JP6061817B2 - Endoscope - Google Patents

Endoscope Download PDF

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JP6061817B2
JP6061817B2 JP2013172475A JP2013172475A JP6061817B2 JP 6061817 B2 JP6061817 B2 JP 6061817B2 JP 2013172475 A JP2013172475 A JP 2013172475A JP 2013172475 A JP2013172475 A JP 2013172475A JP 6061817 B2 JP6061817 B2 JP 6061817B2
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tip
joint piece
distal end
end side
distal
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JP2015039550A (en
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昌典 濱崎
昌典 濱崎
高範 渡辺
高範 渡辺
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Olympus Corp
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Description

本発明は、特に、高周波処置具を処置具チャンネルに挿通して金属製の先端部本体から突出させて患者の体腔内組織の処置を行うのに好適な内視鏡に関する。   The present invention particularly relates to an endoscope suitable for treating a tissue in a body cavity of a patient by inserting a high-frequency treatment instrument through a treatment instrument channel and projecting it from a metal tip body.

従来、内視鏡においては、挿入部の先端部に設けられた金属製の先端部本体が、湾曲部、可撓管部、及び、操作部等を介してコネクタまで導通され、これにより、高周波処置時に漏れ電流が発生した場合にも当該漏れ電流を高周波電源装置に帰還させることが可能となっている。   Conventionally, in an endoscope, a metal distal end body provided at the distal end of an insertion portion is conducted to a connector via a bending portion, a flexible tube portion, an operation portion, etc. Even when a leakage current occurs during treatment, the leakage current can be fed back to the high-frequency power supply device.

ここで、一般に、湾曲部は複数の関節駒を連結した構造をなしており、先端部本体は、湾曲部の先端に位置する関節駒（先端関節駒）を通じて、湾曲部と電気的に接続される。この場合において、先端部本体と先端関節駒とは、通常、ビス止め等によって連結されることにより、電気的に接続される。   Here, in general, the bending portion has a structure in which a plurality of joint pieces are connected, and the distal end body is electrically connected to the bending portion through a joint piece (tip joint piece) located at the distal end of the bending portion. The In this case, the distal end portion main body and the distal end joint piece are usually electrically connected by being coupled by screws or the like.

しかしながら、上述のように先端部本体と先端関節駒とをビス止め等によって連結する構成では、先端部本体にビス孔等を形成するためのスペースを確保する必要があるため、先端部本体等の小型化が困難となる。   However, in the configuration in which the distal end body and the distal joint piece are connected by screws or the like as described above, it is necessary to secure a space for forming a screw hole or the like in the distal end body. Miniaturization becomes difficult.

これに対し、例えば、特許文献１には、先端部本体と、接続部材と、第１の節輪（先端関節駒）とを接着によって連結する技術が開示されており、その際、各部材に設けた突起によって接着剤層を削り落とすことにより各部材を電気的に導通させる技術が開示されている。   On the other hand, for example, Patent Document 1 discloses a technique for connecting a tip portion main body, a connection member, and a first node ring (tip joint piece) by bonding. A technique is disclosed in which each member is electrically connected by scraping off the adhesive layer with the provided protrusions.

特許第３５６３８８２号公報Japanese Patent No. 3563882

しかしながら、上述の特許文献１に開示された技術は、ビス止め等によって各部材を連結する構成に比べて小型化を図ることが可能であるものの、各部材の連結（接着）と電気的な導通を個別の手段で行う必要があり、製造工程が複雑化する虞がある。   However, although the technique disclosed in Patent Document 1 described above can be reduced in size as compared with the configuration in which the members are connected by screws or the like, the connection (adhesion) of the members and electrical continuity are possible. There is a risk that the manufacturing process becomes complicated.

本発明は上記事情に鑑みてなされたもので、先端部を大型化させることなく簡単な構成により、先端部本体と先端関節駒との連結及び電気的な導通を実現することができる内視鏡を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an endoscope capable of realizing connection and electrical conduction between the tip body and the tip joint piece with a simple configuration without increasing the size of the tip. The purpose is to provide.

本発明の一態様による内視鏡は、挿入部の先端側に設けられた金属製の先端部本体と、前記挿入部の湾曲部を構成する複数の関節駒の先端に位置し、先端側が前記先端部本体の基端側の外周に嵌合する筒状の先端関節駒と、前記先端関節駒の先端側の周壁に設けた切り欠きによって形成され、前記先端関節駒を前記先端部本体に係止するとともに、当該係止時の弾性変形による付勢力によって前記先端関節駒を前記先端部本体と電気的に接続する係止部と、を備え、前記係止部は、前記先端関節駒の周壁の一部を切り欠いて形成された係止孔部であり、前記先端部本体は、前記係止孔部の内周に圧接された状態にて係合可能な突出部を有するものである。 An endoscope according to an aspect of the present invention is located at a distal end of a metal distal end main body provided on a distal end side of an insertion portion and a plurality of joint pieces constituting a bending portion of the insertion portion, and the distal end side is the distal end. Formed by a cylindrical tip joint piece that fits to the outer periphery of the proximal end of the body part, and a notch provided in the peripheral wall on the distal end side of the tip joint piece, and locks the distal joint piece to the tip body. And a locking portion that electrically connects the distal joint piece with the distal end body by an urging force caused by elastic deformation at the time of locking, and the locking portion is a part of a peripheral wall of the distal joint piece. The tip end body has a protruding portion that can be engaged with the inner periphery of the locking hole .

本発明の内視鏡によれば、先端部を大型化させることなく簡単な構成により、先端部本体と先端関節駒との連結及び電気的な導通を実現することができる。   According to the endoscope of the present invention, it is possible to realize connection and electrical conduction between the distal end portion main body and the distal end joint piece with a simple configuration without increasing the size of the distal end portion.

本発明の第１の実施形態に係わり、内視鏡の全体図1 is an overall view of an endoscope according to a first embodiment of the present invention. 同上、内視鏡における高周波電流の帰還回路の概略構成図Same as above, schematic configuration diagram of high-frequency current feedback circuit in endoscope 同上、挿入部の端面図Same as above, end view of insertion section 同上、図３のIV−IV線に沿う挿入部の先端側の要部断面図Same as above, main part sectional view of the distal end side of the insertion portion along the line IV-IV in FIG. 同上、図３のＶ−Ｖ線に沿う挿入部の先端側の要部断面図Same as above, main part sectional view of the distal end side of the insertion portion along the line VV of FIG. 同上、図３のVI−VI線に沿う挿入部の先端側の要部断面図Same as above, cross-sectional view of the main part on the distal end side of the insertion section along the line VI-VI in FIG. 同上、挿入部の先端側の要部を示す分解斜視図Same as above, exploded perspective view showing the main part on the distal end side of the insertion part 同上、先端カバーを取り外した状態で挿入部の先端側の要部を示す斜視図The perspective view which shows the principal part of the front end side of an insertion part in the state which removed the front-end | tip cover same as the above. 同上、挿入部の先端側の要部を示す斜視断面図Same as above, perspective cross-sectional view showing the main part of the distal end side of the insertion part 本発明の第２の実施形態に係わり、挿入部の先端側の要部を示す分解斜視図The disassembled perspective view which shows the principal part at the front end side of an insertion part in connection with the 2nd Embodiment of this invention. 同上、先端カバーを取り外した状態で挿入部の先端側の要部を示す斜視図The perspective view which shows the principal part of the front end side of an insertion part in the state which removed the front-end | tip cover same as the above. 同上、挿入部の先端側の要部を示す斜視断面図Same as above, perspective cross-sectional view showing the main part of the distal end side of the insertion part

以下、図面を参照して本発明の形態を説明する。図１乃至図９は本発明の第１の実施形態に係わり、図１は内視鏡の全体図、図２は内視鏡における高周波電流の帰還回路の概略構成図、図３は挿入部の端面図、図４は図３のIV−IV線に沿う挿入部の先端側の要部断面図、図５は図３のＶ−Ｖ線に沿う挿入部の先端側の要部断面図、図６は図３のVI−VI線に沿う挿入部の先端側の要部断面図、図７は挿入部の先端側の要部を示す分解斜視図、図８は先端カバーを取り外した状態で挿入部の先端側の要部を示す斜視図、図９は挿入部の先端側の要部を示す斜視断面図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 9 relate to a first embodiment of the present invention, FIG. 1 is an overall view of an endoscope, FIG. 2 is a schematic configuration diagram of a high-frequency current feedback circuit in the endoscope, and FIG. 4 is a cross-sectional view of the main portion of the insertion portion along the line IV-IV in FIG. 3, and FIG. 5 is a cross-sectional view of the main portion of the insertion portion along the line V-V in FIG. 6 is a cross-sectional view of the main portion of the insertion portion along the VI-VI line of FIG. 3, FIG. 7 is an exploded perspective view showing the main portion of the insertion portion, and FIG. 8 is inserted with the tip cover removed. FIG. 9 is a perspective sectional view showing the main part on the distal end side of the insertion part.

図１に示す内視鏡１は、細長な管状に形成されて体腔内等の被検体内に挿入される挿入部２と、挿入部２の基端側に連設された操作部３と、操作部３の側部から延出されるユニバーサルコード４と、ユニバーサルコード４の先端側に配設されたコネクタ５とを主要構成として備えている。この内視鏡１は、ユニバーサルコード４の先端のコネクタ５を介して、周知の各種装置、例えば、信号処理装置（ビデオプロセッサ）、光源装置、送気送水装置、その他の周辺装置に接続され、内視鏡１と、この内視鏡１に接続される各種装置群により、内視鏡システムが構成される。   An endoscope 1 shown in FIG. 1 includes an insertion portion 2 that is formed into an elongated tubular shape and is inserted into a subject such as a body cavity, and an operation portion 3 that is connected to the proximal end side of the insertion portion 2. A universal cord 4 extending from the side of the operation unit 3 and a connector 5 disposed on the distal end side of the universal cord 4 are provided as main components. The endoscope 1 is connected to various known devices such as a signal processing device (video processor), a light source device, an air / water supply device, and other peripheral devices via a connector 5 at the tip of the universal cord 4. An endoscope system is configured by the endoscope 1 and various device groups connected to the endoscope 1.

本実施形態の挿入部２は、先端側から順に、先端部６と、この先端部６の基端側において湾曲可能な湾曲部８と、この湾曲部８の基端側に連設された長尺な可撓管部９とによって構成されている。   The insertion portion 2 of the present embodiment includes, in order from the distal end side, a distal end portion 6, a bending portion 8 that can be bent on the proximal end side of the distal end portion 6, and a length that is connected to the proximal end side of the bending portion 8. It is comprised by the long flexible tube part 9. FIG.

操作部３は、可撓管部９の基端側を覆って可撓管部９と接続される折れ止め部３ａと、この折れ止め部３ａに連設され、使用者が内視鏡１を使用するときに把持する把持部３ｂとを有している。把持部３ｂの上端側には、各種の操作部材が配設され、把持部３ｂの下端側には、鉗子等の処置具を体腔内に導くための処置具挿入口１１等が設けられている。   The operation unit 3 covers the proximal end side of the flexible tube unit 9 and is connected to the bending tube unit 9 and is connected to the bending unit 3a. It has a gripping part 3b that grips when it is used. Various operation members are disposed on the upper end side of the grasping portion 3b, and a treatment instrument insertion port 11 for guiding a treatment instrument such as forceps into the body cavity is provided on the lower end side of the grasping portion 3b. .

ここで、操作部３には、操作部材として、上述の湾曲部８の湾曲操作を行う湾曲操作ノブ１２が設けられている。湾曲部８は、この湾曲操作ノブ１２への操作入力により、挿入部２内に全長に渡って挿通される湾曲操作用のワイヤ４０（図２，４参照）が牽引・弛緩されることにより、例えば、上下及び左右の４方向に湾曲自在となっている。また、操作部３には、操作部材として、送気送水操作又は吸引操作、撮像、照明等の各対応する操作を行うための複数の操作釦１３等が設けられている。   Here, the operation section 3 is provided with a bending operation knob 12 for performing the bending operation of the bending section 8 as an operation member. The bending portion 8 is pulled and relaxed by a bending operation wire 40 (see FIGS. 2 and 4) inserted through the entire length of the insertion portion 2 by an operation input to the bending operation knob 12. For example, it can be bent in four directions, up and down and left and right. The operation unit 3 is provided with a plurality of operation buttons 13 and the like as operation members for performing corresponding operations such as air / water supply operation or suction operation, imaging, illumination, and the like.

ユニバーサルコード４は、例えば、挿入部２の先端から湾曲部８及び可撓管部９の内部を挿通して操作部３に至り、さらに操作部３から延出する各種信号線等を内部に挿通するとともに、光源装置（図示せず）に接続されるライトガイドを挿通し、さらに送気送水装置（図示せず）に接続される送気送水用チューブを挿通する複合ケーブルである。このユニバーサルコード４の先端側端部には、外部装置である光源装置に着脱自在に接続可能な光源接続部５ａと、外部装置である画像処理装置に着脱自在な画像処理装置接続部５ｂとを備えたコネクタ５が設けられている。さらに、このコネクタ５には、内視鏡１の内部に設けられている金属に対して電気的に導通する高周波端子５ｃが設けられており、この高周波端子５ｃには高周波電源に帰還するコードが接続されるようになっている。   For example, the universal cord 4 is inserted from the distal end of the insertion portion 2 through the bending portion 8 and the inside of the flexible tube portion 9 to the operation portion 3, and further, various signal lines extending from the operation portion 3 are inserted therein. In addition, the composite cable is inserted through a light guide connected to a light source device (not shown) and further inserted into an air / water supply tube connected to an air / water supply device (not shown). A light source connection portion 5a that can be detachably connected to a light source device that is an external device and an image processing device connection portion 5b that is detachable to an image processing device that is an external device are provided at the end of the universal cord 4. A provided connector 5 is provided. Further, the connector 5 is provided with a high frequency terminal 5c that is electrically connected to a metal provided in the endoscope 1, and a cord that returns to the high frequency power source is provided in the high frequency terminal 5c. Connected.

次に、図３乃至図６を参照し、挿入部２の先端側の内部構成について具体的に説明する。   Next, the internal configuration on the distal end side of the insertion portion 2 will be specifically described with reference to FIGS. 3 to 6.

挿入部２先端の先端部６は、硬質な金属部材で構成された先端部本体２０と、この先端部本体２０の先端側に冠設する硬質な樹脂部材で構成された先端カバー２１と、を有して構成されている。これら先端部本体２０及び先端カバー２１には、挿入軸Ｏ方向に貫通する複数の孔部２０ａ，２１ａが設けられている（図７，８参照）。そして、これら各孔部２０ａ，２１ａの該当する各部位に各種光学部材やチューブ等が保持或いは連結等されることにより、先端部６には、被検体内を照明するための照明光学系２４や被検体を撮像するための撮像光学系２５等が設けられるとともに、鉗子等の処置具が導出される処置具挿通チャンネル２６や撮像光学系２５に向けて流体を供給する送気送水ノズル２７等が形成されている。   The distal end portion 6 at the distal end of the insertion portion 2 includes a distal end portion main body 20 composed of a hard metal member and a distal end cover 21 composed of a hard resin member that is provided on the distal end side of the distal end portion main body 20. It is configured. The distal end body 20 and the distal end cover 21 are provided with a plurality of holes 20a and 21a penetrating in the insertion axis O direction (see FIGS. 7 and 8). Various optical members, tubes, and the like are held or connected to the corresponding portions of the holes 20a and 21a, so that the distal end portion 6 has an illumination optical system 24 for illuminating the inside of the subject. An imaging optical system 25 for imaging a subject is provided, and a treatment instrument insertion channel 26 from which a treatment instrument such as forceps is led out, an air supply / water supply nozzle 27 that supplies fluid toward the imaging optical system 25, and the like. Is formed.

湾曲部８は、挿入軸Ｏ方向に配列された複数の関節駒３０を有する。これら各関節駒３０は、互いに隣接する関節駒３０間において上下或いは左右に対応して挿入軸Ｏ方向に突出する腕部を有し、これら腕部同士の重なった部位がリベット３１を介して回動自在に連結されることにより、上下及び左右の互いに直交する４方向に湾曲自在な湾曲構造体を構成する。   The bending portion 8 has a plurality of joint pieces 30 arranged in the insertion axis O direction. Each of the joint pieces 30 has an arm portion projecting in the direction of the insertion axis O corresponding to the top and bottom or the left and right between the adjacent joint pieces 30, and the overlapping portion of the arm portions is rotated via the rivet 31. By being connected movably, a bending structure that can be bent in four directions perpendicular to each other in the vertical and horizontal directions is formed.

この湾曲構造体を構成する関節駒３０のうち最先端に位置する関節駒（以下、この関節駒を必要に応じて先端関節駒３０Ａと称す）は筒状（より具体的には、例えば円筒状）をなし、この先端関節駒３０Ａには、ワイヤ４０の先端側の一端を取り付け固定するワイヤ固定部３２が設けられている。本実施形態において、ワイヤ固定部３２は、上下及び左右の４方向の湾曲動作用の４本のワイヤ４０に対応して先端関節駒３０Ａの内周側の４箇所に設けられている。ワイヤ固定部３２に先端が固定された各ワイヤ４０は、複数の関節駒３０の内周側にそれぞれ設けられた環状のガイドリング３３内を挿通されている。また、各ワイヤ４０の末端は、先端関節駒３０Ａ内において上下、左右に対向するペア毎に、操作部３の湾曲操作ノブ１２に連結されたスプロケット２８に巻回されている（図２参照）。各スプロケット２８はフレーム２９から突出する回転軸２９ａに回動自在に支持されており、これにより、湾曲操作ノブ１２によって４本のワイヤ４０の何れかが牽引操作されると、湾曲部８が上下及び左右の何れかの方向に湾曲動作する。なお、説明を簡略化するため、図２には、例えば、湾曲部８を上下方向に湾曲動作させるスプロケット２８のみを図示している。   The joint piece located at the forefront of the joint pieces 30 constituting this curved structure (hereinafter, this joint piece will be referred to as the tip joint piece 30A as necessary) is cylindrical (more specifically, for example, cylindrical. The distal joint piece 30A is provided with a wire fixing portion 32 for attaching and fixing one end of the wire 40 on the distal end side. In the present embodiment, the wire fixing portions 32 are provided at four locations on the inner peripheral side of the tip joint piece 30 </ b> A corresponding to the four wires 40 for up and down and left and right four-direction bending operations. Each wire 40 whose tip is fixed to the wire fixing portion 32 is inserted through an annular guide ring 33 provided on the inner peripheral side of the plurality of joint pieces 30. In addition, the end of each wire 40 is wound around a sprocket 28 connected to the bending operation knob 12 of the operation unit 3 for each pair facing vertically and horizontally in the tip joint piece 30A (see FIG. 2). . Each sprocket 28 is rotatably supported by a rotating shaft 29a protruding from the frame 29. With this, when one of the four wires 40 is pulled by the bending operation knob 12, the bending portion 8 moves up and down. And a bending operation in either the left or right direction. For simplification of explanation, FIG. 2 shows only the sprocket 28 that causes the bending portion 8 to bend in the vertical direction, for example.

ここで、本実施形態において、スプロケット２８及びフレーム２９は、金属等の導電性部材によって構成されている。また、図２に示すように、フレーム２９には、リード線４ａの一端が電気的に接続され、このリード線４ａの他端はユニバーサルコード４内を経て高周波端子５ｃに電気的に接続されている。これにより、先端関節駒３０Ａ、ワイヤ４０、スプロケット２８、フレーム２９、リード線４ａ、高周波端子５ｃ及び高周波電源（図示せず）が電気的に接続され、極めてインピーダンスの低い帰還回路が形成される。   Here, in the present embodiment, the sprocket 28 and the frame 29 are made of a conductive member such as metal. As shown in FIG. 2, one end of a lead wire 4a is electrically connected to the frame 29, and the other end of the lead wire 4a is electrically connected to the high frequency terminal 5c through the universal cord 4. Yes. As a result, the tip joint piece 30A, the wire 40, the sprocket 28, the frame 29, the lead wire 4a, the high frequency terminal 5c and the high frequency power source (not shown) are electrically connected to form a feedback circuit having a very low impedance.

また、湾曲部８よりも基端側を構成する可撓管部９は、例えば、弾性を有する帯状の薄板材を螺旋状に巻回して形成した螺旋管３５を有する。   Moreover, the flexible tube part 9 which comprises a base end side rather than the curved part 8 has the helical tube 35 formed, for example by winding the strip-shaped thin board | plate material which has elasticity helically.

この螺旋管３５、及び、湾曲部８の湾曲構造体を構成する各関節駒３０（３０Ａ）の外周には、例えば、ステンレス線を編み込んで管状に形成した網状管３６が被覆され、さらに、網状管３６の外周には、樹脂部材またはゴム部材等で形成された管状の外皮チューブ３７が被覆されている。そして、このように、各関節駒３０及び螺旋管３５が一連の網状管３６によって被覆されることにより、湾曲部８及び可撓管部９は、内部において先端側から基端側までの電気的な導通が図られている。さらに、網状管３６が外皮チューブ３７によって被覆されることにより、湾曲部８及び可撓管部９は、外部と電気的に絶縁されている。   The outer periphery of each spiral piece 35 and each joint piece 30 (30A) constituting the bending structure of the bending portion 8 is covered with, for example, a net-like pipe 36 formed in a tubular shape by weaving stainless wire. The outer periphery of the tube 36 is covered with a tubular outer tube 37 formed of a resin member or a rubber member. In this way, each joint piece 30 and the spiral tube 35 are covered with a series of mesh tubes 36, whereby the bending portion 8 and the flexible tube portion 9 are electrically connected from the distal end side to the proximal end side. Continuity is achieved. Furthermore, the mesh tube 36 is covered with the outer tube 37, so that the bending portion 8 and the flexible tube portion 9 are electrically insulated from the outside.

ここで、上述のように構成された先端部６と湾曲部８との連結は、例えば、図４及び図７乃至図９に示すように、先端部本体２０の基端側に先端関節駒３０Ａの先端側が外嵌して係合することによって実現される。   Here, the distal end portion 6 and the bending portion 8 configured as described above are connected to the distal end joint piece 30A on the proximal end side of the distal end portion main body 20 as shown in FIGS. 4 and 7 to 9, for example. This is realized by engaging and engaging the front end side.

具体的に説明すると、先端関節駒３０Ａには、当該先端関節駒３０Ａの先端から挿入軸Ｏ方向に延在する第１の切り込み４５ａと、第１の切り込みの基端から挿入軸Ｏに直交する方向に延在する第２の切り込み４５ｂと、がレーザ加工等によって設けられている。そして、これらの切り込み４５ａ，４５ｂの内側領域が内径方向に折曲されることにより、先端関節駒３０Ａには、係止部としての係止爪部４６が形成されている。ここで、本実施形態において、内側領域における２辺のなす角度が鋭角となるよう、第１の切り込み４５ａは挿入軸Ｏに対して所定角度傾斜されており、これにより、係止爪部４６は、基端側になるほど、先端関節駒３０Ａの内径方向への突出量が大きくなるよう設定されている。   More specifically, the distal joint piece 30A has a first cut 45a extending from the distal end of the distal joint piece 30A in the direction of the insertion axis O, and is orthogonal to the insertion axis O from the proximal end of the first cut. A second cut 45b extending in the direction is provided by laser processing or the like. And the latching claw part 46 as a latching | locking part is formed in 30 A of front-end | tip joint pieces by bending the inner area | region of these notches 45a and 45b to an internal diameter direction. Here, in the present embodiment, the first cut 45a is inclined by a predetermined angle with respect to the insertion axis O so that the angle formed by the two sides in the inner region is an acute angle. The protrusion amount in the inner diameter direction of the distal joint piece 30A is set to be larger toward the proximal end side.

一方、先端部本体２０の基端側外周の中途には、挿入方向に延在するキー溝４７が設けられている。本実施形態において、キー溝４７は、その基端側が係止爪部４６と係合可能な係合部４７ａによって閉塞され、かつ、その深さが係止爪部４６の最大突出長さよりも浅くなるよう設定された有底の溝部によって構成されている。   On the other hand, a keyway 47 extending in the insertion direction is provided in the middle of the outer periphery on the proximal end side of the distal end body 20. In the present embodiment, the key groove 47 is closed at the base end side by the engaging portion 47 a that can be engaged with the locking claw portion 46, and the depth is shallower than the maximum protruding length of the locking claw portion 46. It is comprised by the bottomed groove part set so that it might become.

そして、このようなキー溝４７を有する先端部本体２０に対して先端関節駒３０Ａが外嵌されると、当該先端関節駒３０Ａに設けられた係止爪部４６は、弾性変形しながら係合部４７ａを乗り越えてキー溝４７内に挿入される（図８参照）。そして、図４，９に示すように、キー溝４７内に挿入された係止爪部４６は、係合部４７ａと係合することにより、先端部本体２０と先端関節駒３０Ａとの連結状態を保持する。   When the tip joint piece 30A is externally fitted to the tip body 20 having such a key groove 47, the locking claw portion 46 provided on the tip joint piece 30A engages while elastically deforming. It gets over the portion 47a and is inserted into the key groove 47 (see FIG. 8). As shown in FIGS. 4 and 9, the locking claw portion 46 inserted into the key groove 47 is engaged with the engaging portion 47a, whereby the distal end body 20 and the distal joint piece 30A are connected. Hold.

加えて、上述のようにキー溝４７の深さは係止爪部４６の最大突出長さよりも浅く設定されているため、係止爪部４６は、所定に弾性変形されたままの状態でキー溝４７内に保持されている。従って、係止爪部４６は、弾性変形による付勢力によってキー溝４７の底部に常に圧接されることとなり，この圧接により、先端部本体２０と先端関節駒３０Ａとの間の電気的な導通を実現する。これにより、先端部本体２０は、先端関節駒３０Ａを介してワイヤ４０等に導通され、その結果、先端部本体２０から高周波端子５ｃまでの好適な導通が実現する。   In addition, since the depth of the key groove 47 is set to be shallower than the maximum protruding length of the locking claw portion 46 as described above, the locking claw portion 46 remains in a predetermined elastically deformed state. It is held in the groove 47. Therefore, the latching claw portion 46 is always pressed against the bottom of the key groove 47 by the urging force due to elastic deformation, and this pressure contact establishes electrical continuity between the tip body 20 and the tip joint piece 30A. Realize. Thereby, the front-end | tip part main body 20 is conduct | electrically_connected to the wire 40 grade | etc., Via the front-end | tip joint piece 30A, As a result, suitable conduction | electrical_connection from the front-end | tip part main body 20 to the high frequency terminal 5c is implement | achieved.

なお、先端関節駒３０Ａと連結された後の先端部本体２０には、湾曲部８側から延出する外皮チューブ３７が被覆され、この外皮チューブ３７の先端部分が糸巻き接着部３８によって固定されている。   The distal end main body 20 after being connected to the distal joint piece 30A is covered with an outer tube 37 extending from the curved portion 8 side, and the distal end portion of the outer tube 37 is fixed by a bobbin adhering portion 38. Yes.

このような実施形態によれば、先端側の周壁に設けた第１，第２の切り欠き４５，４６を内径方向に折曲することによって先端関節駒３０Ａに係止爪部４６を形成するとともに、この係止爪部４６の内径方向の突出長さよりも浅いキー溝４７を先端部本体２０に設け、先端関節駒３０Ａと先端部本体２０との嵌合に際し、係止爪部４６をキー溝４７内に挿入して弾性変形した状態にて係合させることにより、先端部６を大型化させることなく簡単な構成により、先端部本体２０と先端関節駒３０Ａとの連結及び電気的な導通を実現することができる。   According to such an embodiment, the first and second notches 45 and 46 provided on the peripheral wall on the distal end side are bent in the inner diameter direction to form the locking claw 46 on the distal joint piece 30A. A key groove 47 shallower than the protruding length in the inner diameter direction of the locking claw portion 46 is provided in the distal end body 20, and when the distal joint piece 30 </ b> A and the distal end body 20 are fitted, the locking claw portion 46 is inserted into the key groove. By inserting into 47 and engaging in an elastically deformed state, the tip portion main body 20 and the tip joint piece 30A can be connected and electrically connected with a simple configuration without increasing the size of the tip portion 6. Can be realized.

すなわち、先端関節駒３０Ａに形成した係止爪部４６を用いて先端部本体２０と先端関節駒３０Ａとの連結状態を保持する構成としたことにより、ビス等の別部材が不要となり、ビス止め等に比べて構成を簡素化することができる。しかも、ビスを螺合するためのねじ穴等を先端部本体２０に設ける必要がなく、キー溝４７の形成は僅かなスペースで事足りるので、先端部本体２０等の小型化を容易に実現することができる。   That is, since the connection state between the tip body 20 and the tip joint piece 30A is maintained using the locking claw portion 46 formed on the tip joint piece 30A, a separate member such as a screw becomes unnecessary, and the screw fixing The configuration can be simplified compared to the above. In addition, it is not necessary to provide a screw hole or the like for screwing the screw in the distal end portion main body 20, and the key groove 47 can be formed with a small space, so that the distal end portion main body 20 and the like can be easily reduced in size. Can do.

また、キー溝４７の深さを係止爪部４６の最大突出長さよりも浅く設定し、係止爪部４６をキー溝４７の底部に弾性的に圧接させることにより、先端部本体２０と先端関節駒３０Ａとの連結状態を保持するための係止機構によって、これらの部材間の電気的な導通についても的確に実現することができる。   Further, by setting the depth of the key groove 47 to be shallower than the maximum protruding length of the locking claw portion 46 and elastically pressing the locking claw portion 46 to the bottom portion of the key groove 47, The electrical continuity between these members can be accurately realized by the locking mechanism for maintaining the connection state with the joint piece 30A.

なお、上述の本実施形態においては、係止爪部４６及びキー溝４７をそれぞれ１箇所のみに設けた一例について説明したが、これらを２箇所以上に設けることも可能であることは勿論である。   In the above-described embodiment, an example in which the locking claw portion 46 and the key groove 47 are provided at only one place has been described, but it is needless to say that these can be provided at two or more places. .

次に、図１０乃至図１２は本発明の第２の実施形態に係わり、図１０は挿入部の先端側の要部を示す分解斜視図、図１１は先端カバーを取り外した状態で挿入部の先端側の要部を示す斜視図、図１２は挿入部の先端側の要部を示す斜視断面図である。なお、本実施形態は、主として係止部の構成が上述の第１の実施形態に対して異なる。その他、上述の第１の実施形態と同様の構成については、同符号を付して説明を省略する。   Next, FIGS. 10 to 12 relate to a second embodiment of the present invention, FIG. 10 is an exploded perspective view showing a main part on the distal end side of the insertion portion, and FIG. 11 is a view of the insertion portion with the distal end cover removed. FIG. 12 is a perspective sectional view showing the main part on the distal end side of the insertion part. In addition, this embodiment mainly differs in the structure of the latching | locking part with respect to the above-mentioned 1st Embodiment. In addition, about the structure similar to the above-mentioned 1st Embodiment, a same sign is attached | subjected and description is abbreviate | omitted.

図１０乃至図１２に示すように、先端関節駒３０Ａには、当該先端関節駒３０Ａの先端側の周壁を貫通する２つの係止孔部５０が設けられている。本実施形態において，これら係止孔部５０は、例えば、レーザ加工等によって先端関節駒３０Ａの周壁を切り欠くことによって形成された丸孔状の貫通孔によって構成されている。   As shown in FIGS. 10 to 12, the distal joint piece 30A is provided with two locking holes 50 penetrating the peripheral wall on the distal end side of the distal joint piece 30A. In the present embodiment, these locking hole portions 50 are configured by, for example, round hole-shaped through holes formed by cutting out the peripheral wall of the tip joint piece 30A by laser processing or the like.

また、先端関節駒３０Ａには、各係止孔部５０を先端側に開放するスリットとして、第１のスリット５１がレーザ加工等によって設けられている。さらに、先端関節駒３０Ａにおいて、各係止孔部５０の近傍（具体的には、係止孔部５０の両側に近接する位置）には、スリットとしての第２のスリット５２がレーザ加工等によって設けられている。   Further, the first joint piece 30A is provided with a first slit 51 by laser processing or the like as a slit that opens each locking hole 50 to the distal end side. Further, in the tip joint piece 30A, a second slit 52 as a slit is formed by laser processing or the like in the vicinity of each locking hole 50 (specifically, a position close to both sides of the locking hole 50). Is provided.

一方、先端部本体２０の基端側外周の中途において、係止孔部５０に対応する位置には、突出部５５が設けられている。この突出部５５は、例えば、係止孔部５０の内周と相似形状をなし、当該係合孔部５０に係合可能な突起によって構成されている。より具体的には、本実施形態の突出部５５は、例えば、円形に形成された係止孔部５０の内径よりもやや大径となる外周面を備えた略円柱状をなし、その突端面の基端側に傾斜面５５ａを有する。   On the other hand, a protrusion 55 is provided at a position corresponding to the locking hole 50 in the middle of the outer periphery on the proximal end side of the distal end main body 20. For example, the protrusion 55 has a shape similar to the inner periphery of the locking hole 50 and is configured by a protrusion that can be engaged with the engagement hole 50. More specifically, the projecting portion 55 of the present embodiment has a substantially cylindrical shape with an outer peripheral surface that is slightly larger than the inner diameter of the circularly formed locking hole portion 50, for example, and its protruding end surface. An inclined surface 55a is provided on the base end side.

このような構成において、先端部本体２０に対して先端関節駒３０Ａが外嵌されると、当該先端関節駒３０Ａの周壁の一部は、弾性変形しながら突出部５５を乗り越え、係止孔部５０内に突出部５５を係合させる。そして、この係合によって、係止孔部５０は、先端部本体２０と先端関節駒３０Ａとの連結状態を保持する。加えて、突出部５５の外周の一部が係止孔部５０の内周よりも大きい相似形状をなしているため、当該部位において、係止孔部５０は拡開方向に弾性変形された状態にて突出部５５に圧接され、この圧接により、係止孔部５０は、先端部本体２０と先端関節駒３０Ａとの間の電気的な導通を実現する。この場合において、第１のスリット５１及び第２のスリット５２を有することにより、係止孔部５０を容易に弾性変形させることができる。また、突出部５５の基端側に傾斜面５５ａを有することにより、先端関節駒３０Ａの周壁は、突出部５５を容易に乗り越えることが可能となる。   In such a configuration, when the tip joint piece 30A is externally fitted to the tip portion main body 20, a part of the peripheral wall of the tip joint piece 30A gets over the protrusion 55 while being elastically deformed, and the locking hole portion The protrusion 55 is engaged in 50. And by this engagement, the locking hole part 50 maintains the connection state of the front-end | tip part main body 20 and the front-end | tip joint piece 30A. In addition, since a part of the outer periphery of the protruding portion 55 has a similar shape larger than the inner periphery of the locking hole portion 50, the locking hole portion 50 is elastically deformed in the expanding direction at the portion. The locking hole 50 realizes electrical continuity between the distal end body 20 and the distal joint piece 30A. In this case, the locking hole 50 can be easily elastically deformed by having the first slit 51 and the second slit 52. Further, by providing the inclined surface 55a on the proximal end side of the protruding portion 55, the peripheral wall of the distal joint piece 30A can easily get over the protruding portion 55.

このような実施形態によれば、上述の第１の実施形態と略同様の効果を奏することができる。なお、上述の本実施形態においては、係止孔部５０及び突出部５５をそれぞれ２箇所設けた一例について説明したが、これらを１箇所或いは３箇所以上に設けることも可能であることは勿論である。また、係止孔部５０単独で所望の弾性変形が可能である場合には、第１のスリット５１及び第２のスリット５２を適宜省略することも可能である。   According to such an embodiment, substantially the same effects as those of the first embodiment described above can be achieved. In the above-described embodiment, an example in which the locking hole portion 50 and the protruding portion 55 are provided at two locations has been described. However, it is of course possible to provide these at one location or three or more locations. is there. In addition, when desired elastic deformation is possible with the locking hole 50 alone, the first slit 51 and the second slit 52 can be omitted as appropriate.

なお、本発明は、以上説明した各実施形態に限定されることなく、種々の変形や変更が可能であり、それらも本発明の技術的範囲内である。また、上述の各実施形態の構成を適宜組み合わせてもよいことは勿論である。   In addition, this invention is not limited to each embodiment described above, A various deformation | transformation and change are possible, and they are also in the technical scope of this invention. Of course, the configurations of the above-described embodiments may be appropriately combined.

１…内視鏡、２…挿入部、３…操作部、３ａ…折れ止め部、３ｂ…把持部、４…ユニバーサルコード、５…コネクタ、５ｃ…高周波端子、６…先端部、８…湾曲部、９…可撓管部、１１…処置具挿入口、１２…湾曲操作ノブ、１３…操作釦、２０…先端部本体、２０ａ，２１ａ…孔部、２１…先端カバー、２５…撮像光学系、２６…処置具挿通チャンネル、２８…スプロケット、２９…フレーム、３０…関節駒、３０Ａ…先端関節駒、３１…リベット、３２…ワイヤ固定部、３３…ガイドリング、３５…螺旋管、３６…網状管、３７…外皮チューブ、３８…接着部、４０…ワイヤ、４６…係止爪部、４７…キー溝、４７ａ…係合部、５０…係止孔部、５１…第１のスリット（スリット）、５２…第２のスリット（スリット）、５５…突出部、５５ａ…傾斜面   DESCRIPTION OF SYMBOLS 1 ... Endoscope, 2 ... Insertion part, 3 ... Operation part, 3a ... Bending part, 3b ... Gripping part, 4 ... Universal cord, 5 ... Connector, 5c ... High frequency terminal, 6 ... Tip part, 8 ... Bending part , 9 ... Flexible tube portion, 11 ... Treatment instrument insertion port, 12 ... Bending operation knob, 13 ... Operation button, 20 ... Tip body, 20a, 21a ... Hole, 21 ... Tip cover, 25 ... Imaging optical system, 26 ... Treatment instrument insertion channel, 28 ... Sprocket, 29 ... Frame, 30 ... Joint piece, 30A ... Tip joint piece, 31 ... Rivet, 32 ... Wire fixing part, 33 ... Guide ring, 35 ... Spiral tube, 36 ... Reticulated tube 37 ... outer tube, 38 ... adhesive part, 40 ... wire, 46 ... locking claw part, 47 ... key groove, 47a ... engaging part, 50 ... locking hole part, 51 ... first slit (slit), 52 ... second slit (slit), 55 ... projection, 5a ... inclined surface

Claims (4)

挿入部の先端側に設けられた金属製の先端部本体と、
前記挿入部の湾曲部を構成する複数の関節駒の先端に位置し、先端側が前記先端部本体の基端側の外周に嵌合する筒状の先端関節駒と、
前記先端関節駒の先端側の周壁に設けた切り欠きによって形成され、前記先端関節駒を前記先端部本体に係止するとともに、当該係止時の弾性変形による付勢力によって前記先端関節駒を前記先端部本体と電気的に接続する係止部と、を備え、
前記係止部は、前記先端関節駒の周壁の一部を切り欠いて形成された係止孔部であり、
前記先端部本体は、前記係止孔部の内周に圧接された状態にて係合可能な突出部を有することを特徴とする内視鏡。 A metal tip body provided on the tip side of the insertion portion;
A cylindrical distal joint piece that is located at the distal ends of a plurality of joint pieces constituting the bending portion of the insertion portion, and whose distal end side is fitted to the outer periphery of the proximal end side of the distal end portion main body,
The tip joint piece is formed by a notch provided in the peripheral wall on the tip side of the tip joint piece, and the tip joint piece is locked to the tip portion main body, and the tip joint piece is moved to the tip by an urging force due to elastic deformation at the time of locking. A locking portion that is electrically connected to the main body ,
The locking portion is a locking hole formed by cutting out a part of the peripheral wall of the tip joint piece,
The endoscope according to claim 1, wherein the distal end portion main body has a protruding portion that can be engaged in a state of being pressed against an inner periphery of the locking hole portion . 前記突出部は、外周の少なくとも一部が前記係止孔部の内周よりも大きい相似形状をなしていることを特徴とする請求項１に記載の内視鏡。  The endoscope according to claim 1, wherein the protruding portion has a similar shape in which at least a part of an outer periphery is larger than an inner periphery of the locking hole portion. 前記先端関節駒は、前記係止孔部を先端側に開放するスリットを有することを特徴とする請求項２に記載の内視鏡。  The endoscope according to claim 2, wherein the distal joint piece has a slit that opens the locking hole to the distal end side. 前記先端関節駒は、前記係止孔部の近傍にスリットを有することを特徴とする請求項２に記載の内視鏡。  The endoscope according to claim 2, wherein the distal joint piece has a slit in the vicinity of the locking hole.
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