JP4390315B2 - Endoscope - Google Patents

Endoscope Download PDF

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Publication number
JP4390315B2
JP4390315B2 JP15591299A JP15591299A JP4390315B2 JP 4390315 B2 JP4390315 B2 JP 4390315B2 JP 15591299 A JP15591299 A JP 15591299A JP 15591299 A JP15591299 A JP 15591299A JP 4390315 B2 JP4390315 B2 JP 4390315B2
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JP
Japan
Prior art keywords
tube
flexible tube
flexible
endoscope
skin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP15591299A
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Japanese (ja)
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JP2000342518A (en
Inventor
直哉 大内
健一 大原
喜久男 岩坂
知子 岩崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoya Corp
Original Assignee
Hoya Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to JP15591299A priority Critical patent/JP4390315B2/en
Publication of JP2000342518A publication Critical patent/JP2000342518A/en
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Description

【0001】
【発明の属する技術分野】
この発明は、内視鏡の挿入部等を外装する内視鏡の可撓管に関する。
【0002】
【従来の技術】
内視鏡用可撓管は、一般に、金属又はプラスチック製の帯材を一定の径で螺旋状に巻いて形成された螺旋管の外面に、金属細線を編組して形成された網状管を被覆し、その網状管の外面に合成樹脂材からなる一様な厚さの可撓性の外皮を被覆して構成されている。
【0003】
【発明が解決しようとする課題】
内視鏡を体腔内の深部等へ挿入するには、挿入部可撓管が必要な方向には柔軟に曲がり、且つ無用な横ぶれをしないことが望ましい。
【0004】
しかし、上述のような従来の内視鏡の可撓管の可撓性には方向による差がないので、曲がり易い柔軟な可撓性に構成すると横ぶれし易く、逆に横ぶれを小さく構成すると曲がるべき方向にも柔軟に曲がらなくなってしまう傾向があり、挿入性に不十分な点があった。
【0005】
そこで本発明は、体腔内への挿入上必要な方向には柔軟に曲がり、それ以外の方向には曲がり難くて、優れた挿入性を得ることができる内視鏡の可撓管を提供することを目的とする。
【0006】
【課題を解決するための手段】
上記の目的を達成するため、本発明の内視鏡の可撓管は、帯状部材をピッチ方向に隙間のあいたコイル状に巻いて形成された螺旋管と、複数の素線を並べた素線束を網状に編組して形成されて上記螺旋管の外面に被覆された網状管と、上記網状管の外面に被覆された可撓性の外皮とを有する内視鏡の可撓管であって、周方向の特定方向に、上記外皮の肉圧の厚い方向と肉圧の薄い方向とを形成することによって実現することができる。
【0007】
その場合に外皮の肉圧の薄い方向を180°対称の方向に形成して、それと直交する方向に上記外皮の肉圧の厚い方向を180°対称の方向に形成したり、或いは、上記外皮の肉圧の薄い方向を特定の一方向にのみ形成する等各種の態様をとることができる。
【0008】
【発明の実施の形態】
図面を参照して本発明の実施の形態を説明する。
図2は、本発明の参考例の内視鏡の全体構成を示しており、体腔内に挿入される挿入部は外力が加わった方向に自由に曲がる可撓管1によって外装されていて、その基端は操作部2の下端部に連結されている。
【0009】
可撓管1の先端には、操作部2に配置された操作ノブ4からの遠隔操作によって任意の方向に任意の角度だけ屈曲させることができる湾曲部3が連結され、対物光学系等を内蔵した先端部本体5が湾曲部3の先端に連結されている。
【0010】
また、操作部2の上端部近傍に連結された可撓性連結管6の先端には、図示されていないビデオプロセッサ兼光源装置に接続されるコネクタ7が取り付けられている。
【0011】
図3は、挿入部の可撓管1の構成部材を一層ずつ順に剥がして示しており、最内層は、例えばステンレス鋼製又は銅合金製の帯状部材をピッチ方向に隙間11のあいたコイル状に巻いて形成された螺旋管10により構成されている。螺旋管10はここでは二重であり、内層管と外層管とで巻き方向を相違させたものであるが、一重あるいは三重以上のものであってもよい。
【0012】
螺旋管10の外面には、金属製又は非金属製の複数の素線を並べた素線束を網状に編組して形成された網状管20が被覆されていて、その網状管20の外面に可撓性の外皮30が例えば押し出し成形によって被覆されている。外皮30は例えばポリウレタン樹脂を主成分としており、予めチューブ状に形成されたものであっても差しつかえない。
【0013】
図1は、可撓管1によって外装された挿入部部分の軸線に垂直な断面図(正面断面図)である。21〜27は、可撓管1内に全長にわたって挿通配置されたいわゆる内蔵物であり、21は観察画像信号伝送ケーブル、22は照明用ライトガイドファイババンドル、23,24,25は送気送水用チューブ、26は処置具挿通チャンネル、27は湾曲操作ワイヤである。
【0014】
図1に示されるように、外皮30は周方向に肉圧が一様ではなく、180°対称の上下方向(観察視野の上下方向であり、操作部2に対しては前後方向に対応する)においては、肉圧が例えば0.4mm程度に薄く形成されている。
【0015】
そして、その薄肉部30aから遠ざかるにしたがって外皮30の肉圧が徐々に厚くなり、上下方向と直交する左右方向(観察視野の左右方向であり、操作部2に対しても左右方向に対応する)において肉圧が最も厚く(例えば0.9mm)形成されている。30bがその厚肉部である。
【0016】
薄肉部30aと厚肉部30bとは可撓管1の全長にわたって同方向に形成されており、この可撓管1によって外装された挿入部分は、上下方向には柔軟で外力によって曲がり易く、左右方向にはそれより曲がり難い特性を有する。
【0017】
その結果、体腔内への挿入に際して、可撓管1によって外装された挿入部分の上下方向を体腔内壁の曲がり方向に合わせながら挿入することにより、可撓管1が体腔内壁の曲がり方向に沿って柔軟に曲がり、且つそれと直交する方向には曲がり難くて横ぶれせず、容易に挿入することができる。
【0018】
図4は、本発明の実施の形態の可撓管1によって外装された部分の正面断面図であり、薄肉部30aを上方向のみとした点だけが前述の参考例と相違し、参考例と同様の作用効果を得ることができる。
【0019】
なお本発明は上記実施の形態に限定されるものではなく、例えば可撓管1の長さ方向の一部分にだけ本発明を適用してもよい。具体的には、例えば可撓管1の先端寄りの部分にだけ薄肉部30aと厚肉部30bを形成し、それより手元側は全部厚肉部30bにしてもよい。また、本発明を可撓性連結管6に適用しても差し支えない。
【0020】
【発明の効果】
本発明によれば、可撓管が周方向の特定方向にだけ他の方向より曲がり易くなるので、体腔内への挿入に際して、横ぶれすることなく曲がってほしい方向だけ曲がり易い状態で挿入することができ、非常に優れた挿入性を得ることができる。
【図面の簡単な説明】
【図1】 本発明の参考例の内視鏡の可撓管によって外装された挿入部の正面断面図である。
【図2】 本発明の参考例の内視鏡の全体外観図である。
【図3】 本発明の参考例の可撓管の構成部材を一層ずつ順に剥がして示す側面図である。
【図4】 本発明の実施の形態の内視鏡の可撓管によって外装された挿入部の正面断面図である。
【符号の説明】
1 可撓管
10 螺旋管
20 網状管
30 外皮
30a 薄肉部
30b 厚肉部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope flexible tube that sheathes an insertion portion or the like of an endoscope.
[0002]
[Prior art]
Endoscopic flexible tubes are generally coated with a mesh tube formed by braiding metal wires on the outer surface of a spiral tube formed by spirally winding a metal or plastic strip with a constant diameter. The outer surface of the mesh tube is covered with a flexible outer skin made of a synthetic resin material and having a uniform thickness.
[0003]
[Problems to be solved by the invention]
In order to insert an endoscope into a deep portion or the like in a body cavity, it is desirable that the insertion portion flexible tube bends flexibly in a necessary direction and does not cause unnecessary lateral shaking.
[0004]
However, since there is no difference in the flexibility of the flexible tube of the conventional endoscope as described above, it is easy to bend when it is configured to be flexible and easy to bend, and conversely, the lateral shake is small. Then, there is a tendency that the bending direction cannot be flexibly made, and there is an insufficient insertion property.
[0005]
Therefore, the present invention provides a flexible tube for an endoscope that can bend flexibly in a direction necessary for insertion into a body cavity and hardly bend in other directions, and can obtain excellent insertability. With the goal.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the flexible tube of the endoscope of the present invention is a strand bundle in which a spiral tube formed by winding a strip-like member in a coil shape with a gap in the pitch direction and a plurality of strands are arranged. A flexible tube of an endoscope having a mesh tube formed by braiding the mesh tube and coated on the outer surface of the spiral tube, and a flexible skin coated on the outer surface of the mesh tube, It can be realized by forming a direction in which the skin pressure is thick and a direction in which the skin pressure is thin in a specific direction in the circumferential direction.
[0007]
In this case, the direction in which the skin pressure of the outer skin is thin is formed in a 180 ° symmetric direction, and the direction in which the thickness of the outer skin is thick is formed in a 180 ° symmetric direction in a direction perpendicular thereto, or Various modes such as forming a thin direction of the meat pressure only in a specific direction can be adopted.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an overall configuration of an endoscope according to a reference example of the present invention, and an insertion portion inserted into a body cavity is covered with a flexible tube 1 that bends freely in a direction in which an external force is applied. The proximal end is connected to the lower end of the operation unit 2.
[0009]
The distal end of the flexible tube 1 is connected to a bending portion 3 that can be bent at an arbitrary angle in an arbitrary direction by a remote operation from an operation knob 4 disposed in the operation portion 2, and includes an objective optical system and the like. The distal end body 5 is connected to the distal end of the bending portion 3.
[0010]
A connector 7 connected to a video processor / light source device (not shown) is attached to the distal end of the flexible connecting tube 6 connected in the vicinity of the upper end of the operation unit 2.
[0011]
FIG. 3 shows the constituent members of the flexible tube 1 of the insertion portion, one after another, and the innermost layer is formed of a strip-like member made of, for example, stainless steel or copper alloy in a coil shape with a gap 11 in the pitch direction. The spiral tube 10 is formed by winding. Here, the spiral tube 10 is double, and the inner layer tube and the outer layer tube have different winding directions, but may be single or triple or more.
[0012]
The outer surface of the spiral tube 10 is covered with a mesh tube 20 formed by braiding a bundle of strands made of a plurality of metal or non-metal wires into a mesh shape. The flexible outer skin 30 is covered by, for example, extrusion molding. The outer skin 30 is made of, for example, a polyurethane resin as a main component, and may be formed in a tube shape in advance.
[0013]
FIG. 1 is a cross-sectional view (front cross-sectional view) perpendicular to the axis of the insertion portion covered by the flexible tube 1. 21 to 27 are so-called built-in objects inserted through the flexible tube 1 over the entire length, 21 is an observation image signal transmission cable, 22 is a light guide fiber bundle for illumination, and 23, 24 and 25 are for air / water supply. A tube, 26 is a treatment instrument insertion channel, and 27 is a bending operation wire.
[0014]
As shown in FIG. 1, the skin 30 is not uniform in the circumferential direction, and the vertical direction is 180 ° symmetrical (the vertical direction of the observation field, corresponding to the front-rear direction with respect to the operation unit 2). In, the meat pressure is thinly formed to about 0.4 mm, for example.
[0015]
Then, as the distance from the thin-walled portion 30a increases, the thickness of the outer skin 30 gradually increases, and the left-right direction perpendicular to the up-down direction (the left-right direction of the observation field of view corresponds to the left-right direction with respect to the operation unit 2). The thickness of the wall is the thickest (for example, 0.9 mm). 30b is the thick part.
[0016]
The thin-walled portion 30a and the thick-walled portion 30b are formed in the same direction over the entire length of the flexible tube 1, and the insertion portion covered by the flexible tube 1 is flexible in the vertical direction and easily bent by an external force. The direction has the characteristic that it is harder to bend.
[0017]
As a result, during insertion into the body cavity, the flexible tube 1 is inserted along the bending direction of the inner wall of the body cavity by inserting the vertical direction of the insertion portion covered by the flexible tube 1 while matching the bending direction of the inner wall of the body cavity. It bends flexibly and is difficult to bend in a direction perpendicular to it, so that it can be easily inserted without being swayed.
[0018]
Figure 4 is a front sectional view of the exterior portion by the flexible tube 1 of implementation of the embodiment of the present invention, only in that only the upper direction the thin portion 30a is different from the foregoing reference example, Reference Example The same effect can be obtained.
[0019]
In addition, this invention is not limited to the said embodiment, For example, you may apply this invention only to a part of the length direction of the flexible tube 1. FIG. Specifically, for example, the thin portion 30a and the thick portion 30b may be formed only at the portion near the tip of the flexible tube 1, and the thicker portion 30b may be formed on the proximal side. Further, the present invention may be applied to the flexible connecting pipe 6.
[0020]
【The invention's effect】
According to the present invention, the flexible tube is more easily bent in a specific direction in the circumferential direction than in other directions, and therefore, when inserted into a body cavity, the flexible tube is inserted in a state in which it is easily bent only in a desired direction without being swayed. And very good insertability can be obtained.
[Brief description of the drawings]
FIG. 1 is a front sectional view of an insertion portion covered with a flexible tube of an endoscope according to a reference example of the present invention.
FIG. 2 is an overall external view of an endoscope according to a reference example of the present invention.
FIG. 3 is a side view showing the constituent members of the flexible tube according to the reference example of the present invention, one after another in order.
4 is a front sectional view of the insertion portion which is the exterior by a flexible tube of an endoscope implementation of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible tube 10 Spiral tube 20 Reticulated tube 30 Outer skin 30a Thin part 30b Thick part

Claims (1)

帯状部材をピッチ方向に隙間のあいたコイル状に巻いて形成された螺旋管と、複数の素線を並べた素線束を網状に編組して形成されて上記螺旋管の外面に被覆された網状管と、上記網状管の外面に被覆された可撓性の外皮とを有する可撓管の内部空間内に処置具挿通チャンネルが挿通配置された内視鏡において、
上記処置具挿通チャンネルを、観察視野における上下左右方向に対応する上記可撓管の内部空間内の上下左右方向において斜め下方向に配置すると共に、
上記可撓管の全長のうちの先端寄りの領域では、上記外皮の肉厚を上方向のみにおいて他の方向より薄く形成して他の方向はすべてそれより肉厚の厚い厚肉部とし、上記可撓管の全長のうちの先端寄り以外の領域では上記外皮の肉厚が全周において厚肉部になっていることを特徴とする内視鏡。
A spiral tube formed by winding a strip-like member in a coil shape with a gap in the pitch direction, and a mesh tube formed by braiding a bundle of strands in which a plurality of strands are arranged and coated on the outer surface of the spiral tube And an endoscope in which a treatment instrument insertion channel is inserted and disposed in an internal space of a flexible tube having a flexible skin coated on the outer surface of the mesh tube.
The treatment instrument insertion channel is disposed obliquely downward in the vertical and horizontal directions in the internal space of the flexible tube corresponding to the vertical and horizontal directions in the observation visual field,
In the region near the tip of the entire length of the flexible tube, the thickness of the outer skin is formed to be thinner than the other directions only in the upward direction, and all the other directions are thicker than that, An endoscope characterized in that the thickness of the outer skin is a thick portion in the entire circumference in a region other than the tip end of the entire length of the flexible tube .
JP15591299A 1999-06-03 1999-06-03 Endoscope Expired - Fee Related JP4390315B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15591299A JP4390315B2 (en) 1999-06-03 1999-06-03 Endoscope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15591299A JP4390315B2 (en) 1999-06-03 1999-06-03 Endoscope

Publications (2)

Publication Number Publication Date
JP2000342518A JP2000342518A (en) 2000-12-12
JP4390315B2 true JP4390315B2 (en) 2009-12-24

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Family Applications (1)

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JP15591299A Expired - Fee Related JP4390315B2 (en) 1999-06-03 1999-06-03 Endoscope

Country Status (1)

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