JP4190056B2 - End of the endoscope - Google Patents

End of the endoscope Download PDF

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Publication number
JP4190056B2
JP4190056B2 JP16577098A JP16577098A JP4190056B2 JP 4190056 B2 JP4190056 B2 JP 4190056B2 JP 16577098 A JP16577098 A JP 16577098A JP 16577098 A JP16577098 A JP 16577098A JP 4190056 B2 JP4190056 B2 JP 4190056B2
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JP
Japan
Prior art keywords
distal end
tip
main body
end portion
diameter
Prior art date
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Expired - Lifetime
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JP16577098A
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Japanese (ja)
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JP2000000204A (en
Inventor
雅弘 高野
章 杉山
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Hoya Corp
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Hoya Corp
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Priority to JP16577098A priority Critical patent/JP4190056B2/en
Publication of JP2000000204A publication Critical patent/JP2000000204A/en
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Description

【０００１】
【発明の属する技術分野】
この発明は、先端部本体に先端キャップが取り付けられた内視鏡の先端部に関する。
【０００２】
【従来の技術】
内視鏡の先端部本体は、対物光学系その他各種構造物を内部に固定するために金属、セラミックス又は合成樹脂等によって形成されるが、接触する体腔内粘膜との間の電気絶縁や、硬いものとぶつかったときの破損防止等の目的から、先端部本体の側面を被覆する先端キャップが取り付けられている。
【０００３】
そのような従来の内視鏡の先端部は、例えば図５に示されるように、先端部本体５１の外周面に部分的に径の細い円周溝５２を形成し、それに合わせて先端キャップ５３の内周面に内方に突出するリング状突起部５４を形成して、先端キャップ５３を弾性変形させることにより先端部本体５１に着脱できるようにしている。
【０００４】
【発明が解決しようとする課題】
しかし、上述のように構成された従来の内視鏡の先端部では、先端キャップ５３の内周面に内方に突出するリング状突起部５４があるので、先端キャップ５３を成形する金型を分割構造にして一回の成形ごとに軸線方向に移動させる必要があり、先端キャップ５３の製造が非常に面倒でコストがかかってしまう。
【０００５】
そこで本発明は、先端部本体に取り付けられる先端キャップを容易に製造することができる内視鏡の先端部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、本発明の内視鏡の先端部は、挿入部の先端に設けられた硬質材料からなる先端部本体に弾力性のある材料からなる先端キャップが取り付けられた内視鏡の先端部において、上記先端部本体の外周面に部分的に太径部を形成し、上記先端キャップの内周面全体を上記先端部本体の太径部以外の部分に嵌合する寸法に形成すると共に、上記先端部本体の太径部に被さる部分だけ上記先端キャップの肉厚を他の部分より薄く形成したことを特徴とする。
【０００７】
なお、上記先端キャップが、上記先端部本体に取り付けられた状態では外周面に盛り上がりのない形状になるようにしてもよい。そして、上記太径部が上記先端部本体の中間部分に形成されていてもよく、或いは上記先端部本体の後端部分近傍に形成されていてもよい。
【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１は、本発明の第１の実施の形態の内視鏡の先端部を示しており、前方視型の内視鏡に本発明を適用した例である。
【０００９】
可撓管によって外装された挿入部の先端には、例えばステンレス鋼製の先端部本体１が連結されており、観察窓２と図示されていない照明窓等が、先端部本体１の先端面に配置されている。
【００１０】
観察窓２の奥には、対物光学系３が内蔵されていて、その対物光学系３による被写体の結像位置に固体撮像素子４の撮像面が配置されている。５は、固体撮像素子４で撮像された内視鏡観察像の映像信号を伝送する信号ケーブルである。
【００１１】
６と７は、空気と水が選択的に送られてくる送気チューブと送水チューブであり、その先側において先端部本体１に形成された連通孔８で一繋がりになっている。そして、連通孔８に嵌め込まれたノズル９が観察窓２の表面に向かって開口している。
【００１２】
先端部本体１には、例えば電気絶縁性の弾力性のある合成樹脂材またはゴム材によって形成された先端キャップ１１が着脱自在に取り付けられており、ノズル９はその先端キャップ１１に一体成形によって形成されている。
【００１３】
先端キャップ１１は、先端部本体１の外周面を被覆する円筒形状に形成されていて、その先端面側の部分に、ノズル９が内側に向かって出っ張って成形されている。
【００１４】
先端部本体１の外周面の中間部分には、その部分だけ他より外径が太い太径部１ａが環状に出っ張って形成されていて、その太径部１ａ以外の部分は均一の外径寸法に形成されている。
【００１５】
一方、先端キャップ１１は、図２に示されるように、内周面１１ａ全体が先端部本体１の太径部１ａ以外の部分に嵌合する均一の寸法に形成されている。したがって、先端キャップ１１を成形する金型は非常にシンプルなものでよく、製造が簡単である。
【００１６】
先端キャップ１１の肉厚は、先端部本体１の太径部１ａに被さる部分１１ｂだけが、他の部分より薄く形成されている。その厚みの差ｔは、ｔ≒先端部本体１の外周面からの太径部１ａの突出高さ、である。
【００１７】
このように形成された先端キャップ１１は、図１に示されるように先端部本体１に被さった状態に取り付けられるが、その際、先端部本体１の太径部１ａ部分を乗り越える部分が弾性変形をしながら被せられ、太径部１ａを乗り越えた部分は元の寸法に戻る。
【００１８】
したがって、弾力性のある先端キャップ１１が先端部本体１の太径部１ａを挟み付ける状態になって先端キャップ１１が先端部本体１に係止され、先端キャップ１１が先端部本体１に取り付けられた状態では、先端キャップ１１の薄肉部１１ｂが先端部本体１の太径部１ａに被さるので、先端キャップ１１の外周面は、盛り上がりがなく大きな凹みもない滑らかな形状になる。
【００１９】
図３は本発明の第２の実施の形態の内視鏡の先端部を示しており、観察窓２と照明窓１２が先端部本体１の側面に配置された側方視型の内視鏡に本発明を適用した例である。
【００２０】
この実施の形態においては、観察窓２の奥に配置された対物光学系３による被写体の結像位置に、イメージガイドファイババンドル１３の入射端面が配置されている。１４は、照明窓１２の奥に配置されたライトガイドファイババンドルである。
【００２１】
また、送気送水用のノズル９は、金属パイプによって形成されて単体で先端部本体１に固着されている。先端部本体１には、後端部の近傍に太径部１ａが形成されている。
【００２２】
先端部本体１に被覆される先端キャップ１１は、例えば電気絶縁性の弾力性のある合成樹脂材またはゴム材によって、図４に示されるように、内周面１１ａ全体が先端部本体１の太径部１ａ以外の部分に嵌合する寸法に形成されている。したがって、先端キャップ１１を成形する金型は非常にシンプルなものでよく、製造が簡単である。
【００２３】
先端キャップ１１の肉厚は、第１の実施の形態と同様に、先端部本体１の太径部１ａに被さる部分１１ｂだけが、他の部分より薄く形成されている。その厚みの差ｔは、ｔ≒先端部本体１の外周面からの太径部１ａの突出高さ、である。
【００２４】
このように形成された先端キャップ１１は、図３に示されるように先端部本体１に被さった状態に取り付けられる。先端キャップ１１の後端部分は押し広げられて弾性変形した状態で固定されるので、先端部本体１に対してよく密着し、めくれて破損するような事故が発生しない。
【００２５】
先端キャップ１１は、接着又は機械的結合によって先端部本体１に固定され、先端キャップ１１が先端部本体１に取り付けられた状態では、先端キャップ１１の薄肉部１１ｂが先端部本体１の太径部１ａに被さるので、先端キャップ１１の外周面は、盛り上がりがなく大きな凹みもない滑らかな形状になる。
【００２６】
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、例えば先端部本体１は、金属、セラミックス又は硬質の合成樹脂等のような硬質材料によって形成されていればよい。
【００２７】
【発明の効果】
本発明によれば、先端部本体の外周面に部分的に太径部があっても、先端キャップの内周面全体を先端部本体の太径部以外の部分に嵌合する寸法に形成したことにより、先端キャップを成形する金型は非常にシンプルなものでよく、先端キャップを容易に低コストで製造することができる。
【００２８】
そして、先端部本体の太径部に被さる部分だけ先端キャップの肉厚を他の部分より薄く形成したことにより、先端キャップが先端部本体に取り付けられた状態では、先端キャップの外周面を滑らかな形状にすることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の内視鏡の先端部の側面断面図である。
【図２】本発明の第１の実施の形態の先端キャップの側面断面図である。
【図３】本発明の第２の実施の形態の内視鏡の先端部の側面断面図である。
【図４】本発明の第２の実施の形態の先端キャップの側面断面図である。
【図５】従来の内視鏡の先端部の側面断面図である。
【符号の説明】
１ 先端部本体
１ａ 太径部
１１ 先端キャップ
１１ａ 内周面
１１ｂ 太径部に被さる部分（薄肉部）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a distal end portion of an endoscope in which a distal end cap is attached to a distal end portion main body.
[0002]
[Prior art]
The body of the distal end of the endoscope is formed of metal, ceramics, synthetic resin, etc. to fix the objective optical system and other various structures inside. A tip cap that covers the side surface of the tip portion main body is attached for the purpose of preventing breakage when hitting an object.
[0003]
For example, as shown in FIG. 5, the distal end portion of such a conventional endoscope is formed with a circumferential groove 52 having a small diameter on the outer peripheral surface of the distal end portion main body 51, and a distal end cap 53 corresponding thereto. A ring-shaped protrusion 54 that protrudes inward is formed on the inner peripheral surface, and the tip cap 53 is elastically deformed so that it can be attached to and detached from the tip portion main body 51.
[0004]
[Problems to be solved by the invention]
However, in the distal end portion of the conventional endoscope configured as described above, since there is a ring-shaped projection portion 54 projecting inwardly on the inner peripheral surface of the distal end cap 53, a mold for molding the distal end cap 53 is used. It is necessary to make a split structure and move it in the axial direction for each molding, and the manufacture of the tip cap 53 is very troublesome and costly.
[0005]
Then, an object of this invention is to provide the front-end | tip part of the endoscope which can manufacture easily the front-end | tip cap attached to a front-end | tip part main body.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the distal end portion of the endoscope of the present invention is an endoscope in which a distal end cap made of a resilient material is attached to a distal end portion body made of a hard material provided at the distal end of the insertion portion. At the tip of the mirror, a portion having a large diameter is partially formed on the outer peripheral surface of the tip portion main body, and the entire inner peripheral surface of the tip cap is fitted to a portion other than the large diameter portion of the tip portion main body. At the same time, the thickness of the tip cap is made thinner than the other portions only in the portion covering the large diameter portion of the tip portion main body.
[0007]
The tip cap may be shaped so that the outer peripheral surface does not rise when attached to the tip body. And the said large diameter part may be formed in the intermediate part of the said front-end | tip part main body, or may be formed in the rear-end part vicinity of the said front-end | tip part main body.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a distal end portion of an endoscope according to a first embodiment of the present invention, and is an example in which the present invention is applied to a front-view type endoscope.
[0009]
A distal end body 1 made of, for example, stainless steel is connected to the distal end of the insertion portion covered with the flexible tube, and an observation window 2 and an illumination window (not shown) are provided on the distal end surface of the distal end body 1. Is arranged.
[0010]
An objective optical system 3 is built in the back of the observation window 2, and the imaging surface of the solid-state imaging device 4 is arranged at the imaging position of the subject by the objective optical system 3. Reference numeral 5 denotes a signal cable that transmits a video signal of an endoscopic observation image captured by the solid-state imaging device 4.
[0011]
Reference numerals 6 and 7 denote an air supply tube and a water supply tube through which air and water are selectively sent, and are connected to each other by a communication hole 8 formed in the distal end portion main body 1 on the front side. A nozzle 9 fitted in the communication hole 8 opens toward the surface of the observation window 2.
[0012]
A tip cap 11 made of, for example, an electrically insulating and elastic synthetic resin material or rubber material is detachably attached to the tip portion main body 1, and the nozzle 9 is formed on the tip cap 11 by integral molding. Has been.
[0013]
The distal end cap 11 is formed in a cylindrical shape that covers the outer peripheral surface of the distal end main body 1, and a nozzle 9 protrudes inward from a portion on the distal end surface side.
[0014]
A large-diameter portion 1a having a larger outer diameter than the other portion is formed in an annular shape on the intermediate portion of the outer peripheral surface of the tip portion main body 1, and the portions other than the large-diameter portion 1a have a uniform outer diameter. Is formed.
[0015]
On the other hand, as shown in FIG. 2, the tip cap 11 is formed to have a uniform dimension in which the entire inner peripheral surface 11 a is fitted to a portion other than the large-diameter portion 1 a of the tip portion main body 1. Accordingly, the mold for forming the tip cap 11 may be very simple and easy to manufacture.
[0016]
As for the thickness of the tip cap 11, only the portion 11b covering the large-diameter portion 1a of the tip portion main body 1 is formed thinner than the other portions. The difference in thickness t is t≈projection height of the large-diameter portion 1 a from the outer peripheral surface of the tip portion main body 1.
[0017]
The tip cap 11 formed in this way is attached in a state of covering the tip portion main body 1 as shown in FIG. 1, but at that time, the portion of the tip portion main body 1 that gets over the large-diameter portion 1 a is elastically deformed. The portion that has been put on and over the thick-diameter portion 1a returns to its original size.
[0018]
Accordingly, the resilient tip cap 11 is in a state of sandwiching the large-diameter portion 1a of the tip portion main body 1, the tip cap 11 is locked to the tip portion main body 1, and the tip cap 11 is attached to the tip portion main body 1. In this state, since the thin portion 11b of the tip cap 11 covers the large diameter portion 1a of the tip portion main body 1, the outer peripheral surface of the tip cap 11 has a smooth shape with no bulge and no large dent.
[0019]
FIG. 3 shows a distal end portion of an endoscope according to a second embodiment of the present invention, and a side-view type endoscope in which an observation window 2 and an illumination window 12 are arranged on the side surface of the distal end portion main body 1. This is an example in which the present invention is applied.
[0020]
In this embodiment, the incident end face of the image guide fiber bundle 13 is arranged at the imaging position of the subject by the objective optical system 3 arranged in the back of the observation window 2. Reference numeral 14 denotes a light guide fiber bundle disposed in the back of the illumination window 12.
[0021]
The air / water nozzle 9 is formed of a metal pipe and is fixed to the tip body 1 as a single unit. A large-diameter portion 1a is formed in the distal end portion body 1 in the vicinity of the rear end portion.
[0022]
The tip cap 11 covered by the tip portion main body 1 is made of, for example, an electrically insulating elastic synthetic resin material or rubber material, and the entire inner peripheral surface 11a is thick as shown in FIG. It is formed in a dimension that fits into a portion other than the diameter portion 1a. Accordingly, the mold for forming the tip cap 11 may be very simple and easy to manufacture.
[0023]
As with the first embodiment, the thickness of the tip cap 11 is such that only the portion 11b covering the large-diameter portion 1a of the tip portion main body 1 is thinner than the other portions. The difference in thickness t is t≈projection height of the large-diameter portion 1 a from the outer peripheral surface of the tip portion main body 1.
[0024]
The tip cap 11 formed in this way is attached in a state of covering the tip portion main body 1 as shown in FIG. Since the rear end portion of the tip cap 11 is expanded and fixed in an elastically deformed state, the tip cap 11 adheres well to the tip portion main body 1, and an accident that turns and breaks does not occur.
[0025]
The distal end cap 11 is fixed to the distal end main body 1 by adhesion or mechanical coupling, and in a state where the distal end cap 11 is attached to the distal end main body 1, the thin portion 11 b of the distal end cap 11 is a large diameter portion of the distal end main body 1. Since it covers 1a, the outer peripheral surface of the tip cap 11 has a smooth shape with no rise and no large dents.
[0026]
In addition, this invention is not limited to the said embodiment, For example, the front-end | tip part main body 1 should just be formed with hard materials, such as a metal, ceramics, or a hard synthetic resin.
[0027]
【The invention's effect】
According to the present invention, the entire inner peripheral surface of the tip cap is formed to have a size that fits to a portion other than the large diameter portion of the tip end body, even if the tip portion main body has a partially large diameter portion. Accordingly, the mold for forming the tip cap may be very simple, and the tip cap can be easily manufactured at low cost.
[0028]
In addition, by forming the tip cap thinner than the other portions only in the portion covering the large-diameter portion of the tip portion main body, the outer peripheral surface of the tip cap is smooth when the tip cap is attached to the tip portion main body. It can be shaped.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a distal end portion of an endoscope according to a first embodiment of the present invention.
FIG. 2 is a side sectional view of the tip cap according to the first embodiment of the present invention.
FIG. 3 is a side sectional view of a distal end portion of an endoscope according to a second embodiment of the present invention.
FIG. 4 is a side sectional view of a tip cap according to a second embodiment of the present invention.
FIG. 5 is a side sectional view of a distal end portion of a conventional endoscope.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tip part main body 1a Large diameter part 11 End cap 11a Inner peripheral surface 11b The part (thin part) which covers a large diameter part

Claims (4)

挿入部の先端に設けられた硬質材料からなる先端部本体に弾力性のある材料からなる先端キャップが取り付けられた内視鏡の先端部において、
上記先端部本体の外周面に部分的に太径部を形成し、上記先端キャップの内周面全体を上記先端部本体の太径部の外径より細くて上記太径部以外の部分に嵌合する一定の径に形成すると共に、上記先端部本体の太径部に被さる部分は、肉厚が上記先端部本体の外周面からの上記太径部の突出高さ分だけ他の部分より薄くて、弾力的に広げることにより上記太径部に被さるように形成したことを特徴とする内視鏡の先端部。In the distal end portion of the endoscope in which the distal end cap made of a resilient material is attached to the distal end portion body made of a hard material provided at the distal end of the insertion portion,
A large-diameter portion is partially formed on the outer peripheral surface of the tip portion main body, and the entire inner peripheral surface of the tip cap is thinner than the outer diameter of the large-diameter portion of the tip portion main body and is fitted to a portion other than the large- diameter portion and forming a constant diameter of the case, the portion that covers the large diameter portion of the tip body, the thickness is thinner than the thickness by the height of the other portion protruding in diameter from the outer peripheral surface of the distal end portion main body And a distal end portion of the endoscope, wherein the distal end portion is formed so as to cover the above-mentioned large-diameter portion by expanding elastically . 上記先端キャップが、上記先端部本体に取り付けられた状態では外周面に盛り上がりのない形状になる請求項１記載の内視鏡の先端部。The distal end portion of the endoscope according to claim 1, wherein the distal end cap has a shape that does not swell on an outer peripheral surface when attached to the distal end portion main body. 上記太径部が上記先端部本体の中間部分に形成されている請求項１又は２記載の内視鏡の先端部。The distal end portion of the endoscope according to claim 1 or 2, wherein the large diameter portion is formed at an intermediate portion of the distal end portion main body. 上記太径部が上記先端部本体の後端部分近傍に形成されている請求項１又は２記載の内視鏡の先端部。The distal end portion of the endoscope according to claim 1 or 2, wherein the large diameter portion is formed in the vicinity of a rear end portion of the distal end portion main body.
JP16577098A 1998-06-15 1998-06-15 End of the endoscope Expired - Lifetime JP4190056B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16577098A JP4190056B2 (en) 1998-06-15 1998-06-15 End of the endoscope

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Application Number Priority Date Filing Date Title
JP16577098A JP4190056B2 (en) 1998-06-15 1998-06-15 End of the endoscope

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JP2000000204A JP2000000204A (en) 2000-01-07
JP4190056B2 true JP4190056B2 (en) 2008-12-03

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JP5352649B2 (en) * 2011-09-05 2013-11-27 富士フイルム株式会社 End of endoscope insertion part and endoscope

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JP3392920B2 (en) * 1993-11-26 2003-03-31 ペンタックス株式会社 Endoscope tip
JP3517290B2 (en) * 1994-11-16 2004-04-12 ペンタックス株式会社 Endoscope tip
JPH09276208A (en) * 1996-04-10 1997-10-28 Asahi Optical Co Ltd Tip part of endoscope
JPH09299316A (en) * 1996-05-16 1997-11-25 Olympus Optical Co Ltd Endoscope

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