JP2010194013A - Puncture needle for ultrasonic endoscope - Google Patents

Puncture needle for ultrasonic endoscope Download PDF

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JP2010194013A
JP2010194013A JP2009040732A JP2009040732A JP2010194013A JP 2010194013 A JP2010194013 A JP 2010194013A JP 2009040732 A JP2009040732 A JP 2009040732A JP 2009040732 A JP2009040732 A JP 2009040732A JP 2010194013 A JP2010194013 A JP 2010194013A
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ultrasonic
needle tube
needle
ultrasonic endoscope
puncture needle
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Masayasu Sato
雅康 佐藤
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Hoya Corp
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Hoya Corp
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3925—Markers, e.g. radio-opaque or breast lesions markers ultrasonic

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a puncture needle for an ultrasonic endoscope, obtaining a clear ultrasonic echo image of a needle tube by effectively increasing the ultrasonic echo at the distal end of the needle tube punctured into a living tissue when a convex ultrasonic probe is inserted into a treatment instrument insertion channel of the ultrasonic endoscope to be used. <P>SOLUTION: A plurality of hollows 15 for enhancing the reflection intensity of the ultrasonic echo are formed on the outer surface in the vicinity of the distal end of the needle tube 12 to be punctured into the living tissue. Each hollow 15 has an ultrasonic reflecting face 15A formed obliquely backward from the surface of the needle tube 12 toward the inner side, and is formed in such a state (15B) that the wall of the needle tube 12 is scraped off to prevent the space in the direction perpendicular to the ultrasonic reflecting face 15A from being blocked by the wall of the needle tube 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、超音波内視鏡の処置具挿通チャンネルに通して体腔内に導かれ、生体組織の採取や薬液の注射等に用いられる超音波内視鏡用穿刺針に関する。   The present invention relates to a puncture needle for an ultrasonic endoscope that is guided into a body cavity through a treatment instrument insertion channel of an ultrasonic endoscope and used for collection of a living tissue, injection of a medical solution, and the like.

超音波内視鏡の処置具挿通チャンネルに通して体腔内に導かれた超音波内視鏡用穿刺針の針管の先端部分は、超音波内視鏡の先端に配置された超音波プローブによる超音波走査領域に突き出されて、生体組織の断層像等と共に超音波の反射エコー像として観察される。   The tip of the needle tube of the puncture needle for an ultrasonic endoscope, which is guided into the body cavity through the treatment instrument insertion channel of the ultrasonic endoscope, is ultrasonicated by an ultrasonic probe placed at the tip of the ultrasonic endoscope. It protrudes into the sound wave scanning region and is observed as a reflected echo image of an ultrasonic wave together with a tomographic image of a living tissue.

しかし、体内に突出される超音波内視鏡用穿刺針の針管の先端部分は直径が例えば１ｍｍにも満たない細いものなので、超音波の反射エコー強度が極めて小さく、針管の明瞭な超音波画像を得ることができない場合が少なくない。   However, since the tip of the needle tube of the puncture needle for ultrasonic endoscope protruding into the body is a thin one having a diameter of less than 1 mm, for example, the reflected echo intensity of the ultrasonic wave is extremely small, and a clear ultrasonic image of the needle tube There are many cases where you cannot get.

そこで従来は、針管の外周面に円環状や直線状の微細な窪みを多数形成することにより、超音波の反射エコー強度を増大させて、針管の明瞭な超音波エコー画像を得ることができるようにしていた（例えば、特許文献１、２）。   Therefore, conventionally, by forming a large number of circular or linear fine depressions on the outer peripheral surface of the needle tube, the reflected echo intensity of the ultrasonic wave can be increased and a clear ultrasonic echo image of the needle tube can be obtained. (For example, Patent Documents 1 and 2).

特開２００４−１８１０９５JP2004-181095 特開平１１−７６２５４JP-A-11-76254

超音波内視鏡用穿刺針が用いられる超音波内視鏡には一般に、挿入部の側方を前後に扇形に走査するいわゆるコンベックス型の超音波プローブが最先端部に設けられており、穿刺針がそのような超音波内視鏡の処置具挿通チャンネルに通して使用される。   In general, an ultrasonic endoscope using a puncture needle for an ultrasonic endoscope is provided with a so-called convex ultrasonic probe that scans a side of the insertion portion in a front-and-rear direction at the leading edge. A needle is used through the treatment instrument insertion channel of such an ultrasonic endoscope.

図６はその状態を略示しており、超音波プローブ２３の後方に配置された処置具突出口２１ａから斜め前方に突き出された穿刺針の針管１２が生体組織１００に穿刺され、その状態が超音波プローブ２３から発受信される超音波信号により超音波エコー画像として観察される。   FIG. 6 schematically shows the state, and the needle tube 12 of the puncture needle that protrudes obliquely forward from the treatment instrument protrusion 21a disposed behind the ultrasonic probe 23 is punctured into the living tissue 100, and the state is extremely high. An ultrasonic echo image is observed by an ultrasonic signal transmitted and received from the acoustic probe 23.

その際に、針管１２が生体組織１００に対しどの位置で突き刺されて、生体組織１００中にどの程度の深さまで達しているのか、そして針先の周辺はどのような組織なのかが、針管１２のエコー情報として最も必要とされるものである。そのようなエコー画像の描出必要領域は一般に、図６にＡで示されるように、超音波プローブ２３の正面及びそこから少し先端側に寄った領域である。   At this time, the needle tube 12 determines where the needle tube 12 is pierced with respect to the living tissue 100, what depth the needle tube 12 reaches in the living tissue 100, and what kind of tissue is around the needle tip. Is most needed as echo information. Such an echo image rendering required region is generally a region close to the front side of the ultrasonic probe 23 and slightly to the tip side, as indicated by A in FIG.

ところが、特許文献１、２等に記載されているような従来の超音波内視鏡用穿刺針では、針管１２に形成されている窪みの超音波反射面が、描出必要領域Ａにおいては破線で例示される超音波信号Ｕの進行方向に対して垂直又は垂直に近い向きにならないので、針管１２にせっかく形成されている窪みの超音波反射機能が有効に発揮されず、針管１２の明瞭な超音波エコー画像を得られない場合が少なくなかった。   However, in conventional puncture needles for ultrasonic endoscopes as described in Patent Documents 1 and 2, etc., the ultrasonic reflection surface of the depression formed in the needle tube 12 is indicated by a broken line in the rendering required region A. Since it is not perpendicular or nearly perpendicular to the traveling direction of the illustrated ultrasonic signal U, the ultrasonic reflection function of the depression formed in the needle tube 12 is not exhibited effectively, and the needle tube 12 is clearly In many cases, a sound echo image could not be obtained.

本発明は、コンベックス型の超音波プローブが先端に設けられた超音波内視鏡の処置具挿通チャンネルに通して使用される場合に、生体組織に穿刺される針管の先端部分の超音波エコーを効果的に増大させて、針管の明瞭な超音波エコー画像を得ることができる超音波内視鏡用穿刺針を提供することを目的とする。   In the present invention, when a convex ultrasonic probe is used through a treatment instrument insertion channel of an ultrasonic endoscope provided at a distal end, an ultrasonic echo of a distal end portion of a needle tube punctured in a living tissue is detected. An object of the present invention is to provide a puncture needle for an ultrasonic endoscope that can be effectively increased to obtain a clear ultrasonic echo image of a needle tube.

上記の目的を達成するため、本発明の超音波内視鏡用穿刺針は、超音波内視鏡の処置具挿通チャンネルに挿脱される超音波内視鏡用穿刺針であって、生体組織に穿刺される針管を備え、針管の先端付近の外周面に、超音波エコーの反射強度を増大させるための複数の窪みが形成されたものにおいて、各窪みが、針管の表面からその内側に向かって斜め後方向きに形成された超音波反射面を備えると共に、超音波反射面に対し垂直をなす方向の空間が針管の壁肉で遮られないように針管の壁肉が削除された状態に形成されているものである。   To achieve the above object, a puncture needle for an ultrasonic endoscope of the present invention is a puncture needle for an ultrasonic endoscope that is inserted into and removed from a treatment instrument insertion channel of an ultrasonic endoscope, and is a biological tissue. A plurality of depressions are formed on the outer peripheral surface near the tip of the needle tube to increase the reflection intensity of the ultrasonic echo, and each depression extends from the surface of the needle tube to the inside thereof. In addition to the ultrasonic reflection surface formed obliquely rearward, the needle tube wall is removed so that the space perpendicular to the ultrasonic reflection surface is not obstructed by the needle tube wall. It is what has been.

なお、各超音波反射面が、針管の軸線に対して略３０°〜６０°をなす範囲で斜め後方向きに形成されているとよく、各窪みが点状に形成されて、針管の外周部に千鳥配列又は整列状態に配置されていてもよい。或いは、各窪みが、針管の外周部に円周溝状に形成されていてもよい。   Each ultrasonic reflection surface is preferably formed obliquely rearward in a range of approximately 30 ° to 60 ° with respect to the axis of the needle tube, and each depression is formed in a dot shape so that the outer peripheral portion of the needle tube is formed. May be arranged in a staggered arrangement or in an aligned state. Alternatively, each recess may be formed in a circumferential groove shape on the outer periphery of the needle tube.

また、超音波反射面が針管の軸線に対してなす角度が、針管の先端に近い窪みほど大きな角度に形成されていてもよく、針管が、可撓性シース内に軸線方向に進退自在に配置されたものであってもよい。   Further, the angle formed by the ultrasonic reflection surface with respect to the axis of the needle tube may be formed to be larger as the recess closer to the tip of the needle tube, and the needle tube is disposed in the flexible sheath so as to be able to advance and retract in the axial direction. It may be what was done.

本発明によれば、針管の先端付近の外周面に超音波エコーの反射強度を増大させるために形成された窪みが、針管の表面からその内側に向かって斜め後方向きに形成された超音波反射面を備え、その前方の針管の壁肉が削除されていることにより、コンベックス型の超音波プローブが先端に設けられた超音波内視鏡の処置具挿通チャンネルに通して使用される場合に、生体組織に穿刺される針管の先端部分の超音波エコーを効果的に増大させて、針管の明瞭な超音波エコー画像を得ることができる。   According to the present invention, the recess formed in the outer peripheral surface near the tip of the needle tube to increase the reflection intensity of the ultrasonic echo is formed in the obliquely rearward direction from the surface of the needle tube toward the inside thereof. When the convex type ultrasonic probe is used through the treatment instrument insertion channel of the ultrasonic endoscope provided at the distal end by removing the wall of the needle tube in front of the surface, A clear ultrasonic echo image of the needle tube can be obtained by effectively increasing the ultrasonic echo at the tip of the needle tube that is punctured into the living tissue.

本発明の超音波内視鏡用穿刺針を構成する針管の第１の実施例の先端部分の拡大斜視図である。1 is an enlarged perspective view of a distal end portion of a first embodiment of a needle tube constituting a puncture needle for an ultrasonic endoscope of the present invention. FIG. 本発明の超音波内視鏡用穿刺針を構成する針管の第１の実施例の先端部分の拡大側面断面図である。It is an expanded side sectional view of the tip part of the 1st example of the needle tube which constitutes the puncture needle for ultrasonic endoscopes of the present invention. 本発明の実施例における超音波内視鏡用穿刺針の全体構成図である。1 is an overall configuration diagram of a puncture needle for an ultrasonic endoscope in an embodiment of the present invention. 本発明の超音波内視鏡用穿刺針を構成する針管の第２の実施例の先端部分の拡大側面図である。It is an enlarged side view of the front-end | tip part of the 2nd Example of the needle tube which comprises the puncture needle for ultrasonic endoscopes of this invention. 本発明の超音波内視鏡用穿刺針を構成する針管の第３の実施例の先端部分の拡大側面断面図である。It is an expanded side sectional view of the tip part of the 3rd example of the needle tube which constitutes the puncture needle for ultrasonic endoscopes of the present invention. コンベックス型の超音波プローブを有する超音波内視鏡で穿刺針が使用される状態の略示図である。It is a schematic diagram of a state where a puncture needle is used in an ultrasonic endoscope having a convex-type ultrasonic probe.

以下、図面を参照して本発明の実施例を説明する。
図３は、超音波内視鏡用穿刺針１０が公知の超音波内視鏡２０の処置具挿通チャンネル２１に挿通されて、超音波内視鏡用穿刺針１０の先端部分が処置具挿通チャンネル２１の先端部分から突出した状態を示している。２３は、超音波内視鏡２０の挿入部２２の先端に配置されたコンベックス型の超音波プローブである。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 shows that the puncture needle 10 for an ultrasonic endoscope is inserted into a treatment instrument insertion channel 21 of a known ultrasonic endoscope 20, and the distal end portion of the puncture needle 10 for an ultrasonic endoscope is a treatment instrument insertion channel. The state which protruded from the front-end | tip part of 21 is shown. Reference numeral 23 denotes a convex ultrasonic probe disposed at the distal end of the insertion portion 22 of the ultrasonic endoscope 20.

超音波内視鏡用穿刺針１０は、処置具挿通チャンネル２１内に挿脱自在な可撓性シース１１内に、軸線方向に進退自在に可撓性の針管１２が全長にわたって挿通配置された構成を備えている。針管１２としては、例えば薄肉厚のステンレス鋼パイプ又はその他の金属パイプ材を用いることができる。   The puncture needle 10 for an ultrasonic endoscope has a configuration in which a flexible needle tube 12 is inserted through the entire length of a flexible sheath 11 detachably inserted into a treatment instrument insertion channel 21 so as to be movable back and forth in the axial direction. It has. As the needle tube 12, for example, a thin-walled stainless steel pipe or other metal pipe material can be used.

可撓性シース１１としては、例えば四フッ化エチレン樹脂チューブやＰＥＥＫ（ポリエーテルエーテルケトン）樹脂チューブ、又はステンレス鋼線を一定の径で管状に巻いたコイルパイプ等を用いることができる。   As the flexible sheath 11, for example, a tetrafluoroethylene resin tube, a PEEK (polyether ether ketone) resin tube, or a coil pipe in which a stainless steel wire is wound in a tubular shape with a constant diameter can be used.

可撓性シース１１の基端には筒状の把持部１３が連結されていて、針管１２の基端に連結された針元口金１４が把持部１３の基端部から外方に突出している。針管１２と針元口金１４は可撓性シース１１と把持部１３に対して軸線方向にスライド自在であり、把持部１３に対して針元口金１４をスライド操作することにより、可撓性シース１１の先端１１ａから針管１２の先端を突没させることができる。   A cylindrical gripping portion 13 is connected to the base end of the flexible sheath 11, and a needle base 14 connected to the base end of the needle tube 12 protrudes outward from the base end portion of the gripping portion 13. . The needle tube 12 and the needle base 14 are slidable in the axial direction with respect to the flexible sheath 11 and the grip portion 13, and the flexible sheath 11 is operated by sliding the needle base 14 with respect to the grip portion 13. The tip of the needle tube 12 can be protruded from the tip 11a.

したがって、可撓性シース１１を処置具挿通チャンネル２１内に挿脱する際には針管１２を可撓性シース１１の先端１１ａ内に没入させておき、図３に示されるように、可撓性シース１１の先端１１ａが処置具挿通チャンネル２１の先端から突出したら、針管１２を可撓性シース１１の先端１１ａから突出させて、針管１２の先端を生体組織に穿刺し、針元口金１４に注射筒等を接続して生体組織の吸引採取や薬液注射等を行うことができる。   Therefore, when inserting / removing the flexible sheath 11 into / from the treatment instrument insertion channel 21, the needle tube 12 is immersed in the distal end 11a of the flexible sheath 11, and as shown in FIG. When the distal end 11 a of the sheath 11 protrudes from the distal end of the treatment instrument insertion channel 21, the needle tube 12 is protruded from the distal end 11 a of the flexible sheath 11, the distal end of the needle tube 12 is punctured into the living tissue, and the needle base 14 is injected. A tube or the like can be connected to perform aspiration collection of a biological tissue, injection of a drug solution, or the like.

そのようにして超音波プローブ２３による超音波走査範囲３０内に突出された針管１２の先端部分は、生体組織の断層像等と共に超音波の反射エコー像として観察され、図示されていないモニタ画面にその像が描出される。   The distal end portion of the needle tube 12 thus projected into the ultrasonic scanning range 30 by the ultrasonic probe 23 is observed as a reflected echo image of an ultrasonic wave together with a tomographic image of a living tissue and is displayed on a monitor screen (not shown). The image is drawn.

図１は、そのような超音波内視鏡用穿刺針を構成する針管１２の第１の実施例の先端部分を拡大して示す斜視図、図２は側面断面図である。先端面が斜めに鋭くカットされた形状の針管１２の外径は例えば０．６〜０．８ｍｍ程度、肉厚は例えば０．１ｍｍ程度である。   FIG. 1 is an enlarged perspective view showing a distal end portion of a first embodiment of a needle tube 12 constituting such a puncture needle for an ultrasonic endoscope, and FIG. 2 is a side sectional view. The outer diameter of the needle tube 12 having a shape in which the distal end surface is cut obliquely sharply is, for example, about 0.6 to 0.8 mm, and the wall thickness is, for example, about 0.1 mm.

針管１２の先端付近の外周面には、超音波エコーの反射強度を増大させるための多数の（例えば３０〜２００個程度）の窪み１５が形成されている。この実施例では、窪み１５がいわゆる千鳥配列で配置されている。ただし、窪み１５を整列状態その他の配置にしても差し支えない。   A large number (for example, about 30 to 200) of recesses 15 for increasing the reflection intensity of the ultrasonic echo are formed on the outer peripheral surface near the tip of the needle tube 12. In this embodiment, the recesses 15 are arranged in a so-called staggered arrangement. However, the depressions 15 may be arranged or otherwise arranged.

各窪み１５は、針管１２の表面からその内側に向かって斜め後方向きに形成された超音波反射面１５Ａを備えている。窪み１５は略平面状に形成されており、各超音波反射面１５Ａが針管１２の軸線に対してなす角度θは略３０°〜６０°の範囲に設定されている。   Each recess 15 includes an ultrasonic reflection surface 15A formed obliquely rearward from the surface of the needle tube 12 toward the inside thereof. The recess 15 is formed in a substantially flat shape, and the angle θ formed by each ultrasonic reflection surface 15A with respect to the axis of the needle tube 12 is set in a range of approximately 30 ° to 60 °.

また、超音波反射面１５Ａの前方（即ち、超音波反射面１５Ａに対し垂直をなす方向の空間）が針管１２の壁肉で遮られないように、超音波反射面１５Ａの前方領域において針管１２の壁肉が削除され、それによって各窪み１５が形成されている。１５Ｂは、壁肉が削除された部分の壁面である。   Further, the needle tube 12 is disposed in the front region of the ultrasonic reflection surface 15A so that the front of the ultrasonic reflection surface 15A (that is, the space in the direction perpendicular to the ultrasonic reflection surface 15A) is not blocked by the wall of the needle tube 12. The wall meat is removed, so that each recess 15 is formed. 15B is the wall surface of the part from which the wall meat was deleted.

そのような窪み１５は、概念的に図２に二点鎖線で示されるように、針管１２の表面からの超音波反射面１５Ａの深さを半径とする程度のカッター５０を、軸線周りに回転させて針管１２の外表面に斜めに当て付けた場合に得られる形状と同様の形状に形成されている。   Such a recess 15 is formed by rotating a cutter 50 having a radius of the depth of the ultrasonic reflection surface 15A from the surface of the needle tube 12 around the axis as conceptually shown by a two-dot chain line in FIG. Thus, it is formed in the same shape as that obtained when it is obliquely applied to the outer surface of the needle tube 12.

窪み１５を針管１２に形成する加工方法としては、放電加工やレーザー加工等を用いることができるが、針管１２内に硬い芯金を通した状態で、針管１２の外側から機械的にかしめ加工する等の方法でも、多数の窪み１５を安価に形成することができる。   As a processing method for forming the recess 15 in the needle tube 12, electric discharge machining, laser processing, or the like can be used. However, mechanical caulking is performed from the outside of the needle tube 12 with a hard metal core passed through the needle tube 12. A number of depressions 15 can be formed at low cost also by such a method.

このような窪み１５が形成された針管１２を有する超音波内視鏡用穿刺針においては、図６に示されるように、針管１２が生体組織１００に対し突き刺された位置から針管１２の先端位置周辺に到る描出必要領域Ａで、窪み１５の超音波反射面１５Ａが超音波プローブ２３から発受信される超音波信号Ｕに対して垂直に近い向きになる。   In the ultrasonic endoscope puncture needle having the needle tube 12 in which such a depression 15 is formed, as shown in FIG. 6, the distal end position of the needle tube 12 from the position where the needle tube 12 is pierced into the living tissue 100. In the drawing required area A that reaches the periphery, the ultrasonic reflecting surface 15 </ b> A of the recess 15 is oriented almost perpendicular to the ultrasonic signal U transmitted and received from the ultrasonic probe 23.

その結果、生体組織１００に穿刺される針管１２の先端部分の超音波エコーを超音波反射面１５Ａで効果的に増大させ、描出必要領域Ａにおける針管１２の明瞭な超音波エコー画像を得ることができる。   As a result, it is possible to effectively increase the ultrasonic echo at the distal end portion of the needle tube 12 punctured into the living tissue 100 with the ultrasonic reflecting surface 15A, and to obtain a clear ultrasonic echo image of the needle tube 12 in the rendering required region A. it can.

なお、症例や医師の手技の相違等によって、超音波プローブ２３と針管１２と生体組織１００との相対的な位置関係は必ずしも一定ではない。そこで、超音波反射面１５Ａが針管１２の軸線に対してなす角度θが例えば３０°、４５°、６０°の三種類の針管１２を準備しておき、状況に応じてその中から最適のものを選択使用すれば、針管１２の明瞭な超音波エコー画像を常に得ることができる。   Note that the relative positional relationship among the ultrasonic probe 23, the needle tube 12, and the living tissue 100 is not necessarily constant due to differences in cases and doctor's procedures. Therefore, three types of needle tubes 12 having an angle θ formed by the ultrasonic reflecting surface 15A with respect to the axis of the needle tube 12 are prepared, for example, 30 °, 45 °, and 60 °, and the optimum one is selected according to the situation. If is selectively used, a clear ultrasonic echo image of the needle tube 12 can always be obtained.

図４は、超音波内視鏡用穿刺針を構成する針管１２の第２の実施例の先端部分を示しており、各窪み１５が針管１２の外周部に円周溝状に形成されている。円周溝の断面形状は、例えば頂角が９０°程度のＶ字状であり、そのＶ字状溝の前壁部が超音波反射面１５Ａ、後壁部が壁肉削除部の壁面１５Ｂになっている。超音波反射面１５Ａの向きは前述の第１の実施例と同様であり、第１の実施例と同様の作用効果を得ることができる。   FIG. 4 shows the distal end portion of the second embodiment of the needle tube 12 constituting the puncture needle for an ultrasonic endoscope, and each recess 15 is formed in a circumferential groove shape on the outer peripheral portion of the needle tube 12. . The cross-sectional shape of the circumferential groove is, for example, a V shape with an apex angle of about 90 °. It has become. The direction of the ultrasonic reflecting surface 15A is the same as that in the first embodiment, and the same effects as those in the first embodiment can be obtained.

図５は、超音波内視鏡用穿刺針を構成する針管１２の第３の実施例の先端部分を示しており、超音波反射面１５Ａが針管１２の軸線に対してなす角度θを、針管１２の先端に近い窪み１５ほど大きな角度にしたものである。   FIG. 5 shows the distal end portion of the third embodiment of the needle tube 12 constituting the puncture needle for an ultrasonic endoscope. The angle θ formed by the ultrasonic reflecting surface 15A with respect to the axis of the needle tube 12 is shown in FIG. The depression 15 closer to the tip of 12 has a larger angle.

具体的には、多数の窪み１５のうち後端に位置するものはθ＝３０°、先端に位置するものはθ＝６０°程度にして、その間の領域においてθを漸次変化させたものである。ただし、その他の態様であってもよい。   Specifically, among the many depressions 15, the one located at the rear end is set to θ = 30 °, the one located at the front end is set to about θ = 60 °, and θ is gradually changed in the region therebetween. . However, other modes may be used.

図６から明らかなように、針管１２の先端側ほど針管１２の軸線方向に対して超音波信号Ｕが斜め向きに当たる。したがって、第３の実施例のように構成することにより、各窪み１５の超音波反射面１５Ａに超音波信号Ｕが垂直又はそれに近い向きに当たって、全体の窪み１５において、バラツキなく強力な超音波エコーを得ることができる。   As is clear from FIG. 6, the ultrasonic signal U strikes obliquely with respect to the axial direction of the needle tube 12 toward the distal end side of the needle tube 12. Therefore, by configuring as in the third embodiment, the ultrasonic wave signal U hits the ultrasonic reflection surface 15A of each depression 15 in the vertical direction or a direction close thereto, so that the ultrasonic depressions that are strong in the whole depression 15 without any variation. Can be obtained.

１０ 超音波内視鏡用穿刺針
１１ 可撓性シース
１２ 針管
１５ 窪み
１５Ａ 超音波反射面
１５Ｂ 壁肉削除部の壁面
２０ 超音波内視鏡
２１ 処置具挿通チャンネル
２３ 超音波プローブ
θ 超音波反射面が針管の軸線に対してなす角度 DESCRIPTION OF SYMBOLS 10 Ultrasound endoscope puncture needle 11 Flexible sheath 12 Needle tube 15 Depression 15A Ultrasonic reflection surface 15B Wall surface of wall meat removal part 20 Ultrasound endoscope 21 Treatment instrument insertion channel 23 Ultrasonic probe θ Ultrasonic reflection surface Angle formed by the axis of the needle tube

Claims (6)

超音波内視鏡の処置具挿通チャンネルに挿脱される超音波内視鏡用穿刺針であって、生体組織に穿刺される針管を備え、上記針管の先端付近の外周面に、超音波エコーの反射強度を増大させるための複数の窪みが形成されたものにおいて、
上記各窪みが、上記針管の表面からその内側に向かって斜め後方向きに形成された超音波反射面を備えると共に、上記超音波反射面に対し垂直をなす方向の空間が上記針管の壁肉で遮られないように上記針管の壁肉が削除された状態に形成されていることを特徴とする超音波内視鏡用穿刺針。 A puncture needle for an ultrasonic endoscope that is inserted into and removed from a treatment instrument insertion channel of an ultrasonic endoscope, and includes a needle tube that is punctured into a living tissue, and an ultrasonic echo is provided on an outer peripheral surface near the tip of the needle tube. In a plurality of depressions for increasing the reflection intensity of
Each of the recesses includes an ultrasonic reflection surface formed obliquely rearward from the surface of the needle tube toward the inside thereof, and a space in a direction perpendicular to the ultrasonic reflection surface is a wall of the needle tube. A puncture needle for an ultrasonic endoscope, characterized in that the wall of the needle tube is removed so as not to be blocked. 上記各超音波反射面が、上記針管の軸線に対して略３０°〜６０°をなす範囲で斜め後方向きに形成されている請求項１記載の超音波内視鏡用穿刺針。   The puncture needle for an ultrasonic endoscope according to claim 1, wherein each of the ultrasonic reflection surfaces is formed obliquely rearward within a range of approximately 30 ° to 60 ° with respect to the axis of the needle tube. 上記各窪みが点状に形成されて、上記針管の外周部に千鳥配列又は整列状態に配置されている請求項１又は２記載の超音波内視鏡用穿刺針。   The puncture needle for an ultrasonic endoscope according to claim 1 or 2, wherein each of the depressions is formed in a dot shape and is arranged in a staggered arrangement or in an aligned state on an outer peripheral portion of the needle tube. 上記各窪みが、上記針管の外周部に円周溝状に形成されている請求項１又は２記載の超音波内視鏡用穿刺針。   The puncture needle for an ultrasonic endoscope according to claim 1 or 2, wherein each of the recesses is formed in a circumferential groove shape on an outer peripheral portion of the needle tube. 上記超音波反射面が上記針管の軸線に対してなす角度が、上記針管の先端に近い窪みほど大きな角度に形成されている請求項１ないし４のいずれかの項に記載の超音波内視鏡用穿刺針。   The ultrasonic endoscope according to any one of claims 1 to 4, wherein an angle formed by the ultrasonic reflection surface with respect to the axis of the needle tube is formed to be larger as a depression closer to the tip of the needle tube. Puncture needle. 上記針管が、可撓性シース内に軸線方向に進退自在に配置されている請求項１ないし５のいずれかの項に記載の超音波内視鏡用穿刺針。   The puncture needle for an ultrasonic endoscope according to any one of claims 1 to 5, wherein the needle tube is disposed in the flexible sheath so as to be movable back and forth in the axial direction.
JP2009040732A 2009-02-24 2009-02-24 Puncture needle for ultrasonic endoscope Pending JP2010194013A (en)

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WO2012105808A3 (en) * 2011-02-01 2012-11-29 Park Myoung Jin Structure of a needle for ultrasonically-guided intervention procedures
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US20170112464A1 (en) * 2015-10-26 2017-04-27 Smiths Medical Asd, Inc. Echogenic needle
US20170112528A1 (en) * 2015-10-26 2017-04-27 Smiths Medical International Limited Echogenic needle assemblies and method of use thereof
US20220175342A1 (en) * 2015-10-26 2022-06-09 Smiths Medical Asd, Inc. Echogenic needle
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