Olympus UHI-4 - Relief Mode

96
Chapter 5 Operation
HIGH FLOW INSUFFLATION UNIT UHI-4
5.13 Relief mode
When the cavity pressure exceeds the set value by 5 mmHg or more, the relief
mode is activated to open the channels inside the instrument automatically and
release the internal gas 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 devices 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. In these
cases, 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, caution
lamp 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.
• When relief mode is set to ON, the intra-cavity gas will flow
backward into the equipment for relief through the built-in
valve. To prevent the internal surfaces of the equipment from
being contaminated, be sure to use a disposable filter. When
no filter is used, make sure relief mode is set to OFF.
• Do not re-use the filter to prevent the risk of infection.