JP2012105793A - Treatment tool with one direction bending function for endoscope - Google Patents

Treatment tool with one direction bending function for endoscope Download PDF

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JP2012105793A
JP2012105793A JP2010256435A JP2010256435A JP2012105793A JP 2012105793 A JP2012105793 A JP 2012105793A JP 2010256435 A JP2010256435 A JP 2010256435A JP 2010256435 A JP2010256435 A JP 2010256435A JP 2012105793 A JP2012105793 A JP 2012105793A
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sheath
lumen
bending
cut
sub
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Hiroyuki Watanabe
裕之 綿奈部
Masayasu Sato
雅康 佐藤
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Hoya Corp
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Hoya Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a treatment tool with one direction bending function for endoscope, which is structured simple using a flexible tube (multilumen tube) as a sheath while can be securely bent by remote operation to have excellent durability, and further has good linearity to be easily usable.SOLUTION: A sheath 1 is formed by a multilumen tube with a main lumen 4 and a sub-lumen 5. A bending operation wire 15 is inserted and disposed in the sub-lumen 5 forward/backward movably in the axial line direction. At least the sub-lumen 5 is formed on a position eccentric from the axial line of the sheath 1. A plurality of V-shape notches 31 formed to cut in the sheath 1 so as to almost vertically cut off the sub-lumen 5 and gapless notches 32 formed to cut in the sheath 1 from the direction opposite to the cut-in direction of the V-shape notches 31 are alternately formed shifting positions to the axial line direction of the sheath 1.

Description

この発明は、シースの先端付近に形成された湾曲部を手元側からの遠隔操作で一方向のみに屈曲させることができるように構成された一方向湾曲機能付内視鏡用処置具に関する。   The present invention relates to a treatment instrument for an endoscope with a one-way bending function configured so that a bending portion formed in the vicinity of the distal end of a sheath can be bent in only one direction by remote operation from the hand side.

内視鏡用処置具は内視鏡の処置具挿通チャンネルに通して使用されるものなので、処置具挿通チャンネルに通されるシースは極めて細くて長い可撓性のものであり、その直径は例えば２ｍｍ程度で長さは１〜２ｍ程度である。   Since the treatment instrument for endoscope is used through the treatment instrument insertion channel of the endoscope, the sheath that is passed through the treatment instrument insertion channel is extremely thin and long, and its diameter is, for example, The length is about 2 mm and the length is about 1 to 2 m.

そのような処置具の先端が内視鏡の先端から体内に突出した状態のときに、目標とする患部等を容易に狙撃することができるよう、シースの先端付近に形成された湾曲部を手元側からの遠隔操作で任意に屈曲させることができるようにしたものがある。   When the distal end of such a treatment tool protrudes into the body from the distal end of the endoscope, the curved portion formed in the vicinity of the distal end of the sheath is handed so that the target affected part can be easily sniped. There is one that can be bent arbitrarily by remote control from the side.

そのような湾曲部は、理屈の上では、内視鏡の湾曲部のように任意の方向に任意の角度だけ屈曲させることができる機構を採用したり、上下方向のどちらにでも屈曲させることができるようにしたりすることができそうである（例えば、特許文献１）。   In theory, such a bending portion may adopt a mechanism that can be bent at any angle in an arbitrary direction, such as a bending portion of an endoscope, or may be bent in either the vertical direction. It seems that it can be made possible (for example, patent document 1).

しかし現実には、内視鏡用処置具はシースの径が前述のように僅か２ｍｍ程度しかなく、しかも処置具としての本来の機能を発揮するのに必要なルーメンがシースに確保されている必要があるので、湾曲部の構造は一方向（即ち、真っ直ぐな状態から特定の一方向）のみに屈曲させることができる極めて単純なものにならざるを得ない。   However, in reality, the diameter of the sheath of the treatment instrument for endoscope is only about 2 mm as described above, and the lumen necessary for performing the original function as the treatment instrument needs to be secured in the sheath. Therefore, the structure of the bending portion has to be extremely simple and can be bent only in one direction (that is, from a straight state to a specific one direction).

そこで、可撓性チューブからなるシースに、湾曲部として外縁側から径方向にＶ形の切り込みを形成し、主ルーメン内に挿通された操作ワイヤを牽引操作することにより、シースが切り込み部分で屈曲するようにしていた（例えば、特許文献２）。   Therefore, a V-shaped cut is formed in the sheath made of a flexible tube in the radial direction from the outer edge side as a curved portion, and the sheath is bent at the cut portion by pulling the operation wire inserted into the main lumen. (For example, patent document 2).

特開平８−８９４７５JP-A-8-89475 特開２００２−２４８１７３JP 2002-248173 A

湾曲部の構造が極めて単純なものにならざるを得ない内視鏡用処置具においては、上述のように、シースを形成するチューブに外縁側から径方向に形成したＶ形の切り込みで湾曲部を形成し、その切り込み部分でシースが屈曲するようにするのが屈曲性の点等から優れている。   In an endoscopic treatment tool in which the structure of the bending portion has to be very simple, as described above, the bending portion is formed by a V-shaped notch formed radially from the outer edge side to the tube forming the sheath. It is excellent from the viewpoint of flexibility and the like that the sheath is bent at the cut portion.

しかし、そのような構成では、切り込みで切除されずに残されたシースの僅かな壁部分を支点にシースが屈曲するので、可撓性チューブからなるシースがその部分で短期間に劣化して屈曲動作が不安定になったり、破断したりする場合がある。   However, in such a configuration, the sheath bends with a slight wall portion of the sheath left without being cut off as a fulcrum, so that the sheath made of the flexible tube deteriorates and bends in that portion in a short time. Operation may become unstable or break.

そこで、Ｖ形の切り込みの深さを浅くすれば、切り込みで切除されずに残される壁部分が増大して強度的には向上するが、屈曲動作に対するチューブの抵抗が大きくて湾曲部を十分に屈曲させることができない。   Therefore, if the depth of the V-shaped cut is made shallower, the wall portion left uncut by the cut will increase and the strength will be improved, but the resistance of the tube to the bending action will be large, and the curved portion will be sufficiently It cannot be bent.

本発明は、シースとして可撓性チューブ（マルチルーメンチューブ）を用いた単純な構成でありながら、遠隔操作により確実に屈曲させることができて優れた耐久性を備え、しかも非屈曲時に直線性がよくて使い易い一方向湾曲機能付内視鏡用処置具を提供することを目的とする。   Although the present invention has a simple configuration using a flexible tube (multi-lumen tube) as a sheath, it can be reliably bent by remote operation, has excellent durability, and has linearity when not bent. An object of the present invention is to provide a good and easy-to-use endoscope treatment tool with a unidirectional bending function.

上記の目的を達成するため、本発明の一方向湾曲機能付内視鏡用処置具は、可撓性のある合成樹脂製のチューブからなるシースの最先端に先端処置部が設けられて、シース内に挿通配置された湾曲操作ワイヤを基端側から牽引操作することによりシースの先端付近に形成された湾曲部を一方向のみに屈曲させることができるように構成された一方向湾曲機能付内視鏡用処置具であって、シースが、主ルーメンと副ルーメンとを備えたマルチルーメンチューブにより形成されて、湾曲操作ワイヤが副ルーメンに軸線方向に進退自在に挿通配置され、少なくとも副ルーメンはシースの軸線位置から偏心した位置に形成されて、副ルーメンを略垂直に切断するようにシースに切り込み形成された複数のＶ形切り込みと、そのＶ形切り込みの切り込み方向とは反対方向からシースに切り込み形成された無隙切り込みとが、シースの軸線方向に位置をずらして交互に形成され、Ｖ形切り込みはシースの外縁側に向かって漸次広がる形状に形成されて、Ｖ形切り込みと無隙切り込みとが共にシースの外周面からシースの軸線位置に達しない深さに切り込み形成され、湾曲操作ワイヤが基端側から牽引操作されると、それに対応してＶ形切り込みが閉じ方向に変形すると同時に無隙切り込みが開き方向に変形して、シースが湾曲部において一方向のみに屈曲するものである。   In order to achieve the above object, a treatment tool for an endoscope with a unidirectional bending function according to the present invention is provided with a distal treatment section at the forefront of a sheath made of a flexible synthetic resin tube, With a one-way bending function configured so that the bending portion formed in the vicinity of the distal end of the sheath can be bent in only one direction by pulling the bending operation wire inserted through the base end from the proximal end side. A treatment instrument for an endoscope, wherein a sheath is formed of a multi-lumen tube having a main lumen and a sub-lumen, and a bending operation wire is inserted and arranged in the sub-lumen so as to be capable of moving forward and backward in an axial direction. A plurality of V-shaped cuts formed in the sheath so as to cut the sub-lumen substantially perpendicularly and formed at a position eccentric from the axial position of the sheath, and the cuts of the V-shaped cuts The gapless cuts formed in the sheath from the direction opposite to the direction are alternately formed by shifting the position in the axial direction of the sheath, and the V-shaped cut is formed in a shape gradually expanding toward the outer edge side of the sheath. Both the V-shaped notch and the gap-shaped notch are cut from the outer peripheral surface of the sheath to a depth that does not reach the axial position of the sheath, and when the bending operation wire is pulled from the proximal end side, the V-shaped notch At the same time the notch is deformed in the closing direction, the gapless notch is deformed in the opening direction, and the sheath is bent in only one direction at the curved portion.

なお、先端処置部を遠隔作動させるための先端処置部操作ワイヤが主ルーメンに挿通配置されていてもよい。   Note that a distal treatment section operation wire for remotely operating the distal treatment section may be disposed through the main lumen.

本発明によれば、副ルーメンを略垂直に切断するようにシースに切り込み形成された複数のＶ形切り込みと、そのＶ形切り込みの切り込み方向とは反対方向からシースに切り込み形成された無隙切り込みとが、シースの軸線方向に位置をずらして交互に形成されていることにより、シースとして可撓性チューブ（マルチルーメンチューブ）を用いた単純な構成でありながら、遠隔操作により確実に屈曲させることができて優れた耐久性を備え、しかも非屈曲時に直線性がよくて使い易い等の効果を奏する。   According to the present invention, a plurality of V-shaped cuts formed in the sheath so as to cut the sub-lumen substantially vertically, and a gapless cut formed in the sheath from the direction opposite to the cut direction of the V-shaped cut. Are alternately formed by shifting the position in the axial direction of the sheath, so that it is a simple configuration using a flexible tube (multi-lumen tube) as the sheath, but can be bent securely by remote operation. And has excellent durability, and also has an effect such as good linearity when not bent and easy to use.

本発明の実施例に係る一方向湾曲機能付内視鏡用処置具の湾曲部の側面断面図である。It is side surface sectional drawing of the curved part of the treatment tool for endoscopes with a one-way bending function which concerns on the Example of this invention. 本発明の実施例に係る一方向湾曲機能付内視鏡用処置具の図１におけるII−II断面図である。It is II-II sectional drawing in FIG. 1 of the treatment tool for endoscopes with a one-way bending function which concerns on the Example of this invention. 本発明の実施例に係る一方向湾曲機能付内視鏡用処置具の図１におけるIII−III断面図である。FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 of the endoscope treatment tool with a one-way bending function according to the embodiment of the present invention. 本発明の実施例に係る一方向湾曲機能付内視鏡用処置具の湾曲部が屈曲した状態の側面断面図である。It is side surface sectional drawing of the state in which the bending part of the treatment tool for endoscopes with a one-way bending function which concerns on the Example of this invention was bent. 本発明の実施例に係る内視鏡用処置具の全体構成図である。1 is an overall configuration diagram of an endoscope treatment tool according to an embodiment of the present invention.

以下、図面を参照して本発明の実施例を説明する。
図５は、内視鏡用処置具の全体構成を示している。１は、図示されていない内視鏡の処置具挿通チャンネルに挿通される可撓性のシースであり、例えばフッ素樹脂等のような滑りのよい合成樹脂材製のマルチルーメンチューブで形成されている。シース１の直径（外径）は例えば２ｍｍ程度、全長は例えば１〜２ｍ程度である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 5 shows the overall configuration of the endoscope treatment tool. Reference numeral 1 denotes a flexible sheath that is inserted into a treatment instrument insertion channel of an endoscope (not shown), and is formed of, for example, a multi-lumen tube made of a synthetic resin material such as a fluororesin that has a good sliding property. . The diameter (outer diameter) of the sheath 1 is, for example, about 2 mm, and the total length is, for example, about 1-2 m.

シース１の最先端には、内視鏡用処置具の先端処置部２が配置されている。この実施例の先端処置部２は生検組織を採取するための一対の鉗子カップであり、嘴状に開閉させることができる。ただし本発明は、先端処置部２が鉗子カップ以外の内視鏡用処置具であっても適用することができる。   At the most distal end of the sheath 1, a distal treatment section 2 of an endoscope treatment tool is disposed. The distal treatment section 2 of this embodiment is a pair of forceps cups for collecting biopsy tissue, and can be opened and closed like a bowl. However, the present invention can be applied even if the distal treatment section 2 is an endoscopic treatment tool other than a forceps cup.

シース１の基端には、オペレータが手で操作するための操作部１０が連結されている。シース１の基端が連結固定された細長い操作部本体１１には、先端処置部２である鉗子カップを遠隔的に開閉操作するためのカップ開閉用スライダ１２が、操作部本体１１の長手方向に沿ってスライド自在に取り付けられている。   An operation unit 10 is connected to the proximal end of the sheath 1 for an operator to operate by hand. A cup opening / closing slider 12 for remotely opening / closing a forceps cup as the distal treatment portion 2 is provided in the longitudinal direction of the operation portion main body 11 on the elongated operation portion main body 11 to which the proximal end of the sheath 1 is connected and fixed. It is slidably mounted along.

カップ開閉用スライダ１２には、先端処置部２である鉗子カップを開閉させるためにシース１内に進退自在に全長にわたって挿通配置された先端処置部操作ワイヤ１３の基端が連結固定されており、カップ開閉用スライダ１２を矢印Ｐで示されるように進退操作すると、それによって先端処置部操作ワイヤ１３が進退して先端処置部２が嘴状に開閉する。   The proximal end of the distal treatment portion operation wire 13 that is inserted through the entire length of the sheath 1 so as to be able to advance and retreat in order to open and close the forceps cup as the distal treatment portion 2 is connected and fixed to the cup opening / closing slider 12. When the cup opening / closing slider 12 is advanced or retracted as indicated by the arrow P, the distal treatment portion operation wire 13 is advanced or retracted thereby opening and closing the distal treatment portion 2 in a bowl shape.

１４は、図示されていない高周波電源コードを接続するための接続端子であり、先端処置部操作ワイヤ１３を経由して先端処置部２に高周波電流を通電し、いわゆるホットバイオプシーを行うことができる。   Reference numeral 14 denotes a connection terminal for connecting a high-frequency power cord (not shown), and a so-called hot biopsy can be performed by supplying a high-frequency current to the distal treatment section 2 via the distal treatment section operation wire 13.

操作部本体１１には、湾曲操作用スライダ１６が、カップ開閉用スライダ１２とは独立してカップ開閉用スライダ１２と直列の位置関係に、操作部本体１１の長手方向に沿ってスライド自在に取り付けられている。湾曲操作用スライダ１６には、シース１内に進退自在に全長にわたって挿通配置された湾曲操作ワイヤ１５の基端が連結固定されている。   A bending operation slider 16 is attached to the operation unit body 11 in a positional relationship in series with the cup opening / closing slider 12 independently of the cup opening / closing slider 12 so as to be slidable along the longitudinal direction of the operation unit body 11. It has been. The bending operation slider 15 has a proximal end of a bending operation wire 15 inserted and disposed in the sheath 1 so as to be able to advance and retreat in the entire length thereof.

その結果、湾曲操作用スライダ１６を矢印Ｑで示されるように進退操作することにより、シース１の先端近傍に形成された湾曲部３を、所定の一方向（即ち、真っ直ぐな状態から特定の一方向）に屈曲させることができる。   As a result, when the bending operation slider 16 is moved forward and backward as indicated by the arrow Q, the bending portion 3 formed in the vicinity of the distal end of the sheath 1 is moved to a specific direction from a predetermined direction (that is, from a straight state). Direction).

図１は湾曲部３付近を拡大して示している。マルチルーメンチューブであるシース１には、II−II断面とIII−III断面を図示する図２と図３にも示されるように、一つの主ルーメン４と一つの副ルーメン５とが全長にわたって軸線方向に貫通形成されている。少なくとも副ルーメン５は、シース１の軸線位置から偏心した位置に形成されている。   FIG. 1 shows the vicinity of the curved portion 3 in an enlarged manner. In the sheath 1 which is a multi-lumen tube, as shown in FIGS. 2 and 3 illustrating the II-II cross section and the III-III cross section, one main lumen 4 and one sub lumen 5 have an axial line over the entire length. It is formed penetrating in the direction. At least the auxiliary lumen 5 is formed at a position eccentric from the axial position of the sheath 1.

主ルーメン４内には、シース１の基端側に連結された操作部１０からの操作により先端処置部２を作動させるための導電性の柔軟な撚り線からなる先端処置部操作ワイヤ１３が、全長にわたって緩く挿通配置されている。先端処置部操作ワイヤ１３は各図において二点鎖線で略示されている。   In the main lumen 4, a distal treatment section operation wire 13 made of a conductive flexible stranded wire for operating the distal treatment section 2 by an operation from the operation section 10 connected to the proximal end side of the sheath 1 is provided. It is placed loosely over the entire length. The distal treatment section operation wire 13 is schematically indicated by a two-dot chain line in each drawing.

副ルーメン５には、操作部１０側から押し引き操作される湾曲操作ワイヤ１５が軸線方向に進退自在に挿通配置されている。湾曲操作ワイヤ１５の先端（図示せず）は、湾曲部３より先端寄りの位置においてシース１に対し直接固定され、或いは固定金具等を介して間接的にシース１に固定されている。   A bending operation wire 15 that is pushed and pulled from the operation unit 10 side is inserted into the auxiliary lumen 5 so as to be movable forward and backward in the axial direction. The distal end (not shown) of the bending operation wire 15 is directly fixed to the sheath 1 at a position closer to the distal end than the bending portion 3, or is indirectly fixed to the sheath 1 via a fixing fitting or the like.

湾曲部３においては、副ルーメン５を略垂直に切断するようにシース１にＶ形切り込み３１が切り込み形成されている。Ｖ形切り込み３１はシース１の長手方向に間隔をあけて複数形成されており、各Ｖ形切り込み３１が、シース１の外縁側に向かって漸次広がる形状に形成されている。   In the bending portion 3, a V-shaped cut 31 is formed in the sheath 1 so as to cut the auxiliary lumen 5 substantially vertically. A plurality of V-shaped cuts 31 are formed at intervals in the longitudinal direction of the sheath 1, and each V-shaped cut 31 is formed in a shape that gradually widens toward the outer edge side of the sheath 1.

また、Ｖ形切り込み３１の切り込み方向とは反対方向からシース１に無隙切り込み３２が切り込み形成されている。シース１の軸線方向に対して垂直をなす各無隙切り込み３２は、切り込み部においてシース１の壁部材を切除することなく、例えばカミソリ状の刃物でシース１に隙間が生じない状態に切り込み形成されている。   Further, a gapless cut 32 is formed in the sheath 1 from the opposite direction to the cut direction of the V-shaped cut 31. Each non-cutting notch 32 that is perpendicular to the axial direction of the sheath 1 is formed by cutting the sheath 1 without cutting the wall member of the sheath 1 at the notch, for example, with a razor blade so that no gap is generated in the sheath 1. ing.

そのような複数の無隙切り込み３２は、複数のＶ形切り込み３１と交互に、Ｖ形切り込み３１に対しシース１の軸線方向に位置をずらして形成されている。この実施例では、シース１の軸線方向において、隣り合うＶ形切り込み３１のちょうど中間位置に無隙切り込み３２が形成されている。   The plurality of gapless cuts 32 are formed alternately with the plurality of V-shaped cuts 31 so as to be displaced in the axial direction of the sheath 1 with respect to the V-shaped cuts 31. In this embodiment, a gapless cut 32 is formed at an exactly middle position between adjacent V-shaped cuts 31 in the axial direction of the sheath 1.

そのようなＶ形切り込み３１と無隙切り込み３２は共に、シース１の外周面からシース１の軸線位置に達しない深さに切り込み形成されている。図２には無隙切り込み３２の底部が破線で図示され、図３にはＶ形切り込み３１の底部が破線で図示されている。その結果、湾曲部３におけるシース１の強度が、著しく低下することなく確保されている。   Both the V-shaped notch 31 and the gapless notch 32 are formed so as to have a depth that does not reach the axial position of the sheath 1 from the outer peripheral surface of the sheath 1. In FIG. 2, the bottom of the gap-shaped cut 32 is illustrated by a broken line, and in FIG. 3, the bottom of the V-shaped cut 31 is illustrated by a broken line. As a result, the strength of the sheath 1 in the bending portion 3 is ensured without significantly decreasing.

なお、先端処置部操作ワイヤ１３の先端は、先端処置部２を開閉駆動するための公知のリンク機構（図示せず）に連結され、湾曲操作ワイヤ１５の先端は前述のように湾曲部３より先端寄りの位置においてシース１に対し固定されている。   The distal end of the distal treatment portion operation wire 13 is connected to a known link mechanism (not shown) for opening and closing the distal treatment portion 2, and the distal end of the bending manipulation wire 15 is connected to the bending portion 3 as described above. It is fixed to the sheath 1 at a position near the tip.

上述のように構成された実施例の一方向湾曲機能付内視鏡用処置具は、湾曲操作ワイヤ１５が操作部１０側から牽引操作されると、図４に示されるように、Ｖ形切り込み３１が閉じ方向に変形すると同時に無隙切り込み３２が開き方向に変形して、シース１が湾曲部３において一方向（湾曲操作ワイヤ１５が配置されている方向）のみに、湾曲操作ワイヤ１５の牽引量に対応する角度だけ屈曲する。   In the endoscope treatment instrument with a one-way bending function configured as described above, when the bending operation wire 15 is pulled from the operation unit 10 side, as shown in FIG. At the same time as 31 is deformed in the closing direction, the gapless notch 32 is deformed in the opening direction, and the sheath 1 is pulled in only one direction (the direction in which the bending operation wire 15 is disposed) in the bending portion 3. Bends at an angle corresponding to the amount.

この時、屈曲カーブの内周側の位置にＶ形切り込み３１が形成されているだけでなく、外周側の位置に無隙切り込み３２が形成されていることにより、湾曲部３が、大きな抵抗が発生することなく、湾曲操作ワイヤ１５の牽引操作に対応してスムーズに屈曲する。   At this time, not only the V-shaped cut 31 is formed at the position on the inner peripheral side of the bending curve, but the gap notch 32 is formed at the position on the outer peripheral side. Without being generated, it bends smoothly in response to the pulling operation of the bending operation wire 15.

そして、湾曲操作ワイヤ１５が操作部１０側から押し込み操作されると、図１に示されるように湾曲部３が真っ直ぐの状態に戻るが、無隙切り込み３２が隙間なく閉じた状態になることにより優れた直線性が得られるので、湾曲部３が振らつかず非常に使い易い。   When the bending operation wire 15 is pushed from the operation unit 10 side, the bending unit 3 returns to a straight state as shown in FIG. 1, but the gapless notch 32 is closed without a gap. Since excellent linearity is obtained, the bending portion 3 does not shake and is very easy to use.

このように、本発明の一方向湾曲機能付内視鏡用処置具は、シース１として可撓性チューブ（マルチルーメンチューブ）を用いた単純な構成でありながら、遠隔操作により確実に屈曲させることができて優れた耐久性を備え、しかも非屈曲時に直線性がよくて振らつかないので使い易い等の優れた特性を有する。   As described above, the endoscopic treatment instrument with a one-way bending function according to the present invention has a simple configuration using a flexible tube (multi-lumen tube) as the sheath 1 and can be reliably bent by remote operation. It has excellent durability such as being easy to use because it has excellent durability and has good linearity when not bent and does not shake.

１ シース
２ 先端処置部
３ 湾曲部
４ 主ルーメン
５ 副ルーメン
１０ 操作部
１５ 湾曲操作ワイヤ
３１ Ｖ形切り込み
３２ 無隙切り込み DESCRIPTION OF SYMBOLS 1 Sheath 2 Tip treatment part 3 Bending part 4 Main lumen 5 Sub lumen 10 Operation part 15 Bending operation wire 31 V-shaped cutting 32 No gap cutting

Claims (2)

可撓性のある合成樹脂製のチューブからなるシースの最先端に先端処置部が設けられて、上記シース内に挿通配置された湾曲操作ワイヤを基端側から牽引操作することにより上記シースの先端付近に形成された湾曲部を一方向のみに屈曲させることができるように構成された一方向湾曲機能付内視鏡用処置具であって、
上記シースが、主ルーメンと副ルーメンとを備えたマルチルーメンチューブにより形成されて、上記湾曲操作ワイヤが上記副ルーメンに軸線方向に進退自在に挿通配置され、
少なくとも上記副ルーメンは上記シースの軸線位置から偏心した位置に形成されて、上記副ルーメンを略垂直に切断するように上記シースに切り込み形成された複数のＶ形切り込みと、そのＶ形切り込みの切り込み方向とは反対方向から上記シースに切り込み形成された無隙切り込みとが、上記シースの軸線方向に位置をずらして交互に形成され、
上記Ｖ形切り込みは上記シースの外縁側に向かって漸次広がる形状に形成されて、上記Ｖ形切り込みと上記無隙切り込みとが共に上記シースの外周面から上記シースの軸線位置に達しない深さに切り込み形成され、
上記湾曲操作ワイヤが基端側から牽引操作されると、それに対応して上記Ｖ形切り込みが閉じ方向に変形すると同時に上記無隙切り込みが開き方向に変形して、上記シースが上記湾曲部において一方向のみに屈曲することを特徴とする一方向湾曲機能付内視鏡用処置具。 A distal end treatment portion is provided at the foremost end of the sheath made of a flexible synthetic resin tube, and the distal end of the sheath is pulled by operating a bending operation wire inserted into the sheath from the proximal end side. A treatment tool for an endoscope with a one-way bending function configured to bend a bending portion formed in the vicinity only in one direction,
The sheath is formed of a multi-lumen tube having a main lumen and a sub-lumen, and the bending operation wire is inserted and arranged in the sub-lumen so as to freely advance and retreat in the axial direction.
At least the sub-lumen is formed at a position eccentric from the axial position of the sheath, and a plurality of V-shaped incisions formed in the sheath so as to cut the sub-lumen substantially vertically, and a cut of the V-shaped notch Gapless cuts formed in the sheath from the opposite direction to the direction are formed alternately by shifting the position in the axial direction of the sheath,
The V-shaped cut is formed in a shape that gradually expands toward the outer edge side of the sheath, and the V-shaped cut and the gap-shaped cut are both deep enough not to reach the axial position of the sheath from the outer peripheral surface of the sheath. Notched and formed
When the bending operation wire is pulled from the proximal end side, the V-shaped notch is deformed in the closing direction and the gapless notch is deformed in the opening direction. An endoscopic treatment tool with a one-way bending function, characterized by bending only in a direction. 上記先端処置部を遠隔作動させるための先端処置部操作ワイヤが上記主ルーメンに挿通配置されている請求項１記載の一方向湾曲機能付内視鏡用処置具。   The treatment instrument for an endoscope with a one-way bending function according to claim 1, wherein a distal treatment section operation wire for remotely operating the distal treatment section is disposed through the main lumen.
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