JP2004159837A - Tip part of radial scan type ultrasonic endoscope - Google Patents

Tip part of radial scan type ultrasonic endoscope Download PDF

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Publication number
JP2004159837A
JP2004159837A JP2002328281A JP2002328281A JP2004159837A JP 2004159837 A JP2004159837 A JP 2004159837A JP 2002328281 A JP2002328281 A JP 2002328281A JP 2002328281 A JP2002328281 A JP 2002328281A JP 2004159837 A JP2004159837 A JP 2004159837A
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Japan
Prior art keywords
distal end
tip part
outer peripheral
ultrasonic endoscope
peripheral surface
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
Application number
JP2002328281A
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Japanese (ja)
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JP4199522B2 (en
Inventor
Tetsuya Tarumoto
哲也 樽本
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Pentax Corp
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Pentax Corp
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Priority to JP2002328281A priority Critical patent/JP4199522B2/en
Publication of JP2004159837A publication Critical patent/JP2004159837A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
    • A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
    • A61B8/445—Details of catheter construction

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tip part of a radial scan type ultrasonic endoscope capable of satisfactorily inserting and disposing a built-in object for obtaining a satisfactory optical observation function into a tip part body. <P>SOLUTION: In the radial scan type ultrasonic endoscope, an optical observation window 2 is disposed on a tip surface 1a of the tip part body 1 connected to the tip of an inserting part, and an annular ultrasonic vibrator 11 is disposed in the outer peripheral part of the tip part body 1. The tip part is formed so that the diameter of the inner surface 11a of the ultrasonic vibrator 11 is at least the diameter of the outer peripheral surface of a rear end part of the tip part body 1 (D1≥D2). <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、挿入部の先端部分の軸線周りに超音波信号の走査をするようにしたラジアル走査型超音波内視鏡の先端部に関する。
【０００２】
【従来の技術】
ラジアル走査型超音波内視鏡は一般に、図２に示されるように、挿入部の先端に連結された先端部本体１の先端面１ａに光学観察窓２と照明窓３が配置され、環状の超音波振動子１１とそれを囲む音響レンズ１２が先端部本体１の外周部分に配置された構成になっている（例えば、特許文献１）。
【０００３】
【特許文献１】
特開２００２−１５３４６９
【０００４】
【発明が解決しようとする課題】
しかし、上述のような従来のラジアル走査型超音波内視鏡においては、超音波振動子１１の内周面１１ａが先端部本体１の外周から相当に奥まった位置に環状に配置されることになるので、観察光学部材、照明部材その他のいわゆる内蔵物５０を後方から先端部本体１の先端面１ａまで通過させるためのスペースが狭められてしまい、十分な光学観察機能を得ることができなかった。
【０００５】
そこで本発明は、十分な光学観察機能を得るための内蔵物を先端部本体内に不足なく挿通配置することができるラジアル走査型超音波内視鏡の先端部を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記の目的を達成するため、本発明のラジアル走査型超音波内視鏡の先端部は、挿入部の先端に連結された先端部本体の先端面に光学観察窓が配置され、先端部本体の外周部分に環状の超音波振動子が配置されたラジアル走査型超音波内視鏡の先端部において、超音波振動子の内周面を、先端部本体の後端部分の外周面の径以上の径に形成したものである。
【０００７】
なお、超音波振動子の外面を囲んで音響レンズが配置されていて、音響レンズの外周面部分が挿入部の先端部分の最大径になっていると、バルーンなしでも超音波断層像を容易に得ることができる。
【０００８】
【発明の実施の形態】
図面を参照して本発明の実施例を説明する。
図１はラジアル走査型超音波内視鏡の先端部を示しており、可撓性挿入部の先端に連結された先端部本体１の先端面には、先端部本体１の前方を視覚的に観察するための光学観察窓２と照明窓３とが並んで配置されており、その他にも、図示されていない処置具突出口等が配置されている。
【０００９】
光学観察窓２の後方位置には、対物光学系４が先端部本体１に内蔵配置されている。そして、その対物光学系４による被写体の投影位置に像入射端面が配置されたイメージガイドファイババンドル５が、先端部本体１に軸線方向に穿設された孔に後方から差し込まれて固定されている。
【００１０】
また、照明窓３の後方位置には、先端部本体１に軸線方向に貫通して穿設された孔にライトガイドファイババンドル６が後方から挿通固定されている。なお、イメージガイドファイババンドル５に代えて固体撮像素子を配置したものであってもよい。
【００１１】
先端部本体１の先側半部は後側半部より外径が大きく形成されていて、その外周部分に周方向に形成された溝内には、超音波信号を先端部本体１の軸線周りにラジアル走査するための環状の超音波振動子１１が嵌め込まれて、その超音波振動子１１の外周面にゴム材等からなる環状の音響レンズ１２が密着して装着されている。なお、各部は全て先端部本体１の軸線を中心とする正円形の断面形状に形成されている。
【００１２】
また、超音波振動子１１に入出力される信号を伝送するためのフレキシブル基板１３や、超音波振動子１１を囲むように装着されるバルーン（図示せず）内に脱気水を送排水するための送排水路７等が、後方の湾曲部２０内から先端部本体１内の途中位置まで配置されている。８は、バルーンを固定するための一対の円周溝である。
【００１３】
湾曲部２０は、可撓性挿入部の基端側からの遠隔操作によって屈曲させることができるように可撓性挿入部の先端部分に配置されており、複数（例えば５〜２０個程度）の公知の節輪をリベット等で回転自在に連結して構成されている。
【００１４】
そして、最先端の節輪２１の先端寄りの部分が、先端部本体１の後端部分の外周に被嵌されて図示されていない小ネジ等で先端部本体１に連結固定されている。２２は、湾曲部２０を外装するゴム製の外皮チューブである。
【００１５】
このように構成された実施例のラジアル走査型超音波内視鏡の先端部において、超音波振動子１１の内周面１１ａの直径Ｄ１が、先端部本体１の後端部分（即ち、湾曲部２０に面する部分）の外周面の直径Ｄ２以上の径に形成されている。即ち、Ｄ１≧Ｄ２である。
【００１６】
したがって、湾曲部２０内から先端部本体１の先端面１ａまで内蔵物（イメージガイドファイババンドル５、ライトガイドファイババンドル６等）を通過させるためのスペースが先端部本体１の途中で狭められず、可撓性挿入部の径に対応した十分な量の内蔵物を配置して、十分な光学観察機能を得ることができる。
【００１７】
また、音響レンズ１２の外周面部分が、湾曲部２０も含めて可撓性挿入部の先端部分の最大径になっている。したがって、先端部本体１に必ずしもバルーンを装着しなくても、音響レンズ１２を体腔内の粘膜面に比較的容易に密着させて超音波断層像を得ることができる。
【００１８】
【発明の効果】
本発明によれば、先端部本体の外周部分に環状の超音波振動子が配置されたラジアル走査型超音波内視鏡の先端部において、超音波振動子の内周面を、先端部本体の後端部分の外周面の径以上の径に形成したことにより、先端部本体の後端部分から先端面まで内蔵物を通過させるためのスペースが先端部本体の途中で狭められないので、十分な光学観察機能を得るための内蔵物を先端部本体内に不足なく挿通配置することができる。
【図面の簡単な説明】
【図１】本発明の実施例のラジアル走査型超音波内視鏡の先端部の側面断面図である。
【図２】従来のラジアル走査型超音波内視鏡の先端部の側面部分断面図である。
【符号の説明】
１ 先端部本体
１ａ 先端面
２ 光学観察窓
３ 照明窓
５ イメージガイドファイババンドル（内蔵物）
６ ライトガイドファイババンドル（内蔵物）
７ 送排水路
１１ 超音波振動子
１１ａ 内周面
１２ 音響レンズ
１３ フレキシブル基板
２０ 湾曲部
２１ 最先端の節輪
Ｄ１ 超音波振動子の内周面の直径
Ｄ２ 先端部本体の後端部分の外周面の直径[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distal end portion of a radial scanning ultrasonic endoscope that scans an ultrasonic signal around an axis of a distal end portion of an insertion section.
[0002]
[Prior art]
As shown in FIG. 2, a radial scanning ultrasonic endoscope generally has an optical observation window 2 and an illumination window 3 arranged on a distal end surface 1a of a distal end main body 1 connected to a distal end of an insertion portion. The ultrasonic transducer 11 and the acoustic lens 12 surrounding it are arranged on the outer peripheral portion of the distal end body 1 (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-153469
[0004]
[Problems to be solved by the invention]
However, in the conventional radial scanning ultrasonic endoscope as described above, the inner peripheral surface 11a of the ultrasonic transducer 11 is annularly disposed at a position considerably deeper than the outer periphery of the distal end body 1. Therefore, the space for passing the observation optical member, the illumination member, and other so-called built-in components 50 from the rear to the distal end surface 1a of the distal end body 1 is narrowed, and a sufficient optical observation function cannot be obtained. .
[0005]
Therefore, an object of the present invention is to provide a distal end portion of a radial scanning ultrasonic endoscope in which a built-in component for obtaining a sufficient optical observation function can be inserted and arranged in the distal end portion main body without lack.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the distal end of the radial scanning ultrasonic endoscope of the present invention has an optical observation window arranged on the distal end surface of the distal end main body connected to the distal end of the insertion section, At the distal end of the radial scanning ultrasonic endoscope in which the annular ultrasonic transducer is disposed on the outer peripheral portion, the inner peripheral surface of the ultrasonic transducer is larger than the diameter of the outer peripheral surface of the rear end portion of the distal end body. It is formed into a diameter.
[0007]
When the acoustic lens is arranged around the outer surface of the ultrasonic transducer and the outer peripheral surface of the acoustic lens has the maximum diameter at the distal end of the insertion portion, an ultrasonic tomographic image can be easily formed without a balloon. Obtainable.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows the distal end of a radial scanning ultrasonic endoscope. The distal end surface of the distal end main body 1 connected to the distal end of the flexible insertion portion visually shows the front of the distal end main body 1. An optical observation window 2 and an illumination window 3 for observation are arranged side by side, and in addition, a treatment tool protrusion or the like (not shown) is arranged.
[0009]
At a position behind the optical observation window 2, an objective optical system 4 is provided in the distal end main body 1. An image guide fiber bundle 5 having an image incident end face arranged at a position where the object is projected by the objective optical system 4 is inserted from the rear into a hole formed in the distal end body 1 in the axial direction and fixed. .
[0010]
At the rear position of the illumination window 3, a light guide fiber bundle 6 is inserted and fixed from the rear into a hole penetrating through the distal end body 1 in the axial direction. Note that a solid-state imaging device may be provided instead of the image guide fiber bundle 5.
[0011]
The front half of the tip body 1 has an outer diameter larger than that of the rear half, and an ultrasonic signal is applied around the axis of the tip body 1 in a groove formed in the outer circumferential portion in the circumferential direction. An annular ultrasonic vibrator 11 for radial scanning is fitted into the ultrasonic vibrator 11, and an annular acoustic lens 12 made of a rubber material or the like is closely attached to an outer peripheral surface of the ultrasonic vibrator 11. In addition, each part is formed in a perfect circular cross-sectional shape centering on the axis of the distal end body 1.
[0012]
In addition, deaerated water is sent and drained into a flexible substrate 13 for transmitting signals input to and output from the ultrasonic vibrator 11 and into a balloon (not shown) mounted so as to surround the ultrasonic vibrator 11. Water supply / drainage passage 7 and the like are arranged from the inside of the curved portion 20 at the rear to an intermediate position in the distal end portion main body 1. 8 is a pair of circumferential grooves for fixing the balloon.
[0013]
The bending portion 20 is disposed at the distal end portion of the flexible insertion portion so that the bending portion 20 can be bent by remote operation from the base end side of the flexible insertion portion, and a plurality of (for example, about 5 to 20) bending portions are provided. It is constituted by connecting a known articulation ring by a rivet or the like so as to be rotatable.
[0014]
A portion of the foremost node ring 21 near the front end is fitted on the outer periphery of the rear end portion of the front end portion main body 1 and connected and fixed to the front end main body 1 with a small screw or the like (not shown). Reference numeral 22 denotes a rubber outer tube that covers the curved portion 20.
[0015]
In the distal end portion of the radial scanning type ultrasonic endoscope of the embodiment configured as described above, the diameter D1 of the inner peripheral surface 11a of the ultrasonic transducer 11 is changed to the rear end portion of the distal end main body 1 (that is, the curved portion). 20 (a portion facing 20). That is, D1 ≧ D2.
[0016]
Therefore, the space for passing the built-in object (the image guide fiber bundle 5, the light guide fiber bundle 6, and the like) from the inside of the bending portion 20 to the distal end surface 1a of the distal end main body 1 is not narrowed in the middle of the distal end main body 1. By arranging a sufficient amount of internal components corresponding to the diameter of the flexible insertion portion, a sufficient optical observation function can be obtained.
[0017]
Further, the outer peripheral surface portion of the acoustic lens 12 has the maximum diameter of the distal end portion of the flexible insertion portion including the curved portion 20. Therefore, even if the balloon is not necessarily attached to the distal end main body 1, the acoustic lens 12 can be relatively easily brought into close contact with the mucosal surface in the body cavity to obtain an ultrasonic tomographic image.
[0018]
【The invention's effect】
According to the present invention, in the distal end portion of the radial scanning ultrasonic endoscope in which the annular ultrasonic transducer is disposed on the outer peripheral portion of the distal end body, the inner peripheral surface of the ultrasonic transducer is Since the rear end portion is formed to have a diameter equal to or larger than the diameter of the outer peripheral surface, the space for allowing the built-in to pass from the rear end portion of the distal end portion to the distal end surface is not narrowed in the middle of the distal end portion main body. The built-in object for obtaining the optical observation function can be inserted and arranged in the distal end body without any shortage.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a distal end portion of a radial scanning ultrasonic endoscope according to an embodiment of the present invention.
FIG. 2 is a partial side sectional view of a distal end portion of a conventional radial scanning ultrasonic endoscope.
[Explanation of symbols]
1 tip body 1a tip surface 2 optical observation window 3 illumination window 5 image guide fiber bundle (built-in)
6 Light guide fiber bundle (built-in)
7 Drainage channel 11 Ultrasonic vibrator 11a Inner peripheral surface 12 Acoustic lens 13 Flexible substrate 20 Curved portion 21 State-of-the-art node ring D1 Diameter of inner peripheral surface of ultrasonic transducer D2 Outer peripheral surface of rear end of main body Diameter of

Claims (2)

挿入部の先端に連結された先端部本体の先端面に光学観察窓が配置され、上記先端部本体の外周部分に環状の超音波振動子が配置されたラジアル走査型超音波内視鏡の先端部において、
上記超音波振動子の内周面を、上記先端部本体の後端部分の外周面の径以上の径に形成したことを特徴とするラジアル走査型超音波内視鏡の先端部。The distal end of a radial scanning ultrasonic endoscope in which an optical observation window is disposed on the distal end surface of a distal end main body connected to the distal end of the insertion section, and an annular ultrasonic transducer is disposed on an outer peripheral portion of the distal end main body. In the department,
A distal end portion of the radial scanning ultrasonic endoscope, wherein an inner peripheral surface of the ultrasonic transducer is formed to have a diameter larger than a diameter of an outer peripheral surface of a rear end portion of the distal end body. 上記超音波振動子の外面を囲んで音響レンズが配置されていて、上記音響レンズの外周面部分が上記挿入部の先端部分の最大径になっている請求項１記載のラジアル走査型超音波内視鏡の先端部。2. The radial scanning ultrasonic wave according to claim 1, wherein an acoustic lens is arranged around an outer surface of the ultrasonic transducer, and an outer peripheral surface portion of the acoustic lens has a maximum diameter at a tip portion of the insertion portion. The end of the endoscope.
JP2002328281A 2002-11-12 2002-11-12 The tip of a radial scanning ultrasound endoscope Expired - Fee Related JP4199522B2 (en)

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Application Number Priority Date Filing Date Title
JP2002328281A JP4199522B2 (en) 2002-11-12 2002-11-12 The tip of a radial scanning ultrasound endoscope

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JP4199522B2 JP4199522B2 (en) 2008-12-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006020703A (en) * 2004-07-06 2006-01-26 Fujinon Corp Ultrasonic endoscope
JP2007189508A (en) * 2006-01-13 2007-07-26 Oki Electric Ind Co Ltd Information provision system
WO2018060369A1 (en) * 2016-09-29 2018-04-05 Koninklijke Philips N.V. Flexible imaging assembly for intraluminal imaging and associated devices, systems, and methods

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006020703A (en) * 2004-07-06 2006-01-26 Fujinon Corp Ultrasonic endoscope
JP4618410B2 (en) * 2004-07-06 2011-01-26 富士フイルム株式会社 Ultrasound endoscope
JP2007189508A (en) * 2006-01-13 2007-07-26 Oki Electric Ind Co Ltd Information provision system
JP4548346B2 (en) * 2006-01-13 2010-09-22 沖電気工業株式会社 Information provision system
WO2018060369A1 (en) * 2016-09-29 2018-04-05 Koninklijke Philips N.V. Flexible imaging assembly for intraluminal imaging and associated devices, systems, and methods
US11759174B2 (en) 2016-09-29 2023-09-19 Philips Image Guided Therapy Corporation Flexible imaging assembly for intraluminal imaging and associated devices, systems, and methods

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