JP2005348896A - Endoscope - Google Patents

Endoscope Download PDF

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JP2005348896A
JP2005348896A JP2004171722A JP2004171722A JP2005348896A JP 2005348896 A JP2005348896 A JP 2005348896A JP 2004171722 A JP2004171722 A JP 2004171722A JP 2004171722 A JP2004171722 A JP 2004171722A JP 2005348896 A JP2005348896 A JP 2005348896A
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wire
lever
distal end
guide hole
treatment instrument
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JP4495527B2 (en
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Kazuhiko Hino
和彦 樋野
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Fujinon Corp
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Fujinon Corp
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00098—Deflecting means for inserted tools

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  • Heart & Thoracic Surgery (AREA)
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  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)
  • Endoscopes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endoscope capable of improving the operability of a wire at a low cost without performing any complicated machining. <P>SOLUTION: This endoscope which has a treatment appliance erection stand 15 for changing the direction of the treatment appliance in a distal end 2a, is provided with the wire 40 for operating the treatment appliance erection stand 15, and the erection angle of the treatment appliance erection stand 15 is adjusted by extending/retracting the wire 40. A guide hole 50 into which the wire 40 is inserted is provided in the distal end 2a, the distal end of a tube 51 in which the wire 40 is inserted is connected to the guide hole 50, a coil spring 53 is provided inside the distal end of the tube 51, and the inside diameter of the guide hole 50 is formed larger than the inside diameter of the coil spring 53. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は，先端部から突出される処置具類の突出方向を変えるための処置具起立台を有する内視鏡に関する。   The present invention relates to an endoscope having a treatment instrument stand for changing the protruding direction of treatment instruments projected from a distal end portion.

一般に，医療用の内視鏡は，患者の体腔内に挿入される細長い挿入部と，操作部とによって構成されている。挿入部の先端部には撮像手段や照明手段が設けられており，さらに，先端部から鉗子等の処置具を突出させ，体腔内において様々な処置を行うことができる構成になっている。このような処置具は，挿入部内に挿通され，先端部側面に設けられた開口から突出されるようになっている。また，先端部において，処置具は開口内部に設けられた処置具起立台によって支持されており，処置具起立台の起立角度を調節することにより，処置具の突出方向を変化させることができる。処置具起立台の角度は，挿入部内に挿通されたワイヤを進退操作することで調節することができる。   In general, a medical endoscope includes an elongated insertion portion that is inserted into a body cavity of a patient and an operation portion. An imaging means and an illumination means are provided at the distal end portion of the insertion portion, and a treatment tool such as a forceps is projected from the distal end portion so that various treatments can be performed in the body cavity. Such a treatment tool is inserted into the insertion portion and protrudes from an opening provided on the side surface of the distal end portion. Further, at the distal end portion, the treatment tool is supported by a treatment tool stand provided inside the opening, and the protruding direction of the treatment tool can be changed by adjusting the standing angle of the treatment tool stand. The angle of the treatment instrument stand can be adjusted by advancing and retracting the wire inserted into the insertion portion.

従来，このような内視鏡として，例えば，先端部の基端側からワイヤを延設し，ワイヤの先端を処置具起立台の側面に取り付けた構成が知られている（例えば，特許文献１参照）。また，処置具起立台の側方に，処置具起立台と一体的に回転するレバーを備え，このレバーにワイヤの先端を取り付けた構成が提案されている（例えば，特許文献２参照）。また，ワイヤをレバー側にガイドするガイド孔を設け，さらにガイド孔の内側の端部にワイヤの逃げ溝を設け，ワイヤがガイド孔の端部と接触しないようにして，ワイヤの操作性を向上させるようにした構成が提案されている（例えば，特許文献３参照）。   Conventionally, as such an endoscope, for example, a configuration in which a wire is extended from a proximal end side of a distal end portion and the distal end of the wire is attached to a side surface of a treatment instrument stand (for example, Patent Document 1) is known. reference). Further, a configuration has been proposed in which a lever that rotates integrally with the treatment instrument stand is provided on the side of the treatment instrument stand, and a wire tip is attached to this lever (see, for example, Patent Document 2). In addition, a guide hole for guiding the wire to the lever side is provided, and a wire escape groove is provided at the inner end of the guide hole, so that the wire does not contact the end of the guide hole, improving the operability of the wire A configuration has been proposed (see, for example, Patent Document 3).

特開平１０−１１８０１４号公報JP-A-10-1118014 特開平８−５６９００号公報JP-A-8-56900 特開２０００−１７５８６４号公報JP 2000-175864 A

しかしながら，従来の内視鏡にあっては，ワイヤがガイド孔の開口端部に接触して，ワイヤの操作性が悪くなる問題や，ワイヤが損傷する問題があった。また，ガイド孔の内側の端部にワイヤの逃げ溝を設けた場合も，逃げ溝の周縁部にワイヤが接触する問題があった。そのような問題を解決するべく，ガイド孔や逃げ溝の周縁部に丸みを付ける加工を施すことが考えられるが，この場合，加工が難しく，高価な部品になってしまう問題があった。   However, the conventional endoscope has a problem that the wire comes into contact with the opening end of the guide hole and the operability of the wire is deteriorated and the wire is damaged. Further, even when a wire escape groove is provided at the inner end of the guide hole, there is a problem that the wire contacts the peripheral edge of the escape groove. In order to solve such a problem, it is conceivable to round the peripheral portion of the guide hole or the escape groove. However, in this case, there is a problem that the machining is difficult and an expensive part is formed.

本発明の目的は，難しい加工を行うことなく，低コストでワイヤの操作性を向上させることができる内視鏡を提供することにある。   The objective of this invention is providing the endoscope which can improve the operativity of a wire at low cost, without performing a difficult process.

上記課題を解決するために，本発明によれば，処置具の方向を変えるための処置具起立台を先端部に備えた内視鏡であって，前記処置具起立台を操作するためのワイヤを備え，前記ワイヤを進退させることにより，前記処置具起立台の起立角度を調節する構成とし，前記先端部に，前記ワイヤを挿通させるガイド孔が設けられ，前記ガイド孔に，前記ワイヤを挿通させるチューブの先端部が接続され，前記チューブの先端部の内面にコイルバネが設けられ，前記ガイド孔の内径は，前記コイルバネの内径より大きく形成されたことを特徴とする，内視鏡が提供される。   In order to solve the above-described problems, according to the present invention, an endoscope having a treatment instrument stand for changing the direction of a treatment instrument at a distal end thereof, the wire for operating the treatment instrument stand And a guide hole through which the wire is inserted is provided at the distal end portion, and the wire is inserted into the guide hole. An endoscope is provided, characterized in that a distal end portion of a tube to be connected is connected, a coil spring is provided on an inner surface of the distal end portion of the tube, and an inner diameter of the guide hole is formed larger than an inner diameter of the coil spring. The

この発明にあっては，前記処置具起立台と一体的に回転するレバーを備え，前記レバーにワイヤの先端が接続された構成としても良い。さらに，前記ガイド孔は，開口端部から内部に向かうに従い径が大きくなるように形成されていることとしても良い。また，前記ワイヤは，前記コイルバネの内面に接触することとしても良い。   In this invention, it is good also as a structure which provided the lever which rotates integrally with the said treatment tool stand, and the front-end | tip of the wire was connected to the said lever. Furthermore, the guide hole may be formed such that the diameter increases from the opening end toward the inside. The wire may be in contact with the inner surface of the coil spring.

本発明によれば，ガイド孔の内径がコイルバネの内径よりも大きくなっているため，ワイヤをガイド孔内で進退させるとき，ワイヤがガイド孔に接触することを防止でき，ワイヤを円滑に進退させることができる。また，チューブの内面に設けたコイルバネにワイヤが接触しても，コイルバネの内面は曲面状であるため，ワイヤの動きが妨げられることは無く，ワイヤを円滑に動かすことができる。従って，ガイド孔の周縁部に丸みを付けるといった難しい加工を行うことなく，低コストでワイヤの操作性を向上させることができる。また，ワイヤが損傷することを防止できる。   According to the present invention, since the inner diameter of the guide hole is larger than the inner diameter of the coil spring, the wire can be prevented from coming into contact with the guide hole when the wire is advanced and retracted in the guide hole, and the wire is smoothly advanced and retracted. be able to. Even if the wire comes into contact with the coil spring provided on the inner surface of the tube, the inner surface of the coil spring is curved, so that the movement of the wire is not hindered and the wire can be moved smoothly. Therefore, the operability of the wire can be improved at a low cost without performing difficult processing such as rounding the peripheral edge of the guide hole. In addition, the wire can be prevented from being damaged.

以下，本発明の実施の形態を，図面を参照しながら説明する。図１に示すように，本発明にかかる内視鏡１は，体腔内に挿入される細長い挿入部２と，挿入部２の基端に接続された操作部３と，操作部３から引出され光源および電源に接続されたコード部４とによって構成されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an endoscope 1 according to the present invention is drawn from an elongated insertion portion 2 to be inserted into a body cavity, an operation portion 3 connected to the proximal end of the insertion portion 2, and the operation portion 3. It is comprised by the code | cord | chord part 4 connected to the light source and the power supply.

挿入部２は，体腔内を観察するための光学系を備えた先端部２ａと，湾曲方向を操作することができる湾曲部２ｂと，操作部３に連結された軟性部２ｃによって構成されている。先端部２ａは湾曲部２ｂの先端に取り付けられており，湾曲部２ｂの基端は軟性部２ｃの先端に連結されている。   The insertion portion 2 is constituted by a distal end portion 2a provided with an optical system for observing the inside of a body cavity, a bending portion 2b capable of operating a bending direction, and a flexible portion 2c connected to the operation portion 3. . The distal end portion 2a is attached to the distal end of the bending portion 2b, and the proximal end of the bending portion 2b is connected to the distal end of the flexible portion 2c.

図２に示すように，先端部２ａは，先端部本体７を備えており，先端部本体７には，絶縁や気密状態確保などの目的でキャップ８が装着されている。   As shown in FIG. 2, the distal end portion 2 a includes a distal end portion main body 7, and a cap 8 is attached to the distal end portion main body 7 for the purpose of ensuring insulation and airtightness.

キャップ８には，開口１４が形成されており，先端部本体７の一側面が露出されている。この開口１４によって露出された先端部本体７の一側面には，観察対象物を照明する照明光を照射する照明窓１０と，観察対象物からの反射光を取入れる観察窓１１とが，先端部本体７の長手方向に沿って並べて設けられている。先端部本体７の側面において，照明窓１０及び観察窓１１の隣には，鉗子等の各種処置具１２を先端部２ａの側方に向けて突出させるための開口１３が形成されている。なお，以下では説明の便宜のため，先端部本体７において照明窓１０，観察窓１１，及び開口１３が形成された側を上側として説明する。   An opening 14 is formed in the cap 8, and one side surface of the tip end body 7 is exposed. On one side surface of the distal end main body 7 exposed by the opening 14, there are an illumination window 10 for irradiating illumination light for illuminating the observation object, and an observation window 11 for taking in reflected light from the observation object. They are arranged side by side along the longitudinal direction of the main part 7. On the side surface of the distal end portion body 7, an opening 13 for projecting various treatment tools 12 such as forceps toward the side of the distal end portion 2 a is formed adjacent to the illumination window 10 and the observation window 11. In the following, for convenience of explanation, the side on which the illumination window 10, the observation window 11, and the opening 13 are formed in the distal end portion body 7 will be described as the upper side.

先端部本体７には，図示はしないが，照明窓１０に接続された光伝送路と，観察窓１１に接続され，撮像素子等を備えた観察光学系とが内蔵されている。光伝送路には，前述した挿入部２の湾曲部２ｂ及び軟性部２ｃ内に挿通された，照明光を供給するためのライトガイドが接続されており，観察光学系には，湾曲部２ｂ及び軟性部２ｃ内に挿通された信号ケーブルが接続されている。   Although not shown, the distal end main body 7 includes an optical transmission path connected to the illumination window 10 and an observation optical system connected to the observation window 11 and provided with an image sensor and the like. A light guide for supplying illumination light, which is inserted into the bending portion 2b and the flexible portion 2c of the insertion portion 2 described above, is connected to the optical transmission path. The observation optical system includes the bending portion 2b and the bending portion 2b. A signal cable inserted through the flexible portion 2c is connected.

開口１３の内側には，処置具の方向を変えるための処置具起立台１５が備えられている。処置具１２は，前述した挿入部２の湾曲部２ｂ及び軟性部２ｃ内に挿通された処置具チャンネル（図示せず）内を通じて，処置具起立台１５の外側に導出され，開口１３から突出されている。   Inside the opening 13, a treatment instrument stand 15 for changing the direction of the treatment instrument is provided. The treatment instrument 12 is led out of the treatment instrument stand 15 and protrudes from the opening 13 through the treatment instrument channel (not shown) inserted into the bending section 2b and the flexible section 2c of the insertion section 2 described above. ing.

図３は，先端部本体７において開口１３及び処置具起立台１５が配置された部分を示した断面図である。図３に示すように，先端部本体７には，処置具起立台１５が配置された溝部３１が形成されており，溝部３１の上端部が開口１３になっている。処置具起立台１５は，この溝部３１の内部において，先端部本体７の先端側と基端側との間で揺動するようになっている。また，処置具起立台１５及び溝部３１の側方には，処置具起立台１５と一体的に回転するレバー３２が配置されている。レバー３２は，先端部本体７において，溝部３１の側方に設けられた駆動室３３の内部に配置されている。溝部３１と駆動室３３との間には，壁部３５が形成されている。   FIG. 3 is a cross-sectional view showing a portion where the opening 13 and the treatment instrument stand 15 are arranged in the distal end portion body 7. As shown in FIG. 3, the distal end body 7 is formed with a groove 31 in which the treatment instrument stand 15 is disposed, and the upper end of the groove 31 is an opening 13. The treatment instrument stand 15 swings between the distal end side and the proximal end side of the distal end body 7 inside the groove 31. Further, a lever 32 that rotates integrally with the treatment instrument stand 15 is disposed on the side of the treatment instrument stand 15 and the groove 31. The lever 32 is disposed inside the driving chamber 33 provided on the side of the groove portion 31 in the tip end body 7. A wall portion 35 is formed between the groove portion 31 and the drive chamber 33.

処置具起立台１５とレバー３２は，軸３６を介して連結されている。軸３６は，壁部３５の下部を貫通するように，また，先端部２ａの長手方向（図３において手前側から後側に向かう方向）に対して略垂直に設けられている。軸３６の一端には，処置具起立台１５の下端部が固定されており，軸３６の他端には，レバー３２の下端部が固定されている。これにより，レバー３２を軸３６の上方において軸３６を中心として回転させると，レバー３２の回転に伴って，処置具起立台１５が軸３６の上方において軸３６を中心として一体的に回転し，処置具起立台１５の起立角度が変化する構成となっている。   The treatment instrument stand 15 and the lever 32 are connected via a shaft 36. The shaft 36 passes through the lower portion of the wall portion 35 and is provided substantially perpendicular to the longitudinal direction of the distal end portion 2a (the direction from the front side to the rear side in FIG. 3). The lower end of the treatment instrument stand 15 is fixed to one end of the shaft 36, and the lower end of the lever 32 is fixed to the other end of the shaft 36. Accordingly, when the lever 32 is rotated about the shaft 36 above the shaft 36, the treatment instrument stand 15 rotates integrally with the shaft 36 above the shaft 36 as the lever 32 rotates. The standing angle of the treatment instrument stand 15 is changed.

図４は，レバー３２の上端部を示した斜視図である。図４に示すように，レバー３２の上端部には，処置具起立台１５を操作するためのワイヤ４０の先端が取り付けられたピン４１と，ピン４１が通された孔４２が設けられ，さらに，ワイヤ４０を移動させるための溝４３が形成されている。ピン４１と孔４２は，レバー３２の長手方向に対して略垂直に設けられており，ピン４１は孔４２内で回転可能になっている。溝４３は，レバー３２の回転方向に沿って設けられ，レバー３２の上端部外周面から孔４２の内面まで開口している。ワイヤ４０の先端は，溝４３を通ってピン４１に取り付けられている。即ち，ワイヤ４０の先端はレバー３２に対して回転可能に取り付けられている。図５に示すように，ワイヤ４０を進退させると，ワイヤ４０が溝４３に沿って移動しながらピン４１を移動させ，ピン４１の移動に伴い，レバー３２がピン４１に対して相対的に回転しながら移動するようになっている。   FIG. 4 is a perspective view showing the upper end portion of the lever 32. As shown in FIG. 4, the upper end of the lever 32 is provided with a pin 41 to which the tip of the wire 40 for operating the treatment instrument stand 15 is attached and a hole 42 through which the pin 41 is passed. A groove 43 for moving the wire 40 is formed. The pin 41 and the hole 42 are provided substantially perpendicular to the longitudinal direction of the lever 32, and the pin 41 is rotatable in the hole 42. The groove 43 is provided along the rotation direction of the lever 32 and opens from the outer peripheral surface of the upper end of the lever 32 to the inner surface of the hole 42. The tip of the wire 40 is attached to the pin 41 through the groove 43. That is, the tip of the wire 40 is attached to the lever 32 so as to be rotatable. As shown in FIG. 5, when the wire 40 is advanced and retracted, the pin 41 is moved while the wire 40 moves along the groove 43, and the lever 32 rotates relative to the pin 41 as the pin 41 moves. While moving.

図５は，図３に示したＡ−Ａ線による先端部本体７の断面図である。図５に示すように，先端部本体７には，ワイヤ４０を挿通させるガイド孔５０が形成されている。ガイド孔５０の開口端部（図５ではガイド孔５０の左端部）には，前述した挿入部２の湾曲部２ｂ及び軟性部２ｃ内に挿通されたチューブ（ワイヤガイド）５１の先端部が接続されている。一方，ガイド孔５０の他端部（ガイド孔５０の開口端部とは反対側の端部）は，駆動部３３に開口している。ワイヤ４０は，チューブ５１内に挿通され，ガイド穴５０を通じて，駆動室３３の基端側に導出され，ワイヤ４０の先端がレバー３２の上端部に連結されている。   FIG. 5 is a cross-sectional view of the tip body 7 taken along line AA shown in FIG. As shown in FIG. 5, a guide hole 50 through which the wire 40 is inserted is formed in the distal end body 7. Connected to the opening end of the guide hole 50 (the left end of the guide hole 50 in FIG. 5) is the distal end of a tube (wire guide) 51 inserted into the bending portion 2b and the flexible portion 2c of the insertion portion 2 described above. Has been. On the other hand, the other end of the guide hole 50 (the end opposite to the opening end of the guide hole 50) is open to the drive unit 33. The wire 40 is inserted into the tube 51, led out to the proximal end side of the drive chamber 33 through the guide hole 50, and the distal end of the wire 40 is connected to the upper end portion of the lever 32.

チューブ５１には，チューブ５１の内面に沿って，コイルバネ５３が備えられている。このコイルバネ５３は，断面が略円形状の線材を螺旋状に形成したものである。また，コイルバネ５３は，外側をチューブ５１の内面に密着させるように備えられており，チューブ５１の先端部まで設けられている。ワイヤ４０は，コイルバネ５３の内側に挿通されており，チューブ５１の内面には接触しないようになっている。このようにチューブ５１の内面にコイルバネ５３が設けられていることにより，チューブ５１が補強され，ワイヤ４０の進退によってレバー３２を確実に操作することができ，また，チューブ５１の耐久性が向上する。また，挿入部２が湾曲する際，コイルバネ５３が挿入部２の変形に従って柔軟に湾曲し，チューブ５１を円滑に変形させることができる。さらに，コイルバネ５３の内側にワイヤ４０が挿通される空間が確保されるようにしながら湾曲するので，挿入部２が湾曲するときも，ワイヤ４０をコイルバネ５３の内側で円滑に進退させることができる。   The tube 51 is provided with a coil spring 53 along the inner surface of the tube 51. The coil spring 53 is formed by spirally forming a wire having a substantially circular cross section. In addition, the coil spring 53 is provided so that the outer side is in close contact with the inner surface of the tube 51, and is provided up to the tip of the tube 51. The wire 40 is inserted inside the coil spring 53 and does not contact the inner surface of the tube 51. Since the coil spring 53 is provided on the inner surface of the tube 51 in this way, the tube 51 is reinforced, the lever 32 can be reliably operated by the advancement and retraction of the wire 40, and the durability of the tube 51 is improved. . Further, when the insertion portion 2 is curved, the coil spring 53 is flexibly bent according to the deformation of the insertion portion 2 and the tube 51 can be smoothly deformed. Furthermore, since the wire 40 is bent while ensuring a space for the wire 40 to be inserted inside the coil spring 53, the wire 40 can be smoothly advanced and retracted inside the coil spring 53 even when the insertion portion 2 is bent.

ガイド孔５０の開口端部の内径は，コイルバネ５３の内径より大きく形成されている。また，ガイド孔５０は，開口端部から内部に向かうに従い，径が大きくなるように形成されている。   The inner diameter of the opening end of the guide hole 50 is formed larger than the inner diameter of the coil spring 53. Moreover, the guide hole 50 is formed so that a diameter may become large as it goes inside from an opening edge part.

ワイヤ４０をガイド孔５０から内部に向かって押し出すように前進させると，レバー３２が軸３６を中心として先端側に向かって回転し，ワイヤ４０を引っ張って後退させると，レバー３２が軸３６を中心として基端側に向かって回転する。図５に示した例では，レバー３２は，軸３６より先端側に上端部が移動した状態の位置ＰＬ１（図５において実線）と，軸３６より基端側に上端部が移動した状態の位置ＰＬ２（図５において一点鎖線）との間で回転させられるようになっている。また，このようにワイヤ４０を進退させることにより，レバー３２の回転に伴って，処置具起立台１５の先端部２ａに対する起立角度が調節される。レバー３２が位置ＰＬ１に移動したとき，レバー３２の移動に伴って，処置具起立台１５は先端側に最も倒れた状態になる位置ＰＢ１（図５において実線）に移動し，レバー３２が位置ＰＬ２に移動したときは，処置具起立台１５は最も起立した状態になる位置ＰＢ２（図５において一点鎖線）に移動するようになっている。なお，レバー３２を位置ＰＬ１と位置ＰＬ２との間の位置ＰＬ３（図５において二点鎖線）において起立させ，先端部２ａの長手方向に対して直角にした状態のとき，処置具起立台１５は位置ＰＢ１と位置ＰＢ２との間の位置ＰＢ３（図５において二点鎖線）に移動する。   When the wire 40 is advanced so as to be pushed out from the guide hole 50 toward the inside, the lever 32 rotates toward the distal end side about the shaft 36, and when the wire 40 is pulled and retracted, the lever 32 is centered on the shaft 36. Rotate toward the base end side. In the example shown in FIG. 5, the lever 32 has a position PL <b> 1 (solid line in FIG. 5) in a state where the upper end moves from the shaft 36 toward the distal end side, and a position in a state where the upper end moves from the shaft 36 toward the proximal end side. It can be rotated between PL2 (the chain line in FIG. 5). Further, by advancing and retracting the wire 40 in this way, as the lever 32 rotates, the standing angle with respect to the distal end portion 2a of the treatment instrument stand 15 is adjusted. When the lever 32 moves to the position PL1, with the movement of the lever 32, the treatment instrument stand 15 moves to a position PB1 (solid line in FIG. 5) where the treatment instrument stand 15 is most inclined to the distal end side, and the lever 32 moves to the position PL2. When moved to the position, the treatment instrument stand 15 is moved to a position PB2 (the one-dot chain line in FIG. 5) where the treatment tool stand 15 is in the most upright state. When the lever 32 is erected at a position PL3 (two-dot chain line in FIG. 5) between the positions PL1 and PL2 and is perpendicular to the longitudinal direction of the distal end portion 2a, the treatment instrument stand 15 is It moves to a position PB3 (two-dot chain line in FIG. 5) between the position PB1 and the position PB2.

ところで，チューブ５１やガイド孔５０に対するレバー３２の上端部の高さは，レバー３２の位置によって上下に変化する。従って，ワイヤ４０は，チューブ５１の先端部付近からレバー３２の上端部までの間において，レバー３２の上端部の位置に応じて，ガイド孔５０の半径方向，即ち，図５において上下方向に移動し，先端部２ａの長手方向に対する角度を変化させながら，レバー３２を押したり引いたりする。このようにワイヤ４０の先端側が上下に動くときも，ワイヤ４０は，先端部本体７の内面，例えば，ガイド孔５０の内面や駆動室３３の内面には接触しないようになっている。即ち，前述したように，ガイド孔５０は，開口端部から内部に向かうに従い径が大きくなるように形成されており，ワイヤ４０がガイド孔５０内で十分に余裕を持って上下移動できるようになっている。また，ガイド孔５０の開口端部がコイルバネ５３の内径より大きく形成されていることにより，ワイヤ４０がガイド孔５０の開口端部の周縁部に接触しないようになっている。このように，チューブ５１の先端部とレバー３２との間では，ワイヤ４０に接触するものは無く，例えばガイド孔５０の開口端部の周縁部や他端部の周縁部にワイヤ４０が引っ掛かるといったおそれがない。従って，ワイヤ４０を円滑に進退させることができる。また，ワイヤ４０を進退させるとき，ワイヤ４０はチューブ５１の内部でコイルバネ５３に接触するが，コイルバネ５３の内面は曲面状になっているので，ワイヤ４０の動きが妨げられることはなく，また，ワイヤ４０を損傷させるおそれもない。   By the way, the height of the upper end portion of the lever 32 with respect to the tube 51 and the guide hole 50 varies depending on the position of the lever 32. Accordingly, the wire 40 moves in the radial direction of the guide hole 50, that is, in the vertical direction in FIG. 5, depending on the position of the upper end portion of the lever 32 between the vicinity of the distal end portion of the tube 51 and the upper end portion of the lever 32. Then, the lever 32 is pushed or pulled while changing the angle of the distal end portion 2a with respect to the longitudinal direction. Thus, even when the distal end side of the wire 40 moves up and down, the wire 40 does not contact the inner surface of the distal end body 7, for example, the inner surface of the guide hole 50 or the inner surface of the drive chamber 33. That is, as described above, the guide hole 50 is formed so that its diameter increases from the opening end toward the inside so that the wire 40 can move up and down with sufficient margin in the guide hole 50. It has become. Further, since the opening end portion of the guide hole 50 is formed larger than the inner diameter of the coil spring 53, the wire 40 does not contact the peripheral edge portion of the opening end portion of the guide hole 50. As described above, there is nothing between the distal end portion of the tube 51 and the lever 32 that makes contact with the wire 40. For example, the wire 40 is caught on the peripheral edge portion of the opening end portion or the other end portion of the guide hole 50. There is no fear. Accordingly, the wire 40 can be smoothly advanced and retracted. When the wire 40 is advanced or retracted, the wire 40 contacts the coil spring 53 inside the tube 51, but the inner surface of the coil spring 53 is curved, so that the movement of the wire 40 is not hindered, There is no risk of damaging the wire 40.

例えば，図５に示した例では，レバー３２を位置ＰＬ２に移動させ，処置具起立台１５の起立角度を最大にしたとき，レバー３２の上端部はチューブ５１の先端部開口より低い位置に移動する。このとき，ワイヤ４０はコイルバネ５３の先端部の下端に接触した部分で下方に向かって曲がり，ワイヤ４０の角度が最も下向きに大きく傾斜した状態になっている。即ち，ワイヤ４０は，コイルバネ５３の先端部の下端に接触した部分を支点として，レバー３２を位置ＰＬ２に支持し，さらに，レバー３２を介して処置具起立台１５を位置ＰＢ２に支持する状態になっている。一方，レバー３２を位置ＰＬ１と位置ＰＬ２との間の位置ＰＬ３において起立させ，先端部２ａの長手方向に対して直角にした状態のとき，レバー３２の上端部は最も高い位置に移動し，また，チューブ５１の先端部開口より高い位置に移動する。このとき，ワイヤ４０はコイルバネ５３の先端部の上端に接触した部分で上方に向かって曲がり，ワイヤ４０の角度が最も上向きに大きく傾斜した状態になっている。即ち，ワイヤ４０は，コイルバネ５３の先端部の上端に接蝕した部分を支点として，レバー３２を位置ＰＬ３に支持し，さらに，レバー３２を介して処置具起立台１５を位置ＰＢ３に支持する状態になっている。そして，このようにコイルバネ５３の上端又は下端において曲げられるようにしながらワイヤ４０を進退させるときも，コイルバネ５３の内面が曲面になっているので，ワイヤ４０の動きが妨げられることがなく，ワイヤ４０を円滑に進退させることができる。   For example, in the example shown in FIG. 5, when the lever 32 is moved to the position PL2 and the rising angle of the treatment instrument stand 15 is maximized, the upper end of the lever 32 is moved to a position lower than the distal end opening of the tube 51. To do. At this time, the wire 40 bends downward at the portion that contacts the lower end of the tip of the coil spring 53, and the angle of the wire 40 is greatly inclined downward. That is, the wire 40 supports the lever 32 at the position PL2 with the portion contacting the lower end of the tip of the coil spring 53 as a fulcrum, and further supports the treatment instrument stand 15 at the position PB2 via the lever 32. It has become. On the other hand, when the lever 32 is erected at a position PL3 between the positions PL1 and PL2 and is perpendicular to the longitudinal direction of the tip 2a, the upper end of the lever 32 moves to the highest position, , Move to a position higher than the opening at the tip of the tube 51. At this time, the wire 40 bends upward at a portion in contact with the upper end of the distal end portion of the coil spring 53, and the angle of the wire 40 is greatly inclined upward. That is, the wire 40 supports the lever 32 at the position PL3 with the portion that contacts the upper end of the tip of the coil spring 53 as a fulcrum, and further supports the treatment instrument stand 15 at the position PB3 via the lever 32. It has become. Even when the wire 40 is advanced or retracted while being bent at the upper end or the lower end of the coil spring 53 as described above, the inner surface of the coil spring 53 is curved, so that the movement of the wire 40 is not hindered. Can be smoothly advanced and retracted.

次に，本実施の形態にかかる内視鏡１において，処置具１２の突出方向を変える操作について説明する。先ず，処置具１２の向きを先端部２ａの先端側に倒すときは，図５に示すように，ワイヤ４０をチューブ５１から前進させ，レバー３２を押して回転させ，レバー３２を位置ＰＬ１に移動させる。このレバー３２の回転に伴って処置具起立台１５が回転し，位置ＰＢ１に移動すると，処置具１２が先端部２ａの先端側に倒れる。   Next, an operation for changing the protruding direction of the treatment instrument 12 in the endoscope 1 according to the present embodiment will be described. First, when the direction of the treatment instrument 12 is tilted toward the distal end side of the distal end portion 2a, as shown in FIG. 5, the wire 40 is advanced from the tube 51, the lever 32 is pushed and rotated, and the lever 32 is moved to the position PL1. . When the treatment instrument stand 15 rotates with the rotation of the lever 32 and moves to the position PB1, the treatment instrument 12 falls to the distal end side of the distal end portion 2a.

また，処置具１２の向きを先端部２ａに対して起立させるときは，ワイヤ４０をチューブ５１側に向かって後退させ，レバー３２を引っ張って回転させ，レバー３２を位置ＰＬ２に移動させる。このレバー３２の回転に伴って処置具起立台１５が回転し，位置ＰＢ２に移動すると，処置具１２が処置具起立台１５に押され，先端部２ａに対して起立する。   When the treatment instrument 12 is raised with respect to the distal end portion 2a, the wire 40 is retracted toward the tube 51, the lever 32 is pulled and rotated, and the lever 32 is moved to the position PL2. When the treatment instrument stand 15 rotates with the rotation of the lever 32 and moves to the position PB2, the treatment instrument 12 is pushed by the treatment instrument stand 15 and stands up with respect to the distal end portion 2a.

レバー３２を位置ＰＬ１付近で移動させるときは，ワイヤ４０はコイルバネ５３の先端部の下端に接触する。また，レバー３２を位置ＰＬ２付近で移動させるときは，ワイヤ４０はコイルバネ５３の先端部の下端に接触して曲げられ，ワイヤ４０の角度が下向きに傾斜する。さらに，レバー３２を位置ＰＬ３付近で移動させるときは，レバー３２の上端部がチューブ５１の開口より上方に位置し，ワイヤ４０はコイルバネ５３の先端部の上端に接触して曲げられ，ワイヤ４０の角度が上向きに傾斜する。このように，ワイヤ４０がコイルバネ５３の先端部に接触し，また，コイルバネ５３の先端部によって曲げられた状態でワイヤ４０を進退させても，コイルバネ５３の先端部の上端及び下端が凸状の曲面になっていることにより，ワイヤ４０を円滑に進退させることができる。また，ガイド孔５０の内径がコイルバネ５３の内径より大きく形成されているので，ワイヤ４０が上下に傾斜しても，ガイド孔５０の内面に接触することはなく，ワイヤ４０を円滑に進退させることができる。   When the lever 32 is moved near the position PL1, the wire 40 contacts the lower end of the tip of the coil spring 53. When the lever 32 is moved in the vicinity of the position PL2, the wire 40 is bent in contact with the lower end of the tip of the coil spring 53, and the angle of the wire 40 is inclined downward. Further, when the lever 32 is moved in the vicinity of the position PL3, the upper end of the lever 32 is positioned above the opening of the tube 51, and the wire 40 is bent in contact with the upper end of the tip of the coil spring 53. The angle is inclined upward. Thus, even if the wire 40 is in contact with the tip of the coil spring 53 and the wire 40 is advanced and retracted while being bent by the tip of the coil spring 53, the upper and lower ends of the tip of the coil spring 53 are convex. Due to the curved surface, the wire 40 can be smoothly advanced and retracted. Further, since the inner diameter of the guide hole 50 is formed larger than the inner diameter of the coil spring 53, even if the wire 40 is tilted up and down, it does not contact the inner surface of the guide hole 50, and the wire 40 can be smoothly advanced and retracted. Can do.

かかる内視鏡１によれば，ガイド孔５０の内径がコイルバネ５３の内径より大きく形成されているので，ワイヤ４０をガイド孔５０内で進退させるとき，ワイヤ４０が上下に動いても，ワイヤ４０がガイド孔５０の内面に接触せず，ワイヤ４０を円滑に進退させることができる。ワイヤ４０がコイルバネ５３に接触しても，コイルバネ５３の表面が曲面になっているので，ワイヤ４０の動きが妨げられることはなく，ワイヤ４０を円滑に進退させることができる。このように，ワイヤ４０を円滑に進退させることができるため，処置具起立台１５の起立角度を円滑に変化させ，処置具１２の向きを円滑に調節することができ，操作性が良好である。また，ガイド孔５０の周縁部など，先端部本体７の内面に丸みを付けるといった難しい加工を行う必要が無く，低コストでワイヤ４０の操作性を向上させることができる。さらに，ワイヤ４０がガイド孔５０に接触せず，また，コイルバネ５３の内面が曲面になっていることにより，ワイヤ４０が損傷せず，ワイヤ４０の寿命が短くなることを防止できる。   According to the endoscope 1, since the inner diameter of the guide hole 50 is formed larger than the inner diameter of the coil spring 53, even when the wire 40 moves up and down in the guide hole 50, even if the wire 40 moves up and down, the wire 40 However, the wire 40 can be smoothly advanced and retracted without contacting the inner surface of the guide hole 50. Even if the wire 40 comes into contact with the coil spring 53, the surface of the coil spring 53 is curved, so that the movement of the wire 40 is not hindered and the wire 40 can be smoothly advanced and retracted. Thus, since the wire 40 can be smoothly advanced and retracted, the standing angle of the treatment instrument stand 15 can be changed smoothly, the direction of the treatment instrument 12 can be adjusted smoothly, and the operability is good. . Further, it is not necessary to perform a difficult process such as rounding the inner surface of the tip body 7 such as the peripheral edge of the guide hole 50, and the operability of the wire 40 can be improved at low cost. Furthermore, since the wire 40 does not contact the guide hole 50 and the inner surface of the coil spring 53 is a curved surface, the wire 40 is not damaged and the life of the wire 40 can be prevented from being shortened.

以上，本発明の実施の形態の一例を説明したが，本発明はかかるものに限定されない。例えば，本実施の形態では，ワイヤ４０をレバー３２を介して処置具起立台１５に接続したが，ワイヤ４０と処置具起立台１５を連結する構成は，かかるものに限定されない。例えば，レバーを設けず，ワイヤ４０を処置具起立台１５に接続して，ワイヤ４０の進退によって処置具起立台１５を直接回転させる構成にしても良い。この場合，ガイド孔５０は，処置具起立台１５が配置された溝部３１に開口させればよい。   As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to this. For example, in the present embodiment, the wire 40 is connected to the treatment instrument stand 15 via the lever 32, but the configuration for connecting the wire 40 and the treatment instrument stand 15 is not limited to this. For example, the wire 40 may be connected to the treatment instrument stand 15 without providing a lever, and the treatment instrument stand 15 may be directly rotated by the advancement / retraction of the wire 40. In this case, the guide hole 50 may be opened in the groove 31 where the treatment instrument stand 15 is disposed.

コイルバネ５３の形状は，略円形状の断面を有するものに限定されず，ワイヤ４０と接する側の表面が曲面となっていれば良く，例えば，略楕円形状の断面を有するものなどであってもよい。また，コイルバネ５３は，少なくともチューブ５１の先端部に設けられていれば良く，チューブ５１全体に沿って設けられていなくても良い。   The shape of the coil spring 53 is not limited to the one having a substantially circular cross section, and the surface on the side in contact with the wire 40 may be a curved surface. For example, the coil spring 53 may have a substantially elliptic cross section. Good. Further, the coil spring 53 may be provided at least at the distal end portion of the tube 51 and may not be provided along the entire tube 51.

本実施の形態では，レバー３２を位置ＰＬ２に移動させ，処置具起立台１５を位置ＰＢ１に移動させたとき，ワイヤ４０がコイルバネ５３の先端部における下端において曲がり，ワイヤ４０の角度が最も下向きに大きく傾斜し，レバー３２を位置ＰＬ３において起立させたとき，ワイヤ４０がコイルバネ５３の先端部における上端において曲がり，ワイヤ４０の角度が最も上向きに大きく傾斜することとしたが，レバー３２，処置具起立台１５，及びワイヤ４０の位置関係は，かかるものに限定されない。   In the present embodiment, when the lever 32 is moved to the position PL2 and the treatment instrument stand 15 is moved to the position PB1, the wire 40 is bent at the lower end of the distal end portion of the coil spring 53, and the angle of the wire 40 is most downward. When the lever 32 is largely inclined and the lever 32 is erected at the position PL3, the wire 40 is bent at the upper end of the distal end portion of the coil spring 53, and the angle of the wire 40 is inclined most greatly upward. The positional relationship between the base 15 and the wire 40 is not limited to this.

本実施の形態にかかる内視鏡の構成を説明した説明図である。It is explanatory drawing explaining the structure of the endoscope concerning this Embodiment. 挿入部の先端部を示した斜視図である。It is the perspective view which showed the front-end | tip part of the insertion part. 先端部本体の部分断面図である。It is a fragmentary sectional view of a tip part main part. レバーの上端部の斜視図である。It is a perspective view of the upper end part of a lever. 図３におけるＡ−Ａ線による断面図である。It is sectional drawing by the AA line in FIG.

符号の説明Explanation of symbols

１ 内視鏡
２ 挿入部
２ａ 先端部
７ 先端部本体
１２ 処置具
１５ 処置具起立台
３２ レバー
４０ ワイヤ
５０ ガイド孔
５１ チューブ
５３ コイルバネ DESCRIPTION OF SYMBOLS 1 Endoscope 2 Insertion part 2a Tip part 7 Tip part main body 12 Treatment tool 15 Treatment tool stand 32 Lever 40 Wire 50 Guide hole 51 Tube 53 Coil spring

Claims (4)

処置具の方向を変えるための処置具起立台を先端部に備えた内視鏡であって，
前記処置具起立台を操作するためのワイヤを備え，前記ワイヤを進退させることにより，前記処置具起立台の起立角度を調節する構成とし，
前記先端部に，前記ワイヤを挿通させるガイド孔が設けられ，
前記ガイド孔に，前記ワイヤを挿通させるチューブの先端部が接続され，
前記チューブの先端部の内面にコイルバネが設けられ，
前記ガイド孔の内径は，前記コイルバネの内径より大きく形成されたことを特徴とする，内視鏡。 An endoscope provided with a treatment instrument stand for changing the direction of the treatment instrument at the tip,
It comprises a wire for operating the treatment instrument stand, and is configured to adjust the standing angle of the treatment instrument stand by moving the wire forward and backward,
A guide hole for inserting the wire is provided at the tip,
A tip of a tube through which the wire is inserted is connected to the guide hole,
A coil spring is provided on the inner surface of the tip of the tube;
An endoscope, wherein an inner diameter of the guide hole is formed larger than an inner diameter of the coil spring. 前記処置具起立台と一体的に回転するレバーを備え，前記レバーにワイヤの先端が接続されたことを特徴とする，請求項１に記載の内視鏡。 The endoscope according to claim 1, further comprising a lever that rotates integrally with the treatment instrument stand, and a tip of a wire is connected to the lever. 前記ガイド孔は，開口端部から内部に向かうに従い径が大きくなるように形成されていることを特徴とする，請求項１又は２に記載の内視鏡。 The endoscope according to claim 1, wherein the guide hole is formed to have a diameter that increases from the opening end toward the inside. 前記ワイヤは，前記コイルバネの内面に接触することを特徴とする，請求項１，２又は３に記載の内視鏡。
The endoscope according to claim 1, wherein the wire contacts an inner surface of the coil spring.
JP2004171722A 2004-06-09 2004-06-09 Endoscope Expired - Fee Related JP4495527B2 (en)

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