JP4761597B2 - Endoscopic high-frequency snare - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope high-frequency snare that is used to cut a polyp through a treatment instrument insertion channel of an endoscope.
[0002]
[Prior art]
In general, a high-frequency snare for an endoscope has an operation wire inserted in a flexible sheath so as to be movable back and forth in the axial direction, a snare loop made of an elastic wire is connected to the tip of the operation wire, and the operation wire is connected in the axial direction. The snare loop moves into and out of the distal end of the flexible sheath by moving back and forth, and the snare loop is swollen by its own elasticity outside the flexible sheath and is narrowed by being pulled into the flexible sheath. It has become.
[0003]
When in use, the polyp is surrounded by the snare loop, and then the operation wire is pulled to bind the polyp 100 with the snare loop 3 as shown in FIG. The polyp 100 is cauterized and cut.
[0004]
[Problems to be solved by the invention]
However, in the case where the snare loop 3 is formed by bending back one elastic wire into a substantially U shape at the tip of the loop, for example, when the polyp 100 is bound with the snare loop 3 as shown in FIG. Since the blood vessel 101 passing through the polyp 100 is far from the distal end portion 3a of the snare loop 3, the blood vessel 101 is cauterized and cut in the last moment, so that the blood vessel 101 is not cauterized. There was a case that bleeding was caused after surgery.
[0005]
Therefore, an object of the present invention is to provide an endoscopic high-frequency snare capable of reliably cauterizing a blood vessel passing through a polyp and cutting the polyp so as not to bleed after the operation.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope high-frequency snare according to the present invention has an operation wire inserted and disposed in a sheath so as to be able to advance and retreat in the axial direction, and a snare loop capable of supplying a high-frequency current is substantially at the tip of the loop. It is formed by a single elastic wire bent back into a U-shape and connected to the tip of the operation wire. By operating the operation wire to advance and retract in the axial direction, the snare loop enters and exits the tip of the flexible sheath. In a high-frequency endoscopic snare for an endoscope in which the snare loop is swollen by its own elasticity outside the flexible sheath and is narrowed by being pulled into the flexible sheath, the distal end portion of the snare loop is At a position close to the distal end, it is displaced from the front of the distal end of the sheath, and is pulled between the distal end and the proximal end of the snare loop to the extent that it is pulled into the sheath by pulling the operation wire. It is obtained by different lengths of the left and right sides of the elastic wires.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an endoscopic high-frequency snare according to an embodiment of the present invention. Reference numeral 1 denotes a flexible sheath made of, for example, an electrically insulating tetrafluoroethylene resin tube. There is no endoscope inserted into the treatment instrument insertion channel.
[0008]
A flexible conductive metal operation wire 2 is inserted through the entire length of the flexible sheath 1 so as to be movable back and forth in the axial direction, and can be freely advanced and retracted from the proximal end side by an operation portion not shown. Operated.
[0009]
A snare loop 3 formed by bending a single conductive elastic wire is connected to the distal end portion of the operation wire 2 via a connection pipe 4, and a high-frequency current is connected to the snare loop 3 via the operation wire 2. Can be energized. However, the operation wire 2 may be formed by extending the snare loop 3.
[0010]
The elastic wire forming the snare loop 3 is formed of, for example, a stranded wire of a stainless steel wire. When no external force is applied, the elastic wire is a substantially oval loop extending several centimeters as shown in FIG. Form.
[0011]
Then, the snare loop 3 can be elastically deformed by applying an external force and can be constricted, and can be constricted by pulling the operation wire 2 to the proximal side and drawing it into the flexible sheath 1.
[0012]
The snare loop 3 is formed by bending back one elastic wire in a substantially U shape at the tip portion of the loop, and the lengths of the left and right elastic wires between the tip and the base end of the snare loop 3 are different. is doing. That is, L> R in FIG.
[0013]
As a result, as shown in FIG. 2, the operation wire 2 is pulled toward the proximal side, and most of the snare loop 3 is drawn into the flexible sheath 1, and the tip portion 3 a of the snare loop 3 is moved from the outside. When approaching the distal end of the flexible sheath 1, the longer elastic wire of the snare loop 3 is bent, and the distal end portion 3 a of the snare loop 3 is displaced from the front of the distal end of the flexible sheath 1. .
[0014]
However, if the difference between the left and right lengths L and R of the elastic wire forming the snare loop 3 is too large, the longer elastic wire is greatly loosened and flexible, as shown by a two-dot chain line in FIG. The snare loop 3 cannot be completely drawn into the flexible sheath 1 by being caught at the entrance of the sheath 1.
[0015]
Therefore, the difference between the left and right lengths L and R of the elastic wire forming the snare loop 3 is that when the operation wire 2 is pulled toward the hand side, as shown in FIG. 3a is set within a range that is completely drawn into the flexible sheath 1.
[0016]
When the polyp 100 is cut by the endoscope high-frequency snare of the embodiment configured as described above, the operation wire 2 is pulled after the polyp 100 is surrounded by the snare loop 3, and FIG. The polyp 100 is bound with the snare loop 3 as shown in FIG.
[0017]
Then, as shown in FIG. 4, since the distal end portion 3 a of the snare loop 3 is displaced from the front of the distal end of the flexible sheath 1, the blood vessel 101 passing through the vicinity of the center of the stem portion of the polyp 100. On the other hand, the longer elastic wire of the snare loop 3 contacts earlier, so that the polyp 100 is completely cut after the blood vessel 101 is cauterized to such an extent that bleeding does not occur.
[0019]
【The invention's effect】
According to the present invention, the tip of the snare loop is bent so that the tip portion of the snare loop bent back in a substantially U shape is displaced from the front of the tip of the sheath at a position approaching the tip of the sheath from the outside. By making the lengths of the elastic wires on both the left and right sides different from the proximal end, the blood vessel passing through the polyp was brought into contact with the snare loop early to ensure that the blood vessel was cauterized, and bleeding occurred after the operation. The polyp can be safely cut so that there is no.
[Brief description of the drawings]
FIG. 1 is a plan sectional view of a distal end portion of a high-frequency endoscope snare according to an embodiment of the present invention.
FIG. 2 is a plan sectional view showing a state in which most of the snare loop of the high-frequency endoscope snare according to the embodiment of the present invention is drawn into the flexible sheath.
FIG. 3 is a plan sectional view showing a state in which the snare loop of the endoscope high-frequency snare according to the embodiment of the present invention is completely drawn into the flexible sheath.
FIG. 4 is a plan sectional view showing a state in which a polyp is cut by the endoscope high-frequency snare according to the embodiment of the present invention.
FIG. 5 is a perspective view showing a state in which a polyp is cut by an endoscope high-frequency snare.
FIG. 6 is a plan sectional view showing a state in which a polyp is cut by a conventional endoscope high-frequency snare.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Operation wire 3 Snare loop 3a Tip part 100 Polyp 101 Blood vessel

Claims (1)

An operation wire is inserted and arranged in the sheath so as to be able to advance and retreat in the axial direction, and a snare loop capable of supplying a high-frequency current is formed by a single elastic wire bent back in a substantially U shape at the tip of the loop. The snare loop is moved into and out of the distal end of the flexible sheath by moving the operation wire forward and backward in the axial direction, and the snare loop is elastically elastic outside the flexible sheath. In a high frequency snare for an endoscope which is swelled and narrowed by being drawn into the flexible sheath,
The snare loop is formed in a substantially oval shape outside the sheath, and
When the portion other than the vicinity of the tip of the snare loop is drawn into the flexible sheath and the tip portion of the snare loop approaches the tip of the sheath from the outside, the tip of the snare loop is The snare has a substantially oval shape so that the snare loop is completely retracted into the sheath when the operation wire is pulled from the proximal end side when the operation wire is pulled from the front side of the front end opening. An endoscopic high-frequency snare, wherein the lengths of elastic wires on the left and right sides between a distal end and a proximal end of a loop are made different from each other .

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