KD Scientific 35 Ventilator - Manual (Page 11)

9
KDS35 Small Animal Ventilator
Pump Operation:
(continued)
SETTING VOLUME
The volume delivered is read by observing the excursion of the O-ring, on the piston, which is
closest to the valve block. This piston O-ring excursion is relative to the volume scale on the
outside of the cylinder wall. Volume change is accomplished while the Ventilator is running by
turning “volume” knob in the desired direction.
SETTING RATE
Adjust the “Rate” control until the desired rate appears on the LED display. Avoid running the
Ventilator at rates exceeding 150 breaths/min for periods in excess of 2 hours.
CAUTION - DO NOT OVER INFLATE THE ANIMAL. A GOOD RULE OF THUMB IS TO
OBSERVE THE DEPTH OF RESPIRATION IN THE NORMAL CALM UNANESTHETIZED
ANIMAL AND ADJUST THE VOLUME TO APPROXIMATE THIS RESPIRATION DEPTH
WHEN THE ANIMAL IS ATTACHED TO THE VENTILATOR.
USE OF GAS MIXTURE
It is possible to introduce non-explosive air/gas mixtures into the lower room air port.
However, the source of gas mixture is usually from a tank delivering gas is at a constant rate
while the Ventilator takes in air/gas intermittently. Some sort of buffer/expansion chamber
must be provided between the tank and the Ventilator. KD Scientific offers a connection kit
(73-0397) to depressurize the gas prior to entering the ventilator. This Ventilator is not
designed to take air/gas inputs under pressure.
CREATING A POSITIVE END-EXPIRATORY PRESSURE (PEEP)
To create a PEEP pressure when using the ventilator, simply connect a length of tubing to the
“Exhaust” port and submerge the other end in a column of water. There are two locations in
which the clip and cylinder can be installed - depending on the chosen orientation. The depth
of the end of the tubing (in cm) below the water surface will give the PEEP pressure in
cmH2O.