HOW IT WORKS
Using a Rodent Ventilator with a Traditional
In recent years, new styles of highly
sophisticated rodent ventilators have made
their way to the market, creating a variety
of choices based on your application.
There can be a great deal of confusion
and consternation when it comes to using
ventilators with a traditional rodent anesthesia machine, especially due to the extreme
variation in models and modes of operation.
A rodent ventilator requires extremely
small volumes of anesthetic gas. In addi-
tion, gas demand “pulses” as the valves
inside the ventilator operate. Thus, a
vaporizer cannot be connected directly
to the inlet of the ventilator. The gas feed
must be split to allow small amounts of
extra gas to “bypass” the ventilator as
well to prevent back pressure pulsation on
the vaporizer. This bypass configuration
also ensures that changes to the anes-
thetic concentration at the vaporizer are
immediately applied to the animal instead
of waiting for the ventilator to slowly con-
sume gas inside the circuit. For this rea-
son, tubing diameter and lengths should
be kept to the smallest possible size when
building the circuit.
Exhaust gas from the ventilator and
surplus from the bypass are then tied
together so that all waste is captured by
a single carbon filter. The one-way check
valve in the circuit prevents exhaust gas-ses from being taken in by the ventilator.
Using the anesthesia machine with the
ventilator is very similar to working with
the average rodent mask. Flow should be
set to the lowest value that your vaporizer
will accommodate. The ventilator will
take in only what it needs, all additional
gas will flow past the ventilator. So, other
than operating the ventilator itself, no
additional steps are required.
For more information, go to
Pictured is the usual tube connection to a
rodent ventilator. It contains the following
A. Gas feed from the anesthesia machine
B. Ventilator gas input
C. One-way check valve
D. Ventilator exhaust output
E. Connection to carbon filter
The Allied Trade Association (ATA) has represented the interests of commer- cial organizations within the laboratory animal science and biomedical research
community since the 1950s. Details of ATA
membership are found on our website,
go2ata.org, along with the application form.
We have some noteworthy membership benefits set in place to support
exhibiting at the National AALAS meeting. The New Product Showcase is an
exclusive service only available to ATA
members; prominent displays at the
AALAS meeting provide a venue to promote your new products and services to
your target audience, driving additional
traffic into your booth space.
New since last year’s meeting is the
Small Exhibitor Resource, another exclusive
benefit offering smaller member organiza-
tions expertise in maximizing their AALAS
trade-show budget with one-on-one profes-
sional advice and creative strategies for the
best return on investment. share experience
and accumulated knowledge within our
Each year we welcome new members to
the ATA as they enter this specific research
market, and here we feature some brief
introductions to member companies.
ALFA WASSERMANN DIAGNOSTIC
For over 50 years, Alfa Wassermann instruments and products have been used in
clinical laboratories all over the world for a
wide range of diagnostic applications. Alfa
Wassermann is also a supplier to vaccine
manufacturers worldwide that provide the
production capacity necessary to cope with
Aquaneering is an international man-
ufacturer of Aquatic Housing used in
medical research for Zebrafish, Xenopus,
and other species. Aquaneering offers
knowledge of highly advanced filtration
technologies pioneered within the aqua-
culture industry and provides no mainte-
nance filters with undetectable levels of
ammonia and nitrites.
BRAINTREE SCIENTIFIC, INC.
Braintree Scientific has been supplying Lab Animal Research products and
equipment to the Life Science Industry
for 30+ years. We offer unique products
that are exclusive to Braintree Scientific,
as well as a complete selection of the
laboratory products you need and have
requested to make your research successful.
Teresa Woodger, ATA President, can be
reached at firstname.lastname@example.org.