JPS6311017B2 - - Google Patents
Info
- Publication number
- JPS6311017B2 JPS6311017B2 JP55066892A JP6689280A JPS6311017B2 JP S6311017 B2 JPS6311017 B2 JP S6311017B2 JP 55066892 A JP55066892 A JP 55066892A JP 6689280 A JP6689280 A JP 6689280A JP S6311017 B2 JPS6311017 B2 JP S6311017B2
- Authority
- JP
- Japan
- Prior art keywords
- power laser
- light
- endoscope
- optical fiber
- fiber bundle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000013307 optical fiber Substances 0.000 claims description 24
- 230000003287 optical effect Effects 0.000 claims description 17
- 238000005286 illumination Methods 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims 3
- 238000011282 treatment Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 206010017817 Gastric polyps Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 208000007107 Stomach Ulcer Diseases 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000002496 gastric effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
Description
【発明の詳細な説明】
本発明は、内視鏡パワーレーザの被照射面密度
の安全制御が可能な照射装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an irradiation device capable of safely controlling the density of the irradiated surface of an endoscope power laser.
内視鏡にパワーレーザ光を通すためのフレキシ
ブルな光学繊維束を附設した内視鏡レーザコアグ
レータは、内視鏡操作でもつて、胃漬瘍などにお
ける出血を止めたり、胃ポリープを気化消滅させ
たりなどの治療処理を行うことが出来ることか
ら、消化器領域で盛んに応用されて来ている。 The endoscopic laser coagulator, which is equipped with a flexible optical fiber bundle to pass a power laser beam through the endoscope, can be used to stop bleeding in gastric ulcers and vaporize gastric polyps when operated with an endoscope. It has been widely used in the gastrointestinal field because it can perform therapeutic treatments such as cancer.
ところで、この種のパワーレーザ射出系では、
一般に、導入用光学繊維束の光射出端から出たレ
ーザ光束に広がり向きの射出角を有するものであ
る。そのために、レーザ光の射出位置と被処理面
との間の照射距離によつて、その被処理面でのレ
ーザ光の集光密度が大きく変わつてしまう。しか
も、従来の内視鏡レーザコアグレータでは、体腔
内への挿入使用に際して、レーザ光の照射距離を
確認する方法がなくて、レーザ照射はもつぱら術
者の感に頼つていた。 By the way, in this kind of power laser injection system,
Generally, the laser beam emitted from the light emitting end of the optical fiber bundle for introduction has an emitting angle in the direction of spreading. Therefore, depending on the irradiation distance between the laser beam emission position and the surface to be processed, the condensation density of the laser beam on the surface to be processed changes greatly. Moreover, with conventional endoscopic laser coagulators, when inserted into a body cavity, there is no way to check the irradiation distance of the laser beam, and laser irradiation relies solely on the operator's intuition.
しかして、照射距離に応じて集光密度が変わ
り、即ち、照射パワーが変わるので、前述の従来
手段によるレーザ照射で適正な照射量が把握でき
ない状態下での使用では、不足するパワーレーザ
照射による治療不十分、あるいは、適正量以上の
照射による胃壁などへの穿孔等の不慮の事故が生
じて、十分な効果を挙げられないばかりか極めて
危険なことでもあつた。 However, since the condensed light density changes depending on the irradiation distance, that is, the irradiation power changes, if the laser irradiation using the conventional means described above is used under conditions where the appropriate irradiation amount cannot be determined, the insufficient power laser irradiation Not only was the treatment ineffective, but it was also extremely dangerous due to insufficient treatment or unforeseen accidents such as perforation of the stomach wall due to irradiation exceeding the appropriate amount.
そこで、本発明では、従来の操作手段における
術者の熟練に頼る操作上の問題点に鑑み、パワー
レーザの照射端と被照射面との間が一定距離であ
るときのみ、レーザ照射を可能にすることによ
り、レーザパワーの過不足を防止することを目的
とした内視鏡レーザ照射装置を提供する。 Therefore, in consideration of the operational problems of conventional operating means that depend on the skill of the operator, the present invention enables laser irradiation only when there is a certain distance between the irradiation end of the power laser and the irradiated surface. By doing so, an endoscope laser irradiation device is provided that aims to prevent excess or deficiency of laser power.
以下、図に示した本発明装置の実施例に付いて
説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus of the present invention shown in the drawings will be described below.
第１図は本発明装置を備えた内視鏡の一実施例
を示す側面図、第２図は本発明装置の要部を示す
構成図、手許操作部１から延びる細径の可撓管２
の先端部３には、前記操作部１の接眼部４から延
びる観察用光学繊維束５を介して光学的に連続さ
せた内視窓（対物レンズ７）と、同じく手許操作
部１から可撓管２を通して前記光学繊維束５に併
設したレーザ導入用光学繊維束１０の光射出端と
を臨ませてある。 FIG. 1 is a side view showing an embodiment of an endoscope equipped with the device of the present invention, and FIG. 2 is a configuration diagram showing the main parts of the device of the present invention.
The distal end portion 3 includes an endoscope window (objective lens 7) that is optically continuous via an optical fiber bundle 5 for observation extending from the eyepiece portion 4 of the operating portion 1, and an endoscope window (objective lens 7) that is also accessible from the hand operating portion 1. The light exit end of the optical fiber bundle 10 for laser introduction, which is attached to the optical fiber bundle 5, is exposed through the flexible tube 2.
そして、この先端部３における前記対物レンズ
７とレーザ導入用光学繊維束１０とは、対物レン
ズ７による観察視野８の光軸Ｐに対して、前記光
学繊維束１０の光射出端を一定の距離ｄだけ離れ
た位置で、且つ、該光射出端から照射する後述の
ガイド光の照射域の中心軸Ｑが一定の角度θとな
るように構成してある。 The objective lens 7 and the laser-introducing optical fiber bundle 10 at the tip end 3 are arranged so that the light exit end of the optical fiber bundle 10 is kept at a certain distance from the optical axis P of the observation field 8 by the objective lens 7. The central axis Q of the irradiation area of the guide light, which will be described later, irradiated from the light emitting end is located at a position separated by distance d, and is configured to form a constant angle θ.
一方、レーザ導入用光学繊維束１０の入力端側
には、出力器からのパワーレーザ１１と、該光１
１の光軸と同軸に配置されたガイド用可視光１２
とを、第１リレーレンズ１３でもつて該光学繊維
束１０の入力端面に集光させるようになしてあ
る。 On the other hand, on the input end side of the optical fiber bundle 10 for laser introduction, a power laser 11 from an output device and the light 1
Visible light 12 for guiding arranged coaxially with the optical axis of 1
The first relay lens 13 focuses the light on the input end face of the optical fiber bundle 10.
又、前記観察用光学繊維束５の光入射端面と前
記接眼部４との間には、分割光学素子１８を介在
させ、その分割光学系中に設けた結像レンズ１９
による像を、中央に小径の通過孔２０を穿つたマ
スク板２１を通して光検知器２２によつて受光す
るように構成してある。 A splitting optical element 18 is interposed between the light incident end face of the observation optical fiber bundle 5 and the eyepiece section 4, and an imaging lens 19 is provided in the splitting optical system.
The image is received by a photodetector 22 through a mask plate 21 having a small-diameter passage hole 20 in the center.
そして、該光検知器２２による像の受光信号を
リレー回路部２３に与え、別設のスイツチ回路部
２４からの信号を前記リレー回路２３を経てシヤ
ツター回路部２５に与え、該回路２５を駆動し
て、パワーレーザ光１１を出力させるように構成
してある。 Then, a light reception signal of the image by the photodetector 22 is given to the relay circuit section 23, and a signal from the separately provided switch circuit section 24 is given to the shutter circuit section 25 via the relay circuit 23 to drive the circuit 25. It is configured to output power laser light 11.
第３図は本発明装置を備えた内視鏡接眼部の視
野を示す図で、前記レーザ導入用光学繊維束１０
から出射したスポツト光１５の像１６を視野１４
中に認めることが出来る。その他、１７は前記視
野１４の周辺に設けた指標である。 FIG. 3 is a view showing the visual field of the endoscope eyepiece equipped with the device of the present invention, in which the optical fiber bundle 10 for laser introduction is shown.
The image 16 of the spot light 15 emitted from the field of view 14
It can be recognized inside. Additionally, reference numeral 17 is an index provided around the visual field 14.
このような構成よりなる本発明装置では、レー
ザ導入用光学繊維束１０の光射出軸Ｑを観察用光
学繊維束５の対物レンズ７の光軸Ｐに対して一定
距離ｄだけ離し且つ一定の角度θで交差するよう
に固定してあるので、このレーザ導入用光学繊維
束１０から射出されるレーザ光は、第２図示の如
く、批照射面との間の距離（レーザ出力端と被照
射面との間の高さ）h1，h2及びh3に対して、夫々
s1，s2及びs3の各広がりを持つスポツトとして、
被照射面に照射される。 In the apparatus of the present invention having such a configuration, the light exit axis Q of the optical fiber bundle 10 for laser introduction is separated from the optical axis P of the objective lens 7 of the optical fiber bundle 5 for observation by a certain distance d and at a certain angle. Since they are fixed so as to intersect at θ, the laser beam emitted from the laser introduction optical fiber bundle 10 is transmitted at a distance between the laser output end and the irradiated surface (the distance between the laser output end and the irradiated surface), as shown in the second figure. ) for h 1 , h 2 and h 3 respectively
As a spot with each spread of s 1 , s 2 and s 3 ,
The irradiated surface is irradiated.
そこで、これ等各スポツトs1，s2及びs3の内、
例えばスポツトs2の状態を適正なパワー密度が得
られる状態とすれば、この時の第２図示実施例に
おけるレーザ光の射出軸Ｑの前記光軸Ｐに対する
交差角θは
θ＝tan-1ｄ／h2
の関係式によつて導かれる。 Therefore, among these spots s 1 , s 2 and s 3 ,
For example, if the condition of the spot s2 is such that an appropriate power density can be obtained, the intersection angle θ of the emission axis Q of the laser beam with respect to the optical axis P in the second illustrated embodiment is θ=tan -1 d. It is derived from the relational expression /h 2 .
このような関係下に構成された状態で、本発明
装置の実際の使用時には、先ず、内視鏡操作でも
つて、その可撓管２の先端部４を目的の体腔内部
位に挿入到達させ、レーザ導入用光学繊維束１０
にはパワーレーザ光１１の出力を停止した状態
で、これに替わり同一光軸におかれたガイド用可
視光１２がリレーレンズ１３でもつて光入射端か
ら導入され、その出力端から被照射面（患部）に
向つて照射される。 When the device of the present invention is actually used in a state configured under such a relationship, first, the distal end portion 4 of the flexible tube 2 is inserted into a target intrabody cavity site using an endoscope operation, and Optical fiber bundle 10 for laser introduction
When the output of the power laser beam 11 is stopped, instead of this, the guide visible light 12 placed on the same optical axis is introduced from the light input end of the relay lens 13, and the irradiated surface ( The radiation is directed towards the affected area).
このガイド用可視光１２のスポツト光１５は、
患部との照射距離に応じて、第２図上s1，s2及び
s3の各位置に生じ、この像１６が内視鏡接眼部４
からの覗視視野１４中に、第３図示の如く、認め
られる。 The spot light 15 of this guiding visible light 12 is
Depending on the irradiation distance to the affected area, s 1 , s 2 and
s 3 and this image 16 appears at the endoscope eyepiece 4.
As shown in FIG.
一方、このスポツト光１５の一部は観察用光学
繊維束５の光射出端に臨ませた光分割素子１８で
もつて分割されて、結像レンズ１９によつて、マ
スク板２１上に結像する。 On the other hand, a part of this spot light 15 is also split by a light splitting element 18 facing the light exit end of the optical fiber bundle 5 for observation, and is imaged on a mask plate 21 by an imaging lens 19. .
この状態で、内視鏡先端部３と患部との間の距
離即ちレーザ導入用光学繊維束１０の射出端と被
照明面との間の距離に応じて照射位置s1，s2及び
s3と変わるスポツト光１５が、視野１４中で像
s1′，s2′及びs3′として夫々認められるので、内視
鏡可撓管２の体腔内抜き差し量を加減することに
よつて、指標１７との照合でもつて推測される視
野１４の中心位置に像１６が位置する状態に調整
する。この時、前記光分割素子１９で分割されマ
スク板２１上に結像するスポツト光１５の像も、
該板２１の中心位置に穿つて通過孔２０の位置に
生じ、その結果、該孔２０を通して光検知器２２
を照射する。これによつて、光検知器２２は受光
信号を位置規制信号として、リレー回路部２３に
与え、該回路２３を駆動して、別設のスイツチ回
路部２４をシヤツター回路部２５に接続する回路
切換えを行う。即ち、先の光検知器２２の感知信
号でもつて、スイツチ回路部２４によるシヤツタ
ー回路部２５の制御が可能となる。 In this state, the irradiation positions s 1 , s 2 and
The spot light 15 that changes from s 3 forms an image in the field of view 14.
s 1 ′, s 2 ′, and s 3 ′. Therefore, by adjusting the amount of insertion and removal of the flexible endoscope tube 2 into and out of the body cavity, the field of view 14 estimated by comparing with the index 17 can be adjusted. Adjust so that the image 16 is located at the center position. At this time, the image of the spot light 15 split by the light splitting element 19 and formed on the mask plate 21 is also
A passage hole 20 is formed at the center of the plate 21, so that the photodetector 22 can be passed through the hole 20.
irradiate. As a result, the photodetector 22 applies the received light signal to the relay circuit section 23 as a position regulation signal, drives the circuit 23, and switches the circuit to connect the separately provided switch circuit section 24 to the shutter circuit section 25. I do. That is, the shutter circuit section 25 can be controlled by the switch circuit section 24 even with the sensing signal from the photodetector 22.
この内視鏡調整下でスポツト光１５は位置s2に
あり、この状態でのスポツト光１５の集光密度が
予め設定された値にあるので、手動操作より前記
スイツチ回路部２４を操作して、シヤツター回路
部２５を駆動して、パワーレーザ光１１を出力さ
せることによつて、s2位置の患部を適正なパワー
密度でもつて安全に処置することが出来る。 Under this endoscope adjustment, the spot light 15 is at position s2 , and the convergence density of the spot light 15 in this state is at a preset value, so the switch circuit section 24 is operated by hand. By driving the shutter circuit section 25 to output the power laser beam 11, the affected area at the s2 position can be safely treated with an appropriate power density.
尚、本発明装置のその他の実施例として、図示
していないが、前記マスク板２１を省略して、光
検知器２２の光感応面自体を光の通過孔２０程度
の小径面と構成しても良いし、又、スポツト光１
５を視野１４内で視認し易いための手段として、
観察用照明光との間での輝度差を持たせる他に、
ガイド用可視光１２を色調フイルターを通す等し
て、このスポツト光１５に色調変化を持たせても
良い。 As another embodiment of the device of the present invention, although not shown, the mask plate 21 may be omitted and the photosensitive surface of the photodetector 22 itself may be configured as a small diameter surface with a diameter of about 20 light passage holes. is also good, and spot light 1
As a means for easily recognizing 5 within the visual field 14,
In addition to providing a brightness difference with the observation illumination light,
The visible guide light 12 may be passed through a color tone filter to cause the spot light 15 to have a color tone change.
このように、本発明装置は、パワーレーザの使
用に先き立ち、これと光学的に同一光軸上におか
れたガイド用可視光を用い、その被照明面上のス
ポツト光が内視鏡観察視野の所定の位置に認めら
れた際に、パワーレーザの出力を可能に構成した
ことによつて、適正なパワー密度でもつて一定範
囲の患部へのレーザ照射を行うことが出来て、患
部の照射エネルギーの過不足でもつて穿孔の危険
性あるいは治療不足を防ぎ極めて安全に内視鏡レ
ーザコアグレータを用いることが出来る。 As described above, the device of the present invention uses visible guide light that is optically placed on the same optical axis as the power laser, and the spot light on the illuminated surface is focused on the endoscope. By configuring the power laser to output power when it is detected at a predetermined position in the observation field, it is possible to irradiate a certain range of the affected area with the laser at an appropriate power density. The endoscopic laser coagulator can be used extremely safely by preventing the risk of perforation or insufficient treatment due to excess or deficiency of irradiation energy.
そして、本発明装置は観察視野中で認められる
スポツト光の像位置とこれを感知する光検知器の
位置調整信号との関連によつてパワーレーザの出
力可能な制御を行うものであるので、例えば、レ
ーザ導入用光学繊維束の射出面端部を揺動自在に
構成する等して、レーザの射出角を可変すること
によつて、患部の任意の位置だけを所定量のレー
ザ照射量でもつて照射することが可能であり、更
には、複数個の通過孔を穿つたマスク板又は複数
個の光検知器を設けることにより、これ等複数個
の位置調整手段を選択的に採用することによつ
て、患部に照射されるレーザのパワー密度を加減
して用いることも可能である。 The device of the present invention controls the output of the power laser based on the relationship between the image position of the spot light observed in the observation field and the position adjustment signal of the photodetector that detects the image position, so that, for example, By making the exit surface end of the optical fiber bundle for laser introduction swingable, etc., and varying the laser exit angle, it is possible to apply a predetermined amount of laser irradiation to only an arbitrary location on the affected area. Furthermore, by providing a mask plate with a plurality of passage holes or a plurality of photodetectors, and by selectively employing a plurality of these position adjustment means. Therefore, it is also possible to adjust the power density of the laser irradiated to the affected area.
第１図は本発明装置を用いた内視鏡レーザコア
グレータの一実施例を示す側面図、第２図は本発
明装置の構成要部を示す構成図、第３図は本発明
装置による内視鏡観察視野を示す図である。
１…手許操作部、２…可撓管、３…先端部、４
…接眼部、５…観察用光学繊維束、７…対物レン
ズ、１０…レーザ導入用光学繊維束、１１…パワ
ーレーザ光、１２…ガイド用可視光、１３…リレ
ーレンズ、１４…視野、１５…スポツト光、１６
…像、１７…指標、２０…通過孔、２１…マスク
板、２２…光検知器、２３…リレー回路部、２４
…スイツチ回路部、２５…シヤツター回路部。
Fig. 1 is a side view showing an embodiment of an endoscope laser core grater using the device of the present invention, Fig. 2 is a configuration diagram showing the main components of the device of the present invention, and Fig. 3 is an internal view of the device of the present invention. FIG. 3 is a diagram showing an endoscopic observation field. 1... Hand operation part, 2... Flexible tube, 3... Tip part, 4
... Eyepiece, 5... Optical fiber bundle for observation, 7... Objective lens, 10... Optical fiber bundle for laser introduction, 11... Power laser beam, 12... Visible light for guide, 13... Relay lens, 14... Field of view, 15 ...Spot light, 16
...image, 17...index, 20...passing hole, 21...mask plate, 22...photodetector, 23...relay circuit section, 24
...Switch circuit section, 25...Shutter circuit section.
Claims (1)
て、パワーレーザとその光路上におかれたガイド
用可視光とを入力端面に集光させたパワーレーザ
導入用光学繊維束を、可撓管内に併設し、内視鏡
先端でパワーレーザ導入用光学繊維束の出力端を
観察光学系の内視窓から一定距離だけ離した位置
に配設した内視鏡レーザコアグレータにおいて、
前記観察光学系の視野光軸に対して前記パワーレ
ーザ導入用光学繊維束の光射出光軸が一定の角度
で交叉するように構成し、該パワーレーザ導入用
光学繊維束から射出されるガイド用可視光の像を
前記観察光学系でもつて接眼部に導き、この接眼
部に前記ガイド用可視光像の照合部を設け、これ
等の照合下にパワーレーザを出力可能に制御する
ように構成したことを特徴とする内視鏡レーザ照
射装置。 ２ 前記照合部が接眼部の光軸中心などに小径の
光通過孔を有するマスク板であるところの前記特
許請求の範囲第１項記載の装置。 ３ 前記照合部が接眼部の光軸中心などに配置し
た小径の受光面を有す光感応素子であるところの
前記特許請求の範囲第１項記載の装置。 ４ パワーレーザ出力制御機構が、光検出器で感
知したガイド用可視光像の前記照合信号で駆動さ
れるリレー回路をゲート回路とするスイツチ回路
であるところの前記特許請求の範囲第１項記載の
装置。 ５ 前記ガイド用可視光が観察光学系の照明光に
対して色調又は輝度を変えた光であるところの前
記特許請求の範囲第１項記載の装置。[Scope of Claims] 1. In addition to endoscope functional members such as optical fiber bundles for observation, a power laser introduction device in which a power laser and visible light for guiding placed on its optical path are focused on the input end face. An endoscope laser in which an optical fiber bundle is installed inside a flexible tube, and the output end of the optical fiber bundle for introducing the power laser at the tip of the endoscope is placed a certain distance away from the endoscope window of the observation optical system. In the core greater,
The light emitting optical axis of the optical fiber bundle for power laser introduction is configured to intersect at a certain angle with the viewing optical axis of the observation optical system, and for guiding light emitted from the optical fiber bundle for power laser introduction. A visible light image is guided to an eyepiece by the observation optical system, a collation unit for the guide visible light image is provided in the eyepiece, and a power laser is controlled to be able to output under the collation. An endoscope laser irradiation device characterized by comprising: 2. The device according to claim 1, wherein the verification section is a mask plate having a small diameter light passage hole at the center of the optical axis of the eyepiece section. 3. The device according to claim 1, wherein the verification section is a photosensitive element having a small diameter light receiving surface disposed at the center of the optical axis of the eyepiece section. 4. The power laser output control mechanism according to claim 1, wherein the power laser output control mechanism is a switch circuit whose gate circuit is a relay circuit driven by the verification signal of the guide visible light image detected by a photodetector. Device. 5. The device according to claim 1, wherein the guiding visible light is light whose color tone or brightness is changed from the illumination light of the observation optical system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6689280A JPS56163665A (en) | 1980-05-20 | 1980-05-20 | Endoscope laser irradiating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6689280A JPS56163665A (en) | 1980-05-20 | 1980-05-20 | Endoscope laser irradiating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56163665A JPS56163665A (en) | 1981-12-16 |
| JPS6311017B2 true JPS6311017B2 (en) | 1988-03-10 |
Family
ID=13329013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6689280A Granted JPS56163665A (en) | 1980-05-20 | 1980-05-20 | Endoscope laser irradiating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56163665A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6439089B2 (en) | 2014-05-15 | 2018-12-19 | キヤノン株式会社 | Optical system and endoscope apparatus including the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56145866A (en) * | 1980-04-14 | 1981-11-12 | Asahi Optical Co Ltd | Endoscope laser fiber coagulator |
-
1980
- 1980-05-20 JP JP6689280A patent/JPS56163665A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56145866A (en) * | 1980-04-14 | 1981-11-12 | Asahi Optical Co Ltd | Endoscope laser fiber coagulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56163665A (en) | 1981-12-16 |
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