JP4294108B2

JP4294108B2 - Medical ligature

Info

Publication number: JP4294108B2
Application number: JP08661997A
Authority: JP
Inventors: 努中村
Original assignee: Olympus Corp
Current assignee: Olympus Corp
Priority date: 1997-04-04
Filing date: 1997-04-04
Publication date: 2009-07-08
Anticipated expiration: 2017-04-04
Also published as: JPH10277046A

Description

【０００１】
【発明の属する技術分野】
本発明は医療用結紮具、詳しくは可撓性の線材により病変組織部を結紮するループ部を形成した医療用結紮具に関する。
【０００２】
【従来の技術】
従来の医療用結紮具は可撓性の線材をループ状に曲げ、その両側端部を束ねて円筒状のストッパ内に圧入し、ストッパを先端側へ移動させることにより上記ループ部を縮径して病変組織を結紮するようにしたものである。この医療用結紮具を使用するに当たっては経内視鏡的、すなわち内視鏡の処置具挿通用チャンネルを通して体内に導入し、体内の病変組織部にループ部を掛けてそれを縮径させることにより病変組織部を緊縛させる。この結紮によって病変組織の血流が止まるため、この結紮状態で数日間、維持すると、数日後には病変組織が壊死し、病変組織部が脱落する。このとき、医療用結紮具も同時に脱落し、肛門から自然に排出されるというものである。
【０００３】
【発明が解決しようとする課題】
（従来技術の問題点）
従来の医療用結紮具にあっては結紮用ループ部を形成する可撓性線材に真円の断面形状を有するものを使用しているため、結紮用ループ部によって強めに病変組織部を緊縛すると、組織の１箇所に力が集中して強く、くい込み、その組織を切断する虞がある。従って、実際の使用時において十分に強い力で結紮する力加減が難しく、高度の熟練が術者に要求されていた。結紮用ループ部を形成する可撓性線材に特別の部品を追加して緊縛量を規制するとした場合には、部品点数が増し、かつ構成が複雑になるという新たな欠点を生む。
【０００４】
（目的）
本発明は上記問題点に着目してなされたもので、その目的とするところは特別の部品を追加することなしに、組織を切断することなく、結紮用ループ部で確実かつ適切な結紮処置を行うことが可能な医療用結紮具を提供することにある。
【０００５】
【課題を解決するための手段及び作用】
（手段）
請求項１に係る発明は、結紮用ループ部を形成する可撓性の線材と、この線材を圧入したストッパとを有し、上記ストッパを上記ループ部の先端側へ移動させることにより上記ループ部を締めて組織を結紮するようにした医療用結紮具において、上記結紮用ループ部により上記組織を結紮する際に上記組織に対する上記線材のくい込みの集中を避けて上記組織の切断を防止するために上記線材の横断面形状を、上記ループ部が作る平面に直交する縦方向に長い略扁平な形に形成するとともに、上記横断面形状での縦方向両端部を、上記線材の内面から外面にわたり丸めた形に形成したことを特徴とする医療用結紮具である。
請求項２に係る発明は、結紮用ループ部を形成する可撓性の線材と、この線材を圧入したストッパとを有し、上記ストッパを上記ループ部の先端側へ移動させることにより上記ループ部を締めて組織を結紮するようにした医療用結紮具において、上記結紮用ループ部により上記組織を結紮する際に上記組織に対する上記線材のくい込みの集中を避けて上記組織の切断を防止するために上記結紮用ループ部を形成する線材の横断面形状を、上記ループ部が作る平面に直交する縦方向に長い長円形に形成するとともに、上記横断面形状での縦方向両端部を、上記線材の内面から外面にわたり丸めた形としたことを特徴とする医療用結紮具である。
請求項３に係る発明は、結紮用ループ部を形成する可撓性の線材と、この線材を圧入したストッパとを有し、上記ストッパを上記ループ部の先端側へ移動させることにより上記ループ部を締めて組織を結紮するようにした医療用結紮具において、上記結紮用ループ部により上記組織を結紮する際に上記組織に対する上記線材のくい込みの集中を避けて上記組織の切断を防止するために上記結紮用ループ部を形成する線材の横断面形状を、上記ループ部が作る平面に直交する縦方向に長い楕円形に形成するとともに、上記横断面形状での縦方向両端部を、上記線材の内面から外面にわたり丸めた形としたことを特徴とする医療用結紮具である。
請求項４に係る発明は、結紮用ループ部を形成する可撓性の線材と、この線材を圧入したストッパとを有し、上記ストッパを上記ループ部の先端側へ移動させることにより上記ループ部を締めて組織を結紮するようにした医療用結紮具において、上記結紮用ループ部により上記組織を結紮する際に上記組織に対する上記線材のくい込みの集中を避けて上記組織の切断を防止するために上記結紮用ループ部を形成する線材の横断面形状を上記ループ部が作る平面に直交する縦方向に長く形成するとともに、上記横断面形状での縦方向両端部を上記線材の内面から外面にわたり丸め、上記横断面形状での中央部を狭く形成して略ひょうたん形に形成したことを特徴とする医療用結紮具である。
（作用）
結紮用ループ部を形成する線材の横断面形状を、上記ループ部が作る平面に直交する縦方向に長く形成した上でその線材の横断面形状の縦方向両端部を上記線材の内面から外面にわたり丸めた形に形成し、これにより、上記結紮用ループ部の線材が緊縛対象の組織に接触する面積が増し、緊縛時において強く力を掛けたときでも縦方向両端により組織が切断され難い。
【０００６】
【発明の実施の形態】
図１乃至図２を参照して本発明の第１の実施形態に係る医療用結紮装置を説明する。図１（ａ）はその医療用結紮装置の先端部付近部分の構成を示す説明図であり、図１（ｂ）は図１（ａ）中、Ｘ−Ｘ線に沿う線材部分の断面図であり、図２は医療用結紮具の結紮状態の説明図である。
【０００７】
医療用結紮装置１は体内に留置される結紮具２と、この結紮具２を体内に誘導して組織を結紮する操作を行う操作装置３とを備えて構成される。
上記操作装置３は挿入部１１と手元側操作部（図示せず）とを備えてなる。挿入部１１はシース１３と、このシース１３の内孔に進退可能に挿通された操作ワイヤ１４とからなり、操作ワイヤ１４の先端にはシース１３内に引き込み摺動自在の外径を有したフック１５が取着されている。フック１５には上記結紮具２に着脱自在に係止するための鈎状の掛け口１６が形成されている。フック１５の掛け口１６の開口部分はフック１５がシース１３内に引き込まれたときに、シース１３の内面で閉塞されるようになっている。
【０００８】
次に、上記結紮具２の構成を説明する。結紮具２は無端状に形成した可撓性線材（ワイヤ）２１と、この可撓性線材２１の中間両部分を束ねてこの束ねた部分に圧入して被嵌した円筒状のストッパ２２とを有してなり、可撓性線材２１の、ストッパ２２よりも先端側に位置するループ部分により結紮用ループ部２３を形成し、一方、可撓性線材２１の、ストッパ２２よりも基端側に位置するループ部分によりフック装着用ループ部２４を形成している。
【０００９】
上記可撓性線材２１は例えば合成樹脂や金属を材料とする素材のものであり、合成樹脂としては例えばナイロン、ポリオレフィンが用いられ、金属としては例えばステンレス鋼が用いられる。そして、可撓性線材２１は特に結紮用ループ部２３においてそのループ中心側に長辺部を持つ長方形の断面形状を有する（図１（ａ）を参照）。そして、このループ中心側に位置する長辺部が直線部であって、組織を結紮する際に接触する当接面２５となっている。つまり、上記結紮用ループ部２３を形成する可撓性線材の断面形状を、上記ループ部２３が作る平面に直交する縦方向に長い略偏平な形状に形成した。従って、上記ループ部２３が作る平面に平行な方向の厚みが薄く、結紮する組織に接触する当接面２５が大きくなる。
【００１０】
尚、結紮用ループ部２３とフック装着用ループ部２４の素材を別部材として、結紮用ループ部２４の線材の端部にフック装着用ループ部２４の素材を連結して構成してもよい。この場合、上記のような異形の断面形状とする部分は少なくとも結紮用ループ部２３のみであってもよい。
【００１１】
以下、上記医療用結紮装置１の作用を説明する。まず、シース１３の先端開口からフック１５を突き出した状態で、フック１５の掛け口１６に結紮具２のフック装着用ループ部２４を掛ける。この後、操作ワイヤ１４を引いて結紮具２のフック装着用ループ部２４をシース１３内に引き込む。すると、図１（ａ）で示すような、結紮具２の装着状態になる。
【００１２】
この状態で挿入部１１を経内視鏡的、すなわち内視鏡の処置具挿通用チャンネルを通して体内に導入し、体内の目的対象のポリープ状の病変組織部２６の根元に結紮用ループ部２３を掛けて、手元操作部１２の操作により操作ワイヤ１４を引き、フック１５を後退させる。すると、フック１５によって結紮具２がシース１３内に引き込まれるが、ストッパ２２はその後端がシース１３の先端に突き当たって阻止されるので、結紮具２の結紮用ループ部２３が縮径して、図２で示す如く病変組織部２６を緊縛する。この結紮によって病変組織部２６への血流が止まる。この後、フック１５を再度シース１３の先端開口から突き出すと、フック１５の掛け口１６からフック装着用ループ部２４が外れ、結紮具２のみが体内に留置される。以上の操作によって体内の病変組織部２６の緊縛が完了する。
【００１３】
この結紮状態で、数日間、結紮具２を体内に留置すると、数日後には病変組織部２６が壊死し、病変組織部２６が脱落する。このとき、結紮具２も同時に脱落し、例えば肛門から自然に排出される。
【００１４】
上記医療用結紮装置１での結紮具２における可撓性線材２１の、特に結紮用ループ部２３における素材がループ中心側に長辺部を持つ長方形の断面形状であるので、その病変組織部２６と接触する当接面２５の面積が大きい。そのため、フック１５を引く力が強い場合でも病変組織部２６を切断してしまうことなく、十分強く緊縛することが容易になった。
【００１５】
この点、従来の結紮具の線材２７の断面形状は図６で示す如く、真円の形状であるため、その結紮用ループ部によって強めに病変組織部２６を緊縛すると、組織の１箇所に力が集中し過ぎて大きくくい込み、その組織を切断する虞があり、実際の使用時において十分に強い力で結紮するときの力加減が難しく、高度の熟練が術者に求められてきたが、この実施形態によれば、この欠点が解消され、結紮用ループ部２３で確実かつ適切な結紮処置を行うことが可能となった。
【００１６】
尚、上記実施形態では特に結紮用ループ部２３においての可撓性線材２１の断面形状をループ中心側に長辺部を持つ長方形としたが、本発明はこの形状に限らない。例えば、図３で示すように長方形の両端部に丸み３１を付けた長円形のもの、図４で示すように楕円形のもの、図５で示すように、ひょうたん形等、ループの中心側に長辺を有する略偏平な断面形状であればよく、これらのものも上記実施形態と同様の効果が得られる。
【００１７】
［付記］
１．結紮用ループ部を形成する可撓性の線材と、この線材を圧入したストッパとを有し、上記ストッパを上記ループ部の先端側へ移動させることにより上記ループ部を締めて組織を結紮するようにした医療用結紮具において、
上記結紮用ループ部を形成する線材の断面形状を、上記ループ部が作る平面に直交する縦方向に長い略偏平な形状に形成したことを特徴とする医療用結紮具。
【００１８】
２．可撓性の線材からなる結紮用ループ部と、
上記結紮用ループ部の可撓性の線材を束ねた状態でこれに圧入した円筒状のストッパと、
上記ストッパよりも基端側に形成され、牽引用フックを着脱自在に装着できるフック装着部とを備え、
上記結紮用ループ部を形成する線材の断面形状を、上記ループ部が作る平面に直交する方向に長い形状に形成したことを特徴とする医療用結紮具。
３．付記項１，２に示す医療用結紮具において、上記結紮用ループ部を形成する線材の断面形状はその一部にループ部中心に向かう直線部を有することを特徴とする医療用結紮具。
４．付記項１，２に示す医療用結紮具において、上記結紮用ループ部を形成する線材の断面形状が長円であることを特徴とする医療用結紮具。
５．付記項１に示す医療用結紮具において、上記結紮用ループ部を形成する線材の断面形状が楕円であることを特徴とする医療用結紮具。
６．付記項１，２に示す医療用結紮具において、上記結紮用ループ部を形成する線材の断面形状がひょうたん型であることを特徴とする医療用結紮具。
【００１９】
【発明の効果】
以上説明したように、本発明による医療用結紮具は、結紮用ループ部を形成する線材の横断面形状を、上記ループ部が作る平面に直交する縦方向に長い略扁平な形であるとともにその縦方向両端部を丸めた形に形成したので、特別の部品を追加することなしに、結紮対象の病変組織部に接触する接触面の面積を増やせる。従って、緊縛する力が強い場合でも組織を切断してしまうことなく、十分強く緊縛することが容易になった。
【図面の簡単な説明】
【図１】（ａ）は第１の実施形態に係る医療用結紮装置の先端部付近部分の構成を示す説明図、（ｂ）は（ａ）中、Ｘ−Ｘ矢視線に沿っての線材部分の断面図。
【図２】上記医療用結紮装置の結紮具による組織の結紮状態の説明図。
【図３】他の結紮具による組織の結紮状態の説明図。
【図４】さらに他の結紮具による組織の結紮状態の説明図。
【図５】さらに別の結紮具による組織の結紮状態の説明図。
【図６】従来の結紮具による組織の結紮状態の説明図。
【符号の説明】
１…医療用結紮装置、２…結紮具、３…操作装置、１１…挿入部、
１３…シース、１４…操作ワイヤ、１５…フック、２１…可撓性線材、
２２…ストッパ、２３…結紮用ループ部、２４…フック装着用ループ部、
２５…当接面、２６…病変組織部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a medical ligation tool, and more particularly to a medical ligation tool in which a loop portion for ligating a diseased tissue portion is formed with a flexible wire.
[0002]
[Prior art]
A conventional medical ligature tool bends a flexible wire in a loop shape, bundles the ends of both ends together, presses them into a cylindrical stopper, and moves the stopper toward the distal end to reduce the diameter of the loop portion. In this way, the lesioned tissue is ligated. When using this medical ligation instrument, it is introduced into the body through the endoscope insertion channel, that is, through the treatment instrument insertion channel of the endoscope, and the diameter is reduced by applying a loop portion to the lesion tissue part in the body. Tighten the affected tissue. This ligation stops the blood flow of the diseased tissue. If this ligation state is maintained for several days, the diseased tissue becomes necrotic and the diseased tissue part falls off after several days. At this time, the medical ligation tool also falls off at the same time and is naturally discharged from the anus.
[0003]
[Problems to be solved by the invention]
(Problems of conventional technology)
In the conventional medical ligation tool, since the flexible wire forming the ligation loop portion has a perfect cross-sectional shape, the ligation loop portion strongly binds the lesion tissue portion. There is a risk that the force concentrates in one place of the tissue and is strongly and bite, and the tissue is cut. Therefore, it is difficult to adjust the force to ligate with a sufficiently strong force during actual use, and a high degree of skill is required of the operator. When a special part is added to the flexible wire forming the ligation loop portion to restrict the amount of binding, there is a new disadvantage that the number of parts increases and the configuration becomes complicated.
[0004]
(the purpose)
The present invention has been made paying attention to the above-mentioned problems, and the object is to add a ligation treatment surely and appropriately at the ligation loop without cutting the tissue without adding special parts. It is to provide a medical ligation tool that can be performed.
[0005]
[Means and Actions for Solving the Problems]
(means)
The invention according to claim 1 includes a flexible wire forming a loop portion for ligation and a stopper into which the wire is press-fitted, and the loop portion is moved by moving the stopper toward the distal end side of the loop portion. a medical ligature tool which is adapted to ligate the tissue by tightening the, by the ligation loop portion while avoiding the concentration of bite of the wire with respect to the tissue when ligating the tissue in order to prevent cutting of the tissue The cross-sectional shape of the wire rod is formed in a substantially flat shape that is long in the vertical direction perpendicular to the plane formed by the loop portion, and both longitudinal end portions in the cross-sectional shape are rounded from the inner surface to the outer surface of the wire rod. It is a medical ligature characterized by being formed into a round shape.
The invention according to claim 2 includes a flexible wire forming a ligation loop portion and a stopper into which the wire material is press-fitted, and the loop portion is moved by moving the stopper toward the tip side of the loop portion. In a medical ligation device that is configured to ligate the tissue by tightening the ligature, in order to prevent cutting of the tissue by avoiding the concentration of the wire rod biting into the tissue when the tissue is ligated by the ligation loop portion The cross-sectional shape of the wire forming the loop portion for ligation is formed into an oblong shape that is long in the vertical direction perpendicular to the plane formed by the loop portion, and both longitudinal ends of the cross-sectional shape are formed on the wire rod. A medical ligature characterized by being rounded from the inner surface to the outer surface.
The invention according to claim 3 includes a flexible wire forming the loop portion for ligation and a stopper into which the wire is press-fitted, and the loop portion is moved by moving the stopper toward the distal end side of the loop portion. In a medical ligation device that is configured to ligate the tissue by tightening the ligature, in order to prevent cutting of the tissue by avoiding the concentration of the wire rod biting into the tissue when the tissue is ligated by the ligation loop portion The cross-sectional shape of the wire material forming the loop portion for ligation is formed into an elliptical shape that is long in the vertical direction perpendicular to the plane formed by the loop portion, and both longitudinal end portions in the cross-sectional shape are formed on the wire material. A medical ligature characterized by being rounded from the inner surface to the outer surface.
The invention according to claim 4 has a flexible wire forming the loop portion for ligation and a stopper into which the wire is press-fitted, and the loop portion is moved by moving the stopper toward the tip side of the loop portion. In a medical ligation device that is configured to ligate the tissue by tightening the ligature, in order to prevent cutting of the tissue by avoiding the concentration of the wire rod biting into the tissue when the tissue is ligated by the ligation loop portion The cross-sectional shape of the wire forming the loop portion for ligation is formed long in the vertical direction perpendicular to the plane formed by the loop portion, and both longitudinal ends of the cross-sectional shape are rounded from the inner surface to the outer surface of the wire material. The medical ligation tool is characterized in that the central portion in the cross-sectional shape is narrowly formed to have a substantially gourd shape.
(Function)
The cross-sectional shape of the wire forming the ligation loop portion is formed long in the vertical direction perpendicular to the plane created by the loop portion, and the both longitudinal ends of the cross-sectional shape of the wire extend from the inner surface to the outer surface of the wire rod. It is formed in a rounded shape, whereby the area in which the wire of the ligation loop portion contacts the tissue to be bound is increased, and even when a strong force is applied at the time of binding, the tissue is not easily cut by the longitudinal ends .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A medical ligation apparatus according to a first embodiment of the present invention will be described with reference to FIGS. Fig.1 (a) is explanatory drawing which shows the structure of the front-end | tip part vicinity part of the medical ligation apparatus, FIG.1 (b) is sectional drawing of the wire part part in alignment with XX in FIG.1 (a). FIG. 2 is an explanatory diagram of the ligated state of the medical ligation tool.
[0007]
The medical ligation apparatus 1 includes a ligation instrument 2 that is placed in the body, and an operation apparatus 3 that performs an operation of guiding the ligation instrument 2 into the body and ligating tissue.
The operating device 3 includes an insertion unit 11 and a hand side operation unit (not shown). The insertion portion 11 includes a sheath 13 and an operation wire 14 that is inserted into the inner hole of the sheath 13 so as to be able to advance and retract. A hook having an outer diameter that can be drawn into the sheath 13 and slidable at the distal end of the operation wire 14. 15 is attached. A hook-like hook 16 is formed in the hook 15 so as to be detachably locked to the ligature tool 2. The opening portion of the hook 16 of the hook 15 is blocked by the inner surface of the sheath 13 when the hook 15 is drawn into the sheath 13.
[0008]
Next, the configuration of the ligation tool 2 will be described. The ligature tool 2 includes an endless flexible wire (wire) 21 and a cylindrical stopper 22 that is fitted into the bundled portion by bundling the intermediate portions of the flexible wire 21. The ligating loop portion 23 is formed by the loop portion of the flexible wire 21 that is located on the distal end side of the stopper 22, while the flexible wire 21 is on the proximal end side of the stopper 22. A hook mounting loop portion 24 is formed by the positioned loop portion.
[0009]
The flexible wire 21 is a material made of, for example, a synthetic resin or metal. For example, nylon or polyolefin is used as the synthetic resin, and stainless steel is used as the metal. The flexible wire 21 has a rectangular cross-sectional shape having a long side portion on the loop center side particularly in the ligation loop portion 23 (see FIG. 1A). And the long side part located in this loop center side is a linear part, Comprising: It becomes the contact surface 25 which contacts when a structure | tissue is ligated. That is, the cross-sectional shape of the flexible wire forming the ligation loop portion 23 is formed into a substantially flat shape that is long in the vertical direction perpendicular to the plane formed by the loop portion 23. Accordingly, the thickness in the direction parallel to the plane formed by the loop portion 23 is thin, and the contact surface 25 that comes into contact with the tissue to be ligated is increased.
[0010]
The material of the hook mounting loop portion 24 may be connected to the end portion of the wire rod of the ligating loop portion 24 using the materials of the ligating loop portion 23 and the hook mounting loop portion 24 as separate members. In this case, at least the ligation loop portion 23 may be the portion having the above-mentioned irregular cross-sectional shape.
[0011]
Hereinafter, the operation of the medical ligation apparatus 1 will be described. First, with the hook 15 protruding from the distal end opening of the sheath 13, the hook mounting loop portion 24 of the ligature tool 2 is hung on the hook 16 of the hook 15. Thereafter, the operation wire 14 is pulled to draw the hook mounting loop portion 24 of the ligature tool 2 into the sheath 13. Then, it will be in the mounting state of the ligation tool 2 as shown to Fig.1 (a).
[0012]
In this state, the insertion section 11 is introduced into the body through a channel for endoscopic treatment, that is, through a treatment instrument insertion channel of the endoscope, and a ligation loop section 23 is provided at the base of a polyp-like lesion tissue section 26 as a target object in the body. The operation wire 14 is pulled by operating the hand operation unit 12 and the hook 15 is retracted. Then, the ligature tool 2 is pulled into the sheath 13 by the hook 15, but the stopper 22 is blocked by the rear end of the stopper 13 abutting against the distal end of the sheath 13, so that the diameter of the ligation loop portion 23 of the ligature tool 2 is reduced, As shown in FIG. 2, the lesioned tissue part 26 is tightly bound. This ligation stops blood flow to the diseased tissue part 26. Thereafter, when the hook 15 is again protruded from the distal end opening of the sheath 13, the hook mounting loop portion 24 is detached from the hook 16 of the hook 15, and only the ligature tool 2 is left in the body. With the above operation, the binding of the lesioned tissue part 26 in the body is completed.
[0013]
In this ligated state, when the ligature tool 2 is left in the body for several days, the diseased tissue part 26 is necrotized after several days, and the diseased tissue part 26 falls off. At this time, the ligature tool 2 also falls off at the same time and is naturally discharged from the anus, for example.
[0014]
Since the material of the flexible wire 21 in the ligation tool 2 in the medical ligation apparatus 1, particularly the material in the ligation loop portion 23, has a rectangular cross-sectional shape having a long side on the loop center side, the lesion tissue portion 26 The area of the contact surface 25 that comes into contact with is large. Therefore, even when the force of pulling the hook 15 is strong, it becomes easy to bind the lesion tissue portion sufficiently strongly without cutting the lesion tissue portion 26.
[0015]
In this respect, since the cross-sectional shape of the wire rod 27 of the conventional ligation tool is a perfect circle shape as shown in FIG. 6, if the lesioned tissue portion 26 is tightly bound by the ligation loop portion, a force is applied to one place in the tissue. However, it is difficult to adjust the force when ligating with a sufficiently strong force in actual use, and high skill is required for the surgeon. According to the embodiment, this drawback is eliminated, and the ligation loop portion 23 can perform a reliable and appropriate ligation treatment.
[0016]
In the above-described embodiment, the cross-sectional shape of the flexible wire 21 in the ligation loop portion 23 is a rectangle having a long side portion on the loop center side, but the present invention is not limited to this shape. For example, as shown in FIG. 3, an oblong shape with rounded edges 31 at both ends of the rectangle, an oval shape as shown in FIG. 4, a gourd shape as shown in FIG. Any substantially flat cross-sectional shape having a long side may be used, and these can provide the same effects as those of the above embodiment.
[0017]
[Appendix]
1. It has a flexible wire forming the loop portion for ligation and a stopper press-fitted with the wire, and the stopper is moved toward the distal end side of the loop portion to tighten the loop portion and ligate the tissue. In the medical ligature tool
A medical ligation tool, wherein a cross-sectional shape of a wire forming the loop portion for ligation is formed into a substantially flat shape that is long in a vertical direction perpendicular to a plane formed by the loop portion.
[0018]
2. A ligation loop made of a flexible wire,
A cylindrical stopper press-fitted into the bundled flexible wire of the ligation loop,
A hook mounting portion that is formed on the base end side from the stopper and that can be detachably mounted with a tow hook,
A medical ligation tool characterized in that a cross-sectional shape of a wire material forming the loop portion for ligation is formed in a shape that is long in a direction perpendicular to a plane formed by the loop portion.
3. The medical ligation tool according to any one of additions 1 and 2, wherein the cross-sectional shape of the wire forming the loop portion for ligation has a linear portion toward the center of the loop portion in a part thereof.
4). The medical ligation tool shown in the additional items 1 and 2, characterized in that the cross-sectional shape of the wire forming the loop portion for ligation is an ellipse.
5. The medical ligation tool according to appendix 1, wherein the cross-sectional shape of the wire material forming the ligation loop portion is an ellipse.
6). The medical ligation tool as set forth in Additional Items 1 and 2, wherein the cross-sectional shape of the wire forming the loop portion for ligation is a gourd type.
[0019]
【The invention's effect】
As described above, along with its medical ligation tool according to the invention, the transverse cross-sectional shape of the wire forming the ligation loop section, a long substantially flat shape in the vertical direction perpendicular to the plane of the loop portion is made Since both ends in the longitudinal direction are formed in a rounded shape, the area of the contact surface in contact with the lesioned tissue portion to be ligated can be increased without adding special parts. Therefore, even when the binding force is strong, it becomes easy to bind sufficiently strongly without cutting the tissue.
[Brief description of the drawings]
FIG. 1A is an explanatory view showing the configuration of the vicinity of the distal end portion of the medical ligation apparatus according to the first embodiment, and FIG. 1B is a wire along the line XX in FIG. Sectional drawing of a part.
FIG. 2 is an explanatory diagram of a tissue ligation state by the ligation tool of the medical ligation apparatus.
FIG. 3 is an explanatory diagram of a tissue ligation state using another ligation tool.
FIG. 4 is an explanatory diagram of a tissue ligation state using still another ligation tool.
FIG. 5 is an explanatory diagram of a tissue ligation state using still another ligation tool.
FIG. 6 is an explanatory diagram of a tissue ligation state using a conventional ligation tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Medical ligation apparatus, 2 ... Ligature, 3 ... Operation apparatus, 11 ... Insertion part,
13 ... sheath, 14 ... operation wire, 15 ... hook, 21 ... flexible wire,
22 ... Stopper, 23 ... Loop part for ligation, 24 ... Loop part for hook attachment,
25 ... abutting surface, 26 ... lesioned tissue part.

Claims

It has a flexible wire forming the loop portion for ligation and a stopper press-fitted with the wire, and the stopper is moved toward the distal end side of the loop portion to tighten the loop portion and ligate the tissue. In the medical ligature tool
When the tissue is ligated by the ligation loop portion, the cross-sectional shape of the wire is orthogonal to the plane formed by the loop portion in order to prevent the biting of the wire to the tissue and prevent the tissue from being cut. A medical ligation tool characterized in that it is formed in a substantially flat shape that is long in the longitudinal direction, and both longitudinal ends of the cross-sectional shape are rounded from the inner surface to the outer surface of the wire .

It has a flexible wire forming the loop portion for ligation and a stopper press-fitted with the wire, and the stopper is moved toward the distal end side of the loop portion to tighten the loop portion and ligate the tissue. In the medical ligature tool
When the tissue is ligated by the ligation loop portion, the cross-sectional shape of the wire forming the ligation loop portion to prevent the tissue from being cut to avoid the concentration of biting of the wire into the tissue, It is formed in a long oval shape in the vertical direction perpendicular to the plane formed by the loop portion, and both ends in the vertical direction in the cross-sectional shape are rounded from the inner surface to the outer surface of the wire . Ligature.

It has a flexible wire forming the loop portion for ligation and a stopper press-fitted with the wire, and the stopper is moved toward the distal end side of the loop portion to tighten the loop portion and ligate the tissue. In the medical ligature tool
When the tissue is ligated by the ligation loop portion, the cross-sectional shape of the wire forming the ligation loop portion to prevent the tissue from being cut to avoid the concentration of biting of the wire into the tissue, It is formed in an elliptical shape that is long in the vertical direction perpendicular to the plane formed by the loop portion, and both longitudinal ends of the cross-sectional shape are rounded from the inner surface to the outer surface of the wire . Ligature.

It has a flexible wire forming the loop portion for ligation and a stopper press-fitted with the wire, and the stopper is moved toward the distal end side of the loop portion to tighten the loop portion and ligate the tissue. In the medical ligature tool
When the tissue is ligated by the ligation loop portion, the cross-sectional shape of the wire forming the ligation loop portion to prevent the tissue from being cut to avoid the concentration of biting of the wire into the tissue, while vertically rather long form perpendicular to the plane in which the loop section is made, the longitudinal end portions of the above cross-sectional shape, rounding over the outer surface from the inner surface of the wire, and the central portion of the above cross-sectional shape is narrower A medical ligature characterized by having a substantially gourd shape.