JP3983904B2 - Endoscopic high-frequency snare - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope high-frequency snare used for cauterizing and cutting polyps and the like with a high-frequency current.
[0002]
[Prior art]
A conventional high-frequency snare for an endoscope has a snare wire made of a conductive elastic wire that expands in a loop by its own elasticity at the tip of a conductive operation wire that is inserted and disposed in an electrically insulating sheath so as to be able to advance and retreat. When the snare wire is pushed out from the distal end of the sheath by the operation wire, it is configured to swell in a loop shape and to be elastically deformed and contracted when pulled into the sheath by the operation wire. From the proximal side of the sheath to the snare wire via the operation wire High frequency current can be applied.
[0003]
[Problems to be solved by the invention]
When polypectomy is performed endoscopically using an endoscopic high-frequency snare as described above, the stem of the polyp is lightly tightened with a snare wire, and the snare wire is placed in the sheath while applying high-frequency current to the snare wire. If pulled gradually, the polyp is cauterized by the high-frequency current flowing through the snare wire that is being constricted.
[0004]
However, when the polyp is cut in this way, the polyp is cut by the mechanical tightening force of the snare wire before the central part of the stem of the polyp that is cut from the outside due to the cauterization effect by the high-frequency current is not sufficiently cauterized. In some cases, it was caused to cause bleeding from the blood vessels in the center.
[0005]
Therefore, an object of the present invention is to provide a high-frequency endoscopic snare that can securely cut the stem of a polyp and the like to a central portion by high-frequency current without bleeding.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope high-frequency snare according to the present invention is configured such that an operation wire having a snare wire made of a conductive elastic wire spreading in a loop shape by its own elasticity is attached to the tip of an electrically insulating sheath. The snare wire is swelled in a loop when pushed out from the distal end of the sheath by the operation wire, and is elastically deformed and contracted when drawn into the sheath by the operation wire. An endoscopic high-frequency snare in which a high-frequency current can be applied to the snare wire from the proximal side of the sheath, wherein the tip portion of the snare wire is folded back toward the inside of the loop.
[0007]
Note that at the tip of the snare wire, one elastic wire is bent back into a U shape to form the loop, and the portion bent back into the U shape is folded back toward the inside of the loop. It may be.
[0008]
Alternatively, at the tip portion of the snare wire, two elastic wires are aligned and fixedly connected in parallel to form the loop, and the portion where the two elastic wires are aligned and fixedly connected is directed toward the inside of the loop. May be folded.
[0009]
Further, the portion folded back toward the inside of the loop may be on the same plane as the other portion of the snare wire, and the portion folded toward the inside of the loop is the other portion of the snare wire. It may be on a plane deviated from the plane including.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a distal end portion of an endoscope high-frequency snare according to a first embodiment of the present invention. Reference numeral 1 denotes a flexible sheath that can be inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown), and is formed of an electrically insulating tube such as a tetrafluoroethylene resin tube. .
[0011]
A flexible conductive metal operation wire 2 is inserted through the entire length of the sheath 1 so as to be movable back and forth in the axial direction, and is connected to the proximal end of the sheath 1 (not shown). Advancing / retreating by the operation from.
[0012]
A snare wire 3 made of a conductive metal and spreading in a loop shape by its own elasticity is connected to the distal end of the operation wire 2 via a connecting pipe 4 by soldering or the like. However, the snare wire 3 may be extended and the portion may be used as the operation wire 2.
[0013]
The tip portion of the snare wire 3 is folded back toward the inside of the loop. Reference numeral 5 denotes the tip folding portion. The snare wire 3 of this embodiment has a loop formed by bending a single elastic wire back into a U shape at the tip of the loop so that the state before folding is indicated by a broken line. The bent back part is folded back toward the inside of the loop.
[0014]
The endoscope high-frequency snare configured as described above pushes the operation wire 2 from the proximal side and pushes out the snare wire 3 from the distal end of the operation wire 2 as shown in FIG. When the operation wire 2 is pulled toward the hand side due to elasticity, the snare wire 3 is drawn into the distal end portion of the sheath 1 and elastically deformed into a constricted state.
[0015]
A well-known connection terminal for connecting the operation wire 2 to a high-frequency power source is provided on the operation unit side (not shown), and a high-frequency current can be supplied to the snare wire 3 through the operation wire 2 at any time. it can.
[0016]
When the polyp is excised transendoscopically using the high-frequency endoscope snare configured as described above, the sheath 1 is inserted into the treatment instrument insertion channel of the endoscope, and the stem of the polyp is inserted into the snare wire. After lightly tightening at 3, the snare wire 3 is gradually pulled into the sheath 1 while applying a high-frequency current to the snare wire 3 through the operation wire 2.
[0017]
Then, the snare wire 3 is narrowed while the polyp stem portion is cauterized from the outside, and as shown in FIG. 2, the snare wire 3 sandwiches the polyp stem portion 101 from both sides and simultaneously from the front side. The tip folding portion 5 is pressed against the stem 101 of the polyp.
[0018]
As the snare wire 3 is drawn into the distal end of the sheath 1 as shown in FIG. 3, the tip turn-up portion 5 quickly contacts the blood vessel 102 at the center of the stem 101 of the polyp. 102 is surely cauterized and the stem 101 of the polyp can be squeezed without bleeding. In this way, the polyp can be removed safely and quickly without mechanically cutting or puncturing the polyp.
[0019]
FIG. 4 shows the distal end portion of the endoscope high-frequency snare according to the second embodiment of the present invention, and only the shape of the distal end portion of the snare wire 3 is different from that of the first embodiment.
[0020]
That is, in this embodiment, at the distal end portion of the snare wire 3, two elastic wires are aligned and fixedly connected in parallel to form a loop, and the portion is folded back toward the inside of the loop to be folded at the distal end folding portion 5. Is formed.
[0021]
Even if comprised in this way, the effect similar to 1st Embodiment is acquired. In this embodiment, one wire short piece 6 is sandwiched between two elastic wires at the loop tip of the snare wire 3 to widen the width, but the two elastic wires are directly fixed. Alternatively, the fixing portion may be attached with a cylindrical tip.
[0022]
Further, in the first and second embodiments, the tip folding portion 5 is on the same plane as the other portions of the snare wire 3 forming the loop. However, as shown in FIG. You may deviate from the plane in which the other part of the snare wire 3 is included. Thereby, the center part (core part) of a desired cutting object can be cauterized at a position deviated from the plane of the loop formed by the snare wire 3.
[0023]
【The invention's effect】
According to the present invention, the distal end portion of the snare wire is folded back toward the inside of the loop, so that the distal end portion of the snare wire is folded back into the blood vessel at the center of the stem of the polyp as the distal end folded portion is drawn into the distal end of the sheath. Since the parts quickly contact each other, the central blood vessel is surely cauterized, and the stem of the polyp can be surely squeezed and squeezed to the central part by high-frequency current without bleeding.
[Brief description of the drawings]
FIG. 1 is a plan sectional view of a distal end portion of an endoscopic high-frequency snare according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional plan view of the distal end portion of the endoscope high-frequency snare according to the first embodiment of the present invention in use.
FIG. 3 is a plan sectional view of the distal end portion of the endoscope high-frequency snare according to the first embodiment of the present invention in use.
FIG. 4 is a plan sectional view of a distal end portion of an endoscope high-frequency snare according to a second embodiment of the present invention.
FIG. 5 is a perspective view of a distal end portion of an endoscope high-frequency snare according to a third embodiment of the present invention.
[Explanation of symbols]
1 Sheath 2 Operation wire 3 Snare wire 5 Tip folding part

Claims (5)

An operation wire having a snare wire made of a conductive elastic wire that expands in a loop shape by its own elasticity is inserted and disposed in an electrically insulating sheath so as to be able to advance and retreat, and the snare wire is inserted into the sheath by the operation wire. An endoscope configured to expand in a loop shape when pushed out from the distal end, and to be elastically deformed and contracted when pulled into the sheath by the operation wire so that a high-frequency current can be supplied to the snare wire from the proximal side of the sheath. High frequency snare
A high-frequency snare for an endoscope, wherein a tip portion of the snare wire is folded back toward the inside of the loop. At the tip of the snare wire, one elastic wire is bent back into a U shape to form the loop, and the portion bent back into the U shape is folded back toward the inside of the loop. The high-frequency snare for an endoscope according to claim 1. At the tip of the snare wire, two elastic wires are aligned and fixedly connected in parallel to form the loop, and the portion where the two elastic wires are aligned and fixedly connected is folded back toward the inside of the loop. The high-frequency snare for an endoscope according to claim 1. The high-frequency snare for an endoscope according to claim 1, 2 or 3, wherein a portion folded toward the inside of the loop is on the same plane as other portions of the snare wire. The high frequency snare for an endoscope according to claim 1, 2 or 3, wherein a portion folded toward the inside of the loop is on a plane deviated from a plane including the other portion of the snare wire.

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