GE HEALTHCARE B20, User'S Reference Manual

Page: 219 / 320

Pulse oximetry
13-3
Overview
Oxygen saturation SpO
2
is the percentage of saturated hemoglobin compared to total
hemoglobin measured by a two wavelength pulse oximeter (also called functional or In Vivo
oxygen saturation.
The SpO
2
value is measured by light absorption technique: Red and infrared light is emitted
from the emitter side of the sensor. The light is partly absorbed when it passes through the
monitored tissue. The amount of transmitted light is detected in the detector side of the sensor.
When the pulsative part of the light signal is examined, the amount of light absorbed by arterial
hemoglobin is discovered and the saturation level can be calculated.
The plethysmographic pulse wave is derived from variations of the intensity of the transmitted
light and reflects the blood pulsation at the measuring site. Thus the amplitude of the
waveform reflects the perfusion.
The monitor have three options for SpO
2
configuration: GE, Masimo and Nellcor. The set up will
be preconfigured by the manufacturer according to your choice. Depending on the different
SpO
2
configuration, not all SpO
2
measurements and settings are available to view or change.
And also have different performance, please refer to "Technical specification" for more details.
For Masimo SpO
2
, possession or purchase of this device does not convey any express or
implied license to use the device with unauthorized sensors or cables which would, alone, or in
combination with this device, fall within the scope of one or more of the patents relating to this
device.
Masimo SpO
2
is covered under one or more of the following U.S.A. patents: 5,758,644,
6,011,986, 6,699,194, 7,215,986, 7,254,433, 7,530,955 and other applicable patentslisted at:
www.masimo.com/patents.htm
Figure 13-1 Pulse oximetry measurement connector
Pulse
oximetry
connector