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If a heated water humidifier is used the user must provide a suitable circuit (heated if necessary) and
it must be remembered that the pressure monitor indicates the VBS pressure at the ventilator. When
the recommended circuits are used then the inspiratory pressure is accurately displayed, but if
circuit components are introduced that have measurable flow resistance then the consequent
pressure drop will give a corresponding error in the displayed pressure.
Any humidifier used must conform to EN ISO 8185 : 1995 and be designated as suitable for use
with neonatal/paediatric ventilators.
(d)
Manual Ventilation
If, temporarily, it is required to control the patient's ventilation manually this may be done by
disconnecting the patient circuit at the 22/15mm connector at the exhalation valve and selecting the
CPAP function on the selector switch. Inflation will be achieved each time the 15mm connector on
the circuit is occluded. Pressure will be limited by the upper patient inflation pressure limitation
device and the audible alarm will sound.
In this mode the oxygen selector remains operative but the CPAP pressure selector becomes
inoperative.
The operator must maintain constant observation of the patient pressure
WARNING:
manometer when using the ventilator in this manner to ensure that over-inflation is
avoided.
(e)
Gas Usage
The babyPAC ventilator has many special design features to minimise supply gas usage so that
maximum gas cylinder endurance is achieved. The minimum gas consumption is obtained in the
CMV+PEEP mode with only one gas being supplied and with minimum setting on oxygen
concentration scale (white) selected. In this setting 2/3rds of the gas flow in the patient circuit
during the inspiratory phase is ambient air and the compressed gas usage will be most economical.
As the oxygen concentration is increased towards 100% (oxygen supply only) or 70% (with oxygen
and air supplies) so the gas usage will rise to approximately double that at the minimum.
Using the "CMV + ACTIVE PEEP", the "CPAP" and the "IMV + CPAP" modes the gas
consumption will be up to 80% higher than when using the "CMV+PEEP" mode. Maximum
consumption will be about 11 L/min at the 100% and 70% oxygen settings respectively. At the
45% (approx.) and 21% settings the consumption will reduce to less than 6 L/min.
(f)
Use with MRI (MR Compatibility)
The ventilators covered by this manual have been type tested and have been assessed to be MR
Compatible when placed in a magnetic field of 3 Tesla and a field gradient of 430G/cm. Full details
of the tests are given in Section 8(g).
Although, as recommended by FDA guidelines, the ventilator was tested at the most extreme field
strengths and gradients, both of which were within the bore of the magnet, good ventilation practice
would dictate that the ventilator control module is always placed outside of the bore so that the
monitoring can be properly observed and the controls can be adjusted as necessary. This is the
intended position of use of the ventilator. Recommended practice is to fix the ventilator to the end
of the couch, with eg Velcro strapping, to prevent it falling off whilst the patient is being moved.
The patient circuit can be suitably extended by adding one or two additional lengths of smooth bore
patient hose of the type supplied with the ventilator, using suitable connectors. (Corrugated hosing
504-2056A
29
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