Principles Of Operation; Overview - Covidien Nellcor OxiMax N-600x Operator's Manual

Principles of Operation

Overview

N-600x Operator's Manual
The N-600x uses pulse oximetry to measure functional oxygen
saturation in the blood. Pulse oximetry works by applying an
O M sensor to a pulsating arteriolar vascular bed, such as a
XI AX
finger or toe. The O M
XI
a photo detector.
Bone, tissue, pigmentation, and venous vessels normally absorb a
constant amount of light over time. The arteriolar bed normally
pulsates and absorbs variable amounts of light during the
pulsations. The ratio of light absorbed is translated into a
measurement of functional oxygen saturation (SpO
Because a measurement of SpO
the O M sensor, excessive ambient light can interfere with this
XI AX
measurement.
Specific information about ambient conditions, O
application, and patient conditions is contained throughout this
manual.
Pulse oximetry is based on two principles: that oxyhemoglobin
and deoxyhemoglobin differ in their absorption of red and
infrared light (spectrophotometry), and that the volume of arterial
blood in tissue (and hence, light absorption by that blood)
changes during the pulse (plethysmography). A pulse oximeter
determines SpO by passing red and infrared light into an
2
arteriolar bed and measuring changes in light absorption during
the pulsatile cycle. Red and infrared low-voltage light-emitting
diodes (LED) in the oximetry O
a photo diode serves as the photo detector.
Principles of Operation
sensor contains a dual light source and
AX
is dependent upon light from
2
M sensor serve as light sources;
XI AX
).
2
M sensor
XI AX
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