22 - 2 BeneVision N22/N19 Patient Monitor Operator’s Manual
22.1 CO
2
Introduction
CO
2
monitoring is a continuous, non-invasive technique for determining the concentration of CO
2
in the
patient’s airway by measuring the absorption of infrared (IR) light of specific wavelengths. CO
2
has its own
absorption characteristic and the amount of light passing the gas probe depends on the concentration of the
measured CO
2
. When a specific band of IR light passes through respiratory gas samples, some of IR light will be
absorbed by the CO
2
molecules. The amount of IR light transmitted after it has been passed through the
respiratory gas sample is measured with a photodetector. From the amount of IR light measured, the
concentration of CO
2
is calculated.
CO
2
measurement are used to monitor the patient’s respiratory status. The following two methods are used for
measuring CO
2
:
â– Mainstream CO
2
measurement
Directly insert a CO
2
sensor into the patient's breathing system.
â– Sidestream/Microstream CO
2
measurement
Take a sample of the respiratory gas with a constant sample flow from the patient's airway and analyzes it
with a remote CO
2
sensor built into the Sidestream or MicrostreamCO
2
module.
For the sidestream CO
2
module, two types of oxygen sensors can be integrated: paramagnetic oxygen sensor
and galvanic oxygen sensor. The paramagnetic oxygen sensor measures oxygen relying on its paramagnetic
properties. The galvanic oxygen sensor measures oxygen concentration using the electrochemical method.
CO
2
monitoring is intended for adult, pediatric and neonatal patients.
The following modules are sidestream CO
2
module, microstream CO
2
module and mainstream CO
2
module from
left to right.
If you measure CO
2
using the AG module, see 23 Monitoring Anesthetic.
(1) CO
2
menu hard key (2) CO
2
Measure/standby hard key
(3) CO
2
watertrap seat (4) Gas outlet
(5) Sample line connector (6) CO
2
sensor connector
(1)
(2)
(4)
(3)
(1)
(5)
(4)
(1)
(6)
(2)
(2)
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