JP2006345888A - Distal end part of endoscope - Google Patents

Distal end part of endoscope

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JP2006345888A
JP2006345888A JP2005171937A JP2005171937A JP2006345888A JP 2006345888 A JP2006345888 A JP 2006345888A JP 2005171937 A JP2005171937 A JP 2005171937A JP 2005171937 A JP2005171937 A JP 2005171937A JP 2006345888 A JP2006345888 A JP 2006345888A
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water
sub
end
jetted
part
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JP2005171937A
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JP4598191B2 (en )
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Noriyuki Sugita
憲幸 杉田
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Pentax Corp
ペンタックス株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a distal end part of an endoscope capable of blowing water jetted from a sub water sending port to the center position of an observation visual field regardless of a distance to an object. <P>SOLUTION: By arranging a stream drawing member 7 acting to draw the water W jetted from the sub water sending port 4 to the side and bending the jetting direction so as to be freely moved forward and backward in the axial direction of an insertion part distal end 2 by remote control and moving the stream drawing member 7 forward and backward, the jetting angle of the water W jetted from the sub water sending port 4 is changed corresponding to the above movement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は内視鏡の先端部に関する。 This invention relates to the tip end of the endoscope.

内視鏡には、観察対象粘膜面の汚れや血液等を洗い流すために、挿入部先端の前方に位置する被写体の方向に向けて水を噴出するための副送水口が配置されたものが少なくない。 The endoscope, in order to wash away the dirt and blood like of the observation target the mucosal surface, less those auxiliary water-supply port for ejecting the water in the direction of an object located in front of the insertion tip is placed Absent. そのような内視鏡においては、従来は、副送水口が単純に前方に向かって開口形成されていた(例えば、特許文献1)。 In such an endoscope, conventionally, auxiliary water-supply port has been opened and formed simply forward (e.g., Patent Document 1).
特開2001−292958、段落〔0014〕 JP 2001-292958, paragraph [0014]

上述のように、副送水口が単純に前方に向かって開口形成された構造では、副送水口から噴出される水が観察視野の中心に向かわないので照準をつけ難く、観察対象粘膜面の汚れや血液等を洗い流す操作に手間がかかる場合がある。 As described above, the auxiliary water-supply port is opened formed simply forward structure, difficult with a sight since water ejected from the auxiliary water-supply port is not directed toward the center of the observation field, dirt of the observation target mucosal surface there is a case in which labor is applied to the operation and wash away the blood or the like.

そこで、副送水口を内視鏡の挿入部先端に斜め向きに配置することが考えられるが、そのような構成を採っても、副送水口から噴出された水の位置が観察視野の中心と合致するのは被写体までの距離が所定距離の場合だけで、その距離から離れるに従って副送水口から噴出された水の位置が観察視野の中心から離れてしまう。 Therefore, it is conceivable to arrange the auxiliary water-supply port oblique direction to the leading end of the insertion portion of the endoscope, be adopted such a configuration, the center of the observation field of view position of the ejected water from the auxiliary water-supply port to match only if the distance to the subject is a predetermined distance, the position of the water ejected from the auxiliary water-supply port moves away from the center of the observation field as the distance from that distance.

そこで本発明は、被写体までの距離にかかわらず、副送水口から噴出された水を観察視野の中心位置に吹き付け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。 The present invention, regardless of the distance to the object, and an object thereof is to provide a front end portion of the endoscope can be sprayed to the center position of the observation field a jetted water from the auxiliary water-supply port.

上記の目的を達成するため、本発明の内視鏡の先端部は、挿入部先端の前方に位置する被写体の方向に向けて水を噴出するための副送水口が、挿入部先端の軸線と平行方向に挿入部先端に配置された内視鏡の先端部において、副送水口から噴出される水を側方に引き寄せてその噴出方向を曲げる作用をする水流引寄部材を、遠隔操作により挿入部先端の軸線方向に進退自在に配置して、水流引寄部材を進退させることにより、それに対応して副送水口から噴出される水の噴出角度が変化するようにしたものである。 To achieve the above object, the distal end portion of the endoscope of the present invention, auxiliary water-supply port for ejecting the water in the direction of an object located in front of the insertion portion distal end, the axis of the insertion portion distal end at the tip of the endoscope disposed in the leading end of the insertion portion in the direction parallel to the water flow attracting member that acts to bend the ejection direction of the water ejected from the auxiliary water-supply port attracts laterally, inserted by remote control and retractably disposed in the axial direction of the parts tip, by advancing and retreating the water attracting member, in which the ejection angle of water ejected from the auxiliary water-supply port and correspondingly to such changes.

なお、内視鏡観察像を取り入れるための観察窓が挿入部先端の先端面に配置されると共に、水流引寄部材が副送水口と観察窓との間の位置に設けられていて、副送水口から噴出される水が水流引寄部材に引き寄せられてその噴出方向が観察窓の前方方向に曲げられるようにしてもよく、水流引寄部材が、挿入部先端の先端面から前方に向かって突没するピン状体であってもよい。 Incidentally, the observation window for introducing the endoscope observation image is positioned at the distal end surface of the insertion portion distal end, and water attracting member is provided at a position between the auxiliary water-supply port and the observation window, feeding secondary may also be the ejection direction of water to be ejected are attracted to water attracting member is bent in the forward direction of the observation window from Mizuguchi, water attracting member forwardly from the distal end surface of the insertion portion distal end protruding and retracting may be a pin-shaped body.

本発明によれば、副送水口から噴出される水を側方に引き寄せてその噴出方向を曲げる作用をする水流引寄部材を遠隔操作で進退させることにより、それに対応して副送水口から噴出される水の噴出角度が変化するので、被写体までの距離にかかわらず、副送水口から噴出された水を観察視野の中心位置に吹き付けることができる。 According to the present invention, jet water flow attracting member that acts to bend the ejection direction of the water ejected from the auxiliary water-supply port attracts laterally by advancing and retracting remotely, and correspondingly from auxiliary water-supply port since jet angle of water is changed to be, regardless of the distance to the object, it can be sprayed water ejected from the auxiliary water inlet at the center of the observation field.

挿入部先端の前方に位置する被写体の方向に向けて水を噴出するための副送水口が、挿入部先端の軸線と平行方向に挿入部先端に配置された内視鏡の先端部において、副送水口から噴出される水を側方に引き寄せてその噴出方向を曲げる作用をする水流引寄部材を、遠隔操作により挿入部先端の軸線方向に進退自在に配置して、水流引寄部材を進退させることにより、それに対応して副送水口から噴出される水の噴出角度が変化するようにする。 Auxiliary water-supply port for ejecting the water in the direction of an object located in front of the insertion portion distal end, the distal end portion of the endoscope disposed in the leading end of the insertion portion parallel to the axis of the insertion portion distal end direction, sub the water flow attracting member which serves the water ejected from the water supply port attracts laterally bend the ejection direction, and arranged to freely advance and retreat in the axial direction of the insertion portion distal end by remote control, forward and backward water flow attracting member by, the ejection angle of water ejected from the auxiliary water-supply port correspondingly so as to change.

図面を参照して本発明の実施例を説明する。 With reference to the accompanying drawings illustrating the embodiment of the present invention.
図4は内視鏡の全体構成を示しており、可撓管状の挿入部1の先端には対物光学系等を内蔵する先端部本体2が連結され、挿入部1の基端には操作部3が連結されている。 Figure 4 shows the overall configuration of an endoscope, the distal end portion main body 2 having a built-in objective optical system and the like is connected to the distal end of the insertion portion 1 of the flexible tubular and the proximal end of the insertion portion 1 operating unit 3 is connected.

先端部本体2の先端面2aには、その前方に位置する被写体の方向に向けて水を噴出するための副送水口4が配置されており、その副送水口4に連通する送水チューブ5が挿入部1内から操作部3内にわたって挿通配置され、送水チューブ5に注水をする注水口金6が操作部3の上端部に配置されている。 The distal end surface 2a of the distal end portion main body 2, in the direction of the subject located in front are auxiliary water-supply port 4 disposed for ejecting water, the water supply tube 5 communicating with the auxiliary water-supply port 4 is inserted and arranged over inside the operation unit 3 from the insertion portion within 1, water injection die 6 for a water injection to the water supply tube 5 is disposed at an upper end portion of the operation portion 3.

また、副送水口4から噴出される水を側方に引き寄せてその噴出方向を曲げる作用をする水流引寄部材7が、副送水口4と並んで先端部本体2の先端面2aから突没自在に設けられている。 Further, protruding and retracting the water ejected from the auxiliary water-supply port 4 water attracting member 7 which acts to bend the ejection direction attracted laterally, from the distal end surface 2a of the distal end portion main body 2 along with auxiliary water-supply port 4 It is provided freely.

そして、水流引寄部材7を先端部本体2の軸線方向に進退操作するための操作ノブ8が操作部3に配置されていて、挿入部1内から操作部3内に引き通された操作ワイヤ9により操作ノブ8の動作が水流引寄部材7に伝達される。 The operating wire operation knob 8 for advancing and retracting operation of the water flow attracting member 7 in the axial direction of the distal end portion main body 2 has been arranged in the operation portion 3, was led through the inside the insertion portion 1 in the operation portion 3 operation of the operation knob 8 is transmitted to the water flow attracting member 7 by 9.

図5、図6は内視鏡の挿入部1の先端部分を示しており、先端部本体2の先端面2aには、図5に示されるように、内視鏡観察像を取り入れるための観察窓11と、観察範囲に向かって照明光を放射するための照明窓12が並んで配置されている。 5, FIG. 6 shows the leading end of the insertion portion 1 of the endoscope, the distal end surface 2a of the distal end portion main body 2, as shown in FIG. 5, the observation for taking endoscopic observation image a window 11, illumination window 12 for emitting illumination light toward the observation range are arranged side by side. 13は処置具突出口、14は、観察窓11の表面に向かって開口配置された送気送水ノズルである。 13 the treatment instrument projection port 14 is a gas-feeding and water-feeding nozzle which is opened disposed toward the surface of the observation window 11.

観察窓11の後方位置の先端部本体2内には、図6に示されるように対物光学系15が配置されている。 In the distal end portion main body 2 of the rear position of the observation window 11, an objective optical system 15 is arranged as shown in FIG. そして、その対物光学系15による被写体の投影位置に固体撮像素子16の撮像面が配置されていて、先端部本体2の真っ直ぐ前方が内視鏡観察される。 And that have imaging surface of the solid-state imaging device 16 to the projection position of the object by the objective optical system 15 is disposed in the straight forward tip body 2 is observed endoscope.

17は、先端部本体2の軸線と平行方向に先端部本体2に貫通形成された通水孔であり、その後端には送水チューブ5に接続され、通水孔17の先端開口が副送水口4になっている。 17 is a water passage hole formed through the axial direction parallel to the distal end portion main body 2 of the distal end portion main body 2, at its rear end is connected to the water supply tube 5, the distal end opening of the water passage holes 17 are auxiliary water-supply port It has become 4. 通水孔17の断面形状は正円形であり、その断面形状のまま真っ直ぐ前方に向かって先端面2aにおいて副送水口4として開口している。 Cross-sectional shape of the water passage holes 17 are positive circular and opened as a sub-water supply port 4 at the distal end surface 2a straight forward while the cross-sectional shape.

水流引寄部材7は、断面形状が正円形の細長いピン状に形成されていて、副送水口4の辺縁の近傍であって副送水口4と観察窓11との間の位置に真っ直ぐ前方に向けて軸線方向に進退自在に配置されている。 Water attracting member 7, the cross-sectional shape have been formed in a round elongated pin-shaped, straight position between a vicinity of the edge of the auxiliary water-supply port 4 and the sub water feed port 4 and the observation window 11 forward It is movably disposed in the axial direction towards the. 18はシール用のOリングである。 18 is an O-ring seal.

水流引寄部材7の後端には操作ワイヤ9の先端が連結固着されており、操作部3からの遠隔操作によって操作ワイヤ9を進退させると、図6に二点鎖線で示されるように、水流引寄部材7が先端部本体2の先端面2aから突没する。 The rear end of the water flow attracting member 7 are fixed connected the tip of the operation wire 9, the advancing and retracting the operation wire 9 by remote control from the operating unit 3, as shown in FIG. 6 with two-dot chain line, water attracting member 7 is project and retract from the distal end surface 2a of the distal end portion main body 2.

ただし水流引寄部材7は、先端部本体2と水流引寄部材7の後端近傍部とに向かい合って形成されたストッパ用段部A,Bどうしが当接する状態になると、それ以上は先端部本体2の先端面2aから突出することができないようになっている。 However water attracting member 7, the distal end portion main body 2 and the water flow attracting member 7 near the rear end portion and is opposed to formed on the stopper stepped portion A of the to what B is in a state abutting, more the tip so as not be able to protrude from the distal end surface 2a of the body 2.

このように構成された実施例の内視鏡の先端部においては、図6に示されるように、水流引寄部材7が先端部本体2の先端面2a内に引っ込んでいるかあまり突出していない状態のときは、副送水口4から真っ直ぐ前方に噴出水Wが噴出される。 State thus in the distal end portion of the endoscope of the embodiment constructed, which as shown in FIG. 6, no or less projecting water attracting member 7 is retracted into the distal end surface 2a of the distal end portion main body 2 when the, jetting water W is injected straight forward from auxiliary water-supply port 4.

そして、図7に示されるように、水流引寄部材7を先端部本体2の先端面2aから徐々に前方に突出させて水流引寄部材7の突出長がある程度に達すると、噴出水Wが水流引寄部材7の方に引き寄せられてその噴出方向が観察窓11の前方方向に曲げられる。 Then, as shown in Figure 7, the protruding length of the water flow attracting member 7 gradually protruding forward water flow attracting member 7 from the distal end surface 2a of the distal end portion main body 2 reaches a certain degree, jetting water W the ejection direction is bent in a forward direction of the observation window 11 is attracted toward the water flow attracting member 7.

このように、本来は噴出水Wが真っ直ぐ前方に噴出される副送水口4の前方を遮らずに、噴出水Wの本来の噴出方向に対して平行に水流引寄部材7を突出させることにより噴出水Wが水流引寄部材7に引き寄せられて曲がるのは、水流引寄部材7と平行に流体(噴出水W)が流れることによりその間の部分が負圧になって噴出水Wが水流引寄部材7側に寄せられ、それによって噴出水Wが水流引寄部材7に触れると、その後は水の表面張力により噴出水Wが水流引寄部材7にくっついた状態になることによると思われる。 Thus, originally without blocking the front of the auxiliary water-supply port 4 jetting water W is straight ejected forwardly, by parallel projecting the water flow attracting member 7 with respect to the original ejection direction of the ejection water W the jetting water W bends are attracted to the water flow attracting member 7 is jetted water W flow pull in between portions a negative pressure by flowing water attracting member 7 in parallel with the fluid (water jet W) provided by, the nearest member 7 side, it seems whereby the water jet W touches the water flow attracting member 7, then to be due to a state where water jet W is stuck to the water flow attracting member 7 by the surface tension of water .

そして、図7、図8及び図1に順に示されるように、先端部本体2の先端面2aからの水流引寄部材7の突出長を次第に大きくすると、噴出水Wが水流引寄部材7を伝って真っ直ぐ寄りに進むようになって、噴出水Wの曲がり角度が次第に小さくなり、ストッパ用段部A,Bが当接する図1の状態で曲がり角度が最小になる。 Then, Figure 7, as shown in sequence in FIGS. 8 and FIG. 1, when gradually increasing the protruding length of the water flow attracting member 7 from the distal end surface 2a of the distal end portion main body 2, jetting water W to flow attracting member 7 along so proceeds straight toward it, bending angle of the jetting water W becomes gradually smaller, the stopper step portion a, and B skew angle is minimized in the Fig 1 abutting state.

したがって、操作部3からの遠隔操作により水流引寄部材7を軸線方向に進退操作することにより、副送水口4からの噴出水Wの噴出角度を任意に変化させて、被写体までの距離がどのように変化した場合であっても、観察視野の中心位置にある粘膜面に対して噴出水Wを吹き付けて汚物や血液等を容易に洗浄することができる。 Accordingly, by advancing and retracting operation of the water flow attracting member 7 in the axial direction by remote control from the operating unit 3, by arbitrarily changing the jetting angle of the jetting water W from the secondary water supply port 4, the distance to the subject is any even when the changes as a by blowing jet water W filth, blood or the like can be easily cleaned for the mucosal surface in the center position of the observation field of view.

図2及び図3は、副送水口4と水流引寄部材7との間の間隔eを変化させた場合に、副送水口4からの水流引寄部材7の突出長Lをどの程度にすると噴出水Wが曲がるかを実験したときの実験結果を示しており、水流引寄部材7の直径dはd=0.33mm、副送水口4の直径DはD=0.5mmである。 2 and 3, in the case of changing the distance e between the auxiliary water-supply port 4 and the water flow attracting member 7, when the degree of the projection length L of water attracting member 7 from the secondary water supply port 4 shows the experimental results when experiments or jetting water W is bent, the diameter d of the water flow attracting member 7 d = 0.33 mm, the diameter D of the auxiliary water-supply port 4 is D = 0.5 mm.

この実験結果から、副送水口4と水流引寄部材7との間の間隔eが0.5mmを越えない(e≦0.5mm)範囲にある必要があり、eが0.25mm以下では噴出水Wの状態が不安定で水流引寄部材7がほとんど突出していなくても噴出水Wが曲がったりするので、副送水口4と水流引寄部材7との間の間隔eは0.3mm〜0.5mmの範囲に設定するのが望ましい。 From the experimental results, the spacing e between the auxiliary water-supply port 4 and the water flow attracting member 7 must be in the (e ≦ 0.5 mm) range not exceeding 0.5 mm, e is ejected at 0.25mm or less since water W state unstable water attracting member 7 is bent or jetting water W even without almost protruding spacing e between the auxiliary water-supply port 4 and the water flow attracting member 7 0.3mm~ it is desirable to set the range of 0.5 mm.

なお、本発明は上記実施例に限定されるものではなく、例えば副送水口4から噴出される噴出水Wの曲がり方向が観察窓11の前方方向に向かわない構成であっても本発明を適用することができる。 Incidentally, the present invention is not limited to the above embodiments, for example, even the invention have a structure that does not travel in the forward direction of the bending direction observation window 11 of the jetting water W ejected from the auxiliary water-supply port 4 can do.

本発明の実施例の内視鏡の先端部の水流引寄部材が最大限まで突出した状態の側面断面図である。 Water attracting members of the distal end of the endoscope in an embodiment of the present invention is a side sectional view of a state of protruding to the maximum. 本発明の実施例の副送水口と水流引寄部材との間の間隔と副送水口から噴出する噴出水の曲がり発生との関係を明らかにする実験に用いられた内視鏡の先端部の部分側面断面図である。 Spacing the tip portion of the endoscope used in relation reveal experiments with auxiliary water-supply port of the water jet ejected from bending occurs between the auxiliary water-supply port and the water flow attracting member embodiment of the present invention partial side cross-sectional views. 本発明の実施例の副送水口と水流引寄部材との間の間隔と副送水口から噴出する噴出水の曲がり発生との関係を明らかにする実験結果を示す図表である。 Is a table showing the intervals and revealing experiments the relationship between the bending occurrence of jetting water jetting from the secondary water supply port between the auxiliary water-supply port and the water flow attracting member embodiment of the present invention. 本発明の実施例の内視鏡の全体構成を示す側面図である。 Is a side view showing the overall configuration of an endoscope of an embodiment of the present invention. 本発明の実施例の内視鏡の先端部の斜視図である。 It is a perspective view of a distal end portion of the endoscope of the embodiment of the present invention. 本発明の実施例の内視鏡の先端部の側面断面図である。 It is a side cross-sectional view of the distal end portion of the endoscope of the embodiment of the present invention. 本発明の実施例の内視鏡の先端部の水流引寄部材が途中まで突出した状態の側面断面図である。 Water attracting members of the distal end of the endoscope in an embodiment of the present invention is a side sectional view of a state of protruding halfway. 本発明の実施例の内視鏡の先端部の水流引寄部材が途中まで突出した状態の側面断面図である。 Water attracting members of the distal end of the endoscope in an embodiment of the present invention is a side sectional view of a state of protruding halfway.

符号の説明 DESCRIPTION OF SYMBOLS

1 挿入部 2 先端部本体(挿入部先端) 1 insertion portion 2 the distal end portion main body (insertion tip)
2a 先端面 3 操作部 4 副送水口 7 水流引寄部材 8 操作ノブ 9 操作ワイヤ 11 観察窓 17 通水孔 W 噴出水 2a distal end surface 3 Operation unit 4 auxiliary water-supply port 7 water attracting member 8 operating knob 9 operating wire 11 observation window 17 water passage holes W jetted water

Claims (3)

  1. 挿入部先端の前方に位置する被写体の方向に向けて水を噴出するための副送水口が、上記挿入部先端の軸線と平行方向に上記挿入部先端に配置された内視鏡の先端部において、 Auxiliary water-supply port for ejecting the water in the direction of an object located in front of the insertion portion distal end, the distal end portion of the endoscope disposed in the leading end of the insertion portion in the direction parallel to the axis of the insertion portion distal end ,
    上記副送水口から噴出される水を側方に引き寄せてその噴出方向を曲げる作用をする水流引寄部材を、遠隔操作により上記挿入部先端の軸線方向に進退自在に配置して、上記水流引寄部材を進退させることにより、それに対応して上記副送水口から噴出される水の噴出角度が変化するようにしたことを特徴とする内視鏡の先端部。 The water flow attracting member that acts to bend the ejection direction attract water ejected from the auxiliary water inlet laterally disposed retractably in the axial direction of the insertion portion distal end by remote control, the flow pull by advancing and retracting the preferred member, the distal end portion of the endoscope correspondingly characterized in that as ejection angle of water ejected from the auxiliary water-supply port is changed.
  2. 内視鏡観察像を取り入れるための観察窓が上記挿入部先端の先端面に配置されると共に、上記水流引寄部材が上記副送水口と上記観察窓との間の位置に設けられていて、上記副送水口から噴出される水が上記水流引寄部材に引き寄せられてその噴出方向が上記観察窓の前方方向に曲げられる請求項1記載の内視鏡の先端部。 With an observation window for taking endoscopic observation image is positioned on the distal end surface of the leading end of the insertion portion, the water flow attracting member is provided at a position between the auxiliary water-supply port and the observation window, distal end portion of the endoscope in the auxiliary water-supply port thereof ejection direction water ejected are attracted to the water flow attracting member from the claim 1 to be bent in the forward direction of the observation window.
  3. 上記水流引寄部材が、上記挿入部先端の先端面から前方に向かって突没するピン状体である請求項1又は2記載の内視鏡の先端部。 The water flow attracting member, the distal end portion of an endoscope according to claim 1 or 2, wherein the pin-shaped member to project and retract toward the front from the front end face of the leading end of the insertion portion.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006345958A (en) * 2005-06-14 2006-12-28 Pentax Corp Distal end part of endoscope
US8016753B2 (en) 2005-06-09 2011-09-13 Hoya Corporation Endoscope

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JPH01204637A (en) * 1988-02-12 1989-08-17 Olympus Optical Co Ltd Endoscope
JP2002330920A (en) * 2001-05-10 2002-11-19 Asahi Optical Co Ltd Distal end of endoscope for medical treatment
JP2004049452A (en) * 2002-07-18 2004-02-19 Pentax Corp Endoscope equipped with auxiliary water feed port
JP2004141285A (en) * 2002-10-23 2004-05-20 Pentax Corp Fluid jetting apparatus for endoscope
JP2004174157A (en) * 2002-11-29 2004-06-24 Pentax Corp Fluid jet device of endoscope

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Publication number Priority date Publication date Assignee Title
JPH01204637A (en) * 1988-02-12 1989-08-17 Olympus Optical Co Ltd Endoscope
JP2002330920A (en) * 2001-05-10 2002-11-19 Asahi Optical Co Ltd Distal end of endoscope for medical treatment
JP2004049452A (en) * 2002-07-18 2004-02-19 Pentax Corp Endoscope equipped with auxiliary water feed port
JP2004141285A (en) * 2002-10-23 2004-05-20 Pentax Corp Fluid jetting apparatus for endoscope
JP2004174157A (en) * 2002-11-29 2004-06-24 Pentax Corp Fluid jet device of endoscope

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8016753B2 (en) 2005-06-09 2011-09-13 Hoya Corporation Endoscope
JP2006345958A (en) * 2005-06-14 2006-12-28 Pentax Corp Distal end part of endoscope
JP4708873B2 (en) * 2005-06-14 2011-06-22 Hoya株式会社 Distal end portion of the endoscope

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