JPS6317448Y2 - - Google Patents
Info
- Publication number
- JPS6317448Y2 JPS6317448Y2 JP1982131015U JP13101582U JPS6317448Y2 JP S6317448 Y2 JPS6317448 Y2 JP S6317448Y2 JP 1982131015 U JP1982131015 U JP 1982131015U JP 13101582 U JP13101582 U JP 13101582U JP S6317448 Y2 JPS6317448 Y2 JP S6317448Y2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- coil body
- treatment instrument
- endoscope
- outer diameter
- 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
Links
- 238000003780 insertion Methods 0.000 claims description 38
- 230000037431 insertion Effects 0.000 claims description 38
- 238000011282 treatment Methods 0.000 claims description 27
- 230000002093 peripheral effect Effects 0.000 description 13
- 238000005452 bending Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012277 endoscopic treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Description
本考案は内視鏡の処置具挿通管の改良に関す
る。
内視鏡において鉗子等の処置具を挿通するた
め、その内視鏡の挿入部内には挿通用チヤンネル
を形成する可撓性の挿通管が配設されている。と
ころで、この挿通管として単にプラスチツク製の
チユーブを使用すると、湾曲させたときに腰折れ
が激しく、これを防ぐため、壁厚の大きなものを
採用せざるを得ない。しかし、内視鏡の処置具挿
通管としてはできるだけその外径を小さくする必
要がある。そこで、処置具挿通管の外周にコイル
を巻装する方式が提案されている。これとしては
実公昭48−7827号公報のものと実開昭53−93092
号公報のものとがある。
前者の公報の方式は柔軟で薄肉のプラスチツク
製チユーブの外表面に、その断面形状がきわめて
平たい扁平で薄板形状のものとしたコイルを陥し
た状態で巻回させたものである。しかし、このコ
イルの素材は帯状のきわめて薄いものとなるのが
普通である。したがつて、これでは強度不足でプ
ラスチツク製チユーブの腰折れ（チユーブの一部
が扁平になつて急角度で折れる現象）を防止しき
れない。このため、特に湾曲角度が大きく曲率半
径が小さくなる内視鏡には使用不可能であつた。
しかも、帯状素材の両側端が鋭いエツジ状になり
やすく、この部分で内視鏡の内蔵物を傷付けるこ
とがあつた。さらに、コイルはチユーブに対して
陥する状態で固定されているため、湾曲動作を繰
り返すにつれ、チユーブが切れる危険があつた。
一方、後者（実開昭53−93092号公報）の方式
はプラスチツク製のチユーブの外周部分に螺施状
等の周回溝を設け、この溝内に収まるようにコイ
ルをゆるく嵌着させたものである。しかしなが
ら、上記チユーブはもともと薄い壁厚をもつもの
であり、その外周部分に溝を設けることはかなり
困難な製造工程を必要とし、製造コストが著しく
増大するとともに、機械的強度もあまり期待でき
ない。
本考案は上記事情に着目してなされたもので、
その目的とするところは大きく湾曲させても腰折
れが生じにくく、内視鏡の他の内蔵物を傷付けた
りチユーブ切れを起したりすることなく、機械的
強度があるとともに、製造コストの低減を図るこ
とができ、しかも、極力細径化が図れるなどすぐ
れた内視鏡の処置具挿通管を提供することにあ
る。
以下、本考案の一実施例を第１図ないし第４図
にもとづいて説明する。
第１図中１１は内視鏡挿入部であり、この内視
鏡挿入部１１の基端は図示しない操作部に連結さ
れている。この内視鏡挿入部１１は基端側に位置
する可撓管部１２と、この可撓管部１２の先端に
連結された湾曲管部１３と、この湾曲管部１３の
先端に連結される先端硬性部１４とから構成され
ている。上記可撓管部１２は外力によつて湾曲さ
せられるように構成されている。また、上記湾曲
管部１３は複数の湾曲駒１５…を互いに枢支して
連結した湾曲芯１６の外周に外皮１７を被覆して
なり、この湾曲管部１３は内視鏡挿入部１１内に
挿通するとともに先端を上記先端硬性部１４に連
結した操作ワイヤ１８…を上記操作部側で押し引
きすることにより強制的に湾曲させられるように
なつている。上記先端硬性部１４には外部に開口
する通孔１９が形成され、また、この他にも対物
レンズ系２１など内視鏡として必要なものが設け
られる。さらに、内視鏡挿入部１１内にはイメー
ジガイドフアイバ２２および処置具挿通管２３な
どが挿通されている。そして、上記イメージガイ
ドフアイバ２２の先端は先端硬性部１４に取付け
固定されるとともに、上記対物レンズ系２１に対
し光学的に連結されている。また、上記処置具挿
通管２３の先端は上記通孔１９に連通するように
先端硬性部１４に取付け固定されている。さら
に、この処置具挿通管２３の基端側は上記操作部
に導びかれ、その操作部に形成された処置具挿入
口部（図示しない。）に連結されている。しかし
て、上記処置具挿通管２３は鉗子、カテーテルや
高周波治療具などの内視鏡用処置具を体腔内へ挿
通するための挿通用チヤンネル２４を形成するよ
うになつている。また、この挿通用チヤンネル２
４を利用して吸引を行なうこともできる。
ところで、上記処置具挿通管２３は第２図で示
すように構成される。すなわち、この処置具挿通
管２３は、たとえば沸素樹脂材などで成形された
可撓性を有するチユーブ２５の外周に、１条巻き
としたコイル体２６を嵌装してなり、上記コイル
体２６は内視鏡挿入部１１における湾曲管部１３
内にほぼ対応して位置する上記チユーブ２５の部
分にのみ嵌装されている。また、このコイル体２
６が嵌装する上記チユーブ２５の第１の外周部分
２５ａの外径D1はコイル体２６を嵌装させない
基端側に位置する第２の外周部分２５ｂの外径
D2より小さく形成されている。
上記コイル体２６の素線２７の断面形状は第３
図でも示すように上記チユーブ２５の長手方向に
沿つてその長軸を沿わせた略長円形としてなり、
この実施例ではたとえば断面形状が円形である金
属素線を圧延して扁平にしたのちこれをら施状に
巻くことにより形成される。つまり、長軸方向の
両端を半円形とするとともにその半円形を接線と
しての２直線でそれぞれ結ぶ形状となつている。
そして、素線２７の平らな面２７ａがチユーブ２
５の外周部分２５ａの周面に接するように嵌装さ
れている。ここで、コイル体２６の内径D3は上
記外周部分２５ａの外径D1に略等しくする。ま
た第３図で示すところの素線２７の短径の長さａ
と長径の長さｂとの比ｂ／ａは1.2ないし５の範
囲にあるように設定する。なお、コイル体２６に
おけ素線２７のピツチ間隔Ｐは必ずしも厳密に揃
える必要はないが、製作上著しく困難とならない
範囲で可及的に等間隔に揃えることが望ましい。
しかして、上記構成によれば、コイル体２６を
嵌装したチユーブ２５の第１の外周部分２５ａは
湾曲管部１３が強制的に湾曲させられるとき、そ
れに応じて湾曲する。しかし、コイル体２６の素
線２７とチユーブ２５との接触面積が大きく、そ
の素線２７とチユーブ２５との間での滑りは抑制
される。しかも、コイル体２６が全体にわたつて
適度な剛性を示す。したがつて、処置具挿通管２
３が特に小さな曲率半径で、かつ大きな湾曲角度
で曲げてもコイル体２６にはピツチＰの乱れが生
じない。また、コイル体２６の剛性によりチユー
ブ２５の直径方向の形状は全長にわたり円形に保
持される。つまり、腰折れを起すことなく、その
挿通用チヤンネル２４内には処置具を円滑に挿通
できる。
なお、上記実施例の構成において素線２７の断
面形状である略長円形の短径ａと長径ｂの比ｂ／
ａを1.2ないし５の範囲としたが、これは最も望
ましい範囲であるからである。その理由は次の通
りである。すなわち、素線２７の断面形状が真円
に近くなるにつれ、チユーブ２５の周面に接する
面積が少なくなり、チユーブ２５に対して素線２
７が滑りやすくなつて部分的にピツチの乱れ（ず
れ）が生じ、その素線２７間の大きな〓間からチ
ユーブ２５の一部が突き出してこの部分で腰折れ
を生じやすくなる。また、逆に素線２７の断面形
状が扁平になるにつれ、コイル体２６の剛性が弱
くなり、コイル体２６の直径方向の断面形状が円
形を保てなくなり、この場合も腰折れを生じやす
くなる。しかし、上記範囲内にあれば、より顕著
にその不都合を回避できるのである。
一方、上記実施例の構成においては、コイル体
２６を嵌装する第１の外周部分２５ａの外径D1
を第２の外周部分２５ｂの外径D2よりも小さく
したから、それだけコイル体２６の突出を少なく
できる。したがつて、処置具挿通管２３を全長に
わたつて極力細くできる。時に、湾曲管部１３内
では各内蔵部材がそれぞれ激しく湾曲させられる
ため、互いに干渉しやすいが、その湾曲管部１３
内における部分を細くできるので、その干渉を極
力防止して内蔵部材相互の損傷を防止できる。ま
た、第１の外周部分２５ａと第２の外周部分２５
ｂとの間には段差２５ｃが形成されるので、この
段差２５ｃによりコイル体２６の基端部における
ずれを阻止することができる。さらに、上記実施
例における素線２７は圧延により製作加工するの
で、加工硬化により機械的強度が増して適度の剛
性を有するコイル体２６が得られる。
次に、上記処置具挿通管２３についての各部の
具体的な寸法の実例を挙げておく。チユーブ２５
については第１の外周部分２５ａの外径D1を2.3
mm、第２の外周部分２５ｂの外径D2を2.6mm、内
径D4を2.0mmとする。そして、このチユーブ２５
の第１の外周部分２５ａに被嵌するコイル体２６
の種類として次表で示す，，，の４種類
を挙げる。なお、コイル体２６における素線２７
のピツチＰは0.5mmとする。
The present invention relates to an improvement of a treatment instrument insertion tube of an endoscope. In order to insert a treatment tool such as forceps into an endoscope, a flexible insertion tube forming an insertion channel is disposed within the insertion portion of the endoscope. By the way, if a plastic tube is simply used as the insertion tube, it will bend sharply when bent, and to prevent this, one with a thick wall must be used. However, it is necessary to make the outer diameter of the treatment instrument insertion tube of an endoscope as small as possible. Therefore, a method has been proposed in which a coil is wound around the outer periphery of the treatment instrument insertion tube. This includes the one published in Utility Model Publication No. 48-7827 and the one published in Utility Model Publication No. 53-93092.
There is one in the publication number. The method disclosed in the former publication involves winding a coil in the shape of a flat thin plate with an extremely flat cross-section around the outer surface of a flexible, thin-walled plastic tube. However, the material of this coil is usually extremely thin and strip-shaped. Therefore, this is not strong enough to prevent the plastic tube from buckling (a phenomenon in which a portion of the tube becomes flattened and breaks at a steep angle). For this reason, it cannot be used particularly in endoscopes with a large bending angle and a small radius of curvature.
Moreover, both ends of the band-shaped material tend to have sharp edges, which can sometimes damage the internal components of the endoscope. Furthermore, since the coil was fixed in a depressed state relative to the tube, there was a risk that the tube would break as the bending operation was repeated. On the other hand, the latter method (Japanese Utility Model Application Publication No. 53-93092) has a circumferential groove, such as a threaded groove, on the outer periphery of a plastic tube, and the coil is fitted loosely into this groove. be. However, the tube originally has a thin wall thickness, and providing a groove on its outer periphery requires a rather difficult manufacturing process, which significantly increases the manufacturing cost and does not provide much mechanical strength. This invention was made with attention to the above circumstances,
The aim is to reduce the risk of bending even when the endoscope is bent significantly, to provide mechanical strength without damaging other built-in components of the endoscope or to break the tube, and to reduce manufacturing costs. It is an object of the present invention to provide a treatment instrument insertion tube for an endoscope which is excellent in that the diameter can be reduced as much as possible. An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Reference numeral 11 in FIG. 1 is an endoscope insertion section, and the proximal end of this endoscope insertion section 11 is connected to an operation section (not shown). The endoscope insertion section 11 includes a flexible tube section 12 located on the proximal side, a curved tube section 13 connected to the distal end of the flexible tube section 12, and a curved tube section 13 connected to the distal end of the curved tube section 13. The tip is composed of a rigid tip portion 14. The flexible tube section 12 is configured to be bent by external force. The curved tube section 13 is formed by covering the outer periphery of a curved core 16 in which a plurality of bending pieces 15 are pivotally supported and connected to each other, and the curved tube section 13 is inserted into the endoscope insertion section 11. The operating wire 18, which is inserted through and whose tip end is connected to the rigid distal end portion 14, is pushed and pulled on the operating portion side to forcibly bend the operating wire 18. A through hole 19 that opens to the outside is formed in the rigid tip portion 14, and other components necessary for an endoscope, such as an objective lens system 21, are provided. Further, an image guide fiber 22, a treatment instrument insertion tube 23, and the like are inserted into the endoscope insertion section 11. The distal end of the image guide fiber 22 is attached and fixed to the rigid distal end portion 14, and is optically connected to the objective lens system 21. Further, the distal end of the treatment instrument insertion tube 23 is attached and fixed to the distal end rigid portion 14 so as to communicate with the through hole 19. Further, the proximal end side of the treatment instrument insertion tube 23 is guided to the operation section and connected to a treatment instrument insertion opening (not shown) formed in the operation section. The treatment instrument insertion tube 23 forms an insertion channel 24 through which an endoscopic treatment instrument such as forceps, a catheter, or a high-frequency treatment instrument is inserted into the body cavity. Also, this insertion channel 2
4 can also be used to perform suction. By the way, the treatment instrument insertion tube 23 is constructed as shown in FIG. That is, this treatment instrument insertion tube 23 is formed by fitting a coil body 26 wound in one thread around the outer periphery of a flexible tube 25 made of, for example, a fluororesin material. is the curved tube part 13 in the endoscope insertion part 11
It is fitted only in the portion of the tube 25 that is located approximately correspondingly within the tube. In addition, this coil body 2
The outer diameter D1 of the first outer circumferential portion 25a of the tube 25 into which the coil body 26 is fitted is the outer diameter of the second outer circumferential portion 25b located on the proximal end side where the coil body 26 is not fitted.
D is formed smaller than 2 . The cross-sectional shape of the wire 27 of the coil body 26 is the third
As shown in the figure, the tube 25 has a substantially elliptical shape with its long axis running along the longitudinal direction of the tube 25,
In this embodiment, the wire is formed by rolling a metal wire having a circular cross-sectional shape to make it flat, and then winding it into a round shape. In other words, both ends in the long axis direction are semicircular, and the semicircles are connected by two straight lines as tangents.
Then, the flat surface 27a of the wire 27 is connected to the tube 2.
It is fitted so as to be in contact with the circumferential surface of the outer circumferential portion 25a of No.5. Here, the inner diameter D 3 of the coil body 26 is made approximately equal to the outer diameter D 1 of the outer peripheral portion 25a. In addition, the length a of the minor axis of the strand 27 as shown in FIG.
The ratio b/a between the length b and the length b of the major axis is set to be in the range of 1.2 to 5. Note that the pitch intervals P of the wires 27 in the coil body 26 do not necessarily have to be made exactly the same, but it is desirable to make them as evenly spaced as possible without making it extremely difficult to manufacture. According to the above configuration, the first outer peripheral portion 25a of the tube 25 into which the coil body 26 is fitted curves accordingly when the curved tube portion 13 is forcibly curved. However, the contact area between the wire 27 of the coil body 26 and the tube 25 is large, and slipping between the wire 27 and the tube 25 is suppressed. Moreover, the coil body 26 exhibits appropriate rigidity throughout. Therefore, the treatment instrument insertion tube 2
3 has a particularly small radius of curvature, and even if the coil body 26 is bent at a large angle of curvature, no disturbance in pitch P occurs in the coil body 26. Further, due to the rigidity of the coil body 26, the shape of the tube 25 in the diametrical direction is maintained circular over the entire length. In other words, the treatment instrument can be smoothly inserted into the insertion channel 24 without bending. In addition, in the configuration of the above embodiment, the ratio b/
The value a is set in the range of 1.2 to 5 because this is the most desirable range. The reason is as follows. That is, as the cross-sectional shape of the wire 27 becomes closer to a perfect circle, the area in contact with the circumferential surface of the tube 25 decreases, and the wire 2
7 becomes slippery, causing a local pitch disorder (shift), and a portion of the tube 25 protrudes from the large gap between the strands 27, making it easy to bend at this portion. Conversely, as the cross-sectional shape of the strands 27 becomes flat, the rigidity of the coil body 26 becomes weaker, and the diametrical cross-sectional shape of the coil body 26 becomes unable to maintain a circular shape, which also tends to cause bending. However, within the above range, this inconvenience can be more significantly avoided. On the other hand, in the configuration of the above embodiment, the outer diameter D 1 of the first outer peripheral portion 25a into which the coil body 26 is fitted
Since it is made smaller than the outer diameter D 2 of the second outer peripheral portion 25b, the protrusion of the coil body 26 can be reduced accordingly. Therefore, the treatment instrument insertion tube 23 can be made as thin as possible over its entire length. Sometimes, each built-in member inside the curved tube section 13 is bent violently, so they tend to interfere with each other; however, the curved tube section 13
Since the inner part can be made thinner, interference between them can be prevented as much as possible, and damage to the built-in members can be prevented. In addition, the first outer peripheral portion 25a and the second outer peripheral portion 25
Since a step 25c is formed between the coil body 26 and the coil body 26, the step 25c can prevent the base end portion of the coil body 26 from shifting. Furthermore, since the strands 27 in the above embodiments are manufactured by rolling, the mechanical strength increases due to work hardening, and the coil body 26 having appropriate rigidity can be obtained. Next, examples of specific dimensions of each part of the treatment instrument insertion tube 23 will be given. tube 25
For this, the outer diameter D 1 of the first outer peripheral portion 25a is 2.3
mm, the outer diameter D 2 of the second outer peripheral portion 25b is 2.6 mm, and the inner diameter D 4 is 2.0 mm. And this tube 25
A coil body 26 that fits into the first outer peripheral portion 25a of
There are four types as shown in the table below. Note that the wire 27 in the coil body 26
The pitch P is 0.5mm.
【表】
上記，の形式のものは内径D3が第１の外
周部分２５ａの外径D1に等しいため、コイル体
２６の嵌装作業が容易である。また、，のも
のはコイル体２６の外径が第２の外周部分２５ｂ
の外径D2に一致するため、処置具挿通管２３の
外径が全長にわたり同じであると実質的にみなす
ことができる。したがつて、実際上種々都合がよ
いので採用されるに至つている。各形式，，
，ともａとｂの比については実際に試したと
ころいずれも望ましい部類に属する。また、と
の形式ではその内径D3が2.1mmでチユーブ２５
の第１の外周部分２５ａの外径D1の2.3mmよりも
小さい。このため、コイル体２６はチユーブ２５
の外周面に強く密着して第５図で示すようにな
る。したがつて、この両者間の摩擦力が著しく大
きく、相互の間が容易にずれない。このため、よ
り小さな曲率半径で曲げてもコイル体２６におけ
る素線２７のピツチの乱れが生じにくい。つま
り、との形式のものに比べてチユーブ２５の
腰折れ防止効果が一段と大きい。しかし、この
とのものの場合、チユーブ２５にコイル体２６
を嵌装した際、コイル体２６の内面がチユーブ２
５の外面に規制されて多少大きくなることにより
チユーブ２５の変形はごくわずかである。そし
て、実際にはのものが使用される。つまり、処
置具挿通管２３の外径をできるだけ小さくするた
め、素線２７の厚さａは0.15mmのもの、コイル体
２６とチユーブ２５の密着性を高めるためコイル
体２６の内径D3が2.1mmのものを採用したのであ
る。
第６図は本考案の他の実施例を示すもので、こ
の実施例はコイル体２６の両端部における素線２
７を密に巻き、中間部分は適当なピツチＰで略均
一に巻く。また、この場合、両端の密巻部２７
ｂ，２７ｃの内径をチユーブ２５の第１の外周部
分２５ａの外径D1より若干小さくすることが望
ましい。このような構成にすれば、湾曲性能にほ
とんど影響を及ぼすことなく、チユーブ２５とコ
イル体２６との密着性を高めることができる。し
たがつて湾曲作用を繰り返して与えても、特に、
両端部でのずれが生じにくく、そして、全長にわ
たるずれも防止できる。
また、第７図は上記第６図で示した実施例にお
けるコイル体２６の内径をチユーブ２５の第１の
外周部分２５ａの外径よりも小さくしてコイル体
２６の素線２７がチユーブ２５の外周面部にわず
かにくい込むようにしたものである。このように
すればそのチユーブ２５とコイル体２６の密着性
をより高めることができる。
第８図はさらに本考案の他の実施例を示すもの
で、これは被固定部材としての先端硬性部１４に
形成した取付け用嵌入穴３１内に対してチユーブ
２５の先端を嵌入して固定するにあたり、チユー
ブ２５の先端近傍まで巻回したコイル体２６とと
もに、上記チユーブ２５を嵌入し、接着剤等３２
で固めたものである。このようにすれば、コイル
体２６が先端硬性部１４と一体化してチユーブ２
５と先端硬性部１４との継ぎ目３３の境界付近で
のチユーブ２５の折れを防止し、チユーブ２５を
無理のないゆるやかな曲りとするとともに、処置
具の挿通も容易となる。
以上説明したように本考案によれば、外径の細
径化を確保しながら小さな曲率半径、大きな湾曲
角度で曲げても腰折れを生じることなく、処置具
の挿通がきわめて容易である。そして、従来例に
見たようにチユーブの外周面部にわざわざ溝を形
成する必要がなく、したがつて、製作が容易でコ
ストの低減化を大巾に図ることができる。また、
コイル体の素線の断面形状がチユーブの長手方向
にその長軸を沿わせた略長円形としたから素線の
断面形状を円形としたものに比べて処置具挿通管
の外径を小さくできると同時に、素線の断面形状
に鋭部がないので、チユーブを傷付けたり特に製
作時において内視鏡の他の内蔵物、たとえばイメ
ージガイドフアイバ等を損傷させたりすることが
なく安全である。[Table] Since the inner diameter D 3 of the type shown above is equal to the outer diameter D 1 of the first outer peripheral portion 25a, the work of fitting the coil body 26 is easy. In addition, in the case of , the outer diameter of the coil body 26 is the second outer peripheral portion 25b.
It can be substantially considered that the outer diameter of the treatment instrument insertion tube 23 is the same over the entire length. Therefore, it has come to be adopted due to its various practical advantages. Each format,,
, and the ratios of a and b have all been tested and are in the desirable category. In addition, the inner diameter D 3 of the type is 2.1 mm and the tube is 25 mm.
is smaller than the outer diameter D 1 of 2.3 mm of the first outer circumferential portion 25a. Therefore, the coil body 26 is connected to the tube 25.
5, as shown in FIG. Therefore, the frictional force between the two is extremely large, and the two do not easily shift. Therefore, even if the coil body 26 is bent with a smaller radius of curvature, the pitch of the wires 27 in the coil body 26 is less likely to be disturbed. In other words, the effect of preventing the tube 25 from buckling is much greater than that of the type. However, in this case, the coil body 26 is attached to the tube 25.
When fitted, the inner surface of the coil body 26 is connected to the tube 2.
The deformation of the tube 25 is negligible because it is restricted by the outer surface of the tube 25 and becomes somewhat larger. And what is actually used. That is, in order to make the outer diameter of the treatment instrument insertion tube 23 as small as possible, the thickness a of the wire 27 is 0.15 mm, and the inner diameter D 3 of the coil body 26 is 2.1 mm in order to improve the adhesion between the coil body 26 and the tube 25. mm was adopted. FIG. 6 shows another embodiment of the present invention, in which strands of wire 2 at both ends of the coil body 26 are shown.
7 tightly and approximately evenly in the middle with an appropriate pitch P. In addition, in this case, the tightly wound portions 27 at both ends
It is desirable that the inner diameters of the tubes b and 27c be slightly smaller than the outer diameter D1 of the first outer peripheral portion 25a of the tube 25. With such a configuration, the adhesion between the tube 25 and the coil body 26 can be improved without substantially affecting the bending performance. Therefore, even if the bending action is repeatedly applied, especially
Misalignment at both ends is less likely to occur, and misalignment over the entire length can also be prevented. FIG. 7 also shows that the inner diameter of the coil body 26 in the embodiment shown in FIG. It is designed to be slightly recessed into the outer peripheral surface. In this way, the adhesion between the tube 25 and the coil body 26 can be further improved. FIG. 8 shows another embodiment of the present invention, in which the tip of the tube 25 is fitted and fixed into the fitting hole 31 formed in the rigid tip portion 14 as the member to be fixed. At this time, the tube 25 is inserted together with the coil body 26 wound up to the vicinity of the tip of the tube 25, and adhesive etc. 32 are inserted.
It is solidified with. In this way, the coil body 26 is integrated with the rigid tip portion 14 and the tube 2
This prevents the tube 25 from bending near the boundary of the seam 33 between the tube 5 and the rigid distal end portion 14, allows the tube 25 to bend smoothly and easily, and allows for easy insertion of a treatment instrument. As explained above, according to the present invention, the treatment instrument can be inserted very easily without bending even when bent with a small radius of curvature and a large angle of curvature while ensuring a small outer diameter. Further, unlike the conventional example, there is no need to take the trouble to form a groove on the outer circumferential surface of the tube, and therefore manufacturing is easy and costs can be significantly reduced. Also,
Since the cross-sectional shape of the wire of the coil body is approximately oval with its long axis along the longitudinal direction of the tube, the outer diameter of the treatment instrument insertion tube can be made smaller than when the cross-sectional shape of the wire is circular. At the same time, since there are no sharp parts in the cross-sectional shape of the strands, it is safe because the tube will not be damaged or other internal components of the endoscope, such as the image guide fiber, will not be damaged, especially during manufacturing.
第１図は本考案の一実施例を示す内視鏡挿入部
の側断面図、第２図は同じくその処置具挿通管の
側断面図、第３図は同じくコイル体の素線の断面
図、第４図は同じくコイル体の側断面図、第５図
ないし第８図はそれぞれ異なる他の実施例を示す
処置具挿通管の側断面図である。
１１……内視鏡挿入部、１４……先端硬性部、
２３……処置具挿通管、２５……チユーブ、２６
……コイル体、２７……素線、３１……嵌入穴、
２５ａ……第１の外周部分、２５ｂ……第２の外
周部分、D1，D2……外径、D3……内径。
Fig. 1 is a side sectional view of an endoscope insertion section showing an embodiment of the present invention, Fig. 2 is a side sectional view of the treatment instrument insertion tube, and Fig. 3 is a sectional view of the strands of the coil body. , FIG. 4 is a side sectional view of the coil body, and FIGS. 5 to 8 are side sectional views of the treatment instrument insertion tube showing other different embodiments. 11...Endoscope insertion part, 14...Tip rigid part,
23...Treatment instrument insertion tube, 25...Tube, 26
... Coil body, 27 ... Element wire, 31 ... Fitting hole,
25a...first outer circumferential portion, 25b...second outer circumferential portion, D1 , D2 ...outer diameter, D3 ...inner diameter.
Claims (1)
内視鏡の処置具挿通管において、上記コイル体の
素線の断面形状を、上記チユーブの長手方向にそ
の長軸を沿わせた略長円形に形成し、上記コイル
体を嵌装する上記チユーブ部分の外径をコイル体
を嵌装しないチユーブの他の部分の外径より細く
形成するとともに、上記コイル体は、少なくとも
内視鏡挿入部の湾曲管部に対応した上記チユーブ
部分に嵌装した事を特徴とする内視鏡の処置具挿
通管。 In an endoscope treatment instrument insertion tube in which a coil body is fitted around the outer periphery of a flexible tube, the cross-sectional shape of the strands of the coil body is approximately the length of the tube with its long axis running in the longitudinal direction of the tube. The tube is formed into a circular shape, and the outer diameter of the tube portion into which the coil body is fitted is formed to be smaller than the outer diameter of the other portion of the tube into which the coil body is not fitted. A treatment instrument insertion tube for an endoscope, characterized in that the tube portion corresponds to the curved tube portion of the endoscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13101582U JPS5936302U (en) | 1982-08-30 | 1982-08-30 | Endoscope treatment instrument insertion tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13101582U JPS5936302U (en) | 1982-08-30 | 1982-08-30 | Endoscope treatment instrument insertion tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5936302U JPS5936302U (en) | 1984-03-07 |
| JPS6317448Y2 true JPS6317448Y2 (en) | 1988-05-18 |
Family
ID=30296339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13101582U Granted JPS5936302U (en) | 1982-08-30 | 1982-08-30 | Endoscope treatment instrument insertion tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5936302U (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60212142A (en) * | 1984-04-09 | 1985-10-24 | オリンパス光学工業株式会社 | Endoscope |
| JPH0526567Y2 (en) * | 1985-05-15 | 1993-07-06 | ||
| JPH0733764Y2 (en) * | 1987-05-20 | 1995-08-02 | オリンパス光学工業株式会社 | Endoscope |
| JP2009254798A (en) * | 2008-03-28 | 2009-11-05 | Olympus Medical Systems Corp | Tube for endoscope |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS487827U (en) * | 1971-06-07 | 1973-01-29 | ||
| JPS5247346U (en) * | 1975-09-30 | 1977-04-04 | ||
| JPS57136432A (en) * | 1981-02-19 | 1982-08-23 | Olympus Optical Co | Tube for endoscope |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53150092U (en) * | 1977-04-30 | 1978-11-25 |
-
1982
- 1982-08-30 JP JP13101582U patent/JPS5936302U/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS487827U (en) * | 1971-06-07 | 1973-01-29 | ||
| JPS5247346U (en) * | 1975-09-30 | 1977-04-04 | ||
| JPS57136432A (en) * | 1981-02-19 | 1982-08-23 | Olympus Optical Co | Tube for endoscope |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5936302U (en) | 1984-03-07 |
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