Smiths Medical Pneupac babyPAC 100, Руководство пользователя

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504-2056A 15
NOTE: Oxygen concentrations – The user should be aware that the oxygen concentration could
be as low as 93%, when the ventilator is set at a high ventilation frequency and the 100%
O
2
position.
NOTE: Although the babyPAC ventilator is extremely economical in its use of supply gas the
actual gas usage will depend on the combination of settings selected. To assist the user,
therefore, settings which result in high gas usage are marked on the control panel with red.
These settings are, in general, also the settings which are best avoided if possible in
situations where gas consumption is an important operational consideration.
7. Function Selector Switch
This five position rotary switch is used to select one of the four operating modes of the
babyPAC ventilator and is also used to switch off the ventilator.
In the CMV* + PEEP* position, the ventilator will cycle as set by the T
INS
and
T
EXP
controls and at a pressure set by the inflation pressure control. The oxygen
concentration and PEEP controls are operative in this mode. Flow is delivered to the patient
circuit during the inspiratory period but is cut off during the expiratory period in order to
economise on the utilisation of the compressed gas. PEEP pressure is maintained by the
patient’s expiratory flow passing through the expiratory valve.
NOTE: With this method of operation PEEP may not be achieved if, during testing, the ventilator
is run with the patient connector occluded manually. PEEP will be achieved once a test
lung, with both resistance and compliance, is attached.
In the CPAP* position, the babyPAC ventilator delivers a constant flow of 10 L/min to the
breathing system and excess gas is vented to atmosphere at the exhalation valve. The
breathing system pressure is maintained at the constant pressure as set by the CPAP pressure
control and is continuously displayed on the pressure manometer.
In the CMV + ACTIVE PEEP* position, the ventilator operates as described under CMV +
PEEP but the ventilator flow in the patient circuit is maintained throughout the expiratory
period. This provides a PEEP that is less dependent on the lung characteristics of the
patient, but the use of this mode will increase gas consumption by up to 80%.
In the IMV* + CPAP* position, the expiratory time set on the scale is increased by a factor
of 10. The CPAP function is present during the extended exhalation period. The inspiratory
time and inflation pressure remain as under CMV and the CPAP pressure and oxygen
concentration are as set by their controls.
NOTE: The electronic alarm system is only operative when ‘CMV + PEEP’ or ‘CMV + ACTIVE
PEEP’ is selected.
8. PEEP/CPAP Control
This calibrated rotary control has a dual function. When CMV modes are selected the
control gives continuous adjustment of the pressure in the breathing system during the
expiratory phase and hence sets the pressure achieved at the end of expiration. When CPAP
or IMV+CPAP is selected then this control gives continuous adjustment of the constant
positive pressure in the breathing circuit.
As this setting will be slightly affected by the particular patient and ventilator settings this
control is not calibrated so in both modes the patient manometer must be used as the
reference for the set pressure.
The PEEP/CPAP control has a click-action at pressure settings above 10 x100Pa (10
cmH
2
O) in order to give a tactile warning that high levels are being selected. There is a
corresponding red sector on the panel scale