normally absorb a constant
amount of light from the arterial blood. The arteriolar bed
normally pulsates and absorbs variable amounts of light during
systole and diastole as blood volume increases and decreases.
The ratio of light absorbed at systole is compared to the ratio at
diastole to calculate an oxygen saturation measurement.
Light-sensitive detector
WARNING: If the sensor is wrapped too tightly or supplemental tape is applied, venous pulsations may
lead to inaccurate saturation measurements.