Mindray SynoVent E5, Operator'S Manual

Page: 142 / 196

11-12
11.10 Water Build-up in the Flow Sensor
11.10.1 Prevent Water Build-up
The patient’s exhaled warm and moist gas is condensed all the way when it flows along the
expiratory hose. The condensed water remains on the hose wall and finally enters the water
trap. When the patient’s exhaled gas arrives at the expiration valve, it is not easily condensed
in the expiration valve assembly since the heater is heating the expiration valve all the time.
If the heater, however, malfunctions, or is not working efficiently, condensed water may also
appear at the expiration valve and expiratory flow sensor, compromising the accuracy of
measured values.
Check the expiratory flow sensor when abnormal flow waveform or unstable tidal volume
fluctuation is detected. Check the sensor for water. If there is water build-up, clear it before
use.
To prevent water build-up, solutions are:
1. Water condensation in the flow sensor can be eased using a filter between the expiratory
hose and expiration valve.
2. Check the water trap for water during the use of the ventilator. If there is water build-up,
clear it without delay.
11.10.2 Clear Water Build-up
The water built up inside the flow sensor will result in inaccurate measured values of tidal
volume.
If there is water built up inside the flow sensor, remove the sensor and clear the water. Then
reinstall the sensor for use.
WARNING

Check water build-up inside the flow sensor every time before system use. Pooled
water in the flow sensor causes erroneous readings.

Make sure that all breathing system parts are dry every time when the breathing
system is cleaned and disinfected.