Taewoong Niti-S Tracheal Uncovered Stent Manual Del Usuario página 6

b) The Internal luminal diameter should be measured exactly
with endoscope and/or fluoroscope.
Stent Size Determination
a) Measure the length of the target stricture.
b) Select a stent size that is 20 to 40mm longer than the
measured length of the stricture in order to cover fully both
ends of the lesion.
c) Measure the diameter of the reference stricture - it is
necessary to select a stent which has an unconstrained
diameter about 1 to 4mm larger than the largest reference
target diameter, to achieve secure placement.
Stent Deployment Preparation
- The Niti-S Stent can be placed with the aid of fluoroscopy,
and/or endoscopy.
- Pass a 0.035" (0.89 mm) guidewire to the level of the
stricture.
- Pass a 0.038" (0.97 mm) guidewire to the level of the
stricture.
A. 12Fr. or less introducer system
a) Under the endoscopic guidance, insert an endoscope to the
level of the obstruction, then introduce the guide wire
through the working channel of the endoscopy. Advance until
the guide wire across the target stricture to where the stent
introducer system will be placed over the guide wire.
b) Remove the stylet from the distal end of the introducer.
c) Ensure that the valve of Y-connector connecting the inner
sheath and outer sheath is locked by rotation proximal valve
end in a clockwise direction to prevent premature stent
deployment.
d) Flush the inner lumen of introducer system.
B. 14Fr. or more introducer system
a) Remove the stylet from the distal end of the introducer.
b) Under the fluoroscopy guidance, insert a guide wire across
the stricture to where the stent introducer system will be
placed over the guide wire.
c) Ensure that the valve of Y-connector connecting the inner
sheath and outer sheath is locked by rotation proximal valve
end in a clockwise direction to prevent premature stent
deployment.
Stent Deployment Procedure
PRECAUTION: Do not twist introducer system or employ a
boring motion during the deployment as this may affect
positioning and ultimate function of stent
a) Under the fluoroscope and/or endoscopic guidance, position
the introducer system to the center of the target stricture
exactly.
b) Once the introducer system is in the correct position for
deployment, unlock the proximal valve of the Y-connector by
turning the valve more than twice in an anti-clockwise
direction.
c) To begin stent deployment, immobilize the hub in one hand
and grasp the Y-connector with the other hand. Gently slide
the Y-connector back along the pusher towards the hub.
d) When the center X-ray marker reaches the center of target
stricture, continue pulling back on the Y-connector until the
stent is fully deployed. (See figure 4, 5)
Figure 4