JP3645224B2 - Hood member mounting tool - Google Patents

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JP3645224B2
JP3645224B2 JP2002040532A JP2002040532A JP3645224B2 JP 3645224 B2 JP3645224 B2 JP 3645224B2 JP 2002040532 A JP2002040532 A JP 2002040532A JP 2002040532 A JP2002040532 A JP 2002040532A JP 3645224 B2 JP3645224 B2 JP 3645224B2
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hood member
distal end
endoscope
tip
end portion
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JP2003116773A (en
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康太 石引
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Olympus Corp
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Olympus Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、内視鏡挿入部の先端部にフード部材を装着するときに用いるフード部材装着具に関する。
【０００２】
【従来の技術】
従来、手術に用いる内視鏡装置の一例として、内視鏡の挿入部の先端部に対物レンズ、ライトガイド、空気・水送り口及び吸引口を配設して形成したものがある。このような内視鏡装置では、ライトガイドから生体組織等の被写体に光を当て、この光を当てた被写体を対物レンズを介して視認し、空気・水送り口より送出した空気或いは水やその他の物質を吸引口で吸引し得るようになっている。
【０００３】
ところで、例えば胃に内視鏡を挿入しようとすると、胃の粘膜が内視鏡の挿入部の先端部に設けた対物レンズに覆い被さるように接触して、先が見えなくなる場合が多々あった。
【０００４】
このことに対応して、特開平１１−２０６７０２号公報には、内視鏡の挿入部の先端部に、粘膜が対物レンズに覆い被さり視野を失うことを防止するためのガイド部を設けた内視鏡の先端構造が開示されている。この内視鏡の先端構造のガイド部は、フード状の部材となっており、内周面が先端部の先端面からアールを描いて拡開状に形成されている。
【０００５】
しかしながら、特開平１１−２０６７０２号公報に記載の構造では、ガイド部の突出が長いと、対物レンズがガイド部に近接している場合や、近年普及してきている視野角が広角で観察視野の形状が非円形で視野角が方向によって異なるビデオスコープの場合には、視野にガイド部が見えてしまい観察性能が低下していた。逆に、ガイド部が視野に入らないようにガイド部の突出長を短くすると、粘膜が対物レンズに覆い被さるのを防止するという効果が十分得られず、挿入性、観察性能が低下していた。
【０００６】
【発明が解決しようとする課題】
フード部材を内視鏡の先端部に着脱自在に設けた内視鏡装置では、フード部材を内視鏡の先端部に装着する際に先端部のフード部材への押し込み量が足らなかった場合、フード部材が正規の位置より突出して、観察視野にフード部材が見える量が多くなる。逆に、フード部材を正規の位置よりも突出長が短くなるように装着した場合には、フード部材の効果が落ちてしまう。これを防止するために、フード部材に軸方向の位置決め部を設けたものでも、フード部材が軟性の材質で形成されている場合には、装着の際に位置決め部が変形してしまい、正規の位置に装着できない場合が多々あった。
【０００７】
また、フード部材を内視鏡の先端部に着脱自在に形成した内視鏡装置では、フード部材が視野に合わせた形状に形成されている場合に、フード部材の回転方向が正規の位置と異なる位置に装着される虞れがあり、観察視野にフード部材が入る量が多くなることがあった。
【０００８】
このような問題を解決するために、内視鏡挿入部の先端部にフード部材の位置決め機構を設けると、内視鏡挿入部の先端部が複雑化、大型化してしまうという問題がある。
【０００９】
本発明は、上記事情に鑑みてなされたものであり、内視鏡の挿入部の先端部に容易且つ正確にフード部材を装着できるようにしたフード部材装着具の提供を目的とする。
【００１０】
【課題を解決するための手段】
前記目的を達成するため請求項１に記載のフード部材装着具は、内視鏡の挿入部先端部に着脱自在なフード部材を装着するためのフード部材装着具において、前記フード部材の位置を規制するフード部材規制手段と、前記挿入部先端部の位置を規制する先端部規制手段と、を具備し、前記フード部材を前記挿入部先端部に装着する場合に、前記挿入部先端部に対する前記フード部材の装着位置を規制することを特徴とする。
【００１１】
請求項２に記載のフード部材装着具は、前記フード部材規制手段が、前記フード部材の軸方向の位置を規制するフード部材軸方向規制部を有し、前記先端部規制手段は前記挿入部先端部の前記軸方向の位置を規制する先端部軸方向規制部を有することを特徴とする。
【００１２】
請求項３に記載の内視鏡装置は、前記フード部材規制手段が、前記フード部材の回転方向の位置を規制するフード部材回転方向規制部を有し、前記先端部規制手段は前記挿入部先端部の前記回転方向の位置を規制する先端部回転方向規制部を有することを特徴とする。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
（第１の実施の形態）
図１ないし図６は本発明の第１の実施の形態に係り、図１に内視鏡装置の全体構成を示す説明図、図２は内視鏡の先端部の断面図、図３は内視鏡の先端部の正面図、図４は内視鏡の先端部に着脱自在に接続されるフード部材を示す側面図、図５はモニタに表示される観察画像を示す平面図、図６は図５の観察画像を表示する場合の観察視野領域を示す説明図である。
【００１４】
（構成）
図１に内視鏡装置の全体構成を示す。
図１に示すように、内視鏡装置１は、内視鏡２と、光源装置３と、ビデオプロセッサ５と、モニタ６とから構成されている。
【００１５】
内視鏡２は後述の撮像手段を備えている。光源装置３は、内視鏡２に着脱自在に接続されて、内視鏡２に設けられたライトガイドに照明光を供給する。ビデオプロセッサ５は、信号ケーブル４を介して内視鏡２と接続されて内視鏡２の撮像手段を制御すると共に、撮像手段から得られた信号を処理する。モニタ６は、ビデオプロセッサ５から出力される被写体像に対応する映像を表示する。
【００１６】
内視鏡２は、挿入部７と、操作部８と、連結コード９と、コネクタ部１０と、電気コネクタ部１１とを有している。
【００１７】
挿入部７は、可撓性を有し細長に形成されている。操作部８は、挿入部７の基端側に接続されている。連結コード９は、可撓性を有し、操作部８の側部から延出する。コネクタ部１０は、連結コード９の端部に設けられ、前記光源装置３と着脱自在の状態で接続されるようになっている。電気コネクタ部１１は、コネクタ部１０の側部に設けられ、前記ビデオプロセッサ５に接続された前記信号ケーブル４が着脱自在の状態で接続可能になっている。
【００１８】
電気コネクタ部１１には内視鏡２の内部と外部とを連通する図示しない通気部が設けられている。
【００１９】
挿入部７と操作部８の接続部には、この接続部の急激な曲がりを防止する弾性部材を有する挿入部側折れ止め部材１２が設けられている。操作部８と連結コード９の接続部にも挿入部側折れ止め部材１２と同様の操作部側折れ止め部材１３が設けられている。さらに、連結コード９とコネクタ部１０の接続部にも挿入部側折れ止め部材１２と同様のコネクタ部側折れ止め部材１４が設けられている。
【００２０】
挿入部７は、基端側から順に、可撓管部１５、湾曲部１６、先端部１７を連結して構成したものである。
【００２１】
可撓管部１５は可撓性を有し柔軟に形成されている。湾曲部１６は、可撓管部１５の先端側に設けられ、操作部８の操作により湾曲可能になっている。先端部１７は、先端に設けられた後述の観察光学系、照明光学系などが配設されている。
【００２２】
図２及び図３に示すように、先端部１７には、空気・水送り口であるところの送気送水ノズル１８と、吸引口１９と、送液口２０と、観察光学系３４と、照明光学系３５とが設けられている。
【００２３】
送気送水ノズル１８は、観察光学系３４の外表面の光学部材に向けて洗浄液体や気体を噴出する。吸引口１９は、挿入部７に配設された処置具を挿通したり体腔内の液体を吸引するための処置具チャンネルの先端側の開口部である。送液口２０は、観察対象物に向けて開口しており、観察対象物に向けてた液体を噴出するための開口部になっている。
【００２４】
図１に示すように、コネクタ部１０には、気体供給口金２１と、送水タンク加圧口金２３と、液体供給口金２４と、吸引口金２５と、注入口金２６と、アース端子口金２７とが設けられている。
【００２５】
気体供給口金２１は、光源装置３に内蔵された図示しない気体供給源と着脱自在に接続するようになっている。送水タンク加圧口金２３及び液体供給口金２４は、液体供給源である送水タンク２２と着脱自在に接続するようになっている。吸引口金２５は、図３に示した前記吸引口１９より吸引を行うための図示しない吸引源と接続するようになっている。注入口金２６は図３に示した送液口２０より送水を行うための図示しない送水手段と接続するようになっている。アース端子口金２７は、高周波処置等を行うことにより内視鏡２に高周波漏れ電流が発生した場合に、漏れ電流を高周波処置装置に帰還させる。
【００２６】
操作部８には、送気送水操作ボタン２８と、吸引操作ボタン２９と、湾曲操作ノブ３０と、複数のリモートスイッチ３１と、処置具挿入口３２とが設けられている。
【００２７】
送気送水操作ボタン２８は、送気操作または送水操作を行う場合の操作部であり、術者が押圧することにより図３に示した送気送水ノズル１８から送気または送水が行えるようになっている。吸引操作ボタン２９は、吸引操作を行う場合の操作部であり、術者が押圧することにより図３に示した吸引口１９による吸引が行えるようになってている。湾曲操作ノブ３０は、前記湾曲部１６の湾曲操作を行うための操作部になっている。複数のリモートスイッチ３１は、前記ビデオプロセッサ５を遠隔操作するための操作部になっている。処置具挿入口３２は前記処置具チャンネルに連通した基端側の開口である。
【００２８】
また、内視鏡２の電気コネクタ部１１には電気コネクタ部１１を液密にシールするための防水キャップ３３が着脱自在に接続可能である。
【００２９】
次に本発明の要部となるフード部材３７について説明する。
図２及び図３に示すように、内視鏡２の挿入部７の先端部１７には、フード部材３７が着脱自在の状態で接続されている。
【００３０】
即ち、フード部材３７は、先端部１７に固定された状態で、前記先端部１７の先端面に露出した観察光学系３４の最先端レンズが体腔内壁に直接当接するのを防止し、内視鏡２の視野が失われるのを防止するためのものである。
【００３１】
フード部材３７は、シリコンゴムやフッ素ゴム等の加硫ゴム、ウレタン系エラストマー、アクリル系エラストマー、オレフイン系エラストマー等の熱可塑性エラストマー等の軟性部材やポリサルフォン等の硬質樹脂により形成することが可能である。本実施の形態では、フード部材３７は、軟性部材から形成している。
【００３２】
フード部材３７は、突出部３８と、内視鏡固定部３９とを有する。
突出部３８は、花弁状に形成されており、先端部１７より視野前方の方向に突出している。内視鏡固定部３９は、筒状に形成され、この突出部３８の基端側に設けられている。
【００３３】
内視鏡固定部３９の内径は先端部１７の外径と略同一若しくは若干小さく形成されるとともに、弾性変形可能な状態で形成されている。これにより、内視鏡固定部３９は、先端部１７が圧入可能になっている。
【００３４】
内視鏡固定部３９の基端部外周には、テーパ部４５が設けられている。テーパ部４５は、基端部の段差を少なくすると共に、基端部を薄くして弾性変形し易くすることにより、内視鏡固定部３９に対する先端部１７の圧入が容易に行えるようにしている。
【００３５】
圧入の際の締め率は、検査における体腔壁との摩擦によっては外れず、着脱の際には容易に着脱可能な固定強度になるように構成している。具体的には装脱力量が５〜２０Ｎ程度に設定している。
【００３６】
内視鏡固定部３９の長さは、先端部１７に装着した際に内視鏡固定部３９の端部が、湾曲部１６の最も先端側の回動ピン３６の位置にかからない長さの範囲でできるだけ長く形成されている。これにより、内視鏡固定部３９は、湾曲部１６の湾曲動作に影響を与えない範囲で極力先端部１７との嵌合長を長くすることで固定を確実にしている。
【００３７】
内視鏡固定部３９と突出部３８との間には、先端部１７の外径よりも小さな径に突出した先端部当接部４０が設けられている。
【００３８】
先端部１７の先端面は、先端部当接部４０に当接し、先端部１７とフード部材３７との軸方向の位置決めが行えるようになっている。尚、先端部当接部４０は全周ではなく一部にあればよい。
【００３９】
図３に示すように、先端部当接部４０には一部に内側に突出した回転方向位置決め部４１が設けられている。
【００４０】
回転方向位置決め部４１には凹状に切り欠かれたノズル係合溝４２が設けられている。ノズル係合溝４２には送気送水ノズル１８が係合し、この係合により先端部１７とフード部材３７との軸方向を回転中心とする回転方向の位置決めがなされている。
【００４１】
突出部３８の内周面側には、先端部当接部４０から突出部３８の先端側に向かって拡径するすりばち状のスロープ部４４が設けられている。これにより、突出部３８の内周面側では、先端部１７の表面に付着した水や体液、汚物などが突出部３８の外部へ流れ易く、これらが溜まり難いようになっている。
【００４２】
図３及び図４に示すように、突出部３８の先端縁部４３は、観察画像への先端縁部４３の見えが極力少なくなるように、観察光学系３４の観察視野領域に対応した形状に形成されている。
【００４３】
図５に示すように、モニタ６に表示される観察画像４６は略四角形の形状をしている。
【００４４】
このような観察画像４６を表示する場合の観察視野領域を図６に示す。
面Ａ１は、図３に示した観察光学系３４の最先端レンズ面を示し、面Ｂ１はこのレンズ面から約４ｍｍ先端側の仮想面である。
【００４５】
面Ａ１上での観察視野範囲は領域ａ１であり、面Ｂ１上での観察視野範囲は領域ｂ１である。
【００４６】
そして領域ａ１と領域ｂ１で挟まれた空間が、観察視野領域４７となる。
このとき観察視野領域４７の側方面は光線の集合から形成される斜面４８となる。
【００４７】
図５に示すように、観察画像４６における対辺方向の長さＬ１よりも対角方向の長さＬ２の方が長いため、対角方向の視野角の方が大きくなる。
【００４８】
又、内視鏡２に通常使用される観察光学系３４ではその特性上、光学系の収差によって中心よりも遠い位置ほど、像が圧縮される度合いが大きい。
【００４９】
このため、図５に示す観察画像４６の形状の場合、図６に示すように領域ｂ１の形状は観察画像４６と同一の形状とはならず、対角方向Ｘの領域が大きくなる。このことから斜面４８の形状には偏りがある。
【００５０】
図２及び図４に示すように、先端縁部４３はこの斜面４８に対応した形状に形成されており、図上、上側の先端縁部４３や、図３に示す斜線部で示した部分４３ａにはそれぞれの位置における図６に示した斜面４８の形状と略同一の形状に形成されるか、若しくは、図２及び図４に示すように、斜面４８の形状を微少量オフセットした位置に斜面部４９が形成されている。
【００５１】
尚、図３及び図４に示すように、先端縁部４３は前述した斜面４８の形状を反映して凹凸のある形状になっている。この場合、先端縁部４３は、Ａ部、Ｂ部、Ｃ部、Ｄ部が凸状となり、Ｅ部、Ｆ部、Ｇ部、Ｈ部が凹状となっている。
【００５２】
尚、突出部３８に凹部があり、凹凸が生じる場合は、観察光学系３４の近傍には凸部として突出長を長くすることが望ましい。又、凸部は３つ以上あることが望ましい。
【００５３】
凹部であるＥ部、Ｆ部、Ｇ部、Ｈ部においては前記スロープ部４４が斜面４８と連接しており、外側に向けた開口となっている。突出部３８内部に入ってしまう粘液、汚物や、送気送水ノズル１８から送水された水等はスロープ部４４を介してこれらの凹部から突出部３８の外部に排出される。これにより、汚物や粘液等によって視野が遮られることがない。
【００５４】
図４に示すように、先端縁部４３の外周側の縁部はＲ０．３〜１ｍｍ程度の面取り７１が形成されている。斜面部４９の先端側端部にもＲ０．３〜１ｍｍ程度の面取り７２が形成されている。
【００５５】
図２に示すように、観察光学系３４の観察深度は４ｍｍ〜１００ｍｍに設定されており、観察光学系３４の最先端レンズからの先端縁部４３の突出量が最も大きい位置における突出量Ｌ０は、この深度の最小値（近点）と略同等か、若しくはこの値よりも長く形成されている。本実施の形態では先端縁部４３は突出量Ｌ０が約４ｍｍとなるように突出して形成されている。
【００５６】
このような構造により、本実施の形態の内視鏡装置１は、内視鏡２の挿入部７の先端部１７に、前記内視鏡２の観察視野方向に突出する突出部３８を有するフード部材３７を設け、前記内視鏡２の観察画像４６の形状が非円形になっている。
【００５７】
また、内視鏡装置１は、前記突出部３８の先端縁部４３に前記内視鏡２の観察視野領域４７に対応した形状の斜面部４９を形成している。
【００５８】
（作用）
フード部材が透明の場合、照明光がフード部材によって遮られることがないので照明性能が良い。
【００５９】
フード部材は黒色でも良い。この場合は突出部を照明光学系の出射光の照射領域に合わせて、前記観察視野領域と同様に、突出部に切り欠き及び斜面部を設ければ良い。
【００６０】
黒色の場合は透明のものに比べて、照明光がフード部材の内壁で反射しないため、処置具を使用した時などに生じるハレーションが防止できる。
【００６１】
又、適用可能な内祝鏡とフード部材で色を合わせ、適用できないものでは色を変えても良い。又、先端部とフード部材を取り外しを容易にするためにこれらの色を異ならせて、それぞれを認識し易くしても良い。
【００６２】
尚、フード部材にこれが適用可能な内視鏡の機種名や内視鏡の先端部の外径を表示しても良い。
【００６３】
尚、突出部の突出量は２ｍｍ〜１０ｍｍ程度に設定できる。
図７及び図８は第１の実施の形態の突出部３８の作用を説明する説明図である。
【００６４】
図７において、実線には本実施の形態の突出部３８の形状を示し、破線には突出部３８の突出長を確保したままで、斜面部４９を設けずに面取り７１、７２の形状を形成する場合の突出部３８の形状を示している。破線に示すように突出部３８を形成した場合、突出部３８は肉厚が薄くなってしまう。
【００６５】
即ち、本実施の形態では、観察視野領域４８に対応した斜面部４９を設けたことで、突出部３８の突出長を短くせずに、突出部３８の肉厚を大きく形成している。これにより、本実施の形態では、突出部３８を破損し難くすることができ、突出部３８が複数の切り欠き形状を有していても、突出部３８が体腔内壁に押し当てられた際に変形するのを防止できる。また、本実施の形態では、面取り７１、７２を大きく形成できるため、挿入性が向上する。
【００６６】
図８において、実線には本実施の形態の突出部３８の形状を示し、破線には突出部３８に斜面部４９を設けずに、肉厚を確保した場合の形状を示している。破線に示すように突出部３８を形成した場合、突出部３８は突出長が短くなってしまう。
【００６７】
即ち、本実施の形態では、外径を大径化せずに突出部３８の突出長を長くすることができ、フードの性能が向上する。
【００６８】
又、粘膜が先端縁部４３に当接し、視野の全体を覆ってしまった状態でも、図２に示した先端縁部４３の突出量Ｌ０を観察光学系３４の観察深度の近点の値よりも大きくすることで、観察光学系３４は、先端縁部４３の粘膜に対してピントが合い、観察画像が明瞭となる。
【００６９】
（効果）
以上、説明したように本実施の形態によれば、細径で、フード部材３７が破損し難く、挿入性が良く、観察画像においてフード部材３７の見えが少なくて観察性能の良い内視鏡装置を提供できる。又、本実施の形態によれば、フード部材３７が粘膜に当接した場合でも、観察性能の良い内視鏡装置を提供できる。
【００７０】
尚、図１乃至図６に示した本実施の形態においては、フード部材３７の回転方向の位置を合わせるための指標を、ノズル係合溝４２を設けずに、例えば先端縁部４３に設けても良い。この時、指標を合わせる先端部１７側の目印としては、先端部１７側にも指標を付けても良いし、先端部１７の送気送水ノズル１８や吸引口１９や観察光学系３４に合わせる構成としても良い。
【００７１】
フード部材３７が内視鏡２と別体の場合には、フード部材３７の取り付け位置や、観察画像への見え方にばらつきが生じ易いが、各位置に応じた観察視野領域に対応した斜面部を設けることによって、突出長をできるだけ長く形成することにより、ばらついた場合でも、突出長を長く確保できる。
【００７２】
又、本実施の形態によれば、軸方向や回転方向の位置決め手段や、指標を設けることにより、斜面部が観察視野領域に応じた適正な位置に配置してフード部材３７を取り付けることを容易に行える。
【００７３】
（第２の実施の形態）
図９は本発明の第２の実施の形態に係る内視鏡の先端部を一部を切り欠いて示す側面図である。
【００７４】
（構成）
図９に示す第２の実施の形態で図２に示した第１の実施形態と異なるのは、フード部材１３７が先端部１７に一体に形成されていることである。
【００７５】
図９に示すように、フード部材１３７はポリサルフォン等の硬質樹脂にて形成されており、先端部１７の内部の金属部品１１７を覆う絶縁カバーを兼ねている。
【００７６】
先端部１７の観察光学系３４は、図６に示した第１の実施の形態と同様の観察視野領域４７を有している。
【００７７】
フード部材１３７の先端縁部１４３には、観察視野領域４７の斜面４８に対応した斜面部１４９が各位置に設けられている。
【００７８】
フード部材１３７の先端縁部１４３には図１乃至図６に示した第１の実施の形態と同様にそれぞれの位置における観察視野領域４７の斜面４８に対応した斜面部１４９が設けられている。
【００７９】
又、先端縁部１４３の外周側の縁部にはＲ１ｍｍ程度の面取り７１が形成されている。
【００８０】
本実施形態では斜面部１４９をなるべく広く形成し、できるかぎり先端縁部１４３の肉厚を大きく形成している
（作用）
フード部材１３７を先端部１７と一体に形成する場合には、切れや摩耗等の耐性の観点から軟質部材よりも硬質部材の方が耐久性が良くなる。
【００８１】
フード部材１３７を硬質部材で形成した場合には、軟質部材で形成した場合に比べて衝撃等によって先端縁部１４３が破損し易くなるが、第２の実施の形態では、先端縁部１４３の肉厚を厚く形成でき、面取り７１が大きなＲ形状にできるので硬質であっても十分破損し難くすることができる。
【００８２】
（効果）
以上、説明したように第２の実施の形態によれば、図１乃至図６に示した第１の実施の形態と同様の効果があるとともに、フード部材１３７を硬質部材で形成した場合にも十分破損し難くすることができる。
【００８３】
（第３の実施の形態）
図１０及び図１１は本発明の第３の実施の形態に係り、図１０は内視鏡の先端部の突出部を示す側面図、図１１はモニタに表示される観察画像を示す平面図である。
【００８４】
（構成）
図１０に示すように、本実施の形態の内視鏡の先端部に設けられたフード部材２３７の突出部２３８では、観察視野領域４７の斜面４８に対して先端縁部２４３の先端部が微少量だけ重なる形状に形成されている部分２４３ａを有している。即ち、部分２４３ａは観察視野領域４７にはみ出している。
【００８５】
そして、図６に示した対角方向Ｘの観察視野の中心から遠位値の範囲での観察視野領域４７に対する先端縁部２４３の重なり量ｘはその他の位置での重なり量ｙよりも大きく形成されている。即ち、図１１に示すように、重なり量ｘ、ｙは、観察光学系３４の収差を考慮して、観察画像４６上での先端縁部２４３の見える量が均一になるように形成されている。
【００８６】
（作用）
本実施の形態において、図６に示した対角方向Ｘの観察視野の中心より遠位値の範囲では、観察光学系３４の収差により、最も像が圧縮される。このため、図１１に示すように、モニタ６の観察画像４６では、対角方向Ｘの斜面４８から突出して観察視野領域４７に重なった先端縁部２４３の像２４３ｂ，２４３ｃは圧縮される。これにより、先端縁部２４３の像２４３ｂ，２４３ｃは、その他の位置において観察視野領域４７に重なった先端縁部２４３の像２４３ｄと観察画像４６上での見え方に大きな差はなくなる。
【００８７】
このため、観察視野への影響を最小にしてフード部材２３７の突出長もしくは肉厚を大きく形成できるようになる。
【００８８】
（効果）
以上、説明したように本実施の形態によれば、図１乃至図６に示した実施の形態と同様の効果があるとともに、更にフード部材２３７の突出長を長くもしくは肉厚を大きく形成して、挿入性もしくは耐久性の良い内視鏡装置を提供できる。
【００８９】
（第４の実施の形態）
図１２は本発明の第４の実施の形態に係るモニタに表示される観察画像を示す平面図である。第４の実施の形態に係る内視鏡の先端部の突出部の形状は、図１０を代用して説明する。
【００９０】
（構成）
本実施の形態では、対角方向Ｘの観察視野の中心から遠位値の範囲でのみ図１０に示す観察視野領域４７の斜面４８に対して先端縁部２４３の先端部が微少量だけ重なる形状に形成されている部分を有している。これにより、図１２に示すように、モニタ６の観察画像４６では、対角方向Ｘの斜面４８から突出して観察視野領域４７に重なった先端縁部２４３の像２４３ｂ，２４３ｃ，２４３ｅが表示される。
【００９１】
（作用）
本実施の形態において、モニタ６の観察画像４６では、圧縮率が高く、画角の大きい対角方向Ｘの部分の視野は若干小さくなってしまうが、圧縮率が低く、元々画角の小さい他の部分の視野を更に小さくすることなく、フード部材２３７の突出長もしくは肉厚を大きく形成できるようになる。
【００９２】
（効果）
以上、説明したように第４の実施の形態によれば、図１０及び図１１に示した第３の実施の形態と同様の効果があるとともに、更に観察性能の良い内視鏡装置を提供できる。
【００９３】
第１の実施の形態から第４の実施の形態においては、観察画像の形状が非円形のものとして、図１３、図１４、図１５、図１６に示すような観察画像を有する内視鏡装置において適用できる。
【００９４】
図１３：観察画像４６は正方形又は長方形で、角部に丸められている略四角形
図１４：モニタ６の画面全体に観察画像４６が表示される四角形
図１５：円形の上下を切り取った形状の略四角形
図１６：円形の上下、左右を切り取った形状の略四角形
（第５の実施の形態）
図１７乃至図２０は本発明の第５の実施の形態に係り、図１７はフード部材を示す断面図、図１８はフード部材を取り付けたフード部材装着具を示す断面図、図１９は図１８のフード部材装着具を用いてフード部材を内視鏡の先端部に取り付けた状態を示す断面図、図２０は図１９の状態からフード部材装着具を取り外した状態を示す断面図である。
【００９５】
（構成）
図１７に示すように、フード部材５０は、略円筒状であり、内視鏡の先端部に着脱自在になっている。フード部材５０は、シリコンゴムやフッ素ゴム等の加硫ゴム、ウレタン系エラストマー、アクリル系エラストマー、オレフィン系エラストマー等の熱可塑性エラストマー等の軟性部材やポリサルフォン等の硬質樹脂により形成することが可能である。本実施の形態ではフード部材５０は、軟性部材から形成している。
【００９６】
フード部材５０には突出部５１と内視鏡固定部５２とが設けられている。
フード部材５０の内視鏡固定部５２の内径は、図１９に示す内視鏡の先端部１７の外径と略同一、若しくは若干小さく形成されている。これにより、内視鏡固定部５２は、弾性変形により先端部１７が圧入可能に形成されている。
【００９７】
図１８に示すように、フード部材装着具５３は、内視鏡の挿入部の先端部１７に着脱自在なフード部材５１を装着するためものである。
【００９８】
フード部材装着具５３には、フード部材固定部５４と把持部５５とが設けられている。
【００９９】
フード部材固定部５４の外径は突出部５１の内径と略同一に形成されている。これにより、フード部材固定部５４は突出部５１が外嵌可能になっている。
【０１００】
フード部材固定部５４の基端部にはフード部材当接部５６が設けられている。フード部材固定部５４の先端側には先端部当接部５７が設けちれている。
【０１０１】
フード部材当接部５６と先端部当接部５７との間の長さＬ１１は、先端部１７にフード部材５０を装着した際に、観察視野に見えるフード部材５０の量が許容でき、かつ、図２０に示すフード部材５０の効果が最大となるような最適な先端部１７からの突出部５１の突出量Ｌ１２と同量に設定されている。
このような構造により、フード部材当接部５６は、前記フード部材５０の位置を規制するフード部材規制手段となり、先端部当接部５７は、前記先端部１７の位置を規制する先端部規制手段となり、フード部材装着具５３は、前記フード部材５０を前記先端部に装着する場合に、前記先端部１７に対する前記フード部材５０の装着位置を規制する。
【０１０２】
（作用）
フード部材５０の先端部１７への装着の際には、図１８に示すようにフード部材５０の突出部５１にフード部材装着具５３のフード部材固定部５４を挿入し、フード部材当接部５６と突出部５１の先端部とが突き当たるまで挿入する。
【０１０３】
次に、図１９に示すようにフード部材５０の内視鏡固定部５２に先端部１７を圧入し、先端部当接部５７と先端部１７とが突き当たるまで挿入する。
【０１０４】
先端部当接部５７と先端部１７とが突き当り、フード部材当接部５６と突出部５１の先端部とが突き当たったら、図２０に示すようにフード部材５０からフード部材装着具５３を取り外す。
【０１０５】
又、以下の順序で装着しても良い。
先ず、フード部材５０の内視鏡固定部５２に先端部１７を適当量圧入する。この後、フード部材５０の突出部５１にフード部材装着具５３のフード部材固定部５４を挿入する。
【０１０６】
次に、フード部材当接部５６と突出部５１の先端部とが突き当るとともに先端部当接部５７と先端部１７とが突き当るように、フード部材５０の位置を調整した後、フード部材装着具５３を取り外す。
【０１０７】
以上により、図２０に示すように、フード部材５０は先端部１７に対する適正な突出量Ｌ１２となる位置に軸方向の位置が規定されて先端部１７に固定される。
【０１０８】
（効果）
以上、説明したように第５の実施の形態によれば、確実かつ容易にフード部材５０の軸方向の位置を規定して先端部１７に装着でき、観察性能が良く、フード部材の装着が容易なフード部材装着具５３を提供できる。
【０１０９】
(第６の実施の形態)
図２１は本発明の第６の実施の形態に係るフード部材装着具を用いたフード装着方法を示す説明図である。
【０１１０】
（構成）
図２１に示すように、３種類の内視鏡２ａ、２ｂ、２ｃはそれぞれの先端部１７ａ、１７ｂ、１７ｃの外径が略同一である。
【０１１１】
一方、これらは先端部１７ａ、１７ｂ、１７ｃは、図２に示した観察光学系３４、照明光学系３５、送気送水ノズル１８、吸引口１９等のレイアウトが異なっている。
【０１１２】
又、観察光学系３４を構成する図示しないレンズの構成やＣＣＤの違いや、ビデオプロセッサ５の制御によるモニタ６の観察画像４６の表示形状などの違いによって、図１に示したモニタ６に表示される観察画像の観察視野領域がそれぞれ異なっている。
【０１１３】
このため、一種類のフード部材５０ａを３種類の先端部１７ａ、１７ｂ、１７ｃに取り付けた際に、突出部５１の先端部１７からの突出量が同じ場合には、それぞれ観察画像に見えるフード部材５０ａの量が異なってしまう。
【０１１４】
一方、フード部材５０ａは内視鏡２ａ、２ｂ、２ｃのそれぞれに共通して使用可能である。
【０１１５】
フード部材５０ａを先端部１７ａ、１７ｂ、１７ｃに取り付けた際に、観察画像に見えるフード部材５０の量が許容でき、かつ、フード部材の効果が最大となるような最適な突出量Ｌ１２は内視鏡２ａ、２ｂ、２ｃとの組み合わせにおいて固有にある。これをそれぞれＬ１２ａ、Ｌ１２ｂ、Ｌ１２ｃとする。
【０１１６】
これらの内視鏡２ａ、２ｂ、２ｃにフード部材５０ａを装着する際には、それぞれ専用のフード部材装着具５３ａ、５３ｂ、５３ｃを使用する。
【０１１７】
フード部材装着具５３ａ、５３ｂ、５３ｃのフード部材当接部５６と先端部当接部５７との間の長さＬ１１ａ、Ｌ１１ｂ、Ｌ１１ｃは、それぞれ前記突出量Ｌ１２ａ、Ｌ１２ｂ、Ｌ１２ｃと同量に形成されている。
【０１１８】
把持部５５にはそれぞれの内視鏡の名称や型番、フード部材５０ａの名称や型番、メーカー名等が成形や印刷等によって表示された表示部５８ａ、５８ｂ、５８ｃが設けられている。
【０１１９】
（作用）
フード部材５０ａを装着する装着の際には、表示５８の内容を確認して、各内視鏡に対応したフード部材装着具を選択する。
【０１２０】
装着の手順は図２０に示した第５の実施の形態と同様である。
各内視鏡２ａ、２ｂ、２ｃにおいて、フード部材５０ａは先端部１７ａ、１７ｂ、１７ｃに対して、それぞれ適正な突出量Ｌ１２ａ、Ｌ１２ｂ、Ｌ１２ｃに軸方向の位置が規定されて固定される。
【０１２１】
（効果）
このような第６の実施の形態によれば、図１７乃至図２０に示した第５の実施の形態と同様の効果に加え、共通のフード部材を、異なる内視鏡の先端部のそれぞれにおいて最適な位置に装着することができる。
【０１２２】
(第７の実施の形態)
図２２は本発明の第７の実施の形態に係るフード部材装着具を用いてフード部材を内視鏡の先端部に取り付けた状態を示す断面図である。図２２においては、図１９の実施の形態と同様の構成要素には同じ符号を付して説明を省略している。
【０１２３】
（構成）
図２２に示すように、フード部材装着具３５３には円筒状の外径規制部５９が設けられている。
【０１２４】
外径規制部５９の内径Ｄ１はフード部材５０の突出部５１の外径Ｄ２と略同一であり、外径規制部５９は突出部５１が挿入可能に形成されている。
【０１２５】
（作用）
フード部材５０をフード部材装着具３５３に装着する際には、フード部材５０の突出部５１をフード部材固定部５４と外径規制部５９との間に挿入する。
【０１２６】
次に、図１９の場合と同様に、フード部材５０の内視鏡固定部５２に先端部１７を圧入し、この後、フード部材５０からフード部材装着具３５３を取り外す。これにより図２０の場合と同様に、フード部材５０は先端部１７に取り付け固定される。
【０１２７】
図２３はフード部材５０の軸方向を反対方向に間違えてフード部材装着具３５３に装着してから先端部１７に装着しようとした場合の作用を説明する説明図である。
【０１２８】
図２３に示すように、本来とは逆にフード部材５０の内視鏡固定部５２をフード部材固定部５４と外径規制部５９との間に挿入する。
【０１２９】
この状態では、次に、フード部材５０の突出部５１に先端部１７を圧入しようとしても、突出部５１の内径は内視鏡固定部５２の内径や先端部１７の外径よりも小さく、かつ、外径規制部５９により突出部５１の変形が規制されるため、突出部５１は拡径することができず、先端部１７を圧入することができなくなる。
【０１３０】
これにより、フード部材５０を本来とは逆に先端部１７に装着するのを防止できる。
【０１３１】
図２４は、フード部材５０の軸方向を反対方向に間違えてフード部材５０を先端部１７に先に装着しようとした場合の作用を説明する説明図である。
【０１３２】
図２４に示すように、フード部材５０の突出部５１に先端部１７を適当量圧入する。
【０１３３】
この時、突出部５１の内径は先端部１７の外径に対して適正ではないが、フード部材５０は弾性変形して拡径して装着されてしまう可能性がある。
【０１３４】
次に、フード部材５０の内視鏡固定部５２にフード部材装着具３５３のフード部材固定部５４を挿入しようとすると、フード部材５０の内視鏡固定部５２は拡径して変形しているため、外径規制部５９に突き当たり、挿入することができない。
【０１３５】
これにより、フード部材５０を本来とは逆の方向で先端部１７に装着するのを防止できる。
【０１３６】
（効果）
このような第７の実施の形態によれば、図１７乃至図２０に示した第５の実施の形態と同様の効果に加え、フード部材の軸方向を逆にして誤装着することを防止できる。
【０１３７】
（第８の実施の形態）
図２５及び図２６は本発明の第８の実施の形態に係り、図２５はフード部材を取り付けたフード部材装着具の閉じた状態を示す断面図、図２６はフード部材装着具を開いた状態を示す斜視図である。
【０１３８】
（構成）
図２５及び図２６に示すように、フード部材装着具４５３はフード部材５０の梱包容器を兼ねている。
【０１３９】
フード部材装着具４５３は本体部６２と、蓋状の収容部６３と、これらを繋ぐヒンジ部６４を有している。
【０１４０】
又、フード部材装着具４５３は、エチレンオキサイドガス滅菌、オートクレーブ滅菌やガンマ線滅菌等の滅菌処理が可能な樹脂部材にて形成されている。例えば、フード部材装着具４５３は、エチレンオキサイドガス滅菌が可能なポリスチレンにて形成されている。
【０１４１】
本体部６２には、図１８に示したものと同様のフード部材固定部５４が設けられており、予めフード部材５０が固定されている。
【０１４２】
フード部材固定部５４の外径は突出部５１の内径よりも若干大きく形成されており、フード部材固定部５４は突出部５１に圧入されている。突出部５１は自身の弾性力によりフード部材固定部５４に固定されている。フード部材固定部５４の外径は、突出部５１とフード部材固定部５４との固定力が内視鏡固定部５２と図１９に示した先端部１７との固定力よりも小さくなるように寸法設定されている。又、本体部６２には図１９に示したものと同様のフード部材当接部５６、先端部当接部５７が設けられている。
【０１４３】
本体部６２には、凸部６５が設けられ、収容部６３には凸部６５を着脱自在に係止する係止部６６が設けられている。
【０１４４】
フード部材装着具４５３は、凸部６５は係止部６６に係合して係止されることにより、本体部６２と収容部６３が係止され、これらにより図２５に示すようにフード部材５０を収容している。
【０１４５】
フード部材装着具４５３は、上述した滅菌処理が可能で、一定期間内容物の滅菌状態を保つことが可能なピールパック等に収容されており、この状態で滅菌処理されてユーザーに届けられる。
【０１４６】
（作用）
フード部材５０を図１９に示した先端部１７に装着する際には、ピールパックを開封して図２５に示す状態のフード部材装着具４５３を取り出し、図２６に示すように本体部６２と収容部６３の係止を外してフード部材５０を露出させる。フード部材装着具４５３により、この時までフード部材５０の滅菌状態が保たれる。
【０１４７】
次に、内視鏡固定部５２に図１９に示した先端部１７を挿入して、第５の実施の形態と同様にしてフード部材５０を先端部１７に位置決め固定し、フード部材装着具４５３をフード部材５０から外す。この際には、フード部材固定部５４の外径が突出部５１とフード部材固定部５４との固定力が内視鏡固定部５２と先端部１７との固定力よりも小さくなるように寸法設定されているので、フード部材５０を手指で把持しなくても、フード部材５０と先端部１７との位置がずれることなくフード部材５０からフード部材装着具４５３を外すことができる。
【０１４８】
以上により、フード部材５０を手指でフード部材装着具４５３から取り外すことなく、また、フード部材５０に触れることなく先端部１７に装着する。
【０１４９】
（効果）
このような第８の実施の形態によれば、図１７乃至図２０に示した第５の実施の形態と同様の効果に加え、検査前にフード部材をフード部材装着具に取り付ける手間が省け、更に容易に装着が行える。また、予めフード部材がフード部材装着具に固定されているので、フード部材の軸方向を逆に誤装着することを防止できる。さらに、内視鏡の使用直前までフード部材を容易に清潔に保つことができる。
【０１５０】
（第９の実施の形態）
図２７は本発明の第９の実施の形態に係るフード部材装着具を用いてフード部材を内視鏡の先端部に取り付けた場合の状態を示す説明図である。
【０１５１】
（構成）
図２７に示すように、フード部材６７の突出部５５１の先端側の先端当接部６８の稜線は観察画像に合わせた花弁型の形状に形成されている。
【０１５２】
フード部材装着具６９のフード部材固定部５５４の基端側には先端当接部６８と略同一の形状を有するフード部材当接部５５６が設けられている。
【０１５３】
フード部材固定部５５４の先端側には先端部当接部５５７が設けられている。フード部材固定部５５４には先端部当接部５５７から突出した円柱状の回転方向規制部７０が設けられている。
【０１５４】
回転方向規制部７０の外径は先端部１７に設けられた吸引口１９の内径と略同一で、吸引口１９に嵌合可能に形成されている。
【０１５５】
（作用）
フード部材６７をフード部材装着具６９に装着する際には、フード部材６７の先端当接部６８が、先端当接部６８と略同形状のフード部材当接部５５６に対応した位置になるようにして、先端当接部６８とフード部材当接部５５６とを当接させる。これにより、フード部材装着具６９に対するフード部材６７の回転方向の位置を所定の位置にする。
【０１５６】
次に、内視鏡２の吸引口１９と回転方向規制部７０が嵌合するようにフード部材装着具６９と先端部１７との回転方向の位置を合わせて、先端部１７と先端部当接部５５７とを当接させた位置でフード部材６７を先端部１７に固定する。
【０１５７】
これにより、フード部材当接部５５６によってフード部材６７とフード部材装着具６９との回転方向の位置が規制されるとともに軸方向の位置も規制される。
【０１５８】
一方、内視鏡固定部５５２と先端部１７との嵌合と回転方向規制部７０と吸引口１９との嵌合によって、これらの回転方向の位置が規制される。又、先端部当接部５５７と先端部１７の当接によって、これらの軸方向の位置が規制される。
【０１５９】
以上により、先端当接部６８は、先端部１７に対する適正な突出量Ｌ３１となる位置に軸方向の位置が規定され、かつ観察画像に対応した状態に回転方向の位置が規制して装着される。
【０１６０】
（効果）
このような第９の実施の形態によれば、確実かつ容易に先端当接部６８の軸方向及び回転方向の位置を規定して先端部１７に装着でき、観察性能が良く、フード部材の装着が容易なフード部材装着具が提供できる。
【０１６１】
尚、前記回転方向規制部７０は、吸引口１９と係合させて回転方向の規制を行う構成としたが、回転方向規制部７０としては、先端部１７の先端面に突出した送気送水ノズル１８に係合する回転方向規制部を設けても良く、このように先端部１７の先端面の中心以外の位置に設けられた吸引口１９のような凹部、若しくは送気送水ノズル１８のような凸部に係合する回転位置規制部を設ければ良い。
【０１６２】
これにより回転方向の位置を規制する規制部を先端部１７の外周部に設けなくて良く、複雑な規制部を新たに設けなくてよいため、細径となる。
【０１６３】
又、内視鏡２側には、位置決めのための新たな構成は必要ないので、既存の内視鏡２にも適用でき、汎用性が高い。
【０１６４】
尚、凹部や凸部を先端部１７に吸引口１９や送気送水ノズル１８とは別に設けても良い。尚、フード部材装着具６９は、第８の実施の形態のように構成しても良い。
【０１６５】
［付記］
以上詳述したような本発明の上記実施の形態によれば、以下の如き構成を得ることができる。
【０１６６】
（付記項１） 内視鏡の挿入部先端部に、前記内視鏡の観察視野方向に突出する突出部を有するフード部材を設け、前記内視鏡の観察画像の形状が非円形の内視鏡装置において、
前記突出部の先端縁部に前記内視鏡の観察視野領域に対応した形状の斜面部を形成したことを特徴とする内視鏡装置。
【０１６７】
（付記項２） 前記突出部は少なくとも一つの切り欠き部を有することを特徴とする付記項１に記載の内視鏡装置。
【０１６８】
（付記項３） 前記観察画像の中心から遠位置の範囲の少なくとも一部における前記突出部の前記観察視野領域への重なり量を、その他の範囲における前記突出部の前記観察視野領域への重なり量よりも大きく形成したことを特徴とする付記項１及び２のいずれか一に記載の内視鏡装置。
【０１６９】
（付記項４） 前記観察画像の形状が略四角形であり、前記観察画像の少なくとも１つの角部近傍の範囲における前記突出部の前記観察視野領域への重なり量を、前記観察画像の辺部近傍の範囲における前記突出部の前記観察視野領域への重なり量よりも大きく形成したことを特徴とする付記項３に記載の内視鏡装置。
【０１７０】
（付記項５） 前記観察画像の少なくとも１つの角部近傍の範囲においては前記突出部を前記観察視野領域に入れて、前記観察画像の辺部近傍の範囲においては前記突出部を前記観察視野領域に入らない形状に前記突出部を形成したことを特徴とする付記項４に記載の内視鏡装置。
【０１７１】
（付記項６） 前記突出部の前記観察光学系の最先端レンズ面からの最大突出量は、前記観察光学系の最小観察深度以上の長さに形成したことを特徴とする付記項１乃至５のいずれか一に記載の内視鏡装置。
【０１７２】
（付記項７） 前記フード部材が前記内視鏡の先端部と着脱自在に形成されていることを特徴とする付記項１乃至６のいずれか一に記載の内視鏡装置。
【０１７３】
（付記項８） 前記フード部材が前記内視鏡の先端部と着脱自在に形成され、これらの位置決めを行う位置決め手段を設けたことを特徴とする付記項７に記載の内視鏡装置。
【０１７４】
（付記項９） 前記フード部材が前記内視鏡の先端部と着脱自在に形成され、これらの固定位置を示す指標を設けたことを特徴とする付記項７に記載の内視鏡装置。
【０１７５】
（付記項１０） 内視鏡の挿入部の先端部に着脱自在なフード部材を装着するためのフード部材装着具において、
前記フード部材の位置を規制するフード部材規制手段と、
前記先端部の位置を規制する先端部規制手段と、
を具備し、前記フード部材を前記先端部に装着する場合に、前記先端部に対する前記フード部材の装着位置を規制することを特徴とするフード部材装着具。
【０１７６】
（付記項１１） 前記フード部材規制手段は前記フード部材の軸方向の位置を規制するフード部材軸方向規制部を有し、前記先端部規制手段は前記先端部の前記軸方向の位置を規制する先端部軸方向規制部を有することを特徴とする付記項１０に記載のフード部材装着具。
【０１７７】
（付記項１２） 前記フード部材規制手段は前記フード部材の回転方向の位置を規制するフード部材回転方向規制部を有し、前記先端部規制手段は前記先端部の前記回転方向の位置を規制する先端部回転方向規制部を有することを特徴とする付記項１０及び１１のいずれか一に記載のフード部材装着具。
【０１７８】
（付記項１３） 前記先端部回転方向規制部は前記先端部の先端面に設けられた凹部または凸部の何れかと係合する係合部であることを特徴とする付記項１２に記載のフード部材装着具。
【０１７９】
（付記項１４） 前記先端部回転方向規制部は前記先端部に開口した吸引口または前記先端部に突出した流体噴出ノズルと係合する係合部であることを特徴とする付記項１３に記載のフード部材装着具。
【０１８０】
（付記項１５） 前記フード部材を収容するフード収容部を具備することを特徴とする付記項１０乃至１４のいずれか一に記載のフード部材装着具。
【０１８１】
（付記項１６） 前記フード部材を着脱自在に固定するフード部材固定部を具備する付記項１０乃至１５のいずれか一に記載のフード部材装着具。
【０１８２】
【発明の効果】
以上述べたように本発明によれば、内視鏡の挿入部の先端部に容易且つ正確にフード部材を装着できるという効果を有する。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態に係る内視鏡装置の全体構成を示す説明図。
【図２】図１の第１の実施の形態の先端部の断面図。
【図３】図１の第１の実施の形態の内視鏡の先端部の正面図。
【図４】図１の第１の実施の形態の内視鏡の先端部に着脱自在に接続されるフード部材を示す側面図。
【図５】図１の第１の実施の形態のモニタに表示される観察画像を示す平面図。
【図６】図５の観察画像を表示する場合の観察視野領域を示す説明図。
【図７】図１の第１の実施の形態の突出部の作用を説明する第１の説明図。
【図８】図１の第１の実施の形態の突出部の作用を説明する第２の説明図。
【図９】本発明の第２の実施の形態に係る内視鏡の先端部を一部を切り欠いて示す側面図。
【図１０】本発明の第３の実施の形態に係る内視鏡の先端部の突出部を示す側面図。
【図１１】図１０の第３の実施の形態のモニタに表示される観察画像を示す平面図。である。
【図１２】本発明の第４の実施の形態に係る内視鏡装置のモニタに表示される観察画像を示す平面図。
【図１３】第１の実施の形態から第４の実施の形態に用いることが可能な形状が非円形の観察画像の第１の例を示す平面図。
【図１４】第１の実施の形態から第４の実施の形態に用いることが可能な形状が非円形の観察画像の第２の例を示す平面図。
【図１５】第１の実施の形態から第４の実施の形態に用いることが可能な形状が非円形の観察画像の第３の例を示す平面図。
【図１６】第１の実施の形態から第４の実施の形態に用いることが可能な形状が非円形の観察画像の第４の例を示す平面図。
【図１７】本発明の第５の実施の形態に係るフード部材装着具で用いるフード部材を示す断面図。
【図１８】本発明の第５の実施の形態に係るフード部材装着具を示す断面図。
【図１９】図１８のフード部材装着具を用いてフード部材を内視鏡の先端部に取り付けた状態を示す断面図。
【図２０】図１９の状態からフード部材装着具を取り外した状態を示す断面図。
【図２１】本発明の第６の実施の形態に係るフード部材装着具を用いたフード装着方法を示す説明図。
【図２２】本発明の第７の実施の形態に係るフード部材装着具を用いてフード部材を内視鏡の先端部に取り付けた状態を示す断面図。
【図２３】図２２の第７の実施の形態においてフード部材の軸方向を反対方向に間違えてフード部材装着具に装着した場合の作用を説明する説明図。
【図２４】図２２の第７の実施の形態においてフード部材の軸方向を反対方向に間違えてフード部材装着具に装着した場合の作用を説明する説明図。
【図２５】本発明の第８の実施の形態に係るフード部材装着具を示す断面図。
【図２６】図２５のフード部材装着具を開いた状態を示す斜視図。
【図２７】本発明の第９の実施の形態に係るフード部材装着具を用いてフード部材を内視鏡の先端部に取り付けた場合の状態を示す説明図。
【符号の説明】
１ …内視鏡装置
２ …内視鏡
３ …光源装置
４ …信号ケーブル
５ …ビデオプロセッサ
６ …モニタ
７ …挿入部
１７ …先端部
３４ …観察光学系
３７ …フード部材
３８ …突出部
３９ …内視鏡固定部
４３ …先端縁部
４７ …観察視野領域
４８ …斜面
４９ …斜面部
５０ …フード部材
５３ …フード装着具
５６ …フード部材当接部
５７ …先端部当接部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hood member attachment tool used when a hood member is attached to a distal end portion of an endoscope insertion portion.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an example of an endoscope apparatus used for surgery, there is one in which an objective lens, a light guide, an air / water feed port, and a suction port are disposed at the distal end portion of an insertion portion of an endoscope. In such an endoscope apparatus, light such as a living tissue is irradiated from a light guide, the object irradiated with light is visually recognized through an objective lens, and air or water sent from an air / water feed port, or other The substance can be sucked through the suction port.
[0003]
By the way, for example, when trying to insert an endoscope into the stomach, the gastric mucosa often touches the objective lens provided at the distal end of the insertion portion of the endoscope, and the tip is often invisible. .
[0004]
Corresponding to this, Japanese Patent Laid-Open No. 11-206702 discloses an inner portion provided with a guide portion for preventing the mucous membrane from covering the objective lens and losing the visual field at the distal end portion of the insertion portion of the endoscope. A tip structure of an endoscope is disclosed. The guide portion of the distal end structure of the endoscope is a hood-like member, and the inner peripheral surface is formed in an expanded shape by drawing a round from the distal end surface of the distal end portion.
[0005]
However, in the structure described in Japanese Patent Application Laid-Open No. 11-206702, if the protrusion of the guide portion is long, the objective lens is close to the guide portion, or the viewing angle that has become widespread in recent years is wide and the shape of the observation field of view In the case of a video scope having a non-circular shape and a viewing angle different depending on the direction, the guide portion can be seen in the field of view and the observation performance is lowered. On the other hand, if the protrusion length of the guide portion is shortened so that the guide portion does not enter the field of view, the effect of preventing the mucous membrane from covering the objective lens cannot be sufficiently obtained, and the insertability and observation performance are deteriorated. .
[0006]
[Problems to be solved by the invention]
In the endoscope apparatus in which the hood member is detachably provided at the distal end portion of the endoscope, when the hood member is attached to the distal end portion of the endoscope, when the amount of pushing into the hood member at the distal end portion is insufficient, The hood member protrudes from the normal position, and the amount of the hood member visible in the observation field increases. On the other hand, when the hood member is mounted so that the protruding length is shorter than the normal position, the effect of the hood member is reduced. In order to prevent this, even if the hood member is provided with an axial positioning portion, if the hood member is formed of a soft material, the positioning portion will be deformed at the time of mounting, There were many cases where it was not possible to install in position.
[0007]
Further, in the endoscope apparatus in which the hood member is formed detachably at the distal end portion of the endoscope, the rotation direction of the hood member is different from the normal position when the hood member is formed in a shape matching the visual field. There is a possibility that the hood member may be attached to the position, and the amount of the hood member entering the observation visual field may increase.
[0008]
In order to solve such a problem, if a hood member positioning mechanism is provided at the distal end portion of the endoscope insertion portion, there is a problem that the distal end portion of the endoscope insertion portion is complicated and enlarged.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hood member mounting tool that allows a hood member to be easily and accurately mounted on the distal end portion of an insertion portion of an endoscope.
[0010]
[Means for Solving the Problems]
In order to achieve the object, the hood member mounting tool according to claim 1 is a hood member mounting tool for mounting a detachable hood member at a distal end portion of an insertion portion of an endoscope, and restricts the position of the hood member. And a hood member restricting means for restricting the position of the distal end portion of the insertion portion. When the hood member is attached to the distal end portion of the insertion portion, the hood with respect to the distal end portion of the insertion portion is provided. The mounting position of the member is regulated.
[0011]
The hood member mounting tool according to claim 2, wherein the hood member restriction means has a hood member axial direction restriction portion for restricting an axial position of the hood member, and the tip portion restriction means is a tip of the insertion portion. It has a front-end | tip part axial direction control part which controls the position of the said axial direction of a part.
[0012]
The endoscope apparatus according to claim 3, wherein the hood member restricting unit includes a hood member rotation direction restricting portion that restricts a position of the hood member in the rotation direction, and the distal end portion restricting unit is the distal end of the insertion portion. It has the front-end | tip part rotation direction control part which controls the position of the said rotation direction of a part, It is characterized by the above-mentioned.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1 to 6 relate to a first embodiment of the present invention, FIG. 1 is an explanatory view showing the overall configuration of the endoscope apparatus, FIG. 2 is a sectional view of the distal end portion of the endoscope, and FIG. 4 is a front view of the distal end portion of the endoscope, FIG. 4 is a side view showing a hood member detachably connected to the distal end portion of the endoscope, FIG. 5 is a plan view showing an observation image displayed on the monitor, and FIG. It is explanatory drawing which shows the observation visual field area | region in the case of displaying the observation image of FIG.
[0014]
(Constitution)
FIG. 1 shows the overall configuration of the endoscope apparatus.
As shown in FIG. 1, the endoscope apparatus 1 includes an endoscope 2, a light source device 3, a video processor 5, and a monitor 6.
[0015]
The endoscope 2 includes an imaging unit described later. The light source device 3 is detachably connected to the endoscope 2 and supplies illumination light to a light guide provided in the endoscope 2. The video processor 5 is connected to the endoscope 2 via the signal cable 4 to control the imaging unit of the endoscope 2 and processes a signal obtained from the imaging unit. The monitor 6 displays a video corresponding to the subject image output from the video processor 5.
[0016]
The endoscope 2 includes an insertion portion 7, an operation portion 8, a connection cord 9, a connector portion 10, and an electrical connector portion 11.
[0017]
The insertion part 7 has flexibility and is formed in an elongated shape. The operation unit 8 is connected to the proximal end side of the insertion unit 7. The connection cord 9 has flexibility and extends from the side of the operation unit 8. The connector part 10 is provided at the end of the connecting cord 9 and is connected to the light source device 3 in a detachable state. The electrical connector portion 11 is provided on the side portion of the connector portion 10 so that the signal cable 4 connected to the video processor 5 can be connected in a detachable state.
[0018]
The electrical connector portion 11 is provided with a ventilation portion (not shown) that communicates the inside and the outside of the endoscope 2.
[0019]
The connecting portion between the insertion portion 7 and the operation portion 8 is provided with an insertion portion-side bending preventing member 12 having an elastic member that prevents a sudden bending of the connecting portion. The connecting portion between the operating portion 8 and the connecting cord 9 is also provided with an operating portion side folding member 13 similar to the insertion portion side folding member 12. Further, the connecting portion between the connecting cord 9 and the connector portion 10 is provided with a connector portion side folding preventing member 14 similar to the insertion portion side folding preventing member 12.
[0020]
The insertion portion 7 is configured by connecting the flexible tube portion 15, the bending portion 16, and the distal end portion 17 in order from the proximal end side.
[0021]
The flexible tube portion 15 has flexibility and is formed softly. The bending portion 16 is provided on the distal end side of the flexible tube portion 15 and can be bent by the operation of the operation portion 8. The distal end portion 17 is provided with a later-described observation optical system, illumination optical system, and the like provided at the distal end.
[0022]
As shown in FIGS. 2 and 3, the distal end portion 17 has an air / water feeding nozzle 18, which is an air / water feeding port, a suction port 19, a liquid feeding port 20, an observation optical system 34, and an illumination. An optical system 35 is provided.
[0023]
The air / water supply nozzle 18 ejects cleaning liquid and gas toward the optical member on the outer surface of the observation optical system 34. The suction port 19 is an opening on the distal end side of the treatment instrument channel for inserting the treatment instrument disposed in the insertion portion 7 and sucking the liquid in the body cavity. The liquid supply port 20 is open toward the observation object, and is an opening for ejecting the liquid toward the observation object.
[0024]
As shown in FIG. 1, the connector unit 10 is provided with a gas supply base 21, a water supply tank pressurization base 23, a liquid supply base 24, a suction base 25, an injection base 26, and a ground terminal base 27. It has been.
[0025]
The gas supply base 21 is detachably connected to a gas supply source (not shown) built in the light source device 3. The water supply tank pressure cap 23 and the liquid supply cap 24 are detachably connected to a water supply tank 22 which is a liquid supply source. The suction cap 25 is connected to a suction source (not shown) for performing suction from the suction port 19 shown in FIG. The inlet gold 26 is connected to a water supply means (not shown) for supplying water from the liquid supply port 20 shown in FIG. The ground terminal base 27 returns the leakage current to the high frequency treatment device when a high frequency leakage current is generated in the endoscope 2 by performing a high frequency treatment or the like.
[0026]
The operation unit 8 includes an air / water supply operation button 28, a suction operation button 29, a bending operation knob 30, a plurality of remote switches 31, and a treatment instrument insertion port 32.
[0027]
The air / water supply operation button 28 is an operation unit for performing an air supply operation or a water supply operation. When the operator presses the air / water supply operation button 28, air or water can be supplied from the air / water supply nozzle 18 shown in FIG. 3. ing. The suction operation button 29 is an operation unit for performing a suction operation, and can be sucked by the suction port 19 shown in FIG. 3 when pressed by an operator. The bending operation knob 30 is an operation unit for performing the bending operation of the bending portion 16. The plurality of remote switches 31 are operation units for remotely operating the video processor 5. The treatment instrument insertion port 32 is an opening on the base end side communicating with the treatment instrument channel.
[0028]
Further, a waterproof cap 33 for sealing the electrical connector portion 11 in a liquid-tight manner can be detachably connected to the electrical connector portion 11 of the endoscope 2.
[0029]
Next, the hood member 37 which is a main part of the present invention will be described.
As shown in FIGS. 2 and 3, a hood member 37 is detachably connected to the distal end portion 17 of the insertion portion 7 of the endoscope 2.
[0030]
That is, the hood member 37 prevents the state-of-the-art lens of the observation optical system 34 exposed from the distal end surface of the distal end portion 17 from directly contacting the inner wall of the body cavity while being fixed to the distal end portion 17. This is to prevent the loss of the second field of view.
[0031]
The hood member 37 can be formed of a soft member such as a vulcanized rubber such as silicon rubber or fluorine rubber, a thermoplastic elastomer such as a urethane elastomer, an acrylic elastomer or an olefin elastomer, or a hard resin such as polysulfone. . In the present embodiment, the hood member 37 is formed of a soft member.
[0032]
The hood member 37 includes a protruding portion 38 and an endoscope fixing portion 39.
The protruding portion 38 is formed in a petal shape and protrudes in the direction in front of the visual field from the distal end portion 17. The endoscope fixing portion 39 is formed in a cylindrical shape and is provided on the proximal end side of the protruding portion 38.
[0033]
The inner diameter of the endoscope fixing portion 39 is formed to be substantially the same as or slightly smaller than the outer diameter of the distal end portion 17, and is formed in an elastically deformable state. Thereby, the distal end portion 17 of the endoscope fixing portion 39 can be press-fitted.
[0034]
A tapered portion 45 is provided on the outer periphery of the proximal end portion of the endoscope fixing portion 39. The taper portion 45 reduces the step of the base end portion and thins the base end portion to facilitate elastic deformation so that the distal end portion 17 can be easily press-fitted into the endoscope fixing portion 39. .
[0035]
The tightening rate at the time of press-fitting does not come off due to friction with the body cavity wall in the examination, and is configured to have a fixing strength that can be easily attached / detached at the time of attachment / detachment. Specifically, the loading / unloading force amount is set to about 5 to 20N.
[0036]
The length of the endoscope fixing portion 39 is a range in which the end of the endoscope fixing portion 39 does not reach the position of the rotation pin 36 on the most distal end side of the bending portion 16 when the endoscope fixing portion 39 is attached to the distal end portion 17. It is formed as long as possible. As a result, the endoscope fixing portion 39 ensures the fixation by increasing the fitting length with the distal end portion 17 as much as possible within a range that does not affect the bending operation of the bending portion 16.
[0037]
Between the endoscope fixing portion 39 and the protruding portion 38, a tip end contact portion 40 protruding to a diameter smaller than the outer diameter of the tip portion 17 is provided.
[0038]
The distal end surface of the distal end portion 17 abuts on the distal end abutment portion 40 so that the distal end portion 17 and the hood member 37 can be positioned in the axial direction. Note that the tip end contact portion 40 may be provided on a part rather than the entire circumference.
[0039]
As shown in FIG. 3, the tip end abutting portion 40 is provided with a rotational direction positioning portion 41 that partially protrudes inward.
[0040]
The rotation direction positioning portion 41 is provided with a nozzle engagement groove 42 cut out in a concave shape. The air supply / water supply nozzle 18 is engaged with the nozzle engagement groove 42, and by this engagement, the distal end portion 17 and the hood member 37 are positioned in the rotational direction with the axial direction as the rotation center.
[0041]
On the inner peripheral surface side of the projecting portion 38, a slope-shaped slope portion 44 having a diameter increasing from the tip contact portion 40 toward the tip side of the projecting portion 38 is provided. Thereby, on the inner peripheral surface side of the projecting portion 38, water, body fluid, filth, and the like attached to the surface of the tip portion 17 easily flows to the outside of the projecting portion 38, and these are difficult to collect.
[0042]
As shown in FIGS. 3 and 4, the tip edge 43 of the protrusion 38 has a shape corresponding to the observation field area of the observation optical system 34 so that the tip edge 43 can be seen as little as possible in the observation image. Is formed.
[0043]
As shown in FIG. 5, the observation image 46 displayed on the monitor 6 has a substantially rectangular shape.
[0044]
FIG. 6 shows an observation visual field region when such an observation image 46 is displayed.
The surface A1 is the most advanced lens surface of the observation optical system 34 shown in FIG. 3, and the surface B1 is a virtual surface about 4 mm from the lens surface.
[0045]
The observation visual field range on the surface A1 is the region a1, and the observation visual field range on the surface B1 is the region b1.
[0046]
A space between the region a1 and the region b1 is an observation visual field region 47.
At this time, the lateral surface of the observation visual field region 47 becomes a slope 48 formed from a set of light rays.
[0047]
As shown in FIG. 5, since the diagonal length L2 is longer than the diagonal length L1 in the observation image 46, the diagonal viewing angle is larger.
[0048]
Further, in the observation optical system 34 normally used for the endoscope 2, the degree of image compression is larger at a position farther from the center due to the aberration of the optical system due to its characteristics.
[0049]
Therefore, in the case of the shape of the observation image 46 shown in FIG. 5, the shape of the region b1 is not the same shape as the observation image 46 as shown in FIG. 6, and the region in the diagonal direction X is large. Therefore, the shape of the slope 48 is uneven.
[0050]
As shown in FIGS. 2 and 4, the front end edge 43 is formed in a shape corresponding to the inclined surface 48, and the upper end edge 43 in the figure and the portion 43a indicated by the hatched portion shown in FIG. Are formed in substantially the same shape as the shape of the slope 48 shown in FIG. 6 at each position, or the slope 48 is slightly offset from the shape of the slope 48 as shown in FIGS. A portion 49 is formed.
[0051]
As shown in FIGS. 3 and 4, the tip edge portion 43 has an uneven shape reflecting the shape of the slope 48 described above. In this case, as for the front edge part 43, A part, B part, C part, and D part are convex, and E part, F part, G part, and H part are concave.
[0052]
In the case where the protruding portion 38 has a concave portion and unevenness is generated, it is desirable that the protruding length is increased as a convex portion in the vicinity of the observation optical system 34. Further, it is desirable that there are three or more convex portions.
[0053]
In the E part, the F part, the G part, and the H part which are the concave parts, the slope part 44 is connected to the slope 48 and is an opening toward the outside. Mucus, filth, and water fed from the air / water feeding nozzle 18 entering the inside of the protruding portion 38 are discharged from these concave portions to the outside of the protruding portion 38 via the slope portion 44. Thereby, a visual field is not obstruct | occluded by filth, mucus, etc.
[0054]
As shown in FIG. 4, a chamfer 71 having a radius of about 0.3 to 1 mm is formed on the outer edge of the tip edge 43. A chamfer 72 having a radius of about 0.3 to 1 mm is also formed at the tip end portion of the slope portion 49.
[0055]
As shown in FIG. 2, the observation depth of the observation optical system 34 is set to 4 mm to 100 mm, and the protrusion amount L0 at the position where the protrusion amount of the distal end edge 43 from the most advanced lens of the observation optical system 34 is the largest is as follows. The depth is set to be approximately equal to the minimum value (near point) or longer than this value. In the present embodiment, the tip edge portion 43 is formed to project so that the projecting amount L0 is about 4 mm.
[0056]
With such a structure, the endoscope apparatus 1 according to the present embodiment has a hood having a protruding portion 38 protruding in the observation visual field direction of the endoscope 2 at the distal end portion 17 of the insertion portion 7 of the endoscope 2. A member 37 is provided, and the observation image 46 of the endoscope 2 has a non-circular shape.
[0057]
In the endoscope apparatus 1, a slope portion 49 having a shape corresponding to the observation visual field region 47 of the endoscope 2 is formed at the distal end edge portion 43 of the protruding portion 38.
[0058]
(Function)
When the hood member is transparent, the illumination performance is good because the illumination light is not blocked by the hood member.
[0059]
The hood member may be black. In this case, the protrusion may be provided with a notch and a sloped portion in the same manner as the observation visual field region in accordance with the irradiation region of the emitted light of the illumination optical system.
[0060]
In the case of black, the illumination light is not reflected by the inner wall of the hood member as compared with the transparent one, so that halation that occurs when using a treatment instrument can be prevented.
[0061]
Further, the color may be matched with an applicable inner celebration mirror and a hood member, and the color may be changed if it is not applicable. Moreover, in order to make removal of a front-end | tip part and a hood member easy, you may make these colors different and may recognize each easily.
[0062]
It should be noted that the endoscope model name to which this can be applied and the outer diameter of the distal end of the endoscope may be displayed on the hood member.
[0063]
In addition, the protrusion amount of a protrusion part can be set to about 2 mm-10 mm.
7 and 8 are explanatory views for explaining the operation of the protruding portion 38 of the first embodiment.
[0064]
In FIG. 7, the solid line indicates the shape of the protruding portion 38 of the present embodiment, and the broken line forms the shapes of the chamfers 71 and 72 without providing the inclined surface portion 49 while maintaining the protruding length of the protruding portion 38. The shape of the protrusion part 38 in the case of doing is shown. When the protruding portion 38 is formed as shown by the broken line, the protruding portion 38 becomes thin.
[0065]
That is, in the present embodiment, the slope portion 49 corresponding to the observation visual field region 48 is provided, so that the protrusion 38 has a large thickness without shortening the protrusion length. Thereby, in this Embodiment, the protrusion part 38 can be made hard to damage, and even if the protrusion part 38 has a some notch shape, when the protrusion part 38 is pressed on the body cavity inner wall, Deformation can be prevented. Moreover, in this Embodiment, since the chamfers 71 and 72 can be formed large, insertability improves.
[0066]
In FIG. 8, the solid line indicates the shape of the protruding portion 38 of the present embodiment, and the broken line indicates the shape when the wall thickness is ensured without providing the inclined portion 49 on the protruding portion 38. When the protruding portion 38 is formed as indicated by the broken line, the protruding length of the protruding portion 38 is shortened.
[0067]
That is, in the present embodiment, the protruding length of the protruding portion 38 can be increased without increasing the outer diameter, and the performance of the hood is improved.
[0068]
Further, even when the mucous membrane is in contact with the tip edge portion 43 and covers the entire visual field, the protrusion amount L0 of the tip edge portion 43 shown in FIG. The observation optical system 34 is focused on the mucous membrane of the distal end edge 43, and the observation image becomes clear.
[0069]
(effect)
As described above, according to the present embodiment, the endoscope apparatus has a small diameter, the hood member 37 is not easily damaged, has good insertability, and the hood member 37 is less visible in the observation image and has good observation performance. Can provide. Further, according to the present embodiment, it is possible to provide an endoscope apparatus with good observation performance even when the hood member 37 contacts the mucous membrane.
[0070]
In the present embodiment shown in FIGS. 1 to 6, an index for aligning the position of the hood member 37 in the rotational direction is provided, for example, on the tip edge 43 without providing the nozzle engaging groove 42. Also good. At this time, as a mark on the distal end portion 17 side for aligning the index, an index may also be attached to the distal end portion 17 side, or a configuration adapted to the air / water supply nozzle 18, suction port 19, and observation optical system 34 of the distal end portion 17. It is also good.
[0071]
When the hood member 37 is separate from the endoscope 2, the attachment position of the hood member 37 and how the hood member 37 appears in the observation image are likely to vary, but the slope portion corresponding to the observation visual field region corresponding to each position By forming the protrusion length as long as possible, it is possible to ensure a long protrusion length even when there is variation.
[0072]
In addition, according to the present embodiment, it is easy to attach the hood member 37 with the inclined surface disposed at an appropriate position according to the observation visual field region by providing the positioning means and the index in the axial direction and the rotational direction. It can be done.
[0073]
(Second Embodiment)
FIG. 9 is a side view showing the distal end portion of the endoscope according to the second embodiment of the present invention with a part cut away.
[0074]
(Constitution)
The second embodiment shown in FIG. 9 is different from the first embodiment shown in FIG. 2 in that the hood member 137 is formed integrally with the distal end portion 17.
[0075]
As shown in FIG. 9, the hood member 137 is formed of a hard resin such as polysulfone, and also serves as an insulating cover that covers the metal component 117 inside the distal end portion 17.
[0076]
The observation optical system 34 of the distal end portion 17 has an observation visual field region 47 similar to that of the first embodiment shown in FIG.
[0077]
A slope 149 corresponding to the slope 48 of the observation visual field region 47 is provided at each position on the tip edge 143 of the hood member 137.
[0078]
The tip edge portion 143 of the hood member 137 is provided with a slope portion 149 corresponding to the slope 48 of the observation visual field region 47 at each position as in the first embodiment shown in FIGS.
[0079]
Further, a chamfer 71 having a radius of about R1 mm is formed on the outer peripheral edge of the leading edge 143.
[0080]
In the present embodiment, the slope portion 149 is formed as wide as possible, and the tip edge portion 143 is formed as thick as possible.
(Function)
In the case where the hood member 137 is formed integrally with the distal end portion 17, the durability of the hard member is better than that of the soft member from the viewpoint of resistance to cutting and abrasion.
[0081]
When the hood member 137 is formed of a hard member, the tip edge 143 is more likely to be damaged by an impact or the like than when it is formed of a soft member. However, in the second embodiment, the meat of the tip edge 143 is Since the thickness can be increased and the chamfer 71 can be formed into a large R shape, even if it is hard, it can be made difficult to break.
[0082]
(effect)
As described above, according to the second embodiment, the same effect as that of the first embodiment shown in FIGS. 1 to 6 is obtained, and also when the hood member 137 is formed of a hard member. It can be made difficult to break sufficiently.
[0083]
(Third embodiment)
10 and 11 relate to a third embodiment of the present invention, FIG. 10 is a side view showing a protruding portion of the distal end portion of the endoscope, and FIG. 11 is a plan view showing an observation image displayed on a monitor. is there.
[0084]
(Constitution)
As shown in FIG. 10, in the protruding portion 238 of the hood member 237 provided at the distal end portion of the endoscope of the present embodiment, the distal end portion of the distal end edge portion 243 is slightly smaller than the inclined surface 48 of the observation visual field region 47. It has a portion 243a formed in a shape overlapping with a small amount. That is, the portion 243 a protrudes from the observation visual field region 47.
[0085]
Then, the overlap amount x of the tip edge portion 243 with respect to the observation field region 47 in the range of the distal value from the center of the observation field in the diagonal direction X shown in FIG. 6 is formed larger than the overlap amount y at other positions. Has been. That is, as shown in FIG. 11, the overlapping amounts x and y are formed so that the amount of the tip edge 243 visible on the observation image 46 is uniform in consideration of the aberration of the observation optical system 34. .
[0086]
(Function)
In the present embodiment, the image is most compressed by the aberration of the observation optical system 34 in the range of the distal value from the center of the observation field in the diagonal direction X shown in FIG. For this reason, as shown in FIG. 11, in the observation image 46 of the monitor 6, the images 243 b and 243 c of the front edge portion 243 that protrude from the diagonal surface 48 in the diagonal direction X and overlap the observation visual field region 47 are compressed. As a result, the images 243b and 243c of the tip edge portion 243 are not significantly different in the appearance on the observation image 46 from the image 243d of the tip edge portion 243 that overlaps the observation visual field region 47 at other positions.
[0087]
For this reason, the protrusion length or thickness of the hood member 237 can be formed with a minimum influence on the observation visual field.
[0088]
(effect)
As described above, according to the present embodiment, the same effects as those of the embodiment shown in FIGS. 1 to 6 are obtained, and the protrusion length of the hood member 237 is further increased or the wall thickness is increased. In addition, it is possible to provide an endoscope apparatus with good insertability or durability.
[0089]
(Fourth embodiment)
FIG. 12 is a plan view showing an observation image displayed on the monitor according to the fourth embodiment of the present invention. The shape of the protrusion at the distal end of the endoscope according to the fourth embodiment will be described with reference to FIG.
[0090]
(Constitution)
In the present embodiment, a shape in which the tip end portion of the tip edge portion 243 overlaps with the slope 48 of the observation visual field region 47 shown in FIG. 10 only in a range from the center of the observation visual field in the diagonal direction X to a slight amount. It has the part currently formed. As a result, as shown in FIG. 12, in the observation image 46 of the monitor 6, images 243b, 243c, and 243e of the leading edge 243 that protrude from the diagonal surface 48 in the diagonal direction X and overlap the observation visual field region 47 are displayed. .
[0091]
(Function)
In the present embodiment, the observation image 46 of the monitor 6 has a high compression rate and the field of view in the diagonal direction X having a large angle of view is slightly reduced, but the compression rate is low and the angle of view is originally small. The protrusion length or thickness of the hood member 237 can be increased without further reducing the visual field of the portion.
[0092]
(effect)
As described above, according to the fourth embodiment, it is possible to provide an endoscope apparatus that has the same effects as those of the third embodiment shown in FIGS. .
[0093]
In the first to fourth embodiments, an endoscope apparatus having observation images as shown in FIGS. 13, 14, 15 and 16 on the assumption that the observation image has a non-circular shape. Applicable in
[0094]
FIG. 13: The observed image 46 is a square or rectangle, and is a substantially quadrangle rounded to the corner.
FIG. 14: A rectangle in which the observation image 46 is displayed on the entire screen of the monitor 6
Figure 15: Roughly quadrangular shape with top and bottom cut off
Figure 16: Rounded top and bottom, left and right side cut out, roughly square
(Fifth embodiment)
FIGS. 17 to 20 relate to a fifth embodiment of the present invention, FIG. 17 is a cross-sectional view showing a hood member, FIG. 18 is a cross-sectional view showing a hood member mounting tool to which the hood member is attached, and FIG. FIG. 20 is a sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member wearing tool, and FIG. 20 is a sectional view showing a state in which the hood member wearing tool is removed from the state of FIG.
[0095]
(Constitution)
As shown in FIG. 17, the hood member 50 has a substantially cylindrical shape and is detachable from the distal end portion of the endoscope. The hood member 50 can be formed of a soft member such as a vulcanized rubber such as silicon rubber or fluorine rubber, a thermoplastic elastomer such as a urethane elastomer, an acrylic elastomer or an olefin elastomer, or a hard resin such as polysulfone. . In the present embodiment, the hood member 50 is formed of a soft member.
[0096]
The hood member 50 is provided with a protruding portion 51 and an endoscope fixing portion 52.
The inner diameter of the endoscope fixing portion 52 of the hood member 50 is formed to be substantially the same as or slightly smaller than the outer diameter of the distal end portion 17 of the endoscope shown in FIG. Thereby, the endoscope fixing portion 52 is formed so that the distal end portion 17 can be press-fitted by elastic deformation.
[0097]
As shown in FIG. 18, the hood member mounting tool 53 is for mounting a removable hood member 51 on the distal end portion 17 of the insertion portion of the endoscope.
[0098]
The hood member mounting tool 53 is provided with a hood member fixing portion 54 and a grip portion 55.
[0099]
The outer diameter of the hood member fixing portion 54 is formed substantially the same as the inner diameter of the protruding portion 51. Thereby, the protrusion part 51 can be externally fitted to the hood member fixing part 54.
[0100]
A hood member abutting portion 56 is provided at the base end portion of the hood member fixing portion 54. A tip contact portion 57 is provided on the tip side of the hood member fixing portion 54.
[0101]
The length L11 between the hood member contact portion 56 and the tip portion contact portion 57 allows the amount of the hood member 50 that can be seen in the observation field when the hood member 50 is attached to the tip portion 17, and The optimum amount of protrusion L12 of the protrusion 51 from the tip portion 17 is set so that the effect of the hood member 50 shown in FIG. 20 is maximized.
With such a structure, the hood member abutting portion 56 serves as a hood member regulating means for regulating the position of the hood member 50, and the tip end abutting portion 57 is a tip portion regulating means for regulating the position of the tip portion 17. Thus, the hood member mounting tool 53 regulates the mounting position of the hood member 50 with respect to the distal end portion 17 when the hood member 50 is mounted on the distal end portion.
[0102]
(Function)
When the hood member 50 is attached to the distal end portion 17, as shown in FIG. 18, the hood member fixing portion 54 of the hood member attachment tool 53 is inserted into the protruding portion 51 of the hood member 50, and the hood member abutting portion 56. Until the tip of the protrusion 51 abuts.
[0103]
Next, as shown in FIG. 19, the distal end portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50, and inserted until the distal end portion contact portion 57 and the distal end portion 17 abut against each other.
[0104]
When the front end abutting portion 57 and the front end portion 17 come into contact with each other and the hood member abutting portion 56 and the front end of the protruding portion 51 come into contact with each other, the hood member mounting tool 53 is removed from the hood member 50 as shown in FIG.
[0105]
Moreover, you may mount in the following order.
First, an appropriate amount of the distal end portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50. Thereafter, the hood member fixing portion 54 of the hood member mounting tool 53 is inserted into the protruding portion 51 of the hood member 50.
[0106]
Next, after adjusting the position of the hood member 50 so that the hood member abutting portion 56 and the tip end portion of the protruding portion 51 abut and the tip portion abutting portion 57 and the tip end portion 17 abut, The mounting tool 53 is removed.
[0107]
As described above, as shown in FIG. 20, the hood member 50 is fixed to the distal end portion 17 with the position in the axial direction being defined at a position where the proper protrusion amount L12 with respect to the distal end portion 17 is obtained.
[0108]
(effect)
As described above, according to the fifth embodiment, the position of the hood member 50 in the axial direction can be specified reliably and easily, and can be attached to the distal end portion 17, and the observation performance is good and the hood member can be easily attached. A hood member mounting tool 53 can be provided.
[0109]
(Sixth embodiment)
FIG. 21 is an explanatory view showing a hood mounting method using the hood member mounting tool according to the sixth embodiment of the present invention.
[0110]
(Constitution)
As shown in FIG. 21, the three types of endoscopes 2a, 2b, and 2c have substantially the same outer diameters at the distal end portions 17a, 17b, and 17c.
[0111]
On the other hand, the tip portions 17a, 17b, and 17c are different in the layout of the observation optical system 34, illumination optical system 35, air / water supply nozzle 18, suction port 19 and the like shown in FIG.
[0112]
Further, it is displayed on the monitor 6 shown in FIG. 1 due to the difference in the configuration of the lens (not shown) constituting the observation optical system 34, the difference in CCD, the display shape of the observation image 46 on the monitor 6 controlled by the video processor 5, and the like. The observation field areas of the observation images are different.
[0113]
For this reason, when one type of hood member 50a is attached to the three types of tip portions 17a, 17b, and 17c, the hood members that can be seen in the observed images are the same when the protruding amount of the protruding portion 51 from the tip portion 17 is the same. The amount of 50a will be different.
[0114]
On the other hand, the hood member 50a can be commonly used for each of the endoscopes 2a, 2b, and 2c.
[0115]
When the hood member 50a is attached to the distal end portions 17a, 17b, and 17c, the optimum projection amount L12 that allows the amount of the hood member 50 visible in the observation image and maximizes the effect of the hood member is an internal Unique in combination with mirrors 2a, 2b, 2c. These are designated L12a, L12b, and L12c, respectively.
[0116]
When the hood member 50a is mounted on these endoscopes 2a, 2b, and 2c, dedicated hood member mounting tools 53a, 53b, and 53c are used.
[0117]
The lengths L11a, L11b, and L11c between the hood member abutting portion 56 and the tip portion abutting portion 57 of the hood member mounting tools 53a, 53b, and 53c are formed to be the same as the protruding amounts L12a, L12b, and L12c, respectively. Has been.
[0118]
The grip portion 55 is provided with display portions 58a, 58b, and 58c in which the names and model numbers of the respective endoscopes, the names and model numbers of the hood members 50a, and the manufacturer names are displayed by molding or printing.
[0119]
(Function)
When wearing the hood member 50a, the contents of the display 58 are confirmed, and a hood member wearing tool corresponding to each endoscope is selected.
[0120]
The mounting procedure is the same as that of the fifth embodiment shown in FIG.
In each of the endoscopes 2a, 2b, and 2c, the hood member 50a is fixed to the distal end portions 17a, 17b, and 17c with the proper protruding amounts L12a, L12b, and L12c, the positions of which are in the axial direction.
[0121]
(effect)
According to such a sixth embodiment, in addition to the same effects as those of the fifth embodiment shown in FIGS. 17 to 20, a common hood member is provided at each of the distal end portions of different endoscopes. It can be installed in the optimal position.
[0122]
(Seventh embodiment)
FIG. 22 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the seventh embodiment of the present invention. In FIG. 22, the same components as those in the embodiment of FIG. 19 are denoted by the same reference numerals, and description thereof is omitted.
[0123]
(Constitution)
As shown in FIG. 22, the hood member mounting tool 353 is provided with a cylindrical outer diameter regulating portion 59.
[0124]
The inner diameter D1 of the outer diameter restricting portion 59 is substantially the same as the outer diameter D2 of the protruding portion 51 of the hood member 50, and the outer diameter restricting portion 59 is formed so that the protruding portion 51 can be inserted.
[0125]
(Function)
When the hood member 50 is mounted on the hood member mounting tool 353, the protruding portion 51 of the hood member 50 is inserted between the hood member fixing portion 54 and the outer diameter regulating portion 59.
[0126]
Next, as in the case of FIG. 19, the distal end portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50, and then the hood member mounting tool 353 is removed from the hood member 50. As a result, as in the case of FIG. 20, the hood member 50 is attached and fixed to the distal end portion 17.
[0127]
FIG. 23 is an explanatory view for explaining the action when the hood member 50 is mounted on the tip portion 17 after being mounted on the hood member mounting tool 353 with the axial direction of the hood member 50 being reversed.
[0128]
As shown in FIG. 23, the endoscope fixing portion 52 of the hood member 50 is inserted between the hood member fixing portion 54 and the outer diameter restricting portion 59, contrary to the original case.
[0129]
In this state, even if the distal end portion 17 is next press-fitted into the protruding portion 51 of the hood member 50, the inner diameter of the protruding portion 51 is smaller than the inner diameter of the endoscope fixing portion 52 and the outer diameter of the distal end portion 17, and Since the deformation of the protruding portion 51 is restricted by the outer diameter restricting portion 59, the protruding portion 51 cannot be increased in diameter, and the distal end portion 17 cannot be press-fitted.
[0130]
Thereby, it can prevent attaching the hood member 50 to the front-end | tip part 17 contrary to the original.
[0131]
FIG. 24 is an explanatory diagram for explaining the operation when the hood member 50 is mistakenly set in the opposite direction and the hood member 50 is first attached to the distal end portion 17.
[0132]
As shown in FIG. 24, an appropriate amount of the distal end portion 17 is press-fitted into the protruding portion 51 of the hood member 50.
[0133]
At this time, the inner diameter of the protruding portion 51 is not appropriate with respect to the outer diameter of the distal end portion 17, but the hood member 50 may be elastically deformed and attached with an increased diameter.
[0134]
Next, when an attempt is made to insert the hood member fixing portion 54 of the hood member mounting tool 353 into the endoscope fixing portion 52 of the hood member 50, the endoscope fixing portion 52 of the hood member 50 is expanded and deformed. Therefore, it hits the outer diameter restricting portion 59 and cannot be inserted.
[0135]
Thereby, it can prevent attaching the hood member 50 to the front-end | tip part 17 in the direction opposite to the original.
[0136]
(effect)
According to such a seventh embodiment, in addition to the same effects as those of the fifth embodiment shown in FIGS. 17 to 20, it is possible to prevent the hood member from being erroneously mounted by reversing the axial direction. .
[0137]
(Eighth embodiment)
25 and 26 relate to the eighth embodiment of the present invention, FIG. 25 is a cross-sectional view showing a closed state of the hood member mounting tool to which the hood member is attached, and FIG. 26 is a state in which the hood member mounting tool is opened. FIG.
[0138]
(Constitution)
As shown in FIGS. 25 and 26, the hood member mounting tool 453 also serves as a packaging container for the hood member 50.
[0139]
The hood member mounting tool 453 has a main body portion 62, a lid-like accommodation portion 63, and a hinge portion 64 that connects them.
[0140]
The hood member mounting tool 453 is formed of a resin member that can be sterilized by ethylene oxide gas sterilization, autoclave sterilization, gamma ray sterilization, or the like. For example, the hood member mounting tool 453 is formed of polystyrene that can be sterilized with ethylene oxide gas.
[0141]
The main body 62 is provided with a hood member fixing portion 54 similar to that shown in FIG. 18, and the hood member 50 is fixed in advance.
[0142]
The outer diameter of the hood member fixing portion 54 is formed to be slightly larger than the inner diameter of the protruding portion 51, and the hood member fixing portion 54 is press-fitted into the protruding portion 51. The protruding portion 51 is fixed to the hood member fixing portion 54 by its own elastic force. The outer diameter of the hood member fixing portion 54 is dimensioned so that the fixing force between the protruding portion 51 and the hood member fixing portion 54 is smaller than the fixing force between the endoscope fixing portion 52 and the distal end portion 17 shown in FIG. Is set. The main body 62 is provided with a hood member abutting portion 56 and a tip end abutting portion 57 similar to those shown in FIG.
[0143]
The main body portion 62 is provided with a convex portion 65, and the housing portion 63 is provided with a locking portion 66 that detachably locks the convex portion 65.
[0144]
In the hood member mounting tool 453, the convex portion 65 is engaged and locked with the locking portion 66, so that the main body portion 62 and the housing portion 63 are locked. As shown in FIG. Is housed.
[0145]
The hood member mounting tool 453 can be sterilized as described above, and is housed in a peel pack or the like that can maintain the sterilized state of the contents for a certain period of time, and is sterilized in this state and delivered to the user.
[0146]
(Function)
When the hood member 50 is attached to the distal end portion 17 shown in FIG. 19, the peel pack is opened, the hood member attachment tool 453 shown in FIG. 25 is taken out, and the main body portion 62 is accommodated as shown in FIG. The locking of the part 63 is released and the hood member 50 is exposed. The hood member mounting tool 453 maintains the sterilized state of the hood member 50 until this time.
[0147]
Next, the distal end portion 17 shown in FIG. 19 is inserted into the endoscope fixing portion 52, and the hood member 50 is positioned and fixed to the distal end portion 17 in the same manner as in the fifth embodiment. Is removed from the hood member 50. At this time, the outer diameter of the hood member fixing portion 54 is set so that the fixing force between the protruding portion 51 and the hood member fixing portion 54 is smaller than the fixing force between the endoscope fixing portion 52 and the distal end portion 17. Therefore, even if the hood member 50 is not gripped with fingers, the hood member mounting tool 453 can be removed from the hood member 50 without the positions of the hood member 50 and the distal end portion 17 being displaced.
[0148]
As described above, the hood member 50 is mounted on the distal end portion 17 without removing the hood member 50 from the hood member mounting tool 453 with a finger and without touching the hood member 50.
[0149]
(effect)
According to such an eighth embodiment, in addition to the same effects as those of the fifth embodiment shown in FIGS. 17 to 20, it is possible to save the trouble of attaching the hood member to the hood member mounting tool before the inspection, It can be installed more easily. In addition, since the hood member is fixed to the hood member mounting tool in advance, it is possible to prevent erroneous mounting of the hood member in the reverse axial direction. Furthermore, the hood member can be easily kept clean until immediately before use of the endoscope.
[0150]
(Ninth embodiment)
FIG. 27 is an explanatory view showing a state when the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the ninth embodiment of the present invention.
[0151]
(Constitution)
As shown in FIG. 27, the ridge line of the distal end contact portion 68 on the distal end side of the protruding portion 551 of the hood member 67 is formed in a petal shape that matches the observation image.
[0152]
A hood member contact portion 556 having substantially the same shape as the distal end contact portion 68 is provided on the proximal end side of the hood member fixing portion 554 of the hood member mounting tool 69.
[0153]
A tip end contact portion 557 is provided on the tip end side of the hood member fixing portion 554. The hood member fixing portion 554 is provided with a columnar rotation direction restricting portion 70 protruding from the tip end contact portion 557.
[0154]
The outer diameter of the rotation direction restricting portion 70 is substantially the same as the inner diameter of the suction port 19 provided at the distal end portion 17, and is formed so as to be fitted to the suction port 19.
[0155]
(Function)
When the hood member 67 is mounted on the hood member mounting tool 69, the tip contact portion 68 of the hood member 67 is positioned so as to correspond to the hood member contact portion 556 having substantially the same shape as the tip contact portion 68. Thus, the tip contact portion 68 and the hood member contact portion 556 are brought into contact with each other. Thereby, the position of the rotation direction of the hood member 67 with respect to the hood member mounting tool 69 is set to a predetermined position.
[0156]
Next, the positions of the hood member mounting tool 69 and the distal end portion 17 in the rotational direction are aligned so that the suction port 19 of the endoscope 2 and the rotational direction restricting portion 70 are fitted, and the distal end portion 17 and the distal end portion abut. The hood member 67 is fixed to the distal end portion 17 at a position where the portion 557 is brought into contact.
[0157]
Accordingly, the position of the hood member 67 and the hood member mounting tool 69 in the rotational direction is restricted by the hood member contact portion 556 and the position in the axial direction is also restricted.
[0158]
On the other hand, the position of the rotation direction is regulated by the fitting of the endoscope fixing portion 552 and the distal end portion 17 and the fitting of the rotation direction regulating portion 70 and the suction port 19. Further, the position in the axial direction is regulated by the contact between the tip end contact portion 557 and the tip end portion 17.
[0159]
As described above, the tip contact portion 68 is attached with the position in the axial direction regulated at a position where the proper protrusion amount L31 with respect to the tip portion 17 is obtained, and the position in the rotational direction regulated in a state corresponding to the observation image. .
[0160]
(effect)
According to the ninth embodiment as described above, the position of the tip contact portion 68 in the axial direction and the rotational direction can be specified and attached to the tip portion 17 with good observation performance, and the hood member can be attached. Can be provided.
[0161]
The rotation direction restricting portion 70 is configured to restrict the rotation direction by engaging with the suction port 19. However, as the rotation direction restricting portion 70, the air / water supply nozzle protruding from the distal end surface of the distal end portion 17. A rotation direction restricting portion that engages with the front end portion 17 may be provided. Thus, a concave portion such as the suction port 19 provided at a position other than the center of the front end surface of the front end portion 17 or an air supply / water supply nozzle 18 may be provided. What is necessary is just to provide the rotation position control part engaged with a convex part.
[0162]
As a result, it is not necessary to provide a restricting portion for restricting the position in the rotation direction on the outer peripheral portion of the tip end portion 17, and it is not necessary to newly provide a complicated restricting portion.
[0163]
Further, since a new configuration for positioning is not required on the endoscope 2 side, it can be applied to the existing endoscope 2 and is highly versatile.
[0164]
In addition, you may provide a recessed part and a convex part in the front-end | tip part 17 separately from the suction port 19 and the air / water supply nozzle 18. FIG. The hood member mounting tool 69 may be configured as in the eighth embodiment.
[0165]
[Appendix]
According to the above-described embodiment of the present invention described in detail above, the following configuration can be obtained.
[0166]
(Additional Item 1) A hood member having a protruding portion that protrudes in the observation visual field direction of the endoscope is provided at the distal end portion of the insertion portion of the endoscope, and the shape of the observation image of the endoscope is a non-circular endoscope In the mirror device,
An endoscope apparatus, wherein a slope portion having a shape corresponding to an observation visual field region of the endoscope is formed at a distal end edge portion of the protruding portion.
[0167]
(Additional Item 2) The endoscope apparatus according to Additional Item 1, wherein the protrusion has at least one notch.
[0168]
(Additional Item 3) The overlapping amount of the protruding portion to the observation visual field region in at least a part of the range far from the center of the observation image is the overlapping amount of the protruding portion to the observation visual field region in the other range. The endoscope apparatus according to any one of appendices 1 and 2, wherein the endoscope apparatus is formed larger than the endoscope.
[0169]
(Additional Item 4) The shape of the observation image is substantially square, and the overlapping amount of the protruding portion to the observation visual field region in the range in the vicinity of at least one corner of the observation image is determined in the vicinity of the side of the observation image. The endoscope apparatus according to appendix 3, wherein the protrusion is formed to be larger than an overlapping amount of the protruding portion to the observation visual field region.
[0170]
(Additional Item 5) In the range in the vicinity of at least one corner of the observation image, the protrusion is placed in the observation visual field region, and in the range in the vicinity of the side of the observation image, the protrusion is in the observation visual field region. The endoscope apparatus according to appendix 4, wherein the projecting portion is formed in a shape that does not fit into the head.
[0171]
(Additional Item 6) The maximum protruding amount of the protruding portion from the most advanced lens surface of the observation optical system is formed to be equal to or longer than the minimum observation depth of the observation optical system. The endoscope apparatus according to any one of the above.
[0172]
(Additional Item 7) The endoscope apparatus according to any one of Additional Items 1 to 6, wherein the hood member is formed to be detachable from a distal end portion of the endoscope.
[0173]
(Additional Item 8) The endoscope apparatus according to Additional Item 7, wherein the hood member is formed so as to be detachable from a distal end portion of the endoscope, and positioning means for positioning the hood member is provided.
[0174]
(Additional Item 9) The endoscope apparatus according to Additional Item 7, wherein the hood member is formed so as to be detachable from a distal end portion of the endoscope, and an index indicating a fixed position thereof is provided.
[0175]
(Additional Item 10) In a hood member mounting tool for mounting a detachable hood member on a distal end portion of an insertion portion of an endoscope,
Hood member regulating means for regulating the position of the hood member;
Tip portion regulating means for regulating the position of the tip portion;
And a mounting position of the hood member with respect to the distal end portion when the hood member is mounted on the distal end portion.
[0176]
(Additional Item 11) The hood member regulating means has a hood member axial regulating part for regulating the axial position of the hood member, and the tip part regulating means regulates the axial position of the tip part. 11. The hood member mounting tool according to additional item 10, wherein the hood member mounting tool has a tip end axial direction regulating portion.
[0177]
(Additional Item 12) The hood member restricting means includes a hood member rotation direction restricting portion that restricts the position of the hood member in the rotation direction, and the tip portion restricting means restricts the position of the tip portion in the rotation direction. The hood member mounting tool according to any one of Additional Items 10 and 11, further comprising a distal end rotation direction restricting portion.
[0178]
(Additional Item 13) The hood according to Additional Item 12, wherein the distal end rotation direction restricting portion is an engaging portion that engages with either a concave portion or a convex portion provided on the distal end surface of the distal end portion. Member mounting tool.
[0179]
(Additional Item 14) The additional point item 13, wherein the distal end rotation direction restricting portion is an engagement portion that engages with a suction port that opens at the distal end portion or a fluid ejection nozzle that protrudes at the distal end portion. Hood member mounting tool.
[0180]
(Additional Item 15) The hood member mounting tool according to any one of Additional Items 10 to 14, further comprising a hood storage portion that stores the hood member.
[0181]
(Additional Item 16) The hood member mounting tool according to any one of Additional Items 10 to 15, further comprising a hood member fixing portion that detachably fixes the hood member.
[0182]
【The invention's effect】
As described above, according to the present invention, it is possible to easily and accurately attach the hood member to the distal end portion of the insertion portion of the endoscope.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an overall configuration of an endoscope apparatus according to a first embodiment of the present invention.
2 is a cross-sectional view of the distal end portion of the first embodiment of FIG. 1;
FIG. 3 is a front view of the distal end portion of the endoscope according to the first embodiment of FIG. 1;
4 is a side view showing a hood member that is detachably connected to the distal end portion of the endoscope according to the first embodiment of FIG. 1; FIG.
FIG. 5 is a plan view showing an observation image displayed on the monitor according to the first embodiment of FIG. 1;
6 is an explanatory diagram showing an observation visual field region when the observation image of FIG. 5 is displayed. FIG.
FIG. 7 is a first explanatory view for explaining the operation of the protrusion of the first embodiment of FIG. 1;
FIG. 8 is a second explanatory view for explaining the operation of the protrusion of the first embodiment of FIG. 1;
FIG. 9 is a side view showing a distal end portion of an endoscope according to a second embodiment of the present invention with a part cut away.
FIG. 10 is a side view showing a protruding portion of a distal end portion of an endoscope according to a third embodiment of the present invention.
FIG. 11 is a plan view showing an observation image displayed on the monitor of the third embodiment in FIG. 10; It is.
FIG. 12 is a plan view showing an observation image displayed on a monitor of an endoscope apparatus according to a fourth embodiment of the present invention.
FIG. 13 is a plan view showing a first example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 14 is a plan view showing a second example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 15 is a plan view showing a third example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 16 is a plan view showing a fourth example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 17 is a cross-sectional view showing a hood member used in a hood member mounting tool according to a fifth embodiment of the present invention.
FIG. 18 is a cross-sectional view showing a hood member wearing tool according to a fifth embodiment of the present invention.
19 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool of FIG. 18;
20 is a cross-sectional view showing a state in which the hood member mounting tool is removed from the state shown in FIG.
FIG. 21 is an explanatory view showing a hood mounting method using a hood member mounting tool according to a sixth embodiment of the present invention.
FIG. 22 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the seventh embodiment of the present invention.
FIG. 23 is an explanatory view for explaining the operation when the hood member is mounted on the hood member mounting tool with the axial direction of the hood member being mistaken in the opposite direction in the seventh embodiment of FIG. 22;
FIG. 24 is an explanatory diagram for explaining the operation when the hood member is mounted on the hood member mounting tool while the hood member is mistaken in the opposite axial direction in the seventh embodiment of FIG. 22;
FIG. 25 is a cross-sectional view showing a hood member mounting tool according to an eighth embodiment of the present invention.
26 is a perspective view showing a state where the hood member mounting tool of FIG. 25 is opened.
FIG. 27 is an explanatory view showing a state when the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the ninth embodiment of the present invention.
[Explanation of symbols]
1 ... Endoscopic device
2 ... Endoscope
3 ... Light source device
4 ... Signal cable
5 ... Video processor
6 ... Monitor
7 ... Insertion part
17 ... tip
34. Observation optical system
37 ... Hood member
38 ... Projection
39: Endoscope fixing part
43 ... tip edge
47 ... Observation field of view
48… Slope
49 ... Slope
50: Hood member
53 ... Hood fitting
56 ... Hood member contact portion
57 ... Tip contact portion

Claims (3)

内視鏡の挿入部先端部に着脱自在なフード部材を装着するためのフード部材装着具において、
前記フード部材の位置を規制するフード部材規制手段と、
前記挿入部先端部の位置を規制する先端部規制手段と、
を具備し、前記フード部材を前記挿入部先端部に装着する場合に、前記挿入部先端部に対する前記フード部材の装着位置を規制することを特徴とするフード部材装着具。In a hood member mounting tool for mounting a detachable hood member on the distal end of the insertion portion of the endoscope,
Hood member regulating means for regulating the position of the hood member;
A tip restricting means for restricting the position of the tip of the insertion portion;
And a mounting position of the hood member with respect to the distal end portion of the insertion portion when the hood member is mounted on the distal end portion of the insertion portion. 前記フード部材規制手段は、前記フード部材の軸方向の位置を規制するフード部材軸方向規制部を有し、前記先端部規制手段は前記挿入部先端部の前記軸方向の位置を規制する先端部軸方向規制部を有することを特徴とする請求項１に記載のフード部材装着具。The hood member restricting means includes a hood member axial restricting portion that restricts an axial position of the hood member, and the tip restricting means restricts the axial position of the insertion portion distal end. The hood member mounting tool according to claim 1, further comprising an axial restriction portion. 前記フード部材規制手段は、前記フード部材の回転方向の位置を規制するフード部材回転方向規制部を有し、前記先端部規制手段は前記挿入部先端部の前記回転方向の位置を規制する先端部回転方向規制部を有することを特徴とする請求項１又は２に記載のフード部材装着具。The hood member restricting means has a hood member rotation direction restricting portion that restricts the position of the hood member in the rotation direction, and the tip portion restricting means is a tip portion that restricts the position of the insertion portion tip portion in the rotation direction. It has a rotation direction control part, The food | hood member mounting tool of Claim 1 or 2 characterized by the above-mentioned.
JP2002040532A 2002-02-18 2002-02-18 Hood member mounting tool Expired - Fee Related JP3645224B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011245012A (en) * 2010-05-26 2011-12-08 Masakatsu Nakamura Mounting assisting tool of hood for endoscope

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JP4611034B2 (en) * 2005-01-05 2011-01-12 オリンパス株式会社 In-subject information acquisition device storage case
JP4579005B2 (en) * 2005-02-23 2010-11-10 オリンパスメディカルシステムズ株式会社 In-subject information acquisition device storage case
JP4611091B2 (en) * 2005-04-15 2011-01-12 オリンパスメディカルシステムズ株式会社 In-subject information acquisition device storage case
WO2017199437A1 (en) * 2016-05-20 2017-11-23 オリンパス株式会社 Endoscope optical adapter replacement device and endoscope device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011245012A (en) * 2010-05-26 2011-12-08 Masakatsu Nakamura Mounting assisting tool of hood for endoscope

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