JPH11244220A - Fluorescent endoscope - Google Patents
Fluorescent endoscopeInfo
- Publication number
- JPH11244220A JPH11244220A JP10050497A JP5049798A JPH11244220A JP H11244220 A JPH11244220 A JP H11244220A JP 10050497 A JP10050497 A JP 10050497A JP 5049798 A JP5049798 A JP 5049798A JP H11244220 A JPH11244220 A JP H11244220A
- Authority
- JP
- Japan
- Prior art keywords
- insertion tube
- light
- excitation light
- frame
- optical system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は蛍光内視鏡に関し、
特に詳細には、挿入管の先端部を生体内部の観察部位に
十分近づけて、高画質の蛍光画像を観察可能にした蛍光
内視鏡に関するものである。The present invention relates to a fluorescent endoscope,
More particularly, the present invention relates to a fluorescence endoscope in which a distal end portion of an insertion tube is sufficiently close to an observation site inside a living body so that a high-quality fluorescence image can be observed.
【0002】[0002]
【従来の技術】従来より、例えば特開平7−22271
2号に示されるように、生体内部に挿入される挿入管
と、この挿入管内に収められて生体内部に励起光を照射
する送光光学系と、挿入管内に収められ、励起光の照射
を受けて生体から生じた蛍光を受光する受光光学系とを
有する蛍光内視鏡が知られている。2. Description of the Related Art Conventionally, for example, Japanese Unexamined Patent Application Publication No.
As shown in No. 2, an insertion tube inserted into the living body, a light transmitting optical system that is housed in the insertion tube and irradiates the living body with excitation light, and an irradiation tube that is housed in the insertion tube and emits the excitation light. 2. Description of the Related Art A fluorescence endoscope having a light receiving optical system that receives fluorescence generated from a living body upon reception is known.
【0003】上述の蛍光としては、生体自身が発する自
家蛍光と、生体の観察部位に予め含ませた薬剤による蛍
光とがある。このような蛍光による画像を撮像して観察
したり、あるいはその強度を測定することにより、例え
ば癌の浸潤範囲を特定する等のことが可能になる。[0003] As the above-mentioned fluorescence, there are auto-fluorescence emitted by the living body itself, and fluorescence by a drug previously contained in the observation site of the living body. By capturing and observing an image of such fluorescence or measuring its intensity, it becomes possible to specify, for example, a cancer infiltration range.
【0004】なお、生体の観察部位に照射した励起光の
一部はそこで反射して、蛍光受光光学系に向かって進む
こともある。このような反射励起光を蛍光とともに検出
してしまうと、観察部位の状態を正確に反映していない
蛍光画像が撮像されたり、蛍光強度の測定が不正になさ
れてしまう。そこで多くの場合は、蛍光受光光学系の前
に励起光カットフィルタを配して、不要な励起光をそこ
でカットするようにしている。[0004] A part of the excitation light applied to the observation site of the living body may be reflected there and proceed toward the fluorescence receiving optical system. If such reflected excitation light is detected together with the fluorescence, a fluorescence image that does not accurately reflect the state of the observation site is captured, or the measurement of the fluorescence intensity is incorrectly performed. Therefore, in many cases, an excitation light cut filter is disposed in front of the fluorescence receiving optical system, and unnecessary excitation light is cut there.
【0005】[0005]
【発明が解決しようとする課題】ところで、上述のよう
にして生体から発せられる蛍光は、通常極めて微弱なも
のである。そのような蛍光を効率良く検出する上では、
送光光学系および受光光学系を収めている挿入管の先端
を、できるだけ生体の観察部位に近付けるのが有利であ
る。By the way, the fluorescence emitted from the living body as described above is usually extremely weak. In order to detect such fluorescence efficiently,
It is advantageous to bring the distal end of the insertion tube containing the light transmitting optical system and the light receiving optical system as close as possible to the observation site of the living body.
【0006】しかし従来の蛍光内視鏡では、挿入管の先
端を観察部位に近付け過ぎることにより、励起光照射範
囲と撮像範囲とが極めて狭くなって互いに離れてしま
い、撮像不可能になるという問題が認められていた。However, in the conventional fluorescent endoscope, when the distal end of the insertion tube is too close to the observation site, the excitation light irradiation range and the imaging range become extremely narrow and separated from each other, so that imaging becomes impossible. Was recognized.
【0007】また、前述のように蛍光強度に基づいて癌
の浸潤範囲を特定する等の場合は、挿入管の先端と観察
部位との間の距離や励起光照度に応じて、受光蛍光強度
を補正する必要があるが、従来の蛍光内視鏡では上記距
離を測定するのが困難であることから、この補正を行な
うのは非常に面倒となっていた。In the case where the invasion range of the cancer is specified based on the fluorescence intensity as described above, the received fluorescence intensity is corrected according to the distance between the tip of the insertion tube and the observation site and the illuminance of the excitation light. However, since it is difficult to measure the distance with a conventional fluorescent endoscope, it is very troublesome to perform this correction.
【0008】他方、蛍光の波長は生体の部位や使用薬剤
によって異なるので、前述した励起光カットフィルタ
は、これら生体の部位や使用薬剤に応じて取り替えなけ
ればならないことが多い。従来の蛍光内視鏡において
は、この励起光カットフィルタの取替えが面倒なものと
なっていた。On the other hand, since the wavelength of the fluorescent light varies depending on the part of the living body and the medicine used, the above-described excitation light cut filter often needs to be replaced according to the part of the living body and the medicine used. In a conventional fluorescence endoscope, replacement of the excitation light cut filter has been troublesome.
【0009】本発明は上記の事情に鑑みてなされたもの
であり、撮像不可能の事態を招くことなく、常に挿入管
の先端を観察部位に十分近付けることができ、その上、
受光蛍光強度の補正や励起光カットフィルタの取替えも
容易な蛍光内視鏡を提供することを目的とする。The present invention has been made in view of the above circumstances, and can always bring the distal end of an insertion tube sufficiently close to an observation site without causing a situation in which imaging is impossible.
It is an object of the present invention to provide a fluorescence endoscope that can easily correct the intensity of received fluorescence and replace the excitation light cut filter.
【0010】[0010]
【課題を解決するための手段】本発明による蛍光内視鏡
は、前述したような挿入管と、送光光学系と、蛍光受光
光学系とを有する蛍光内視鏡において、平坦な前端が上
記挿入管の先端から所定距離のところに位置する状態に
して、後端部がこの挿入管の先端部に取り外し自在に組
み付けられる枠体と、この枠体に固定されて、受光光学
系に向かう励起光をカットするフィルタとからなるキャ
ップ枠を備えたことを特徴とするものである。According to the present invention, there is provided a fluorescent endoscope having an insertion tube, a light transmitting optical system, and a fluorescent light receiving optical system as described above. The frame is located at a predetermined distance from the distal end of the insertion tube, and the rear end is detachably assembled to the distal end of the insertion tube, and the excitation is fixed to the frame and is directed toward the light receiving optical system. It is characterized by having a cap frame comprising a filter for cutting light.
【0011】なおこの蛍光内視鏡において好ましくは、
上記枠体が、筒状の周囲部分と、その内側に位置して上
記フィルタを保持する部分とを有し、該枠体の前端とな
る上記周囲部分の前端がフィルタを保持する部分よりも
前側に突出するように構成される。Preferably, in this fluorescent endoscope,
The frame has a cylindrical peripheral portion, and a portion located inside thereof for holding the filter, and a front end of the peripheral portion serving as a front end of the frame is forward of a portion holding the filter. It is configured to protrude into.
【0012】一方、上記励起光カットフィルタの周囲に
は、その厚さ方向に延びて励起光を吸収する筒状の励起
光吸収体が配されるのが望ましい。On the other hand, a cylindrical excitation light absorber extending in the thickness direction and absorbing the excitation light is preferably disposed around the excitation light cut filter.
【0013】[0013]
【発明の効果】本発明の蛍光内視鏡においては、平坦な
前端が挿入管の先端から所定距離のところに位置する状
態にして、後端部がこの挿入管の先端部に取り外し自在
に組み付けられる枠体を持つキャップ枠を備えたことに
より、挿入管を観察部位に軽く押し付けると、この枠体
の平坦な前端が観察部位を平坦な状態に押し拡げるよう
になる。In the fluorescent endoscope of the present invention, the flat front end is located at a predetermined distance from the distal end of the insertion tube, and the rear end is detachably assembled to the distal end of the insertion tube. By providing the cap frame having the frame to be inserted, when the insertion tube is lightly pressed against the observation site, the flat front end of the frame pushes the observation site flat.
【0014】この状態において、挿入管の先端から枠体
前端つまり観察部位までは、当然、常に所定距離に保た
れる。したがって、上記所定距離が適当な値となるよう
に枠体形状を設定しておけば、挿入管の先端を観察部位
に近付け過ぎて撮像不可能の事態を招くことなく、常に
挿入管の先端を観察部位に十分近付けることが可能にな
る。In this state, the distance from the distal end of the insertion tube to the front end of the frame, that is, the observation site, is always kept at a predetermined distance. Therefore, if the shape of the frame is set so that the above-mentioned predetermined distance is an appropriate value, the tip of the insertion tube is always brought into contact with the observation region without causing the tip of the insertion tube to be too close to the observation site. It becomes possible to bring it close enough to the observation site.
【0015】観察部位が平坦な状態に押し拡げられてい
れば、この観察部位を明瞭に撮像することも可能とな
る。[0015] If the observation region is pushed and spread in a flat state, it is possible to clearly image the observation region.
【0016】また、上述のように挿入管の先端を観察部
位に十分近付けることができれば、励起光のパワーも低
くて済むようになる。If the tip of the insertion tube can be brought sufficiently close to the observation site as described above, the power of the excitation light can be reduced.
【0017】そして、挿入管の先端から観察部位までが
常に所定距離に保たれれば、この距離を実測する必要が
なくなり、よって受光蛍光強度の補正は非常に簡単なも
のとなる。If the distance from the distal end of the insertion tube to the observation site is always kept at a predetermined distance, there is no need to actually measure this distance, so that the correction of the intensity of the received fluorescent light is very simple.
【0018】また、上記枠体には励起光カットフィルタ
が固定されているから、励起光カットフィルタの取替え
が求められる場合は、この枠体を挿入管の先端部から取
り外して、別の励起光カットフィルタが固定された枠体
を挿入管の先端部に取り付ければよく、フィルタの取替
え作業は極めて容易化される。Further, since the excitation light cut filter is fixed to the frame, if the excitation light cut filter needs to be replaced, the frame is removed from the distal end of the insertion tube and another excitation light cut filter is removed. What is necessary is just to attach the frame to which the cut filter is fixed to the distal end of the insertion tube, and the work of replacing the filter is extremely facilitated.
【0019】なお、励起光カットフィルタの周囲に、そ
の厚さ方向に延びて励起光を吸収する筒状の励起光吸収
体が配されている場合は、観察部位に到達する前にこの
フィルタの周辺で多重反射するなどして該フィルタに周
端側から入射しようとする励起光を、ここで吸収、カッ
トすることができる。In the case where a cylindrical excitation light absorber extending in the thickness direction of the excitation light cut filter and absorbing the excitation light is arranged around the excitation light cut filter, the excitation light cut filter is placed before reaching the observation site. Excitation light that attempts to enter the filter from the peripheral end side due to multiple reflection at the periphery or the like can be absorbed and cut here.
【0020】[0020]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【0021】図1は、本発明の一実施形態による蛍光内
視鏡の要部を示すものであり、また図2は、この蛍光内
視鏡の全体形状を示すものである。図2に示されるよう
にこの蛍光内視鏡は、生体内部に挿入される挿入管10
と、この挿入管10の後端に接続された操作部11と、この
操作部11から延設されたユニバーサルコード12と、この
ユニバーサルコード12に接続された光源および制御ユニ
ット13と、この光源および制御ユニット13に電気的に接
続されたモニタ装置14とを有している。FIG. 1 shows a main part of a fluorescent endoscope according to an embodiment of the present invention, and FIG. 2 shows an overall shape of the fluorescent endoscope. As shown in FIG. 2, the fluorescent endoscope includes an insertion tube 10 inserted into a living body.
An operating unit 11 connected to the rear end of the insertion tube 10, a universal cord 12 extending from the operating unit 11, a light source and a control unit 13 connected to the universal cord 12, And a monitor device 14 electrically connected to the control unit 13.
【0022】上記挿入管10は、先端側から順に硬性の先
端部15、湾曲可能な湾曲部16、および軟性部17から構成
されている。そして上記先端部15には、取り外し自在に
してキャップ枠20が嵌着されている。The insertion tube 10 includes a hard distal end portion 15, a bendable bending portion 16, and a soft portion 17 in this order from the distal end side. A cap frame 20 is detachably fitted to the distal end portion 15.
【0023】図1に示されるように挿入管10内には、光
源および制御ユニット13内の励起光源(図示せず)から
発せられた例えば青紫領域の励起光L1を伝搬させるラ
イトガイド30と、このライトガイド30の先端に近接配置
された照明レンズ31とが収納されている。As shown in FIG. 1, in the insertion tube 10, a light guide 30 for propagating, for example, excitation light L1 in a blue-violet region emitted from an excitation light source (not shown) in the light source and the control unit 13 is provided. An illumination lens 31 disposed close to the tip of the light guide 30 is housed.
【0024】さらに挿入管10内には、上記励起光L1の
照射を受けて生体内の観察部位32から発せられた蛍光L
2を集光する対物レンズ33と、この対物レンズ33の後側
に配されたCCD撮像素子等の撮像素子34と、この撮像
素子34に接続されて光源および制御ユニット13まで延び
る信号線35とが収納されている。Further, in the insertion tube 10, the fluorescent light L emitted from the observation site 32 in the living body upon receiving the irradiation of the excitation light L1 is received.
An objective lens 33 for condensing the light, a CCD image sensor such as a CCD image sensor arranged behind the objective lens 33, a signal line 35 connected to the image sensor 34 and extending to the light source and the control unit 13. Is stored.
【0025】前記キャップ枠20は、図1に示されている
通り、平坦な前端21aが挿入管10の先端10aから所定距
離のところに位置する状態にして、後端部21bが挿入管
先端部15に取り外し自在に嵌着される枠体21と、この枠
体21に固定されたフィルタブロック22とから構成されて
いる。As shown in FIG. 1, the cap frame 20 has a flat front end 21a located at a predetermined distance from the front end 10a of the insertion tube 10, and a rear end 21b is connected to the front end of the insertion tube. A frame 21 is detachably fitted to the frame 15 and a filter block 22 is fixed to the frame 21.
【0026】フィルタブロック22には、図3の正面図に
詳しく示されるように、蛍光L2を透過させる一方励起
光L1をカットする励起光カットフィルタ23と、透明部
材が嵌め込まれて励起光L1を透過させる励起光窓24
と、図示しない送光光学系により送られて来る照明光を
透過させる、透明部材が嵌め込まれた照明光窓25と、鉗
子孔としての貫通孔26とが設けられている。As shown in detail in the front view of FIG. 3, the filter block 22 cuts the excitation light L1 while transmitting the fluorescence L2, and an excitation light cut filter 23, into which a transparent member is fitted so that the excitation light L1 is inserted. Excitation light window 24 to be transmitted
In addition, an illumination light window 25 in which a transparent member is fitted, which transmits illumination light transmitted by a light transmission optical system (not shown), and a through hole 26 as a forceps hole are provided.
【0027】以下、上記構成の蛍光内視鏡の作用につい
て説明する。生体内の観察部位32の蛍光像を撮像する際
には、キャップ枠20を先端部15に嵌着させた上で、挿入
管10が生体内部に挿入される。そしてこの挿入管10を、
例えば消化器官内壁等の観察部位32側に軽く押し付ける
と、キャップ枠20の枠体21の平坦な前端21aが観察部位
32に接してそれを平坦な状態に押し拡げるようになる
(図1の状態)。Hereinafter, the operation of the fluorescent endoscope having the above configuration will be described. When capturing a fluorescent image of the observation site 32 in the living body, the insertion tube 10 is inserted into the living body after the cap frame 20 is fitted to the distal end portion 15. And this insertion tube 10
For example, when lightly pressed against the observation site 32 side, such as the inner wall of the digestive organ, the flat front end 21a of the frame 21 of the cap frame 20 is moved to the observation site 32.
It comes into contact with 32 and pushes it to a flat state (state in FIG. 1).
【0028】また、光源および制御ユニット13内の励起
光源が駆動され、そこから発せられた励起光L1がライ
トガイド30を伝搬し、照明レンズ31および励起光窓24を
経て観察部位32に照射される。励起光L1が照射された
観察部位32からは、蛍光L2(自家蛍光あるいは予め該
観察部位32に含ませておいた薬剤による蛍光)が発せら
れる。この蛍光L2は対物レンズ33により集光されて撮
像素子34に入射するので、この撮像素子34において、蛍
光L2による観察部位32の像が撮像される。Further, the excitation light source in the light source and the control unit 13 is driven, and the excitation light L1 emitted therefrom propagates through the light guide 30, and is irradiated on the observation site 32 through the illumination lens 31 and the excitation light window 24. You. The observation site 32 irradiated with the excitation light L1 emits fluorescence L2 (autofluorescence or fluorescence from a drug previously contained in the observation site 32). Since the fluorescent light L2 is condensed by the objective lens 33 and enters the image pickup device 34, the image of the observation site 32 by the fluorescent light L2 is picked up by the image pickup device 34.
【0029】この蛍光像を示す画像信号は、信号線35を
介して図2の光源および制御ユニット13に入力され、そ
こで適当な処理を受けてからモニタ装置14に送られて、
蛍光像の表示に供せられる。An image signal indicating this fluorescent image is input to the light source and control unit 13 of FIG. 2 through a signal line 35, where it is subjected to appropriate processing and then sent to the monitor device 14,
Used for displaying fluorescent images.
【0030】なお、光源および制御ユニット13には、白
色光である照明光を発する照明光源が設けられ、その照
明光は上記ライトガイド30および照明レンズ31と同様の
光学系を介して観察部位32に照射され得る。そしてこの
照明光による観察部位32の像(通常像)が撮像され、モ
ニタ装置14において再生可能となっているが、この通常
像撮像に関わる手段については、図3に示した照明光窓
25以外、図示を省略してある。The light source and control unit 13 is provided with an illumination light source that emits illumination light that is white light, and the illumination light is transmitted through an optical system similar to the light guide 30 and the illumination lens 31 to the observation site 32. Can be irradiated. Then, an image (normal image) of the observation site 32 is captured by the illumination light and can be reproduced on the monitor device 14. The means relating to the normal image imaging is described with reference to the illumination light window shown in FIG.
Illustrations other than 25 are omitted.
【0031】上述のように枠体前端21aで観察部位32を
押し拡げして蛍光像を撮像する際、挿入管先端10aから
観察部位32までは、当然、常に所定距離に保たれる。し
たがって、上記所定距離が適当な値となるように枠体21
の形状を設定しておけば、挿入管先端10aを観察部位32
に近付け過ぎて撮像不可能の事態を招くことなく、常に
該先端10aを観察部位32に十分近付けることが可能にな
る。As described above, when the observation region 32 is pushed and expanded at the front end 21a of the frame to capture a fluorescent image, the distance from the insertion tube tip 10a to the observation region 32 is naturally kept at a predetermined distance. Therefore, the frame 21 is set so that the predetermined distance has an appropriate value.
If the shape of the insertion tube is set, the insertion tube tip 10a is positioned at the observation site 32.
The leading end 10a can always be sufficiently brought close to the observation region 32 without causing a situation in which imaging is impossible due to being too close to.
【0032】そして、挿入管先端10aから観察部位32ま
でが常に所定距離に保たれれば、この距離を実測する必
要がなくなり、よって、前述した受光蛍光強度の補正は
非常に簡単なものとなる。If the distance from the insertion tube tip 10a to the observation site 32 is always kept at a predetermined distance, there is no need to actually measure this distance, so that the above-described correction of the received light fluorescence intensity becomes very simple. .
【0033】なお、励起光L1の一部は観察部位32で反
射するが、撮像素子34側に向かって進行するこの反射励
起光L1は、励起光カットフィルタ23によってカットさ
れる。Although part of the excitation light L1 is reflected at the observation site 32, the reflected excitation light L1 traveling toward the image sensor 34 is cut by the excitation light cut filter 23.
【0034】それにより、この反射励起光L1が蛍光像
撮像に悪影響を及ぼすことが防止される。This prevents the reflected excitation light L1 from adversely affecting the imaging of the fluorescent image.
【0035】また、観察部位32から生じる蛍光L2の波
長は、この部位や前記薬剤に応じて異なり、該波長に応
じて励起光カットフィルタ23を取り替える必要がある。
本装置において、励起光カットフィルタ23の取替えが求
められる場合は、枠体21を挿入管10の先端部15から取り
外して、別の励起光カットフィルタが固定された枠体21
を挿入管先端部15に取り付ければよいので、フィルタの
取替え作業は極めて容易化される。The wavelength of the fluorescent light L2 generated from the observation site 32 differs depending on the site and the medicine, and it is necessary to replace the excitation light cut filter 23 according to the wavelength.
In the present apparatus, when replacement of the excitation light cut filter 23 is required, the frame 21 is removed from the distal end portion 15 of the insertion tube 10, and the frame 21 to which another excitation light cut filter is fixed.
Can be attached to the insertion tube distal end portion 15, so that the work of replacing the filter is extremely facilitated.
【0036】また、観察部位32が枠体21の作用で平坦な
状態に押し拡げられていれば、この観察部位32を明瞭に
撮像可能となる。Further, if the observation site 32 is expanded and flattened by the action of the frame 21, the observation site 32 can be clearly imaged.
【0037】そして、上述のように挿入管10の先端を観
察部位32に十分近付けることができれば、励起光L1の
パワーも低くて済むようになる。具体的には、挿入管先
端10aと観察部位32との間の距離を、従来一般に設定さ
れていた距離の1/5〜1/10にすることもできる。
そのようにすれば、従来は100mW程度必要とされてい
た励起光L1のパワーが、数mW程度で済むようにな
る。なお上記距離は一例として、挿入管10の直径が10
mm程度の場合で、5〜10mmとなる。If the distal end of the insertion tube 10 can be brought sufficiently close to the observation site 32 as described above, the power of the excitation light L1 can be reduced. More specifically, the distance between the insertion tube tip 10a and the observation site 32 can be set to 1/5 to 1/10 of the conventionally set distance.
By doing so, the power of the pumping light L1, which conventionally required about 100 mW, can be reduced to about several mW. The distance is, for example, 10 mm in diameter of the insertion tube 10.
In the case of about mm, it becomes 5 to 10 mm.
【0038】励起光パワーが上記程度に低くて済むので
あれば、励起光源として、例えば波長403nmの青紫色
のレーザービームを発する半導体レーザー等も使用可能
となる。自家蛍光の場合は、波長400〜410nm付近での
励起効率が良いので、このような半導体レーザーの使用
は特に好ましいと言える。If the power of the excitation light is as low as the above, a semiconductor laser that emits a blue-violet laser beam with a wavelength of 403 nm, for example, can be used as the excitation light source. In the case of autofluorescence, the use of such a semiconductor laser can be said to be particularly preferable because the excitation efficiency is good at a wavelength of about 400 to 410 nm.
【0039】また、励起光パワーが上記程度に低い場合
は、通常像撮像用の照明光の送光光学系と、励起光送光
光学系の大部分を共用化し、通常像撮像時と蛍光像撮像
時とで可動ミラー等で光路を切り替えるようにして、送
光光学系を著しく簡素化することも可能になる。When the power of the excitation light is as low as above, most of the optical system for transmitting the illumination light for capturing the normal image and the optical system for transmitting the excitation light are used in common. The optical path can be switched by a movable mirror or the like between the time of imaging and the light transmission optical system can be significantly simplified.
【0040】なお以上の実施形態において枠体21は、そ
の周囲の筒状部分の前端21aがフィルタブロック22より
も前方に突出した形状とされているが、枠体21の前端が
フィルタブロック22の前面と揃うように、枠体21を断面
「コ」の字状に形成してもよい。In the above embodiment, the front end 21a of the cylindrical portion of the frame 21 has a shape protruding forward from the filter block 22, but the front end of the frame 21 is The frame 21 may be formed in a U-shaped cross section so as to be flush with the front surface.
【0041】次に図4を参照して、本発明の別の実施形
態について説明する。図4は、本発明の別の実施形態に
用いられるキャップ枠40を示すものである。このキャッ
プ枠40は、上述の実施形態に用いられたキャップ枠20と
比べると、励起光カットフィルタ23の周囲に、その厚さ
方向に延びて励起光を吸収する筒状の励起光吸収体41が
配されている点が異なるものである。Next, another embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a cap frame 40 used in another embodiment of the present invention. The cap frame 40 has a cylindrical excitation light absorber 41 extending around the excitation light cut filter 23 in the thickness direction and absorbing the excitation light, as compared with the cap frame 20 used in the above-described embodiment. Is different.
【0042】このような励起光吸収体41を設けておく
と、観察部位に到達する前にフィルタ23の周辺、例えば
励起光窓24の両端面等で多重反射するなどして該フィル
タ23に周端側から入射しようとする励起光を、ここで吸
収、カットすることができる。When such an excitation light absorber 41 is provided, the light is multiply reflected at the periphery of the filter 23, for example, at both end surfaces of the excitation light window 24 before reaching the observation site, so that the periphery of the filter 23 is removed. Excitation light to be incident from the end side can be absorbed and cut here.
【図1】本発明の一実施形態による蛍光内視鏡を示す一
部破断側面図FIG. 1 is a partially cutaway side view showing a fluorescent endoscope according to an embodiment of the present invention.
【図2】図1の蛍光内視鏡の全体形状を示す側面図FIG. 2 is a side view showing the overall shape of the fluorescent endoscope in FIG. 1;
【図3】図1の蛍光内視鏡に用いられたキャップ枠を示
す正面図FIG. 3 is a front view showing a cap frame used in the fluorescent endoscope in FIG. 1;
【図4】本発明の別の実施形態に用いられるキャップ枠
を示す正面図FIG. 4 is a front view showing a cap frame used in another embodiment of the present invention.
10 挿入管 10a 挿入管の先端 12 ユニバーサルコード 13 光源および制御ユニット 14 モニタ装置 15 挿入管の先端部 16 挿入管の湾曲部 17 挿入管の軟性部 20 キャップ枠 21 枠体 21a 枠体の前端 21b 枠体の後端部 22 フィルタブロック 23 励起光カットフィルタ 24 励起光窓 25 照明光窓 30 ライトガイド 31 照明レンズ 32 観察部位 33 対物レンズ 34 撮像素子 35 信号線 40 キャップ枠 41 励起光吸収体 L1 励起光 L2 蛍光 10 Insertion tube 10a Insertion tube tip 12 Universal cord 13 Light source and control unit 14 Monitoring device 15 Insertion tube tip 16 Insertion tube bending portion 17 Insertion tube flexible portion 20 Cap frame 21 Frame 21a Front end 21b Frame Back end of body 22 Filter block 23 Excitation light cut filter 24 Excitation light window 25 Illumination light window 30 Light guide 31 Illumination lens 32 Observation site 33 Objective lens 34 Image sensor 35 Signal line 40 Cap frame 41 Excitation light absorber L1 Excitation light L2 fluorescence
Claims (3)
送光光学系と、 前記挿入管内に収められ、前記励起光の照射を受けて生
体から生じた蛍光を受光する受光光学系とを有する蛍光
内視鏡において、 平坦な前端が前記挿入管の先端から所定距離のところに
位置する状態にして、後端部がこの挿入管の先端部に取
り外し自在に組み付けられる枠体と、この枠体に固定さ
れて、前記受光光学系に向かう励起光をカットするフィ
ルタとからなるキャップ枠を備えたことを特徴とする蛍
光内視鏡。1. An insertion tube inserted into a living body, a light transmitting optical system housed in the insertion tube for irradiating excitation light to the inside of a living body, and a light receiving optical system housed in the insertion tube and receiving the excitation light. A fluorescence endoscope having a light receiving optical system for receiving fluorescence generated from a living body, wherein a flat front end is located at a predetermined distance from a front end of the insertion tube, and a rear end portion of the insertion tube is A fluorescence endoscope comprising: a frame frame detachably assembled to a distal end portion; and a cap frame fixed to the frame frame, the filter frame cutting an excitation light toward the light receiving optical system.
側に位置して前記フィルタを保持する部分とを有し、 該枠体の前端となる前記周囲部分の前端が前記フィルタ
を保持する部分よりも前側に突出していることを特徴と
する請求項1記載の蛍光内視鏡。2. The frame has a cylindrical peripheral part and a part located inside the cylindrical part for holding the filter, and the front end of the peripheral part, which is the front end of the frame, holds the filter. The fluorescent endoscope according to claim 1, wherein the endoscope protrudes forward from a holding portion.
延びて前記励起光を吸収する筒状の励起光吸収体が配さ
れていることを特徴とする請求項1または2記載の蛍光
内視鏡。3. The fluorescent light-emitting device according to claim 1, wherein a cylindrical excitation light absorber extending in a thickness direction of the filter and absorbing the excitation light is arranged around the filter. Endoscope.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10050497A JPH11244220A (en) | 1998-03-03 | 1998-03-03 | Fluorescent endoscope |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10050497A JPH11244220A (en) | 1998-03-03 | 1998-03-03 | Fluorescent endoscope |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11244220A true JPH11244220A (en) | 1999-09-14 |
Family
ID=12860587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10050497A Withdrawn JPH11244220A (en) | 1998-03-03 | 1998-03-03 | Fluorescent endoscope |
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