JP4084245B2

JP4084245B2 - Medical treatment instrument using an operation wire rope

Info

Publication number: JP4084245B2
Application number: JP2003178838A
Authority: JP
Inventors: 富久加藤; 弘幸西原
Original assignee: Asahi Intecc Co Ltd
Current assignee: Asahi Intecc Co Ltd
Priority date: 2003-06-24
Filing date: 2003-06-24
Publication date: 2008-04-30
Anticipated expiration: 2023-06-24
Also published as: JP2005013296A

Description

【０００１】
【発明の属する技術分野】
本発明は、特許文献１に示される内視鏡用処置具、特許文献２に示される多機能外科用器具、等の「操作用ワイヤロープを用いて成る医療用処置具」に関するものである。
【０００２】
【従来の技術】
特許文献１・２等に示される「操作用ワイヤロープを用いて成る医療用処置具」は、下撚りの下層と上撚りの外層の撚り方向を相互に逆方向にして撚合して単一のワイヤロープに成した「交差撚り構成の操作用ワイヤロープ」を導管内に挿通して手元操作部と先端処置部を連結した構造を有し、体腔内の病変部へ挿入セットした該先端処置部を体外に位置させた該手元操作部を「押し・引き・回転」操作して、該操作用ワイヤロープを操作力伝達要素として機能させ、該先端処置部を「押し・引き・回転・キヤッチ作動」させて応分の治療を施す構造・機能に成っている。
【０００３】
【特許文献１】
特開平８−１２６６４８号公報（要約、図１〜図３）
【特許文献２】
特開２００２−２８２２６１公報（要約、図１）
【０００４】
【発明が解決しようとする課題】
以上の特許文献１・２等に示される公知技術の「操作用ワイヤロープを用いて成る医療用処置具は、手元操作部から先端処置部への操作力伝達の機械的要素を構成する操作用ワイヤロープが、前記の「交差撚り構成」であることから、以下に述べる難点がある。
【０００５】
即ち、手元操作部を「押し・引き・回転操作」して先端処置部を「押し・引き・回転作動」させるとき、操作用ワイヤロープによる操作力・操作量（押し・引きストローク）の減殺量が大にして術者（当該処置具を操作する医師等）による該先端処置部の操作性が悪い。
【０００６】
そして、手元操作部を回転操作するときの先端処置部の回転追従性・応答性が悪く、その上回転操作による操作用ワイヤロープの「捻り溜り」が発生し易く、この「捻り溜り」が限界に達して一気解放されて先端処置部の急激過剰回転をもたらす現象を生じて病変部の治療性を妨げる。
【０００７】
本発明は、以上の従来技術の難点を解消し、さらなる高品質の「操作用ワイヤロープを用いて成る医療用処置具」を提供するものである。
【０００８】
【課題を解決するための手段】
以上の技術課題を解決する本発明は「手元操作部と先端処置部の間に、操作用ワイヤロープを用いて成る医療用処置具において、前記操作用ワイヤロープを、下撚りの下層と上撚りの外層を同一方向に撚合した平行撚り撚合形態とし、上撚りの外層は太径素線と細径素線の交互配列とし、前記太径素線は、隣接両側の前記細径素線と下層の２本の素線との４点の線接触で、かつ、前記細径素線は、隣接両側の前記太径素線と下層の１本の素線との３点の線接触である撚り構成とし、前記外層の外周に樹脂被覆を存在または不存在にした構造」が基本構成である。そして、前記基本構成からなる本発明の医療用器具は、特有作用効果のさらなる向上を図る技術意図から、下記段落に示す諸態様を採択する。なお、本発明の医療用処置具は「ワイヤロープを主材に成す医療用ガイドワイヤ」を含めたものを意味する。
【０００９】
即ち、「前記構成の操作用ワイヤロープの全体または一部を、中空撚線コイル体の導管に嵌挿する態様」「その導管の外周の少くとも一部に、切削加工または研磨を施したり、その導管内周に合成樹脂チューブを挿通する態様」或は「複数の体内留置器具を連装する態様」「スエージング加工またはダイス引き加工した操作用ワイヤロープを用いる態様」或は「前記中空撚線コイル体の導管を用いたものにおいて、操作用ワイヤロープの撚り方向と該中空撚線コイル体の巻き方向を相互に逆方向組合せにする態様等」を採択する。
【００１０】
【作用】
「本発明の前記構成の操作用ワイヤロープ（以下、ワイヤロープＷＡという）」と「交差撚り構成の従来の操作用ワイヤロープ（以下、ワイヤロープＷＢという）」の性能対比実験の結果は下記の表１〜表６に示すとおりである。
【００１１】
なお、下記各表は図５に示す取廻し状態の同一条件の基に対比実験したワイヤロープＷＡ・ＷＢの実測対比データーである。
【００１２】
【表１】

【００１３】
【表２】

【００１４】
【表３】

【００１５】
【表４】

【００１６】
【表５】

【００１７】
【表６】

【００１８】
なお、上記各表の対比実験におけるワイヤロープＷＡ・ＷＢは、それぞれ「下撚りの直径を概ね同一にして」ワイヤロープＷＢは「同一径の素線群を上撚りにして、かつ下撚りと上撚りを交差撚りした構成」、ワイヤロープＷＡは「上撚りを太線と細線の交互組合せにして、下撚りと平行撚りした構成」にして、表１に例示する取り廻し状態で対比実験した。そして、前記表の測定特性は下記の定義である。
操作効率＝Ｆを分母、Ｗを分子とする百分率
出力係数＝操作効率の逆数
操作力＝Ｆの引張り荷重
操作量＝先端側の変位量
回転追従性＝手元側の回転に対する先端側の応答回転性
【００１９】
前記の表１〜表６から下記のことが言える。即ち、機械的伝達力の機械要素としての操作効率と出力係数はワイヤロープＷＡがワイヤロープＷＢより高く「該図表から推定する摩擦係数は、ワイヤロープＷＢ＝０．０３１に対してワイヤロープＷＡ＝０．０２８」となり、ワイヤロープＷＡはワイヤロープＷＢより導管・体腔内での摺動性に優れる。
【００２０】
そして、操作反復時の「操作力・操作量の変動幅」のいずれも、ワイヤロープＷＡはワイヤロープＷＢの約１／３〜１／４となる。この特性は医療用処置具の先端処置部を同一に操作させるための手元操作部の操作力・操作量を特段に少くさせることが可能にして、ワイヤロープＷＡはワイヤロープＷＢより特段の高性能操作性が存在する。
【００２１】
さらに、回転追従性は「初回において、ワイヤロープＷＡは、手元側の９０°回転の２回転で回転し始めるのに対して、ワイヤロープＷＢは概ね手元側の９０°回転の６回転でようやく回転をし始めると共に手元側の９０°回転の１１回転近傍において「残留ねじり」を一気放散させるピークがあらわれる不良現象がある。そして、耐久１００回後はワイヤロープＷＡは繰り返し回転する「うねり」があらわれるものの、ワイヤロープＷＢはこの「うねり高さが極めて高い極端なピーク」が顕出し、手元操作部による先端処置部の操作性は「ワイヤロープＷＡがワイヤロープＷＢより特段に円滑にして安定する」ことを意味する。以上の主たる特有作用が存在する。
【００２２】
なお、ワイヤロープＷＡの前記の良好な機械的性質は下記のメカニズムによると推論される。即ち、従来構造のワイヤロープＷＢは、隣接素線相互が単純な２点〜３点接触形態（下撚りの下層と上撚りの外層の撚り方向が相互に逆方向となるので下撚りの下層の素線と上撚りの外層の素線の接触点は単なる点接触となる）となるので、捻回力・押し引き外力を受けたとき「素線の相互滑り・素線個個の浮き上り・素線間隙の開き」等の現象を生じて一方から他方へ伝達する機械的伝達力の伝達性能・伝達効率が悪い。
【００２３】
しかし、ワイヤロープＷＡは、下撚りの下層と上撚りの外層の撚り方向が平行にして、かつ、上撚りの外層は太径素線と細径素線の交互配設形態であることから、上撚りの外層の太径素線は内側の下撚りの下層の２本の素線と隣接する両側の細径素線との４点接触、上撚りの外層の細径素線は内側の下撚りの下層の１本の素線と隣接両側の太径素線との３点接触にして、その３点・４点の接触がワイヤロープの長手方向に連続する線接触形態（下撚りの下層と上撚りの外層の撚り方向が平行であることから）となる。従って、ワイヤロープＷＡの機械的伝達力は、ワイヤロープＷＢの前記不良現象が抑止・防止されて極めて高効率・高性能の伝達が可能になる。
【００２４】
【発明の実施の形態】
まず、本発明のワイヤロープＷＡの基本形態を図１を参照して説明する。即ち、ワイヤロープＷＡは、複数の素線を撚合した下撚りの下層（図示のものは１×７の素線撚合）の外周に、上撚りの外層を設けたワイヤロープにおいて、下撚りの下層２と上撚りの外層３は同一方向に撚合構成された平行撚りにして、上撚りの外層３は太径素線５と細径素線６を交互配列して隣接素線の外周を相互接触させた撚合構造に構成されている。
【００２５】
そして、太径素線５は「下撚りの下層２の２本の素線外周と、両側の細径素線６の外周」と４点接触形態を成し、細径素線６は「下撚りの下層２の１本の素線外周と、両側の太径素線５の外周」と３点接触形態に構成され、下記例示の医療用処置具の操作用動力伝達の機械要素として機能するように成っている。この図１実施形態のワイヤロープＷＡは表１〜表６に示す各種特性を奏する機械要素ワイヤロープとして機能する。
【００２６】
続いて、図２・図３を参照してワイヤロープＷＡを用いて成る医療用処置具の実施形態を説明する。即ち、まず図２（Ａ）（Ｂ）は手元操作部８と体腔内に挿入して応分の治療を行う先端処置部９との間の操作用動力伝達のワイヤロープとして、ワイヤロープＷＡを用いた公知の内視鏡用処置具の医療用処置具１０が示してある。
【００２７】
詳しくは図２（Ａ）（Ｂ）の内視鏡用処置具の医療用処置具１０は、手元操作部８を、押し、引き、又は回転操作して先端処置部９の留置ループ１１を拡縮させたり、生検カップ１２を開閉させる操作用ワイヤロープとして本発明のワイヤロープＷＡが用いてあり、このワイヤロープＷＡは「手元操作部８と先端処置部９に介装連結した可撓性の中空撚線コイル体１３」の中空部に貫挿されている。
【００２８】
以上の図２実施形態のものはワイヤロープＷＡを操作力伝達用ロープとしているので、前記の特有作用がある。即ち、血管・体腔内へ挿入進行させるときの先端処置部９の挿入進行が軽やかにしてステックスリップがなく極めて円滑となると共に、先端処置部９が治療部位へ到達した後の手元操作部８による先端処置部９の各種機械的操作の操作性が、従来のワイヤロープＷＢを用いるものより特段にし易くなって迅速かつ的確な当該治療が行える。
【００２９】
なお、この図２実施形態のものは、前記の特有作用のさらなる向上を図る技術意図で（図２（Ｄ）（Ｅ）参照）中空撚線コイル体１３の中空部内周に樹脂製（ふっ素樹脂・ポリエチレン・ナイロン等）のインナーチューブ１４をインサートしたり、ワイヤロープＷＡの外周に同じく樹脂被覆１５を施す態様を必要に応じて採択する。この態様のものは、金属と金属の接触構造ではなく、金属と樹脂の接触構造となるので、中空撚線コイル体１３に対するワイヤロープＷＡの摺動性が一段と向上して、前記特有作用が一段と向上する。
【００３０】
さらに、ワイヤロープＷＡと中空撚線コイル体１３の中空部内周にインナーチューブ１４をインサートした構成においては、ワイヤロープＷＡの外周に樹脂被覆１５を施した態様に比較して、ワイヤロープＷＡと中空撚線コイル体１３の内周凸部形状との接触面圧を低下させることにより、樹脂の摩耗による「金属と金属の接触によるスティックスリップの発生を抑え」操作フィーリングを一段と向上させ、一定の操作力をより長期安定維持することができる。
【００３１】
そして、中空撚線コイル体１３に「複数素線を密着巻きした複巻き形態」を用いる場合は、単線密着巻き形態のコイル体のものが、屈曲時に「曲率半径が大なる外側にコイル線の離間が生ずる」のに対して、各素線が相対すべり移動して離間しないので、操作用ワイヤロープＷＡがコイル体内へ引っ張られることがない。従って、内視鏡用処置具を体内へ挿入するとき、屈曲状態の影響を受けて先端処置部９の留置ループ１１の拡縮変形を生ずることがなく、手元操作部８を操作する術者の意図に的確に順応する良好な操作が可能になる。
【００３２】
続いて図３を参照して本発明の他の実施形態の医療用処置具１０を説明する。即ち、この図３に示すものは手元操作部８のスライダー１７を押し・引き・回転操作して先端処置部９のクリップ１６を作動させる公知の内視鏡処置具であり、図２のものと同様に「手元操作部８と先端処置部９間を中空撚線コイル体１３で連結すると共に、そのコイル体１３に操作力伝達用のワイヤロープＷＡが貫挿されている。なお、図３（Ａ）はクリップ１６の単装形態、図３（Ｂ）はクリップ１６の３連装形態が示してある。
【００３３】
この図３実施形態の医療用処置具１０も図２実施形態のものと同様な作用効果が享受できる。そして、前記連装形態のものは下記の特有作用がある。即ち、ワイヤロープＷＡの平行撚り構造による「伸び量小」のロープと、屈曲時各素線相対すべり移動が発生してコイル線間が離間しない構造にして、ワイヤロープ操作時に反力による圧縮力を受けても縮み量の少ない「中空撚線コイル体１３」とを併用することにより、より一層操作量が少くてすむ。即ち、少い操作量でクリップを外すことが可能になり、逆に同一操作量であれば、その分連装クリップの装着個数を増大させる特段の作用効果があり、術者の一回の体内操作でより多くの傷口治療ができる。
【００３４】
なお、以上の図２・図３実施形態の医療用処置具１０は、体腔内への挿入性の一段の向上を図る技術意図で、図３（Ｃ）例示のように中空撚線コイル体１３の外周を機械的に研削加工して平滑外周やテーパー管形態にして剛直・柔軟の徐変形態にすることがあり、さらに図示しないが図１に示すワイヤロープＷＡの外周を研磨加工・ドローイング加工によって平滑外周及び「ドローイングによって中心部へ圧縮することによりロープ伸び量が少くなる」態様にしたり、中空撚線コイル体１３不存在のワイヤロープＷＡの露出形態、或は、ワイヤロープＷＡの撚り方向と中空撚線コイル体１３の巻き方向を相互に逆方向にして接触面圧を高めて操作力を軽減する形態にすることがある。
【００３５】
そして、前記実施形態の中空撚線コイル体１３は「複数素線を密着巻きした複巻形態でロープ撚線機による複数素線の撚合によるコイル形態」が好ましい。この形態のものは極小曲げ時の素線間隙の発生がなく、かつ曲げからの復元性に優れるので、ワイヤロープＷＡを用いる医療用処置具の基本的性能のさらなる向上・安定ができる。
【００３６】
続いて図４を参照して本発明の他の実施形態の医療処置具１０である医療用ガイドワイヤを説明する。即ち、この図４のものは体外に出した手元操作部８を「押し・引き・回転」操作して先端処置部９を血管狭窄部に位置させて応分の治療に用いる医療用ガイドワイヤにして、前記操作力の機械的作動力の伝達要素となる主材の操作用ワイヤロープとしてワイヤロープＷＡが用いてある。なお、この実施形態のものはワイヤロープＷＡに樹脂コート１５が施してある。
【００３７】
この実施形態の医療用ガイドワイヤは回転追従性が極めて良く、かつ、太径素線５と細径素線６の組合せにより柔軟性を維持しながら押込み特性が高い特段の作用効果があり、術者による屈曲細血管への深部挿入性が極めて容易となり当該治療性を一段と向上する。なお、この図４実施形態のものは図４（Ｂ）に示す「ワイヤロープＷＡの下撚り下層２の中心素線７」を不存在にして当該部位を中空状態にして一段の軽量化と、その軽量化による操作性の向上を図る態様にすることがある。
【００３８】
なお、本発明の医療用処置具は前記の実施形態に限定されず、ワイヤロープＷＡは、太径素線５・細径素線６のいずれも、または、いずれか、或は下撚りの下層２の素線群のそれぞれを「素線群撚合の撚合線」で構成し、必要に応じてそのロープ外周をスエージング加工して仕上げる形態にすることがある。そして、操作用ワイヤロープを用いる総ての医療用処置具が包含される。
【００３９】
【発明の効果】
以上の説明のとおり、本発明の「操作用ワイヤロープを用いて成る医療用処置具」は、体腔内に挿入した先端処置部を体外に出した手元操作部で作動させて治療するにおいて、手元操作部による先端処置部の作動操作・作動コントロールが極めてし易く、的確迅速な諸治療が可能にして当該治療性・治療効果を特段に向上する有用な効果がある。
【図面の簡単な説明】
【図１】本発明１実施形態の操作用ワイヤロープの構造を示す横断面図
【図２】本発明の１実施形態の医療用処置具を示し、（Ａ）（Ｂ）はその全体正面図、（Ｃ）は（Ａ）（Ｂ）の部分正面断面図、（Ｅ）は他の形態の部分正面断面図
【図３】本発明の他の実施形態の医療用処置具を示し、（Ａ）はその構造説明の全体図、（Ｂ）（Ｃ）はその構造説明の部分図
【図４】本発明の他の実施形態を示し、（Ａ）はその全体正面図、（Ｂ）は（Ａ）の拡大横断面図
【図５】本発明の操作用ワイヤロープの性能試験の取り廻し状態の説明図
【符号の説明】
２下撚りの下層
３上撚りの外層
５太径素線
６細径素線
８手元操作部
９先端処置部
１０医療用処置具
１３中空撚線コイル体
１４インナーチューブ
１５樹脂コート
ＷＡ本発明の操作用ワイヤロープ
ＷＢ従来の操作用ワイヤロープ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a “medical treatment instrument using an operation wire rope” such as an endoscope treatment instrument disclosed in Patent Document 1 and a multifunctional surgical instrument disclosed in Patent Document 2.
[0002]
[Prior art]
The “medical treatment instrument using an operation wire rope” shown in Patent Documents 1 and 2, etc. is twisted with the lower twisted lower layer and the upper twisted outer layer twisted in opposite directions. The distal end treatment has a structure in which the “operating wire rope having a cross-twisted configuration” formed on the wire rope is inserted into the conduit and the proximal operation portion and the distal treatment portion are connected, and is inserted and set in the lesioned part in the body cavity. The hand operating part with the part positioned outside the body is operated to “push / pull / rotate”, and the operation wire rope functions as an operating force transmission element, and the distal treatment part is moved to “push / pull / rotate / catch”. It has a structure / function that activates it to give appropriate treatment.
[0003]
[Patent Document 1]
JP-A-8-126648 (Summary, FIGS. 1 to 3)
[Patent Document 2]
JP 2002-282261 A (summary, FIG. 1)
[0004]
[Problems to be solved by the invention]
The medical treatment instrument using the “operating wire rope” disclosed in the above-mentioned Patent Documents 1 and 2 and the like is an operation component that constitutes a mechanical element for transmitting an operation force from the hand operation unit to the distal treatment unit. Since the wire rope has the “cross-twisted configuration” described above, there are the following problems.
[0005]
That is, when the hand operating part is “push / pull / rotate” and the tip treatment part is “push / pull / rotate”, the operating force / operation amount (push / pull stroke) is reduced by the operation wire rope. However, the operability of the distal treatment section by an operator (such as a doctor who operates the treatment instrument) is poor.
[0006]
In addition, the rotational followability and responsiveness of the distal treatment section when rotating the hand operating section are poor, and the “wire twist” of the operation wire rope easily occurs due to the rotation operation, and this “torsion pool” is the limit. And is released at a stretch, causing a phenomenon that causes a sudden excessive rotation of the distal treatment section, impeding the therapeutic properties of the lesion.
[0007]
The present invention solves the above-mentioned problems of the prior art and provides a further high-quality “medical treatment instrument using an operation wire rope”.
[0008]
[Means for Solving the Problems]
The present invention for solving the above technical problem is as follows: "In a medical treatment instrument using an operation wire rope between a hand operation section and a distal treatment section, the operation wire rope is connected to a lower twist layer and an upper twist. The outer layer is a parallel twist twisted form in which the outer layers are twisted in the same direction, and the outer layer of the upper twist is an alternating arrangement of large-diameter strands and thin-diameter strands. 4 points of line contact between two strands of the lower layer and the thin strand of wire, and 3 points of line contact between the large strands of adjacent sides and one strand of the lower layer The basic structure is a structure in which a certain twisted structure is used and a resin coating is present or absent on the outer periphery of the outer layer. And the medical instrument of this invention which consists of the said basic structure employ | adopts the aspect shown to the following paragraph from the technical intention which aims at the further improvement of a specific effect. In addition, the medical treatment tool of the present invention includes a “medical guide wire having a wire rope as a main material”.
[0009]
That is, “a mode in which the entire or part of the operating wire rope having the above configuration is inserted into the conduit of the hollow stranded coil body” “at least a part of the outer periphery of the conduit is subjected to cutting or polishing, A mode in which a synthetic resin tube is inserted into the inner circumference of the conduit, a mode in which a plurality of indwelling devices are connected, a mode in which a swaging or die-drawing operation wire rope is used, or the hollow strand wire. In the case of using a coil body conduit, a mode in which the twisting direction of the operating wire rope and the winding direction of the hollow stranded coil body are combined in opposite directions is adopted.
[0010]
[Action]
The results of the performance comparison experiment of “the operation wire rope having the above-described configuration of the present invention (hereinafter referred to as wire rope WA)” and “the conventional operation wire rope having the cross-twist configuration (hereinafter referred to as wire rope WB)” are as follows. As shown in Tables 1-6.
[0011]
The following tables are measured comparison data of the wire ropes WA and WB that are subjected to a comparison experiment based on the same conditions of the routing state shown in FIG.
[0012]
[Table 1]

[0013]
[Table 2]

[0014]
[Table 3]

[0015]
[Table 4]

[0016]
[Table 5]

[0017]
[Table 6]

[0018]
In addition, the wire ropes WA and WB in the comparison experiments in the above-mentioned tables are respectively “with substantially the same diameter of the lower twist”, and the wire rope WB is “with the strands of the same diameter as the upper twist and the lower twist and the upper twist. A configuration in which the twists were cross-twisted, and the wire rope WA was subjected to a comparative experiment in the routing state illustrated in Table 1 with a “configuration in which the upper twist was an alternate combination of thick and thin wires and was twisted in parallel with the lower twist”. And the measurement characteristic of the said table | surface is the following definition.
Operation efficiency = Percentage output coefficient with F as the denominator and W as the numerator = Reciprocal of the operation efficiency Operation force = Tensile load operation amount of F = Displacement amount at the tip side Rotation followability = Response response at the tip side with respect to rotation at the hand [0019]
The following can be said from Tables 1 to 6 above. That is, the operation efficiency and the output coefficient as mechanical elements of the mechanical transmission force are higher in the wire rope WA than the wire rope WB. “The friction coefficient estimated from the chart is that the wire rope WB = 0.031 and the wire rope WA = 0.028 ", and the wire rope WA is superior to the wire rope WB in slidability in the conduit / body cavity.
[0020]
In addition, the wire rope WA is about 1/3 to 1/4 of the wire rope WB in any of the “variation widths of the operation force and the operation amount” when the operation is repeated. This characteristic makes it possible to significantly reduce the operating force and operation amount of the hand operating section for operating the distal treatment section of the medical treatment instrument in the same manner, and the wire rope WA has a particularly high performance than the wire rope WB. There is operability.
[0021]
Furthermore, the rotation follow-up performance is “In the first time, the wire rope WA starts to rotate with two rotations of 90 ° on the hand side, whereas the wire rope WB finally finally rotates with six rotations of 90 ° on the hand side. There is a defect phenomenon in which a peak that causes “residual twist” to dissipate at a stroke appears in the vicinity of 11 rotations of 90 ° rotation on the hand side. And after 100 times of endurance, the wire rope WA appears to rotate repeatedly, but the wire rope WB reveals this “extremely high undulation peak”, and the distal treatment section is operated by the hand operation section. The property means that “the wire rope WA is particularly smooth and stable than the wire rope WB”. The above main special effects exist.
[0022]
The above-mentioned good mechanical properties of the wire rope WA are inferred to be due to the following mechanism. That is, the wire rope WB of the conventional structure has a simple two-point to three-point contact form between adjacent strands (because the twisting directions of the lower twisted lower layer and the upper twisted outer layer are opposite to each other, the lower twisted lower layer The contact point between the strands and the strands of the outer layer of the upper twist is just a point contact), so when receiving a twisting force or pushing / pulling external force, “the mutual sliding of the strands, The transmission performance and transmission efficiency of the mechanical transmission force transmitted from one side to the other due to a phenomenon such as “opening of the line gap” is poor.
[0023]
However, since the wire rope WA has the twisted direction of the lower twisted lower layer and the upper twisted outer layer in parallel, and the upper twisted outer layer is an alternately arranged form of large-diameter strands and small-diameter strands, The large strand of the outer layer of the upper twist is a four-point contact between the two lower strands of the inner twist and the adjacent thin strands on both sides. A three-point contact between one strand of the twisted lower layer and a large-diameter strand on both sides adjacent to each other, and the three-point / four-point contact continues in the longitudinal direction of the wire rope (under-twisted lower layer And the twist direction of the outer layer of the upper twist is parallel). Therefore, the mechanical transmission force of the wire rope WA can be transmitted with extremely high efficiency and high performance by suppressing or preventing the defective phenomenon of the wire rope WB.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
First, the basic form of the wire rope WA of the present invention will be described with reference to FIG. That is, the wire rope WA is a wire rope in which an outer layer of an upper twist is provided on the outer periphery of a lower twisted lower layer in which a plurality of strands are twisted (the illustrated one is a 1 × 7 strand twist). the outer periphery of the lower layer 2 and outer layer 3 of the above twist in the twisted parallel is if configured twisted in the same direction, the outer layer 3 of the final twists is adjacent strands by alternately arranging径素line 5 and a small diameter wire 6 thick It is configured to twist if structure with mutual contact a.
[0025]
The large-diameter strand 5 forms a four-point contact form with “the outer periphery of the two strands of the lower twisted lower layer 2 and the outer periphery of the thin strand 6 on both sides”. The outer periphery of one strand of the twisted lower layer 2 and the outer periphery of the large-diameter strand 5 on both sides "are configured in a three-point contact form, and function as a mechanical element for power transmission for operation of the medical treatment instrument illustrated below. It ’s like that. The wire rope WA according to the embodiment shown in FIG. 1 functions as a machine element wire rope having various characteristics shown in Tables 1 to 6.
[0026]
Subsequently, an embodiment of a medical treatment instrument using a wire rope WA will be described with reference to FIGS. 2 and 3. 2A and 2B, the wire rope WA is used as a wire rope for power transmission for operation between the hand operating section 8 and the distal treatment section 9 which is inserted into the body cavity and performs appropriate treatment. A known medical treatment instrument 10 of an endoscopic treatment instrument is shown.
[0027]
Specifically, the medical treatment tool 10 of the endoscope treatment tool shown in FIGS. 2A and 2B expands or contracts the indwelling loop 11 of the distal treatment section 9 by pushing, pulling , or rotating the hand operation section 8. The wire rope WA of the present invention is used as an operation wire rope for causing the biopsy cup 12 to open or close, and this wire rope WA is “a flexible wire that is connected to the hand operation portion 8 and the distal treatment portion 9. It is penetrated by the hollow part of the hollow stranded wire coil body 13 ".
[0028]
The above embodiment of FIG. 2 has the above-mentioned specific action because the wire rope WA is used as an operating force transmission rope. In other words, the insertion of the distal treatment section 9 during the insertion and advancement into the blood vessel / body cavity is light and smooth without any stick slip, and by the hand operating section 8 after the distal treatment section 9 reaches the treatment site. The operability of various mechanical operations of the distal treatment section 9 is particularly easy to make compared with the conventional wire rope WB, and the treatment can be performed quickly and accurately.
[0029]
In addition, the thing of this FIG. 2 embodiment is resin (fluorine resin) in the hollow part inner periphery of the hollow stranded wire coil body 13 with the technical intention which aims at the further improvement of the said specific effect | action (refer FIG.2 (D) (E)). A mode in which an inner tube 14 of polyethylene, nylon, etc.) is inserted or a resin coating 15 is similarly applied to the outer periphery of the wire rope WA is adopted as necessary. In this aspect, since a metal-resin contact structure is used instead of a metal-metal contact structure, the slidability of the wire rope WA with respect to the hollow stranded wire coil body 13 is further improved, and the above-mentioned specific action is further enhanced. improves.
[0030]
Furthermore, in the configuration in which the inner tube 14 is inserted into the inner periphery of the hollow portion of the wire rope WA and the hollow stranded coil body 13, the wire rope WA and the hollow are compared with the embodiment in which the outer periphery of the wire rope WA is provided with the resin coating 15. By reducing the contact surface pressure with the inner circumferential convex shape of the stranded coil body 13, the operation feeling “suppresses the occurrence of stick-slip due to metal-to-metal contact” due to wear of the resin is further improved, and a constant operating force Can be stable for a longer period of time.
[0031]
When the “multi-winding form in which a plurality of strands are closely wound” is used for the hollow stranded coil body 13, the coil body of the single-wire closely wound form is bent on the outside of the coil wire having a large curvature radius. On the other hand, since the strands move relative to each other and are not separated, the operation wire rope WA is not pulled into the coil body. Therefore, when an endoscopic treatment tool is inserted into the body, the operator's intention to operate the hand operating section 8 without causing expansion / contraction deformation of the indwelling loop 11 of the distal treatment section 9 due to the influence of the bending state. It is possible to perform a good operation that adapts appropriately.
[0032]
Next, a medical treatment tool 10 according to another embodiment of the present invention will be described with reference to FIG. That is, what is shown in FIG. 3 is a known endoscopic treatment instrument that operates the clip 16 of the distal treatment section 9 by pushing, pulling, and rotating the slider 17 of the hand operation section 8. Similarly, “the hand operating section 8 and the distal treatment section 9 are connected by a hollow stranded wire coil body 13, and a wire rope WA for operating force transmission is inserted through the coil body 13. Note that FIG. A) is a single-mounting form of the clip 16, and FIG. 3B is a three-mounting form of the clip 16.
[0033]
The medical treatment instrument 10 according to the embodiment shown in FIG. 3 can enjoy the same effects as those according to the embodiment shown in FIG. And the thing of the said continuous form has the following special effect | action. That is, the wire rope WA has a structure in which the “low elongation” rope due to the parallel twist structure and a structure in which the relative movement of each element wire does not occur when bent and the coil wires are not separated from each other. The amount of operation can be further reduced by using together with the “hollow stranded wire coil body 13” having a small amount of shrinkage even when receiving. That is, it becomes possible to remove the clip with a small amount of operation, and conversely, if it is the same amount of operation, there is a special effect of increasing the number of attached clips, and one operation in the operator's body Can treat more wounds.
[0034]
Incidentally, the medical treatment instrument 10 of the above FIGS. 2 and 3 embodiment is a technology intended to improve the insertability of the stage improving into the body cavity, FIG. 3 (C) illustrate the manner hollow stranded-wire coil 13 The outer periphery of the wire rope may be mechanically ground to form a smooth outer periphery or a tapered tube shape to make a rigid or flexible gradual change form. Further, although not shown, the outer periphery of the wire rope WA shown in FIG. 1 is polished and drawn. In the form of a smooth outer periphery and "the amount of rope elongation is reduced by being compressed to the center by drawing", the exposed form of the wire rope WA without the hollow stranded coil body 13, or the twist direction of the wire rope WA And the winding direction of the hollow stranded coil body 13 may be opposite to each other to increase the contact surface pressure and reduce the operating force.
[0035]
And the hollow stranded coil body 13 of the said embodiment has preferable "the coil form by twisting of the multiple strands by a rope twisting machine with the multiple winding form which closely wound the multiple strands". In this form, there is no generation of a wire gap at the time of minimal bending, and the resilience from bending is excellent, so that the basic performance of the medical treatment instrument using the wire rope WA can be further improved and stabilized.
[0036]
Next , a medical guide wire that is a medical treatment instrument 10 according to another embodiment of the present invention will be described with reference to FIG. That is, the one shown in FIG. 4 is operated as a medical guide wire used for appropriate treatment by “pushing / pulling / rotating” the hand operating part 8 that has been taken out of the body to position the distal treatment part 9 at the vascular stenosis part. The wire rope WA is used as an operation wire rope of the main material that serves as a transmission element for the mechanical operation force of the operation force. In this embodiment, a resin coat 15 is applied to the wire rope WA.
[0037]
The medical guide wire of this embodiment has a very good rotational followability, and has a special action effect with high push-in characteristics while maintaining flexibility by the combination of the large diameter wire 5 and the small diameter wire 6. The ability of a person to insert a deep part into a bent thin blood vessel becomes extremely easy, and the treatment is further improved. In addition, the thing of this FIG. 4 embodiment does not exist "the core strand 7 of the lower twisted lower layer 2 of the wire rope WA" shown in FIG. There is a case where the operability is improved by the weight reduction.
[0038]
The medical treatment instrument of the present invention is not limited to the above-described embodiment, and the wire rope WA is either the large-diameter strand 5 or the small-diameter strand 6 or any one, or the lower twisted lower layer. Each of the two strand groups may be constituted by “strand strands of strands”, and the outer circumference of the rope may be swaged and finished as necessary. And all the medical treatment tools using an operation wire rope are included.
[0039]
【The invention's effect】
As described above, the “medical treatment instrument using the operation wire rope” according to the present invention is operated by treating the distal treatment section inserted into the body cavity by operating with the hand operation section that is out of the body. It is very easy to operate and control the distal treatment section by the operation section, and there is a useful effect that enables various treatments to be performed accurately and quickly, and the therapeutic properties and therapeutic effects are particularly improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the structure of an operation wire rope according to an embodiment of the present invention. FIG. 2 shows a medical treatment instrument according to an embodiment of the present invention, and FIGS. , (C) is a partial front sectional view of (A) and (B), (E) is a partial front sectional view of another embodiment, and FIG. 3 shows a medical treatment instrument according to another embodiment of the present invention. ) Is an overall view of the structure description, (B) and (C) are partial views of the structure description. FIG. 4 shows another embodiment of the present invention, (A) is an overall front view, and (B) is ( A) Expanded cross-sectional view of FIG. 5 [FIG. 5] Explanatory drawing of the operation state of the performance test of the wire rope for operation of the present invention [Explanation of symbols]
2 Lower twisted layer 3 Upper twisted outer layer 5 Large diameter strand 6 Thin diameter strand 8 Hand operating section 9 Tip treatment section 10 Medical treatment tool 13 Hollow twisted wire coil body 14 Inner tube 15 Resin coat WA Operation of the present invention Wire rope WB Conventional wire rope for operation

Claims

Between the operation portion and the distal end treatment portion parallel, the medical treatment instrument comprising using operating wire rope, which the operating wire ropes and stranding the outer layer of the final twists and a lower twist in the same direction The twisted and twisted form is used, and the outer layer of the upper twist is an alternating arrangement of large-diameter strands and thin-diameter strands, and the large-diameter strands are formed by the adjacent thin-diameter strands on both sides and the lower two strands. It is a four-point line contact, and the small-diameter wire has a twisted structure that is a three-point line contact between the large-diameter wire on the adjacent both sides and one lower-layer wire, and on the outer periphery of the outer layer A medical treatment instrument characterized by having a structure in which a resin coating is present or absent .

The medical treatment instrument which connected between the hand operation part and the front-end | tip treatment part with the flexible hollow strand wire coil body, and penetrated the wire rope for operation of Claim 1 in this flexible hollow strand wire coil body The operating rope is pushed, pulled or rotated, and the operation rope detention loop provided in the distal treatment section is expanded or contracted by the operation transmitting action of the operating rope. medical treatment instrument to be.

The medical treatment instrument which connected between the hand operation part and the front-end | tip treatment part with the flexible hollow strand wire coil body, and penetrated the wire rope for operation of Claim 1 in this flexible hollow strand wire coil body The medical device is characterized in that the biopsy cup provided in the distal treatment section is opened and closed by pushing, pulling, or rotating the hand operation section, and the operation transmission action of the operation rope . Treatment tool.

The medical treatment instrument which connected between the hand operation part and the front-end | tip treatment part with the flexible hollow strand wire coil body, and penetrated the wire rope for operation of Claim 1 in this flexible hollow strand wire coil body The medical treatment characterized in that the clip provided in the distal treatment section is operated by pushing, pulling or rotating the hand operation section and operating the action transmission of the operation rope. Ingredients.

The twist direction of the operation wire rope and the winding direction of the flexible hollow stranded coil body are opposite to each other, and the contact surface between the operation wire rope and the flexible hollow stranded coil body The medical treatment tool according to any one of claims 2 to 4, wherein the operating force is reduced by increasing the pressure .

In a medical guide wire formed by coating a wire rope with a resin, the wire rope has a parallel twist twisted form in which a lower twisted lower layer and an upper twisted outer layer are twisted in the same direction, and the upper twisted outer layer is a large diameter element. The large-diameter element wire is a four-point line contact between the fine-element element wire on both adjacent sides and the lower two element wires, and the small-diameter element wire Is a medical guide wire characterized by having a twisted structure that is a three-point line contact between the large-diameter strands on adjacent sides and a single underlying strand .