JPH01300939A - Ultrasonic diagnostic apparatus for body cavity - Google Patents
Ultrasonic diagnostic apparatus for body cavityInfo
- Publication number
- JPH01300939A JPH01300939A JP13312788A JP13312788A JPH01300939A JP H01300939 A JPH01300939 A JP H01300939A JP 13312788 A JP13312788 A JP 13312788A JP 13312788 A JP13312788 A JP 13312788A JP H01300939 A JPH01300939 A JP H01300939A
- Authority
- JP
- Japan
- Prior art keywords
- center
- ultrasonic
- ultrasound
- tip
- body cavity
- 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.)
- Granted
Links
- 230000037431 insertion Effects 0.000 claims abstract description 49
- 238000003780 insertion Methods 0.000 claims abstract description 49
- 238000002604 ultrasonography Methods 0.000 claims description 34
- 238000005286 illumination Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 9
- 230000003902 lesion Effects 0.000 description 7
- 210000001198 duodenum Anatomy 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- Ultra Sonic Daignosis Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、体腔内への挿入部に超音波振動子を設８Ｊで
被検対象体を超音波走査する体腔内超音波診断装置に関
するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an intrabody cavity ultrasonic diagnostic apparatus that includes an ultrasonic transducer in an insertion portion into a body cavity and performs ultrasonic scanning of a subject to be examined using an 8J. It is.
体腔内超音波診断装置は、挿入部の先端に超音波振動子
を設け、この超音波振動子からの超音波を挿入方向中心
軸に対して直交方向にラジアル走査するための回転子を
回転自在に設けている。この回転子の周囲には超音波伝
達媒体を充満させ、更にそれらの周囲には超音波入出射
窓である先端カバーを設けている。特願昭６２−２９４
０２５号の体腔内超音波診断装置では、この超音波入出
射窓である先端カバーを挿入部先端の外周面より挿入方
向中心軸寄りに形成（７ている。The intrabody cavity ultrasound diagnostic device has an ultrasound transducer installed at the tip of the insertion section, and a rotor that can rotate freely to radially scan the ultrasound from the ultrasound transducer in a direction orthogonal to the central axis in the insertion direction. It is set up in The area around the rotor is filled with an ultrasonic transmission medium, and a tip cover, which is an ultrasonic input/output window, is provided around the rotor. Patent application 1986-294
In the intracorporeal ultrasound diagnostic apparatus of No. 025, the tip cover, which is the ultrasonic input/output window, is formed closer to the center axis in the insertion direction than the outer circumferential surface of the tip of the insertion section (7).
第４図および第５図に、特願昭６２−２９４０２５号の
体腔内超音波診断装置の挿入部を示す。体腔内超音波診
断装置の挿入部先端１′の先端硬質部２′には、照明レ
ンズ３′、対物レンズ系４′。4 and 5 show the insertion section of the intrabody cavity ultrasonic diagnostic apparatus disclosed in Japanese Patent Application No. 62-294025. An illumination lens 3' and an objective lens system 4' are disposed on the rigid end portion 2' of the insertion section distal end 1' of the intracorporeal ultrasound diagnostic apparatus.
送気送水ノズル５′および吸引口６′が設けられている
。先端硬質部２′の先端には、超音波振動子７′を組み
込んだ回転子８′を設け、これをカバー９′で覆りでい
る。また、観察手段として先端硬質部２′内に固体撮像
素子１０′を内装し、ライトガイドファイバ１５′で伝
送された照明光により、像を撮像できるようになってい
る。An air/water supply nozzle 5' and a suction port 6' are provided. A rotor 8' incorporating an ultrasonic vibrator 7' is provided at the tip of the hard tip portion 2', and is covered with a cover 9'. Further, as an observation means, a solid-state image sensor 10' is installed inside the rigid tip portion 2', and an image can be captured using illumination light transmitted through a light guide fiber 15'.
このように、挿入部先端１′内に、固体撮像素子１０’
と、超音波振動子７′を回転させる回転子８′の、図示
しない回転軸を内装すると、固体撮像素子１０’が挿入
部先端１′の径に対して占める割合が大きく、超音波振
動子７′の回転軸中心が観察光学系の中心軸側とは、挿
入軸中心に対して反対側に位置することとなる。つまり
、超音波振動子７′の回転軸中心として設けられている
先端カバー９′は、その外周の少なくとも一方側は、先
端硬質部２′の外周より内周に入り、段部１４′を形成
する。さらに、第５図に示すように、超音波振動子の走
査する超音波断層像の診断部位と、固体撮像素子１０′
で撮像できる対物レンズ系の視野範囲とが離れているの
で、超音波振動子を病変部に近づけると、光学像に対す
る超音波断層像の位置関係がつけづらくなっていた。In this way, the solid-state image sensor 10' is placed inside the insertion section tip 1'.
If a rotating shaft (not shown) of a rotor 8' that rotates the ultrasonic transducer 7' is installed, the solid-state image sensor 10' occupies a large proportion of the diameter of the insertion section tip 1', and the ultrasonic transducer The center of rotation axis 7' is located on the opposite side of the center axis of the observation optical system with respect to the center of the insertion axis. In other words, at least one side of the outer periphery of the tip cover 9', which is provided as the center of the rotational axis of the ultrasonic transducer 7', goes inward from the outer periphery of the hard tip portion 2', forming a stepped portion 14'. do. Furthermore, as shown in FIG.
Since the field of view of the objective lens system that can be imaged is far away, when the ultrasound transducer is brought closer to the lesion, it becomes difficult to determine the positional relationship of the ultrasound tomographic image to the optical image.
このように、体腔内超音波診断装置の挿入部先端で、超
音波振動子を被う先端カバーが偏心したかたちで先端硬
質部に取付けられ、段部を形成しているものでは、体腔
内のように複雑に屈曲したり、狭い部位が存在する場合
には、先端カバーは狭い部位などへは、簡単に挿入する
ことができるが、先端硬質部の部分では、段部が形成さ
れているため、この段部が体壁に引掛るなどして挿入性
が悪く、患者に苦痛を与えることとなった。また、超音
波振動子を病変部に近づけると、光学像に対する超音波
断層像との位置関係がつけづらいものとなり、この超音
波断層像とを関連づけるための操作が困難となり、その
位置関係を関連づけるために、病変部から超音波振動子
を離すと、鮮明な像を与えることができないなどという
ことがあった。In this way, at the tip of the insertion section of an intracorporeal ultrasound diagnostic device, the tip cover that covers the ultrasonic transducer is attached eccentrically to the hard part of the tip, forming a step, which prevents the inside of the body cavity. If there is a complicated bend or a narrow area, the tip cover can be easily inserted into the narrow area, but the hard part of the tip has a step. However, this stepped portion caught on the body wall, making insertion difficult and causing pain to the patient. Furthermore, when the ultrasound transducer is brought close to the lesion, it becomes difficult to establish the positional relationship between the optical image and the ultrasound tomographic image. Therefore, if the ultrasound transducer is moved away from the lesion, it may not be possible to provide a clear image.
本発明は、上記の点を解決するために、挿入部の挿入性
が良く、また操作性の良い体腔内超音波診断装置を提供
することを目的としたものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide an intra-body cavity ultrasonic diagnostic device that has an insertion section that has good insertability and is easy to operate.
〔課題を解決するための手段および作用〕本発明による
体腔内超音波診断装置は、超音波振動子を回転させて走
査するときの回転軸中心を挿入軸中心に対して傾けて配
置したものである。この、超音波振動子の回転軸中心を
挿入軸中心に対して傾けて配置することで挿入部先端の
段部をなくし、滑らかな形状とすることができ、また、
光学視野内に、超音波診断部位を確認することができる
。[Means and effects for solving the problems] The intrabody cavity ultrasound diagnostic apparatus according to the present invention is arranged so that the center of the rotation axis when rotating and scanning the ultrasound transducer is inclined with respect to the center of the insertion axis. be. By arranging the rotation axis of the ultrasonic transducer at an angle with respect to the insertion axis, the step at the tip of the insertion section can be eliminated and a smooth shape can be achieved.
The ultrasound diagnostic site can be confirmed within the optical field of view.
Ｃ実施例〕 以下、第１図乃至第３図を用いて本発明を説明する。C Example] The present invention will be explained below using FIGS. 1 to 3.
第１図に、本発明の第１実施例を示す。体腔内超音波診
断装置の挿入部先端ｌの先端硬質部２には、照明レンズ
３．対物レンズ系４．送気送水ノズル５．吸引口６が設
けられている。照明レンズ３の内側には、ライトファイ
バーが配設され、内視鏡光源装置等からの照明光を導き
、体腔内を照診するようになっている。また、先端硬質
部２内には、固体撮像素子が配設され、対物レンズ系４
で結像された像を電気信号に変換し、観察モニタ等で画
像として表示し体腔内を観察できるようになっている。FIG. 1 shows a first embodiment of the present invention. An illumination lens 3 is attached to the rigid tip portion 2 of the insertion portion tip l of the intracorporeal ultrasound diagnostic device. Objective lens system 4. Air and water supply nozzle 5. A suction port 6 is provided. A light fiber is disposed inside the illumination lens 3 to guide illumination light from an endoscope light source device or the like to examine the inside of the body cavity. Further, a solid-state image sensor is disposed inside the hard tip portion 2, and an objective lens system 4 is provided.
The image formed by the device is converted into an electrical signal and displayed as an image on an observation monitor, etc., so that the inside of the body cavity can be observed.
この先端硬質部２の先端に超音波振動子７を設けるが、
このとき、超音波振動子７を回転させる回転子８の回転
中心軸Ｂは、内視鏡の挿入軸中心Ａに対して、対物レン
ズ４の配置されていない方向に角度θだけ傾けて配置す
る。そして、この回転子の周囲には超音波伝達媒体を充
満させた超音波入出射窓である先端カバー９を設けてい
る。超音波振動子７の回転軸は、挿入軸中心に対して、
角度θだけ傾いた状態で回転され、超音波の走査を行い
、超音波断層像を得ることができる。An ultrasonic vibrator 7 is provided at the tip of this hard tip portion 2.
At this time, the rotation center axis B of the rotor 8 that rotates the ultrasonic transducer 7 is tilted by an angle θ in the direction in which the objective lens 4 is not arranged with respect to the insertion axis center A of the endoscope. . A tip cover 9, which is an ultrasonic input/output window filled with an ultrasonic transmission medium, is provided around the rotor. The rotation axis of the ultrasonic transducer 7 is relative to the center of the insertion axis.
It is rotated while being tilted by an angle θ, performs ultrasonic scanning, and can obtain an ultrasonic tomographic image.
このように、超音波振動子の回転軸中心を挿入軸中心に
対して傾けて設置することで、挿入部先端１の先端硬質
部２の先端側の形状を滑らかな形状としている。つまり
、第４図に示した従来例のように、先端硬質部２′の対
物レンズ系４′の先端側にできていた段部を形成するこ
とがなくなる。In this way, by installing the ultrasonic transducer with the center of its rotational axis inclined with respect to the center of the insertion axis, the shape of the distal end side of the rigid distal end portion 2 of the distal end of the insertion portion 1 is made to be a smooth shape. That is, unlike the conventional example shown in FIG. 4, there is no need to form a step on the distal end side of the objective lens system 4' of the rigid distal end portion 2'.
このように、挿入部先端１の形状を段差や出張りｐない
滑らかな形状とすることができるので、挿入部を体腔内
に挿入させる際に、挿入部先端にできた段部が体腔内で
引掛り、患者に苦痛を与えるということがなく、体腔内
への挿入性を向上させることができる。In this way, the shape of the tip 1 of the insertion section can be made smooth without any steps or protrusions, so that when the insertion section is inserted into the body cavity, the step formed at the tip of the insertion section does not move inside the body cavity. It does not get caught and cause pain to the patient, and it is possible to improve the ease of insertion into the body cavity.
つぎに、第２図および第３図を用いて本発明の他の実施
例を示す。なお、第１図と同一部材には同−付号を符し
、説明を省略する。Next, another embodiment of the present invention will be shown using FIGS. 2 and 3. Note that the same members as in FIG. 1 are denoted by the same numerals, and their explanations will be omitted.
第２図は、本発明の第２実施例を示し、挿入部先端１の
挿入軸方向の断面図を示す。体腔内に挿入された挿入部
先端１は、体腔内の病変部１２の像を、対物レンズ系４
で、固体撮像素子１０に結像し、固体撮像素子１０は、
対物レンズ系４で結像された像を電気信号に変換し、信
号ケーブル１１で、観察モニタ等に電気信号を伝送し、
画像表示を行うようにしている。FIG. 2 shows a second embodiment of the present invention, and shows a sectional view of the insertion portion distal end 1 in the direction of the insertion axis. The distal end 1 of the insertion section inserted into the body cavity captures an image of the lesion 12 inside the body cavity using the objective lens system 4.
The image is formed on the solid-state image sensor 10, and the solid-state image sensor 10 is
The image formed by the objective lens system 4 is converted into an electrical signal, and the electrical signal is transmitted to an observation monitor or the like via a signal cable 11.
I am trying to display an image.
この実施例において、先端硬質部２の先端側に設ける超
音波振動子の回転的中心Ｂ′は、挿入軸中心Ａ′に対し
て、対物レンズ系４の側にθ′だけ傾けて配置する。In this embodiment, the rotational center B' of the ultrasonic transducer provided on the distal end side of the rigid distal end portion 2 is inclined by θ' toward the objective lens system 4 with respect to the insertion axis center A'.
このように、超音波振動子の回転軸中心Ｂ′を、挿入軸
中心Ａ′に対して対物レンズ系４側に傾げることにより
、対物レンズ系４の視野内に、超音波断層像の面が入っ
てくるようになり、また、病変部１２に対して超音波診
断子を近づけやすくなり、超音波断層像がとり易くなる
。つまり、この実施例では、挿入部先端ｌの先端カバー
９内に設けた超音波振動子の回転軸中心を挿入軸中心を
Ａ′に対して対物レンズ系４側に傾けることによって、
病変部１２に対して超音波振動子をより近づけることが
でき、より病変部１２に近い位置で超音波断層像を有す
ることができる。In this way, by tilting the rotation axis center B' of the ultrasonic transducer toward the objective lens system 4 side with respect to the insertion axis center A', the plane of the ultrasonic tomographic image is placed within the field of view of the objective lens system 4. In addition, it becomes easier to bring the ultrasound diagnostic device closer to the lesion 12, making it easier to take ultrasound tomographic images. That is, in this embodiment, by tilting the rotation axis center of the ultrasonic transducer provided in the tip cover 9 of the insertion section tip l toward the objective lens system 4 side with respect to A',
The ultrasound transducer can be brought closer to the lesion 12, and an ultrasound tomographic image can be obtained at a position closer to the lesion 12.
第３図に、本発明の第３実施例を示す。第３図（８１は
前方斜視型の体腔内超音波診断装置を示しこの実施例で
は、挿入軸中心Ａ″に対して、超音波振動子の回転軸中
心Ｂ″を、対物光学系１３とは反対側に傾けて配置する
。このように、超音波振動子の回転軸中心Ａ″を、挿入
軸中心Ｂ″に対して、対物光学系１３の視野方向とは反
対側に傾けた体腔内超音波診断装置の使用状態を第３図
山）に示す。図では体腔内超音波診断装置の挿入部先端
１が十二指腸まで挿入されている。十二指腸のような部
位では、その臓器内が狭く、挿入部先端１の操作性が悪
く、思うような部位の超音波断層像を得ることができな
くなっている。したがって、この実施例では、このよう
な部位に用いられる前方斜視型の体腔内超音波診断装置
の挿入軸中心Ａ″に対して、先端カバー９内に設けられ
た超音波振動子の回転軸中心Ｂ″を角度θ″だけ、対物
光学系１３とは反対側に傾けて配設している。したがっ
て図示するごとく、体壁に対して直交するような状態で
超音波断層像を有ることができる。つまり従来の、挿入
軸中心の方向と、超音波振動子の回転軸中心どが一敗す
る場合には、十二指腸のように狭く体壁の図示したよう
な部位に対して直交する超音波診断層を得ることは、挿
入部先端の操作性が悪いので困難であったが、この実施
例のように、挿入軸中心Ａ″に対して、超音波振動子の
回転軸中心Ｂ″を対物光学系１３とは反対側に傾けるこ
とで、対物光学系１３の視野を防げることなく、図示す
るような体腔内の部位に対しても、直交するような鮮明
な、超音波断層像を有ることができる。FIG. 3 shows a third embodiment of the invention. FIG. 3 (81 indicates a front perspective type intrabody cavity ultrasound diagnostic device; in this embodiment, the rotational axis center B'' of the ultrasonic transducer with respect to the insertion axis center A'' is different from the objective optical system 13. In this way, the rotational axis center A'' of the ultrasonic transducer is tilted to the opposite side to the viewing direction of the objective optical system 13 with respect to the insertion axis center B''. The state of use of the ultrasound diagnostic device is shown in Figure 3 (Figure 3). In the figure, the distal end 1 of the insertion section of the intracorporeal ultrasonic diagnostic device has been inserted into the duodenum. In a region such as the duodenum, the interior of the organ is narrow and the operability of the tip 1 of the insertion portion is poor, making it impossible to obtain an ultrasound tomographic image of the desired region. Therefore, in this embodiment, the rotation axis center of the ultrasonic transducer provided in the distal end cover 9 is set to B'' is tilted by an angle θ'' to the side opposite to the objective optical system 13. Therefore, as shown in the figure, an ultrasonic tomographic image can be obtained in a state perpendicular to the body wall. In other words, if the conventional direction of the center of the insertion axis and the center of the rotation axis of the ultrasonic transducer fail, ultrasound diagnosis can be performed perpendicular to the narrow body wall area like the duodenum as shown. It was difficult to obtain a layer due to the poor operability of the tip of the insertion part, but as in this example, the rotation axis center B'' of the ultrasonic transducer was aligned with the insertion axis center A'' by the objective optical system. By tilting it to the opposite side from the system 13, it is possible to obtain a clear ultrasonic tomographic image that is perpendicular to the region in the body cavity as shown in the figure, without blocking the field of view of the objective optical system 13. can.
以上説明したように、本発明は、体腔内超音波診断装置
の挿入軸中心に対して、挿入部の先端に設けられた超音
波振動子の回転軸中心を傾けて配設することによって、
体腔内のように複雑に屈曲していたり、臓器内が狭い場
合でも、体腔内への挿入性、および超音波断層像をとる
ための操作性の良い体腔内超音波診断装置を提供するこ
とができるものである。As explained above, the present invention provides the following advantages: by arranging the rotation axis center of the ultrasonic transducer provided at the tip of the insertion section at an angle with respect to the insertion axis center of the intracorporeal ultrasound diagnostic device,
It is possible to provide an intrabody cavity ultrasound diagnostic device that is easy to insert into a body cavity and easy to operate to take ultrasound tomographic images even when the interior of a body cavity is complicatedly curved or the interior of an organ is narrow. It is possible.
第１図は本発明の第１実施例を示す挿入部先端の拡大図
、第２図は本発明の第２実施例を示す挿入部先端の拡大
図、第３図は本発明の第３実施例を示しくＰｌ）は挿入
部先端の拡大図、（ｂ）は体腔内超音波診断装置を体腔
内に挿入した図５第４図および第５図は従来の体腔内超
音波診断装置を示し、第４図は挿入部先端の拡大図、第
５図は第４図中のＹ−Ｙ断面を示す図である。
１ ・−・−・挿入部先端 ４−・対物レンズ系７
−・−超音波振動子 ８ ・・−回転子Ａ、Ａ’、Ａ
″−・−・挿入軸中心
Ｂ、Ｂ’、Ｂ″ ・・−・・−回転軸中必衰４ 図
＼ ／
＼
＋５’ Ｉ １’
箸５ 図FIG. 1 is an enlarged view of the distal end of the insertion section showing the first embodiment of the present invention, FIG. 2 is an enlarged view of the distal end of the insertion section showing the second embodiment of the present invention, and FIG. 3 is the third embodiment of the present invention. As an example, Pl) is an enlarged view of the tip of the insertion section, and (b) is a diagram showing the intrabody cavity ultrasound diagnostic device inserted into the body cavity.Figures 4 and 5 show the conventional intrabody cavity ultrasound diagnostic device. , FIG. 4 is an enlarged view of the distal end of the insertion portion, and FIG. 5 is a view showing a YY cross section in FIG. 4. 1 ・−・−・Insertion tube tip 4−・Objective lens system 7
-・-Ultrasonic vibrator 8...-Rotor A, A', A
″−・−・Insertion axis center B, B′, B″ ・−・・−Essential loss in rotating shaft 4 Figure ＼ / ＼ +5' I 1' Chopsticks 5 Figure
Claims (1)
波振動子を回転させ超音波入出射窓から超音波を入出射
させて超音波走査する体腔内超音波診断装置において、 前記超音波振動子の回転軸中心を挿入軸中心に対して傾
けて配置したことを特徴とする体腔内超音波診断装置。[Claims] Intrabody cavity ultrasound scanning in which an ultrasound transducer is provided at the distal end of insertion into a body cavity, and the ultrasound transducer is rotated to input and output ultrasound through an ultrasound input/output window. An intrabody cavity ultrasonic diagnostic apparatus, characterized in that the ultrasonic transducer is arranged such that the rotational axis center of the ultrasonic transducer is inclined with respect to the insertion axis center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63133127A JP2758169B2 (en) | 1988-05-31 | 1988-05-31 | Ultrasonic diagnostic device in body cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63133127A JP2758169B2 (en) | 1988-05-31 | 1988-05-31 | Ultrasonic diagnostic device in body cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01300939A true JPH01300939A (en) | 1989-12-05 |
| JP2758169B2 JP2758169B2 (en) | 1998-05-28 |
Family
ID=15097415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63133127A Expired - Fee Related JP2758169B2 (en) | 1988-05-31 | 1988-05-31 | Ultrasonic diagnostic device in body cavity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2758169B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002238836A (en) * | 2001-02-16 | 2002-08-27 | Asahi Optical Co Ltd | Duodenum endoscope |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56152635A (en) * | 1980-04-28 | 1981-11-26 | Olympus Optical Co | Ultrasonic diagnosis apparatus |
| JPS60234646A (en) * | 1984-05-07 | 1985-11-21 | 松下電器産業株式会社 | Ultrasonic probe |
-
1988
- 1988-05-31 JP JP63133127A patent/JP2758169B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56152635A (en) * | 1980-04-28 | 1981-11-26 | Olympus Optical Co | Ultrasonic diagnosis apparatus |
| JPS60234646A (en) * | 1984-05-07 | 1985-11-21 | 松下電器産業株式会社 | Ultrasonic probe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002238836A (en) * | 2001-02-16 | 2002-08-27 | Asahi Optical Co Ltd | Duodenum endoscope |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2758169B2 (en) | 1998-05-28 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |