Chapter 5 Operation
81
HIGH FLOW INSUFFLATION UNIT UHI-4
5.5 Setting the flow rate
• Adjust the flow rate setting and smoke evacuation mode in
accordance with the cavity volume. For children, whose
cavity volume is small, insufflation at a high flow rate may
cause the cavity pressure to exceed the set pressure.
• When a veress needle is used, select LOW flow mode before
insufflation. Insufflation in other modes is dangerous because
the cavity pressure may exceed the set pressure.
1. Select the flow rate mode using the flow rate mode selector switch. Select
one of the three modes including “Low”, “Medium”, and “High”.
2. Set the flow rate to the desired value using the “+” or “–” flow rate setting
switch. Pressing “+” increases the set value and pressing “–” decreases it.
The table below shows the flow rate when smoke evacuation
is performed. Flow rate varies depending on the flow
resistance of the connected instrument. This table shows
flow rate when low-flow-resistance instruments are
connected to the insufflation tube. Accordingly, the actual gas
flow rate may not conform exactly to the figures in the table.
To keep insufflation safer, the UHI-4 controls the gas flow
during the first 25 seconds after the flow starts. Therefore,
the actual flow rate of the gas might not reach the maximum
flow rate for up to 25 seconds.
Cavity mode Flow rate mode Gas flow rate (L/min)
NORMAL
HIGH
MED
LOW
20 – 45
1.1 – 1.9, 2 – 5
0.1 – 1.0
SMALL
HIGH
MED
LOW
6 – 10
1.1 – 1.9, 2 – 5
0.1 – 1.0
Table 5.3
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