Welch Allyn PROPAQ CS - Manual (Page 130)

126 Technical overview Welch Allyn Propaq CS Vital Signs Monitor
Capnography (CO
2
) description
Two capnography (CO
2
) monitoring options are available—the Mainstream-sampling CO
2
option (MCO
2
) and the Sidestream-sampling CO
2
option (SCO
2
).
Both Mainstream CO
2
and Sidestream CO
2
options are available in one product. However,
only one sampling method may be monitored at any time—simultaneous monitoring of
MCO
2
and SCO
2
is not supported.
The Mainstream CO
2
Board (MSP Board) supports all Mainstream and Sidestream
applications and is the major interface between the printer and SpO
2
hardware in certain
configurations of the Expansion Module. The MSP Board replaces the SCP Board in SpO
2
applications with CO
2
. For Sidestream-only applications, an MSP Board version without
Mainstream hardware is used. For both Mainstream and Sidestream applications, the
MSP Board is mounted within the rear panel of the Expansion Module housing.
Mainstream CO
2
Option. In the Mainstream sampling method, the CO
2
analysis
chamber (commonly referred to as the “bench”) is an integral part of the Mainstream
sensor which is located in-line, between the patient’s airway and the ventilator circuit
via an airway adapter. The patient’s expired gas is sampled directly from the patient’s
airway. The MSP Board interfaces the external Mainstream sensor to the monitor.
Sidestream CO
2
Option. In the Sidestream sampling method, the bench is located on
the Stick Board within the monitor. A sample of the patient’s expired gas is aspirated
from the airway and is drawn to the bench through a sampling line containing a water
trap. The Stick Board also contains pneumatic tubing that connects to the SSP Board.
The Stick Board is mounted on the Sidestream Processor Board assembly (SSP
Board) which interfaces the Stick Board to the monitor. The SSP/Stick Board assembly
is mounted within the front bezel of the Expansion Module housing of the monitor.
System Interface. The SSP Board power and communication is obtained via the extender
board that connects to the MSP Board. The extender board routes datalines from the
MSP Board and contains additional power supplies for powering the SCO
2
Boards.
The Mainstream CO
2
Board (MSP Board) is the major interface connection between
several subsystems in the Expansion Module. This circuit board connects directly to the
expansion connector, providing a direct interface to a monitor Display Processor system.
The MSP Board also supports:
• Mainstream CO
2
• an interface to the SpO
2
system
• an interface to the Printer option
• an interface to Sidestream CO
2