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38 Infant Flow ® SiPAP<br />
5 Make sure that the water trap is empty. If necessary, empty any water from the<br />
trap (refer to Chapter 3, Maintenance).<br />
6 Gas Flow Pressure Setting<br />
The IFSD provides a virtually constant airway pressure irrespective of patient<br />
demand or expiratory flows via the specially designed generator and nasal prongs. This<br />
is the reason for the IFSDs ability to provided superior NCPAP. The IFSD is subject<br />
to a direct relationship between controlled enriched gas flow and NCPAP pressure.<br />
A nomogram illustrating the relationship between constant airway pressure and flow<br />
settings is shown in Figure 10. Example: 8 L/min gas flow provides 5 cm H2O<br />
NCPAP.<br />
Note<br />
Individual devices have a tolerance of up to ± 10% from that illustrated in the<br />
nomogram and in particular, at pressures below 2 cm H2O.<br />
Figure 10 - Flow Pressure Nomogram<br />
675-120 Revision C November 2004
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