Patient monitor User’s manual
Chapter 9-1
The measurement of oxygen saturation of arterial blood (also known as
pulse oxygen saturation, usually shortened as SpO
2
) adopts the principles of
light spectra and volume tracing. The LED emits lights with two specific
wavelengths, which are selectively absorbed by oxygenated hemoglobin and
deoxyhemoglobin. The optical receptor measures the changes in the light
intensity after the light passes the capillary network and estimates the ratio of
oxygenated hemoglobin and the total hemoglobin.
The SpO
2
sensor measurement wavelengths are nominally 660nm for the
Red LED and 940nm for infrared LED.
Use only SpO2 sensors specified in this manual. Follow the SpO2
sensor’s instructions for use and adhere to all warnings and cautions.
When a trend toward patient deoxygenation is indicated, blood
samples should be analyzed by a laboratory co-oximeter to completely
understand the patient’s conditions.
Do not use the monitor and the SpO2 sensor during magnetic
resonance imaging (MRI). Induced current could cause burns.
Prolonged continuous monitoring may increase the risk of unexpected
changes in skin characteristics, such as irritation, reddening,
blistering or burns. Inspect the sensor site every two hours and move
the sensor if the skin quality changes. For neonates, or patients with
poor peripheral blood circulation or sensitive skin, inspect the sensor
oxyhemoglobin + deoxyhemoglobin
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