JP2005058431A - Puncturing needle - Google Patents

Puncturing needle Download PDF

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JP2005058431A
JP2005058431A JP2003291772A JP2003291772A JP2005058431A JP 2005058431 A JP2005058431 A JP 2005058431A JP 2003291772 A JP2003291772 A JP 2003291772A JP 2003291772 A JP2003291772 A JP 2003291772A JP 2005058431 A JP2005058431 A JP 2005058431A
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stylet
diameter
diameter portion
flexibility
needle tube
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JP4468664B2 (en
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Naoto Suda
直人 須田
Kenichi Nishina
研一 仁科
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Olympus Corp
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06—Body-piercing guide needles or the like
    • A61M25/065—Guide needles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06—Body-piercing guide needles or the like
    • A61M25/0606—"Over-the-needle" catheter assemblies, e.g. I.V. catheters

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Pulmonology (AREA)
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  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Endoscopes (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a puncturing needle with favorable usability in which flexibility of a channel insertion part is considered so as to smoothly insert into or pull out from a treating tool channel of an endoscope. <P>SOLUTION: The puncturing needle 1 consists of an insertion part 2 and an operation part 3. The insertion part 2 consists of a sheath 11, a cannula 12 and a stylet 13. The stylet 13 is a metal rod such as a stainless steel for example which can be freely inserted into or pulled out from the cannula 12, and is formed with a thick-diameter part 14 and a thin-diameter part 15 which serves as a flexibility adjusting part formed into a thinner diameter than this thick-diameter part 14. Concretely, the tip part of the stylet 13 is constituted of the thick-diameter part 14, and the proximal end side is constituted of the thin-diameter part 15. The flexibility is different between a part where the thick-diameter part 14 of the stylet 13 is inserted and arranged in the insertion part 2 and a part where the thin-diameter part 15 of the stylet 13 is inserted and arranged, and the flexibility at the part where the thin-diameter part 15 is arranged becomes soft. The flexibility is adjusted to a desired condition by properly setting the diameter length of the thin-diameter part 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、経内視鏡的に体腔内に導入される穿刺針に関する。   The present invention relates to a puncture needle introduced endoscopically into a body cavity.

従来より、体腔内患部の検査診断を行うため、超音波内視鏡の超音波画像ガイド下で、胃や十二指腸などの管腔内からリンパ節あるいは膵臓、肝臓、腎臓等の深部臓器の目的部位に穿刺針を穿刺して、体液や細胞組織を採取する手技が行われている。近年では、少しでも多くの細胞組織を採取して検査診断を行えるように穿刺針の太径化が望まれている。   Conventionally, in order to conduct examination diagnosis of affected areas in body cavities, the target site of a deep organ such as a lymph node or pancreas, liver, kidney, etc. from inside a lumen such as the stomach or duodenum under the guidance of an ultrasound image of an ultrasound endoscope A technique has been performed in which a puncture needle is punctured to collect body fluid and cell tissue. In recent years, it has been desired to increase the diameter of the puncture needle so that as much cell tissue as possible can be collected for examination diagnosis.

例えば、特開２００１−２７５９４７号公報には内視鏡の処置具チャンネル入り口に、穿刺針に設けられている穿刺スイッチを使用者の所望する位置にして連結固定可能な内視鏡用穿刺針操作器具が示されている。   For example, Japanese Patent Laid-Open No. 2001-275947 discloses an endoscope puncture needle operation that can be connected and fixed to a treatment instrument channel entrance of an endoscope with a puncture switch provided on the puncture needle at a position desired by the user. The instrument is shown.

図１３（ａ）に示すように前記内視鏡用穿刺針操作器具で使用される穿刺針のチャンネル挿入部（以下、挿入部と略記する）２０１は、内視鏡の処置具チャンネル２００に挿通可能なシース２０２と、このシース２０２内に挿通される針管２０３と、この針管２０３内に挿抜自在なスタイレット２０４とで構成されている。
特開２００１−２７５９４７号公報 As shown in FIG. 13A, a channel insertion portion (hereinafter abbreviated as an insertion portion) 201 of a puncture needle used in the puncture needle operating instrument for endoscope is inserted into the treatment instrument channel 200 of the endoscope. The sheath 202 includes a possible sheath 202, a needle tube 203 inserted into the sheath 202, and a stylet 204 that can be inserted into and removed from the needle tube 203.
JP 2001-275947 A

しかしながら、穿刺針の挿入部を前記図１３（ａ）に示した構成のままで、例えば図１３（ｂ）に示すように可能な範囲で、シース２０２ａ、針管２０３ａ、スタイレット２０４ａを単に太径に形成して、検査の際、少しでも多くの量の細胞組織を採取できる構成にすると、穿刺針の挿入部２０１ａの剛性が上がることによって可撓性が損なわれてしまう。すると、この穿刺針の挿入部２０１ａを、曲がりくねった状態の処置具チャンネル２００内にスムーズに挿通させることが困難になり、挿入力量が増大するとともに、無理に挿入を試みることによって穿刺針或いは処置具チャンネルを破損させるおそれがある。   However, the insertion portion of the puncture needle remains in the configuration shown in FIG. 13A, and the sheath 202a, needle tube 203a, and stylet 204a are simply thickened as far as possible, for example, as shown in FIG. 13B. If the structure is formed so that as much cell tissue as possible can be collected at the time of inspection, the rigidity of the insertion portion 201a of the puncture needle is increased, and the flexibility is impaired. Then, it becomes difficult to smoothly insert the insertion portion 201a of the puncture needle into the tortuous treatment instrument channel 200, the amount of insertion force is increased, and the puncture needle or treatment instrument is attempted by forcibly inserting it. May damage the channel.

加えて、前記挿入部２０１ａの先端部には、前記針管２０３ａ及びスタイレット２０４ａが配置された充実部と、破線で示すように前記針管２０３ａ及びスタイレット２０４ａの配置されていない中空部２０５とが設けられる。このため、径寸法を全体的に太径にした穿刺針の挿入部２０１ａを処置具チャンネル２００内に挿通させる場合、挿通抵抗の増加によって、前記充実部と前記中空部２０５との境界部２０６近傍に応力集中が発生して、シース２０２が折れ曲がるおそれがある。そして、前記シース２０２に折れ曲がりが発生すると、穿刺針のさらなる挿通が困難になる。   In addition, a solid portion where the needle tube 203a and the stylet 204a are arranged and a hollow portion 205 where the needle tube 203a and the stylet 204a are not arranged as shown by a broken line are provided at the distal end of the insertion portion 201a. Provided. For this reason, when the insertion portion 201a of the puncture needle having a large diameter is inserted into the treatment instrument channel 200, the vicinity of the boundary portion 206 between the solid portion and the hollow portion 205 is increased due to an increase in insertion resistance. Stress concentration may occur in the sheath 202, and the sheath 202 may be bent. When the sheath 202 is bent, it becomes difficult to further insert the puncture needle.

本発明は上記事情に鑑みてなされたものであり、内視鏡の処置具チャンネルに対してスムーズな挿抜を行えるように、チャンネル挿入部の可撓性を考慮した、使い勝手に優れた穿刺針を提供することを目的にしている。   The present invention has been made in view of the above circumstances, and a puncture needle excellent in usability is considered in consideration of the flexibility of the channel insertion portion so that smooth insertion and extraction can be performed with respect to the treatment instrument channel of the endoscope. The purpose is to provide.

本発明の穿刺針は、内視鏡の挿入部に設けられた処置具チャンネル内に挿通されるチャンネル挿入部を、前記処置具チャンネルに挿通自在なシースと、このシース内に挿通配置され、観察部位に穿刺される針管と、この針管内に挿抜自在で針管内の生体組織等を管内から除去するスタイレットとで構成する穿刺針であって、
前記スタイレットは、前記チャンネル挿入部の可撓性を調整する可撓性調整部を兼ねている。 In the puncture needle of the present invention, a channel insertion portion that is inserted into a treatment instrument channel provided in an insertion portion of an endoscope, a sheath that can be inserted through the treatment instrument channel, and a sheath that can be inserted into the sheath are arranged and observed. A puncture needle composed of a needle tube that is punctured into a site and a stylet that can be inserted into and removed from the needle tube and that removes biological tissue and the like in the needle tube from the tube;
The stylet also serves as a flexibility adjusting portion that adjusts the flexibility of the channel insertion portion.

そして、前記スタイレットを、前記針管の内周面に対して所定のクリアランスを有する少なくとも先端部を構成する太径部と、この太径部より細径で前記可撓性調整部となる細径部とで構成している。   The stylet has at least a distal end portion having a predetermined clearance with respect to the inner peripheral surface of the needle tube, and a smaller diameter that is smaller than the larger diameter portion and serves as the flexibility adjusting portion. It consists of parts.

この構成によれば、使用目的や処置具チャンネルの径寸法等に合わせて使用するスタイレットを考慮することによって、チャンネル挿入部の可撓性が調整される。   According to this configuration, the flexibility of the channel insertion portion is adjusted by considering the stylet used in accordance with the purpose of use, the diameter of the treatment instrument channel, and the like.

そして、スタイレットを太径部及び細径部とで構成し、それぞれの径寸法や配置位置等を適宜設定することによってスタイレットの可撓性が変化するので、このスタイレットと針管とシースとで構成されるチャンネル挿入部の可撓性が所望の状態に設定されて、生検等をスムーズに行える。   The stylet is composed of a large-diameter portion and a thin-diameter portion, and the flexibility of the stylet is changed by appropriately setting the diameter size, the arrangement position, etc., so this stylet, needle tube, and sheath The flexibility of the channel insertion portion constituted by is set to a desired state, and biopsy and the like can be performed smoothly.

本発明によれば、内視鏡の処置具チャンネルに対してスムーズな挿抜を行えるように、チャンネル挿入部の可撓性を考慮した、使い勝手に優れた穿刺針を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the puncture needle excellent in the use which considered the flexibility of the channel insertion part so that smooth insertion with respect to the treatment tool channel of an endoscope could be performed can be provided.

以下、図面を参照して本発明の実施の形態を説明する。
図１ないし図４は本発明の第１実施形態に係り、図１は穿刺針の構成を説明する図、図２はシース、針管、太径部及び細径部を有するスタイレットを配置して構成されるチャンネル挿入部を説明する断面図、図３は先端部の形状に特徴のあるスタイレットを説明する断面図、図４はスタイレットの他の構成を説明する断面図である。 Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 relate to a first embodiment of the present invention, FIG. 1 is a diagram for explaining the configuration of a puncture needle, and FIG. 2 is a diagram in which a sheath, a needle tube, a stylet having a large diameter portion and a small diameter portion are arranged. FIG. 3 is a cross-sectional view illustrating a stylet that is characterized by the shape of the tip, and FIG. 4 is a cross-sectional view illustrating another configuration of the stylet.

なお、図３（ａ）は太径部の先端部に曲面部を形成したスタイレットを示す図、図３（ｂ）は太径部と細径部とを別部材で形成したスタイレットを示す図、図４（ａ）は樹脂部材で形成した太径部と金属棒で形成した細径部とを有するスタイレットを説明する図、図４（ｂ）は樹脂部材で形成した太径部と細径部とを有するスタイレットを説明する図である。   3A is a diagram showing a stylet in which a curved surface portion is formed at the distal end portion of the large diameter portion, and FIG. 3B is a stylet in which the large diameter portion and the small diameter portion are formed as separate members. FIG. 4A is a diagram for explaining a stylet having a large-diameter portion formed of a resin member and a thin-diameter portion formed of a metal rod, and FIG. 4B is a diagram illustrating a large-diameter portion formed of a resin member. It is a figure explaining a stylet which has a narrow diameter part.

図１及び図２に示すように本実施形態の穿刺針１は、図示しない内視鏡の処置具チャンネルに挿通されるチャンネル挿入部（以下、挿入部と略記する）２と、この挿入部２の基端部に設けられた把持部を兼ねる操作部３とで主に構成されている。   As shown in FIGS. 1 and 2, the puncture needle 1 of the present embodiment includes a channel insertion portion (hereinafter abbreviated as an insertion portion) 2 that is inserted into a treatment instrument channel of an endoscope (not shown), and the insertion portion 2. It is mainly comprised by the operation part 3 which serves as the holding part provided in the base end part.

前記挿入部２は外装を形成するシース１１と、このシース１１内に挿入配置される針管１２と、この針管１２内に挿入配置されるスタイレット１３とで構成される。前記操作部３は、操作部本体２１と摺動部２２とで構成されている。前記摺動部２２は前記操作部本体２１に対して摺動自在に配置される。前記操作部本体２１の先端部には前記シース１１の基端部が固設される。前記摺動部２２の所定位置には前記針管１２の基端部が固設される。   The insertion portion 2 includes a sheath 11 that forms an exterior, a needle tube 12 that is inserted into the sheath 11, and a stylet 13 that is inserted into the needle tube 12. The operation unit 3 includes an operation unit main body 21 and a sliding unit 22. The sliding portion 22 is slidably disposed with respect to the operation portion main body 21. A proximal end portion of the sheath 11 is fixed to a distal end portion of the operation portion main body 21. A proximal end portion of the needle tube 12 is fixed at a predetermined position of the sliding portion 22.

前記シース１１は例えばポリエーテルサルホンやフッ素樹脂などの樹脂チューブである。このシース１１の先端外周面には、生体若しくは処置具チャンネルを形成するチューブ体に傷を付けることを防止する目的で、曲面或いは傾斜面による面取りである面取り部１１ａが設けてある。   The sheath 11 is a resin tube made of, for example, polyethersulfone or fluororesin. A chamfered portion 11a which is a chamfered surface by a curved surface or an inclined surface is provided on the outer peripheral surface of the distal end of the sheath 11 for the purpose of preventing the tube body forming the living body or the treatment instrument channel from being damaged.

前記針管１２は前記摺動部２２の摺動動作に連動して前記シース１１内を進退移動する。この針管１２が前記シース１１の先端面から突出させて観察部位に穿刺することによって、観察部位の体液や生体組織の採取を行える。この針管１２は、外径寸法が例えば１．１ｍｍ程度、内径寸法が例えば０．９ｍｍ程度のステンレスパイプ、或いはニッケルチタンパイプ等の金属パイプで形成されている。この針管１２の先端には鋭利な刃面１２ａが形成されている。   The needle tube 12 moves back and forth in the sheath 11 in conjunction with the sliding operation of the sliding portion 22. When the needle tube 12 protrudes from the distal end surface of the sheath 11 and punctures the observation site, body fluid and biological tissue at the observation site can be collected. The needle tube 12 is formed of a stainless steel pipe having an outer diameter of, for example, about 1.1 mm and an inner diameter of, for example, about 0.9 mm, or a metal pipe such as a nickel titanium pipe. A sharp blade surface 12 a is formed at the tip of the needle tube 12.

前記スタイレット１３は前記針管１２内に挿抜自在であり、前記シース１１及び針管１２とともに挿入部２を構成し、この状態で前記処置具チャンネル内に挿通配置される。前記スタイレット１３は、前記針管１２内に体液や生体組織を採取する際には針管１２内から抜去され、採取した生体組織を針管１２の外部に取り出すときには針管１２内に挿入される。   The stylet 13 can be inserted into and removed from the needle tube 12 and constitutes the insertion portion 2 together with the sheath 11 and the needle tube 12, and in this state, is inserted and disposed in the treatment instrument channel. The stylet 13 is removed from the needle tube 12 when a body fluid or biological tissue is collected in the needle tube 12, and inserted into the needle tube 12 when the collected biological tissue is taken out of the needle tube 12.

本実施形態のスタイレット１３は、前記挿入部２の可撓性を適宜設定する可撓性調整部を兼ねている。このため、このスタイレット１３は、例えばステンレスやニッケルチタンなどの金属棒で形成され、前記針管１２の内周面に対して摺動可能な所定のクリアランスで形成した太径部１４と、この太径部１４より細径に形成した可撓性調整部となる細径部１５とで構成される。   The stylet 13 of the present embodiment also serves as a flexibility adjusting unit that appropriately sets the flexibility of the insertion unit 2. For this reason, the stylet 13 is formed of, for example, a metal rod such as stainless steel or nickel titanium, and has a large-diameter portion 14 formed with a predetermined clearance that is slidable with respect to the inner peripheral surface of the needle tube 12. It is comprised by the thin diameter part 15 used as the flexible adjustment part formed in the diameter smaller than the diameter part 14. FIG.

前記太径部１４は、前記針管１２の内径寸法よりもわずかに細い、例えば０．８ｍｍ〜０．９ｍｍの外径寸法で形成され、前記細径部１５は例えば、０．４ｍｍ〜０．５ｍｍの外径寸法で形成される。   The large-diameter portion 14 is formed with an outer diameter of slightly smaller than the inner diameter of the needle tube 12, for example, 0.8 mm to 0.9 mm, and the thin-diameter portion 15 is, for example, 0.4 mm to 0.5 mm. The outer diameter is formed.

具体的に、本実施形態のスタイレット１３は、先端部を前記太径部１４で構成し、この先端部より基端側を前記細径部１５で構成している。また、前記太径部１４の先端部分に、例えば刃面１３ａを形成している。   Specifically, the stylet 13 of the present embodiment has a distal end portion constituted by the large diameter portion 14 and a proximal end side constituted by the small diameter portion 15 from the distal end portion. Further, for example, a blade surface 13 a is formed at the tip portion of the large-diameter portion 14.

前記スタイレット１３の基端部は着脱部材２３に対して接着若しくは溶着等で一体的に固定される。この着脱部材２３は、前記摺動部２２の基端部に着脱自在に配設される。したがって、前記着脱部材２３を前記摺動部２２の基端部に装着した状態にすることによって、この着脱部材２３は前記摺動部２２と一体的に摺動動作を行う。   The base end portion of the stylet 13 is integrally fixed to the detachable member 23 by adhesion or welding. The detachable member 23 is detachably disposed at the proximal end portion of the sliding portion 22. Therefore, by attaching the detachable member 23 to the base end portion of the sliding portion 22, the detachable member 23 performs a sliding operation integrally with the sliding portion 22.

前記スタイレット１３の長さ寸法は、前記着脱部材２３を前記摺動部２２の基端部に装着した状態にしたとき、このスタイレット１３の先端部が所定量だけ前記針管１２の先端より突出するように設定してある。また、この配置状態のとき、前記針管１２から前記スタイレット１３の細径部１５が露出しないように、前記スタイレット１３の太径部１４の長さ寸法が設定してある。   The length of the stylet 13 is such that the distal end of the stylet 13 protrudes from the distal end of the needle tube 12 by a predetermined amount when the detachable member 23 is attached to the proximal end of the sliding portion 22. It is set to do. Further, in this arrangement state, the length dimension of the large diameter portion 14 of the stylet 13 is set so that the narrow diameter portion 15 of the stylet 13 is not exposed from the needle tube 12.

前記着脱部材２３を前記摺動部２２の基端部に装着した状態で、この摺動部２２を後退させ、前記操作部本体２１に対して最も基端側に配置させとき、前記針管１２の先端より所定量突出したスタイレット１３の先端は図２に示すように前記シース１１の先端から突出しない位置に配置されるようになっている。そして、この配置状態のとき、前記シース１１の先端部には、前記針管１２及び前記スタイレット１３の配置されていない中空部１０が構成される。   When the detachable member 23 is mounted on the proximal end portion of the sliding portion 22, the sliding portion 22 is retracted, and when the detachable member 23 is disposed on the most proximal side with respect to the operation portion main body 21, As shown in FIG. 2, the tip of the stylet 13 that protrudes a predetermined amount from the tip is arranged at a position that does not protrude from the tip of the sheath 11. And in this arrangement | positioning state, in the front-end | tip part of the said sheath 11, the hollow part 10 in which the said needle tube 12 and the said stylet 13 are not arrange | positioned is comprised.

つまり、前記穿刺針１の挿入部２は、外周側から順に、シース１１、針管１２、先端部を形成する太径部１４及びこの太径部１４より基端側を形成する細径部１５を有するスタイレット１３を配置して構成される。この挿入部２では、前記スタイレット１３の太径部１４と細径部１５とが挿通配置されている部位とでは可撓性が変化し、前記細径部１５の配置される部位の可撓性が柔軟になる。そして、前記細径部１５の径寸法を適宜設定することによって、その可撓性が所望の状態に調整される。   That is, the insertion portion 2 of the puncture needle 1 includes a sheath 11, a needle tube 12, a large diameter portion 14 that forms a distal end portion, and a small diameter portion 15 that forms a proximal end side from the large diameter portion 14 in order from the outer peripheral side. The stylet 13 is arranged and configured. In the insertion portion 2, the flexibility changes between the portion where the large diameter portion 14 and the small diameter portion 15 of the stylet 13 are inserted and arranged, and the flexibility of the portion where the small diameter portion 15 is disposed is flexible. Sex is flexible. And the flexibility is adjusted to a desired state by appropriately setting the diameter of the small-diameter portion 15.

つまり、前記スタイレット１３の太径部１４及び細径部１５の外径寸法は上述した寸法に限定されるものではなく、挿入部２の可撓性を所望の状態にして、かつスタイレットとしての作用を得られる範囲であればよい。そのため、細径部１５の外径寸法を設定する際には、太径部１４の外径寸法を基に、その寸法の５０％ないし８５％の範囲にする。   That is, the outer diameter dimensions of the large-diameter portion 14 and the small-diameter portion 15 of the stylet 13 are not limited to the above-described dimensions, but the flexibility of the insertion portion 2 is set to a desired state and is used as a stylet. As long as the effect of the above can be obtained. Therefore, when setting the outer diameter dimension of the small-diameter portion 15, the outer diameter dimension of the large-diameter portion 14 is set in the range of 50% to 85% of the dimension.

このように、穿刺針を構成するチャンネル挿入部を、シース、針管、先端部を形成する太径部及びこの太径部より基端側を形成する細径部を有するスタイレットで構成したことによって、チャンネル挿入部の可撓性をスタイレットの太径部が位置する部分と、スタイレットの細径部が位置する部分とで変化させることができる。   As described above, the channel insertion portion constituting the puncture needle is constituted by a stylet having a sheath, a needle tube, a large diameter portion forming the distal end portion, and a small diameter portion forming the proximal end side from the large diameter portion. The flexibility of the channel insertion portion can be changed between the portion where the large diameter portion of the stylet is located and the portion where the small diameter portion of the stylet is located.

そして、太径部の配置位置や細径部の径寸法等を適宜設定してスタイレットを形成することによって、チャンネル挿入部の可撓性を所望の状態に設定して、湾曲した状態の処置具チャンネルに沿ってスムーズな挿通が可能になるとともに、処置具チャンネルと挿入部との間の挿通抵抗を軽減させることができる。   Then, by appropriately setting the arrangement position of the large diameter portion and the diameter size of the small diameter portion and forming the stylet, the flexibility of the channel insertion portion is set to a desired state, and the treatment of the curved state is performed. Smooth insertion along the instrument channel becomes possible, and insertion resistance between the treatment instrument channel and the insertion portion can be reduced.

また、スタイレットを先端部を形成する太径部とこの太径部より基端側を形成する細径部とで構成したことにより、針管とスタイレットの接触面積が大幅に減少して、スタイレットと針管との摩擦抵抗が軽減されて、スタイレットの挿抜を容易に行うことができる。   In addition, since the stylet is composed of a large-diameter portion that forms the distal end portion and a small-diameter portion that forms the proximal end side from the large-diameter portion, the contact area between the needle tube and the stylet is greatly reduced, and the stylet The friction resistance between the lett and the needle tube is reduced, and the stylet can be easily inserted and removed.

これらのことによって、挿入力量の低減及びシースにかかる負荷の低減を実現して、穿刺手技における操作性が向上することによって、検査時間の短縮や、術者、患者への負担の軽減を図れる。   As a result, the amount of insertion force and the load on the sheath are reduced, and the operability in the puncture technique is improved, so that the examination time can be shortened and the burden on the operator and the patient can be reduced.

なお、図３（ａ）に示すように前記スタイレット１３の先端部に、前記刃面１３ａを形成する代わりに、シース１１を形成するチューブ体等に傷を付けることを防止する目的で曲面又は半球形状等の曲面部１３ｂを設けるようにしてもよい。   As shown in FIG. 3 (a), instead of forming the blade surface 13a at the tip of the stylet 13, a curved surface or the like is used to prevent the tube body or the like forming the sheath 11 from being damaged. A curved surface portion 13b having a hemispherical shape or the like may be provided.

また、スタイレット１３の太径部１４と細径部１５とを一体に構成する代わりに、図３（ｂ）に示すように別部材である中心軸貫通孔１６ａを有する太径部１６と細径部１７とを形成し、この細径部１７の先端部を前記太径部１６に形成されている中心軸貫通孔１６ａに配置させた状態で例えば溶接或いは接着等により、太径部１６と細径部１７とを一体的に固定してスタイレット１３Ａを構成するようにしてもよい。このように、太径部１６と細径部１７とを組み合わせることによって、安価なスタイレット１３Ａが形成される。なお、符号１６ｂは前記中心軸貫通孔１６ａの開口部を塞ぐ接着剤である。   Further, instead of integrally configuring the large diameter portion 14 and the small diameter portion 15 of the stylet 13, as shown in FIG. 3 (b), the large diameter portion 16 having a central shaft through hole 16a, which is a separate member, and the thin diameter portion 16 are formed. The diameter portion 17 is formed, and the distal end portion of the small diameter portion 17 is disposed in the central shaft through hole 16a formed in the large diameter portion 16, for example, by welding or bonding, The stylet 13A may be configured by integrally fixing the small diameter portion 17. Thus, by combining the large diameter portion 16 and the small diameter portion 17, an inexpensive stylet 13A is formed. In addition, the code | symbol 16b is the adhesive agent which plugs up the opening part of the said center axis through-hole 16a.

さらに、図４（ａ）に示すように滑り性の良い例えばフッ素樹脂で太径部１６Ｃを形成する一方、細径部１７を例えばステンレスやニッケルチタンなどの金属棒で形成して、スタイレット１３Ｂを構成するようにしてもよい。前記太径部１６Ｃと前記細径部１７とは、太径部１６Ｃの凹部１６ｄに、細径部１７の先端部を配置させた状態で、例えば接着等によって一体固定する。このことによって、太径部１６Ｃと針管１２との間の摩擦抵抗が大幅に軽減されるので、スタイレット１３Ｂの挿抜性をさらに向上させられる。   Further, as shown in FIG. 4 (a), the large diameter portion 16C is formed of, for example, fluororesin having good slipperiness, while the small diameter portion 17 is formed of, for example, a metal rod such as stainless steel or nickel titanium, and the stylet 13B. You may make it comprise. The large-diameter portion 16C and the small-diameter portion 17 are integrally fixed by, for example, bonding or the like in a state where the tip portion of the small-diameter portion 17 is disposed in the concave portion 16d of the large-diameter portion 16C. As a result, the frictional resistance between the large-diameter portion 16C and the needle tube 12 is greatly reduced, so that the insertability of the stylet 13B can be further improved.

又、図４（ｂ）に示すようにスタイレット１３Ｃを、滑り性の良好な例えばフッ素樹脂製の樹脂棒とし、この樹脂棒に前述と同様な太径部１４と細径部１５とを設けるようにしてもよい。なお、この樹脂棒からなるスタイレット１３Ｃは、予め太径部１４と細径部１５とを有する段付き若しくはテーパー状の樹脂棒として成形によって形成する。   Further, as shown in FIG. 4B, the stylet 13C is made of a resin rod made of, for example, a fluororesin having a good sliding property, and a large diameter portion 14 and a small diameter portion 15 similar to those described above are provided on the resin rod. You may do it. The stylet 13C made of this resin rod is formed by molding as a stepped or tapered resin rod having a large diameter portion 14 and a small diameter portion 15 in advance.

図５及び図６は本発明の変形例にかかり、図５はチャンネル挿入部のシースにかかる応力集中を防止するスタイレットの構成を説明する図、図６はチャンネル挿入部のシースにかかる応力集中を防止するスタイレットの他の構成例を説明する図である。   5 and 6 relate to a modification of the present invention, FIG. 5 is a diagram for explaining the configuration of a stylet that prevents stress concentration on the sheath of the channel insertion portion, and FIG. 6 shows stress concentration on the sheath of the channel insertion portion. It is a figure explaining the other structural example of the stylet which prevents this.

なお、図６（ａ）は樹脂部材で形成した突出太径部と金属棒で形成した細径部とを有するスタイレットを挿通配置したチャンネル挿入部を示す図、図６（ｂ）は突出太径部と細径部とを有する樹脂部材で形成したスタイレットを挿通配置したチャンネル挿入部を示す図である。   6A is a diagram showing a channel insertion portion in which a stylet having a protruding large diameter portion formed of a resin member and a thin diameter portion formed of a metal rod is inserted, and FIG. 6B is a protruding thick portion. It is a figure which shows the channel insertion part which penetrated and arrange | positioned the stylet formed with the resin member which has a diameter part and a small diameter part.

図５に示すように本実施形態の挿入部２は、前記シース１１と、前記針管１２と、スタイレット１３Ｄとで構成される。前記スタイレット１３Ｄは例えばステンレスやニッケルチタンなどの金属棒で形成されている。このスタイレット１３Ｄには、前記針管１２の内周面に対してスムーズに摺動可能な所定のクリアランスで形成した太径部２４と、この太径部２４より細径に形成した挿入部２の可撓性を適宜設定する可撓性調整部となる細径部２５とで構成されている。   As shown in FIG. 5, the insertion part 2 of this embodiment is comprised with the said sheath 11, the said needle tube 12, and the stylet 13D. The stylet 13D is formed of a metal rod such as stainless steel or nickel titanium. The stylet 13D includes a large-diameter portion 24 formed with a predetermined clearance that can smoothly slide with respect to the inner peripheral surface of the needle tube 12, and an insertion portion 2 formed with a diameter smaller than the large-diameter portion 24. It is comprised by the small diameter part 25 used as the flexibility adjustment part which sets flexibility suitably.

具体的に、本実施形態のスタイレット１３Ｄの太径部２４は、前記針管１２の刃面１２ａから突出して、前記中空部１０に配設されるように細長に形成した突出太径部として構成され、この突出太径部２４の基端側に細径部２５が設けられている。   Specifically, the large-diameter portion 24 of the stylet 13D of the present embodiment is configured as a protruding large-diameter portion that protrudes from the blade surface 12a of the needle tube 12 and is elongated so as to be disposed in the hollow portion 10. A small diameter portion 25 is provided on the proximal end side of the protruding large diameter portion 24.

本実施形態のスタイレット１３Ｄの基端部は、前記第１実施形態と同様、前記摺動部２２の基端部に着脱自在に配設される着脱部材２３に一体的に固定される。このスタイレット１３Ｄの長さ寸法は、前記着脱部材２３を前記摺動部２２の基端部に装着した状態のとき、このスタイレット１３Ｄの先端部が所定量だけ前記針管１２の先端より突出する。そして、この配置状態のとき、前記針管１２から前記スタイレット１３Ｄの細径部１５が露出しないように、前記スタイレット１３Ｄの太径部１４の長さ寸法が設定してある。   The base end portion of the stylet 13D according to the present embodiment is integrally fixed to a detachable member 23 that is detachably disposed at the base end portion of the sliding portion 22 as in the first embodiment. The length of the stylet 13D is such that the distal end of the stylet 13D protrudes from the distal end of the needle tube 12 by a predetermined amount when the detachable member 23 is attached to the proximal end of the sliding portion 22. . In this arrangement state, the length dimension of the large diameter portion 14 of the stylet 13D is set so that the small diameter portion 15 of the stylet 13D is not exposed from the needle tube 12.

加えて、前記着脱部材２３を前記摺動部２２の基端部に装着した状態で、この摺動部２２を後退させ、前記操作部本体２１に対して最も基端側に配置させたとき、前記針管１２の先端より所定量突出したスタイレット１３Ｄの曲面部１３ｂが図に示すように前記シース１１の先端面から僅かに突出した状態又は、先端面とスタイレット１３Ｄの曲面部１３ｂの先端とが面一致した状態になる。   In addition, when the detachable member 23 is attached to the proximal end portion of the sliding portion 22, the sliding portion 22 is retracted, and is disposed on the most proximal side with respect to the operation portion main body 21. The curved surface portion 13b of the stylet 13D protruding a predetermined amount from the distal end of the needle tube 12 slightly protrudes from the distal end surface of the sheath 11 as shown in the drawing, or the distal end surface and the distal end of the curved surface portion 13b of the stylet 13D. Will be in a state where they are flush.

この状態であるとき、前記挿入部２の先端は、前記シース１１の面取り部１１ａ及び前記突出太径部２４の曲面部１３ｂが位置するので、この挿入部２の先端側で、生体或いは処置具チャンネルを形成するチューブ体等を傷付けることが防止される。   In this state, since the chamfered portion 11a of the sheath 11 and the curved surface portion 13b of the protruding large-diameter portion 24 are located at the distal end of the insertion portion 2, a living body or a treatment instrument is disposed on the distal end side of the insertion portion 2. It is possible to prevent the tube body or the like forming the channel from being damaged.

なお、前記細径部２５の径寸法を適宜設定することによって、挿入部２の可撓性が所望の状態に調整される。その他の構成は前記第１実施形態と同様であり、同部材には同符号を付して説明を省略する。   Note that the flexibility of the insertion portion 2 is adjusted to a desired state by appropriately setting the diameter of the small diameter portion 25. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

このように、本実施形態においては、穿刺針を構成するチャンネル挿入部を、シース、針管、突出太径部及び細径部を有するスタイレットで構成し、前記スタイレットの突出太径部をシースの先端近傍まで配設してチャンネル挿入部から中空部をなくしたことにより、処置具チャンネル内にチャンネル挿入部を挿通するときに発生する応力集中を緩和することができる。   Thus, in this embodiment, the channel insertion part constituting the puncture needle is constituted by a stylet having a sheath, a needle tube, a protruding large diameter part, and a small diameter part, and the protruding large diameter part of the stylet is a sheath. Since the hollow portion is eliminated from the channel insertion portion by disposing it up to the vicinity of the distal end, stress concentration generated when the channel insertion portion is inserted into the treatment instrument channel can be reduced.

このことによって、チャンネル挿入部を処置具チャンネル内に挿通していくとき、シースに折れ曲がり部が形成されることが防止される。その他の作用及び効果は前記第１実施形態と同様である。   This prevents a bent portion from being formed in the sheath when the channel insertion portion is inserted into the treatment instrument channel. Other operations and effects are the same as those in the first embodiment.

なお、突出太径部及び細径部を有するスタイレットは図に示した構成に限定されるものではなく、例えば図６（ａ）に示すように突出太径部２６を滑り性の良い例えばフッ素樹脂で形成し、細径部２７を例えばステンレスやニッケルチタンなどの金属棒で形成して、スタイレット１３Ｅを構成するようにしてもよい。符号２６ａは、前記細径部２７の先端部が配置される凹部であり、この太径部２６の凹部２６ａに、細径部２７の先端部を配置させた状態で例えば接着等によって、前記太径部２６と前記細径部２７とを一体固定する。このことによって、太径部２６と針管１２との摩擦抵抗が軽減されて、スタイレット１３Ｅの挿抜性をさらに向上させられる。   The stylet having the protruding large diameter portion and the small diameter portion is not limited to the configuration shown in the figure. For example, as shown in FIG. The stylet 13E may be configured by forming the resin and forming the small-diameter portion 27 with a metal rod such as stainless steel or nickel titanium. Reference numeral 26a denotes a recess in which the distal end portion of the small-diameter portion 27 is disposed, and the thick portion 26 is recessed with the distal end portion of the small-diameter portion 27 disposed therein, for example, by bonding or the like. The diameter portion 26 and the small diameter portion 27 are integrally fixed. As a result, the frictional resistance between the large-diameter portion 26 and the needle tube 12 is reduced, and the insertability of the stylet 13E can be further improved.

また、図６（ｂ）に示すようにスタイレット１３Ｆを、滑り性の良好な例えばフッ素樹脂等の樹脂棒で形成し、この樹脂棒に前述と同様に突出太径部２４と細径部２５とを設けるようにしても、突出太径部２４と針管１２との摩擦抵抗を軽減して、スタイレット１３Ｆの挿抜性をさらに向上させられる。   Further, as shown in FIG. 6B, the stylet 13F is formed of a resin rod such as a fluororesin having a good sliding property, and the protruding large diameter portion 24 and the small diameter portion 25 are formed on the resin rod in the same manner as described above. The friction resistance between the protruding large-diameter portion 24 and the needle tube 12 can be reduced, and the insertability of the stylet 13F can be further improved.

図７は太径部及び細径部を有するスタイレットの別の構成例を説明する図である。
上述した実施形態においてはスタイレット１３，…，１３Ｆを先端部を構成する太径部と、この先端部より基端側を構成する細径部とで構成していた。言い換えれば、前記スタイレット１３、…１３Ｆにおいては、細径部１５、１７、２５、２７の径寸法が略同一であった。 FIG. 7 is a diagram illustrating another configuration example of a stylet having a large diameter portion and a small diameter portion.
In the embodiment described above, the stylets 13,..., 13F are composed of a large diameter portion constituting the distal end portion and a small diameter portion constituting the proximal end side from the distal end portion. In other words, in the stylets 13,... 13F, the diameters of the small diameter portions 15, 17, 25, 27 were substantially the same.

これに対して、本実施形態の図に示すスタイレット１３Ｇでは、先端部に第１の太径部となる第１太径部２８ａを設けるとともに基端部にも、この第１太径部２８ａと略同径な第２の太径部となる第２太径部２８ｂを設けている。そして、この第１太径部２８ａと第２太径部２８ｂとの間に細径部２９を設けている。つまり、本実施形態のスタイレット１３Ｇでは、先端側から順に、第１太径部２８ａ、細径部２９、第２太径部２８ｂを連設している。   On the other hand, in the stylet 13G shown in the drawing of the present embodiment, the first large-diameter portion 28a is provided at the distal end portion and the first large-diameter portion 28a is provided at the base end portion. And a second large-diameter portion 28b, which is a second large-diameter portion having substantially the same diameter. A small-diameter portion 29 is provided between the first large-diameter portion 28a and the second large-diameter portion 28b. That is, in the stylet 13G of the present embodiment, the first large-diameter portion 28a, the small-diameter portion 29, and the second large-diameter portion 28b are connected in order from the distal end side.

前記スタイレット１３Ｆの細径部２９の長さ寸法は、内視鏡の挿入部が体腔内で湾曲する度合いの大きな部位である、挿入部先端側の湾曲部近傍及び湾曲部に連設する可撓管の先端部側までの長さを考慮して設定する。具体的には、細径部２９を、前記第１太径部２８ａの基端側から例えば２００ｍｍ程度の長さ寸法に設定する。また、前記細径部２９の径寸法についても挿入部２の可撓性を考慮して適宜設定する。   The length dimension of the small-diameter portion 29 of the stylet 13F can be connected to the vicinity of the bending portion on the distal end side of the insertion portion and the bending portion, where the insertion portion of the endoscope is highly curved in the body cavity. The length is set in consideration of the length to the distal end side of the flexible tube. Specifically, the small diameter portion 29 is set to a length dimension of, for example, about 200 mm from the base end side of the first large diameter portion 28a. In addition, the diameter of the small-diameter portion 29 is appropriately set in consideration of the flexibility of the insertion portion 2.

このことによって、このスタイレット１３Ｇ、針管１２、シース１１で構成される挿入部（不図示）においては、スタイレット１３Ｇを構成する細径部２７が配置される部分の可撓性が向上するので、内視鏡の挿入部の湾曲部近傍及び湾曲状態の可撓管の先端部側に対応して、この挿入部を挿通させることができるとともに、処置具チャンネルと挿入部との間の挿通抵抗を軽減させることができる。   As a result, in the insertion portion (not shown) constituted by the stylet 13G, the needle tube 12, and the sheath 11, the flexibility of the portion where the small diameter portion 27 constituting the stylet 13G is arranged is improved. The insertion portion can be inserted in correspondence with the vicinity of the bending portion of the insertion portion of the endoscope and the distal end portion side of the flexible tube in the bent state, and the insertion resistance between the treatment instrument channel and the insertion portion. Can be reduced.

また、スタイレット１３Ｇの細径部２９より基端側を第２太径部２８ｂとして構成したことによって、挿入部の基端側部の剛性が増し、挿入部を挿入するための力量が効率良く伝達される。   In addition, since the base end side of the small diameter portion 29 of the stylet 13G is configured as the second large diameter portion 28b, the rigidity of the base end side portion of the insertion portion is increased, and the amount of force for inserting the insertion portion is efficient. Communicated.

これらのことによって、挿入作業の際、折れ等が発生し難くなるとともに、スタイレット１３Ｇを針管１２内へ再挿入する際の作業性をさらに向上させることができる。その他の作用及び効果は上述した実施形態と同様である。   As a result, it is difficult for folds or the like to occur during the insertion operation, and the workability when the stylet 13G is reinserted into the needle tube 12 can be further improved. Other operations and effects are the same as those of the above-described embodiment.

図８ないし図１１は本発明の第２実施形態にかかり、図８はシース、針管、径寸法が一定なスタイレットを配置して構成されるチャンネル挿入部を説明する図、図９はスタイレットの他の構成を説明する図、図１０はスタイレットの別の構成を説明する図、図１１はスタイレットのまた他の構成を説明する図である。   8 to 11 are related to a second embodiment of the present invention. FIG. 8 is a diagram for explaining a channel insertion portion configured by arranging a sheath, a needle tube, and a stylet having a constant diameter, and FIG. 9 is a stylet. FIG. 10 is a diagram for explaining another configuration of the stylet, and FIG. 11 is a diagram for explaining another configuration of the stylet.

なお、図８（ａ）は軸ワイヤと樹脂部とで形成されるスタイレットの構成を説明する図、図８（ｂ）は軸ワイヤと樹脂部とで形成されるスタイレットの他の構成を説明する図、図８（ｃ）は軸ワイヤと樹脂部とで形成されるスタイレットの別の構成を説明する図である。   8A is a diagram for explaining the configuration of the stylet formed by the shaft wire and the resin portion, and FIG. 8B is another configuration of the stylet formed by the shaft wire and the resin portion. FIG. 8C is a diagram for explaining another configuration of the stylet formed by the shaft wire and the resin portion.

図８（ａ）に示すように本実施形態の挿入部２Ａはシース１１と、針管１２と、スタイレット３１とが配置されて構成される。
本実施形態のスタイレット３１は、前記挿入部２の可撓性を適宜設定する可撓性調整部を兼ねており、中心部を形成する例えばステンレス、ニッケルチタン合金などの金属ワイヤからなる軸ワイヤ３２と、この軸ワイヤ３２の周囲に一体的に設けられる樹脂部３３とで、径寸法を所定寸法に形成した線部材になっている。 As shown in FIG. 8A, the insertion portion 2A of this embodiment is configured by arranging a sheath 11, a needle tube 12, and a stylet 31.
The stylet 31 according to the present embodiment also serves as a flexibility adjusting portion that appropriately sets the flexibility of the insertion portion 2, and an axial wire made of a metal wire such as stainless steel or nickel titanium alloy that forms the central portion. 32 and the resin portion 33 provided integrally around the shaft wire 32 form a wire member having a predetermined diameter.

なお、前記樹脂部３３の先端外周面には、生体若しくは処置具チャンネルを形成するチューブ体に傷を付けることを防止する目的で、曲面或いは傾斜面による面取りである面取り部３３ａが設けてある。   A chamfered portion 33a that is a chamfered surface by a curved surface or an inclined surface is provided on the outer peripheral surface of the distal end of the resin portion 33 in order to prevent the tube body forming the living body or the treatment instrument channel from being damaged.

前記樹脂部３３を構成する樹脂部材は、前記軸ワイヤ３２とのインサート成形が可能で、柔軟でかつ滑り性の良好な、例えば、ＰＴＦＥ、ＰＦＡ等のフッ素樹脂、ポリエチレン、ナイロンなどである。   The resin member constituting the resin portion 33 is, for example, a fluororesin such as PTFE or PFA, polyethylene, nylon, etc., which can be insert-molded with the shaft wire 32 and is flexible and has a good sliding property.

この構成のスタイレット３１では、前記軸ワイヤ３２の径寸法と前記樹脂部３３の肉厚との関係を適宜設定することによって、このスタイレット３１の可撓性が調整可能である。そして、この可撓性を調整したスタイレット３１を針管１２内に挿通させることによって、挿入部２Ａの可撓性が所望する状態に調整される。   In the stylet 31 having this configuration, the flexibility of the stylet 31 can be adjusted by appropriately setting the relationship between the diameter dimension of the shaft wire 32 and the thickness of the resin portion 33. Then, by inserting the stylet 31 adjusted in flexibility into the needle tube 12, the flexibility of the insertion portion 2A is adjusted to a desired state.

このように、穿刺針を構成するチャンネル挿入部を、シース、針管、軸ワイヤ及び樹脂部で可撓性を調整したスタイレットで構成することによって、チャンネル挿入部の可撓性を所望の状態に設定することができる。このことによって、湾曲した状態の処置具チャンネルに沿ってスムーズな挿通が可能になるとともに、処置具チャンネルと挿入部との間の挿通抵抗を軽減される。   As described above, the channel insertion portion constituting the puncture needle is configured with a stylet whose flexibility is adjusted by the sheath, the needle tube, the shaft wire, and the resin portion, thereby bringing the flexibility of the channel insertion portion to a desired state. Can be set. Accordingly, smooth insertion along the curved treatment instrument channel is possible, and insertion resistance between the treatment instrument channel and the insertion portion is reduced.

なお、本実施形態においてはスタイレット３１の長さ寸法を中空部１０が構成される長さ寸法としているが、スタイレット３１の先端が前記シース１１の先端面から僅かに突出した状態又は、先端面とスタイレット３１の先端面とが面一致した状態になるように長さ設定するようにしてもよい。   In the present embodiment, the length dimension of the stylet 31 is the length dimension of the hollow portion 10, but the stylet 31 tip slightly protrudes from the distal end surface of the sheath 11, or the tip The length may be set so that the surface and the front end surface of the stylet 31 are flush with each other.

また、図８（ｂ）に示すようにスタイレット３１Ａを構成する軸ワイヤ３２Ａの径寸法を、例えば先端側から約２００ｍｍ近傍までと、それよりから基端側とで変化させる、具体的には、軸ワイヤ３２Ａを細径部３２ｂと、太径部３２ｃとを設けて構成し、この軸ワイヤ３２の細径部３２ｂと太径部３２ｃとの周囲に肉厚を変化させた樹脂部３３を設けて外形寸法が一定のスタイレット３１Ａを形成する。このとき、太径部３２ｃの寸法によっては、樹脂部３３を設けることなくスタイレット３１Ａを構成するようにしてもよい。   Further, as shown in FIG. 8 (b), the diameter dimension of the shaft wire 32A constituting the stylet 31A is changed, for example, from the distal end side to about 200 mm and from there to the proximal end side, specifically, The shaft wire 32A is configured by providing a small diameter portion 32b and a large diameter portion 32c, and a resin portion 33 having a changed thickness around the thin diameter portion 32b and the large diameter portion 32c of the shaft wire 32. A stylet 31A having a constant outer dimension is provided. At this time, depending on the size of the large diameter portion 32c, the stylet 31A may be configured without providing the resin portion 33.

さらに、図８（ｃ）に示すようにスタイレット３１Ｂを構成する軸ワイヤ３２の周囲に設ける樹脂部を、硬度の異なる樹脂部３３ｂ、３３ｃとしてもよい。具体的には、先端側から約２００ｍｍ近傍までの樹脂部を柔軟でかつ滑り性の良好な軟性樹脂部３３ｂで形成し、それより基端側を前記軟性樹脂部３３ｂを構成する樹脂よりも硬めの樹脂部材である例えば、ＰＶＤＦ等のフッ素樹脂、高密度ポリエチレン、ポリエーテルエーテルケトンなどの硬性樹脂部３３ｃで形成する。   Further, as shown in FIG. 8C, the resin portions provided around the shaft wire 32 constituting the stylet 31B may be resin portions 33b and 33c having different hardnesses. Specifically, the resin portion from the distal end side to the vicinity of about 200 mm is formed of a soft resin portion 33b that is flexible and has good sliding properties, and the base end side is harder than the resin that constitutes the soft resin portion 33b. For example, it is formed of a hard resin portion 33c such as a fluororesin such as PVDF, high density polyethylene, or polyetheretherketone.

これらのことによって、スタイレット３１Ａ、３１Ｂの先端側から約２００ｍｍ近傍まで所望の可撓性を得られる一方、基端側においては剛性を高めて、スタイレット３１Ａ、３１Ｂを針管１２に再挿入する際の作業性を向上させることができる。   As a result, desired flexibility can be obtained from the distal end side of the stylets 31A and 31B to about 200 mm, while the rigidity is increased on the proximal end side, and the stylets 31A and 31B are reinserted into the needle tube 12. The workability at the time can be improved.

なお、挿入部２Ａの可撓性を調整する径寸法が一定なスタイレットは、軸ワイヤと樹脂部との構成に限定されるものではなく、図９に示すように軸ワイヤ３２と、この軸ワイヤ３２の周囲に配設されるコイル部材３４とでスタイレット３１Ｃを構成するようにしてもよい。このコイル部材３４は、例えばステンレス、ニッケルチタン合金などの金属コイルである。前記軸ワイヤ３２とコイル部材３４とは一体に配置した状態で、先端部、基端部、及びその他数個所に溶接部若しくは接着部を設けて、一体接合されている。   Note that the stylet with a constant diameter that adjusts the flexibility of the insertion portion 2A is not limited to the configuration of the shaft wire and the resin portion. As shown in FIG. 9, the shaft wire 32 and the shaft The stylet 31 </ b> C may be configured with the coil member 34 disposed around the wire 32. The coil member 34 is a metal coil such as stainless steel or nickel titanium alloy. In a state where the shaft wire 32 and the coil member 34 are integrally disposed, a welded portion or an adhesive portion is provided at the distal end portion, the proximal end portion, and several other portions, and are integrally joined.

この構成のスタイレット３１Ｃでは、前記軸ワイヤ３２の径寸法と前記コイル部材３４の線径或いはピッチとの関係を適宜設定することによって、このスタイレット３１Ｃの可撓性が調整可能である。そして、この可撓性を調整したスタイレット３１Ｃを針管１２内に挿通させることによって、挿入部２Ａの可撓性を所望する状態に調整することができる。   In the stylet 31C having this configuration, the flexibility of the stylet 31C can be adjusted by appropriately setting the relationship between the diameter of the shaft wire 32 and the wire diameter or pitch of the coil member 34. Then, by inserting the stylet 31 </ b> C whose flexibility is adjusted into the needle tube 12, the flexibility of the insertion portion 2 </ b> A can be adjusted to a desired state.

なお、前記コイル部材３４をスタイレット３１Ｃの先端側（例えば先端から約２００ｍｍまで）に限定して設け、それより基端側で軸ワイヤ３２の外径寸法を太径に構成することによって、スタイレット３１Ｃの基端側の剛性を高めて、スタイレット３１Ｃを針管１２に再挿入する際の作業性を向上させるようにしてもよい。   The coil member 34 is limited to the distal end side of the stylet 31C (for example, about 200 mm from the distal end), and the outer diameter of the shaft wire 32 is configured to be thicker on the proximal end side, thereby providing a styling. You may make it improve the workability | operativity at the time of reinserting the stylet 31C in the needle tube 12 by raising the rigidity of the base end side of the lett 31C.

また、図１０に示すようにスタイレット３１Ｄを例えばステンレス、ニッケルチタン合金製の金属パイプとしてもよい。この構成のスタイレット３１Ｄでは、前記金属パイプを構成する貫通孔３５の内径寸法を適宜設定することによって、このスタイレット３１Ｄの可撓性が所望する状態に調整される。そして、このスタイレット３１Ｄを針管１２内に挿通させることによって挿入部２Ａの可撓性を所望する状態に設定することができる。
なお、このスタイレット１３Ｄの先端においては、パイプ開口部を樹脂部材、接着剤、若しくは溶接等により塞ぐ構成にしてもよい。 Further, as shown in FIG. 10, the stylet 31D may be a metal pipe made of, for example, stainless steel or nickel titanium alloy. In the stylet 31D having this configuration, the flexibility of the stylet 31D is adjusted to a desired state by appropriately setting the inner diameter dimension of the through hole 35 constituting the metal pipe. And by inserting this stylet 31D into the needle tube 12, the flexibility of the insertion portion 2A can be set to a desired state.
In addition, you may make it the structure which plugs a pipe opening part by the resin member, an adhesive agent, welding, etc. in the front-end | tip of this stylet 13D.

さらに、図１１に示すようにスタイレット３１Ｄの先端に刃面３６を形成するようにしてもよい。このことによって、針管１２が刺さり難い観察部位においては、この針管１２を刺入する代わりにより細径なスタイレット３１Ｄを刺入して検体の採取を行う。このことによって、針管１２での穿刺が困難な際、穿刺針を交換することなく、瞬時に細径のスタイレット１３Ｄを刺入して検体の採取を行うことができる。   Furthermore, a blade surface 36 may be formed at the tip of the stylet 31D as shown in FIG. As a result, in the observation site where the needle tube 12 is difficult to be inserted, the sample is collected by inserting the small stylet 31D instead of inserting the needle tube 12. As a result, when it is difficult to puncture with the needle tube 12, the sample can be collected by inserting the small-sized stylet 13D instantaneously without replacing the puncture needle.

図１２は挿入部の可撓性を調整する可撓性調整部を備える針管を説明する図である。
図１２（ａ）及び図１２（ｂ）に示すように本実施形態においては針管４０を、金属ワイヤ４１と樹脂チューブ４２とで構成されるハイブリツド素材で形成している。前記金属ワイヤ４１は扁平円弧状の断面形状であり、この金属ワイヤ４１はインサート成形により樹脂チューブ４２の壁の一部を構成するように一体成形されている。前記樹脂チューブ４２は、例えばフッ素樹脂、ポリエチレン、ナイロン、ポリイミド等、生体適合性と滑り性に優れた樹脂部材で形成される。 FIG. 12 is a diagram illustrating a needle tube including a flexibility adjusting unit that adjusts the flexibility of the insertion unit.
As shown in FIGS. 12A and 12B, in this embodiment, the needle tube 40 is formed of a hybrid material composed of a metal wire 41 and a resin tube 42. The metal wire 41 has a flat arc-shaped cross-sectional shape, and the metal wire 41 is integrally formed so as to constitute a part of the wall of the resin tube 42 by insert molding. The resin tube 42 is formed of a resin member having excellent biocompatibility and slipperiness, such as fluororesin, polyethylene, nylon, polyimide, and the like.

前記金属ワイヤ４１は例えばステンレス、ニッケルチタン合金など生体適合性に優れた金属素材であり、先端部は針先４１ａとして構成され、この針先４１ａには刃面４１ｂが形成されている。   The metal wire 41 is a metal material excellent in biocompatibility, such as stainless steel and nickel titanium alloy, for example, and the tip portion is configured as a needle tip 41a, and a blade surface 41b is formed on the needle tip 41a.

なお、前記金属ワイヤ４１の断面形状は刃面４１ｂを形成することが可能であれば、円弧状に限定されるものではなく、円形や方形等であってもよい。   The cross-sectional shape of the metal wire 41 is not limited to an arc shape as long as the blade surface 41b can be formed, and may be a circle, a square, or the like.

このように、針管を、金属ワイヤと樹脂チューブとで構成されるハイブリツド素材で形成することによって、金属パイプで形成される針管に比較して可撓性を向上させることができる。   Thus, by forming the needle tube with a hybrid material composed of a metal wire and a resin tube, flexibility can be improved compared to a needle tube formed of a metal pipe.

そして、この針管を使用して穿刺針の挿入部を構成することによって、挿入部の可撓性を所望の状態に調整することができる。また、この針管と前述したスタイレットを組み合わせて使用して穿刺針の挿入部を構成することによって、挿入部の可撓性の微調整を可能にすることができる。   And the flexibility of an insertion part can be adjusted to a desired state by comprising the insertion part of a puncture needle using this needle tube. Further, by using this needle tube in combination with the above-mentioned stylet to constitute the insertion portion of the puncture needle, it is possible to make fine adjustment of the flexibility of the insertion portion.

なお、本発明は、以上述べた実施形態のみに限定されるものではなく、発明の要旨を逸脱しない範囲で種々変形実施可能である。   It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

［付記］
以上詳述したような本発明の上記実施形態によれば、以下の如き構成を得ることができる。 [Appendix]
According to the embodiment of the present invention as described above in detail, the following configuration can be obtained.

（１）内視鏡の挿入部に設けられた処置具チャンネル内に挿通されるチャンネル挿入部を、前記処置具チャンネルに挿通自在なシースと、このシース内に挿通配置され、観察部位に穿刺される針管と、この針管内に挿抜自在で針管内の生体組織等を管内から除去するスタイレットとで構成する穿刺針において、
前記スタイレットは、前記チャンネル挿入部の可撓性を調整する可撓性調整部を兼ねる穿刺針。 (1) A channel insertion portion that is inserted into a treatment instrument channel provided in an insertion portion of an endoscope, a sheath that can be inserted through the treatment instrument channel, and a sheath that is inserted through the sheath, are punctured at an observation site. In a puncture needle configured with a needle tube and a stylet that can be inserted into and removed from the needle tube and remove biological tissue in the needle tube from the tube,
The stylet is a puncture needle that also serves as a flexibility adjusting portion that adjusts the flexibility of the channel insertion portion.

（２）前記スタイレットを、前記針管の内周面に対して所定のクリアランスを有する少なくとも先端部を構成する太径部と、この太径部より細径で前記可撓性調整部となる細径部とで構成した付記１に記載の穿刺針。 (2) The stylet has a large diameter portion constituting at least a distal end portion having a predetermined clearance with respect to the inner peripheral surface of the needle tube, and a narrow diameter smaller than the large diameter portion and serving as the flexible adjustment portion. The puncture needle according to appendix 1, which is configured with a diameter portion.

（３）前記スタイレットを、同一径寸法のパイプ部材で構成した付記１に記載の穿刺針。 (3) The puncture needle according to appendix 1, wherein the stylet is configured by a pipe member having the same diameter.

（４）前記スタイレットを、１つ以上の金属部材で構成した付記２又は付記３に記載の穿刺針。 (4) The puncture needle according to supplementary note 2 or supplementary note 3, wherein the stylet is composed of one or more metal members.

（５）前記スタイレットを、異なる部材の組合せで構成した付記２又は付記３に記載の穿刺針。 (5) The puncture needle according to appendix 2 or appendix 3, wherein the stylet is configured by a combination of different members.

（６）前記スタイレットを、樹脂部材、又は樹脂部材と金属部材とで構成した付記２又は付記３に記載の穿刺針。 (6) The puncture needle according to appendix 2 or appendix 3, wherein the stylet is made of a resin member, or a resin member and a metal member.

（７）前記スタイレットの少なくとも一部にコイルバネを設けた付記３に記載の穿刺針。 (7) The puncture needle according to appendix 3, wherein a coil spring is provided on at least a part of the stylet.

（８）前記スタイレットの細径部外径寸法（φＤ１）と太径部外形寸法（φＤ２）との間に、
φＤ２Ｘ０．５＜φＤ１＜φＤ２Ｘ０．８５
の関係を設定した付記２に記載の穿刺針。 (8) Between the outer diameter dimension (φD1) and the outer diameter dimension (φD2) of the small diameter portion of the stylet,
φD2X0.5 <φD1 <φD2X0.85
The puncture needle according to appendix 2, in which the relationship is set.

（９）前記スタイレットの先端部を球面、若しくは曲面仕上げにした付記２ないし付記８のいずれかに記載の穿刺針。 (9) The puncture needle according to any one of appendix 2 to appendix 8, wherein the tip of the stylet has a spherical or curved finish.

（１０）前記スタイレットの先端部に、先端が前記シースの先端面近傍に配置される突出太径部を設けた付記１に記載の穿刺針。 (10) The puncture needle according to appendix 1, wherein the distal end portion of the stylet is provided with a protruding large diameter portion whose distal end is disposed in the vicinity of the distal end surface of the sheath.

（１１）前記針管をワイヤ状の金属部材と樹脂チューブの混合材料で構成し、前記ワイヤ状の金属部材の先端部の少なくとも一部に刃面を形成した穿刺針。 (11) A puncture needle in which the needle tube is made of a mixed material of a wire-like metal member and a resin tube, and a blade surface is formed on at least a part of the distal end portion of the wire-like metal member.

図１ないし図４は本発明の第１実施形態に係り、図１は穿刺針の構成を説明する図1 to 4 relate to a first embodiment of the present invention, and FIG. 1 is a diagram for explaining the configuration of a puncture needle. シース、針管、太径部及び細径部を有するスタイレットを配置して構成されるチャンネル挿入部を説明する断面図Sectional drawing explaining the channel insertion part comprised by arrange | positioning the stylet which has a sheath, a needle tube, a large diameter part, and a thin diameter part 先端部の形状に特徴のあるスタイレットを説明する断面図Sectional drawing explaining the stylet with the shape of the tip スタイレットの他の構成を説明する断面図Sectional drawing explaining other structures of stylet 図５及び図６は本発明の変形例にかかり、図５はチャンネル挿入部のシースにかかる応力集中を防止するスタイレットの構成を説明する図5 and 6 relate to a modification of the present invention, and FIG. 5 is a diagram for explaining the configuration of a stylet for preventing stress concentration on the sheath of the channel insertion portion. チャンネル挿入部のシースにかかる応力集中を防止するスタイレットの他の構成例を説明する図The figure explaining the other structural example of the stylet which prevents the stress concentration concerning the sheath of a channel insertion part 太径部及び細径部を有するスタイレットの別の構成例を説明する図The figure explaining another structural example of the stylet which has a large diameter part and a small diameter part 図８ないし図１１は本発明の第２実施形態にかかり、図８はシース、針管、径寸法が一定なスタイレットを配置して構成されるチャンネル挿入部を説明する図8 to 11 relate to a second embodiment of the present invention, and FIG. 8 is a diagram for explaining a channel insertion portion configured by arranging a sheath, a needle tube, and a stylet having a constant diameter. スタイレットの他の構成を説明する図The figure explaining other composition of a stylet スタイレットの別の構成を説明する図A diagram illustrating another stylet configuration スタイレットのまた他の構成を説明する図The figure explaining other composition of a stylet 挿入部の可撓性を調整する可撓性調整部を備える針管を説明する図The figure explaining the needle tube provided with the flexibility adjustment part which adjusts the flexibility of an insertion part 従来より使用されている穿刺針の挿入部の構成を説明する図The figure explaining the structure of the insertion part of the puncture needle conventionally used

符号の説明Explanation of symbols

１…穿刺針
２…チャンネル挿入部
１１…シース
１２…針管
１３…スタイレット
１４…太径部
１５…細径部
代理人 弁理士 伊藤 進 DESCRIPTION OF SYMBOLS 1 ... Puncture needle 2 ... Channel insertion part 11 ... Sheath
12 ... Needle tube
13 ... Stylet
14 ... Diameter part
15 ... Thin diameter part
Attorney Susumu Ito

Claims (2)

内視鏡の挿入部に設けられた処置具チャンネル内に挿通されるチャンネル挿入部を、前記処置具チャンネルに挿通自在なシースと、このシース内に挿通配置され、観察部位に穿刺される針管と、この針管内に挿抜自在で針管内の生体組織等を管内から除去するスタイレットとで構成する穿刺針において、
前記スタイレットは、前記チャンネル挿入部の可撓性を調整する可撓性調整部を兼ねることを特徴とする穿刺針。 A channel insertion portion that is inserted into a treatment instrument channel provided in an insertion portion of an endoscope, a sheath that can be inserted into the treatment instrument channel, and a needle tube that is inserted into the sheath and punctured into an observation site, In a puncture needle configured with a stylet that can be inserted into and removed from the needle tube and remove biological tissue in the needle tube from the tube,
The puncture needle, wherein the stylet also serves as a flexibility adjusting portion that adjusts the flexibility of the channel insertion portion. 前記スタイレットを、前記針管の内周面に対して所定のクリアランスを有する少なくとも先端部を構成する太径部と、この太径部より細径で前記可撓性調整部となる細径部とで構成したことを特徴とする請求項１に記載の穿刺針。 The stylet has a large diameter portion constituting at least a distal end portion having a predetermined clearance with respect to the inner peripheral surface of the needle tube, and a small diameter portion having a smaller diameter than the large diameter portion and serving as the flexible adjustment portion. The puncture needle according to claim 1, comprising:
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JP2005270664A (en) * 2004-03-24 2005-10-06 Ethicon Endo Surgery Inc Biopsy device
JP4597732B2 (en) * 2004-03-24 2010-12-15 エシコン・エンド−サージェリィ・インコーポレイテッド Biopsy equipment
JP2007020868A (en) * 2005-07-15 2007-02-01 Olympus Medical Systems Corp Puncture needle for endoscope
JP4632887B2 (en) * 2005-07-15 2011-02-16 オリンパスメディカルシステムズ株式会社 Endoscopic puncture needle
US11298113B2 (en) 2008-10-01 2022-04-12 Covidien Lp Device for needle biopsy with integrated needle protection
US10888689B2 (en) 2008-10-01 2021-01-12 Covidien Lp Endoscopic ultrasound-guided biliary access system
JP2015107324A (en) * 2008-10-01 2015-06-11 コヴィディエン リミテッド パートナーシップ Needle biopsy device
US9782565B2 (en) 2008-10-01 2017-10-10 Covidien Lp Endoscopic ultrasound-guided biliary access system
US9913630B2 (en) 2008-10-01 2018-03-13 Covidien Lp Device for needle biopsy with integrated needle protection
US11039816B2 (en) 2008-10-01 2021-06-22 Covidien Lp Needle biopsy device with exchangeable needle and integrated needle protection
CN102843975A (en) * 2010-04-06 2012-12-26 库克医学技术有限责任公司 Endoscopic ultrasound-guided biopsy needle
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WO2011126109A1 (en) * 2010-04-08 2011-10-13 学校法人久留米大学 Puncture aspiration method and puncture aspiration device
CN103654871A (en) * 2012-09-25 2014-03-26 常州德天医疗器械有限公司 Universal through-endoscope puncture instrument for multiple organs
EP2905046A4 (en) * 2012-10-04 2016-06-01 Unisis Corp Stylet for medical needle and medical needle
CN102920487B (en) * 2012-10-31 2015-10-28 常州德天医疗器械有限公司 Through scope crosspointer puncture instrument
CN102920487A (en) * 2012-10-31 2013-02-13 常州德天医疗器械有限公司 Endoscopic double-needle puncture device
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