Chapter 5 Operation
89
HIGH FLOW INSUFFLATION UNIT UHI-4
• Always connect to a suction pump with a capacity of at least
40 L/min (at 0C, 101.3 kPa) and adjust to
–400 to –300 mmHg.
• The cavity pressure may become unable to be maintained
depending on the combination of equipment.
• If the patient is a child whose cavity volume is small, the
cavity pressure will fluctuate greatly. Do not use the smoke
evacuation function in such cases.
• If smoke evacuation continues for an extended period of
time, a large amount of CO
2
will be exchanged and the
patient’s body temperature may drop. Always prepare
temperature monitoring equipment and closely observe the
patient’s body temperature and other parameters. Also
observe the volume indicator to monitor the amount of CO
2
used during the operation.
• Confirm that the suction tube is securely attached. If the
suction tube becomes disconnected, CO
2
discharge will not
be possible. In this case, further supply of CO
2
will increase
the cavity pressure.
• Connect the suction tube after the insufflation tube has been
connected. If only the suction tube is connected, smoke
evacuation and the automatic suction function will cause the
cavity pressure to drop and the pressure cannot be restored
by insufflation.
• When the output from the electrosurgical generator or
ultrasonic generator is started before connecting the suction
tube, the cavity pressure may rise because only the
insufflation is performed. In this case, set the flow rate mode
to “Low” or press the insufflations switch to stop insufflation
and stop the smoke evacuation temporarily.
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