Contec Medical Systems Co. CMS8000, User Manual

Page: 99 / 133

- 92 -
Chapter16 CO
2
Measuring(optional)
16.1 General
This chapter offers some relevant data concerning CO
2
monitoring.
The monitor provides two kinds of CO
2
measuring methods as per the requirements of users,which are MainStream
and SideStream.
The module is used to monitor continuous carbon dioxide and report the End Tidal carbon dioxide (ETCO
2
), Inspired
CO
2
(InsCO
2
) and Air Way Respiratory Rate(AWRR) values of the intubated and non-intubated adult,
pediatric ,infant and neonatal patient.
CO
2
: EtCO
2
INS: Inspired Minimum CO
2
(InsCO
2
).
AWRR: Air Way Respiration (AwRR)(Resp. times/MIN).
Note

Before use, if the measurement is MainStream,you must set the "work mode" to "measure"in the submenu
"OTHER SET" of "CO
2
SETUP",otherwise the module will not work correctly.
 Don’t use the device in the environment with flammable anesthetic gas.

The device can only be operated by personnel having taken professional training and familiar with this
manual.
Warning

CO
2
module shall be avoided from crash and vibration.

Do not operate the CO2 Module when it is wet or has exterior condensation.

Do not connect the exhaust tube to the ventilator circuit.

This product and its accessories are latex free.

DO NOT use device on patients that can not tolerate the withdrawal of 50 ml/min +/- 10 ml/min from the
airway or patients that can not tolerate the added dead space to the airway.
16.2 Monitoring Procedure
16.2.1 Principle of operation
The measurement of this module is based on the feature that the CO
2
molecule absorbs 4.3um infrared ray. The
measurement procedure is as follows : send the CO
2
to a measurement chamber inside the module through the airway
system, and then irradiate infrared ray at one side of the chamber and use the sensor to measure the attenuation degree
of the received infrared ray at the other side. Since the attenuation degree of the infrared ray is proportional to the
concentration of CO
2
, the CO
2
concentration is calculated.
The relation between the partial pressure and the CO
2
concentration is given below:
CO
2
partial pressure (mmHg) =CO
2
concentration (%) × Pamp (ambient pressure, mmHg)
Of CO
2
MainStream and CO
2
SideStream modules, whichever is selected by the user,autorun measuring mode is
adopted.
16.2.2 Operation for CO
2
Measurement

Sidestream
Figure 16-1 Sample Canula