The detachable snare designed by Hachisu [1] is a useful and safe instrument for preventing hemorrhage during and after endoscopic
polypectomy for large pedunculated polyps in the colon.
When the detachable snare is being handled, it is important to ensure that it is sufficiently
tight when ligating the polyp stalk. If it is too tight, the polyp is transected by
the detachable snare alone. If it is not tight enough, the snare can become dislodged,
leading to bleeding. Tightening is carried out on the basis of manual assessment by
the assistant holding the handle, and depending on the extent of the color change
in the polyp caused by congestion. However, it is difficult to select the degree of
tightening required.
We devised a method of placing a mark on the silicon stopper from which the loop tightens
around the stalk (Figure [1]). This mark can be made easily with a pen; we use a red pen, but any conspicuous
color can be used. Using this method, the degree of tightness can be confirmed from the marking, in addition to the conventional
method of assessing the manual sensation and the color of the polyp (Figure [2]). Using the monitor, the operator and assistant can confirm and agree on the tightness
of the loop. The tightening maneuver is observed more easily than when the polypectomy
is carried out without marking.
Figure 1 Placing a red mark on the stopper portion of the detachable snare.
Figure 2 The detachable snare has been placed over a polyp that has a long stalk. b The red mark can be seen biting into the stalk of the polyp (arrow).
Using simple pen marking, this method allows safer polypectomy with detachable snares
and may be regarded as a useful additional technique.
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