JP2013230299A - Snare for endoscope - Google Patents

Snare for endoscope Download PDF

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JP2013230299A
JP2013230299A JP2012104806A JP2012104806A JP2013230299A JP 2013230299 A JP2013230299 A JP 2013230299A JP 2012104806 A JP2012104806 A JP 2012104806A JP 2012104806 A JP2012104806 A JP 2012104806A JP 2013230299 A JP2013230299 A JP 2013230299A
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snare
wire
endoscope
flexible tube
snare wire
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JP5951345B2 (en
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Noriyuki Sugita
憲幸 杉田
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Hoya Corp
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Hoya Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a snare for an endoscope which can reliably and easily fix a snare wire to a lesion part.SOLUTION: A snare for an endoscope is provided with: a flexible tube; an operation wire inserted in the flexible tube; a loop-shaped snare wire jointed to the distal end of the operation wire; and an operation part for protruding and retreating the snare wire from the distal end of the flexible tube by moving the operation wire back and forth in the flexible tube in the axial direction. The snare wire is provided with at least one pawl member which extends in a direction orthogonal to a flat surface surrounded by the loop of the snare wire.

Description

本発明は、病変部を切除するために使用される内視鏡用スネアに関する。   The present invention relates to an endoscopic snare used for excising a lesion.

内視鏡下外科手術において病変部を切除するため、内視鏡用スネアが使用される。この種の内視鏡用スネアの具体的構成が例えば特許文献１に記載されている。   An endoscopic snare is used to remove the lesion in endoscopic surgery. A specific configuration of this type of endoscope snare is described in Patent Document 1, for example.

特許文献１に記載の内視鏡用スネアには、複数の爪部材がループ（スネアワイヤ）の内側に向けられた状態でスネアワイヤに取り付けられている。術者によりループが病変部を囲うように載置されてスネアワイヤの引き込み操作が行われると、引き込み時に爪部材が病変部に食い込み、例えば***の小さい病変部であっても絞扼される。病変部が絞扼されている状態でスネアワイヤに高周波電流が流されると、病変部が切除される。   In the endoscope snare described in Patent Document 1, a plurality of claw members are attached to a snare wire in a state of being directed to the inside of a loop (snare wire). When the operator places the loop so as to surround the lesioned part and the snare wire is pulled in, the nail member bites into the lesioned part at the time of retracting, for example, even in a lesioned part with a small bulge. When a high-frequency current is passed through the snare wire while the lesion is being strangled, the lesion is removed.

特開２００１−２５８８９９号公報JP 2001-258899 A

特許文献１に記載の構成では、ループが病変部を囲うようにスネアワイヤを載置した上で引き込むことにより、はじめて、スネアワイヤが病変部に対して固定される。そのため、例えばスネアワイヤを病変部付近に載置してから引き込むまでの間にスネアワイヤが病変部から外れる虞がある。このような事情に鑑み、スネアワイヤを病変部に対して確実かつ簡易に固定することができる内視鏡用スネアの提供が望まれている。   In the configuration described in Patent Document 1, the snare wire is fixed to the lesioned part only after the snare wire is placed so that the loop surrounds the lesioned part and then retracted. Therefore, for example, there is a possibility that the snare wire is detached from the lesioned part after the snare wire is placed near the lesioned part and pulled. In view of such circumstances, it is desired to provide a snare for an endoscope that can reliably and easily fix a snare wire to a lesioned part.

本発明の一形態に係る内視鏡用スネアは、可撓管と、可撓管内に挿通された操作ワイヤと、操作ワイヤの先端に連結されたループ状のスネアワイヤと、操作ワイヤを可撓管内で軸線方向に進退させることにより、スネアワイヤを可撓管の先端から突没させる操作部とを備えており、スネアワイヤに、該スネアワイヤのループで囲われる平面に対して直交する方向に延びる少なくとも一つの爪部材が設けられていることを特徴とする。   An endoscope snare according to an aspect of the present invention includes a flexible tube, an operation wire inserted into the flexible tube, a loop-shaped snare wire connected to the distal end of the operation wire, and the operation wire. And an operation portion for projecting and retracting the snare wire from the tip of the flexible tube by advancing and retreating in the axial direction, and at least one of the snare wire extending in a direction perpendicular to the plane surrounded by the loop of the snare wire A claw member is provided.

本発明の一形態に係る内視鏡用スネアによれば、スネアワイヤを病変部付近に載置するだけで爪部材が病変部付近に引っ掛かり、スネアワイヤが病変部に対して固定される。すなわち、病変部に対するスネアワイヤの固定が確実かつ簡易に達成される。   According to the snare for an endoscope according to an embodiment of the present invention, the nail member is caught near the lesioned part only by placing the snare wire near the lesioned part, and the snare wire is fixed to the lesioned part. That is, the fixation of the snare wire to the lesioned part can be achieved reliably and easily.

爪部材の一つは、例えば可撓管の軸線の延長線上に配置されていてもよい。   One of the claw members may be disposed, for example, on an extension line of the axis of the flexible tube.

また、本発明の一形態に係る内視鏡用スネアは、可撓管の先端面に少なくとも一つの爪状突片を有する構成としてもよい。   Moreover, the snare for an endoscope according to an embodiment of the present invention may have a configuration having at least one claw-like projecting piece on the distal end surface of the flexible tube.

また、本発明の一形態に係る内視鏡用スネアは、可撓管及びスネアワイヤが摺動可能に挿通されており、可撓管に対して軸線方向に進退することにより、可撓管及びスネアワイヤを管内に収容し又は管先端から突出させる収容管を備える構成としてもよい。   In addition, the snare for an endoscope according to an aspect of the present invention has the flexible tube and the snare wire slidably inserted therein, and moves forward and backward in the axial direction with respect to the flexible tube, so that the flexible tube and the snare wire are inserted. It is good also as a structure provided with the accommodation pipe | tube which accommodates this in a pipe | tube or protrudes from the pipe | tube front-end | tip.

爪部材は、例えば、スネアワイヤの一部をループで囲われる平面に対して直交する方向に折り曲げた形状であってもよく、又は、スネアワイヤに取り付けられた部材であってもよい。   For example, the claw member may have a shape in which a part of the snare wire is bent in a direction orthogonal to a plane surrounded by the loop, or may be a member attached to the snare wire.

スネアワイヤは、可撓管に対して軸線周りに回転可能に構成されてもよい。   The snare wire may be configured to be rotatable about an axis with respect to the flexible tube.

本発明の一形態によれば、スネアワイヤを病変部に対して確実かつ簡易に固定することができる内視鏡用スネアが提供される。   According to an aspect of the present invention, an endoscopic snare capable of reliably and easily fixing a snare wire to a lesioned portion is provided.

本発明の実施形態の内視鏡用スネアの構成を示す図である。It is a figure which shows the structure of the snare for endoscopes of embodiment of this invention. 本発明の実施形態の内視鏡用スネアの先端付近の構成を示す図である。It is a figure which shows the structure of the tip vicinity of the snare for endoscopes of embodiment of this invention. 本発明の実施形態の内視鏡用スネアを用いた病変部の切除方法を説明する図である。It is a figure explaining the excision method of the lesioned part using the snare for endoscopes of the embodiment of the present invention. 本発明の実施形態の内視鏡用スネアが備える可撓性シースの先端面の形状を示す図である。It is a figure which shows the shape of the front end surface of the flexible sheath with which the snare for endoscopes of embodiment of this invention is provided. 別の実施形態の内視鏡用スネアの構成を示す図である。It is a figure which shows the structure of the snare for endoscopes of another embodiment. 別の実施形態の内視鏡用スネアの構成を示す図である。It is a figure which shows the structure of the snare for endoscopes of another embodiment.

以下、図面を参照して、本発明の実施形態による内視鏡用スネアについて説明する。   An endoscope snare according to an embodiment of the present invention will be described below with reference to the drawings.

図１は、本実施形態の内視鏡用スネア１の構成を示す図である。図１（ａ）は、内視鏡用スネア１の外観側面図であり、図１（ｂ）は、内視鏡用スネア１の側断面図である。図１に示されるように、内視鏡用スネア１は、手元操作部本体１０を備えている。手元操作部本体１０は、スライド操作部材１１を矢印Ａ方向にスライド可能に支持している。手元操作部本体１０には、回転保持環１２が軸線周り（矢印Ｂ方向）に回転可能に支持されている。回転保持環１２には、可撓性シース１３の基端が連結固着している。可撓性シース１３は、例えば四フッ化エチレン樹脂チューブなど、滑りのよい電気絶縁性の可撓性チューブである。可撓性シース１３の基端部分は、折れ止めチューブ１４によって補強されている。   FIG. 1 is a diagram illustrating a configuration of an endoscope snare 1 according to the present embodiment. FIG. 1A is an external side view of the endoscope snare 1, and FIG. 1B is a side sectional view of the endoscope snare 1. As shown in FIG. 1, the endoscope snare 1 includes a hand operation unit main body 10. The hand operation unit body 10 supports the slide operation member 11 so as to be slidable in the arrow A direction. A rotation holding ring 12 is supported on the hand operation unit body 10 so as to be rotatable around the axis (in the direction of arrow B). The base end of the flexible sheath 13 is connected and fixed to the rotation holding ring 12. The flexible sheath 13 is an electrically insulating flexible tube with good sliding property such as a tetrafluoroethylene resin tube. The proximal end portion of the flexible sheath 13 is reinforced by a bend preventing tube 14.

可撓性シース１３内には、導電性を有し、かつ軸線方向に進退可能な操作ワイヤ１５が全長に亘って挿通されている。操作ワイヤ１５の基端部分は、補強パイプ１６によって被膜されており、手元操作部本体１０に形成された軸線位置上のスリット１０ａ内に通されている。操作ワイヤ１５の基端は、スライド操作部材１１に固定されている。スライド操作部材１１には、高周波電源コード接続端子１７が付設されている。高周波電源コード接続端子１７は、一端が図示省略された高周波電源装置に接続され、他端が操作ワイヤ１５の基端に接続されている。   In the flexible sheath 13, an operation wire 15 having conductivity and capable of moving back and forth in the axial direction is inserted over the entire length. The proximal end portion of the operation wire 15 is coated with a reinforcing pipe 16 and is passed through a slit 10 a on the axial position formed in the hand operation unit main body 10. The proximal end of the operation wire 15 is fixed to the slide operation member 11. A high frequency power cord connection terminal 17 is attached to the slide operation member 11. One end of the high frequency power cord connecting terminal 17 is connected to a high frequency power supply device (not shown), and the other end is connected to the proximal end of the operation wire 15.

図２（ａ）は、図１（ａ）の符号Ｃで囲われる領域内の構成を拡大して示す図であり、図２（ｂ）は、当該構成を図２（ａ）内の矢印Ｄ方向より見たときの図である。また、図２（ｃ）は、図１（ｂ）の符号Ｅで囲われる領域内の構成を拡大して示す図である。   FIG. 2A is an enlarged view showing the configuration in the region surrounded by the symbol C in FIG. 1A, and FIG. 2B shows the configuration in the direction of the arrow D in FIG. It is a figure when it sees from a direction. FIG. 2C is an enlarged view showing the configuration in the region surrounded by the symbol E in FIG.

図２（ｃ）に示されるように、操作ワイヤ１５の先端には、連結パイプ１８を介してスネアワイヤ１９が連結固着している。スネアワイヤ１９は、導通性を有する一対のワイヤ（例えばステンレス鋼線）の基端同士を連結パイプ１８内で接続すると共に先端同士をロー付けで固定したものであり、自然状態でループ状に広がる。スライド操作部材１１が手元操作部本体１０に対して矢印Ａ方向にスライド操作されると、操作ワイヤ１５及びスネアワイヤ１９が軸線方向に進退する。スネアワイヤ１９は、例えば、軸線方向に後退して可撓性シース１３内に引き込まれると、可撓性シース１３内で弾性変形して細長く押しつぶされ、軸線方向に前進して可撓性シース１３の先端から突き出されると、自然状態（ループ状）に広がる。   As shown in FIG. 2C, a snare wire 19 is connected and fixed to the distal end of the operation wire 15 via a connecting pipe 18. The snare wire 19 is formed by connecting the proximal ends of a pair of conductive wires (for example, stainless steel wires) within the connecting pipe 18 and fixing the distal ends by brazing, and spreads in a loop shape in a natural state. When the slide operation member 11 is slid in the arrow A direction with respect to the hand operation unit main body 10, the operation wire 15 and the snare wire 19 advance and retreat in the axial direction. For example, when the snare wire 19 is retracted in the axial direction and pulled into the flexible sheath 13, the snare wire 19 is elastically deformed in the flexible sheath 13 and is squeezed into an elongated shape, and is advanced in the axial direction to move the flexible sheath 13. When protruding from the tip, it expands in a natural state (loop shape).

操作ワイヤ１５の先端は、連結パイプ１８内で（又は連結パイプ１８を介して）スネアワイヤ１９と電気的に接続している。高周波電源装置が駆動すると、高周波電源コード接続端子１７、操作ワイヤ１５、（連結パイプ１８）、スネアワイヤ１９に高周波電流が通電される。   The distal end of the operation wire 15 is electrically connected to the snare wire 19 within the connection pipe 18 (or via the connection pipe 18). When the high-frequency power supply device is driven, a high-frequency current is passed through the high-frequency power cord connection terminal 17, the operation wire 15 (the connecting pipe 18), and the snare wire 19.

スネアワイヤ１９の先端のロー付け部分には、爪部材２０もロー付けされている。爪部材２０は、図２（ａ）及び図２（ｂ）に示されるように、可撓性シース１３の軸線の延長線上に配置されており、スネアワイヤ１９のループで囲われる平面Ｓ（別の表現では、ループを含む平面Ｓ）に対して直交する方向に延びた形状を持つ。   The claw member 20 is also brazed to the brazed portion at the tip of the snare wire 19. 2 (a) and 2 (b), the claw member 20 is disposed on an extension line of the axis of the flexible sheath 13, and is formed on a plane S (another portion of the snare wire 19). In terms of expression, it has a shape extending in a direction orthogonal to the plane S) including the loop.

術者が回転保持環１２を指先等で保持して手元操作部本体１０を軸線周り（矢印Ｂ方向）に回転させると、操作ワイヤ１５が可撓性シース１３内で回転すると共にスネアワイヤ１９も操作ワイヤ１５と一体となって回転する。すなわち、術者は、手元操作部本体１０を回転操作することにより、スネアワイヤ１９のループの向き及び爪部材２０の向きを例えば病変部等の切除対象部位の位置に応じて適宜コントロールすることができる。操作ワイヤ１５は、例えば回転追従性に優れたトルクワイヤで構成されるのが好ましい。   When the surgeon holds the rotation holding ring 12 with a fingertip or the like and rotates the hand operation unit body 10 around the axis (in the direction of arrow B), the operation wire 15 rotates in the flexible sheath 13 and the snare wire 19 is also operated. It rotates together with the wire 15. That is, the operator can appropriately control the direction of the loop of the snare wire 19 and the direction of the nail member 20 according to the position of the excision target site such as a lesioned part by rotating the hand operating unit body 10. . The operation wire 15 is preferably composed of a torque wire having excellent rotational followability, for example.

また、可撓性シース１３及びスネアワイヤ１９は、収容シース２１内に摺動可能に挿通されている。収容シース２１の基端には、スライダ部材２２が取り付けられている。スライダ部材２２が軸線方向に前進操作されると収容シース２１も軸線方向に前進し、これにより、可撓性シース１３、スネアワイヤ１９及び爪部材２０が収容シース２１内に収容される。スライダ部材２２が軸線方向に後退操作されると収容シース２１も軸線方向に後退し、これにより、可撓性シース１３、スネアワイヤ１９及び爪部材２０が収容シース２１の先端から外部に露出する。   The flexible sheath 13 and the snare wire 19 are slidably inserted into the housing sheath 21. A slider member 22 is attached to the proximal end of the housing sheath 21. When the slider member 22 is advanced in the axial direction, the housing sheath 21 is also advanced in the axial direction, whereby the flexible sheath 13, the snare wire 19, and the claw member 20 are housed in the housing sheath 21. When the slider member 22 is retracted in the axial direction, the housing sheath 21 is also retracted in the axial direction, whereby the flexible sheath 13, the snare wire 19, and the claw member 20 are exposed to the outside from the distal end of the housing sheath 21.

図３（ａ）〜図３（ｄ）は、内視鏡用スネア１を用いた病変部の切除方法を説明する図である。図３においては、便宜上、内視鏡用スネア１の先端部分のみを図示する。   FIG. 3A to FIG. 3D are diagrams for explaining a method of excising a lesion using the snare 1 for endoscope. In FIG. 3, only the distal end portion of the endoscope snare 1 is shown for convenience.

内視鏡用スネア１は、例えば内視鏡の処置具チャネル（不図示）に挿通されて、病変部付近に導かれる。このとき、先端が鋭利な爪部材２０が外部に露出していると、処置具チャネル内を損傷させる虞がある。そこで、処置具チャネルへの内視鏡用スネア１の挿通に先立ち、スライダ部材２２が軸線方向に前進操作されて、図３（ｄ）に示されるように、可撓性シース１３、スネアワイヤ１９及び爪部材２０が収容シース２１内に収容される。この状態で内視鏡用スネア１が処置具チャネルに挿通されることにより、爪部材２０による処置具チャネルの損傷が避けられる。   The endoscopic snare 1 is inserted into, for example, a treatment instrument channel (not shown) of the endoscope and guided to the vicinity of the lesioned part. At this time, if the claw member 20 having a sharp tip is exposed to the outside, the inside of the treatment instrument channel may be damaged. Therefore, prior to insertion of the endoscope snare 1 into the treatment instrument channel, the slider member 22 is advanced in the axial direction, and as shown in FIG. 3 (d), the flexible sheath 13, the snare wire 19, and The claw member 20 is accommodated in the accommodating sheath 21. In this state, the endoscope snare 1 is inserted into the treatment instrument channel, so that the treatment instrument channel is not damaged by the claw member 20.

内視鏡用スネア１が処置具チャネルに挿通されると、次いで、スライダ部材２２が軸線方向に後退操作されて、可撓性シース１３、スネアワイヤ１９及び爪部材２０が収容シース２１の先端から外部に露出されると共に、スライド操作部材１１が軸線方向に前進操作されて、スネアワイヤ１９が可撓性シース１３の先端から突き出されてループ状に広がる。この状態でループが病変部を囲うようにスネアワイヤ１９が載置されると、例えば図３（ａ）に示されるように、スネアワイヤ１９のループで囲われる平面Ｓに対して直交する方向に延びた爪部材２０が病変部の（内視鏡用スネア１から見て）奥側に引っ掛かり、スネアワイヤ１９が病変部に対して固定される。すなわち、本実施形態では、スネアワイヤ１９を病変部付近に載置した段階でスネアワイヤ１９が病変部に対して固定される。   When the endoscope snare 1 is inserted into the treatment instrument channel, the slider member 22 is then retracted in the axial direction, so that the flexible sheath 13, the snare wire 19, and the claw member 20 are externally exposed from the distal end of the housing sheath 21. The slide operation member 11 is moved forward in the axial direction, and the snare wire 19 is protruded from the distal end of the flexible sheath 13 and spreads in a loop shape. In this state, when the snare wire 19 is placed so that the loop surrounds the lesion, for example, as shown in FIG. 3A, the snare wire 19 extends in a direction orthogonal to the plane S surrounded by the loop of the snare wire 19. The claw member 20 is hooked on the back side of the lesioned part (as viewed from the endoscope snare 1), and the snare wire 19 is fixed to the lesioned part. That is, in this embodiment, the snare wire 19 is fixed to the lesioned part at the stage where the snare wire 19 is placed near the lesioned part.

ここで、図４（ａ）、図４（ｂ）の各図において、可撓性シース１３の先端面の形状を例示する。これらの図面に例示されるように、可撓性シース１３の先端面には、先端が鋭利な、少なくとも一つの爪状突片２３が形成されている。具体的には、図４（ａ）の例では、一対の爪状突片２３の各々が一対のＶ溝間に形成されており、図４（ｂ）の例では、二対の爪状突片２３の各々が各Ｖ溝間に形成されている。なお、爪状突片２３は、可撓性シース１３に一体に形成されたものであっても、別体（絶縁部材）で形成されたものであってもよい。   Here, in each figure of Fig.4 (a) and FIG.4 (b), the shape of the front end surface of the flexible sheath 13 is illustrated. As illustrated in these drawings, at least one claw-like projecting piece 23 having a sharp tip is formed on the tip surface of the flexible sheath 13. Specifically, in the example of FIG. 4 (a), each of the pair of claw-shaped protrusions 23 is formed between a pair of V-grooves, and in the example of FIG. 4 (b), two pairs of claw-shaped protrusions. Each of the pieces 23 is formed between the V grooves. The claw-like projecting piece 23 may be formed integrally with the flexible sheath 13 or may be formed as a separate body (insulating member).

爪部材２０が病変部の奥側に引っ掛けられた状態で可撓性シース１３が病変部に押し当てられると、可撓性シース１３の先端面に設けられた各爪状突片２３が病変部の（内視鏡用スネア１から見て）手前側に食い込み、スネアワイヤ１９が病変部に対してより確実に固定される。次いで、スネアワイヤ１９が可撓性シース１３内に引き込まれながら通電されると、図３（ｂ）、図３（ｃ）に示されるように、病変部がスネアワイヤ１９により絞扼されて切除される。   When the flexible sheath 13 is pressed against the lesioned part while the nail member 20 is hooked on the back side of the lesioned part, each nail-like projecting piece 23 provided on the distal end surface of the flexible sheath 13 becomes the lesioned part. This bites into the near side (as viewed from the endoscope snare 1), and the snare wire 19 is more securely fixed to the lesioned part. Next, when the snare wire 19 is energized while being drawn into the flexible sheath 13, the lesioned part is squeezed by the snare wire 19 and excised as shown in FIGS. 3 (b) and 3 (c). .

本実施形態では、爪部材２０が可撓性シース１３の軸線の延長線上に配置されており、かつ各爪状突片２３が可撓性シース１３の軸線近傍位置に配置されている。そのため、スネアワイヤ１９が軸線方向に引き込まれると、病変部は、爪部材２０と爪状突片２３とによって摘まれた状態で絞扼される。そのため、スネアワイヤ１９と病変部との固定は強固であり、例えば、スネアワイヤ１９が軸線方向に引き込まれている間に意図しない外力が加わったとしても、スネアワイヤ１９が病変部から簡単には外れない。   In the present embodiment, the claw member 20 is disposed on an extension line of the axis of the flexible sheath 13, and each claw-shaped projecting piece 23 is disposed in the vicinity of the axis of the flexible sheath 13. Therefore, when the snare wire 19 is pulled in the axial direction, the lesioned part is squeezed in a state where it is picked up by the nail member 20 and the nail-like projecting piece 23. For this reason, the snare wire 19 and the lesioned part are firmly fixed. For example, even if an unintended external force is applied while the snare wire 19 is pulled in the axial direction, the snare wire 19 is not easily detached from the lesioned part.

病変部の切除後は、図３（ｄ）に示されるように、可撓性シース１３、スネアワイヤ１９及び爪部材２０が収容シース２１内に収容される。この状態で内視鏡用スネア１が処置具チャネルから抜去されることにより、爪部材２０による処置具チャネルの損傷が避けられる。   After excision of the lesioned part, the flexible sheath 13, the snare wire 19 and the claw member 20 are accommodated in the accommodating sheath 21, as shown in FIG. In this state, the endoscope snare 1 is removed from the treatment instrument channel, so that the treatment instrument channel is not damaged by the claw member 20.

以上が本発明の例示的な実施形態の説明である。本発明の実施形態は、上記に説明したものに限定されず、本発明の技術的思想の範囲において様々な変形が可能である。例えば明細書中に例示的に明示される実施形態等又は自明な実施形態等を適宜組み合わせた内容も本願の実施形態に含まれる。   The above is the description of the exemplary embodiments of the present invention. Embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical idea of the present invention. For example, the embodiment of the present application also includes an embodiment that is exemplarily specified in the specification or a combination of obvious embodiments and the like as appropriate.

図５（ａ）及び図５（ｂ）は、別の実施形態の内視鏡用スネア１ｚの構成を示す図である。別の実施形態の内視鏡用スネア１ｚは、爪部材の構成を除き、図１の内視鏡用スネア１と同一の構成を有している。図５（ａ）及び図５（ｂ）に示されるように、別の実施形態のスネアワイヤ１９ｚは、導通性を有する一対のワイヤの基端同士を連結パイプ１８内で接続すると共に先端同士をレーザ溶接した上で、溶接された先端を、スネアワイヤ１９ｚのループで囲われる平面Ｓと直交する方向に折り曲げて爪部材２０ｚとしている。別の実施形態では、スネアワイヤ１９と爪部材２０ｚとが一体化されており、部品点数の削減に有利な構成となっている。   Fig.5 (a) and FIG.5 (b) are figures which show the structure of the snare 1z for endoscopes of another embodiment. The endoscopic snare 1z of another embodiment has the same configuration as the endoscopic snare 1 of FIG. 1 except for the configuration of the claw member. As shown in FIG. 5A and FIG. 5B, the snare wire 19z of another embodiment connects the proximal ends of a pair of conductive wires within the connecting pipe 18 and lasers the distal ends thereof. After welding, the welded tip is bent in a direction perpendicular to the plane S surrounded by the loop of the snare wire 19z to form a claw member 20z. In another embodiment, the snare wire 19 and the claw member 20z are integrated, which is advantageous in reducing the number of parts.

図６（ａ）及び図６（ｂ）は、別の実施形態の内視鏡用スネア１ｙの構成を示す図である。別の実施形態の内視鏡用スネア１ｙは、図１の内視鏡用スネア１に対して一対の爪部材２０を追加した構成を有している。追加された各爪部材２０は、例えばスネアワイヤ１９先端の爪部材２０と連結パイプ１８との中間地点にロー付けされている。爪部材２０の数を増加させるほどスネアワイヤ１９を病変部に対してより一層強固に固定することができる。   FIGS. 6A and 6B are diagrams showing the configuration of an endoscope snare 1y according to another embodiment. An endoscopic snare 1y according to another embodiment has a configuration in which a pair of claw members 20 is added to the endoscopic snare 1 of FIG. Each added claw member 20 is brazed, for example, at an intermediate point between the claw member 20 at the tip of the snare wire 19 and the connecting pipe 18. As the number of the claw members 20 is increased, the snare wire 19 can be more firmly fixed to the lesioned part.

１ 内視鏡用スネア
１０ 操作部本体
１０ａ スリット
１１ スライド操作部材
１２ 回転保持環
１３ 可撓性シース
１４ 折れ止めチューブ
１５ 操作ワイヤ
１６ 補強パイプ
１７ 高周波電源コード接続端子
１８ 連結パイプ
１９ スネアワイヤ
２０ 爪部材
２１ 収容シース
２２ スライダ部材
２３ 爪状突片 DESCRIPTION OF SYMBOLS 1 Endoscope snare 10 Operation part main body 10a Slit 11 Slide operation member 12 Rotation holding ring 13 Flexible sheath 14 Folding tube 15 Operation wire 16 Reinforcement pipe 17 High frequency power supply cord connection terminal 18 Connection pipe 19 Snare wire 20 Claw member 21 Accommodating sheath 22 Slider member 23 Claw-shaped protrusion

Claims (6)

可撓管と、
前記可撓管内に挿通された操作ワイヤと、
前記操作ワイヤの先端に連結されたループ状のスネアワイヤと、
前記操作ワイヤを前記可撓管内で軸線方向に進退させることにより、前記スネアワイヤを前記可撓管の先端から突没させる操作部と、
を備え、
前記スネアワイヤに、該スネアワイヤのループで囲われる平面に対して直交する方向に延びる少なくとも一つの爪部材が設けられていることを特徴とする、内視鏡用スネア。 A flexible tube;
An operation wire inserted into the flexible tube;
A looped snare wire connected to the tip of the operation wire;
An operation portion for projecting and retracting the snare wire from the distal end of the flexible tube by moving the operation wire in the axial direction in the flexible tube;
With
The snare for an endoscope, wherein the snare wire is provided with at least one claw member extending in a direction orthogonal to a plane surrounded by the loop of the snare wire. 前記爪部材の一つは、前記可撓管の軸線の延長線上に配置されていることを特徴とする、請求項１に記載の内視鏡用スネア。   The endoscope snare according to claim 1, wherein one of the claw members is disposed on an extension line of an axis of the flexible tube. 前記可撓管の先端面に少なくとも一つの爪状突片を有することを特徴とする、請求項１又は請求項２に記載の内視鏡用スネア。   The snare for an endoscope according to claim 1 or 2, wherein at least one claw-like projecting piece is provided on a distal end surface of the flexible tube. 前記可撓管及び前記スネアワイヤが摺動可能に挿通されており、該可撓管に対して軸線方向に進退することにより、該可撓管及び該スネアワイヤを管内に収容し又は管先端から突出させる収容管
を備えることを特徴とする、請求項１から請求項３の何れか一項に記載の内視鏡用スネア。 The flexible tube and the snare wire are slidably inserted, and the flexible tube and the snare wire are accommodated in the tube or protruded from the tip of the tube by moving forward and backward in the axial direction with respect to the flexible tube. The endoscope snare according to any one of claims 1 to 3, further comprising a storage tube. 前記爪部材は、
前記スネアワイヤの一部を前記ループで囲われる平面に対して直交する方向に折り曲げた形状であること、又は
前記スネアワイヤに取り付けられた部材であること
を特徴とする、請求項１から請求項４の何れか一項に記載の内視鏡用スネア。 The claw member is
5. The device according to claim 1, wherein a part of the snare wire is bent in a direction perpendicular to a plane surrounded by the loop, or a member attached to the snare wire. The endoscope snare according to any one of the above. 前記スネアワイヤは、前記可撓管に対して前記軸線周りに回転可能であることを特徴とする、請求項１から請求項５の何れか一項に記載の内視鏡用スネア。   The snare for an endoscope according to any one of claims 1 to 5, wherein the snare wire is rotatable around the axis with respect to the flexible tube.
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