Getinge Maquet FLOW-i 4.2 User Manual

5.1.3 Safety functions in FLOW-i to avoid
potential hypoxia
To prevent the oxygen concentration in the
breathing circuit from becoming too low and
potentially causing hypoxia, the system has
two features; O
2
Guard and the Safety Flush.
O
2
Guard
During a patient case, exhaled gas from the
volume reflector and fresh gas from the
system are mixed in the breathing circuit. This
results in an oxygen concentration in the
breathing circuit that is lower than the set
oxygen concentration.
During low flow anesthesia the oxygen
concentration in the total inspiratory flow may
decrease over time. This may result in a
situation whereby the inspiratory oxygen
concentration becomes so low that the patient
experiences hypoxia.
If the system detects an inspiratory oxygen
concentration below a certain level (see image
below), it will initiate several actions to mitigate
the situation. The gas mix is set to Air/O
2
, the
fresh gas flow and oxygen concentration are
both adjusted. A dialog window appears
informing of the alterations. These changes
remain in effect until new settings are made.
The trigger level is always lower than the
relevant alarm, 'FiO
2
: low, thus avoiding
interference.
Safety flush
If the inspiratory oxygen concentration falls
even lower, possibly due to gas delivery
malfunction, then the system performs a safety
flush replacing the entire breathing circuit
volume with gas containing a high oxygen
concentration. In addition, the fresh gas flow
and O
2
concentration are increased to
predefined values. These actions are
accompanied by a dialog window informing
of the changes.
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FLOW-i 4.2, User's Manual
| 5
| System functionality |

Getinge Maquet FLOW-i 4.2 Specifications

General

Brand	Getinge
Model	Maquet FLOW-i 4.2
Category	Medical Equipment
Language	English