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Flow Sensor
37. The presence of secretion on the sensor mesh may cause increased resistance. Set
alarms closely to detect clinically significant changes.
38. When carrying out ET suctioning with the ventilator delivering high flow rates it is
possible to activate the sensor contamination alarm inadvertently. To avoid this situation
disconnect the ET manifold first from the flow sensor, then the flow sensor from the ET
tube. It is also important to reconnect the flow sensor and manifold in the reverse order
so as to again avoid the contamination alarm. For more information please refer to
“Circuit Disconnection Procedure” on page 138.
39. A new flow sensor is delivered clean, but not sterile. It should be autoclaved as
described in the Cleaning and Disinfection Procedures prior to initial use. Use only SLE
approved flow sensors (Part number: N5201).
40. Because a patient’s inspired gas comes into contact with the internal parts of the flow
sensor that can absorb disinfecting agents, be sure to disinfect the sensor according the
techniques described in “Cleaning and Sterilization” on page 184.
41. Repeated autoclave cycles may cause surface crazing which may only be cosmetic and
not affect performance or safety. Inspect the sensor for integrity following disinfection
and before each use. Discard and replace if significant structural cracking is noted.
4.2 Clinical Warnings
Failure to take corrective action when the alarms are activated could result in injury or death
to the patient.
There are risks inherent in the use of both conventional and high-frequency forms of
mechanical ventilation in the neonatal and paediatric patient. These may include:
1. Under- or over-ventilation (with consequent abnormalities in blood gases);
2. Incorrect humidification; could cause mobilisation of secretions and airway blockage.
3. Intracranial haemorrhage, cerebral ischaemia;
4. Chronic lung disease (bronchopulmonary dysplasia in the newborn);
5. Damage to trachea and bronchi;
6. Over- or under- inflation of the lung;
7. Atalectasis;
8. Air leak syndrome (pneumothorax, pneumomediastinum, pneumopericardium.
pulmonary interstitial emphysema);
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