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Chapter 14
Capnograph and Ventilator
Overview
The microCapStar Capnograph provides accurate end-tidal or continuous measurement
of expired CO
in animals as small as mice.
It features very low sample flow
2
requirements, rapid response time and long term stability.
The CO
waveform,
2
respiration rate, end-tidal CO
and minimally inspired CO
are measured, displayed
2
2
and recorded along with all other available physiological monitoring parameters. The
CO
waveform, end-tidal CO
and minimally inspired CO
can be displayed in either
2
2
2
mmHg, kPa or percent.
The MR-compatible Ventilator consists of a Ventilator Control Unit and a MR-compatible
Valve Assembly. The valve assembly is positioned in the magnet bore close to the
animal. The Ventilator Control Unit works on the flow-time principle. An inspiratory
airflow is delivered to the animal for a known time resulting in a known air volume. This
approach provides great flexibility.
A wide range of volumes, breaths/minute and
Inspiration/Expiration ratios are possible without additional hardware and using just
three controls: respiration rate, percent inspiration and flow rate.
The Capnograph and Ventilator options can be used individually. However, in most
cases they are used together.
Ventilation requires intubating the animal.
Once
intubated it is easy to attach sample lines for the Capnograph.
Ventilator MR-compatible Valve Assembly
The MR-compatible Valve Assembly incorporates
two
high
speed,
miniature
pneumatically
activated,
non-metallic
valves
to
direct
air
between the animal and vent ports. Locating the
valves close to the animal in the magnet bore
improves performance by minimizing dead space
and tubing compliance.
The
MR-compatible
Valve
Assembly
allows
inspiratory air or anesthetic gas to be delivered to
the animal during inspiration. During expiration,
the valves switch to vent the inspiratory airflow
and to allow the lungs to vent passively to the
atmosphere. The valves allow inspiratory air to
flow continuously preventing pressure transients
that would result from starting and stopping the
flow of air.
Revision C, August 2013
14-1
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