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Chapter 5 Operation
HIGH FLOW INSUFFLATION UNIT UHI-4
5.14 Automatic suction function
When the cavity pressure has exceeded the set value by 5 mmHg for more than
10 seconds, the automatic suction function is activated to perform suction until
the cavity pressure drops to the set value.
• To prevent gas embolism caused by intra-cavity
over-pressurization from the combined use of an insufflator
and a laser device, argon-enhanced coagulator, or other gas
supply devices, carefully read and understand the following
before using.
When performing endoscopy using the insufflator and a
laser device, argon-enhanced coagulator, or other gas
supply devices simultaneously, both instruments become
a source of supply for gas. Accordingly, the desired
pressure in the cavity is reached in a shorter time than
when a pneumoperitoneum device is used alone. Be
careful that the cavity does not become over-pressurized.
The laser device, argon-enhanced coagulator, and other
gas supply devices are not equipped to monitor the cavity
pressure (automatic termination of insufflation, warning
light or alarm). Although the insufflator is equipped with
these functions, it does not always prevent gas embolism
inasmuch as this depends on the patient and the
condition of the infected area. We ask that the physicians
make a suitable judgment from a professional standpoint.
If the insufflator emits a warning (warning light or alarm)
for intra-cavity over-pressurization, quickly open the
stopcock or valve of the trocar. In this event, reduce the
amount of outflow from the laser device, argon-enhanced
coagulator, or other gas supply device.
If use is continued while the alarm is sounding, there is a
risk of gas embolism due to intra-cavity
over-pressurization.
• Never connect the suction tube and the insufflation tube to
the same veress needle or trocar. Doing so will impede
measurement of the cavity pressure which may result in
excessive cavity pressure, or make it impossible to maintain
the selected cavity pressure.
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