JP6988287B2 - Knife for high frequency treatment tool and high frequency treatment tool for medical use - Google Patents

Knife for high frequency treatment tool and high frequency treatment tool for medical use Download PDF

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JP6988287B2
JP6988287B2 JP2017174238A JP2017174238A JP6988287B2 JP 6988287 B2 JP6988287 B2 JP 6988287B2 JP 2017174238 A JP2017174238 A JP 2017174238A JP 2017174238 A JP2017174238 A JP 2017174238A JP 6988287 B2 JP6988287 B2 JP 6988287B2
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frequency treatment
pair
treatment tool
knife
tip
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JP2019047958A (en
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幸彦 坂口
昌夫 池田
靖久 石井
新悦 原田
康人 伊丹
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Sumitomo Bakelite Co Ltd
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Sumitomo Bakelite Co Ltd
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Application filed by Sumitomo Bakelite Co Ltd filed Critical Sumitomo Bakelite Co Ltd
Priority to RU2020113240A priority patent/RU2792081C2/en
Priority to KR1020207006526A priority patent/KR102635005B1/en
Priority to CA3075603A priority patent/CA3075603A1/en
Priority to EP18852893.9A priority patent/EP3682833A4/en
Priority to CN201880057631.3A priority patent/CN111093546A/en
Priority to PCT/JP2018/033372 priority patent/WO2019050025A1/en
Priority to BR112020004431-8A priority patent/BR112020004431A2/en
Priority to US16/645,668 priority patent/US20200367960A1/en
Priority to TW107131841A priority patent/TW201929785A/en
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本発明は、高周波処置具用ナイフ、及び、医療用の高周波処置具に関する。 The present invention relates to a knife for a high frequency treatment tool and a medical high frequency treatment tool.

体腔内で生体組織を切開する処置（病変部位を切除する処置を含む）を行うための医療用器具として、内視鏡の鉗子孔に挿入して用いられる高周波処置具が知られている。 As a medical instrument for performing a procedure for incising a living tissue in a body cavity (including a procedure for excising a lesion site), a high-frequency treatment tool used by inserting it into a forceps hole of an endoscope is known.

例えば、特許文献１には、開閉可能な一対の剪断鋏部を先端部に備える高周波処置具について記載されている。 For example, Patent Document 1 describes a high-frequency treatment tool having a pair of shearing shears that can be opened and closed at the tip.

国際公開第２０１１−０４３３４０号パンフレットInternational Publication No. 2011-0433340 Pamphlet

しかしながら、本願発明者の検討によれば、特許文献１の技術では、一対の剪断鋏部により生体組織を把持する際の確実性が必ずしも十分ではない。 However, according to the study of the inventor of the present application, the technique of Patent Document 1 does not always have sufficient certainty when gripping a living tissue by a pair of shear shears.

本発明は、上記の課題に鑑みてなされたものであり、生体組織をより確実に把持することが可能な構造の高周波処置具用ナイフを提供するものである。 The present invention has been made in view of the above problems, and provides a knife for a high-frequency treatment tool having a structure capable of more reliably grasping a living tissue.

本発明は、医療用の高周波処置具の先端部に設けられ、内視鏡の鉗子孔に挿入して用いられて生体組織を切開する高周波処置具用ナイフであって、
共通の回転軸において軸支されて相互に開閉可能となっており、前記生体組織を剪断する刃部をそれぞれ有する一対の剪断鋏部を備え、
前記一対の剪断鋏部の各々は、
当該剪断鋏部の基端側に形成されていて前記回転軸において軸支されている基端片と、
当該剪断鋏部の先端に形成されている先端爪部と、
当該剪断鋏部における前記先端爪部と前記基端片との間に形成されている刃部と、
を有し、
前記刃部には電極が形成されており、
前記回転軸の軸中心と前記刃部の底とを結ぶ仮想直線を基準とする高さが、前記先端爪部の高さよりも、前記刃部における前記電極の形成領域のうち最も高い位置の高さの方が低い高周波処置具用ナイフを提供するものである。 The present invention is a knife for a high-frequency treatment tool provided at the tip of a high-frequency treatment tool for medical use and used by inserting it into a forceps hole of an endoscope to incise a living tissue.
It is axially supported on a common axis of rotation and can be opened and closed mutually, and is equipped with a pair of shearing shears each having a blade for shearing the biological tissue.
Each of the pair of shear shears
A base end piece formed on the base end side of the shear shear portion and supported by the rotation axis, and a base end piece.
The tip claw part formed at the tip of the shear shear part and
A blade portion formed between the tip claw portion and the base end piece in the shear shear portion, and a blade portion.
Have,
Electrodes are formed on the blade portion, and
The height with respect to the virtual straight line connecting the axis center of the rotating shaft and the bottom of the blade portion is higher than the height of the tip claw portion at the highest position of the electrode forming region in the blade portion. It provides a lower high frequency treatment tool knife.

また、本発明は、本発明の高周波処置具用ナイフを先端部に有し、基端側には、前記一対の剪断鋏部の開閉操作を行うための操作部を有する医療用の高周波処置具を提供するものである。 Further, the present invention has a knife for a high-frequency treatment tool of the present invention at a tip portion, and a medical high-frequency treatment tool having an operation portion for opening and closing the pair of shear scissors portions on the proximal end side. Is to provide.

本発明によれば、生体組織をより確実に把持することが可能となる。 According to the present invention, it is possible to grip a living tissue more reliably.

第１実施形態に係る医療用の高周波処置具の全体構造を示す模式図である。It is a schematic diagram which shows the whole structure of the high frequency treatment tool for medical use which concerns on 1st Embodiment. 第１実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの側面図であり、一対の剪断鋏部が閉じた状態を示す。It is a side view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 1st Embodiment has in the tip part, and shows the state which a pair of shearing scissors parts are closed. 第１実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの側面図であり、一対の剪断鋏部が開いた状態を示す。It is a side view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 1st Embodiment has in the tip part, and shows the state which a pair of shearing scissors parts are open. 第１実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの平面図であり、一対の剪断鋏部が閉じた状態を示す。It is a top view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 1st Embodiment has in the tip part, and shows the state which a pair of shearing shears parts are closed. 図５（ａ）は第１実施形態に係る高周波処置具用ナイフの剪断鋏部の内側面を示す側面図であり、図５（ｂ）は第１実施形態に係る高周波処置具用ナイフの剪断鋏部の外側面を示す側面図である。FIG. 5A is a side view showing the inner surface of the shearing scissors portion of the knife for high frequency treatment tool according to the first embodiment, and FIG. 5B is a shearing of the knife for high frequency treatment tool according to the first embodiment. It is a side view which shows the outer surface of a shear part. 図６（ａ）は第１実施形態に係る高周波処置具用ナイフの先端鋏部の斜視図であり、図６（ｂ）は図５（ｂ）のＡ−Ａ線に沿った先端鋏部の切断端面図である。FIG. 6A is a perspective view of the tip scissors portion of the knife for high frequency treatment tool according to the first embodiment, and FIG. 6B is a perspective view of the tip scissors portion along the line AA of FIG. 5B. It is a cut end view. 第１実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフが内視鏡の先端に設けられたフードから突出した状態を示す側面図である。It is a side view which shows the state which the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 1st Embodiment has provided in the tip part protrudes from the hood provided in the tip of an endoscope. 第２実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの側面図であり、一対の剪断鋏部が閉じた状態を示す。It is a side view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 2nd Embodiment has in the tip part, and shows the state which a pair of shearing scissors parts are closed. 第２実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの側面図であり、一対の剪断鋏部が開いた状態を示す。It is a side view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 2nd Embodiment has in the tip part, and shows the state which a pair of shearing scissors parts are open. 第３実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの側面図であり、一対の剪断鋏部が開いた状態を示す。It is a side view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 3rd Embodiment has in the tip part, and shows the state which a pair of shearing scissors parts are open. 第３実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの側面図であり、一対の剪断鋏部が閉じられて、一対の剪断鋏部の先端爪部どうしが重なり始めるとともに、一対の剪断鋏部の互いに対応する中間高段部どうしが接触した状態を示す。It is a side view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 3rd Embodiment has in the tip part, the pair of shearing scissors part is closed, and the tip claw part of a pair of shearing scissors part overlaps with each other. As soon as it starts, it shows a state in which the pair of shear shears are in contact with each other in the corresponding middle high steps. 第３実施形態に係る医療用の高周波処置具が先端部に備える高周波処置具用ナイフの側面図であり、一対の剪断鋏部が閉じた状態を示す。It is a side view of the knife for the high frequency treatment tool which the medical high frequency treatment tool which concerns on 3rd Embodiment has in the tip part, and shows the state which a pair of shearing scissors parts are closed.

以下、本発明の実施形態について、図面を用いて説明する。なお、すべての図面において、同様の構成要素には同一の符号を付し、適宜に説明を省略する。
本実施形態に係る医療用の高周波処置具の各種の構成要素は、個々に独立した存在である必要はなく、複数の構成要素が一個の部材として形成されていること、一つの構成要素が複数の部材で形成されていること、ある構成要素が他の構成要素の一部であること、ある構成要素の一部と他の構成要素の一部とが重複していること、等を許容する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
The various components of the medical high-frequency treatment tool according to the present embodiment do not have to be individually independent, and a plurality of components are formed as one member, and one component is a plurality. It is allowed that it is formed of the members of the above, that one component is a part of another component, that a part of one component overlaps with a part of another component, and the like. ..

〔第１実施形態〕
先ず、図１から図７を用いて第１実施形態を説明する。
図２及び図３に示す側面図では、シース７０において図示した範囲のうち、基端側の部分については、中心線に沿った側断面を示している。
図６（ａ）においては、刃部５０における電極５２の形成領域（電極形成領域５３（図５（ａ）、図５（ｂ）））にドット状のハッチングを付している。
電極５２は、先端爪部４０の後述する基端側縁辺４１、低段部５５、及び、高段部５４の基端部に位置する電極基端位置５３ａに亘って、連続的に形成されている。 [First Embodiment]
First, the first embodiment will be described with reference to FIGS. 1 to 7.
In the side views shown in FIGS. 2 and 3, in the range shown in the sheath 70, the portion on the proximal end side shows a side cross section along the center line.
In FIG. 6A, dot-shaped hatching is provided in the electrode forming region 53 (electrode forming region 53 (FIGS. 5A and 5B)) of the electrode 52 in the blade portion 50.
The electrode 52 is continuously formed over the base end side edge 41, the low step portion 55, and the electrode base end position 53a located at the base end portion of the high step portion 54 of the tip claw portion 40, which will be described later. There is.

本実施形態に係る高周波処置具用ナイフ１００は、医療用の高周波処置具２００（以下、単に高周波処置具２００と称する場合がある）の先端部に設けられ、内視鏡３００（図７には内視鏡３００の先端部のフード３１０における先端側の部分を示している）の鉗子孔（不図示）に挿入して用いられて生体組織を切開する高周波処置具用ナイフ１００である。
高周波処置具用ナイフ１００は、共通の回転軸（図２、図３に示す軸部材６１）において軸支されて相互に開閉可能となっており、生体組織を剪断する刃部５０をそれぞれ有する一対の剪断鋏部１０を備えている。
図５（ａ）、図５（ｂ）及び図６（ａ）に示すように、一対の剪断鋏部１０の各々は、当該剪断鋏部１０の基端側に形成されていて上記回転軸において軸支されている基端片２０と、当該剪断鋏部１０の先端に形成されている先端爪部４０と、当該剪断鋏部１０における先端爪部４０と基端片２０との間に形成されている刃部５０と、を有する。
刃部５０には電極５２が形成されており、上記回転軸の軸中心２１ａと刃部５０の底５１とを結ぶ仮想直線Ｌ１を基準とする高さが、先端爪部４０の高さよりも、刃部５０における電極５２の形成領域（電極形成領域５３）のうち最も高い位置の高さの方が低い。 The high-frequency treatment tool knife 100 according to the present embodiment is provided at the tip of a high-frequency treatment tool 200 for medical use (hereinafter, may be simply referred to as a high-frequency treatment tool 200), and is provided with an endoscope 300 (FIG. 7 shows. It is a knife 100 for a high frequency treatment tool that is used by inserting it into a forceps hole (not shown) of the tip end portion of the endoscope 300 (showing the tip end side portion of the hood 310) to incise a living tissue.
The high-frequency treatment tool knife 100 is pivotally supported by a common rotation shaft (shaft member 61 shown in FIGS. 2 and 3) and can be opened and closed with each other, and each pair has a blade portion 50 for shearing a living tissue. The shearing shears portion 10 is provided.
As shown in FIGS. 5 (a), 5 (b) and 6 (a), each of the pair of shear scissors 10 is formed on the proximal end side of the shear scissors 10 and is formed on the rotation axis. It is formed between the axially supported base end piece 20, the tip claw portion 40 formed at the tip of the shear scissors portion 10, and the tip claw portion 40 and the base end piece 20 in the shear scissors portion 10. It has a blade portion 50 and a shearing force 50.
An electrode 52 is formed on the blade portion 50, and the height with respect to the virtual straight line L1 connecting the axis center 21a of the rotation axis and the bottom 51 of the blade portion 50 is higher than the height of the tip claw portion 40. The height of the highest position in the formed region of the electrode 52 (electrode forming region 53) in the blade portion 50 is lower.

図５（ａ）には、仮想直線Ｌ１に対してそれぞれ平行な直線Ｌ２及び直線Ｌ３が示されている。このうち直線Ｌ２は、刃部５０における電極５２の形成領域（電極形成領域５３）のうち最も高い位置を通る直線である。また、直線Ｌ３は、先端爪部４０において最も高い位置を通る直線である。
仮想直線Ｌ１を基準とする高さが、先端爪部４０の高さよりも、刃部５０における電極５２の形成領域のうち最も高い位置の高さの方が低いということは、換言すれば、仮想直線Ｌ１と直線Ｌ３との距離よりも、仮想直線Ｌ１と直線Ｌ２との距離の方が短いということである。 FIG. 5A shows a straight line L2 and a straight line L3 parallel to the virtual straight line L1, respectively. Of these, the straight line L2 is a straight line that passes through the highest position of the electrode 52 forming region (electrode forming region 53) in the blade portion 50. Further, the straight line L3 is a straight line passing through the highest position in the tip claw portion 40.
In other words, the height with respect to the virtual straight line L1 is lower at the height of the highest position in the formed region of the electrode 52 in the blade portion 50 than at the height of the tip claw portion 40. This means that the distance between the virtual straight line L1 and the straight line L2 is shorter than the distance between the straight line L1 and the straight line L3.

また、本実施形態に係る医療用の高周波処置具２００は、本実施形態に係る高周波処置具用ナイフ１００を先端部に有し、基端側には、一対の剪断鋏部１０の開閉操作を行うための手元操作部（操作部）９０を有する。 Further, the medical high-frequency treatment tool 200 according to the present embodiment has a knife 100 for the high-frequency treatment tool according to the present embodiment at the tip end, and a pair of shear scissors 10 is opened and closed on the proximal end side. It has a hand operation unit (operation unit) 90 for performing the operation.

本実施形態によれば、仮想直線Ｌ１を基準とする高さが、先端爪部４０の高さよりも、刃部５０における電極５２の形成領域（電極形成領域５３）のうち最も高い位置の高さの方が低いことにより、一対の剪断鋏部１０を閉じる際に刃部５０によって生体組織を押し戻す動作が抑制される。このため、一対の剪断鋏部１０を閉じる際に先端爪部４０を速やかに生体組織に食い込ませることができ、一対の剪断鋏部１０によって生体組織をより確実に把持することが可能である。 According to the present embodiment, the height with respect to the virtual straight line L1 is the height of the highest position in the electrode 52 forming region (electrode forming region 53) in the blade portion 50 than the height of the tip claw portion 40. When the pair of shearing shears 10 is closed, the blade 50 suppresses the action of pushing back the living tissue. Therefore, when closing the pair of shearing shears 10, the tip claw portion 40 can be quickly bitten into the living tissue, and the pair of shearing shears 10 can grip the living tissue more reliably.

図１に示すように、高周波処置具２００は、長尺な操作ワイヤ６８と、操作ワイヤ６８の先端に設けられた高周波処置具用ナイフ１００と、操作ワイヤ６８が収容された可撓性のシース７０と、シース７０の基端側に設けられて操作ワイヤ６８の基端が接続された手元操作部９０と、を備えている。 As shown in FIG. 1, the high-frequency treatment tool 200 includes a long operation wire 68, a knife 100 for the high-frequency treatment tool provided at the tip of the operation wire 68, and a flexible sheath containing the operation wire 68. It includes a 70 and a hand operation unit 90 provided on the base end side of the sheath 70 and to which the base end of the operation wire 68 is connected.

シース７０は、操作ワイヤ６８を収容する長尺かつ管状の部材である。本実施形態の場合、シース７０は、ステンレス線等の導電性ワイヤを密着巻回して作製された、金属製のコイル７１（図２、図３）である。シース７０の外表面には絶縁性被膜７２が密着して設けられている。ただしシース７０としては、金属製のコイル７１に代えて絶縁性の管状部材（チューブ）を用いてもよい。 The sheath 70 is a long and tubular member that houses the operation wire 68. In the case of the present embodiment, the sheath 70 is a metal coil 71 (FIGS. 2 and 3) manufactured by tightly winding a conductive wire such as a stainless wire. An insulating coating 72 is provided in close contact with the outer surface of the sheath 70. However, as the sheath 70, an insulating tubular member (tube) may be used instead of the metal coil 71.

図１に示す手元操作部９０は、操作ワイヤ６８が挿通された軸部９５と、この軸部９５の基端部に設けられた指掛リング９２と、操作ワイヤ６８の基端が連結されて軸部９５に対して進退移動するスライダ９３と、を備えている。操作ワイヤ６８は軸部９５に対して摺動可能に挿通されている。ユーザは、指掛リング９２に例えば親指を挿入し、スライダ９３を他の２本の指で挟んで軸部９５の長手方向に沿って進退駆動する。これにより、操作ワイヤ６８は手元操作部９０に対して前進または後退する。シース７０の基端は手元操作部９０に固定され、操作ワイヤ６８はシース７０に対して進退可能に挿通されているため、スライダ９３の進退移動に連動して操作ワイヤ６８の先端はシース７０に対して前進または後退する。これにより、後述するように、高周波処置具用ナイフ１００の進退部６７（図２、図３）が進退駆動されて、一対の剪断鋏部１０が開閉する。
一対の剪断鋏部１０の回転軸の軸方向は、剪断鋏部１０の板面に対して直交する方向であり、一対の剪断鋏部１０が開閉する際には、図５（ｂ）に示す内側面どうしが摺動する。 In the hand operation unit 90 shown in FIG. 1, the shaft portion 95 through which the operation wire 68 is inserted, the finger hook ring 92 provided at the base end portion of the shaft portion 95, and the base end of the operation wire 68 are connected to each other. A slider 93 that moves forward and backward with respect to the shaft portion 95 is provided. The operation wire 68 is slidably inserted through the shaft portion 95. The user inserts, for example, a thumb into the finger hook ring 92, sandwiches the slider 93 with two other fingers, and drives the slider 93 forward and backward along the longitudinal direction of the shaft portion 95. As a result, the operation wire 68 moves forward or backward with respect to the hand operation unit 90. Since the base end of the sheath 70 is fixed to the hand operation unit 90 and the operation wire 68 is inserted into the sheath 70 so as to be able to advance and retreat, the tip of the operation wire 68 is inserted into the sheath 70 in conjunction with the advance and retreat movement of the slider 93. On the other hand, move forward or backward. As a result, as will be described later, the advancing / retreating portion 67 (FIGS. 2 and 3) of the high-frequency treatment tool knife 100 is driven to advance / retreat, and the pair of shear shears 10 opens and closes.
The axial direction of the rotation axis of the pair of shearing shears 10 is a direction orthogonal to the plate surface of the shearing shears 10, and is shown in FIG. 5B when the pair of shearing shears 10 opens and closes. The inner surfaces slide against each other.

図１に示すように、手元操作部９０は給電部９１を備えている。給電部９１は一対の剪断鋏部１０に高周波電流を印加するための端子であり、電源ケーブルを介して高周波電源（不図示）が接続される。高周波処置具用ナイフ１００を構成する一対の剪断鋏部１０、リンク片６５、６６および進退部６７は、いずれも導電性の金属材料で作製されている。また、操作ワイヤ６８も導電性の金属材料で作製されている。このため、給電部９１に入力された高周波電流は一対の剪断鋏部１０に印加される。 As shown in FIG. 1, the hand operation unit 90 includes a power supply unit 91. The power feeding unit 91 is a terminal for applying a high frequency current to the pair of shearing shears 10, and a high frequency power supply (not shown) is connected via a power cable. The pair of shear shears 10, the link pieces 65, 66 and the advancing / retreating portion 67 constituting the knife 100 for a high-frequency treatment tool are all made of a conductive metal material. The operating wire 68 is also made of a conductive metal material. Therefore, the high frequency current input to the feeding unit 91 is applied to the pair of shear shears 10.

図２及び図３に示すように、高周波処置具用ナイフ１００は、板状の一対の剪断鋏部１０と、これら剪断鋏部１０を開閉可能に軸支している軸部材６１と、２枚のリンク片６５、６６と、進退部６７と、保持枠８０と、を備えている。
軸部材６１の軸方向は、図２及び図３の紙面に対して直交する方向である。また、軸部材６１の軸方向は、一対の剪断鋏部１０どうしの重なり方向であり、言い換えると一対の剪断鋏部１０の厚み方向である。
一対の剪断鋏部１０は、操作ワイヤ６８の押し引きにより開閉駆動される。操作ワイヤ６８は、ステンレス鋼などの導電性の金属材料で作製されている。 As shown in FIGS. 2 and 3, the high-frequency treatment tool knife 100 includes a pair of plate-shaped shear shears 10, a shaft member 61 that pivotally supports the shear shears 10 so as to be openable and closable, and two pieces. The link pieces 65 and 66, the advancing / retreating portion 67, and the holding frame 80 are provided.
The axial direction of the shaft member 61 is a direction orthogonal to the paper surface of FIGS. 2 and 3. Further, the axial direction of the shaft member 61 is the overlapping direction of the pair of shearing shears 10, in other words, the thickness direction of the pair of shearing shears 10.
The pair of shear shears 10 are driven to open and close by pushing and pulling the operation wire 68. The operating wire 68 is made of a conductive metal material such as stainless steel.

進退部６７は操作ワイヤ６８の先端に一体に連結されている。進退部６７には軸部材６４により２枚のリンク片６５、６６が回動可能に連結されている。さらに、リンク片６５には軸部材６３により一方の剪断鋏部１０（以下、剪断鋏部１０ａ）の基端片２０が回動可能に連結され、リンク片６６には軸部材６２により他方の剪断鋏部１０（以下、剪断鋏部１０ｂ）の基端片２０が回動可能に連結されている。
各軸部材６２、６３、６４の軸方向は、軸部材６１の軸方向に対して平行な方向である。
一対の剪断鋏部１０およびリンク片６５、６６は、図２及び図３に示す平面内（軸部材６１の軸方向に対して直交する平面内）で相対的に回動する。
一対の剪断鋏部１０の基端片２０と、リンク片６５、６６とにより菱形の四節リンクが構成されている。
なお、軸部材６２、６３は、軸部材６４よりも先端側に位置しており、軸部材６１は、軸部材６２、６３よりも先端側に位置している。 The advancing / retreating portion 67 is integrally connected to the tip of the operation wire 68. Two link pieces 65 and 66 are rotatably connected to the advancing / retreating portion 67 by a shaft member 64. Further, the base end piece 20 of one shearing shears portion 10 (hereinafter referred to as shearing shears portions 10a) is rotatably connected to the link piece 65 by the shaft member 63, and the other shearing portion 66 is rotatably connected to the link piece 66 by the shaft member 62. The base end piece 20 of the scissors portion 10 (hereinafter, shearing scissors portion 10b) is rotatably connected.
The axial direction of each of the shaft members 62, 63, 64 is a direction parallel to the axial direction of the shaft member 61.
The pair of shear shears 10 and the link pieces 65 and 66 rotate relatively in the plane shown in FIGS. 2 and 3 (in the plane orthogonal to the axial direction of the shaft member 61).
The base end piece 20 of the pair of shear shears 10 and the link pieces 65 and 66 form a rhombic four-node link.
The shaft members 62 and 63 are located closer to the tip side than the shaft member 64, and the shaft member 61 is located closer to the tip side than the shaft members 62 and 63.

保持枠８０はシース７０の先端に固定されている。
保持枠８０は、シース７０の先端に固定されている基端部８１と、基端部８１から先端側に突出している一対のブラケット８２と、を備えている。
ブラケット８２は、例えば板状に形成されている。
一対の剪断鋏部１０は、一対のブラケット８２の先端部に対して、軸部材６１により軸支されている。
一対のブラケット８２どうしの間隙において、一対の剪断鋏部１０の基端片２０と、リンク片６５、６６がそれぞれ回転可能となっているとともに、進退部６７においてシース７０から先端側に突出している部分が進退可能となっている。 The holding frame 80 is fixed to the tip of the sheath 70.
The holding frame 80 includes a base end portion 81 fixed to the tip end of the sheath 70, and a pair of brackets 82 protruding toward the tip end side from the base end portion 81.
The bracket 82 is formed in a plate shape, for example.
The pair of shear shears 10 is pivotally supported by a shaft member 61 with respect to the tip portions of the pair of brackets 82.
In the gap between the pair of brackets 82, the base end piece 20 of the pair of shear shears 10 and the link pieces 65 and 66 are rotatable, respectively, and the advancing / retreating portion 67 projects toward the tip side from the sheath 70. The part can be advanced and retreated.

図２に示すように、操作ワイヤ６８および進退部６７が基端側（図２における右方）に牽引されると、一対の剪断鋏部１０が閉状態となる。逆に、図３に示すように、操作ワイヤ６８および進退部６７が先端側（図３における左方）に押し出されると、一対の剪断鋏部１０が開状態となる。 As shown in FIG. 2, when the operation wire 68 and the advancing / retreating portion 67 are pulled toward the proximal end side (to the right in FIG. 2), the pair of shear shears 10 are closed. On the contrary, as shown in FIG. 3, when the operation wire 68 and the advancing / retreating portion 67 are pushed out to the tip end side (left side in FIG. 3), the pair of shear scissors portions 10 are opened.

一対の剪断鋏部１０の各々は、軸部材６１の近傍において回動面内で浅く屈曲する略Ｌ字状（すなわち鎌形状）をなしている。基端片２０は、一対の剪断鋏部１０の各々において、軸部材６１よりも基端側の部分である。一方、一対の剪断鋏部１０の各々において、軸部材６１よりも先端側の部分を、先端片３０と称する。 Each of the pair of shear shears 10 has a substantially L-shape (that is, a sickle shape) that bends shallowly in the rotating surface in the vicinity of the shaft member 61. The base end piece 20 is a portion of each of the pair of shear shears 10 on the base end side of the shaft member 61. On the other hand, in each of the pair of shear shears 10, the portion on the tip side of the shaft member 61 is referred to as a tip piece 30.

一対の剪断鋏部１０の形状は、互いに同一であってもよいし、互いに異なっていてもよい。本実施形態の場合、一対の剪断鋏部１０は互いに同一形状である。
以下、図５（ａ）、（ｂ）及び図６（ａ）を用いて、剪断鋏部１０の形状の詳細を説明する。 The shapes of the pair of shear shears 10 may be the same as each other or may be different from each other. In the case of this embodiment, the pair of shear shears 10 have the same shape.
Hereinafter, the details of the shape of the shear scissors portion 10 will be described with reference to FIGS. 5 (a), 5 (b) and 6 (a).

剪断鋏部１０の先端片３０の先端には、先端爪部４０が形成されている。先端爪部４０は、閉じ方向に突出している。閉じ方向とは一方の剪断鋏部１０から他方の剪断鋏部１０に向かう方向であり、その反対方向を開き方向と呼称する。
先端爪部４０は、生体組織に食い込む突起である。
先端片３０において先端爪部４０よりも基端側の部分における閉じ方向側の端縁（エッジ）に沿って、刃部５０が形成されている。
一対の剪断鋏部１０の先端爪部４０により生体組織を抱えるように保持して生体組織の脱落を防止した状態で、一対の剪断鋏部１０の刃部５０により生体組織を切開することができるようになっている。 A tip claw portion 40 is formed at the tip of the tip piece 30 of the shear scissors portion 10. The tip claw portion 40 projects in the closing direction. The closing direction is the direction from one shearing shears 10 toward the other shearing shears 10, and the opposite direction is referred to as an opening direction.
The tip claw portion 40 is a protrusion that bites into a living tissue.
In the tip piece 30, the blade portion 50 is formed along the edge on the closing direction side in the portion on the base end side of the tip claw portion 40.
The living tissue can be incised by the blades 50 of the pair of shearing shears 10 in a state where the tip claws 40 of the pair of shearing shears 10 hold the living tissue so as to hold it and prevent the living tissue from falling off. It has become like.

一対の剪断鋏部１０の各々の表面には絶縁性被膜１２（図５（ａ）、図５（ｂ））が形成されている。絶縁性被膜１２は、少なくとも、先端片３０の表面のうち、電極５２の形成領域を除く全体に形成されている。
絶縁性被膜１２は、たとえばフッ素樹脂などの絶縁性材料を剪断鋏部１０の表面にコーティングして形成することができる。
電極５２は、刃部５０において絶縁性被膜１２から露出した線状の部分である。一対の剪断鋏部１０は、給電部９１から同位相の高周波電圧が印加されてモノポーラ型の高周波電極となる。一対の剪断鋏部１０で生体組織を把持した状態で高周波電流を一対の剪断鋏部１０に印加することにより、生体組織は焼灼されて切開される。なお、本実施形態に代えて、一対の剪断鋏部１０の一方をアクティブ電極とし、他方をリターン電極とするバイポーラ型の高周波処置具２００としてもよい。 An insulating coating 12 (FIGS. 5A and 5B) is formed on the surface of each of the pair of shear shears 10. The insulating coating 12 is formed on at least the entire surface of the tip piece 30 except for the region where the electrode 52 is formed.
The insulating coating 12 can be formed by coating the surface of the shear shears portion 10 with an insulating material such as fluororesin.
The electrode 52 is a linear portion of the blade portion 50 exposed from the insulating coating 12. A high-frequency voltage having the same phase is applied to the pair of shear shears 10 from the feeding portion 91 to form a monopolar high-frequency electrode. By applying a high-frequency current to the pair of shearing shears 10 while holding the living tissue with the pair of shearing shears 10, the living tissue is cauterized and incised. Instead of the present embodiment, a bipolar type high frequency treatment tool 200 may be used in which one of the pair of shear shears 10 is used as an active electrode and the other is used as a return electrode.

本実施形態の場合、刃部５０には、高段部５４と、高段部５４よりも背３１側に向けて窪んだ切欠形状の低段部５５と、が形成されている。換言すれば、刃部５０には、仮想直線Ｌ１を基準とする高さが相対的に高い高段部５４と、当該高さが相対的に低い低段部５５とが形成されている。
電極５２は、高段部５４から低段部５５に亘って形成されている。電極５２は、図５（ａ）及び図５（ｂ）に示す電極形成領域５３に形成されている。電極形成領域５３は、図６（ａ）においてハッチングが付されている領域である。
本実施形態の場合、刃部５０の底５１は、低段部５５の最低部である。 In the case of the present embodiment, the blade portion 50 is formed with a high step portion 54 and a notched low step portion 55 recessed toward the back 31 side of the high step portion 54. In other words, the blade portion 50 is formed with a high step portion 54 having a relatively high height with respect to the virtual straight line L1 and a low step portion 55 having a relatively low height.
The electrode 52 is formed from the high step portion 54 to the low step portion 55. The electrode 52 is formed in the electrode forming region 53 shown in FIGS. 5 (a) and 5 (b). The electrode forming region 53 is a region with hatching in FIG. 6A.
In the case of the present embodiment, the bottom 51 of the blade portion 50 is the lowest portion of the low step portion 55.

本実施形態の場合、刃部５０は、１つの高段部５４と、１つの低段部５５とを有している。本実施形態の場合、高段部５４は、平坦面である平坦部５４ａを有している。また、低段部５５の底部は、平坦面である平坦部５５ａとなっている。平坦部５４ａと平坦部５５ａとは互いに平行に配置されている。平坦部５４ａ及び平坦部５５ａは、それぞれ軸部材６１の軸方向に対して平行に配置されている。また、平坦部５４ａ及び平坦部５５ａは、仮想直線Ｌ１に対して平行に配置されている。
また、先端爪部４０の後述する突出方向端縁４３も、仮想直線Ｌ１に対して平行に配置されている。 In the case of the present embodiment, the blade portion 50 has one high step portion 54 and one low step portion 55. In the case of the present embodiment, the high step portion 54 has a flat portion 54a which is a flat surface. Further, the bottom portion of the lower step portion 55 is a flat portion 55a which is a flat surface. The flat portion 54a and the flat portion 55a are arranged in parallel with each other. The flat portion 54a and the flat portion 55a are arranged parallel to the axial direction of the shaft member 61, respectively. Further, the flat portion 54a and the flat portion 55a are arranged in parallel with the virtual straight line L1.
Further, the protruding direction edge 43 of the tip claw portion 40, which will be described later, is also arranged parallel to the virtual straight line L1.

本実施形態の場合、高周波処置具用ナイフ１００を一対の剪断鋏部１０の上記回転軸の軸方向に視たときに（つまり図２及び図３の方向、又はその反対方向に視たときに）、先端爪部４０における基端側の縁辺（以下、基端側縁辺４１（図５（ａ）、図５（ｂ）））と仮想直線Ｌ１とのなす角度αが９０度以下である。
このような構成により、先端爪部４０によって生体組織を十分な把持力で把持することができる。
より詳細には、本実施形態の場合、角度αが９０度である。
ただし、角度αは９０度未満であってもよい。つまり、基端側縁辺４１は仮想直線Ｌ１に対してオーバーハングしていてもよい。 In the case of the present embodiment, when the high frequency treatment tool knife 100 is viewed in the axial direction of the rotation axis of the pair of shear shears 10 (that is, in the directions of FIGS. 2 and 3 or in the opposite direction). ), The angle α formed by the edge on the proximal end side of the tip claw portion 40 (hereinafter, the edge on the proximal end side 41 (FIGS. 5A and 5B)) and the virtual straight line L1 is 90 degrees or less.
With such a configuration, the living tissue can be gripped by the tip claw portion 40 with sufficient gripping force.
More specifically, in the case of this embodiment, the angle α is 90 degrees.
However, the angle α may be less than 90 degrees. That is, the base end side edge 41 may be overhanging with respect to the virtual straight line L1.

なお、先端爪部４０における先端側の縁辺（以下、先端側縁辺４２（図５（ａ）、図５（ｂ）））と仮想直線Ｌ１とのなす角度βは、９０度以上であってもよいし、９０度以下であってもよい。
本実施形態の場合、角度βは略９０度となっている。 Even if the angle β between the tip side edge (hereinafter, tip side edge 42 (FIGS. 5A and 5B)) and the virtual straight line L1 in the tip claw portion 40 is 90 degrees or more. It may be 90 degrees or less.
In the case of this embodiment, the angle β is approximately 90 degrees.

また、本実施形態の場合、先端爪部４０の突出方向の端縁（以下、突出方向端縁４３（図５（ａ）、図５（ｂ）））における先端部４３ａ及び基端部４３ｂが、それぞれＲ面取り形状とされている。
これにより、先端爪部４０によって生体組織をソフトに把持することができる。 Further, in the case of the present embodiment, the tip portion 43a and the base end portion 43b in the end edge in the protrusion direction of the tip claw portion 40 (hereinafter, the end edge 43 in the protrusion direction (FIGS. 5A and 5B)) are formed. , Each has an R chamfered shape.
As a result, the living tissue can be softly gripped by the tip claw portion 40.

つまり、本実施形態の場合、先端爪部４０によって生体組織をソフトに且つ十分な把持力で把持することができる。 That is, in the case of the present embodiment, the living tissue can be gripped softly and with sufficient gripping force by the tip claw portion 40.

一対の剪断鋏部１０の少なくとも一方の剪断鋏部１０には、ストッパー部１１が形成されている。一対の剪断鋏部１０の閉動作は、ストッパー部１１が他方の剪断鋏部１０の刃部５０に当接することで規制されるようになっている。
本実施形態の場合、一対の剪断鋏部１０の各々にストッパー部１１が形成されており、剪断鋏部１０ａのストッパー部１１が剪断鋏部１０ｂの刃部５０に当接するとともに、剪断鋏部１０ｂのストッパー部１１が剪断鋏部１０ａの刃部５０に当接することで、一対の剪断鋏部１０の閉動作が規制される。 A stopper portion 11 is formed on at least one of the shearing shears portions 10 of the pair of shearing shears portions 10. The closing operation of the pair of shear scissors 10 is regulated by the stopper portion 11 coming into contact with the blade portion 50 of the other shear scissors portion 10.
In the case of the present embodiment, the stopper portion 11 is formed in each of the pair of shear scissors portions 10, and the stopper portion 11 of the shear scissors portion 10a comes into contact with the blade portion 50 of the shear scissors portion 10b and the shear scissors portion 10b. When the stopper portion 11 of the above comes into contact with the blade portion 50 of the shear scissors portion 10a, the closing operation of the pair of shear scissors portions 10 is restricted.

ストッパー部１１は、剪断鋏部１０において、図５（ｂ）に示す内側面に形成されている。図６（ｂ）に示すように、ストッパー部１１において、他方の剪断鋏部１０側を向く部位は、平坦面１１ａとなっている。平坦面１１ａは、平坦部５４ａ及び平坦部５５ａに対して平行に配置されている。
ストッパー部１１は、先端片３０において高段部５４が形成されている部位と低段部５５が形成されている部位とのうち、高段部５４が形成されている部位に配置されている。そして、一対の剪断鋏部１０が図２に示すように閉じた際には、平坦面１１ａが他方の剪断鋏部１０の平坦部５４ａに対して面接触することで、一対の剪断鋏部１０の閉動作が規制される。 The stopper portion 11 is formed on the inner side surface of the shear scissors portion 10 as shown in FIG. 5 (b). As shown in FIG. 6B, in the stopper portion 11, the portion of the stopper portion 11 facing the shearing shear portion 10 side is a flat surface 11a. The flat surface 11a is arranged parallel to the flat portion 54a and the flat portion 55a.
The stopper portion 11 is arranged at a portion of the tip piece 30 where the high step portion 54 is formed and a portion where the low step portion 55 is formed, where the high step portion 54 is formed. Then, when the pair of shearing shears 10 is closed as shown in FIG. 2, the flat surface 11a comes into surface contact with the flat portion 54a of the other shearing shears 10, whereby the pair of shearing shears 10 Closing operation is regulated.

基端片２０の先端部には、当該基端片２０を厚み方向に貫通した第１軸支孔２１が形成されている。一対の剪断鋏部１０の第１軸支孔２１に共通の軸部材６１が挿通されて、一対の剪断鋏部１０が軸支されている。
基端片２０の基端部には、当該基端片２０を厚み方向に貫通した第２軸支孔２２が形成されている。一方の剪断鋏部１０ａの第２軸支孔２２とリンク片６５の先端部とに軸部材６３が挿通されて、剪断鋏部１０ａとリンク片６５とが相互に回転可能に軸支されている。同様に、他方の剪断鋏部１０ｂの第２軸支孔２２とリンク片６６の先端部とに軸部材６２が挿通されて、剪断鋏部１０ｂとリンク片６６とが相互に回転可能に軸支されている。 A first shaft support hole 21 that penetrates the base end piece 20 in the thickness direction is formed at the tip end portion of the base end piece 20. A common shaft member 61 is inserted through the first shaft support hole 21 of the pair of shear shears 10, and the pair of shear scissors 10 is pivotally supported.
A second shaft support hole 22 is formed at the base end portion of the base end piece 20 so as to penetrate the base end piece 20 in the thickness direction. A shaft member 63 is inserted through the second shaft support hole 22 of one of the shear shears 10a and the tip of the link piece 65, and the shear scissors 10a and the link piece 65 are pivotally supported so as to be mutually rotatable. .. Similarly, the shaft member 62 is inserted through the second shaft support hole 22 of the other shearing shears 10b and the tip of the link piece 66, and the shearing shears 10b and the link piece 66 are mutually rotatable. Has been done.

図５（ａ）に示すように、基端片２０の外側面には段差部２３が形成されている。基端片２０において段差部２３よりも基端側の部位は、段差部２３よりも先端側の部位よりも薄くなっている。
図４に示すように、基端片２０において段差部２３よりも基端側の部位と先端側の部位との厚みの差は、リンク片６５、６６の厚みよりも若干大きい程度に設定されているか、又は、リンク片６５、６６の厚みと同等に設定されている。 As shown in FIG. 5A, a step portion 23 is formed on the outer surface of the base end piece 20. In the base end piece 20, the portion on the proximal end side of the step portion 23 is thinner than the portion on the distal end side of the step portion 23.
As shown in FIG. 4, the difference in thickness between the portion on the proximal end side and the portion on the distal end side of the step portion 23 in the proximal end piece 20 is set to be slightly larger than the thickness of the link pieces 65 and 66. Or, it is set to be the same as the thickness of the link pieces 65 and 66.

図４に示すように、保持枠８０の一対のブラケット８２は、一対の剪断鋏部１０の基端片２０を一対の剪断鋏部１０の回転軸（軸部材６１）の軸方向における両側から挟持しているとともに、当該回転軸において軸支している。一対のブラケット８２は、当該ブラケット８２の先端部において基端片２０を挟持及び軸支している。
一対のブラケット８２の各々の先端部において、一対のブラケット８２の各々の対向面８２ａに対する裏面である外面８２ｂが平坦に形成されている。しかも、一対のブラケット８２の各々の先端部の外面８２ｂどうしの距離が、ブラケット８２の基端部の外面どうしの距離よりも小さい。つまり、ブラケット８２の先端部は、外面側が削られて平坦となったような形状となっている。
このため、ブラケット８２と生体組織や鉗子孔の周壁との干渉を抑制することができる。また、ブラケット８２に対する塗装が容易であるという効果も得られる。 As shown in FIG. 4, the pair of brackets 82 of the holding frame 80 sandwich the base end piece 20 of the pair of shearing shears 10 from both sides in the axial direction of the rotation axis (shaft member 61) of the pair of shearing shears 10. At the same time, it is pivotally supported on the rotating shaft. The pair of brackets 82 sandwich and pivotally support the base end piece 20 at the tip of the bracket 82.
At the tip of each of the pair of brackets 82, the outer surface 82b, which is the back surface of the pair of brackets 82 with respect to the facing surfaces 82a, is formed flat. Moreover, the distance between the outer surfaces 82b of each tip of the pair of brackets 82 is smaller than the distance between the outer surfaces of the base ends of the brackets 82. That is, the tip portion of the bracket 82 has a shape such that the outer surface side is scraped off and becomes flat.
Therefore, it is possible to suppress the interference between the bracket 82 and the biological tissue or the peripheral wall of the forceps hole. Further, the effect that the bracket 82 can be easily painted can be obtained.

以上のような第１実施形態によれば、仮想直線Ｌ１を基準とする高さが、先端爪部４０の高さよりも、刃部５０における電極５２の形成領域（電極形成領域５３）のうち最も高い位置の高さの方が低いことにより、一対の剪断鋏部１０を閉じる際に刃部５０によって生体組織を押し戻す動作が抑制される。このため、一対の剪断鋏部１０を閉じる際に先端爪部４０を速やかに生体組織に食い込ませることができ、一対の剪断鋏部１０によって生体組織をより確実に把持することが可能である。 According to the first embodiment as described above, the height with respect to the virtual straight line L1 is the most in the electrode 52 forming region (electrode forming region 53) in the blade portion 50, rather than the height of the tip claw portion 40. Since the height at the higher position is lower, the action of pushing back the living tissue by the blade portion 50 when closing the pair of shear shears portions 10 is suppressed. Therefore, when closing the pair of shearing shears 10, the tip claw portion 40 can be quickly bitten into the living tissue, and the pair of shearing shears 10 can grip the living tissue more reliably.

〔第２実施形態〕
次に、図８及び図９を用いて第２実施形態を説明する。
本実施形態に係る高周波処置具２００及び高周波処置具用ナイフ１００は、以下に説明する点で、上記の第１実施形態に係る高周波処置具２００及び高周波処置具用ナイフ１００と相違しており、その他の点では、上記の第１実施形態に係る高周波処置具２００及び高周波処置具用ナイフ１００と同様に構成されている。 [Second Embodiment]
Next, the second embodiment will be described with reference to FIGS. 8 and 9.
The high-frequency treatment tool 200 and the high-frequency treatment tool knife 100 according to the present embodiment are different from the high-frequency treatment tool 200 and the high-frequency treatment tool knife 100 according to the first embodiment above in the points described below. In other respects, it is configured in the same manner as the high frequency treatment tool 200 and the high frequency treatment tool knife 100 according to the first embodiment.

図８及び図９に示すように、本実施形態の場合、刃部５０は、複数の低段部５５と、これら低段部５５どうしの間に位置する高段部５４である中間高段部５６と、を有する。
本実施形態によれば、一対の剪断鋏部１０の中間高段部５６によって生体組織を把持することができるため、より十分な把持力で生体組織を把持することができる。 As shown in FIGS. 8 and 9, in the case of the present embodiment, the blade portion 50 is an intermediate high step portion which is a plurality of low step portions 55 and a high step portion 54 located between these low step portions 55. 56 and.
According to the present embodiment, since the living tissue can be gripped by the intermediate high step portion 56 of the pair of shearing shears 10, the living tissue can be gripped with a more sufficient gripping force.

本実施形態の場合、刃部５０が２つの低段部５５を有し、これら２つの低段部５５どうしの間に１つの中間高段部５６が配置されている。また、基端側の低段部５５の更に基端側に高段部５４が配置されている。
本実施形態の場合、電極基端位置５３ａは、例えば、基端側の低段部５５の基端位置（基端側の高段部５４（中間高段部５６でない方の高段部５４）の先端位置となっている。 In the case of the present embodiment, the blade portion 50 has two low step portions 55, and one intermediate high step portion 56 is arranged between the two low step portions 55. Further, the high step portion 54 is arranged further on the base end side of the low step portion 55 on the base end side.
In the case of the present embodiment, the electrode base end position 53a is, for example, the base end position of the low step portion 55 on the base end side (high step portion 54 on the base end side (high step portion 54 other than the intermediate high step portion 56)). It is the tip position of.

本実施形態の場合、ストッパー部１１は、先端片３０において基端側の低段部５５が形成されている部位に配置されている。そして、一対の剪断鋏部１０が図８に示すように閉じた際には、平坦面１１ａが他方の剪断鋏部１０の基端側の低段部５５の平坦部５５ａに対して面接触することで、一対の剪断鋏部１０の閉動作が規制される。 In the case of the present embodiment, the stopper portion 11 is arranged at a portion of the tip piece 30 where the lower step portion 55 on the proximal end side is formed. Then, when the pair of shear scissors 10 is closed as shown in FIG. 8, the flat surface 11a comes into surface contact with the flat portion 55a of the lower step portion 55 on the base end side of the other shear scissors portion 10. As a result, the closing operation of the pair of shear shears 10 is restricted.

複数の（本実施形態の場合、２つの）低段部５５の深さは、互いに等しくてもよいし、互いに異なっていてもよい。本実施形態の場合は、２つの低段部５５の深さが互いに等しく、これら２つの低段部５５の底が上記仮想直線上に位置する。 The depths of the plurality of (in the case of the present embodiment, the two) lower portions 55 may be equal to or different from each other. In the case of the present embodiment, the depths of the two lower steps 55 are equal to each other, and the bottoms of the two lower steps 55 are located on the virtual straight line.

〔第３実施形態〕
次に、図１０から図１２を用いて第３実施形態を説明する。
本実施形態に係る高周波処置具２００及び高周波処置具用ナイフ１００は、以下に説明する点で、上記の第１実施形態に係る高周波処置具２００及び高周波処置具用ナイフ１００と相違しており、その他の点では、上記の第１実施形態に係る高周波処置具２００及び高周波処置具用ナイフ１００と同様に構成されている。 [Third Embodiment]
Next, the third embodiment will be described with reference to FIGS. 10 to 12.
The high-frequency treatment tool 200 and the high-frequency treatment tool knife 100 according to the present embodiment are different from the high-frequency treatment tool 200 and the high-frequency treatment tool knife 100 according to the first embodiment above in the points described below. In other respects, it is configured in the same manner as the high frequency treatment tool 200 and the high frequency treatment tool knife 100 according to the first embodiment.

図１０から図１２に示すように、本実施形態の場合、刃部５０は、複数の低段部５５と、これら低段部５５どうしの間に位置する高段部５４である中間高段部５６と、を有する。
本実施形態によれば、一対の剪断鋏部１０の中間高段部５６によって生体組織を把持することができるため、より十分な把持力で生体組織を把持することができる。 As shown in FIGS. 10 to 12, in the case of the present embodiment, the blade portion 50 is an intermediate high step portion which is a plurality of low step portions 55 and a high step portion 54 located between these low step portions 55. 56 and.
According to the present embodiment, since the living tissue can be gripped by the intermediate high step portion 56 of the pair of shearing shears 10, the living tissue can be gripped with a more sufficient gripping force.

本実施形態の場合、刃部５０は、複数の中間高段部５６を有し、複数の中間高段部５６のうち、基端側に位置する中間高段部５６ほど、仮想直線Ｌ１を基準とする高さが低い。
このため、一対の剪断鋏部１０の中間高段部５６どうしで生体組織を挟むタイミングを互いに近づけることができる。 In the case of the present embodiment, the blade portion 50 has a plurality of intermediate high step portions 56, and among the plurality of intermediate high step portions 56, the intermediate high step portion 56 located on the proximal end side is based on the virtual straight line L1. The height is low.
Therefore, the timing of sandwiching the biological tissue between the intermediate high-stage portions 56 of the pair of shear shears 10 can be brought close to each other.

本実施形態の場合、刃部５０は２つの中間高段部５６を有している。 In the case of the present embodiment, the blade portion 50 has two intermediate high step portions 56.

より詳細には、図１１に示すように、本実施形態の場合、一対の剪断鋏部１０が閉じられて、一対の剪断鋏部１０の回転軸の軸方向において一対の剪断鋏部１０の先端爪部４０どうしが重なり始めたときに、一対の剪断鋏部１０の互いに対応する中間高段部５６どうしが接触する。
このため、一対の剪断鋏部１０の中間高段部５６どうしで生体組織を挟むタイミングを実質的に同タイミングに揃えることができる。 More specifically, as shown in FIG. 11, in the case of the present embodiment, the pair of shearing shears 10 is closed, and the tips of the pair of shearing shears 10 are axially oriented along the axis of rotation of the pair of shearing shears 10. When the claw portions 40 start to overlap each other, the intermediate high-stage portions 56 of the pair of shear shears 10 corresponding to each other come into contact with each other.
Therefore, the timing of sandwiching the biological tissue between the intermediate high-stage portions 56 of the pair of shear shears 10 can be substantially aligned at the same timing.

また、図１０に示すように、高周波処置具用ナイフ１００を上記回転軸の軸方向に視たときに、中間高段部５６における基端側の縁辺（以下、基端側縁辺５７）と上記仮想直線Ｌ１とのなす角度が９０度以下である。
このような構成により、中間高段部５６によって生体組織をより十分な把持力で把持することができる。
本実施形態の場合、複数の中間高段部５６の各々について、基端側縁辺５７と仮想直線Ｌ１とのなす角度が９０度以下である。
より詳細には、本実施形態の場合、基端側縁辺５７と仮想直線Ｌ１とのなす角度が９０度である。ただし、この角度は９０度未満であってもよい。 Further, as shown in FIG. 10, when the knife 100 for a high-frequency treatment tool is viewed in the axial direction of the rotation axis, the edge on the proximal end side of the intermediate high step portion 56 (hereinafter referred to as the proximal edge side edge 57) and the above. The angle formed by the virtual straight line L1 is 90 degrees or less.
With such a configuration, the living tissue can be gripped by the intermediate high step portion 56 with a more sufficient gripping force.
In the case of the present embodiment, the angle formed by the base end side edge 57 and the virtual straight line L1 is 90 degrees or less for each of the plurality of intermediate high-stage portions 56.
More specifically, in the case of the present embodiment, the angle formed by the base end side edge 57 and the virtual straight line L1 is 90 degrees. However, this angle may be less than 90 degrees.

また、高周波処置具用ナイフ１００を上記回転軸の軸方向に視たときに、中間高段部５６における先端側の縁辺（以下、先端側縁辺５８）と上記仮想直線Ｌ１とのなす角度が９０度以下である。
このような構成により、中間高段部５６によって生体組織をより十分な把持力で把持することができる。
本実施形態の場合、複数の中間高段部５６の各々について、先端側縁辺５８と仮想直線Ｌ１とのなす角度が９０度以下である。
より詳細には、本実施形態の場合、中間高段部５６と仮想直線Ｌ１とのなす角度が９０度である。ただし、この角度は９０度未満であってもよい。 Further, when the knife 100 for a high-frequency treatment tool is viewed in the axial direction of the rotation axis, the angle formed by the tip-side edge (hereinafter referred to as the tip-side edge 58) in the intermediate high step portion 56 and the virtual straight line L1 is 90. It is less than the degree.
With such a configuration, the living tissue can be gripped by the intermediate high step portion 56 with a more sufficient gripping force.
In the case of the present embodiment, the angle formed by the tip end side edge 58 and the virtual straight line L1 is 90 degrees or less for each of the plurality of intermediate high-stage portions 56.
More specifically, in the case of the present embodiment, the angle formed by the intermediate high step portion 56 and the virtual straight line L1 is 90 degrees. However, this angle may be less than 90 degrees.

また、中間高段部５６の突出方向の端縁（以下、突出方向端縁５９）における先端部５９ａ及び基端部５９ｂが、それぞれＲ面取り形状とされている。
これにより、中間高段部５６によって生体組織をソフトに把持することができる。 Further, the tip portion 59a and the base end portion 59b at the end edge in the protrusion direction (hereinafter, the end edge 59 in the protrusion direction) of the intermediate high step portion 56 have an R chamfered shape, respectively.
As a result, the biological tissue can be softly gripped by the intermediate high step portion 56.

つまり、本実施形態の場合、中間高段部５６によって生体組織をソフトに且つ十分な把持力で把持することができる。 That is, in the case of the present embodiment, the biological tissue can be gripped softly and with sufficient gripping force by the intermediate high step portion 56.

以上、図面を参照して各実施形態を説明したが、これらは本発明の例示であり、上記以外の様々な構成を採用することもできる。 Although each embodiment has been described above with reference to the drawings, these are examples of the present invention, and various configurations other than the above can be adopted.

例えば、上記においては、先端爪部４０の基端側縁辺４１と仮想直線Ｌ１とのなす角度が９０度以下の例を説明したが、当該角度は９０度以上であってもよい。 For example, in the above, an example in which the angle formed by the base end side edge 41 of the tip claw portion 40 and the virtual straight line L1 is 90 degrees or less has been described, but the angle may be 90 degrees or more.

また、上記においては、低段部５５が平坦部５５ａを有する例を説明したが、剪断鋏部１０の回転軸の方向に視たときの低段部５５の形状は、円弧状の切欠形状であってもよい。 Further, in the above, the example in which the low step portion 55 has the flat portion 55a has been described, but the shape of the low step portion 55 when viewed in the direction of the rotation axis of the shear scissors portion 10 is an arcuate notch shape. There may be.

また、上記の各実施形態は、本発明の主旨を逸脱しない範囲で、適宜に組み合わせることができる。 In addition, each of the above embodiments can be appropriately combined as long as the gist of the present invention is not deviated.

本実施形態は以下の技術思想を包含する。
（１）医療用の高周波処置具の先端部に設けられ、内視鏡の鉗子孔に挿入して用いられて生体組織を切開する高周波処置具用ナイフであって、
共通の回転軸において軸支されて相互に開閉可能となっており、前記生体組織を剪断する刃部をそれぞれ有する一対の剪断鋏部を備え、
前記一対の剪断鋏部の各々は、
当該剪断鋏部の基端側に形成されていて前記回転軸において軸支されている基端片と、
当該剪断鋏部の先端に形成されている先端爪部と、
当該剪断鋏部における前記先端爪部と前記基端片との間に形成されている刃部と、
を有し、
前記刃部には電極が形成されており、
前記回転軸の軸中心と前記刃部の底とを結ぶ仮想直線を基準とする高さが、前記先端爪部の高さよりも、前記刃部における前記電極の形成領域のうち最も高い位置の高さの方が低い高周波処置具用ナイフ。
（２）当該高周波処置具用ナイフを前記回転軸の軸方向に視たときに、前記先端爪部における基端側の縁辺と前記仮想直線とのなす角度が９０度以下である（１）に記載の高周波処置具用ナイフ。
（３）前記先端爪部の突出方向の端縁における先端部及び基端部が、それぞれＲ面取り形状とされている（１）又は（２）に記載の高周波処置具用ナイフ。
（４）前記一対の剪断鋏部の少なくとも一方の剪断鋏部には、ストッパー部が形成されており、
前記一対の剪断鋏部の閉動作は、前記ストッパー部が他方の剪断鋏部の前記刃部に当接することで規制される（１）から（３）のいずれか一項に記載の高周波処置具用ナイフ。
（５）前記刃部には、高段部と、前記高段部よりも背側に向けて窪んだ切欠形状の低段部と、が形成されており、
前記高段部から前記低段部に亘って前記電極が形成されており、
前記刃部の前記底は、前記低段部の最低部である（１）から（４）のいずれか一項に記載の高周波処置具用ナイフ。
（６）前記刃部は、複数の前記低段部と、これら低段部どうしの間に位置する前記高段部である中間高段部と、を有する（５）に記載の高周波処置具用ナイフ。
（７）前記刃部は、複数の前記中間高段部を有し、
前記複数の中間高段部のうち、基端側に位置する中間高段部ほど、前記仮想直線を基準とする高さが低い（６）に記載の高周波処置具用ナイフ。
（８）前記一対の剪断鋏部が閉じられて、前記回転軸の軸方向において前記一対の剪断鋏部の前記先端爪部どうしが重なり始めたときに、前記一対の剪断鋏部の互いに対応する前記中間高段部どうしが接触する（６）又は（７）に記載の高周波処置具用ナイフ。
（９）当該高周波処置具用ナイフを前記回転軸の軸方向に視たときに、前記中間高段部における基端側の縁辺と前記仮想直線とのなす角度が９０度以下である（６）から（８）のいずれか一項に記載の高周波処置具用ナイフ。
（１０）当該高周波処置具用ナイフを前記回転軸の軸方向に視たときに、前記中間高段部における先端側の縁辺と前記仮想直線とのなす角度が９０度以下である（６）から（９）のいずれか一項に記載の高周波処置具用ナイフ。
（１１）前記中間高段部の突出方向の端縁における先端部及び基端部が、それぞれＲ面取り形状とされている（６）から（１０）のいずれか一項に記載の高周波処置具用ナイフ。
（１２）前記一対の剪断鋏部の前記基端片を前記回転軸の軸方向における両側から挟持しているとともに前記回転軸において軸支している一対のブラケットを備え、
前記一対のブラケットは、当該ブラケットの先端部において前記基端片を挟持及び軸支しており、
前記一対のブラケットの各々の先端部において、前記一対のブラケットの各々の対向面に対する裏面である外面が平坦に形成されており、
且つ、
前記一対のブラケットの各々の先端部の外面どうしの距離が、前記ブラケットの基端部の外面どうしの距離よりも小さい（１）から（１１）のいずれか一項に記載の高周波処置具用ナイフ。
（１３）（１）から（１２）のいずれか一項に記載の高周波処置具用ナイフを先端部に有し、基端側には、前記一対の剪断鋏部の開閉操作を行うための操作部を有する医療用の高周波処置具。 This embodiment includes the following technical ideas.
(1) A knife for a high-frequency treatment tool that is provided at the tip of a high-frequency treatment tool for medical use and is used by inserting it into a forceps hole of an endoscope to incise a living tissue.
It is axially supported on a common axis of rotation and can be opened and closed mutually, and is equipped with a pair of shearing shears each having a blade for shearing the biological tissue.
Each of the pair of shear shears
A base end piece formed on the base end side of the shear shear portion and supported by the rotation axis, and a base end piece.
The tip claw part formed at the tip of the shear shear part and
A blade portion formed between the tip claw portion and the base end piece in the shear shear portion, and a blade portion.
Have,
Electrodes are formed on the blade portion, and
The height with respect to the virtual straight line connecting the axis center of the rotating shaft and the bottom of the blade portion is higher than the height of the tip claw portion at the highest position of the electrode forming region in the blade portion. A knife for high frequency treatment tools with a lower height.
(2) When the knife for high-frequency treatment tool is viewed in the axial direction of the rotation axis, the angle formed by the edge on the proximal end side of the tip claw portion and the virtual straight line is 90 degrees or less (1). Knife for high frequency treatment tools described.
(3) The knife for a high-frequency treatment tool according to (1) or (2), wherein the tip portion and the base end portion at the end edge in the protruding direction of the tip claw portion have an R chamfered shape, respectively.
(4) A stopper portion is formed on at least one shearing shears portion of the pair of shearing shears portions.
The high frequency treatment tool according to any one of (1) to (3), wherein the closing operation of the pair of shear scissors is regulated by the stopper portion coming into contact with the blade portion of the other shear scissors portion. Knife for.
(5) The blade portion is formed with a high step portion and a notched low step portion recessed toward the back side of the high step portion.
The electrode is formed from the high step portion to the low step portion.
The knife for a high frequency treatment tool according to any one of (1) to (4), wherein the bottom of the blade portion is the lowest portion of the low step portion.
(6) The high-frequency treatment tool according to (5), wherein the blade portion has a plurality of the low-stage portions and an intermediate high-stage portion which is the high-stage portion located between the low-stage portions. knife.
(7) The blade portion has a plurality of the intermediate high-stage portions.
The knife for high frequency treatment tool according to (6), wherein the height of the intermediate high step portion located on the proximal end side is lower than that of the plurality of intermediate high step portions with respect to the virtual straight line.
(8) When the pair of shearing shears are closed and the tip claws of the pair of shearing shears start to overlap each other in the axial direction of the rotation axis, the pair of shearing shears correspond to each other. The knife for a high-frequency treatment tool according to (6) or (7), wherein the intermediate high-stage portions come into contact with each other.
(9) When the knife for high-frequency treatment tool is viewed in the axial direction of the rotation axis, the angle formed by the edge on the proximal end side in the intermediate high step portion and the virtual straight line is 90 degrees or less (6). To the knife for high frequency treatment tool according to any one of (8).
(10) From (6), when the knife for high frequency treatment tool is viewed in the axial direction of the rotation axis, the angle formed by the edge on the tip side in the intermediate high step portion and the virtual straight line is 90 degrees or less. The knife for high frequency treatment tool according to any one of (9).
(11) The high-frequency treatment tool according to any one of (6) to (10), wherein the tip end portion and the base end portion at the end edge in the protruding direction of the intermediate high step portion each have an R chamfer shape. knife.
(12) A pair of brackets that sandwich the base end piece of the pair of shear shears from both sides in the axial direction of the rotating shaft and are axially supported by the rotating shaft are provided.
The pair of brackets sandwich and pivotally support the base end piece at the tip of the bracket.
At the tip of each of the pair of brackets, the outer surface which is the back surface of the pair of brackets with respect to the facing surface is formed flat.
and,
The knife for high frequency treatment tool according to any one of (1) to (11), wherein the distance between the outer surfaces of the tips of the pair of brackets is smaller than the distance between the outer surfaces of the base ends of the brackets. ..
(13) An operation for opening and closing the pair of shear scissors on the base end side, with the knife for high-frequency treatment tool according to any one of (1) to (12) at the tip. High frequency treatment tool for medical use with a part.

１０、１０ａ、１０ｂ 剪断鋏部
１１ ストッパー部
１１ａ 平坦面
１２ 絶縁性被膜
２０ 基端片
２１ 第１軸支孔
２１ａ 軸中心
２２ 第２軸支孔
２３ 段差部
３０ 先端片
３１ 背
４０ 先端爪部
４１ 基端側縁辺
４２ 先端側縁辺
４３ 突出方向端縁
４３ａ 先端部
４３ｂ 基端部
５０ 刃部
５１ 底
５２ 電極
５３ 電極形成領域
５３ａ 電極基端位置
５４ 高段部
５４ａ 平坦部
５５ 低段部
５５ａ 平坦部
５６ 中間高段部
５７ 基端側縁辺
５８ 先端側縁辺
５９ 突出方向端縁
５９ａ 先端部
５９ｂ 基端部
６１、６２、６３、６４ 軸部材
６５、６６ リンク片
６７ 進退部
６８ 操作ワイヤ
７０ シース
７１ コイル
７２ 絶縁性被膜
８０ 保持枠
８１ 基端部
８２ ブラケット
８２ａ 対向面
８２ｂ 外面
９０ 手元操作部（操作部）
９１ 給電部
９２ 指掛リング
９３ スライダ
９４ 回転操作部
９５ 軸部
Ｌ１ 仮想直線
Ｌ２ 直線
Ｌ３ 直線
１００ 高周波処置具用ナイフ
２００ 医療用の高周波処置具
３００ 内視鏡
３１０ フード 10, 10a, 10b Shearing shears 11 Stopper 11a Flat surface 12 Insulating coating 20 Base end piece 21 First shaft support hole 21a Shaft center 22 Second shaft support hole 23 Step part 30 Tip piece 31 Back 40 Tip claw part 41 Base end side edge 42 Tip side edge 43 Protruding direction edge 43a Tip 43b Base end 50 Blade 51 Bottom 52 Electrode 53 Electrode forming region 53a Electrode base end position 54 High step 54a Flat part 55 Low step 55a Flat part 56 Intermediate high step 57 Base end side edge 58 Tip side edge 59 Protruding direction edge 59a Tip 59b Base end 61, 62, 63, 64 Shaft member 65, 66 Link piece 67 Advance / retreat 68 Operation wire 70 Sheath 71 Coil 72 Insulation coating 80 Holding frame 81 Base end 82 Bracket 82a Facing surface 82b Outer surface 90 Hand operation unit (operation unit)
91 Power supply unit 92 Finger hook ring 93 Slider 94 Rotation operation unit 95 Shaft unit L1 Virtual straight line L2 Straight line L3 Straight line 100 Knife for high frequency treatment tool 200 High frequency treatment tool for medical use 300 Endoscope 310 Hood

Claims (13)

医療用の高周波処置具の先端部に設けられ、内視鏡の鉗子孔に挿入して用いられて生体組織を切開する高周波処置具用ナイフであって、
共通の回転軸において軸支されて相互に開閉可能となっており、前記生体組織を剪断する刃部をそれぞれ有する一対の剪断鋏部を備え、
前記一対の剪断鋏部の各々は、
当該剪断鋏部の基端側に形成されていて前記回転軸において軸支されている基端片と、
当該剪断鋏部の先端に形成されている先端爪部と、
当該剪断鋏部における前記先端爪部と前記基端片との間に形成されている刃部と、
を有し、
前記刃部には電極が形成されており、
前記刃部の底は、前記回転軸の軸方向に視た形状が直線状となっている直線部を含み、
前記直線部は、前記回転軸の軸中心と同一直線上に配置されており、
前記回転軸の前記軸中心と前記刃部の前記直線部とを結ぶ仮想直線を基準とする高さが、前記先端爪部の高さよりも、前記刃部における前記電極の形成領域のうち最も高い位置の高さの方が低い高周波処置具用ナイフ。 A knife for high-frequency treatment tools that is provided at the tip of a high-frequency treatment tool for medical use and is used by inserting it into the forceps hole of an endoscope to make an incision in a living tissue.
It is axially supported on a common axis of rotation and can be opened and closed mutually, and is equipped with a pair of shearing shears each having a blade for shearing the biological tissue.
Each of the pair of shear shears
A base end piece formed on the base end side of the shear shear portion and supported by the rotation axis, and a base end piece.
The tip claw part formed at the tip of the shear shear part and
A blade portion formed between the tip claw portion and the base end piece in the shear shear portion, and a blade portion.
Have,
Electrodes are formed on the blade portion, and
The bottom of the blade portion includes a straight portion having a linear shape when viewed in the axial direction of the rotation axis.
The straight line portion is arranged on the same straight line as the axis center of the rotation axis.
Height relative to the virtual straight line connecting the said straight portion of the shaft center and the blade portion of the rotary shaft, the than the height of the tip claw portion, the highest among the formation area of the electrode in the blade section A knife for high frequency treatment tools with a lower position height. 当該高周波処置具用ナイフを前記回転軸の軸方向に視たときに、前記先端爪部における基端側の縁辺と前記仮想直線とのなす内角の角度が９０度以下である請求項１に記載の高周波処置具用ナイフ。 The first aspect of claim 1, wherein the angle between the edge on the proximal end side of the tip claw portion and the virtual straight line is 90 degrees or less when the knife for high-frequency treatment tool is viewed in the axial direction of the rotation axis. Knife for high frequency treatment tools. 前記先端爪部の突出方向の端縁における先端部及び基端部が、それぞれＲ面取り形状とされている請求項１又は２に記載の高周波処置具用ナイフ。 The knife for a high-frequency treatment tool according to claim 1 or 2, wherein the tip portion and the base end portion at the end edge in the protruding direction of the tip claw portion have an R chamfer shape, respectively. 前記一対の剪断鋏部の少なくとも一方の剪断鋏部には、ストッパー部が形成されており、
前記一対の剪断鋏部の閉動作は、前記ストッパー部が他方の剪断鋏部の前記刃部に当接することで規制される請求項１から３のいずれか一項に記載の高周波処置具用ナイフ。 A stopper portion is formed on at least one shearing shears portion of the pair of shearing shears portions.
The knife for a high frequency treatment tool according to any one of claims 1 to 3, wherein the closing operation of the pair of shear scissors is regulated by the stopper portion coming into contact with the blade portion of the other shear scissors portion. .. 前記刃部には、高段部と、前記高段部よりも背側に向けて窪んだ切欠形状の低段部と、が形成されており、
前記一対の剪断鋏部は、前記回転軸の軸方向に対して直交する平面内で相対的に回動し、
前記高段部から前記低段部に亘って前記電極が形成されており、
前記刃部の前記底は、前記低段部の最低部であり、
前記最低部は、平坦面である平坦部となっており、
前記平坦部は、前記回転軸の軸方向に対して平行に配置されている請求項１から４のいずれか一項に記載の高周波処置具用ナイフ。 The blade portion is formed with a high step portion and a notched low step portion recessed toward the back side of the high step portion.
The pair of shear shears rotate relative to each other in a plane orthogonal to the axial direction of the axis of rotation.
The electrode is formed from the high step portion to the low step portion.
Said bottom of said blade section, Ri lowest portion der of the low stage portion,
The lowest part is a flat part which is a flat surface.
The knife for a high frequency treatment tool according to any one of claims 1 to 4, wherein the flat portion is arranged parallel to the axial direction of the rotation axis. 前記刃部は、複数の前記低段部と、これら低段部どうしの間に位置する前記高段部である中間高段部と、を有する請求項５に記載の高周波処置具用ナイフ。 The knife for a high frequency treatment tool according to claim 5, wherein the blade portion has a plurality of the low step portions and an intermediate high step portion which is a high step portion located between the low step portions. 前記刃部は、複数の前記中間高段部を有し、
前記複数の中間高段部のうち、基端側に位置する中間高段部ほど、前記仮想直線を基準とする高さが低い請求項６に記載の高周波処置具用ナイフ。 The blade portion has a plurality of the intermediate high-stage portions, and the blade portion has a plurality of intermediate high-stage portions.
The knife for a high frequency treatment tool according to claim 6, wherein the height of the intermediate high step portion located on the proximal end side is lower than that of the plurality of intermediate high step portions with respect to the virtual straight line. 前記一対の剪断鋏部が閉じられて、前記回転軸の軸方向において前記一対の剪断鋏部の前記先端爪部どうしが重なり始めたときに、前記一対の剪断鋏部の互いに対応する前記中間高段部どうしが接触する請求項６又は７に記載の高周波処置具用ナイフ。 When the pair of shearing shears are closed and the tip claws of the pair of shearing shears begin to overlap each other in the axial direction of the axis of rotation, the intermediate heights of the pair of shearing shears corresponding to each other. The knife for a high frequency treatment tool according to claim 6 or 7, wherein the steps are in contact with each other. 当該高周波処置具用ナイフを前記回転軸の軸方向に視たときに、前記中間高段部における基端側の縁辺と前記仮想直線とのなす角度が９０度以下である請求項６から８のいずれか一項に記載の高周波処置具用ナイフ。 Claims 6 to 8 wherein the angle formed by the edge on the proximal end side of the intermediate high step portion and the virtual straight line is 90 degrees or less when the knife for high frequency treatment tool is viewed in the axial direction of the rotation axis. The knife for high frequency treatment tool according to any one item. 当該高周波処置具用ナイフを前記回転軸の軸方向に視たときに、前記中間高段部における先端側の縁辺と前記仮想直線とのなす角度が９０度以下である請求項６から９のいずれか一項に記載の高周波処置具用ナイフ。 6. Knife for high frequency treatment tool according to item 1. 前記中間高段部の突出方向の端縁における先端部及び基端部が、それぞれＲ面取り形状とされている請求項６から１０のいずれか一項に記載の高周波処置具用ナイフ。 The knife for a high frequency treatment tool according to any one of claims 6 to 10, wherein the tip end portion and the base end portion at the end edge in the protruding direction of the intermediate high step portion each have an R chamfer shape. 前記一対の剪断鋏部の前記基端片を前記回転軸の軸方向における両側から挟持しているとともに前記回転軸において軸支している一対のブラケットを備え、
前記一対のブラケットは、当該ブラケットの先端部において前記基端片を挟持及び軸支しており、
前記一対のブラケットの各々の先端部において、前記一対のブラケットの各々の対向面に対する裏面である外面が平坦に形成されており、
且つ、
前記一対のブラケットの各々の先端部の外面どうしの距離が、前記ブラケットの基端部の外面どうしの距離よりも小さい請求項１から１１のいずれか一項に記載の高周波処置具用ナイフ。 The base end piece of the pair of shear shears is sandwiched from both sides in the axial direction of the rotating shaft, and a pair of brackets that are axially supported by the rotating shaft are provided.
The pair of brackets sandwich and pivotally support the base end piece at the tip of the bracket.
At the tip of each of the pair of brackets, the outer surface which is the back surface of the pair of brackets with respect to the facing surface is formed flat.
and,
The knife for a high frequency treatment tool according to any one of claims 1 to 11, wherein the distance between the outer surfaces of the tips of the pair of brackets is smaller than the distance between the outer surfaces of the base ends of the brackets. 請求項１から１２のいずれか一項に記載の高周波処置具用ナイフを先端部に有し、基端側には、前記一対の剪断鋏部の開閉操作を行うための操作部を有する医療用の高周波処置具。 The knife for high frequency treatment tool according to any one of claims 1 to 12 is provided at the tip end, and the base end side is provided with an operation portion for opening and closing the pair of shear scissors portions for medical use. High frequency treatment tool.
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