JP5972599B2 - Observation field expansion device - Google Patents

Observation field expansion device Download PDF

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JP5972599B2
JP5972599B2 JP2012036711A JP2012036711A JP5972599B2 JP 5972599 B2 JP5972599 B2 JP 5972599B2 JP 2012036711 A JP2012036711 A JP 2012036711A JP 2012036711 A JP2012036711 A JP 2012036711A JP 5972599 B2 JP5972599 B2 JP 5972599B2
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leg
base portion
distal end
pull wire
annular ring
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JP2013169422A (en
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幸 西村
幸 西村
西村　誠
誠 西村
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Kaneka Corp
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本発明は、内視鏡等の医療用器具の先端に取り付けられて処置対象の患部を拡張して内視鏡の観察視野を広げることができる観察視野拡張装置に係り、特に、内視鏡等の径より広い観察視野を安定的に確保し、粘膜等が付着した場合であっても観察視野を確保することができる観察視野拡張装置に関する。   The present invention relates to an observation field expansion device that can be attached to the tip of a medical instrument such as an endoscope to expand an affected area of a treatment target and expand an observation field of the endoscope, and in particular, an endoscope or the like. The present invention relates to an observation visual field expansion device that can stably secure an observation visual field wider than the diameter and secure an observation visual field even when mucous membranes or the like adhere.

一般に内視鏡は、照明用ライト、ＣＣＤカメラレンズ、送気・送水ノズル、鉗子や切開具等の処置具を先端部に向けて貫通させるための複数のチャネルが配置され、体腔内に挿入された状態で、照明用ライトにより照明が当てられた体腔内の部位の画像をＣＣＤカメラレンズによって観察し、処置具による施術を行うように構成されている。   In general, an endoscope has an illumination light, a CCD camera lens, an air / water supply nozzle, a plurality of channels for penetrating treatment tools such as forceps and an incision tool toward the distal end, and is inserted into a body cavity. In this state, the image of the part in the body cavity illuminated by the illumination light is observed with the CCD camera lens, and the treatment with the treatment tool is performed.

この内視鏡は、例えば、胃粘膜層の患部周囲を切開し、該粘膜層の下層に位置する繊維状筋の病巣を切除する施術の場合、前記粘膜層の切開に続いて粘膜層と筋層との間の繊維状筋に切開具を挿入し、ＣＣＤカメラレンズによる患部画像を確認しながら切開具の操作を行うものであるが、切開した粘膜層と繊維状筋との間に挿入した部分の視野が狭いため、患部画像の視野を確保するため又は広げるために粘膜層と繊維状筋との間を拡張する観察視野拡張装置が使用されるのが一般的である。   For example, in the case of an operation in which the periphery of an affected area of the gastric mucosa layer is incised and the lesion of the fibrous muscle located in the lower layer of the mucosa layer is excised, the endoscope is inspected after the incision of the mucosa layer. The incision tool is inserted into the fibrous muscle between the layers and the incision tool is operated while confirming the image of the affected area with the CCD camera lens, but it was inserted between the incised mucosal layer and the fibrous muscle. Since the field of view of the part is narrow, an observation field expansion device that expands between the mucosal layer and the fibrous muscle is generally used to secure or expand the field of view of the affected area.

この従来技術による観察視野拡張装置が記載された文献としては、下記の特許文献が挙げられる。特許文献１には内視鏡の先端に内視鏡外周方向に湾曲する一対のレトラクタ部材を設け、該レトラクタ部材が粘膜層を持ち上げる技術が記載され、特許文献２には内視鏡の先端に方向に延びる透過性のフードを設けることによって内視鏡視野を確保する技術が記載され、特許文献３には内視鏡の先端に把持鉗子を設け、該把持鉗子によって粘膜層を引上げることにより、粘膜膜と繊維状筋間の視野を確保する技術が記載されている。   The following patent documents can be cited as documents describing the observation field expansion device according to the prior art. Patent Document 1 describes a technique in which a pair of retractor members that are curved in the outer circumferential direction of the endoscope are provided at the distal end of the endoscope, and the retractor member lifts the mucosal layer. Patent Document 2 describes the technique at the distal end of the endoscope. A technique for securing an endoscope visual field by providing a permeable hood extending in a direction is described. Patent Document 3 provides gripping forceps at the distal end of an endoscope, and pulls up a mucous membrane layer with the gripping forceps. A technique for ensuring a visual field between the mucosal membrane and the fibrous muscle is described.

特開２００９−２１９７４３号公報JP 2009-219743 A 特開２００３−２０４９１９号公報JP 2003-204919 A 特開２００８−１９４３０２号公報JP 2008-194302 A

前述の特許文献１及び３に記載された技術は、一対のレトラクタ部材又は把持鉗子によって粘膜層を持ち上げることができるものの、これらレトラクタ部材又は把持鉗子を駆動するための駆動力を操作部から供給することが困難であると共に前記レトラクタ部材及び把持鉗子が観察視野を阻害してしまう可能性があるという課題があり、特許文献２に記載された技術は、透明なフードに粘液が付着して観察視野を阻害してしまう可能性がある為、フードの開口範囲しか良い視界が得られないという課題があった。   Although the techniques described in Patent Documents 1 and 3 described above can lift the mucosal layer with a pair of retractor members or gripping forceps, a driving force for driving the retractor members or gripping forceps is supplied from the operation unit. However, the retractor member and the grasping forceps may obstruct the observation visual field, and the technique described in Patent Document 2 is such that mucus adheres to the transparent hood and the observation visual field. There is a problem that a good field of view can be obtained only in the opening range of the hood.

このような課題に鑑みて、本発明は、前述の従来技術による課題を解決しようとするものであり、内視鏡等の長尺状の医療用器具の観察視野を阻害することなく、患部を広げて観察視野を大きく拡張することができる観察視野拡張装置を提供することを目的とする。   In view of such problems, the present invention is intended to solve the above-described problems caused by the prior art, and without affecting the observation field of view of an elongated medical instrument such as an endoscope. An object of the present invention is to provide an observation field expansion device that can be widened to greatly expand the observation field.

前記目的を達成するために本発明は、長尺状の医療用器具の先端に突出して取り付けられ、該医療用器具外周方向に向かって拡張することによって医療用器具からの観察視野を広げることができる観察視野拡張装置であって、前記医療用器具の先端外周に装着する帯筒状のベース部と、該ベース部から前記突出方向に向かって延びる複数の脚部と、該複数の脚部の先端部に設けられた先端環状リングと、前記ベース部側から延びて前記複数の脚部に設けられた複数の先端環状リングを順に円環状に貫通して端部の先端環状リングに固着された第１のプルワイヤーとを備え、該第１のプルワイヤーを前記長尺状の医療用器具の軸方向に沿って移動させることによって前記複数の脚部の突出方向先端部を前記医療用器具外周方向に向かって開閉するように構成したことを第１の特徴とする。   In order to achieve the above-mentioned object, the present invention extends the viewing field from a medical instrument by projecting and attaching to the distal end of a long medical instrument and expanding toward the outer peripheral direction of the medical instrument. A viewing field expansion device that can be mounted on the outer periphery of the distal end of the medical instrument, a plurality of leg portions extending from the base portion toward the projecting direction, and a plurality of leg portions. A tip annular ring provided at the tip and a plurality of tip annular rings extending from the base portion side and provided at the plurality of legs are sequentially passed through in an annular shape and fixed to the tip annular ring at the end. A plurality of first pull wires, and by moving the first pull wires along the axial direction of the elongated medical instrument, the protruding ends of the plurality of legs are arranged on the outer periphery of the medical instrument. Open and close By being configured such that the first feature.

また、本発明は、長尺状の医療用器具の先端に突出して取り付けられ、該医療用器具外周方向に向かって拡張することによって医療用器具からの観察視野を広げることができる観察視野拡張装置であって、前記医療用器具の先端外周に装着する帯筒状のベース部と、該ベース部から前記突出方向に向かって延びる複数の脚部と、該複数の脚部の先端部に設けられた先端環状リングと、前記ベース部から前記突出方向に向かって複数の脚部に順に設けられた脚部環状リングと、前記ベース部側から延びて前記複数の脚部に設けられた脚部環状リングを順に螺旋状に貫通し、前記複数の先端環状リングを順に円環状に貫通して端部の先端環状リングに固着された第１のプルワイヤーとを備え、該第１のプルワイヤーを前記長尺状の医療用器具の軸方向に沿って移動させることによって前記複数の脚部の突出方向先端部を前記医療用器具外周方向に向かって開閉するように構成したことを第２の特徴とする。   The present invention also provides an observation visual field expansion device that is attached to projecting from the distal end of a long medical instrument and can expand the observation visual field from the medical instrument by expanding toward the outer peripheral direction of the medical instrument. A strip-shaped base portion attached to the outer periphery of the distal end of the medical device, a plurality of leg portions extending from the base portion toward the protruding direction, and a distal end portion of the plurality of leg portions. A leading end annular ring, a leg annular ring provided in order on a plurality of legs from the base part toward the protruding direction, and a leg annular provided on the plurality of legs extending from the base part side A first pull wire that passes through the ring in a spiral manner, passes through the plurality of tip annular rings in an annular shape, and is fixed to the tip end annular ring, and the first pull wire is Long medical instrument shaft By being configured to open and close toward the protruding direction leading end portion of the plurality of legs to the medical instrument circumferentially by moving along the direction to the second feature.

更に本発明は、前記第１又は第２の特徴の観察視野拡張装置において、前記第１のプルワイヤーが前記ベース部側から延びる位置と円環対象の位置から延びる第２のプルワイヤーを設け、前記第１のプルワイヤー及び第２のプルワイヤーが前記先端環状リングを円環状に貫通するように構成したことを第３の特徴とし、前記第１から第３何れかの特徴の観察視野拡張装置において、前記複数の脚部が、ベース部から前記突出方向に向かって剛性が低下するように構成したことを第４の特徴とし、前記第４の特徴の観察視野拡張装置において、前記複数の脚部が、ベース部から前記突出方向に向かって段階的に幅を狭くすることによって前記剛性が低下するように構成したことを第５の特徴とし、前記第４の特徴の観察視野拡張装置において、前記複数の脚部が、ベース部から前記突出方向に向かって直線的に幅を狭くすることによって前記剛性が低下するように構成したことを第６の特徴とする。   Furthermore, the present invention provides the observation field expanding device according to the first or second feature, wherein the first pull wire extends from the base portion side and the second pull wire extends from the position of the annular object, The observation field extending device according to any one of the first to third features, wherein the first pull wire and the second pull wire are configured to pass through the tip annular ring in an annular shape. In the fourth aspect of the present invention, the plurality of legs are configured such that rigidity decreases from a base portion in the projecting direction. In the observation field expansion device according to the fourth feature, the plurality of legs The fifth feature is that the rigidity is reduced by narrowing the width stepwise from the base portion toward the protruding direction, and in the observation field expansion device of the fourth feature, Serial plurality of legs, the rigid by narrowing the linearly width toward the base portion in the protruding direction is the sixth aspect of the which is configured to decrease.

本発明による観察視野拡張装置は、プルワイヤーを長尺状の医療用器具の軸方向に沿って移動させることによって前記複数の脚部の突出方向先端部を医療用器具外周方向に向かって開閉するように構成したことによって、観察視野を阻害することなく患部を広げて観察視野を拡張することができる。   The observation visual field expansion device according to the present invention opens and closes the distal ends in the protruding direction of the plurality of legs toward the outer peripheral direction of the medical instrument by moving the pull wire along the axial direction of the elongated medical instrument. With this configuration, it is possible to expand the observation field by expanding the affected area without obstructing the observation field.

本発明の第１実施形態による観察視野拡張装置を説明するための図。The figure for demonstrating the observation visual field expansion apparatus by 1st Embodiment of this invention. 本第１実施形態による観察視野拡張装置の展開状態を示す図。The figure which shows the expansion | deployment state of the observation visual field expansion apparatus by this 1st Embodiment. 本実施形態による観察視野拡張装置を装着した内視鏡操作を説明するための図。The figure for demonstrating the endoscope operation | movement which mounted | wore the observation visual field expansion apparatus by this embodiment. 本実施形態による観察視野拡張装置を装着した内視鏡操作を説明するための詳細図。Detailed drawing for demonstrating the endoscope operation | movement which mounted | wore the observation visual field expansion apparatus by this embodiment. 本発明の第２実施形態による観察視野拡張装置を説明するための図。The figure for demonstrating the observation visual field expansion apparatus by 2nd Embodiment of this invention. 本第２実施形態による観察視野拡張装置の展開状態を示す図。The figure which shows the expansion | deployment state of the observation visual field expansion apparatus by this 2nd Embodiment. 本発明の第３実施形態による観察視野拡張装置を説明するための図。The figure for demonstrating the observation visual field expansion apparatus by 3rd Embodiment of this invention. 本発明による観察視野拡張装置の他の使用例を説明するための図。The figure for demonstrating the other usage example of the observation visual field expansion apparatus by this invention.

以下、本発明による観察視野拡張装置の複数の実施形態を図面を参照して詳細に説明する。
［前提説明］
まず、本発明による観察視野拡張装置７０を装着した内視鏡１００の使用形態を図３及び図４を参照して説明する。
本発明による観察視野拡張装置７０は、例えば、図３に示すように、人体の体腔内に挿入されたオーバーチューブ１０１によって胃内の患部に導入された内視鏡１００の先端に装着され、開閉操作部１１０を操作することによって先端側が開閉するように構成されており、図４に示すように、内視鏡１００のＣＣＤカメラレンズによる患部画像を確認しながら、胃内壁の粘膜層２と筋層３との間の繊維状筋４を切開具９により切開して粘膜層２を剥離する際に、切開した粘膜層２と筋層３間を押し広げて観察視野を確保するためのものである。 Hereinafter, a plurality of embodiments of an observation field expansion device according to the present invention will be described in detail with reference to the drawings.
[Assumptions]
First, the usage form of the endoscope 100 equipped with the observation visual field expansion device 70 according to the present invention will be described with reference to FIGS.
An observation visual field expansion device 70 according to the present invention is attached to the distal end of an endoscope 100 introduced into an affected area in the stomach by an overtube 101 inserted into a body cavity of a human body, for example, as shown in FIG. The distal end side is configured to be opened and closed by operating the operation unit 110. As shown in FIG. 4, while confirming an image of the affected area by the CCD camera lens of the endoscope 100, the mucosal layer 2 and muscles on the inner wall of the stomach When the fibrous muscle 4 between the layers 3 is incised by the incision tool 9 and the mucosal layer 2 is peeled off, the area between the incised mucosal layer 2 and the muscle layer 3 is expanded to secure an observation visual field. is there.

［第１実施形態］
本発明の第１実施形態による観察視野拡張装置７０は、展開状態においては、図２に示すように、内視鏡１００の外周に嵌合する長辺の帯状のベース部７１と、該ベース部７１から内視鏡先端方向に向かって延びる同一幅Ｌの複数の脚部７２Ａ〜７２Ｈと、該複数の脚部７２Ａ〜７２Ｈのベース部側から内視鏡先端側に向かって取り付け位置が段階的に異なるように脚部７２Ａの根元近傍から脚部７２Ｈ先端側に向かって配置された脚部環状リングａ〜ｈと、前記複数の脚部７２Ａ〜７２Ｈの先端部に取り付けられた先端環状リング７３ａ〜７３ｈと、前記脚部７２Ａの脚部環状リングａから脚部７２Ｈの脚部環状リングｈまでを貫通し、脚部７２Ａの先端環状リング７３ａから脚部７２Ｈの先端環状リング７３ｈまで達するように貫通するプルワイヤー７６と、該プルワイヤー７６を内視鏡１００の外周長手方向に沿って内視鏡操作部側に案内するためのガイド管７５（図１参照）とを備え、組み立て状態においては、図１（ａ）（ｂ）に示すように、長辺の帯状のベース部７１を円環状に巻成し、前記ガイド管７５から延びるプルワイヤー７６が、前記複数の脚部７２Ａ〜７２Ｈの脚部環状リングａ〜ｈを螺旋状に貫通し、前記脚部７２Ａの先端環状リング７３ａから脚部７２Ｈの先端環状リング７３ｈまで円環状に貫通し、先端が脚部７２Ｈの先端環状リング７３ｈに固着するように構成されている。 [First Embodiment]
As shown in FIG. 2, the observation visual field expansion device 70 according to the first embodiment of the present invention has a long-side band-like base portion 71 fitted to the outer periphery of the endoscope 100 and the base portion, as shown in FIG. The plurality of leg portions 72A to 72H having the same width L extending from 71 to the endoscope distal end direction, and the attachment positions are stepwise from the base portion side to the endoscope distal end side of the plurality of leg portions 72A to 72H. Are different from the base of the leg portion 72A toward the distal end side of the leg portion 72H, and the annular annular rings 73a attached to the distal end portions of the plurality of leg portions 72A to 72H. Through the leg annular ring a of the leg 72A to the leg annular ring h of the leg 72H and reach from the distal annular ring 73a of the leg 72A to the distal annular ring 73h of the leg 72H. Penetrate 1 and a guide tube 75 (see FIG. 1) for guiding the pull wire 76 to the endoscope operation section side along the outer peripheral longitudinal direction of the endoscope 100. FIG. (A) As shown in (b), a long-side strip-like base portion 71 is wound in an annular shape, and a pull wire 76 extending from the guide tube 75 is formed in the leg-shaped annular portions of the plurality of leg portions 72A to 72H. Rings a to h are spirally penetrated and penetrated annularly from the tip annular ring 73a of the leg 72A to the tip annular ring 73h of the leg 72H so that the tip is fixed to the tip annular ring 73h of the leg 72H. It is configured.

本実施形態によるベース部７１・複数の脚部７２Ａ〜７２Ｈ・脚部環状リングａ〜ｈ・先端環状リング７３ａ〜７３ｈは、剛性及び弾性復元力を有する金属製であり、ベース部７１及び複数の脚部７２Ａ〜７２Ｈは、厚さが同一であり、脚部環状リングａ〜ｈ及び先端環状リング７３ａ〜７３ｈは、複数の脚部７２Ａ〜７２Ｈにロー付け又は溶接されている。なお、脚部環状リングａ〜ｈ及び先端環状リング７３ａ〜７３ｈは、体内で各リングの出っ張りが粘膜に引っかからないように、組み立て後に脚部７２Ａ〜７２Ｈの内側に向くように取り付けられることが望ましい。また、ガイド管７５は、ＰＴＦＥやナイロンなどの固めのチューブ或いは金属製コイルを巻成した密着巻きコイルから成り、内視鏡の外周部に粘着テープによって着脱自在に取り付けられる。なお、ガイド管７５は、ピークや炭素繊維等の剛性及び弾性復元力を有する素材から構成してもよい。   The base portion 71, the plurality of leg portions 72A to 72H, the leg annular rings a to h, and the tip annular rings 73a to 73h according to the present embodiment are made of metal having rigidity and elastic restoring force. The legs 72A to 72H have the same thickness, and the leg annular rings a to h and the tip annular rings 73a to 73h are brazed or welded to the plurality of legs 72A to 72H. Note that the leg annular rings a to h and the tip annular rings 73a to 73h are preferably attached so as to face the inner sides of the legs 72A to 72H after assembly so that the protrusion of each ring does not get caught in the mucous membrane in the body. . The guide tube 75 is made of a tight tube such as PTFE or nylon or a tightly wound coil formed by winding a metal coil, and is detachably attached to the outer peripheral portion of the endoscope with an adhesive tape. The guide tube 75 may be made of a material having rigidity and elastic restoring force such as a peak and carbon fiber.

このように構成された観察視野拡張装置７０は、図３及び図４に示すように内視鏡１００の先端部に嵌合され、図１（ｂ）に示した先端側を閉じた状態から図１（ａ）の矢印イ方向にプルワイヤー７６を押圧したとき、前記プルワイヤー７６が脚部７２Ａ〜７２Ｈに螺旋状に取り付けられた脚部環状リングａ〜ｈ及び先端環状リング７３ａ〜７３ｇを通して先端環状リング７３ｈが固着された脚部７２Ｈを円周方向に押し出すことによって、図１（ａ）に示すように、先端側を旋回しながら広げるように動作することができ、逆に、プルワイヤー７６を図１（ｂ）の矢印ロ方向に引いたとき、プルワイヤー７６が脚部７２Ａ〜７２Ｈに螺旋状に取り付けられた脚部環状リングａ〜ｈ及び先端環状リング７３ａ〜７３ｇを通して先端環状リング７３ｈが固着された脚部７２Ｈを円周方向に引き戻して縮径することによって、先端側が閉じるように動作することができる。
なお、図３に示すようにオーバーチューブを用いる場合は、オーバーチューブ内を移動し易いように先端側を図よりも更に窄めることができるように構成してもよい。 The observation visual field expansion device 70 configured as described above is fitted into the distal end portion of the endoscope 100 as shown in FIGS. 3 and 4, and is viewed from the state where the distal end side shown in FIG. 1 (b) is closed. When the pull wire 76 is pressed in the direction indicated by the arrow 1a in FIG. 1A, the pull wire 76 is inserted through the leg annular rings a to h and the tip annular rings 73a to 73g that are spirally attached to the legs 72A to 72H. By extruding the leg portion 72H to which the annular ring 73h is fixed in the circumferential direction, as shown in FIG. Is pulled in the direction of the arrow B in FIG. 1 (b), the pull ring 76 is spirally attached to the legs 72A to 72H through the leg annular rings a to h and the tip annular rings 73a to 73g. 3h by the reduced in diameter retraction the anchored leg 72H circumferential direction, it is possible to operate so that the tip end is closed.
In addition, when using an overtube as shown in FIG. 3, you may comprise so that the front end side can be narrowed further than a figure so that it may move easily in an overtube.

すなわち、本実施形態による観察視野拡張装置７０は、円環状に巻成したベース部７１から内視鏡先端側に向かって延びる脚部７２Ａの根元近傍から脚部７２Ｈの先端近傍に向かって取り付けられた脚部環状リングａ〜ｈ及び脚部７２Ａ〜７２Ｈの先端に取り付けた先端環状リング７３ａ〜７３ｈを貫通するプルワイヤー７６を設け、該プルワイヤー７６を脚部７２Ａ〜脚部７２Ｈの脚部環状リングａ〜ｈに螺旋状に貫通させ且つ先端環状リング７３ａ〜７３ｈに円環状に貫通させて、プルワイヤー７６を先端環状リング７３ｈに固着し、プルワイヤー７６を押し引きすることよって、複数の脚部７２Ａ〜脚部７２Ｈの先端側を開閉することができる。   That is, the observation visual field expansion device 70 according to the present embodiment is attached from the base portion 71A extending from the annular base portion 71 toward the distal end side of the endoscope toward the vicinity of the distal end of the leg portion 72H. A pull wire 76 that penetrates the end annular rings a to h and the end annular rings 73a to 73h attached to the ends of the legs 72A to 72H is provided, and the pull wire 76 is formed in the leg portions of the legs 72A to 72H. A plurality of legs are formed by penetrating the rings a to h spirally and penetrating the tip annular rings 73 a to 73 h in an annular shape, fixing the pull wire 76 to the tip annular ring 73 h and pushing and pulling the pull wire 76. The front end sides of the portions 72A to 72H can be opened and closed.

このように構成した観察視野拡張装置７０は、図１（ｂ）に図示したように先端側を閉じた状態で内視鏡１００の先端部に装着され、開閉操作部１１０を操作することによって先端側を開閉することができ、図４に示したように、粘膜層２と筋層３との間に挿入した状態で先端側を開くことによって、切開した粘膜層２と筋層３との間を機械的に押し広げて観察視野を広く確保することができ、特に線状の脚部７２Ａ〜脚部７２Ｈ及びプルワイヤー７６によって押し広げることにより、少ない力で操作することができ、患部からの粘液等が付着したとしても観察視野を確保することができる。特に本実施形態においては、プルワイヤー７６を線状の脚部７２Ａ〜脚部７２Ｈを介して螺旋状に先端側に導くように構成したことによって、螺旋状のプルワイヤー７６が複数の脚部７２Ａ〜脚部７２Ｈの外周面に開く力が作用し、粘膜層２と筋層３との間を少ない力で押し広げることができ、粘膜に押されてつぶされることもない。
また、本実施形態による観察視野拡張装置７０は、弾性復元力がある金属製の複数の脚により構成したことによって、粘膜層２と筋層３との間を安定的に拡張することができ、処置部分を広げることができる。
さらに、観察視野拡張装置７０は、上述したように先端側を閉じることができるため、オーバーチューブを用いない場合であっても、食道や大腸といった狭い管腔内に安全に挿入することができる。 The observation field expanding device 70 configured as described above is attached to the distal end portion of the endoscope 100 with the distal end side closed as illustrated in FIG. 1B, and the distal end is operated by operating the opening / closing operation unit 110. The side can be opened and closed, and as shown in FIG. 4, by opening the distal end side in a state of being inserted between the mucosa layer 2 and the muscle layer 3, the incision between the mucosa layer 2 and the muscle layer 3 is incised. Can be widened mechanically to ensure a wide observation field of view, and can be operated with a small force, especially by extending with the linear leg portions 72A to 72H and the pull wire 76, and from the affected area. Even if mucus or the like adheres, an observation visual field can be secured. In particular, in the present embodiment, the pull wire 76 is configured to be guided to the distal end side spirally via the linear leg portions 72A to 72H, so that the spiral pull wire 76 has a plurality of leg portions 72A. -The force which opens to the outer peripheral surface of the leg part 72H acts, and it can push and spread between the mucous membrane layer 2 and the muscular layer 3 with little force, and it is not pushed and crushed by the mucous membrane.
In addition, the observation visual field expansion device 70 according to the present embodiment can be stably expanded between the mucosa layer 2 and the muscle layer 3 by being configured by a plurality of metal legs having elastic restoring force, The treatment part can be expanded.
Furthermore, since the observation visual field expansion device 70 can close the distal end side as described above, it can be safely inserted into a narrow lumen such as the esophagus or the large intestine even when the overtube is not used.

［第２実施形態］
次に本発明の第２の実施形態による観察視野拡張装置を図５及び図６を参照して説明する。この第２実施形態による観察視野拡張装置は、展開状態においては、図６に示すように、内視鏡１００の外周に嵌合する長辺の帯状のベース部７１と、該ベース部７１から内視鏡先端方向に向かって延び、且つ幅が根元側から先端側に向かって長さ寸法Ｌ４、Ｌ５、Ｌ６において幅Ｌ１＞Ｌ２＞Ｌ３のように段階的に細くなる複数の脚部７２Ａ〜７２Ｈと、該複数の脚部７２Ａ〜７２Ｈのベース部側から内視鏡先端側に向かって取り付け位置が段階的に異なるように脚部７２Ａの根元近傍から脚部７２Ｈ先端側に向かって配置された脚部環状リングａ〜ｈと、前記複数の脚部７２Ａ〜７２Ｈの先端部に取り付けられた先端環状リング７３ａ〜７３ｈと、前記脚部７２Ａの脚部環状リングａから脚部７２Ｈの環状リングｈを貫通し、脚部７２Ａの先端環状リング７３ａから脚部７２Ｈの先端環状リング７３ｈを介して先端環状リング７３ｈまで戻るように貫通するプルワイヤー７６と、該プルワイヤー７６を内視鏡１００の外周長手方向に沿って内視鏡操作部側に案内するためのガイド管７５とを備え、組み立て状態においては、図５に示すように、長辺の帯状のベース部７１を円環状に巻成し、前記ガイド管７５から延びるプルワイヤー７６が、前記複数の脚部７２Ａ〜７２Ｈの脚部環状リングａ〜ｈを螺旋状に貫通し、前記脚部７２Ａの先端環状リング７３ａから脚部７２Ｈの先端環状リング７３ｈまで円環状に貫通し、先端環状リング７３ｈに固着するように構成されている。 [Second Embodiment]
Next, an observation visual field expansion apparatus according to a second embodiment of the present invention will be described with reference to FIGS. In the unfolded state, the observation field expanding device according to the second embodiment has a long side belt-like base portion 71 fitted to the outer periphery of the endoscope 100 and an inner portion from the base portion 71 as shown in FIG. A plurality of legs 72A to 72H that extend in the direction of the distal end of the endoscope and whose width gradually decreases from the root side toward the distal end side in the length dimensions L4, L5, and L6 such that the widths L1>L2> L3. The leg portions 72A to 72H are arranged from the base of the leg portion 72A toward the distal end side of the leg portion 72H so that the mounting positions are gradually changed from the base portion side toward the distal end side of the endoscope. Leg annular rings a to h, tip annular rings 73a to 73h attached to the distal ends of the plurality of legs 72A to 72H, and an annular ring h from the leg annular ring a to the leg 72H of the leg 72A. Through the leg 72A A pull wire 76 penetrating from the distal annular ring 73a through the distal annular ring 73h of the leg 72H to the distal annular ring 73h, and the endoscope through the pull wire 76 along the outer peripheral longitudinal direction of the endoscope 100 And a guide tube 75 for guiding to the operating portion side. In the assembled state, as shown in FIG. 5, a long-side belt-like base portion 71 is wound in an annular shape and extends from the guide tube 75. A wire 76 spirally penetrates the leg annular rings a to h of the plurality of leg portions 72A to 72H, and penetrates from the distal annular ring 73a of the leg 72A to the distal annular ring 73h of the leg 72H in an annular shape. And it is configured to be fixed to the tip annular ring 73h.

このように構成された観察視野拡張装置は、前述の第１実施形態同様に、先端側を閉じた状態からプルワイヤー７６を先端側に押圧したとき、前記プルワイヤー７６が脚部７２Ａ〜７２Ｈに螺旋状に取り付けられた脚部環状リングａ〜ｈ及び先端環状リング７３ａ〜７３ｇを通して先端環状リング７３ｈが固着された脚部７２Ｈを押し広げることによって、図５に示すように、先端側を旋回しながら広げるように動作することができ、逆に、プルワイヤー７６を引いたとき、プルワイヤー７６が脚部７２Ａ〜７２Ｈに螺旋状に取り付けられた脚部環状リングａ〜ｈ及び先端環状リング７３ａ〜７３ｇを通して先端環状リング７３ｈが固着された脚部７２Ｈを円周方向に引き戻して縮径することによって、先端側が閉じるように動作することができる。 In the observation field expanding apparatus configured as described above, when the pull wire 76 is pressed toward the distal end side from a state where the distal end side is closed, the pull wire 76 is moved to the leg portions 72A to 72H as in the first embodiment. As shown in FIG. 5, the front end side is swung by spreading the leg portion 72H to which the front end annular ring 73h is fixed through the leg end annular rings a to h and the front end annular rings 73a to 73g attached spirally. can operate to spread while, conversely, when the minus pull wire 76, the pull wire 76 the leg 72A~72H legs annular attached helically ring a~h and distal annular ring 73a~ The leg 72H to which the annular ring 73h is fixed through 73g is pulled back in the circumferential direction to reduce the diameter so that the distal end is closed. Kill.

特に第２実施形態による観察視野拡張装置は、複数の脚部７２Ａ〜７２Ｈの幅を根元側から先端側に向かって寸法Ｌ１、Ｌ２、Ｌ３のように段階的に細くなるように構成したことによって、根元側に比べて先端側の剛性が低く曲がりやすいため、内視鏡の先端から遠い先端側をより開かせる事が出来ると共に、少ない押力又は引力によって先端側を開閉動作させることができ、内視鏡の先端からやや遠い観察視野の確保や、大きな腫瘍等の処置の場合などに好適である。なお、前記長さ方向の寸法は、Ｌ４＝Ｌ５＝Ｌ６×２が好適である。 In particular, the observation field expansion device according to the second embodiment is configured such that the widths of the plurality of leg portions 72A to 72H are gradually reduced from the base side to the tip side as the dimensions L1, L2, and L3. , Because the rigidity on the tip side is low and easy to bend compared to the root side, the tip side far from the tip of the endoscope can be opened more, and the tip side can be opened and closed with less pressing force or attractive force, It is suitable for securing an observation visual field slightly far from the distal end of the endoscope or for treating a large tumor or the like. The dimension in the length direction is preferably L4 = L5 = L6 × 2.

また、本第２実施形態においては、複数の脚部７２Ａ〜７２Ｈの幅を根元側から先端側に向かって段階的に細くなるように構成する例を説明したが、本発明はこれに限られるものではなく、例えば、複数の脚部７２Ａ〜７２Ｈの幅を根元側から先端側に向かって直線的に細く構成することや、同一幅で有っても根元側から先端側に向かって厚みを薄く構成することによって、複数の脚部７２Ａ〜７２Ｈの先端側の剛性を根元側に比べて低くしても良い。 Further, in the second embodiment, the example in which the width of the plurality of leg portions 72A to 72H is configured to be gradually reduced from the root side toward the tip end side has been described, but the present invention is limited to this. For example, the width of the plurality of leg portions 72A to 72H is linearly narrowed from the root side to the tip side, or the thickness is increased from the root side to the tip side even if the width is the same. By making it thin, the rigidity on the tip side of the plurality of leg portions 72A to 72H may be made lower than that on the root side.

［第３実施形態］
前記実施形態においては、複数の脚部７２Ａ〜７２Ｈに１本のプルワイヤー７６が螺旋状に旋回するように取り付ける例を説明したが、本発明はこれに限られるものではなく、２本のプルワイヤーを用いて開閉するように構成しても良く、例えば、図７に示すように、帯状のベース部７１を巻成したときに円周方向に対して向かい合う位置にプルワイヤー７６ａを貫通させるガイド管７５ａにプルワイヤー７６ｂを貫通させるガイド管７５ｂを追加し、脚部７２Ａ〜７２Ｈの先端部に先端環状リング７８ａ〜７８ｈ並びに脚部７２Ａ〜７２Ｈの途中に脚部環状リングｉ〜ｐを追加しておき、前記プルワイヤー７６ａを、ガイド管７５ａから脚部７２Ａの脚部環状リングａと脚部７２Ｂの脚部環状リングｂと脚部７２Ｃの脚部環状リングｃと脚部７２Ｄの脚部環状リングｄと脚部７２Ｅの脚部環状リングｅと脚部７２Ｆの脚部環状リングｆと脚部７２Ｇの脚部環状リングｇとを介して脚部７２Ｈの脚部環状リングｈまで螺旋状に旋回させてから脚部７２Ａ〜７２Ｈ先端の先端環状リング７３ａ〜７３ｈを円環状に旋回させると共に、前記プルワイヤー７６ｂを、ガイド管７５ｂから、脚部７２Ｅの脚部環状リングｉと脚部７２Ｆの脚部環状リングｊと脚部７２Ｇの脚部環状リングｋと脚部７２Ｈの脚部環状リングｌと脚部７２Ａの脚部環状リングｍと脚部７２Ｂの脚部環状リングｎと脚部７２Ｃの脚部環状リングｏと脚部７２Ｄの脚部環状リングｐとを介して脚部７２Ｅの先端環状リング７８ｅまで、螺旋状に旋回させてから脚部７２Ａ〜７２Ｈの先端の先端環状リング７８ｆ、７８ｇ、７８ｈ、７８ａ、７８ｂ、７８ｃ、７８ｄまで円環状に旋回させることによって、２本のプルワイヤーによって観察視野拡張装置の先端側を開閉するようにしても良い。 [Third Embodiment]
In the above-described embodiment, the example in which the single pull wire 76 is attached to the plurality of leg portions 72A to 72H so as to turn spirally has been described, but the present invention is not limited to this, and the two pull wires 76A to 72H are attached. For example, as shown in FIG. 7, a guide that allows the pull wire 76 a to pass through to a position facing the circumferential direction when the band-shaped base portion 71 is wound as shown in FIG. 7. A guide tube 75b that allows the pull wire 76b to pass through the tube 75a is added, and a tip annular ring 78a to 78h and a leg annular ring ip to the middle of the legs 72A to 72H are added to the distal ends of the legs 72A to 72H. The pull wire 76a is connected to the leg annular ring a of the leg 72A, the leg annular ring b of the leg 72B, the leg annular ring c of the leg 72C and the leg from the guide tube 75a. The leg annular ring h of the leg 72H via the leg annular ring d of 72D, the leg annular ring e of the leg 72E, the leg annular ring f of the leg 72F, and the leg annular ring g of the leg 72G And then the tip annular rings 73a to 73h at the tips of the legs 72A to 72H are annularly turned and the pull wire 76b is connected to the leg annular ring i of the leg 72E from the guide tube 75b. Leg annular ring j of leg 72F, leg annular ring k of leg 72G, leg annular ring 1 of leg 72H, leg annular ring m of leg 72A, leg annular ring n of leg 72B, The distal end ring of the legs 72A to 72H is spirally swung from the annular ring o of the leg 72C to the distal annular ring 78e of the leg 72E via the annular leg ring p of the leg 72D. Ring 78f, 78 , 78h, 78a, 78b, 78c, by pivoting annularly to 78d, may be open and close the front end side of the observation field expansion device by two pull wires.

本実施形態による観察視野拡張装置は、向かい合う位置から同方向に旋回する２本のプルワイヤーによって観察視野拡張装置の先端側を開閉するため、より少ないプルワイヤーの押力又は引力によって先端側を開閉動作させることができると共に、開いた状態における形状保持力を強固にして、粘膜層２と筋層３との間を強く広げることができ、覆いかぶさる粘膜を力強く開くことができる。   The observation visual field expansion device according to the present embodiment opens and closes the distal end side of the observation visual field expansion device by two pull wires rotating in the same direction from opposite positions, so that the distal end side is opened and closed by less pull wire pressing force or attraction force. In addition to being able to operate, the shape retention force in the open state can be strengthened, and the space between the mucous membrane layer 2 and the muscle layer 3 can be strongly expanded, and the overlying mucosa can be opened strongly.

本実施形態による観察視野拡張装置は、ベース部７１側から円環対象の位置から延びたプルワイヤー７６ａ及びプルワイヤー７６ｂが、脚部７２Ａ〜７２Ｈの先端部まで螺旋状に配置し、脚部７２Ａ〜７２Ｈの先端部をほぼ二重の円環状に旋回するように配置したことによって、開いた状態における形状保持力を強固にするものであるが、本発明はこれに限られるものではなく、例えば、プルワイヤー７６ａが脚部７２Ａ〜７２Ｄの脚部環状リングを貫通し、プルワイヤー７６ｂが脚部７２Ｅ〜７２Ｈの脚部環状リングを貫通し、両プルワイヤーが７６ａ及び７６ｂを脚部７２Ａ〜７２Ｈの先端部においてほぼ半周状に旋回させることによって、２本のプルワイヤーによる開閉力が均等になるように構成しても良く、２本のプルワイヤーの先端が同じ脚部を重複して押力又は引力が作用するように構成しても良い。   In the observation field expanding device according to the present embodiment, the pull wire 76a and the pull wire 76b extending from the position of the annular object from the base portion 71 side are spirally arranged to the tip portions of the leg portions 72A to 72H, and the leg portion 72A. Although the shape holding force in the opened state is strengthened by arranging the tip portion of ˜72H so as to turn in a substantially double annular shape, the present invention is not limited to this, for example, The pull wire 76a penetrates the leg annular ring of the legs 72A to 72D, the pull wire 76b penetrates the leg annular ring of the legs 72E to 72H, and both the pull wires 76a and 76b pass the legs 72A to 72H. The opening / closing force of the two pull wires may be made equal by turning the tip end of the two pull wires in a substantially semicircular shape. There may also be configured to act the pushing force or attraction duplicate the same leg.

［第４実施形態］
前述の各実施形態においては、プルワイヤーを貫通するガイド管を内視鏡の外周部に粘着テープによって取り付ける例を説明したが、本発明による観察視野拡張装置はこれに限られるものではなく、図８に示すように、オーバーチューブ１０１の先端に観察視野拡張装置を装着し、オーバーチューブ１０１の円環状筒体の枠にワイヤー孔１２０を開口し、開閉操作ノブ２１０から延びるプルワイヤーを該ワイヤー孔１２０に貫通させるように構成しても良い。 [Fourth Embodiment]
In each of the above-described embodiments, the example in which the guide tube penetrating the pull wire is attached to the outer peripheral portion of the endoscope with the adhesive tape has been described. However, the observation field expansion device according to the present invention is not limited to this, As shown in FIG. 8, an observation field expansion device is attached to the tip of the overtube 101, a wire hole 120 is opened in the frame of the annular tube of the overtube 101, and a pull wire extending from the opening / closing operation knob 210 is connected to the wire hole. You may comprise so that it may penetrate to 120.

本実施形態による観察視野拡張装置は、プルワイヤーをオーバーチューブ１０１の円筒状内壁のワイヤー孔１２０を貫通するように構成したことによって、内視鏡１００をオーバーチューブ１０１内に容易に挿入することができる。   In the observation field expanding device according to the present embodiment, the endoscope 100 can be easily inserted into the overtube 101 by configuring the pull wire so as to penetrate the wire hole 120 of the cylindrical inner wall of the overtube 101. it can.

また、本発明による観察視野拡張装置は、臓器内の癒着部分を剥離する処置を行う場合、内視鏡をオーバーチューブに望み観察しながらオーバーチューブを剥離部に押し当てた状態で先端側を拡張して視野を確保し、内視鏡を所望の位置に配して剥離鉗子などの処置具を用いて切開を行うこともでき、特に、臓器の奥に行くほど内視鏡の湾曲操作を駆使しながら施術を行うことができる。すなわち、観察視野拡張装置を内視鏡に直接取り付けた場合と異なり、内視鏡の湾曲と視野拡張装置の移動が連動しないため、内視鏡の湾曲の自由度が上がり、より適切な処置を行うことが可能となる。   In addition, the observation visual field expansion device according to the present invention expands the distal end side in a state where the overtube is pressed against the exfoliation part while observing the endoscope over the overtube when performing a treatment for exfoliating the adhesion part in the organ. The field of view can be secured, and the endoscope can be placed at a desired position and an incision can be made using a treatment tool such as a peeling forceps. The treatment can be performed while In other words, unlike the case where the observation visual field expansion device is directly attached to the endoscope, the bending of the endoscope and the movement of the visual field expansion device are not interlocked. Can be done.

なお、前述の各実施形態においては、プルワイヤーが複数の脚に取り付けられた環状リングの途中を旋回しながら貫通する例を説明したが、本発明はこれに限られるものではなく、プルワイヤーが、複数の脚の途中に配置した脚部環状リングを介することなく（脚部環状リングを設けることなく）、複数の脚の先端に設けた先端環状リングのみを円環状に貫通するように構成しても良く、複数の脚は、本数が８本に限られるものではなく３本以上あれば良い。また、脚幅が第１実施形態のように同一幅として全長が比較的短いものは、内視鏡先端から比較的近くで施術を行うＥＳＤ（内視鏡的粘膜剥離術）に好適であり、第２実施形態の様に先端に向かって狭くして全長が比較的長いものは、大きな腫瘍などの処置に好適である。   In each of the above-described embodiments, the example in which the pull wire penetrates through the middle of the annular ring attached to the plurality of legs has been described, but the present invention is not limited to this, and the pull wire is not limited to this. It is configured so as to penetrate only the tip annular ring provided at the tip of the plurality of legs without passing through the leg annular ring arranged in the middle of the plurality of legs (without providing the leg annular ring). The number of legs is not limited to eight, but may be three or more. In addition, the leg width is the same width as in the first embodiment, and the overall length is relatively short, which is suitable for ESD (endoscopic mucosal dissection) in which surgery is performed relatively close to the distal end of the endoscope, Those that are narrow toward the tip and have a relatively long overall length as in the second embodiment are suitable for treatment of large tumors and the like.

更に、前記実施形態においては主に内視鏡やオーバーチューブの先端部に観察視野拡張装置を装着する例を説明したが、本発明による観察視野拡張装置を装着する対象は内視鏡やオーバーチューブに限られるものではなく、先端側の視野を確保する必要がある長尺状の医療用器具や患部を拡張する必要がある医療用器具に使用することができる。   Furthermore, in the above-described embodiment, the example in which the observation field expansion device is attached mainly to the distal end portion of the endoscope or the overtube has been described. However, the present invention is not limited to this, and can be used for a long medical device that needs to secure a visual field on the distal end side or a medical device that needs to expand an affected part.

ａ〜ｐ 脚部環状リング
７３ａ〜７３ｈ 先端環状リング
７８ａ〜７８ｈ 先端環状リング
７２Ａ〜７２Ｈ 脚部
２ 粘膜層
３ 筋層
４ 繊維状筋
９ 切開具
７０ 観察視野拡張装置
７１ ベース部
７５ ガイド管
７５ａ ガイド管
７５ｂ ガイド管
７６ プルワイヤー
７６ａ プルワイヤー
７６ｂ プルワイヤー
１００ 内視鏡
１０１ オーバーチューブ
１１０ 開閉操作部
a-p leg annular ring 73a-73h distal annular ring 78a-78h distal annular ring 72A-72H leg 2 mucosa layer 3 muscle layer 4 fibrous muscle 9 incision tool 70 observation visual field expansion device 71 base part 75 guide tube 75a guide Tube 75b Guide tube 76 Pull wire 76a Pull wire 76b Pull wire 100 Endoscope 101 Overtube 110 Opening / closing operation unit

Claims (6)

長尺状の医療用器具の先端に突出して取り付けられ、該医療用器具外周方向に向かって拡張することによって医療用器具からの観察視野を広げることができる観察視野拡張装置であって、
前記医療用器具の先端外周に装着する帯筒状のベース部と、該ベース部から前記突出方向に向かって延びる複数の脚部と、該複数の脚部の先端部に設けられた先端環状リングと、前記ベース部側から延びて前記複数の脚部に設けられた複数の先端環状リングを順に円環状に貫通して端部の先端環状リングに固着された第１のプルワイヤーとを備え、該第１のプルワイヤーを前記長尺状の医療用器具の軸方向に沿って移動させることによって前記複数の脚部の突出方向先端部を前記医療用器具外周方向に向かって開閉するように構成したことを特徴とする観察視野拡張装置。 An observation visual field expansion device that is attached to projecting from the distal end of a long medical instrument and can expand the observation visual field from the medical instrument by expanding toward the outer peripheral direction of the medical instrument,
A strip-shaped base portion to be mounted on the outer periphery of the distal end of the medical device, a plurality of leg portions extending from the base portion in the protruding direction, and a distal end annular ring provided at the distal end portions of the plurality of leg portions And a first pull wire that extends from the base portion side and passes through a plurality of tip annular rings provided in the plurality of leg portions in order in an annular shape, and is fixed to the tip end annular ring. The first pull wire is configured to open and close the projecting direction distal ends of the plurality of legs toward the outer peripheral direction of the medical instrument by moving the first pull wire along the axial direction of the elongated medical instrument. An observation field expansion device characterized by that. 長尺状の医療用器具の先端に突出して取り付けられ、該医療用器具外周方向に向かって拡張することによって医療用器具からの観察視野を広げることができる観察視野拡張装置であって、
前記医療用器具の先端外周に装着する帯筒状のベース部と、該ベース部から前記突出方向に向かって延びる複数の脚部と、該複数の脚部の先端部に設けられた先端環状リングと、前記ベース部から前記突出方向に向かって複数の脚部に順に設けられた脚部環状リングと、前記ベース部側から延びて前記複数の脚部に設けられた脚部環状リングを順に螺旋状に貫通し、前記複数の先端環状リングを順に円環状に貫通して端部の先端環状リングに固着された第１のプルワイヤーとを備え、該第１のプルワイヤーを前記長尺状の医療用器具の軸方向に沿って移動させることによって前記複数の脚部の突出方向先端部を前記医療用器具外周方向に向かって開閉するように構成したことを特徴とする観察視野拡張装置。 An observation visual field expansion device that is attached to projecting from the distal end of a long medical instrument and can expand the observation visual field from the medical instrument by expanding toward the outer peripheral direction of the medical instrument,
A strip-shaped base portion to be mounted on the outer periphery of the distal end of the medical device, a plurality of leg portions extending from the base portion in the protruding direction, and a distal end annular ring provided at the distal end portions of the plurality of leg portions And a leg annular ring sequentially provided on a plurality of legs from the base portion toward the projecting direction, and a leg annular ring extending on the base portion side and provided on the plurality of legs in order. And a first pull wire fixedly attached to the end annular ring at the end by passing through the plurality of annular end rings in order to form an annular shape. An observation visual field expansion apparatus configured to open and close the protruding direction front ends of the plurality of legs toward the outer peripheral direction of the medical instrument by moving along the axial direction of the medical instrument. 前記帯筒状のベース部上の位置であって、前記帯筒状のベース部のなす円周上の、当該円の中心をはさんで前記第１のプルワイヤーが前記ベース部側から延びる位置と向かい合う位置から延びる第２のプルワイヤーを設け、前記第１のプルワイヤー及び第２のプルワイヤーが前記先端環状リングを円環状に貫通するように構成したことを特徴とする請求項１又は２記載の観察視野拡張装置。 A position on the band-shaped base portion, the position where the first pull wire extends from the base portion side across the center of the circle on the circumference formed by the band-shaped base portion A second pull wire extending from a position opposite to the first ring wire is provided, and the first pull wire and the second pull wire penetrate the tip annular ring in an annular shape. The observation field expansion device described. 前記複数の脚部が、ベース部から前記突出方向に向かって剛性が低下するように構成したことを特徴とする請求項１から３何れかに記載の観察視野拡張装置。   The observation visual field expansion device according to any one of claims 1 to 3, wherein the plurality of legs are configured such that rigidity decreases from a base portion toward the protruding direction. 前記複数の脚部が、ベース部から前記突出方向に向かって段階的に幅を狭くすることによって前記剛性が低下するように構成したことを特徴とする請求項４記載の観察視野拡張装置。   5. The observation field expanding device according to claim 4, wherein the plurality of legs are configured such that the rigidity is lowered by gradually reducing the width from the base toward the projecting direction. 前記複数の脚部が、ベース部から前記突出方向に向かって直線的に幅を狭くすることによって前記剛性が低下するように構成したことを特徴とする請求項４記載の観察視野拡張装置。   5. The observation field expanding device according to claim 4, wherein the plurality of legs are configured such that the rigidity is reduced by linearly narrowing the width from the base toward the projecting direction.
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