Pentax EG-2990i Instructions For Use Manual page 25

CAUTION:
It may be necessary to repeat the steps above several times to obtain
proper water jet function.
If water still does not flow properly after several attempts, contact your
local PENTAX service facility.
Do NOT apply excessive force or use a sharp object in an attempt to
unblock a clogged channel as it could result in endoscope damage.
f) In place of manual flushing via syringe, specially designed irrigator pumps
intended for endoscopic irrigation may be used via the PENTAX water jet
system. PENTAX check-valve mechanisms should always be connected and
positioned within the water jet channel pathway. Always use the lowest irrigator
pump setting as the procedure requires and increase water flow rates as patient
conditions allow.
WARNING:
Although the water jet system may not be clinically used during each
procedure, because the water jet channel of the endoscope enters the
body cavity, it can be contaminated the same way as the insertion
portion of the endoscope. Therefore, it still MUST be properly cleaned and
subjected to the same disinfection/sterilization processes as other internal
channels of the endoscope.
NOTE:
The water jet system featured in PENTAX endoscopes should not be
confused with "auxiliary" or manual water feed systems whose function
is simply to clean the distal objective lens. A true water jet allows the
endoscopist to direct a forceful stream of water to clear blood, debris, etc.
from a particular area of interest to improve visualization.
(1)
(2)
Figure 2.13
– 20 –
(1) Water Jet water shoots straight
out to area of interest
(2) Auxiliary Water System water
is directed across endoscope
tip to clean lens