JPWO2018164264A1 - Hooks and snares for medical use - Google Patents

Hooks and snares for medical use Download PDF

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JPWO2018164264A1
JPWO2018164264A1 JP2019503869A JP2019503869A JPWO2018164264A1 JP WO2018164264 A1 JPWO2018164264 A1 JP WO2018164264A1 JP 2019503869 A JP2019503869 A JP 2019503869A JP 2019503869 A JP2019503869 A JP 2019503869A JP WO2018164264 A1 JPWO2018164264 A1 JP WO2018164264A1
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篤史 山田
篤史 山田
徹 谷
徹 谷
茂廣 森川
茂廣 森川
仲 成幸
成幸 仲
哲久 新田
哲久 新田
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/221Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32Surgical cutting instruments
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor

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Abstract

ループ形成部材の向きを変化させることができ、操作性の良い引っ掛け具及び医療用スネアを提供する。引っ掛け具10は、貫通する内孔11aを有する筒部材11と、筒部材11の内孔11aに挿通されるループ形成部材12とを備える。ループ形成部材12は、先端同士が繋がった第1、第2の片13、14を有しており、第1、第2の各片13、14の基端13b、14bは、それぞれ筒部材11の長さ方向Zに移動可能とされる。Provided are a hook and a medical snare that can change the direction of the loop forming member and have good operability. The hook 10 includes a tubular member 11 having an inner hole 11a therethrough, and a loop forming member 12 inserted into the inner hole 11a of the tubular member 11. The loop forming member 12 has first and second pieces 13 and 14 whose leading ends are connected to each other. The base ends 13b and 14b of the first and second pieces 13 and 14 are respectively connected to the cylindrical member 11. In the length direction Z.

Description

本発明は、引っ掛け具とその引っ掛け具が用いられた医療用スネアに関し、詳しくは、対象物を引っ掛けるループ形成部材のループの大きさや向きを変化させることが可能な引っ掛け具及び医療用スネアに関するものである。   The present invention relates to a hook and a medical snare using the hook, and more particularly, to a hook and a medical snare that can change the size and direction of a loop of a loop forming member that hooks an object. It is.

体腔内のポリープを切除するためや異物を除去するための医療用スネアとして、例えば特許文献1に記載のものが提案されている。特許文献1に記載のスネアは、内視鏡装置の細長の体腔挿入部に挿通されて使用されるものであり、可撓性を有する筒部材と、筒部材の内孔に挿入される操作ワイヤと、筒部材の内孔に挿入され筒部材の先端から出没させるスネアループとを備えている。スネアループは操作ワイヤの先端に接続されており、操作ワイヤを筒部材の内孔に沿って摺動させることでスネアループが筒部材の先端から出没する。スネアループは、筒部材から突出させるとループ状に膨らんだ状態となり、筒部材の内部に引き込むと、略直線状に窄まった状態となる。   As a medical snare for removing a polyp in a body cavity or removing a foreign substance, for example, the one described in Patent Document 1 has been proposed. The snare described in Patent Literature 1 is used by being inserted through an elongated body cavity insertion portion of an endoscope apparatus, and includes a flexible tubular member and an operation wire inserted into an inner hole of the tubular member. And a snare loop inserted into the inner hole of the tubular member and protruding and retracting from the tip of the tubular member. The snare loop is connected to the distal end of the operation wire, and the snare loop protrudes and retracts from the distal end of the cylindrical member by sliding the operation wire along the inner hole of the cylindrical member. When the snare loop protrudes from the cylindrical member, it becomes swelled in a loop shape, and when it is drawn into the cylindrical member, it becomes substantially linearly constricted.

特許文献1に記載のスネアを用いて体腔内のポリープを除去するには、まず、スネアループを筒部材の内孔に引き込んだ状態とし、筒部材を先端側から内視鏡装置の体腔挿入部に挿通する。そして、内視鏡装置の体腔挿入部を体内に挿入し、内視鏡装置の先端部に設けられた撮像素子による画像を見ながら内視鏡装置の先端部をポリープの近傍まで移動させる。ポリープの近傍への到達後、内視鏡装置の先端部からスネアの筒部材をポリープに向けて伸ばし、筒部材からスネアループを突出させてスネアループを所望の大きさに膨らんだ状態とする。そして、スネアループをポリープに引っ掛けて筒部材に引き込んでポリープを締め付け、最終的にポリープを体組織から切断する。   In order to remove a polyp in a body cavity using the snare described in Patent Document 1, first, a snare loop is pulled into an inner hole of a tube member, and the tube member is inserted into the body cavity insertion portion of the endoscope apparatus from the distal end side. Through. Then, the body cavity insertion section of the endoscope device is inserted into the body, and the distal end portion of the endoscope device is moved to the vicinity of the polyp while viewing an image obtained by the imaging element provided at the distal end portion of the endoscope device. After reaching the vicinity of the polyp, the snare tubular member is extended toward the polyp from the distal end portion of the endoscope apparatus, and the snare loop is projected from the tubular member so that the snare loop is expanded to a desired size. Then, the snare loop is hooked on the polyp and pulled into the tubular member to tighten the polyp, and finally the polyp is cut from the body tissue.

特開2011−5046号公報JP 2011-5046 A

特許文献1に記載の医療用スネアにおいては、スネアループが突出する方向は筒部材の長さ方向すなわち内視鏡装置の体腔挿入部の長さ方向であり、他の方向に突出させることはできない。このため、ポリープが例えば撮像素子による画像の右側位置に認められる場合には、内視鏡装置の体腔挿入部の先端部を右側に変位させることでスネアループを右側に向かせる必要がある。一方で、撮像素子は内視鏡装置の体腔挿入部の先端に固定されているので、内視鏡装置の体腔挿入部を右側へ変位させると、撮像素子も右側へ動き、撮像素子の視野が移動してしまうため、スネアループをポリープに引っ掛ける操作が行いにくいという問題があった。   In the medical snare described in Patent Literature 1, the direction in which the snare loop protrudes is the length direction of the cylindrical member, that is, the length direction of the body cavity insertion portion of the endoscope device, and cannot be protruded in other directions. . For this reason, when a polyp is recognized, for example, at the right position of the image obtained by the imaging device, it is necessary to displace the tip of the body cavity insertion section of the endoscope apparatus to the right to move the snare loop to the right. On the other hand, since the imaging device is fixed to the distal end of the body cavity insertion portion of the endoscope device, when the body cavity insertion portion of the endoscope device is displaced to the right, the imaging device also moves to the right, and the visual field of the imaging device is reduced. Because of the movement, there is a problem that the operation of hooking the snare loop on the polyp is difficult to perform.

また、図16(A)に示すように、スネアループ1がポリープ2の斜め上方向に位置する場合には、スネアループ1を斜め下方向へ伸ばしてポリープ2の奥側からスネアループ1を引っ掛けると、スネアループ1によりポリープ2を確実に捉え、引き込みやすい。しかし、特許文献1に記載の医療用スネアでは、スネアループ1が内視鏡装置3から突出する方向を変えることができない。このため、スネアループ1を内視鏡装置3及び筒部材4の長さ方向に突出させ(図16(B))、スネアループ1の先端に設けられた針を体組織5の壁面に押し付けてスネアループ1の先端を固定し、筒部材4を体組織5側へ撓ませている(図16(C))。このようにしてスネアループ1をポリープ2の手前側より引っ掛けるが、この操作では、ポリープ2の手前側からスネアループ1を引っ掛けることになり、スネアループ1を引き込むとポリープ2がスネアループにおさまりにくく、捉えにくかった。また、操作性が悪かった。   Also, as shown in FIG. 16A, when the snare loop 1 is located diagonally above the polyp 2, the snare loop 1 is extended diagonally downward and the snare loop 1 is hooked from the back side of the polyp 2. With the snare loop 1, the polyp 2 is reliably caught and easily pulled in. However, in the medical snare described in Patent Literature 1, the direction in which the snare loop 1 projects from the endoscope device 3 cannot be changed. For this reason, the snare loop 1 is made to protrude in the longitudinal direction of the endoscope device 3 and the cylindrical member 4 (FIG. 16B), and the needle provided at the tip of the snare loop 1 is pressed against the wall surface of the body tissue 5. The tip of the snare loop 1 is fixed, and the tubular member 4 is bent toward the body tissue 5 (FIG. 16C). In this manner, the snare loop 1 is hooked from the near side of the polyp 2, but in this operation, the snare loop 1 is hooked from the near side of the polyp 2. It was hard to catch. Also, the operability was poor.

本発明は前記問題に鑑みてなされたものであり、ループの形状や向きを容易に変化させることができることで、操作性に優れた引っ掛け具及び医療用スネアを提供することを課題としている。   The present invention has been made in view of the above-described problem, and has as its object to provide a hook and a medical snare having excellent operability by easily changing the shape and direction of a loop.

前記課題を解決するための本発明の引っ掛け具は、貫通する内孔を有する筒部材と、
前記筒部材の前記内孔に挿通されるループ形成部材とを備え、
前記ループ形成部材は、先端同士が繋がった第1、第2の片を有しており、前記第1、第2の各片の基端は、それぞれ前記筒部材の長さ方向に移動可能とされ、
前記第1、第2の各片の基端の双方を前記筒部材の長さ方向の一方側に移動させることで、前記第1、第2の各片の先端側を前記筒部材の先端から突出させて、当該突出した第1、第2の各片の先端側によって、前記筒部材の先端の位置から延びるループを形成でき、
前記第1の片の基端と第2の片の基端とのうち、一方を他方に対して前記筒部材の長さ方向に相対的に移動させることで、前記第1の片と前記第2の片とが向き合う方向に、前記ループの向きを変えることができ、
前記第1、第2の各片の基端の双方を前記筒部材の長さ方向の他方側に移動させることで、前記第1、第2の各片の先端側を記筒部材の内孔に引き込むことが可能である。
A hook of the present invention for solving the above-mentioned problems, a tubular member having an inner hole therethrough,
A loop forming member inserted into the inner hole of the cylindrical member,
The loop forming member has first and second pieces whose distal ends are connected to each other, and base ends of the first and second pieces are respectively movable in a length direction of the tubular member. And
By moving both the base ends of the first and second pieces to one side in the longitudinal direction of the cylindrical member, the distal ends of the first and second pieces are moved from the distal end of the cylindrical member. Projecting, a loop extending from the position of the tip of the tubular member can be formed by the tip end of each of the projecting first and second pieces;
By moving one of the base end of the first piece and the base end of the second piece relative to the other in the longitudinal direction of the cylindrical member, the first piece and the second piece are moved. The direction of the loop can be changed in a direction in which the two pieces face each other,
By moving both the base ends of the first and second pieces to the other side in the longitudinal direction of the tubular member, the distal ends of the first and second pieces are bored in the cylindrical member. It is possible to draw in.

好ましくは、前記第1、第2の片は、互いに向き合う方向への可撓性が互いに向き合う方向以外の方向への可撓性よりも大きい。   Preferably, the first and second pieces have greater flexibility in a direction facing each other than flexibility in a direction other than the direction facing each other.

好ましくは、前記ループ形成部材は、前記第1、第2の各片の長さ方向と直交する方向の断面形状において、前記互いに向き合う方向に沿う外形寸法が、前記互いに向き合う方向と直交する方向に沿う外形寸法より小さい形状である。   Preferably, in the cross-sectional shape in a direction perpendicular to the length direction of each of the first and second pieces, the loop forming member has an outer dimension along the direction facing each other in a direction perpendicular to the direction facing each other. It is a shape smaller than the external dimensions along.

また、前記ループ形成部材は、前記第1、第2の各片が別個の線材よりなり、各線材の先端部が接合されていてもよい。或いは、前記ループ形成部材は、1本の線材が折り曲げられたものであってもよい。   Further, in the loop forming member, each of the first and second pieces may be formed of a separate wire, and a tip portion of each wire may be joined. Alternatively, the loop forming member may be formed by bending a single wire.

好ましくは、前記第1の片の基端を前記第1の片の軸回りに回動させることや、前記第2の片の基端を前記第2の片の軸回りに回動させることが可能とされることで、前記ループの向きを、前記第1の片と前記第2の片とが向き合う方向と直交する方向や、前記筒部材の周方向に変えることができる。   Preferably, the base of the first piece is rotated around the axis of the first piece, and the base of the second piece is rotated about the axis of the second piece. By being made possible, the direction of the loop can be changed to a direction orthogonal to a direction in which the first piece and the second piece face each other, or a circumferential direction of the tubular member.

好ましくは、前記第1の片や前記第2の片は、トルクコイルから構成されている。さらに好ましくは、前記第1の片や前記第2の片は、外層のトルクコイルの内面が内層のトルクコイルの外面に密着し、且つ、外層のトルクコイルの巻方向と内層のトルクコイルの巻方向とが逆である多条多層コイルから構成されている。   Preferably, the first piece and the second piece are constituted by torque coils. More preferably, in the first and second pieces, the inner surface of the outer layer torque coil is in close contact with the outer surface of the inner layer torque coil, and the winding direction of the outer layer torque coil and the winding of the inner layer torque coil are different. It is composed of a multi-layered multilayer coil whose direction is opposite.

また好ましくは、本発明の引っ掛け具は、径方向に変形可能である中空のガイド部と、前記ガイド部内に長さ方向に沿って移動自在に挿入される可動片とを有する屈曲・伸展装置をさらに備え、
前記可動片は、前記ガイド部の長さ方向に沿って延び、互いに向き合う方向へ可撓性を有する第1、第2の帯状の可撓片と、前記第1、第2の可撓片の先端同士をつなぐ接続片とを含み、前記接続片及び前記ガイド部の端面に前記筒部材を通すための貫通孔が形成されている。
Also preferably, the hooking device of the present invention is a bending / extending device having a hollow guide portion that can be deformed in a radial direction and a movable piece that is movably inserted into the guide portion along the length direction. In addition,
The movable piece extends along a length direction of the guide portion and has first and second strip-shaped flexible pieces having flexibility in directions facing each other. A through hole for passing the cylindrical member is formed in the connection piece and the end face of the guide portion.

また本発明の医療用スネアは、前記引っ掛け具と、
前記引っ掛け具の第1の片の基端部に連繋される第1の操作部と、前記引っ掛け具の第2の片の基端部に連繋される第2の操作部とを備える。
Further, the medical snare of the present invention, the hook,
The hook includes a first operation unit connected to a base end of a first piece of the hook, and a second operation unit connected to a base end of a second piece of the hook.

好ましくは、本発明の医療用スネアは、前記第1、第2の各操作部を前記筒部材の長さ方向に沿って摺動自由に支持する操作本体部をさらに備える。   Preferably, the medical snare of the present invention further includes an operation main body that supports the first and second operation portions so as to slide freely along the length direction of the tubular member.

本発明の引っ掛け具及び医療用スネアによれば、ループの形状や向きを変化させることができることで、操作性に優れる。   ADVANTAGE OF THE INVENTION According to the hook and medical snare of this invention, since the shape and direction of a loop can be changed, it is excellent in operability.

本発明の一実施形態に係る医療用スネアの全体構成を示す斜視図である。It is a perspective view showing the whole medical snare composition concerning one embodiment of the present invention. ループが形成された状態の医療用スネアの断面図である。It is sectional drawing of the medical snare in the state in which the loop was formed. ループ形成部材が筒部材に引き込まれた状態の医療用スネアの断面図である。It is sectional drawing of the medical snare in the state where the loop formation member was retracted in the cylindrical member. (A)は図2のA−A線に沿う断面図であり、(B)は第1の片の断面にX軸、Y軸を重ねた図、(C)は第2の片の断面にX軸、Y軸を重ねた図である。2A is a cross-sectional view taken along line AA in FIG. 2, FIG. 2B is a view in which the X axis and the Y axis are superimposed on a cross section of the first piece, and FIG. It is the figure which superimposed the X axis and the Y axis. 筒部材及び第1、第2の片の変形例を示す断面図である。It is sectional drawing which shows the modification of a cylindrical member and a 1st, 2nd piece. ループ形成部材の向き及び形状の変化を説明するための原理説明図であり、(A)は第1の片の基端を筒部材の長さ方向の一方側に移動させた状態の図、(B)は第1の片の基端を筒部材の長さ方向の他方側に移動させた状態の図である。It is a principle explanatory view for explaining change of the direction and shape of the loop forming member, (A) is a diagram showing a state in which the base end of the first piece is moved to one side in the length direction of the tubular member, FIG. 6B is a diagram showing a state in which the base end of the first piece has been moved to the other side in the length direction of the tubular member. 他の実施形態のループ形成部材の向きの変化を説明するための原理説明図であり、(A)は第1、第2の片の基端が揃っている状態の図、(B)、(C)、(D)は第1の片の基端を筒部材の長さ方向の一方側に摺動させた状態の図である。It is principle explanatory drawing for demonstrating the change of the direction of the loop forming member of other embodiment, (A) is a figure in which the base end of a 1st, 2nd piece is aligned, (B), ( (C), (D) is a diagram of a state in which the base end of the first piece is slid to one side in the length direction of the tubular member. 本発明の他の実施形態に係る引っ掛け具においてループ形成部材の向きの変化を説明するための原理説明図であり、(A)は引っ掛け具の断面図、(B)は引っ掛け具の側面図である。It is principle explanatory drawing for demonstrating the change of the direction of a loop forming member in the hooking device which concerns on other embodiment of this invention, (A) is sectional drawing of a hooking device, (B) is a side view of a hooking device. is there. 本発明の他の実施形態に係る引っ掛け具においてループ形成部材の向きの変化を説明するための原理説明図であり、(A)は引っ掛け具の断面図、(B)は引っ掛け具の側面図である。It is principle explanatory drawing for demonstrating the change of the direction of a loop forming member in the hooking device which concerns on other embodiment of this invention, (A) is sectional drawing of a hooking device, (B) is a side view of a hooking device. is there. 本発明の他の実施形態に係る引っ掛け具においてループ形成部材の向きの変化を説明するための原理説明図であり、(A)は引っ掛け具の断面図、(B)は引っ掛け具の平面図である。It is principle explanatory drawing for demonstrating the change of the direction of a loop formation member in the hooking device which concerns on other embodiment of this invention, (A) is sectional drawing of a hooking device, (B) is a top view of a hooking device. is there. 本発明の他の実施形態に係る引っ掛け具においてループ形成部材の向きの変化を説明するための原理説明図であり、(A)は引っ掛け具の断面図、(B)は引っ掛け具の平面図である。It is principle explanatory drawing for demonstrating the change of the direction of a loop formation member in the hooking device which concerns on other embodiment of this invention, (A) is sectional drawing of a hooking device, (B) is a top view of a hooking device. is there. 本発明の他の実施形態に係る引っ掛け具を示す図であり、(A)は引っ掛け具の断面図、(B)は第1の片及び第2の片を示す平面図である。It is a figure which shows the hook which concerns on other embodiment of this invention, (A) is sectional drawing of a hook, (B) is a top view which shows a 1st piece and a 2nd piece. 屈曲・伸展装置が付加された引っ掛け具を示す斜視図である。It is a perspective view which shows the hook which added the bending / extension apparatus. 屈曲・伸展装置の方向の変化を説明するための原理説明図であり、(A)は第1の可撓片の基端が第2の可撓片の基端よりも長さ方向の基端側としたときの図、(B)は先端側としたときの図である。It is principle explanatory drawing for demonstrating the change of the direction of a bending / extension apparatus, (A) is the base end of the length direction of the base of a 1st flexible piece longer than the base end of a 2nd flexible piece. (B) is a diagram when it is set to the front end side. 筒部材を撓ませた状態を示す説明図である。It is explanatory drawing which shows the state which bent the cylindrical member . 従来技術のスネアを用いたポリープの除去プロセスを模式的に示す説明図である。It is explanatory drawing which shows typically the removal process of the polyp using the snare of a prior art.

本発明の実施形態を図面を参照して説明する。
図1〜図6は本発明の引っ掛け具10が用いられた医療用スネア20の一実施形態を示す。医療用スネア20は、内視鏡装置(図示せず)の体腔挿入部に挿通されるものである。なお、本発明の引っ掛け具10は、手術の妨げとなる臓器を圧排、牽引して術野を確保するためのレトラクターとして用いることや、血管内に存在する除去対象物(例えばカテーテルの破片)を除去するスネアとしても使用できる。また、医療用途であっても、必ずしも内視鏡装置に付加されて用いられるものに限定されるものではない。
An embodiment of the present invention will be described with reference to the drawings.
1 to 6 show one embodiment of a medical snare 20 using the hook 10 of the present invention. The medical snare 20 is inserted through a body cavity insertion portion of an endoscope device (not shown). The hook 10 of the present invention can be used as a retractor to secure an operation field by excluding and towing an organ that hinders an operation, or an object to be removed (for example, a fragment of a catheter) existing in a blood vessel. It can also be used as a snare for removing. Further, even for medical use, the present invention is not necessarily limited to those used in addition to the endoscope apparatus.

医療用スネア20は、引っ掛け具10と、操作本体部21と、操作本体部21に個別に摺動自由に支持される第1、第2の操作部22、23とを備えている。   The medical snare 20 includes the hook 10, an operation main body 21, and first and second operation units 22 and 23 that are individually slidably supported by the operation main body 21.

図1、図2に示すように、引っ掛け具10は、貫通する内孔11aを有する筒部材11と、筒部材11の内孔11aに挿通されるループ形成部材12とからなる。   As shown in FIGS. 1 and 2, the hook 10 includes a cylindrical member 11 having an inner hole 11 a therethrough, and a loop forming member 12 inserted into the inner hole 11 a of the cylindrical member 11.

筒部材11は、内孔11aの長さ方向に直交する方向の断面形状が円形である(すなわち、筒部材11は円筒体である)。筒部材11は、例えばβチタンやニッケルチタンなどの弾性を有する金属あるいは合金や、樹脂製の材料、ゴムなどで形成されており、径方向への可撓性を有している。内孔11aの先端の開口部や、内孔11aの後端の開口部には、それぞれ、支持部材11bが設けられる(図2)。   The cylindrical member 11 has a circular cross section in a direction perpendicular to the length direction of the inner hole 11a (that is, the cylindrical member 11 is a cylindrical body). The tubular member 11 is formed of a metal or alloy having elasticity such as β-titanium or nickel-titanium, a resin material, rubber, or the like, and has flexibility in a radial direction. A support member 11b is provided in each of the opening at the front end of the inner hole 11a and the opening at the rear end of the inner hole 11a (FIG. 2).

ループ形成部材12は、ワイヤである第1片13及び第2片14を有している。第1の片13や第2の片14は、例えばニッケルチタン(ニチノール)やベータチタンなどの超弾性金属材料からなり、可撓性を有している。第1片13の先端部と第2片14の先端部とは繋がっており、当該繋がった第1片13及び第2片14の先端部によって、ループ形成部材12の先端部12aが構成される。第1の片13や第2の片14は、筒部材11の内孔11aに挿通されて、筒部材11の支持部材11bに摺動自由に支持される。第1の片13の基端側や、第2の片14の基端側は、筒部材11の内孔11aから延び出される。なお、支持部材11bは、必ずしも必要ではなく、省略されてもよい。   The loop forming member 12 has a first piece 13 and a second piece 14 which are wires. The first piece 13 and the second piece 14 are made of a superelastic metal material such as nickel titanium (Nitinol) or beta titanium, and have flexibility. The tip of the first piece 13 and the tip of the second piece 14 are connected, and the connected tips of the first piece 13 and the second piece 14 constitute the tip 12 a of the loop forming member 12. . The first piece 13 and the second piece 14 are inserted into the inner hole 11 a of the tubular member 11 and are slidably supported by the support member 11 b of the tubular member 11. The proximal end of the first piece 13 and the proximal end of the second piece 14 extend from the inner hole 11 a of the tubular member 11. Note that the support member 11b is not always necessary and may be omitted.

本実施形態では、第1、第2の各片13,14が別個の線材よりなり、第1片13を構成する線材の先端部と、第2片14を構成する線材の先端部とが接合されていることで、ループ形成部材12が形成されている。ループ形成部材12の先端部12aには針12bが取り付けられており、当該針12bによって第1、第2の各片13、14の先端部同士が接合されている。針12bは、ループ形成部材12の先端をポリープ近傍の体組織の壁面に固定するためのものであり、この針12bを用いることで、ポリープにループ形成部材12が引っ掛けやすくなる。   In the present embodiment, each of the first and second pieces 13 and 14 is formed of a separate wire, and the tip of the wire forming the first piece 13 and the tip of the wire forming the second piece 14 are joined. As a result, the loop forming member 12 is formed. A needle 12b is attached to the tip 12a of the loop forming member 12, and the tips of the first and second pieces 13, 14 are joined to each other by the needle 12b. The needle 12b is for fixing the distal end of the loop forming member 12 to the wall of the body tissue near the polyp. By using the needle 12b, the loop forming member 12 is easily hooked on the polyp.

なお、針12bを省略して、第1、第2の各片13、14の先端部を直接接合してもよい。   Note that the needles 12b may be omitted and the distal ends of the first and second pieces 13 and 14 may be directly joined.

また、ループ形成部材12は、1本の線材が折り曲げられたものであってもよい。この場合、ループ形成部材12は、線材の折り曲げ位置によって先端部12aが構成されたものとなる。そして当該先端部12aと一方の基端13bとの間の線材の範囲によって第1の片13が構成され、上記先端部12aと他方の基端13bとの間の線材の範囲によって第2の片13が構成される。   Further, the loop forming member 12 may be formed by bending one wire. In this case, the loop forming member 12 has the distal end portion 12a formed by the bending position of the wire. The first piece 13 is constituted by the range of the wire between the tip 12a and the one base 13b, and the second piece is formed by the range of the wire between the tip 12a and the other base 13b. 13 is configured.

操作本体部21は、筒状を呈しており、操作本体部21の内径は、筒部材11の外径と同等とされる。操作本体部21は、その先端が筒部材11の基端に連結されて、筒部材11の長さ方向に延びるものとされる。操作本体部21の内部には、第1の片13の基端側や第2の片14の基端側が挿入される。第1の操作部22は、第1の片13の基端13bに連繋され、第2の操作部23は、第2の片14の基端14bに連繋される。   The operation main body 21 has a tubular shape, and the inner diameter of the operation main body 21 is equal to the outer diameter of the cylindrical member 11. The operation main body 21 has a distal end connected to the base end of the tubular member 11 and extends in the longitudinal direction of the tubular member 11. The base end of the first piece 13 and the base end of the second piece 14 are inserted into the operation main body 21. The first operation unit 22 is connected to a base end 13 b of the first piece 13, and the second operation unit 23 is connected to a base end 14 b of the second piece 14.

操作本体部21の側壁には、摺動溝Mが形成される。摺動溝Mは、筒部材11の長さ方向Zに延びるものであり、第1、第2の操作部22、23は、それぞれ、摺動溝Mに通されて、操作本体部21の外側に延び出される。   A sliding groove M is formed on the side wall of the operation main body 21. The sliding groove M extends in the length direction Z of the cylindrical member 11, and the first and second operating portions 22 and 23 are respectively passed through the sliding groove M and are provided outside the operating body 21. Is extended.

ユーザは、第1、第2の操作部22、23を摺動溝Mに沿って筒部材11の長さ方向Zの一方側(図2の左側)に摺動させることで、第1の片13や第2の片14の基端13b,14bを、筒部材11の長さ方向Zの一方側(図2の左側)に移動させることができる。また、ユーザは、第1、第2の操作部22、23を摺動溝Mに沿って筒部材11の長さ方向Zの他方側(図2の右側)に摺動させることで、第1の片13や第2の片14の基端13b,14bを、筒部材11の長さ方向Zの他方側(図2の右側)に移動させることができる。なお、「第1の片13や第2の片14の基端13b,14bを、筒部材11の長さ方向Zの一方側に移動させる」とは、「基端13b,14bを筒部材11に近づけること」に相当し、「第1の片13や第2の片14の基端13b,14bを、筒部材11の長さ方向Zの他方側に移動させる」とは、「基端13b,14bを筒部材11から遠ざけること」に相当する。また図示の例では、第1の操作部22が、第1の片13の長さ方向と略直交する方向に延びる環状体とされ、第2の操作部23が、第2の片14の長さ方向と略直交する方向に延びる環状体とされているが、第1の操作部22や第2の操作部23の構造は、図示例に限定されない。すなわち、第1の操作部22や第2の操作部23の構造は、ユーザが把持することで、第1の片13や第2の片14を長さ方向Zに移動させることの可能な様々な構造とされ得る。   The user slides the first and second operation units 22 and 23 along the sliding groove M to one side (the left side in FIG. 2) in the length direction Z of the cylindrical member 11, thereby forming the first piece. The base 13 and the base ends 13b and 14b of the second piece 14 can be moved to one side (the left side in FIG. 2) in the length direction Z of the tubular member 11. In addition, the user slides the first and second operation units 22 and 23 along the sliding groove M to the other side (the right side in FIG. 2) in the length direction Z of the tubular member 11, thereby performing the first operation. The base ends 13b and 14b of the piece 13 and the second piece 14 can be moved to the other side (the right side in FIG. 2) in the longitudinal direction Z of the tubular member 11. Note that “to move the base ends 13b and 14b of the first piece 13 and the second piece 14 to one side in the length direction Z of the cylindrical member 11” means “to move the base ends 13b and 14b to the cylindrical member 11”. "Move the base ends 13b and 14b of the first piece 13 and the second piece 14 to the other side in the length direction Z of the tubular member 11". , 14b away from the cylindrical member 11 ". In the illustrated example, the first operating section 22 is an annular body extending in a direction substantially perpendicular to the length direction of the first piece 13, and the second operating section 23 is Although the annular body extends in a direction substantially perpendicular to the vertical direction, the structures of the first operation unit 22 and the second operation unit 23 are not limited to the illustrated example. In other words, the structures of the first operation unit 22 and the second operation unit 23 can be variously configured so that the first piece 13 and the second piece 14 can be moved in the length direction Z by being gripped by the user. Structure.

そして本実施形態では、第1、第2の操作部22,23に対する操作で、第1の片13や第2の片14の基端13b,14bの双方を筒部材11の長さ方向Zの一方側に移動させることで、図2に示すように、第1、第2の各片13、14の先端側を筒部材11の先端から突出させて、当該突出した第1、第2の各片13、14の先端側によって、筒部材11の先端の位置から延びるループPを形成することができる。   In the present embodiment, by operating the first and second operation portions 22 and 23, both the base ends 13b and 14b of the first piece 13 and the second piece 14 are moved in the length direction Z of the cylindrical member 11. By moving to one side, as shown in FIG. 2, the distal ends of the first and second pieces 13 and 14 are made to protrude from the distal end of the cylindrical member 11, and the protruding first and second A loop P extending from the position of the distal end of the tubular member 11 can be formed by the distal ends of the pieces 13 and 14.

また本実施形態では、第1、第2の片13、14に形状記憶が施されていることで、筒部材11から突出した第2の各片13、14の先端側は、膨らんで、幅が数センチメートル程度のループPを形成するものとなる。つまり、第1、第2の各片13、14の先端側を筒部材11から突出させると、第1、第2の各片13、14の先端側は、筒部材11による外力が加えられないものとなるが、本実施形態の引っ掛け具10では、第1、第2の各片13、14の先端側が、外力の解放に伴う弾性復帰によって膨らんで、幅が数センチメートル程度のループPを形成するものとなるように、第1、第2の片13、14に形状記憶が施されている。なお上記の「膨らむ」とは、第1の片13と第2の片14とが向き合う方向Xにおいて、第1の片13と第2の片14との間の間隔が大きくなることを意味する。   Further, in the present embodiment, the shape memory is given to the first and second pieces 13 and 14, so that the distal ends of the second pieces 13 and 14 protruding from the tubular member 11 swell and have a width. Form a loop P of about several centimeters. That is, when the distal ends of the first and second pieces 13 and 14 are made to protrude from the cylindrical member 11, no external force by the cylindrical member 11 is applied to the distal ends of the first and second pieces 13 and 14. However, in the hook 10 of the present embodiment, the distal ends of the first and second pieces 13 and 14 are expanded by elastic return accompanying the release of the external force to form a loop P having a width of about several centimeters. Shape memory is applied to the first and second pieces 13 and 14 so as to be formed. Note that the term “swell” means that the distance between the first piece 13 and the second piece 14 increases in the direction X in which the first piece 13 and the second piece 14 face each other. .

また本実施形態では、第1、第2の操作部22,23に対する操作で、第1、第2の各片13、14が筒部材11の先端から突出する長さを変えることで、ループPの形状を変化させることができる。つまり、第1、第2の操作部22、23を筒部材11の長さ方向Zの一方側に摺動させて、第1、第2の各片13、14が筒部材11の先端から突出する長さを大きくすれば、ループPを大きくすることができる。また第1、第2の操作部22、23を筒部材11の長さ方向Zの他方側に摺動させて、第1、第2の各片13、14が筒部材11の先端から突出する長さを小さくすれば、ループPを小さくすることができる。   Further, in the present embodiment, the length of the first and second pieces 13 and 14 protruding from the distal end of the tubular member 11 is changed by an operation on the first and second operation portions 22 and 23, so that the loop P Can be changed. That is, the first and second operating portions 22 and 23 are slid to one side in the length direction Z of the cylindrical member 11 so that the first and second pieces 13 and 14 protrude from the distal end of the cylindrical member 11. If the length of the loop P is increased, the loop P can be increased. Further, the first and second operating portions 22 and 23 are slid to the other side in the longitudinal direction Z of the cylindrical member 11 so that the first and second pieces 13 and 14 protrude from the distal end of the cylindrical member 11. If the length is reduced, the loop P can be reduced.

さらに本実施形態では、第1、第2の操作部22,23に対する操作で、第1の片13や第2の片14の基端13b,14bの双方を筒部材11の長さ方向Zの他方側に移動させることで、図3に示すように、第1、第2の片13、14の先端側を筒部材11の内孔に引き込むことが可能である。この際には、第1、第2の各片13、14の先端側に、筒部材11による内向きの外力が加わることで、第1、第2の各片13、14の先端側は、互いに接近するように弾性変形して閉じた状態となる。   Further, in the present embodiment, by operating the first and second operating portions 22 and 23, both the base ends 13b and 14b of the first piece 13 and the second piece 14 are moved in the length direction Z of the tubular member 11. By moving to the other side, as shown in FIG. 3, the distal ends of the first and second pieces 13 and 14 can be drawn into the inner hole of the tubular member 11. At this time, the inward external force of the cylindrical member 11 is applied to the distal ends of the first and second pieces 13 and 14, so that the distal ends of the first and second pieces 13 and 14 are It is elastically deformed so as to approach each other and becomes a closed state.

上記の弾性復帰や弾性変形が生じ得る第1、第2の片13、14の範囲を長くするために、第1、第2の片13、14の全長を超弾性金属材料から形成することが好ましいが、材料費を安価に抑える観点から、第1、第2の片13、14の先端側部分のみを超弾性金属材料で構成し、その他の基端側部分は超弾性金属材料以外の材料から構成してもよい。   In order to lengthen the range of the first and second pieces 13 and 14 where the above-mentioned elastic return and elastic deformation may occur, the entire length of the first and second pieces 13 and 14 may be formed from a superelastic metal material. Although preferred, from the viewpoint of reducing the material cost, only the distal end portions of the first and second pieces 13 and 14 are made of a superelastic metal material, and the other base end portions are made of a material other than the superelastic metal material May be configured.

第1、第2の各片13、14は、図4(A)に示すように、長さ方向と直交する方向の断面形状が半円形であって、平坦な面13a、14aを内側にして線対称に配置されている。第1、第2の各片13、14は互いに向き合う方向Xへの可撓性が、互いに向き合う方向以外の方向への可撓性よりも大きく、第1、第2の各片13、14の前記断面形状において、第1、第2の各片13、14が互いに向き合う方向Xに沿う外形寸法L2は、向き合う方向Xと直交する方向Yに沿う外形寸法L1より小さな形状に設定されている。すなわち、第1、第2の各片13、14の向き合う方向Xを横方向と定義し、方向Yを縦方向と定義した場合には、前記断面形状はいわゆる縦長形状となっている。このような断面形状においては、第1、第2の各片13、14は、Y軸周りの断面二次モーメントがX軸周りの断面二次モーメントよりも小さく、方向Xに曲がりやすい。図4(B)、図4(C)は、第1、第2の各片13、14の前記断面にX軸、Y軸を重ねた図である。図4(B)に示すX軸は、「X方向に延びて、第1の片13の横断面の図心を通過する軸」に相当する。図4(C)に示すX軸は、、「X方向に延びて、第2の片14の横断面の図心を通過する軸」に相当する。図4(B)に示すY軸は、「Y方向に延びて、第1の片13の横断面の図心を通過する軸」に相当する。図4(C)に示すY軸は、「Y方向に延びて、第2の片14の横断面の図心を通過する軸」に相当する。   As shown in FIG. 4A, each of the first and second pieces 13 and 14 has a semicircular cross-sectional shape in a direction orthogonal to the length direction, with the flat surfaces 13a and 14a inside. They are arranged symmetrically. The first and second pieces 13 and 14 have greater flexibility in the direction X facing each other than the flexibility in directions other than the direction facing each other, and the first and second pieces 13 and 14 In the cross-sectional shape, the outer dimension L2 along the direction X in which the first and second pieces 13, 14 face each other is set to be smaller than the outer dimension L1 along the direction Y orthogonal to the facing direction X. That is, when the direction X in which the first and second pieces 13 and 14 face each other is defined as a horizontal direction and the direction Y is defined as a vertical direction, the cross-sectional shape is a so-called vertically long shape. In such a cross-sectional shape, each of the first and second pieces 13 and 14 has a smaller secondary moment of area around the Y axis than the secondary moment of area around the X axis, and is easily bent in the direction X. FIGS. 4B and 4C are diagrams in which the X-axis and the Y-axis are superimposed on the cross section of each of the first and second pieces 13 and 14. The X axis shown in FIG. 4B corresponds to “an axis extending in the X direction and passing through the centroid of the cross section of the first piece 13”. The X axis shown in FIG. 4C corresponds to “an axis that extends in the X direction and passes through the centroid of the cross section of the second piece 14”. The Y axis shown in FIG. 4B corresponds to “an axis extending in the Y direction and passing through the centroid of the cross section of the first piece 13”. The Y axis shown in FIG. 4C corresponds to “an axis extending in the Y direction and passing through the centroid of the cross section of the second piece 14”.

なお、第1、第2の各片13、14の前記断面形状は、図4に示す半円形に限られない。例えば図5(A)〜図5(C)に示すように、第1、第2の各片13、14の断面形状を、長方形、三角形、楕円形にすることで、第1、第2の各片13、14が互いに向き合う方向Xに沿う外形寸法L2を、向き合う方向Xと直交する方向Yに沿う外形寸法L1より小さくしてもよい。さらに、本実施形態では、第1、第2の各片13、14の前記断面形状において、平坦な面が向き合っているが、第1、第2の各片13、14の向き合う面を、曲面にしてもよい。また、第1、第2の各片13、14の各断面形状は、正方形や長方形や矩形以外の多角形(五角形や六角形など)や楕円や円を二等分した線対称の形状であってもよい。さらに、第1、第2の各片13、14の前記断面形状の大きさは、両方の片13、14が筒部材11の内孔11a内を移動可能であれば任意の大きさでよい。   The cross-sectional shape of each of the first and second pieces 13 and 14 is not limited to the semicircle shown in FIG. For example, as shown in FIGS. 5 (A) to 5 (C), the first and second pieces 13 and 14 are formed into rectangular, triangular, and elliptical cross-sectional shapes, so that the first and second pieces 13 and 14 have the same shape. The outer dimension L2 along the direction X in which the pieces 13 and 14 face each other may be smaller than the outer dimension L1 along the direction Y orthogonal to the facing direction X. Furthermore, in the present embodiment, in the cross-sectional shape of the first and second pieces 13 and 14, flat surfaces face each other, but the faces where the first and second pieces 13 and 14 face each other are curved surfaces. It may be. Further, the cross-sectional shape of each of the first and second pieces 13 and 14 is a line-symmetric shape obtained by bisecting a polygon such as a square, a rectangle, or a rectangle (a pentagon or a hexagon), an ellipse, or a circle. You may. Furthermore, the size of the cross-sectional shape of each of the first and second pieces 13 and 14 may be any size as long as both pieces 13 and 14 can move in the inner hole 11 a of the tubular member 11.

また、筒部材11の長さ方向に直交する方向の断面に現れる内孔11aの形状は円形に限られるものではなく、長方形、三角形、楕円形等、任意の形状であってもよい。
例えば、内孔11aの形状は、筒部材11の内孔11aの内面と第1、第2の各片13、14の外面との間の間隔が一定になるような形状であってもよい。図5(D)においては、第1、第2の各片13、14を合わせた外形15は略長方形であり、筒部材11の内孔11aの形状は、第1、第2の各片13、14の外形15に沿う略長方形である。図5(E)においては、第1、第2の各片13、14の外形15が略正方形であり、筒部材11の内孔11aの形状は、第1、第2の各片13、14の外形15に沿う略正方形である。
Further, the shape of the inner hole 11a that appears in a cross section in a direction orthogonal to the length direction of the tubular member 11 is not limited to a circle, but may be an arbitrary shape such as a rectangle, a triangle, an ellipse, and the like.
For example, the shape of the inner hole 11a may be such that the distance between the inner surface of the inner hole 11a of the cylindrical member 11 and the outer surfaces of the first and second pieces 13, 14 is constant. In FIG. 5D, the outer shape 15 including the first and second pieces 13 and 14 is substantially rectangular, and the shape of the inner hole 11 a of the cylindrical member 11 is the first and second pieces 13. , 14 are substantially rectangular along the outer shape 15. In FIG. 5E, the outer shape 15 of each of the first and second pieces 13 and 14 is substantially square, and the shape of the inner hole 11a of the cylindrical member 11 is the first and second pieces 13 and 14. Is a substantially square shape along the outer shape 15.

このように、筒部材11の内孔11aの内面と第1、第2の各片13、14の外面との間の間隔を一定にすると、筒部材11の内孔11aの内面と第1、第2の各片13、14の外面との間の空間に無駄が生じないため、両方の片13、14が筒部材11の内孔11a内を移動する際に、筒部材11の内孔11a内で第1、第2の各片13、14が振れてがたつくことがなく、安定して第1、第2の各片13、14を移動させることができる。また、筒部材11の内孔11aの内面と第1、第2の各片13、14の外面との間の間隔が一定でない場合には、筒部材11の内孔11aの内面と近い第1、第2の各片13、14の頂点や面が筒部材11の内孔11aの内面に当たり易くなるが、前記間隔を一定とすることで、これを防ぐことができる。   As described above, when the distance between the inner surface of the inner hole 11a of the cylindrical member 11 and the outer surfaces of the first and second pieces 13 and 14 is made constant, the inner surface of the inner hole 11a of the cylindrical member 11 and the first and Since there is no waste in the space between the outer surfaces of the second pieces 13 and 14, when the two pieces 13 and 14 move in the inner hole 11a of the cylindrical member 11, the inner hole 11a of the cylindrical member 11 is moved. The first and second pieces 13 and 14 can be stably moved without swinging and rattling of the first and second pieces 13 and 14 therein. When the distance between the inner surface of the inner hole 11a of the cylindrical member 11 and the outer surfaces of the first and second pieces 13 and 14 is not constant, the first close to the inner surface of the inner hole 11a of the cylindrical member 11 is formed. The vertices and surfaces of the second pieces 13 and 14 can easily hit the inner surface of the inner hole 11a of the tubular member 11, but this can be prevented by keeping the interval constant.

また、第1、第2の各片13、14は、前記断面形状が異なっていてもよく、相似形であってもよい。また、第1、第2の各片13、14は、記憶されている形状が異なっていてもよく、例えば、第1の片13の記憶する形状が直線状であり、第2の片14の記憶する形状が曲線状であってもよい。さらに、第1、第2の各片13、14は構成される素材が異なっていてもよい。また、第1、第2の各片13、14の長さが異なっていてもよい。以上のようにすることで、ループPの形状にバリエーションを持たせることが可能になり、治療部位に応じたカスタマイズが可能となる。   Further, the first and second pieces 13 and 14 may have different cross-sectional shapes or may have similar shapes. Further, the first and second pieces 13 and 14 may have different stored shapes. For example, the shape stored in the first piece 13 is linear, and the stored shape of the second piece 14 may be different. The shape to be stored may be a curved shape. Further, the first and second pieces 13 and 14 may be made of different materials. Further, the lengths of the first and second pieces 13 and 14 may be different. By doing as described above, the shape of the loop P can be varied, and customization according to the treatment site can be performed.

また本実施形態では、第1の片13の基端13bと第2の片14の基端14bとのうち、一方を他方に対して筒部材11の長さ方向Zに相対的に移動させることで、第1、第2の各片13、14が向き合う方向Xに、ループPの向きを変えることができる。以下、具体的に説明する。   In this embodiment, one of the base end 13b of the first piece 13 and the base end 14b of the second piece 14 is relatively moved in the length direction Z of the tubular member 11 with respect to the other. Thus, the direction of the loop P can be changed in the direction X in which the first and second pieces 13 and 14 face each other. Hereinafter, a specific description will be given.

図6(A)、(B)は、ループ形成部材12に形成されたループPの向きを変化させるときの原理説明図である(図6(A)、(B)では、操作本体部21や第1、第2の操作部22,23の図示を省略している)。図6(A)、図6(B)において、点線は第1、第2の各片13、14の基端13b、14bが揃えられた状態でのループ形成部材12のループPの向きを示している。   FIGS. 6A and 6B are explanatory diagrams of the principle when changing the direction of the loop P formed on the loop forming member 12 (in FIGS. 6A and 6B, the operation main body 21 and The illustration of the first and second operation units 22 and 23 is omitted). 6A and 6B, the dotted lines indicate the direction of the loop P of the loop forming member 12 in a state where the base ends 13b, 14b of the first and second pieces 13, 14 are aligned. ing.

図6(A)の実線に示すように、第1の片13の基端13bを第2の片14の基端14bよりも筒部材11の長さ方向Zの一方側に移動させた場合には、ループ形成部材12のループPは、第1、第2の各片13、14が向き合う方向Xの一方側(第2の片14側)へ向きを変える。   As shown by the solid line in FIG. 6A, when the base end 13b of the first piece 13 is moved to one side in the length direction Z of the tubular member 11 from the base end 14b of the second piece 14 The direction of the loop P of the loop forming member 12 is changed to one side (the side of the second piece 14) in the direction X in which the first and second pieces 13 and 14 face each other.

図6(B)の実線に示すように、第1の片13の基端13bを第2の片14の基端14bよりも長さ方向Zの他方側に移動させた場合には、ループ形成部材12のループPは、第1、第2の各片13、14が向き合う方向Xの他方側(第1の片13側)へ向きを変える。   As shown by the solid line in FIG. 6B, when the base end 13b of the first piece 13 is moved to the other side in the length direction Z from the base end 14b of the second piece 14, a loop is formed. The loop P of the member 12 changes its direction to the other side (the first piece 13 side) in the direction X in which the first and second pieces 13 and 14 face each other.

このように、第1の片13の基端13bと第2の片14の基端14bとのうち、一方を他方に対して長さ方向Zに相対的に移動させることにより、ループ形成部材12のループPは、第1、第2の各片13、14が向き合う方向Xへ撓み、向きが変化する。撓む度合い、すなわち向きの変化の度合いは、一方の基端を他方の基端に対してどの程度移動させるかによって定まる。また、この撓みによりループ形成部材12のループPの形状が変化する。   As described above, by moving one of the base end 13b of the first piece 13 and the base end 14b of the second piece 14 relative to the other in the length direction Z, the loop forming member 12 is moved. Loop P is bent in the direction X in which the first and second pieces 13 and 14 face each other, and the direction changes. The degree of bending, that is, the degree of change in orientation, is determined by how much one base end is moved relative to the other base end. Further, the shape of the loop P of the loop forming member 12 changes due to the bending.

図6(A)においては、第2の片14の基端14bを定位置に止め、第1の片13の基端13bを筒部材11の長さ方向Zの一方側に移動させているが、この状態は,第1の片13の基端13bを定位置に止め、第2の片14の基端14bを筒部材11の長さ方向Zの他方側に移動させた状態と等価である。よって,第2の片14の基端14bを筒部材11の長さ方向Zの他方側に移動させた場合であっても、図6(A)と同様に、ループ形成部材12のループPは、方向Xの一方側(第2の片14の側)へ向きを変える。また、図6(B)においては、第2の片14の基端14bを定位置に止め、第1の片13の基端13bを筒部材11の長さ方向Zの他方側に移動させているが、この状態は,第1の片13の基端13bを定位置に止め、第2の片14の基端14bを筒部材11の長さ方向Zの一方側に移動させた状態と等価である。よって,第2の片14の基端14bを筒部材11の長さ方向Zの一方側に移動させた場合であっても、図6(B)と同様に、ループ形成部材12のループPは、方向Xの他方側(第1の片13の側)へ向きを変える。   In FIG. 6A, the base end 14b of the second piece 14 is stopped at a fixed position, and the base end 13b of the first piece 13 is moved to one side in the length direction Z of the tubular member 11. This state is equivalent to a state in which the base end 13b of the first piece 13 is stopped at a fixed position and the base end 14b of the second piece 14 is moved to the other side in the longitudinal direction Z of the tubular member 11. . Therefore, even when the base end 14b of the second piece 14 is moved to the other side in the length direction Z of the tubular member 11, the loop P of the loop forming member 12 is not moved as in FIG. , The direction is changed to one side (the side of the second piece 14) in the direction X. In FIG. 6B, the base end 14b of the second piece 14 is stopped at a fixed position, and the base end 13b of the first piece 13 is moved to the other side in the longitudinal direction Z of the tubular member 11. However, this state is equivalent to a state in which the base end 13b of the first piece 13 is stopped at a fixed position and the base end 14b of the second piece 14 is moved to one side in the longitudinal direction Z of the tubular member 11. It is. Therefore, even when the base end 14b of the second piece 14 is moved to one side in the length direction Z of the tubular member 11, the loop P of the loop forming member 12 is not moved as in FIG. The direction is changed to the other side of the direction X (the side of the first piece 13).

上記の構成の医療用スネア20を用いて体腔内のポリープを除去するには、例えば、まず、ループ形成部材12を筒部材11の内部に引き込んだ状態で筒部材11を先端側から内視鏡装置の体腔挿入部に挿通する。そして、内視鏡装置の体腔挿入部を体内に挿入し、内視鏡装置の先端部に設けられた撮像素子による画像を見ながら内視鏡装置の先端部をポリープの近傍まで移動させる。ポリープ近傍への到達後、医療用スネア20の筒部材11を内視鏡装置の先端から突出させる。次に、医療用スネア20の第1、第2の操作部22、23の位置が揃った状態にした後、第1、第2の操作部22、23の操作で、第1、第2の各片13、14の基端13b,14bを筒部材11の長さ方向Zの一方側に移動させて、ループ形成部材12を筒部材11の先端から突出させ、ループPを形成する。次に、第1、第2の操作部22、23を個別に操作して、ループ形成部材12のループPを所望の向きに撓ませ、ポリープに引っ掛ける。そして、第1、第2の各片13、14の基端13b,14bを筒部材11の長さ方向Zの他方側に移動させて、ループ形成部材12を筒部材11に引き込んでポリープを締め付け、最終的にポリープを体組織から切断する。   In order to remove the polyp in the body cavity using the medical snare 20 having the above-described configuration, for example, first, the tubular member 11 is pulled from the distal end side with the loop forming member 12 pulled into the inside of the tubular member 11. Insert the body cavity insertion part of the device. Then, the body cavity insertion section of the endoscope device is inserted into the body, and the distal end portion of the endoscope device is moved to the vicinity of the polyp while viewing an image obtained by the imaging element provided at the distal end portion of the endoscope device. After reaching the vicinity of the polyp, the cylindrical member 11 of the medical snare 20 is made to protrude from the distal end of the endoscope apparatus. Next, after the positions of the first and second operation units 22 and 23 of the medical snare 20 are aligned, the first and second operation units 22 and 23 are operated to operate the first and second operation units. By moving the base ends 13b and 14b of the pieces 13 and 14 to one side in the longitudinal direction Z of the cylindrical member 11, the loop forming member 12 is projected from the distal end of the cylindrical member 11 to form the loop P. Next, the first and second operation units 22 and 23 are individually operated to bend the loop P of the loop forming member 12 in a desired direction and hook the loop P on the polyp. Then, the base ends 13b and 14b of the first and second pieces 13 and 14 are moved to the other side in the length direction Z of the tubular member 11, and the loop forming member 12 is pulled into the tubular member 11 to tighten the polyp. Finally, the polyp is cut from body tissue.

なおポリープを確実に切断すべく、第1、第2の各片13、14は導体とされてもよい。この場合、例えば第1、第2の各片13、14に図示しない高周波電源装置を電気的に接続し、ポリープの切除の際に第1、第2の各片13、14に高周波電流を流すことでポリープの根元を焼灼して体組織から切断する。   In order to surely cut the polyp, the first and second pieces 13 and 14 may be conductors. In this case, for example, a high-frequency power supply device (not shown) is electrically connected to the first and second pieces 13 and 14, and a high-frequency current flows through the first and second pieces 13 and 14 when the polyp is cut off. This cauterizes the root of the polyp and cuts it from body tissue.

また上記実施形態に示した医療用スネア20は、例えば、血管内に存在する除去対象物(例えばカテーテルの破片)を除去するためにも使用できる。以下、この用途における医療用スネア20の操作方法の一例について説明する。   The medical snare 20 shown in the above embodiment can also be used for removing an object to be removed (for example, a piece of a catheter) existing in a blood vessel. Hereinafter, an example of an operation method of the medical snare 20 in this application will be described.

まず、ループ形成部材12を筒部材11の内部に引き込んだ状態で、例えばX線透視装置のモニターで血管内部を見ながら、筒部材11を血管内に挿入して、筒部材11の先端部を除去対象物の近傍まで移動させる。筒部材11の先端部が除去対象物の近傍に到達した後、第1、第2の操作部22、23の操作で、第1、第2の各片13、14の基端13b,14bを筒部材11の長さ方向Zの一方側に移動させて、ループ形成部材12を筒部材11の先端から突出させて、ループPを形成する。次に、第1、第2の操作部22、23を個別に操作して、ループ形成部材12のループPを所望の向きに撓ませ、ループPの内側に除去対象物が位置した状態にする。そして、第1、第2の操作部22、23の操作で、第1、第2の各片13、14の基端13b,14bを筒部材11の長さ方向Zの他方側に移動させて、ループPを小さくすることで、ループPに除去対象物が保持された状態にする。そして、筒部材11を体外に引き出すことで、ループPに保持された除去対象物を体外に取り出す。   First, in a state where the loop forming member 12 is pulled into the inside of the tubular member 11, the tubular member 11 is inserted into the blood vessel while viewing the inside of the blood vessel with, for example, a monitor of an X-ray fluoroscope, and the distal end of the tubular member 11 is removed. Move to the vicinity of the object to be removed. After the distal end portion of the cylindrical member 11 reaches the vicinity of the object to be removed, the base ends 13b, 14b of the first and second pieces 13, 14 are operated by operating the first and second operating portions 22, 23. The loop member 12 is moved to one side in the length direction Z of the cylindrical member 11 to project the loop forming member 12 from the tip of the cylindrical member 11 to form a loop P. Next, the first and second operation units 22 and 23 are individually operated to bend the loop P of the loop forming member 12 in a desired direction, so that the object to be removed is located inside the loop P. . Then, by operating the first and second operating portions 22 and 23, the base ends 13b and 14b of the first and second pieces 13 and 14 are moved to the other side in the length direction Z of the tubular member 11. By reducing the loop P, the object to be removed is held in the loop P. Then, by pulling the tubular member 11 out of the body, the object to be removed held in the loop P is taken out of the body.

以上説明した実施形態によれば、第1、第2の各片13、14の基端の双方を筒部材11の長さ方向の一方側に移動させることで、第1、第2の各片13、14の先端側を筒部材11の先端から突出させて、当該第1、第2の各片13、14の先端側によって、筒部材11の先端の位置から延びるループPを形成できる。   According to the embodiment described above, by moving both the base ends of the first and second pieces 13 and 14 to one side in the length direction of the tubular member 11, the first and second pieces are respectively moved. With the distal ends of the cylindrical members 11 and 14 protruding from the distal end of the tubular member 11, a loop P extending from the distal end of the tubular member 11 can be formed by the distal ends of the first and second pieces 13 and 14.

そして、第1の片13の基端13bと第2の片14の基端14bとのうち、一方を他方に対して筒部材11の長さ方向Zに相対的に移動させる簡易な操作によって、第1の片13と第2の片14とが向き合う方向Xに、ループPの向きを変えることができる。。また、第1の片13の基端13bと第2の片14の基端14bとを長さ方向Zに移動させる簡易な操作で、第1、第2の各片13、14が筒部材11の先端から突出する長さを変えることで、ループPの形状を変化させることができる。
以上のことから、本実施形態の引っ掛け具10及び医療用スネア20は、ループPの向きや形状を容易に変化させることができるので、操作性に優れる。したがって、様々な大きさのポリープを切除することや、様々な大きさの除去対象物を体外に除去することが可能である。
Then, by a simple operation of relatively moving one of the base end 13b of the first piece 13 and the base end 14b of the second piece 14 with respect to the other in the length direction Z of the tubular member 11, The direction of the loop P can be changed in the direction X in which the first piece 13 and the second piece 14 face each other. . Further, the first and second pieces 13 and 14 are connected to the cylindrical member 11 by a simple operation of moving the base end 13b of the first piece 13 and the base end 14b of the second piece 14 in the length direction Z. The shape of the loop P can be changed by changing the length of the loop P protruding from the tip.
From the above, the hook 10 and the medical snare 20 of the present embodiment can easily change the direction and the shape of the loop P, and are excellent in operability. Therefore, it is possible to excise polyps of various sizes and to remove removal objects of various sizes outside the body.

また本実施形態によれば、ループ形成部材12のループPは向き合う方向Xにその他の方向よりも大きな可撓性を有しており、各基端を移動させることで向き合う方向Xへ撓む。このため、各片13、14の基端13b、14bを移動させる際にループPは他の向きに向いたり変形したりすることがなく、ループ形成部材12の形状や向きを安定して変化させることができる。また、変形方向が安定するため、操作性も向上する。   Further, according to the present embodiment, the loop P of the loop forming member 12 has greater flexibility in the facing direction X than in other directions, and bends in the facing direction X by moving each base end. For this reason, when moving the base ends 13b and 14b of the pieces 13 and 14, the loop P does not face or deform in another direction, and stably changes the shape and the direction of the loop forming member 12. be able to. In addition, since the deformation direction is stable, operability is also improved.

また本実施形態では、各片13、14の断面形状をいわゆる縦長形状とし、一方の片の基端と他方の片の基端とを個別に移動可能とするだけの簡単な構成であるため、部品点数を増やさずに操作性を向上させることができる。   Further, in the present embodiment, the cross-sectional shape of each of the pieces 13 and 14 is a so-called vertically long shape, and has a simple configuration in which the base end of one piece and the base end of the other piece can be individually moved. Operability can be improved without increasing the number of parts.

なお上記実施形態では、第1、第2の各片13、14の先端側を筒部材11から突出させた際に、第1、第2の各片13、14の先端側が弾性復帰するように第1、第2の各片13、14に形状記憶が施されていたが、第1、第2の各片13、14は、外力が加えられていないときに閉じた状態となるように形状記憶が施されていてもよい(閉じた状態とは、第1の片13と第2の片14とが向き合う方向において、第1の片13と第2の片14とが接近した状態を意味する)。図7(A)〜図7(D)は、このような場合において、ループPの形状及び向きを変化させるときの原理説明図である(図7(A)〜図7(D)では、操作本体部21や第1、第2の操作部22,23の図示を省略している)。   In the above-described embodiment, the distal ends of the first and second pieces 13 and 14 are elastically returned when the distal ends of the first and second pieces 13 and 14 are protruded from the tubular member 11. Although the first and second pieces 13 and 14 have been subjected to shape memory, the first and second pieces 13 and 14 are shaped so that they are closed when no external force is applied. The closed state means that the first piece 13 and the second piece 14 are close to each other in the direction in which the first piece 13 and the second piece 14 face each other. Do). FIGS. 7A to 7D are explanatory diagrams of the principle when changing the shape and the direction of the loop P in such a case (in FIGS. 7A to 7D, the operation The illustration of the main body 21 and the first and second operation units 22 and 23 is omitted).

図7(A)に示すように、第1、第2の各片13、14の基端13b、14bを揃えて筒部材11からループ形成部材12を突出させた状態では、ループ形成部材12によって形成されるループPは、これを構成する第1、第2の各片13、14が接近していることで、幅の狭いものとなっている。第1の片13の基端13bを第2の片14の基端14bよりも先端側に移動させると、図7(B)に示すように、ループPは、第2の片14の側に撓んで向きを変えるとともに、ループPの幅(ループPを構成する第1の片13と第2の片14との間の幅)が大きくなり始める。さらに、図7(C)、図7(D)に示すように、第1の片13の基端13bを第2の片14の基端14bよりもさらに先端側に移動させることで、撓みが大きくなるとともに、ループPが大きくなる。 同様に、第2の片14の基端14bを第1の片13の基端13bよりも先端側に移動させる場合は、ループ形成部材12によって形成されるループPは、第1の片13の側に撓んで向きを変える。   As shown in FIG. 7A, in a state where the base ends 13b and 14b of the first and second pieces 13 and 14 are aligned and the loop forming member 12 is projected from the tubular member 11, the loop forming member 12 The formed loop P is narrow because the first and second pieces 13 and 14 constituting the loop P are close to each other. When the proximal end 13b of the first piece 13 is moved to the distal end side than the proximal end 14b of the second piece 14, the loop P is moved toward the second piece 14 as shown in FIG. As the direction is changed by bending, the width of the loop P (the width between the first piece 13 and the second piece 14 constituting the loop P) starts to increase. Further, as shown in FIGS. 7 (C) and 7 (D), the deflection is caused by moving the proximal end 13b of the first piece 13 further distally than the proximal end 14b of the second piece 14. As the size increases, the loop P increases. Similarly, when the base end 14b of the second piece 14 is moved to the distal end side from the base end 13b of the first piece 13, the loop P formed by the loop forming member 12 Change direction by bending to the side.

また上記実施形態に示した医療用スネア20は、第1、第2の操作部22、23を操作本体部21の摺動溝Mに沿って摺動させることで、第1、第2の片13、14の基端13b,14bが移動するものであったが、例えば、第1、第2の片13、14の基端13b,14bを操作本体部21の外側に延び出して、第1の片13の基端13bに第1の操作部22を連結し、第2の片14の基端14bに第2の操作部23を連結することで、第1、第2の操作部22、23が摺動溝Mを通過しないものとしてもよい。また或いは、操作本体部21を省略し、筒部材11の外側に延び出た第1、第2の片13、14の基端13b,14bに第1、第2の操作部22、23を連結してもよい。以上のようにすれば、第1、第2の操作部22、23の操作によって、第1、第2の片13、14の基端13b,14bを筒部材11の長さ方向Zに移動させることだけでなく、第1の片13の基端13bを、第1の片13の軸回りに回動させることや、第2の片14の基端14bを、第2の片14の軸回りに回動させることも可能となる。図8〜図11は、このような場合における第1、第2の片13、14の動きを示している。   Also, the medical snare 20 shown in the above embodiment slides the first and second operating portions 22 and 23 along the sliding groove M of the operating main body portion 21 to form the first and second pieces. Although the base ends 13b and 14b of the members 13 and 14 move, for example, the base ends 13b and 14b of the first and second pieces 13 and 14 extend to the outside of the operation main body portion 21 and the first parts By connecting the first operating part 22 to the base end 13b of the piece 13 and connecting the second operating part 23 to the base end 14b of the second piece 14, the first and second operating parts 22, 23 may not pass through the sliding groove M. Alternatively, the operation body portion 21 is omitted, and the first and second operation portions 22 and 23 are connected to the base ends 13b and 14b of the first and second pieces 13 and 14 extending outside the cylindrical member 11. May be. According to the above, the base ends 13b, 14b of the first and second pieces 13, 14 are moved in the longitudinal direction Z of the tubular member 11 by operating the first and second operation portions 22, 23. Not only that, the base end 13b of the first piece 13 can be rotated around the axis of the first piece 13 or the base end 14b of the second piece 14 can be turned around the axis of the second piece 14. Can also be rotated. FIGS. 8 to 11 show the movement of the first and second pieces 13 and 14 in such a case.

上述のように第1、第2の片13、14の基端13b,14bを回動可能にする場合には、第1、第2の各片13、14は、筒部材11に軸回動自由に支持される構成とされる。筒部材11の内孔11aは、第1、第2の各片13、14の基端13b、14bがそれぞれ軸回動可能な大きさに設定される。   When the base ends 13b and 14b of the first and second pieces 13 and 14 are made rotatable as described above, the first and second pieces 13 and 14 are pivotally moved around the cylindrical member 11. It is configured to be freely supported. The inner hole 11a of the tubular member 11 is set to a size such that the base ends 13b and 14b of the first and second pieces 13 and 14 can be pivoted.

上記実施形態では、第1、第2の片13、14の基端13b,14bが筒部材11の長さ方向Zに移動可能であることで、ループPの形状を変えることや、第1、第2の各片13、14が向き合う方向XにループPの向きを変えることが可能であったが、上述のように第1、第2の各片13、14の基端13b,14bを回動可能とすれば、ループPの向きを方向Xと直交する方向Yに変えることや、ループPの向きを筒部材11の周方向に変えることも、さらに可能となる。   In the above embodiment, the base end 13b, 14b of the first and second pieces 13, 14 is movable in the length direction Z of the tubular member 11, thereby changing the shape of the loop P, Although it was possible to change the direction of the loop P in the direction X in which the second pieces 13 and 14 face each other, the base ends 13b and 14b of the first and second pieces 13 and 14 were turned as described above. If movable, the direction of the loop P can be changed to the direction Y orthogonal to the direction X, and the direction of the loop P can be further changed to the circumferential direction of the tubular member 11.

すなわち図8(A)に示すように、第1、第2の各片13、14の基端13b、14bを、第1、第2の各片13、14の上端が互いに近づく向き(矢印Aの向き)に回動させると、第1、第2の各片13、14が矢印Aの向きに捻られて、図8(B)に示すように、ループ形成部材12に、上側(方向Yの一方側)への撓みが生じて、当該撓みは、第1、第2の各片13、14の先端に近づくにつれて大きなものとなる。これにより、ループPは、上側(方向Yの一方側)に傾いたものものとなる。   That is, as shown in FIG. 8A, the base ends 13b and 14b of the first and second pieces 13 and 14 are oriented such that the upper ends of the first and second pieces 13 and 14 approach each other (arrow A). 8B), the first and second pieces 13 and 14 are twisted in the direction of arrow A, and the upper and lower portions of the loop forming member 12 (in the direction Y) as shown in FIG. Of the first and second pieces 13, 14, and the deflection becomes larger as the tip of each of the first and second pieces 13, 14 is approached. As a result, the loop P is inclined upward (one side in the direction Y).

また図9(A)に示すように、第1、第2の各片13、14の基端13b、14bを、第1、第2の各片13、14の下端が互いに近づく向き(矢印Bの向き)に回動させると、第1、第2の各片13、14が矢印Bの向きに捻られて、図9(B)示すように、ループ形成部材12に下側(方向Yの他方側)への撓みが生じて、当該撓みは、第1、第2の各片13、14の先端に近づくにつれて大きなものとなる。これにより、ループPは、下側(方向Yの他方側)に傾いたものとなる。   As shown in FIG. 9A, the base ends 13b and 14b of the first and second pieces 13 and 14 are oriented in such a manner that the lower ends of the first and second pieces 13 and 14 approach each other (arrow B). (First direction), the first and second pieces 13 and 14 are twisted in the direction of arrow B, as shown in FIG. The bending to the other side) occurs, and the bending becomes larger as approaching the tips of the first and second pieces 13 and 14. Accordingly, the loop P is inclined downward (the other side in the direction Y).

なお図8、図9においては、第1、第2の各片13、14の基端13b、14bを同じ位置に揃えた状態で、第1、第2の各片13、14の基端13b、14bを回動させた場合を示しているが、第1、第2の各片13、14の基端13b、14bの位置が筒部材11の長さ方向Zにずれた状態で、基端13b、14bを回動させてもよい。   8 and 9, the base ends 13b and 14b of the first and second pieces 13 and 14 are aligned at the same position, and the base ends 13b of the first and second pieces 13 and 14 are aligned. , 14b are rotated, but the positions of the base ends 13b, 14b of the first and second pieces 13, 14 are shifted in the longitudinal direction Z of the tubular member 11, and the base ends are shifted. 13b and 14b may be rotated.

図10は、第2の片14の基端14bを固定しない状態で、第1の片13の基端13bを、第1の片13の軸回りに回動させた場合の動きを示している。上記のように第1の片13の基端13bを回動させた場合には、第1の片13の基端13bに加えたトルクが、第1の片13の長さ方向に伝達されることで、第1の片13の全体が、第1の片13の軸回りに回動するものとなる。そして、第1の片13に加えたトルクが、先端部12を経由して、第2の片14に伝達されることで、第2の片14は、第1の片13の軸13Jを中心とする周方向に移動するものとなる。そして上記の第1の片13や第2の片14の動きによって、ループPの向きは、筒部材11の周方向に変わる。   FIG. 10 shows the movement when the base end 13b of the first piece 13 is rotated about the axis of the first piece 13 in a state where the base end 14b of the second piece 14 is not fixed. . When the base end 13b of the first piece 13 is rotated as described above, the torque applied to the base end 13b of the first piece 13 is transmitted in the length direction of the first piece 13. Thus, the entire first piece 13 rotates around the axis of the first piece 13. Then, the torque applied to the first piece 13 is transmitted to the second piece 14 via the tip 12, so that the second piece 14 is centered on the shaft 13 </ b> J of the first piece 13. It moves in the circumferential direction. The direction of the loop P changes in the circumferential direction of the tubular member 11 by the movement of the first piece 13 and the second piece 14 described above.

図11は、第1の片13の基端13bを固定しない状態で、第2の片14の基端14bを、第2の片14の軸回りに回動させた場合の動きを示している。上記のように第2の片14の基端14bを回動させた場合には、第2の片14の基端14bに加えたトルクが、第2の片14の長さ方向に伝達されることで、第2の片14の全体が、第2の片14の軸回りに回動するものとなる。そして、第2の片14に加えたトルクが、先端部12を経由して、第1の片13に伝達されることで、第1の片13は、第2の片14の軸14Jを中心とする周方向に移動するものとなる。そして上記の第1の片13や第2の片14の動きによって、ループPの向きが、筒部材11の周方向に変わる。   FIG. 11 shows the movement when the base end 13b of the first piece 13 is not fixed and the base end 14b of the second piece 14 is rotated around the axis of the second piece 14. . When the base end 14b of the second piece 14 is rotated as described above, the torque applied to the base end 14b of the second piece 14 is transmitted in the length direction of the second piece 14. Accordingly, the entire second piece 14 rotates around the axis of the second piece 14. Then, the torque applied to the second piece 14 is transmitted to the first piece 13 via the distal end portion 12, so that the first piece 13 is centered on the axis 14J of the second piece 14. It moves in the circumferential direction. The direction of the loop P changes in the circumferential direction of the tubular member 11 by the movement of the first piece 13 and the second piece 14.

以上のように図8〜図11に示す形態(第1の片13や第2の片14の基端13b,14bがそれぞれ筒部材11の長さ方向Zに移動可能であることに加えて、第1、第2の片13、14の基端13b,14bがそれぞれ回動可能な形態)によれば、上記実施形態と同様、ループPの形状を変えることや、ループPの向きを方向Xに変えることが可能であることに加え、ループPの向きを方向Yに変えることや、ループPの向きを筒部材11の周方向に変えることも可能となる。したがって、ループPの形状を所望の形状にしつつ、ループPを様々な方向に向けることができる。このため、ループPをポリープに引っ掛けることや、ループPに除去対象物を保持させることを、より容易に実現できる。   As described above, in addition to the configurations shown in FIGS. 8 to 11 (in addition to the fact that the base ends 13b and 14b of the first piece 13 and the second piece 14 are respectively movable in the longitudinal direction Z of the tubular member 11, According to the embodiment in which the base ends 13b and 14b of the first and second pieces 13 and 14 are rotatable, respectively, the shape of the loop P can be changed or the direction of the loop P can be changed in the direction X as in the above embodiment. In addition to the above, the direction of the loop P can be changed in the direction Y, and the direction of the loop P can be changed in the circumferential direction of the tubular member 11. Therefore, the loop P can be oriented in various directions while the shape of the loop P is formed in a desired shape. Therefore, hooking the loop P on the polyp and holding the object to be removed on the loop P can be more easily realized.

なお上述のように第1、第2の片13、14の基端13b,14bを回動可能とする場合には、図12に示すように、第1の片13や第2の片14を、螺旋状のトルクコイルCから構成することが好ましい((図12(a)の断面図では、筒部材11や第1の片13や第2の片14のハッチングを省略している)。このようにすれば、第1の片13や第2の片14が長い場合においても、第1の片13や第2の片14の基端13b,14bに加えたトルクが、確実に先端部12に伝達される。このため、ループPの向きを方向Yに変えることや、ループPの向きを筒部材11の周方向に変えることを確実に実現できる(第1の片13や第2の片14をトルクコイルから構成する場合には、第1の片13や第2の片14が筒部材11の内孔11aに挿通された状態で、第1の片13や第2の片14の螺旋は、筒部材11の長さ方向Zに延びるものとされる)。   When the bases 13b and 14b of the first and second pieces 13 and 14 are rotatable as described above, the first piece 13 and the second piece 14 are connected as shown in FIG. It is preferable that the coil member be constituted by a helical torque coil C (in the sectional view of FIG. 12A, hatching of the cylindrical member 11, the first piece 13, and the second piece 14 is omitted). By doing so, even when the first piece 13 and the second piece 14 are long, the torque applied to the proximal ends 13b and 14b of the first piece 13 and the second piece 14 can be reliably applied to the distal end portion 12b. Therefore, it is possible to reliably realize changing the direction of the loop P in the direction Y and changing the direction of the loop P in the circumferential direction of the tubular member 11 (the first piece 13 and the second piece). In the case where the first piece 13 and the second piece 14 are formed of a torque coil, the first piece 13 and the second piece 14 In the insertion state, the spiral of the first piece 13 and second piece 14 is intended to extend in the longitudinal direction Z of the cylindrical member 11).

なお第1の片13や第2の片14を、トルクコイルCから構成する場合には、トルクコイルCを折り曲げることで、ループ形成部材12が形成され得る。この場合、トルクコイルCの折り曲げ位置によって、ループ形成部材12の先端部12aが構成される。そして先端部12aと一方の基端13bの間のトルクコイルCの範囲によって第1の片13が構成され、上記先端部12aと他方の基端13bとの間のトルクコイルCの範囲によって、第2の片13が構成される。   When the first piece 13 and the second piece 14 are formed of the torque coil C, the loop forming member 12 can be formed by bending the torque coil C. In this case, the bending position of the torque coil C forms the distal end portion 12a of the loop forming member 12. The first piece 13 is formed by the range of the torque coil C between the distal end portion 12a and one base end 13b, and the first piece 13 is formed by the range of the torque coil C between the distal end portion 12a and the other base end 13b. 2 pieces 13 are constituted.

また、第1、第2の各片13,14を別個のトルクコイルCから構成してもよい。この場合には、第1片13を構成するトルクコイルCの先端部と、第2片14を構成するトルクコイルCの先端部とが接合されていることで、ループ形成部材12が形成される。   Further, the first and second pieces 13 and 14 may be constituted by separate torque coils C. In this case, the loop forming member 12 is formed by joining the tip of the torque coil C forming the first piece 13 and the tip of the torque coil C forming the second piece 14. .

また図12では、3つのトルクコイルC1,C2,C3によって第1の片13や第2の片14を構成する例を示しているが、第1の片13や第2の片14を構成するトルクコイルCの数は、1又は任意の複数とすることができる。   FIG. 12 shows an example in which the first piece 13 and the second piece 14 are configured by the three torque coils C1, C2, and C3, but the first piece 13 and the second piece 14 are configured. The number of the torque coils C can be one or an arbitrary plural number.

なお図12に示すように、第1の片13や第2の片14を、「外層のトルクコイルCの内面が内層のトルクコイルCの外面に密着し、且つ、外層のトルクコイルCの巻方向と内層のトルクコイルCの巻方向とが逆になっている多条多層コイル」から構成することで、第1の片13や第2の片14におけるトルク伝達性を向上させることができる(図12の例では、最外層のトルクコイルC1の内面が中間層のトルクコイルC2の外面に密着し、トルクコイルC2の内面が最内層のトルクコイルC2の外面に密着し、トルクコイルの巻方向とが逆、トルクコイルC2の巻方向とトルクコイルC3の巻方向とが逆であることで、第1の片13や第2の片14におけるトルク伝達性を向上させることができる)。   As shown in FIG. 12, the first piece 13 and the second piece 14 are referred to as “the inner surface of the outer-layer torque coil C is in close contact with the outer surface of the inner-layer torque coil C, and the winding of the outer-layer torque coil C is performed. The direction and the winding direction of the inner layer of the torque coil C are opposite to each other, so that the torque transmission of the first piece 13 and the second piece 14 can be improved. In the example of FIG. 12, the inner surface of the outermost torque coil C1 is in close contact with the outer surface of the intermediate layer torque coil C2, the inner surface of the torque coil C2 is in close contact with the outer surface of the innermost torque coil C2, and the winding direction of the torque coil. Conversely, when the winding direction of the torque coil C2 and the winding direction of the torque coil C3 are opposite, the torque transmission of the first piece 13 and the second piece 14 can be improved).

図13、図14は、本発明の引っ掛け具10のさらに他の実施形態を示す。
本実施形態は、上記した何れかの実施形態の引っ掛け具10の構成を屈曲・伸展装置30に組み付けて構成されたものである。なお、図13、図14においては、屈曲・伸展装置30の先端側のみを図示しており、基端側の図示を省略している。
屈曲・伸展装置30は、径方向に変形可能である中空筒状のガイド部31と、ガイド部31内に長さ方向に沿って移動自在に挿入される可動片32とを備えている。
ガイド部31は、弾性があり残留応力の小さな材料から形成されることが好ましい。このような材料として、復元力が大きい超弾性金属素材であるβチタンやニッケルチタン(ニチノール)やそれらの含む合金、ポリエーテルエーテルケトン(PEEK)などの樹脂製の材料や、ゴム等を使用できる。
13 and 14 show still another embodiment of the hook 10 of the present invention.
In the present embodiment, the configuration of the hook 10 of any of the above-described embodiments is assembled to the bending / extending device 30. 13 and 14, only the distal end side of the bending / extending device 30 is shown, and the proximal end side is not shown.
The bending / extending device 30 includes a hollow cylindrical guide portion 31 that can be deformed in the radial direction, and a movable piece 32 that is movably inserted into the guide portion 31 along the length direction.
The guide portion 31 is preferably formed of a material having elasticity and small residual stress. As such a material, a resin material such as β-titanium, nickel-titanium (Nitinol) which is a super-elastic metal material having a large restoring force, an alloy containing them, polyetheretherketone (PEEK), rubber, or the like can be used. .

可動片32は、前記ガイド部31の長さ方向に沿って延び、互いに向き合う方向Tに可撓性を有する第1、第2の帯状の可撓片33、34と、第1、第2の可撓片33、34の先端33a、34a同士をつなぐ接続片35とを含んでいる。   The movable piece 32 extends along the length direction of the guide portion 31 and has first and second strip-shaped flexible pieces 33 and 34 having flexibility in a direction T facing each other. And a connecting piece 35 for connecting the tips 33a, 34a of the flexible pieces 33, 34 to each other.

ガイド部31の先端面31a及び接続片35には、前記した引っ掛け具10の筒部材11を通すための貫通孔31b、35aが形成されている。   Through holes 31b and 35a are formed in the distal end surface 31a of the guide portion 31 and the connection piece 35 for passing the tubular member 11 of the hook 10 described above.

第1、第2の可撓片33、34と接続片35は、ガイド部31よりも大きな剛性を有する材料から形成される。例えば、上述のようにガイド部31がβチタンやニッケルチタンから形成される場合には、第1、第2の可撓片33、34は、ポリプロピレン、アクリル系材料、PEEK(ポリエーテルエーテルケトン)樹脂などを用いて、ガイド部31よりも大きな剛性を有するように形成される。なお、第1、第2の可撓片33、34やガイド部31の幾何パラメータ(第1、第2の可撓片33、34やガイド部31の厚み、幅、或いは長さ)が調整されることで、第1、第2の可撓片33、34の剛性が、ガイド部31の剛性よりも、大きくされてもよい。   The first and second flexible pieces 33 and 34 and the connection piece 35 are formed from a material having greater rigidity than the guide portion 31. For example, when the guide portion 31 is made of β-titanium or nickel-titanium as described above, the first and second flexible pieces 33 and 34 are made of polypropylene, an acrylic material, or PEEK (polyetheretherketone). It is formed using resin or the like so as to have greater rigidity than the guide portion 31. Note that the geometric parameters of the first and second flexible pieces 33 and 34 and the guide portion 31 (the thickness, width, or length of the first and second flexible pieces 33 and 34 and the guide portion 31) are adjusted. By doing so, the rigidity of the first and second flexible pieces 33 and 34 may be greater than the rigidity of the guide portion 31.

この屈曲・伸展装置30では、図14(A)、図14(B)に示すように、第1、第2の可撓片33、34の基端33b、34bのうち、一方の基端を他方の基端に対して、ガイド部31の長さ方向Sに相対的に摺動させることで、可動片32には、第1、第2の可撓片33、34の接続片35の位置を節点とする撓みが、第1、第2の可撓片33、34が向き合う方向Tに生じる。撓みが生じる原理は図6に示すループ形成部材12の撓みの原理と同じであるため説明を省略する。
撓んだ可動片32がガイド部31の内面の一部又は全部に接することで、ガイド部31にも上記向き合う方向Tへの撓みが生じる。ガイド部31の撓みに応じて、ガイド部31と可動片32の内部に挿入された引っ掛け具10の筒部材11も撓む。
In the bending / extension device 30, as shown in FIGS. 14A and 14B, one of the base ends 33b and 34b of the first and second flexible pieces 33 and 34 is connected to one end. By sliding relative to the other base end in the length direction S of the guide portion 31, the movable piece 32 has the position of the connection piece 35 of the first and second flexible pieces 33 and 34. Is caused in the direction T in which the first and second flexible pieces 33 and 34 face each other. The principle of the bending is the same as the principle of the bending of the loop forming member 12 shown in FIG.
When the bent movable piece 32 contacts a part or all of the inner surface of the guide portion 31, the guide portion 31 also bends in the facing direction T. In accordance with the bending of the guide portion 31, the tubular member 11 of the hook 10 inserted into the guide portion 31 and the movable piece 32 also bends.

図14(A)においては、第1の可撓片33の基端33bを定位置に止め、第2の可撓片34の基端34bを第1の可撓片33の基端33bよりも長さ方向Sの先端側となるように摺動させており、第1、第2の可撓片33、34やガイド部31はその先端部が向き合う方向Tの第1の可撓片33の側に撓んでいる。これにより、筒部材11も同じ側に撓む。なお、第2の可撓片34の基端34bを定位置に止め、第1の可撓片33の基端33bを第2の可撓片34の基端34bよりも長さ方向Sの基端側となるように摺動させても、図14(A)の場合と同様に、第1、第2の可撓片33、34やガイド部31はその先端部が向き合う方向Tの第1の可撓片33の側に撓む。
また、図14(B)においては、第1の可撓片33の基端33bを定位置に止め、第2の可撓片34の基端34bを第1の可撓片33の基端33bよりも長さ方向Sの基端側となるように摺動させており、第1、第2の可撓片33、34やガイド部31はその先端部が向き合う方向Tの第2の可撓片34の側に撓んでいる。これにより、筒部材11も同じ側に撓む。なお、第2の可撓片34の基端34bを定位置に止め、第1の可撓片33の基端33bを第2の可撓片34の基端34bよりも長さ方向Sの先端側となるように摺動させても、図14(B)の場合と同様に、第1、第2の可撓片33、34やガイド部31はその先端部が向き合う方向Tの第2の可撓片34の側に撓む。
屈曲・伸展装置30を伸展させる際には、摺動させた第1、第2の可撓片33、34の基端33b、34bを摺動方向と逆方向に移動させ、基端33b、34bの位置を揃える。これにより、撓んだ可動片32が伸展しガイド部31も可動片2に応じて伸展する。
In FIG. 14A, the base end 33b of the first flexible piece 33 is stopped at a fixed position, and the base end 34b of the second flexible piece 34 is higher than the base end 33b of the first flexible piece 33. The first and second flexible pieces 33 and 34 and the guide portion 31 are slid so as to be on the distal end side in the length direction S. Deflected to the side. Thereby, the cylindrical member 11 also bends to the same side. It should be noted that the base end 34b of the second flexible piece 34 is stopped at a fixed position, and the base end 33b of the first flexible piece 33 is set to be longer than the base end 34b of the second flexible piece 34 in the longitudinal direction S. 14A, the first and second flexible pieces 33 and 34 and the guide portion 31 are moved in the first direction T in the direction T in which their distal ends face each other, as in the case of FIG. To the flexible piece 33 side.
In FIG. 14B, the base end 33b of the first flexible piece 33 is stopped at a fixed position, and the base end 34b of the second flexible piece 34 is fixed to the base end 33b of the first flexible piece 33. The first and second flexible pieces 33 and 34 and the guide portion 31 are slid so as to be closer to the base end in the length direction S. It is bent to the side of the piece 34. Thereby, the cylindrical member 11 also bends to the same side. It should be noted that the base end 34b of the second flexible piece 34 is stopped at a fixed position, and the base end 33b of the first flexible piece 33 is more distal than the base end 34b of the second flexible piece 34 in the longitudinal direction S. 14B, the first and second flexible pieces 33 and 34 and the guide portion 31 are in the second direction T in the direction T in which the distal ends thereof face each other, as in the case of FIG. It bends to the side of the flexible piece 34.
When the bending / extending device 30 is extended, the proximal ends 33b, 34b of the slid first and second flexible pieces 33, 34 are moved in a direction opposite to the sliding direction, and the proximal ends 33b, 34b Align the positions. As a result, the bent movable piece 32 extends, and the guide portion 31 also extends according to the movable piece 2.

また、可動片32をガイド部31の周方向Uに回転させる操作を行うことで、第1、第2の可撓片33、34が向き合う方向Tが回転する。これにより、ガイド部31が撓む方向が変化し、筒部材11の撓む方向も変化する。
その他の構成については、図1の実施形態と同様であるため、対応する部分に同一の符号を付すことで説明を省略する。
Further, by performing an operation of rotating the movable piece 32 in the circumferential direction U of the guide portion 31, the direction T in which the first and second flexible pieces 33 and 34 face each other is rotated. Thereby, the direction in which the guide portion 31 bends changes, and the direction in which the cylindrical member 11 bends also changes.
Other configurations are the same as those in the embodiment of FIG. 1, and the corresponding components are denoted by the same reference numerals and description thereof will be omitted.

上記の構成によれば、屈曲・伸展装置30により引っ掛け具10の筒部材11を撓ませることができるので、内視鏡装置の体腔挿入部の先端から屈曲・伸展装置30を有する引っ掛け具10の筒部材11を突出させ、筒部材11を所望の方向に向けて撓ませることができる。この後、引っ掛け具10の第1、第2の各片13、14の基端13b、14bを摺動させてループ形成部材12のループPの向きや形状を変えることで、ループ形成部材12の向きを所望の方向に制御できるので、ポリープ2にループ形成部材12を引っ掛けやすくなる。図15は、ポリープ2の奥側からポリープ2にループ形成部材12を引っ掛けるために、屈曲・伸展装置30により引っ掛け具10の筒部材11を斜め下方向に撓ませた状態を示す図である。   According to the above configuration, since the tubular member 11 of the hook 10 can be bent by the bending / extension device 30, the hook 10 having the bending / extension device 30 can be bent from the distal end of the body cavity insertion portion of the endoscope device. The tubular member 11 can be protruded, and the tubular member 11 can be bent in a desired direction. Thereafter, by sliding the base ends 13b and 14b of the first and second pieces 13 and 14 of the hook 10 to change the direction and shape of the loop P of the loop forming member 12, Since the direction can be controlled to a desired direction, the loop forming member 12 can be easily hooked on the polyp 2. FIG. 15 is a diagram illustrating a state in which the tubular member 11 of the hook 10 is bent obliquely downward by the bending / extending device 30 in order to hook the loop forming member 12 from the back side of the polyp 2 to the polyp 2.

以上、本発明の一実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない限りにおいて種々の変更が可能である。   As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said Embodiment, A various change is possible unless it deviates from the meaning of this invention.

10 引っ掛け具
11 筒部材
11a 内孔
11b 支持部材
12 ループ形成部材
12a 先端部
12b 針
13、14 第1、第2の片
13a、14a 互いに向き合う面
13b、14b 基端
15 外形
20 医療用スネア
21 操作本体部
22、23 第1、第2の操作部
30 屈曲・伸展装置
31 ガイド部
31a 先端面
31b 貫通孔
32 可動片
33、34 第1、第2の可撓片
33a、34a 第1、第2の可撓片の先端
33b、34b 第1、第2の可撓片の基端
35 接続片
35a 貫通孔
C1,C2,C3 トルクコイル
L1 第1、第2の各片の互いに向き合う方向と直交する方向に沿う外形寸法
L2 第1、第2の各片の互いに向き合う方向に沿う外形寸法
X 第1、第2の片が向き合う方向
Y 互いに向き合う方向と直交する方向
Z 筒部材の長さ方向
P ループ
S ガイド部の長さ方向
T 第1、第2の可撓片が向き合う方向
U ガイド部の周方向
REFERENCE SIGNS LIST 10 hook member 11 cylindrical member 11a inner hole 11b support member 12 loop forming member 12a distal end portion 12b needle 13, 14 first and second pieces 13a, 14a facing surfaces 13b, 14b base end 15 outer shape 20 medical snare 21 operation Main parts 22, 23 First and second operation parts 30 Bending / extending device 31 Guide part 31a Tip surface 31b Through hole 32 Movable pieces 33, 34 First, second flexible pieces 33a, 34a First, second The distal ends 33b, 34b of the first and second flexible pieces 35, the base ends 35 of the first and second flexible pieces The connecting pieces 35a Through holes C1, C2, C3 Torque coils L1 are orthogonal to the directions in which the first and second pieces face each other. External dimension L2 along the direction External dimension X along the direction in which the first and second pieces face each other Direction Y in which the first and second pieces face each other Direction orthogonal to the direction in which the pieces face each other Z Length direction of the cylindrical member The length direction T of the loop S guide unit 1, the circumferential direction U guide part which the second flexible piece facing

Claims (11)

貫通する内孔を有する筒部材と、
前記筒部材の前記内孔に挿通されるループ形成部材とを備え、
前記ループ形成部材は、先端同士が繋がった第1、第2の片を有しており、前記第1、第2の各片の基端は、それぞれ前記筒部材の長さ方向に移動可能とされ、
前記第1、第2の各片の基端の双方を前記筒部材の長さ方向の一方側に移動させることで、前記第1、第2の各片の先端側を前記筒部材の先端から突出させて、当該突出した第1、第2の各片の先端側によって、前記筒部材の先端の位置から延びるループを形成でき、
前記第1の片の基端と第2の片の基端とのうち、一方を他方に対して前記筒部材の長さ方向に相対的に移動させることで、前記第1の片と前記第2の片とが向き合う方向に、前記ループの向きを変えることができ、
前記第1、第2の各片の基端の双方を前記筒部材の長さ方向の他方側に移動させることで、前記第1、第2の各片の先端側を記筒部材の内孔に引き込むことが可能である引っ掛け具。
A tubular member having an inner hole therethrough;
A loop forming member inserted into the inner hole of the cylindrical member,
The loop forming member has first and second pieces whose distal ends are connected to each other, and base ends of the first and second pieces are respectively movable in a length direction of the tubular member. And
By moving both the base ends of the first and second pieces to one side in the longitudinal direction of the cylindrical member, the distal ends of the first and second pieces are moved from the distal end of the cylindrical member. Projecting, a loop extending from the position of the tip of the tubular member can be formed by the tip end of each of the projecting first and second pieces;
By moving one of the base end of the first piece and the base end of the second piece relative to the other in the longitudinal direction of the cylindrical member, the first piece and the second piece are moved. The direction of the loop can be changed in a direction in which the two pieces face each other,
By moving both the base ends of the first and second pieces to the other side in the longitudinal direction of the tubular member, the distal ends of the first and second pieces are bored in the cylindrical member. A hook that can be retracted into.
前記第1、第2の片は、互いに向き合う方向への可撓性が互いに向き合う方向以外の方向への可撓性よりも大きい請求項1に記載の引っ掛け具。   2. The hook according to claim 1, wherein the first and second pieces have greater flexibility in directions facing each other than flexibility in directions other than the direction facing each other. 前記ループ形成部材は、前記第1、第2の各片の長さ方向と直交する方向の断面形状において、前記互いに向き合う方向に沿う外形寸法が、前記互いに向き合う方向と直交する方向に沿う外形寸法より小さい形状である請求項1または2に記載の引っ掛け具。   The loop forming member may be configured such that, in a cross-sectional shape in a direction orthogonal to a length direction of each of the first and second pieces, an external dimension along the direction facing each other has an external dimension along a direction orthogonal to the direction facing each other. The hook according to claim 1 or 2, wherein the hook has a smaller shape. 前記ループ形成部材は、前記第1、第2の各片が別個の線材よりなり、各線材の先端部が接合されている請求項1から3のいずれかに記載の引っ掛け具。   The hook according to any one of claims 1 to 3, wherein the loop forming member is configured such that the first and second pieces are formed of separate wires, and the distal ends of the wires are joined. 前記ループ形成部材は、1本の線材が折り曲げられたものである請求項1から3のいずれかに記載の引っ掛け具。   The hook according to any one of claims 1 to 3, wherein the loop forming member is formed by bending a single wire. 前記第1の片の基端を前記第1の片の軸回りに回動させることや、前記第2の片の基端を前記第2の片の軸回りに回動させることが可能とされることで、前記ループの向きを、前記第1の片と前記第2の片とが向き合う方向と直交する方向や、前記筒部材の周方向に変えることができる請求項1から5のいずれかに記載の引っ掛け具。   The base end of the first piece can be turned around the axis of the first piece, and the base end of the second piece can be turned around the axis of the second piece. The direction of the loop can be changed in a direction orthogonal to a direction in which the first piece and the second piece face each other, or in a circumferential direction of the tubular member. Hook described in. 前記第1の片や前記第2の片は、トルクコイルから構成されている請求項6に記載の引っ掛け具。   The hook according to claim 6, wherein the first piece and the second piece are constituted by torque coils. 前記第1の片や前記第2の片は、外層のトルクコイルの内面が内層のトルクコイルの外面に密着し、且つ、外層のトルクコイルの巻方向と内層のトルクコイルの巻方向とが逆である多条多層コイルから構成されている請求項7に記載の引っ掛け具。   In the first piece and the second piece, the inner surface of the outer-layer torque coil is in close contact with the outer surface of the inner-layer torque coil, and the winding direction of the outer-layer torque coil is opposite to the winding direction of the inner-layer torque coil. The hook according to claim 7, comprising a multi-layer multilayer coil. 請求項1に記載の引っ掛け具と、
前記引っ掛け具の第1の片の基端部に連繋される第1の操作部と、前記引っ掛け具の第2の片の基端部に連繋される第2の操作部とを備える医療用スネア。
A hook according to claim 1;
A medical snare including a first operation unit connected to a base end of a first piece of the hook and a second operation unit connected to a base of a second piece of the hook. .
前記第1、第2の各操作部を前記筒部材の長さ方向に沿って摺動自由に支持する操作本体部をさらに備える請求項9に記載の医療用スネア。   The medical snare according to claim 9, further comprising an operation main body that supports the first and second operation units so as to freely slide along a length direction of the tubular member. 請求項1に記載の引っ掛け具であって、
径方向に変形可能である中空のガイド部と、前記ガイド部内に長さ方向に沿って移動自在に挿入される可動片とを有する屈曲・伸展装置をさらに備え、
前記可動片は、前記ガイド部の長さ方向に沿って延び、互いに向き合う方向へ可撓性を有する第1、第2の帯状の可撓片と、前記第1、第2の可撓片の先端同士をつなぐ接続片とを含み、前記接続片及び前記ガイド部の端面に前記筒部材を通すための貫通孔が形成されている引っ掛け具。
It is a hook of Claim 1, Comprising:
The apparatus further includes a bending / extension device having a hollow guide portion that is deformable in a radial direction and a movable piece that is movably inserted into the guide portion along the length direction,
The movable piece extends along a length direction of the guide portion and has first and second strip-shaped flexible pieces having flexibility in directions facing each other. A hook including a connecting piece for connecting leading ends, and a through-hole for passing the cylindrical member through an end face of the connecting piece and the guide portion.
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