JP3989989B2

JP3989989B2 - Endoscopic treatment tool and its processing device

Info

Publication number: JP3989989B2
Application number: JP24842096A
Authority: JP
Inventors: 正弘浦野; 泰大越
Original assignee: Olympus Corp
Current assignee: Olympus Corp
Priority date: 1996-09-19
Filing date: 1996-09-19
Publication date: 2007-10-10
Anticipated expiration: 2016-09-19
Also published as: JPH1085229A

Description

【０００１】
【発明の属する技術分野】
本発明は、内視鏡的治療に利用される金属撚り線にて形成された内視鏡用処置具とその加工装置に関する。
【０００２】
【従来の技術】
従来、内視鏡的処置として高周波によりポリープ等を切除するために用いられる内視鏡用処置具は、その先端部が極めて細い撚り線ワイヤを図１３および図１４に示す加工装置および方法によって作られているものがある。この場合、図１に示すように、内視鏡用処置具の先端部４の望ましい形状として、正面が操作用ワイヤ１の軸心に対して左右対称であり、この操作用ワイヤ１を９０度だけ回した状態で、操作用ワイヤ１および先端部４が図２のように同一平面状であることが挙げられる。
【０００３】
しかしながら、このような形状をつくるにあたり、図３に示すように、素材５は操作用ワイヤ１の先端側を細い撚り線ワイヤ２でループ状のループ部４Ａを形成するとともに、細い撚り線ワイヤ２の各両端を接続用パイプ３で固定して形成されている。この素材５のループ部４Ａを拡げて図１３の平面図で示す加工装置のベース板１０６に固着した型１０３にセッティングするとともに、操作用ワイヤ１（あるいは接続用パイプ３）をチャックにて挟持するとともに、牽引機構１０７にて引張り力（すなわち、撚り線ワイヤ２に張力）を付与する。ついで、型１０１をシリンダ１０５にて移動して、型１０１の先端側に形成された溝１０１ａおよび型１０３の中心突部１０３ａにて、図１４に示すように、撚り線ワイヤ２の中央部を変形させる。この場合、図１４で示す型１０３の両肩部１０３ｂおよび両側部１０３ｃでも、図示を省略した押圧手段にてそれぞれ撚り線ワイヤ２を押圧し、成形するというものである。
【０００４】
【発明が解決しようとする課題】
上記において、既述のように図３に示した素材５の各両端における基部側は、１本の撚り線ワイヤ２の両端を平行に揃えて、接続用パイプ３で固定した状態であり、撚り線ワイヤ２の中央部に相当する先端部４は撚り線の状態になっている為に、先端部４には回転する（即ち、捩じれようとする）作用が生ずることになる。従って、型１０３に対する素材５のセッティング時には、図１７で示すように、型１０３の中心突部１０３ａに対して素材５が望ましい位置（ハッチングで示す素材５の位置）から捩じれた状態（２点鎖線で示す位置）となったり、あるいは、素材５の先端側と基部側とがベース板１０６に対して水平にはならずに、斜めに下がったり（図１５参照）、斜めに上がったり（図１６参照）する。
【０００５】
この為、成形後に内視鏡用処置具として使用する際、図４の示すように、成形した先端部４をコイルシース６側に引き込んだときには、先端部４はコイルシース６に対して捩じれるように、コイルシース６内に入って行くことになる。よって、内視鏡用処置具の先端部４が望ましい形状の場合は、図１９の如くに例えばポリープ７の基部７ａに対して良好に引っ掛け易くなるが、先端部４が捩じれたり、斜めになる形状の場合は、図２０のようにポリープ７の基部７ａに対して引っ掛けにくくなり、内視鏡用処置具の使用時に先端側の操作をしにくくする可能性があり、形状に細心の注意が払われていた。この為、生産性の向上が図りにくいものであった。
【０００６】
また、図１７で示した中心突部１０３ａにて、撚り線ワイヤ２の中央部を凸状に成形する場合、図１８に示すように、該中心突部１０３ａの頂上面１０３ａ₁に撚り線ワイヤ２が押し付けられ、ついで両肩１０３ａ₂にて撚り線ワイヤ２に型１０１による押圧力が付与される。この為、両肩１０３ａ₂にて撚り線ワイヤ２が折り曲げられ、この折り曲げによって、内視鏡処置具先端中央凸部の内側が鋭角（角度θ₁）的となって狭くなるとともに、両側も拡がって角度θ₂となって平行とはならず（図２１参照）、ポリープ７を高周波にて切除する際の切れ具合が低下しやすいものであった。
【０００７】
本発明は、上記従来の問題点に鑑みてなされたもので、請求項１に係る発明の課題は、先端部を望ましい形状に保つことができ、ポリープ等の切除時の操作を容易にした内視鏡用処置具を提供することである。
請求項２に係る発明の課題は、内視鏡用処置具の先端部を望ましい形状に安定して加工することができる内視鏡用処置具の加工装置を提供することである。
【０００８】
【課題を解決するための手段】
上記課題を解決する為に、請求項１に係る発明は、内視鏡的治療に利用される金属撚り線にて形成された内視鏡用処置具において、内視鏡用処置具の先端部を１本の金属撚り線によって角度１８０度のＵターンで円弧をなして平行に延長して形成した小開口部と、この小開口部の平行な前記金属撚り線をそれぞれ外方に向かって屈曲させた曲がり部を有するとともに、前記小開口部の平行に延長した金属撚り線の方向で前記金属撚り線を揃えて結束しこの部分に略三角形状の結束部分を形成した拡口部とを有し、前記小開口部の外幅と同一の溝幅に設定した溝を有する移動型と、小開口部の内幅と同一の幅に設定した中間型とにより円弧部分から延長された金属撚り線を挟んで金属撚り線の内側をしごいた後、移動型の押圧力を解除する成形加工時における押圧力が解除される際に前記円弧部分に金属撚り線のしごきによる各素線の応力の戻り分が溜まることにより膨らんで、前記小開口部における円弧部分の厚さ寸法が前記金属撚り線の直径寸法より大きく形成されるとともに、前記結束部分と拡口部と小開口部とが同一平面状になっていることを特徴とする。
請求項２に係る発明は、先端部を１本の金属撚り線によって角度１８０度のＵターンで円弧をなして平行に延長して形成した小開口部と、この小開口部の平行な前記金属撚り線をそれぞれ外方に向かって屈曲させた曲がり部を有するとともに前記金属撚り線を揃えて結束した結束部分を形成した拡口部とを有する内視鏡用処置具の加工装置において、基台に固着されるとともに、小開口部の内幅と同一幅に設定した中央突部、中央突部の基部より両側に形成した傾斜面、両肩部および両側部が形成された固定型と、該固定型に対向して進退自在かつ押圧自在に配された小開口部の外幅と同一の溝幅に設定した溝を有する移動型と、前記固定型と前記移動型との中間に前記固定型に対向して移動自在に配され、且つ、前記移動型より弱い押圧力にて前記固定型に対向する方向に付勢されているとともに、金属撚り線をフックの肩部で保持し小開口部の内幅と同一の幅に設定した中間型と、を備え、前記移動型は前記固定型の方向へ移動する途中で前記中間型とにより円弧部分を有する前記小開口部を成形し、その後前記移動型は前記中間型の付勢力に打ち勝って前記中間型と一体になって前記固定型の方向へ移動して、前記固定型とにより前記拡口部の曲がり部を成形することをことを特徴とする。
【０００９】
請求項１に係る発明の作用では、内視鏡的治療に利用される金属撚り線にて形成された内視鏡用処置具において、内視鏡用処置具の先端部を１本の金属撚り線によって角度１８０度のＵターンで円弧をなして平行に延長して形成した小開口部と、この小開口部の平行な前記金属撚り線をそれぞれ外方に向かって屈曲させた曲がり部を有するとともに、前記小開口部の平行に延長した金属撚り線の方向で前記金属撚り線を揃えて結束しこの部分に略三角形状の結束部分を形成した拡口部とを有し、前記小開口部の外幅と同一の溝幅に設定した溝を有する移動型と、小開口部の内幅と同一の幅に設定した中間型とにより円弧部分から延長された金属撚り線を挟んで金属撚り線の内側をしごいた後、移動型の押圧力を解除する成形加工時における押圧力が解除される際に前記円弧部分に金属撚り線のしごきによる各素線の応力の戻り分が溜まることにより膨らんで、前記小開口部における円弧部分の厚さ寸法が前記金属撚り線の直径寸法より大きく形成されるとともに、前記結束部分と拡口部と小開口部とが同一平面状になっていることにより、撚り線の応力が解除され、円弧部分の形状および前記結束部分と拡口部と小開口部との同一平面状が維持される。
請求項２に係る発明によれば、先端部を１本の金属撚り線によって角度１８０度のＵターンで円弧をなして平行に延長して形成した小開口部と、この小開口部の平行な前記金属撚り線をそれぞれ外方に向かって屈曲させた曲がり部を有するとともに前記金属撚り線を揃えて結束した結束部分を形成した拡口部とを有する内視鏡用処置具の加工装置において、基台に固着されるとともに、小開口部の内幅と同一幅に設定した中央突部、中央突部の基部より両側に形成した傾斜面、両肩部および両側部が形成された固定型と、該固定型に対向して進退自在かつ押圧自在に配された小開口部の外幅と同一の溝幅に設定した溝を有する移動型と、前記固定型と前記移動型との中間に前記固定型に対向して移動自在に配され、且つ、前記移動型より弱い押圧力にて前記固定型に対向する方向に付勢されているとともに、金属撚り線をフックの肩部で保持し小開口部の内幅と同一の幅に設定した中間型と、を備え、前記移動型は前記固定型の方向へ移動する途中で前記中間型とにより円弧部分を有する前記小開口部を成形し、その後前記移動型は前記中間型の付勢力に打ち勝って前記中間型と一体になって前記固定型の方向へ移動して、前記固定型とにより前記拡口部の曲がり部を成形することにより、内視鏡用処置具の小開口部形状を成形し保持してから、他の拡口部の曲がり部を成形する。
【００１０】
【発明の実施の形態】
図１〜図１２は発明の実施の形態を示し、図１は内視鏡用処置具の先端部の正面図、図２は内視鏡用処置具の先端部の側面図、図３は内視鏡用処置具の素材の先端部の正面図、図４は内視鏡用処置具をコイルシースに組み込んだ状態図、図５は内視鏡用処置具の加工装置の左側面図、図６は内視鏡用処置具の加工装置の正面図、図７は内視鏡用処置具の加工装置の右側面図、図８は加工装置の中間型のフック部分を示す斜視図、図９は加工装置の移動型、中間型および固定型の関係を示す斜視図、図１０は内視鏡用処置具の加工工程図、図１１は内視鏡用処置具の小開口部の加工状況図、図１２は内視鏡用処置具の拡口部の加工状況図である。
【００１１】
本発明の実施の形態では、内視鏡用処置具は、図３に示す素材５から、後に説明する加工装置と方法により、その先端部を図１および図２に示す形状に成形される。この内視鏡用処置具は、操作用ワイヤ１の先端側に細い撚り線ワイヤ２からなる先端部４を形成している。先端部４は、最先端を円弧状に形成して１８０度Ｕターンした平行な撚り線ワイヤ２からなる小開口部４ａと、この小開口部４ａの平行な撚り線ワイヤ２をそれぞれ外方に向かって屈曲し、さらに小開口部４ａの平行な撚り線ワイヤ２の方向で、撚り線ワイヤ２を揃えて接続用パイプ３で結束し、この部分に略三角形状の拡口部４ｂとからなっている。この内視鏡用処置具は、図２に示すように、側面から見ると、小開口部４ａと拡口部４ｂと接続用パイプ３とが、一直線上にあり、同一平面状をなしている。また、最先端の頂部２ｂの円弧状の部分の厚さｔは、撚り線ワイヤ２の直径ｄよりも、膨らみにより大きく形成されている。
【００１２】
つぎに、内視鏡用処置具の加工装置について説明する。図５〜図７において、固定型１３は、固定台１４に固着されている。固定台１４は、図示を省略した水平台から垂直に立設されている。固定型１３は、中央突部１３ａを形成しており、この幅は、内視鏡用処置具の小開口部４ａの内幅ｗ（図１参照）と同一に設定されている。中央突部１３ａの基部１３ｂより両側に傾斜面１３ｃが形成され、さらに両肩部１３ｄおよび両側部１３ｅが形成されている。固定型１３に対向して、移動型１１が進退自在かつ押圧自在に配設されている。移動型１１には、これを進退自在かつ押圧自在に駆動するシリンダ１５が連設され、取付け具１６を介して、固定台１４に取着されている。移動型１１の中央先端には、溝１１ａが形成されており、その溝幅は、内視鏡用処置具の小開口部４ａの外幅ｗ＋２ｄ（図１参照）と同一に設定されている。さらに、溝１１ａの両肩部１１ｂから両側に、固定型１３の傾斜面１３ｃに平行な傾斜面１１ｃが形成されている。
【００１３】
固定型１３と移動型１１との中間には、中間型１２が配設されている。中間型１２の幅は、固定型１３の中央突部１３ａと同様に、内視鏡用処置具の小開口部４ａの内幅ｗ（図１参照）と同一に設定されている。中間型１２は、その基部を２枚の摺動板１８に挟持されて一体的に固着されている。摺動板１８は、固定台１４に固着されたガイド１７に摺動自在に嵌装しており、ガイド１７内に装着されたコイルバネ１９により上方に付勢されている。コイルバネ１９の弾発力は、シリンダ１５の押圧力より弱く設定されており、中間型１２に移動型１１が当接して下降した場合には、中間型１２は移動型１１と一体になって下降する。図８に示すように、中間型１２は、先端部にフック１２ａを形成し、素材５の撚り線ワイヤ２を引っ掛けることができるようになっている。
【００１４】
素材５は、既に説明したように、図３に示す形状をしており、操作用ワイヤ１と撚り線ワイヤ２からなるループ部４Ａとを、接続用パイプ３により連結して構成されている。この素材５のループ部４Ａを、中間型１２のフック１２ａに引っ掛けて、操作ワイヤ１の中途の所定の位置に錘２０を取着し、撚り線２に張力を与えている。
【００１５】
つぎに、上記加工装置を用いた内視鏡用処置具の製造方法を説明する。まず、素材５のループ部４Ａを２つ折りにして、軽い曲がりぐせをつける。図９に示すように、この２つ折りした部分の撚り線ワイヤ２を、中間型１２のフック１２ａに掛け、撚り線ワイヤ２の両側は、固定型１３の両肩部１３ｄに掛ける。さらに、図５および図６に示したように、錘２０を操作ワイヤ１に取着し、撚り線ワイヤ２に張力を付与する。この状態が、図１０（ａ）の工程図に図示されている。また、図１１に示すように、撚り線ワイヤ２をフック１２ａに掛けたとき、撚り線ワイヤ２の中央部には、円弧Ｒが形成されている。
【００１６】
移動型１１を下降させ、中間型１２のフック１２ａに掛けられた撚り線ワイヤ２に、移動型１１の溝１１ａの両肩部１１ｂが接触し、撚り線ワイヤ２は、中間型１２に付勢された弾発力により支持されているので、円弧Ｒが形成された状態で、かつフック１２ａの両肩部１２ｂに当接した状態で、移動型１１の両肩部１１ｂにより、フック１２ａの両側面１２ｃに押し当てられる。この状態が、図１０（ｂ）の工程図および図１１に図示されている。
【００１７】
移動型１１がさらに下降すると、移動型１１の押圧力は中間型１２の弾発力に打ち勝って、フック１２ａも下降する。撚り線ワイヤ２の円弧Ｒは形成されたまま、フック１２ａと一緒に下降する。やがて、フック１２ａの下面が固定型１３の中央突部１３ａの上面に当接する。移動型１１の両肩部１１ｂが、撚り線ワイヤ２（すなわち、撚り線ワイヤ２を撚り構成する各素線）を引っ張りながら、固定型１３との間で折り曲げ変形させる。最後に、図１２に示すように、移動型１１の斜面１１ｃが、固定型１３の斜面１３ｃに、撚り線ワイヤ２を挟んで当接し、撚り線ワイヤ２の曲がり部２ａが押圧成形される。このとき、フック１２ａの両肩部１２ｂで、撚り線２の内側がしごかれ、また、円弧Ｒは、曲率が僅かに小さく（曲率半径は大きく）なる程度である。この場合、図５で示す固定型１３の両肩部１３ｄおよび両側部１３ｅも、図示を省略した押圧手段にてそれぞれ撚り線ワイヤ２を押圧し、成形する。この状態が、図１０（ｃ）の工程図に図示されている。
【００１８】
つぎに、移動型１１が上昇すると、中間型１２および撚り線ワイヤ２も追従して上昇する。また、図５で示す固定型１３の両肩部１３ｄおよび両側部１３ｅを押圧していた押圧手段も復帰する。この状態が、図１０（ｄ）の工程図に図示されている。さらに、移動型１１が上昇すると、中間型１２および撚り線ワイヤ２が停止し、移動型１１から撚り線ワイヤ２が離脱する。この状態が、図１０（ｅ）の工程図に図示されている。
【００１９】
このとき、撚り線ワイヤ２の曲がり部２ａの押圧力が解除される。押圧力が解除されることにより、撚り線ワイヤ２を撚り構成する各素線の応力が解除されるので、各素線には、図１２に示す矢印方向に戻ろうとする力が作用する。フック１２ａの両肩部１２ｂでしごかれた撚り線ワイヤ２の断面形状が、ほぼ保たれた状態で、頂部２ｂの円弧Ｒが形成された個所に、各素線の戻り分が溜まり、頂部２ｂを側方からみたとき、図２に示すように、頂部２ｂの厚さｔは、撚り線ワイヤ２の直径ｄよりも僅かに膨らむ。この膨らんだ状態で、頂部２ｂの円弧形状が維持されるとともに、円弧Ｒに続く平行部２ｃの平行状態が維持される。また、撚り線２の応力が解除されているので、小開口部４ａと拡口部４ｂと接続パイプ３とが同一平面状に形成される。以上により、図１および図２に示すように、望ましい形状をした内視鏡用処置具を得ることができる。
【００２０】
本発明の実施の形態によれば、頂部の膨らみにより、円弧形状が維持され、小開口部と拡口部とからなる先端部と接続用パイプとが同一平面状になり、望ましい形状となった内視鏡用処置具を得ることができる。また、中間型を設けて、内視鏡用処置具の小開口部を先に成形し、その後拡口部を成形するように構成したので、上記先端部を望ましい形状に安定して加工することができる内視鏡用処置具の加工装置を提供することができる。
【００２１】
本発明の実施の形態では、加工装置を垂直に構成して、錘の重力により、撚り線に張力を付与しているが、加工装置は水平に構成してもよく、その場合は、操作ワイヤを滑車に掛けて錘を吊るし、重力が水平方向に働くようにすればよい。また、錘に替えて、エアーシリンダにより張力を付与するようにしてもよい。また、中間型の押圧力をコイルバネにより付勢しているが、エアーシリンダにより押圧力を付勢するようにしてもよい。
【００２２】
【発明の効果】
請求項１に係る発明によれば、成形加工時における押圧力が解除される際に円弧部分に各素線のしごきによる応力の戻り分が溜まることにより膨らんで小開口部における円弧部分の厚さ寸法が金属撚り線の直径寸法より大きく形成され、円弧部分の形状および結束部分と拡口部と小開口部との同一平面状が維持されるので、先端部を望ましい形状に保つことができ、ポリープ等の切除時の操作を容易に行うことができる。
請求項２に係る発明によれば、移動型は前記固定型の方向へ移動する途中で中間型とにより前記小開口部を成形し、その後移動型は中間型の付勢力に打ち勝って中間型と一体になって固定型の方向へ移動して、固定型とにより拡口部の曲がり部を成形するので、内視鏡用処置具の先端部を望ましい形状に安定して加工することができる。
【図面の簡単な説明】
【図１】発明の実施の形態の内視鏡用処置具の先端部の正面図である。
【図２】発明の実施の形態の内視鏡用処置具の先端部の側面図である。
【図３】発明の実施の形態の内視鏡用処置具の素材の先端部の正面図である。
【図４】発明の実施の形態の内視鏡用処置具をコイルシースに組み込んだ状態図である。
【図５】発明の実施の形態の内視鏡用処置具の加工装置の左側面図である。
【図６】発明の実施の形態の内視鏡用処置具の加工装置の正面図である。
【図７】発明の実施の形態の内視鏡用処置具の加工装置の右側面図である。
【図８】発明の実施の形態の加工装置の中間型のフック部分を示す斜視図である。
【図９】発明の実施の形態の加工装置の移動型、中間型および固定型の関係を示す斜視図である。
【図１０】発明の実施の形態の内視鏡用処置具の加工工程図である。
【図１１】発明の実施の形態の内視鏡用処置具の小開口部の加工状況図である。
【図１２】発明の実施の形態の内視鏡用処置具の拡口部の加工状況図である。
【図１３】従来技術の内視鏡用処置具の加工装置の平面図である。
【図１４】従来技術の内視鏡用処置具の加工装置の平面図である。
【図１５】従来技術の不具合を示す加工装置の側面図である。
【図１６】従来技術の不具合を示す加工装置の側面図である。
【図１７】従来技術の不具合を示す図１３のＸ矢視図である。
【図１８】従来技術の図１３のＹ部拡大図である。
【図１９】従来技術の望ましい形状の処置具を掛けた状態を示す図である。
【図２０】従来技術の望ましくない形状の処置具を掛けた状態を示す図である。
【図２１】従来技術の内視鏡用処置具の小開口部の不具合を示す図である。
【符号の説明】
１操作ワイヤ
２撚り線ワイヤ
２ｂ頂上部
３接続用パイプ
４先端部
４ａ小開口部
４ｂ拡口部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscopic treatment tool formed of a metal strand used for endoscopic treatment and a processing apparatus therefor.
[0002]
[Prior art]
Conventionally, an endoscopic treatment tool used for excising a polyp or the like with a high frequency as an endoscopic treatment is made by using a processing apparatus and method shown in FIGS. There is something that has been. In this case, as shown in FIG. 1, as a desirable shape of the distal end portion 4 of the endoscope treatment tool, the front surface is symmetrical with respect to the axial center of the operation wire 1, and the operation wire 1 is 90 degrees. It is mentioned that the operation wire 1 and the distal end portion 4 are coplanar as shown in FIG.
[0003]
However, in making such a shape, as shown in FIG. 3, the material 5 forms a loop-shaped loop portion 4 </ b> A with the thin stranded wire 2 on the distal end side of the operation wire 1, and the thin stranded wire 2. Each end of each is fixed by a connecting pipe 3. The loop portion 4A of the material 5 is expanded and set on the mold 103 fixed to the base plate 106 of the processing apparatus shown in the plan view of FIG. 13, and the operation wire 1 (or connection pipe 3) is held by the chuck. At the same time, the pulling mechanism 107 applies a tensile force (that is, tension to the stranded wire 2). Next, the mold 101 is moved by the cylinder 105, and the central portion of the stranded wire 2 is moved at the groove 101a formed on the tip side of the mold 101 and the central protrusion 103a of the mold 103 as shown in FIG. Deform. In this case, both the shoulder portions 103b and both side portions 103c of the mold 103 shown in FIG. 14 are each formed by pressing the stranded wire 2 by pressing means (not shown).
[0004]
[Problems to be solved by the invention]
In the above, as described above, the base side at each end of the material 5 shown in FIG. 3 is in a state in which both ends of one stranded wire 2 are aligned in parallel and fixed by the connecting pipe 3. Since the distal end portion 4 corresponding to the central portion of the wire 2 is in a stranded state, the distal end portion 4 is rotated (ie, twisted). Therefore, when the material 5 is set to the mold 103, as shown in FIG. 17, the material 5 is twisted from the desired position (the position of the material 5 indicated by hatching) with respect to the central protrusion 103a of the mold 103 (two-dot chain line). Or the tip side and the base side of the material 5 do not become horizontal with respect to the base plate 106 but fall diagonally (see FIG. 15) or rise diagonally (see FIG. 16). )
[0005]
Therefore, when used as an endoscope treatment tool after molding, as shown in FIG. 4, when the molded distal end portion 4 is pulled toward the coil sheath 6, the distal end portion 4 is twisted with respect to the coil sheath 6. Then, it goes into the coil sheath 6. Therefore, when the distal end portion 4 of the endoscope treatment tool has a desired shape, it is easy to be easily hooked to the base portion 7a of the polyp 7, for example, as shown in FIG. 19, but the distal end portion 4 is twisted or slanted. In the case of the shape, as shown in FIG. 20, it is difficult to be hooked on the base portion 7a of the polyp 7, and there is a possibility that it is difficult to operate the distal end side when using the endoscope treatment tool. Had been paid. For this reason, it was difficult to improve productivity.
[0006]
Further, when the central portion of the stranded wire 2 is formed in a convex shape at the central protrusion 103a shown in FIG. 17, the stranded wire is formed on the top surface 103a ₁ of the central protrusion 103a as shown in FIG. 2 is pressed, and then the pressing force by the mold 101 is applied to the stranded wire 2 at both shoulders 103a ₂ . For this reason, the stranded wire 2 is bent at both shoulders 103a ₂ , and by this bending, the inner side of the center convex portion of the endoscope treatment instrument becomes narrow at an acute angle (angle θ ₁ ), and both sides also expand. Therefore, the angle θ ₂ was not parallel (see FIG. 21), and the degree of cutting when the polyp 7 was excised at high frequency was likely to be reduced.
[0007]
The present invention has been made in view of the above-described conventional problems, and an object of the invention according to claim 1 is that the distal end portion can be maintained in a desired shape, and the operation at the time of excision of a polyp or the like is facilitated. An object of the present invention is to provide an endoscopic treatment tool.
The subject of the invention which concerns on Claim 2 is providing the processing apparatus of the treatment tool for endoscopes which can process the front-end | tip part of the treatment tool for endoscopes to a desired shape stably.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an invention according to claim 1 is directed to an endoscope treatment tool formed of a metal strand used for endoscopic treatment, and a distal end portion of the endoscope treatment tool. A small opening formed by extending the wire in parallel by forming a circular arc with a U-turn at an angle of 180 degrees with a single metal strand, and bending the metal strand parallel to the small opening outward And a widened portion in which the metal stranded wires are aligned and bundled in the direction of the metal stranded wire extending in parallel with the small opening and a substantially triangular binding portion is formed in this portion. And a metal stranded wire extended from the arc portion by a movable die having a groove set to the same groove width as the outer width of the small opening and an intermediate die set to the same width as the inner width of the small opening. across the after squeezing the inner metal strands, forming for releasing the pressing force of the mobile Inflated by the fact that the return portion of the stress of the wires due to ironing of the metal strands is accumulated in the arcuate portion when the pressing force at the time of factory is released, the thickness dimension of the circular arc portion in the small opening of the metal It is formed larger than the diameter dimension of the stranded wire, and the bundling portion, the widened portion, and the small opening portion are coplanar.
According to a second aspect of the present invention, there is provided a small opening formed by extending a tip portion in parallel by forming a circular arc with a U-turn having an angle of 180 degrees by a single metal strand, and the metal parallel to the small opening. in the processing apparatus of the endoscope treatment instrument having a拡口portion forming a unity moiety binding to align the metal strands with wire strands to have a bent portion which is bent outward, respectively, group Rutotomoni is fixed to the base, the center projection set in the inner width and the same width of the small opening, the inclined surface formed on both sides than the base of the center projection, and both shoulder and fixed to both side portions are formed, The movable mold having a groove set to have the same groove width as the outer width of the small opening disposed so as to be able to advance and retreat and press freely so as to face the fixed mold, and the fixed mold between the fixed mold and the movable mold The pressing force is arranged so as to be movable facing the mold and is weaker than the moving mold. Wherein together it is biased in a direction opposite to the fixed mold, and an intermediate type which is set to the same width and inner width of the small opening and held at the shoulder of the hook of metal strands, the mobile Te Forms the small opening having an arc portion with the intermediate mold while moving in the direction of the fixed mold, and then the movable mold overcomes the biasing force of the intermediate mold and becomes integrated with the intermediate mold It moves to the direction of the said fixed mold | type, The bending part of the said enlarged opening part is shape | molded by the said fixed mold | die, It is characterized by the above-mentioned.
[0009]
In the operation of the invention according to claim 1, in the endoscopic treatment instrument formed of a metal strand used for endoscopic treatment, the distal end portion of the endoscopic treatment instrument is formed by one metal twist. A small opening formed by extending in parallel by forming a circular arc with a U-turn having an angle of 180 degrees by a wire, and a bent portion in which the parallel metal strands of the small opening are bent outward, respectively. And a widened portion in which the metal stranded wires are aligned and bound in the direction of the metal stranded wire extending in parallel to the small opening, and a substantially triangular binding portion is formed in this portion, and the small opening A metal stranded wire sandwiching a metal stranded wire extended from an arc portion by a movable die having a groove set to the same groove width as the outer width of the metal and an intermediate die set to the same width as the inner width of the small opening after squeezing the inner, press during molding to release the pressing force of the mobile Inflated by the return portion of the stress of the wires due to ironing of the metal strands to said arcuate portion when the force is released accumulates, the diameter of the thickness dimension of the metal strands of the arc portion in the small opening The bundling portion, the widened portion, and the small opening are formed in the same plane, so that the stress of the stranded wire is released, and the shape of the arc portion and the bundled portion and the widened portion are formed. The same planar shape of the portion and the small opening is maintained.
According to the second aspect of the present invention, a small opening formed by extending the tip portion in parallel by forming a circular arc with a U-turn with an angle of 180 degrees by a single metal strand, and a parallel of the small opening in the processing apparatus of the endoscope treatment instrument having a拡口portion forming a unity moiety binding to align the metal strands as well as have a curved portion in which the metal strands were bent outward respectively is secured to the base Rutotomoni, center projection set in the inner width and the same width of the small opening, the inclined surface formed on both sides than the base of the central projection, both shoulder and fixed to both side portions are formed And a movable mold having a groove set to have the same groove width as the outer width of the small opening disposed so as to be able to advance and retreat and press freely facing the fixed mold, and between the fixed mold and the movable mold Opposed to the fixed mold and movably arranged, and weaker than the movable mold Together is biased in a direction opposite to the fixed mold at a pressure, and an intermediate type which is set to the same width and inner width of the small opening and held at the shoulder of the hook of metal strands, the The movable mold forms the small opening having an arc portion with the intermediate mold while moving in the direction of the fixed mold, and then the movable mold overcomes the biasing force of the intermediate mold and is integrated with the intermediate mold. After moving in the direction of the fixed mold and forming the bent portion of the enlarged mouth portion with the fixed mold, the shape of the small opening of the treatment instrument for endoscope is formed and held, and the like. The bent part of the widened part is formed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 12 show an embodiment of the invention, FIG. 1 is a front view of a distal end portion of an endoscope treatment instrument, FIG. 2 is a side view of the distal end portion of an endoscope treatment instrument, and FIG. 4 is a front view of the distal end portion of the material for the endoscope treatment tool, FIG. 4 is a state diagram in which the endoscope treatment tool is incorporated in the coil sheath, and FIG. 5 is a left side view of the processing device for the endoscope treatment tool. Is a front view of the endoscope treatment tool processing apparatus, FIG. 7 is a right side view of the endoscope treatment tool processing apparatus, FIG. 8 is a perspective view showing an intermediate hook portion of the processing apparatus, and FIG. The perspective view which shows the relationship between the movement type | mold of a processing apparatus, an intermediate | middle type | mold, and a fixed type | mold, FIG. 10 is a process figure of the treatment tool for endoscopes, FIG. 11 is a process condition figure of the small opening part of the treatment tool for endoscopes, FIG. 12 is a processing state diagram of the mouth-opening portion of the endoscope treatment tool.
[0011]
In the embodiment of the present invention, the distal end portion of the endoscope treatment tool is formed into the shape shown in FIGS. 1 and 2 from the material 5 shown in FIG. 3 by a processing apparatus and method described later. In this endoscope treatment tool, a distal end portion 4 made of a thin stranded wire 2 is formed on the distal end side of the operation wire 1. The tip 4 has a small opening 4a made of parallel stranded wire 2 formed in a circular arc at the tip and U-turned 180 degrees, and the parallel stranded wire 2 of the small opening 4a outward. Further, the twisted wire 2 is aligned in the direction of the parallel twisted wire 2 of the small opening 4a and bound by the connecting pipe 3, and this portion includes a substantially triangular opening 4b. ing. As shown in FIG. 2, the endoscope treatment instrument has a small opening 4a, a widening portion 4b, and a connecting pipe 3 that are in a straight line when viewed from the side. . In addition, the thickness t of the arcuate portion of the most advanced apex 2b is formed to be larger than the diameter d of the stranded wire 2 by bulging.
[0012]
Next, an endoscope treatment tool processing apparatus will be described. 5 to 7, the fixed mold 13 is fixed to the fixed base 14. The fixed base 14 is erected vertically from a horizontal base (not shown). The fixed mold 13 forms a central protrusion 13a, and this width is set to be the same as the inner width w (see FIG. 1) of the small opening 4a of the endoscope treatment tool. Inclined surfaces 13c are formed on both sides of the base portion 13b of the central protrusion 13a, and further, both shoulder portions 13d and both side portions 13e are formed. Opposite to the fixed mold 13, the movable mold 11 is disposed so as to be able to advance and retract and press freely. A cylinder 15 that drives the movable die 11 so as to be able to advance and retract and press freely is connected to the fixed base 14 via a fixture 16. A groove 11a is formed at the center tip of the movable die 11, and the groove width is set to be the same as the outer width w + 2d (see FIG. 1) of the small opening 4a of the endoscope treatment tool. Furthermore, inclined surfaces 11c parallel to the inclined surface 13c of the fixed mold 13 are formed on both sides from both shoulder portions 11b of the groove 11a.
[0013]
An intermediate mold 12 is disposed between the fixed mold 13 and the movable mold 11. The width of the intermediate mold 12 is set to be the same as the inner width w (see FIG. 1) of the small opening 4a of the endoscope treatment tool, similarly to the central protrusion 13a of the fixed mold 13. The intermediate mold 12 has its base portion sandwiched between two sliding plates 18 and is integrally fixed. The sliding plate 18 is slidably fitted to a guide 17 fixed to the fixed base 14, and is urged upward by a coil spring 19 mounted in the guide 17. The elastic force of the coil spring 19 is set to be weaker than the pressing force of the cylinder 15, and when the movable mold 11 comes into contact with the intermediate mold 12 and descends, the intermediate mold 12 is lowered integrally with the movable mold 11. To do. As shown in FIG. 8, the intermediate mold 12 is formed with a hook 12 a at the tip so that the stranded wire 2 of the material 5 can be hooked.
[0014]
As already described, the material 5 has the shape shown in FIG. 3, and is configured by connecting the operation wire 1 and the loop portion 4 </ b> A composed of the stranded wire 2 by the connection pipe 3. The loop portion 4A of the material 5 is hooked on the hook 12a of the intermediate mold 12, the weight 20 is attached to a predetermined position in the middle of the operation wire 1, and tension is applied to the stranded wire 2.
[0015]
Next, a method for manufacturing an endoscope treatment tool using the processing apparatus will be described. First, the loop portion 4A of the material 5 is folded in half, and a light bend is applied. As shown in FIG. 9, the twisted wire 2 of the two-folded portion is hung on the hook 12 a of the intermediate die 12, and both sides of the twisted wire 2 are hung on both shoulder portions 13 d of the fixed die 13. Further, as shown in FIGS. 5 and 6, the weight 20 is attached to the operation wire 1 and tension is applied to the stranded wire 2. This state is illustrated in the process diagram of FIG. As shown in FIG. 11, when the stranded wire 2 is hung on the hook 12 a, an arc R is formed at the center of the stranded wire 2.
[0016]
The movable mold 11 is lowered, and both the shoulder portions 11b of the groove 11a of the movable mold 11 come into contact with the stranded wire 2 hung on the hook 12a of the intermediate mold 12, and the stranded wire 2 is biased to the intermediate mold 12 Since both sides of the hook 12a are supported by the shoulders 11b of the movable mold 11 in a state in which the arc R is formed and in contact with both the shoulders 12b of the hook 12a. It is pressed against the surface 12c. This state is illustrated in the process diagram of FIG. 10B and FIG.
[0017]
When the movable die 11 is further lowered, the pressing force of the movable die 11 overcomes the elastic force of the intermediate die 12, and the hook 12a is also lowered. The arc R of the stranded wire 2 is lowered together with the hook 12a while being formed. Soon, the lower surface of the hook 12 a comes into contact with the upper surface of the central protrusion 13 a of the fixed mold 13. Both shoulder portions 11b of the movable die 11 are bent and deformed with the fixed die 13 while pulling the stranded wire 2 (that is, each strand constituting the stranded wire 2). Finally, as shown in FIG. 12, the inclined surface 11 c of the movable mold 11 is brought into contact with the inclined surface 13 c of the fixed mold 13 with the stranded wire 2 interposed therebetween, and the bent portion 2 a of the stranded wire 2 is pressed. At this time, the inner side of the stranded wire 2 is squeezed by the shoulders 12b of the hook 12a, and the arc R has a slightly smaller curvature (a larger radius of curvature). In this case, both the shoulder portions 13d and both side portions 13e of the fixed mold 13 shown in FIG. 5 are also formed by pressing the stranded wire 2 by pressing means (not shown). This state is illustrated in the process diagram of FIG.
[0018]
Next, when the movable die 11 is raised, the intermediate die 12 and the stranded wire 2 are also raised. Further, the pressing means that pressed both the shoulder portions 13d and both side portions 13e of the fixed mold 13 shown in FIG. 5 also returns. This state is illustrated in the process diagram of FIG. Further, when the movable die 11 is raised, the intermediate die 12 and the stranded wire 2 are stopped, and the stranded wire 2 is detached from the movable die 11. This state is illustrated in the process diagram of FIG.
[0019]
At this time, the pressing force of the bent portion 2a of the stranded wire 2 is released. When the pressing force is released, the stress of each strand constituting the stranded wire 2 is released, so that a force for returning to the direction of the arrow shown in FIG. 12 acts on each strand. In the state where the cross-sectional shape of the stranded wire 2 squeezed by the shoulders 12b of the hook 12a is substantially maintained, the return portion of each strand is collected at the portion where the arc R of the top portion 2b is formed. When 2b is viewed from the side, as shown in FIG. 2, the thickness t of the top portion 2b is slightly larger than the diameter d of the stranded wire 2. In this swollen state, the arc shape of the top portion 2b is maintained, and the parallel state of the parallel portion 2c following the arc R is maintained. Further, since the stress of the stranded wire 2 is released, the small opening 4a, the widened portion 4b, and the connection pipe 3 are formed in the same plane. As described above, as shown in FIGS. 1 and 2, an endoscope treatment tool having a desired shape can be obtained.
[0020]
According to the embodiment of the present invention, the arc shape is maintained by the bulge of the top portion, and the tip portion composed of the small opening portion and the widened portion and the connecting pipe are in the same plane shape, which is a desirable shape. An endoscopic treatment tool can be obtained. In addition, an intermediate mold is provided so that the small opening portion of the endoscope treatment tool is formed first, and then the widened portion is formed, so that the tip portion can be stably processed into a desired shape. It is possible to provide a processing device for an endoscope treatment tool that can perform the above-described processing.
[0021]
In the embodiment of the present invention, the processing device is configured vertically and tension is applied to the stranded wire by the gravity of the weight. However, the processing device may be configured horizontally, in which case the operation wire The weight is hung on the pulley, and the gravity works in the horizontal direction. Further, instead of the weight, tension may be applied by an air cylinder. Further, although the intermediate pressing force is urged by the coil spring, the pressing force may be urged by an air cylinder.
[0022]
【The invention's effect】
According to the first aspect of the present invention, when the pressing force at the time of forming is released, the arc portion expands by the return of the stress due to the ironing of each element wire, and the thickness of the arc portion in the small opening portion The dimension is formed larger than the diameter of the metal strand wire, and the shape of the arc portion and the coplanar shape of the bundling portion, the widened portion and the small opening are maintained, so that the tip portion can be kept in a desired shape, An operation at the time of excision of a polyp or the like can be easily performed.
According to the invention of claim 2, the movable mold forms the small opening with the intermediate mold while moving in the direction of the fixed mold, and then the movable mold overcomes the urging force of the intermediate mold and the intermediate mold. Since the bent portion of the enlarged mouth portion is formed by the fixed die and integrally moved in the direction of the fixed die, the distal end portion of the endoscope treatment instrument can be stably processed into a desired shape.
[Brief description of the drawings]
FIG. 1 is a front view of a distal end portion of an endoscope treatment tool according to an embodiment of the invention.
FIG. 2 is a side view of the distal end portion of the endoscope treatment tool according to the embodiment of the invention.
FIG. 3 is a front view of the distal end portion of the material of the endoscope treatment tool according to the embodiment of the invention.
FIG. 4 is a state diagram in which the endoscope treatment tool according to the embodiment of the present invention is incorporated in a coil sheath.
FIG. 5 is a left side view of the processing apparatus for the endoscope treatment tool according to the embodiment of the present invention.
FIG. 6 is a front view of the processing apparatus for the endoscope treatment tool according to the embodiment of the present invention.
FIG. 7 is a right side view of the processing device for the endoscope treatment tool according to the embodiment of the present invention.
FIG. 8 is a perspective view showing an intermediate hook portion of the processing apparatus according to the embodiment of the invention.
FIG. 9 is a perspective view showing a relationship among a moving type, an intermediate type, and a fixed type of the processing apparatus according to the embodiment of the invention.
FIG. 10 is a process diagram of the endoscope treatment tool according to the embodiment of the present invention.
FIG. 11 is a processing state diagram of a small opening of the endoscope treatment tool according to the embodiment of the invention.
FIG. 12 is a processing state diagram of the mouth-opening portion of the endoscope treatment tool according to the embodiment of the invention.
FIG. 13 is a plan view of a conventional processing apparatus for an endoscope treatment tool.
FIG. 14 is a plan view of a processing apparatus for an endoscope treatment tool according to the prior art.
FIG. 15 is a side view of a processing apparatus showing a defect of the prior art.
FIG. 16 is a side view of a processing apparatus showing a defect of the prior art.
FIG. 17 is a view on arrow X in FIG. 13 showing a problem of the prior art.
18 is an enlarged view of a Y part in FIG. 13 of the prior art.
FIG. 19 is a view showing a state where a treatment tool having a desired shape according to the prior art is hung.
FIG. 20 is a view showing a state in which a treatment tool having an undesired shape according to the prior art is hung.
FIG. 21 is a diagram showing a defect of a small opening portion of a conventional endoscope treatment tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Operation wire 2 Stranded wire 2b Top part 3 Connection pipe 4 Tip part 4a Small opening part 4b Widening part

Claims

In an endoscope treatment tool formed of a metal strand used for endoscopic treatment, the distal end portion of the endoscope treatment tool is arced with a U-turn having an angle of 180 degrees by a single metal strand. A small opening formed by extending in parallel with
And has a curved portion which is parallel the metal strands were bent outward each of the small opening portion, bundling the aligned the metal strands in a direction parallel extended metal strands of the micro-apertures And a widened portion formed with a substantially triangular binding portion in this portion,
A metal stranded wire extended from an arc portion is sandwiched between a movable mold having a groove set to the same groove width as the outer width of the small opening and an intermediate mold set to the same width as the inner width of the small opening. After squeezing the inside of the metal stranded wire with, the amount of return of the stress of each strand due to the squeezing of the metal stranded wire on the arc part when the pressing force is released during the molding process to release the moving type pressing force The thickness of the arc portion in the small opening is formed larger than the diameter of the metal stranded wire, and the bundling portion, the widened portion, and the small opening are coplanar. An endoscopic treatment tool characterized by comprising:

A small opening formed by extending the tip portion in parallel by forming a circular arc with a U-turn at an angle of 180 degrees with a single metal strand, and the metal strand parallel to the small opening are directed outward. in the processing apparatus of the endoscope treatment instrument having a拡口portion forming a unity moiety binding to align the metal strands as well as have a bent portion which is bent Te,
Rutotomoni secured to the base, the center projection set in the inner width and the same width of the small opening, the inclined surface formed on both sides than the base of the center projection, and both shoulder and fixed to both side portions are formed ,
A movable mold having a groove set to have the same groove width as the outer width of the small opening disposed so as to be able to advance and retreat and press freely facing the fixed mold;
Between the fixed mold and the movable mold is arranged to be movable so as to face the fixed mold, and is urged in a direction facing the fixed mold with a weaker pressing force than the movable mold , An intermediate mold that holds a metal strand at the shoulder of the hook and is set to the same width as the inner width of the small opening ,
With
The movable mold forms the small opening having an arc portion with the intermediate mold while moving in the direction of the fixed mold, and then the movable mold overcomes the urging force of the intermediate mold and is integrated with the intermediate mold. It moves to the direction of the said fixed mold | type, and forms the bending part of the said enlarged opening part with the said fixed mold | type, The processing apparatus of the treatment tool for endoscopes characterized by the above-mentioned.