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JP4495276B2 - Endoscope snare - Google Patents

Endoscope snare Download PDF

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Publication number
JP4495276B2
JP4495276B2 JP24690899A JP24690899A JP4495276B2 JP 4495276 B2 JP4495276 B2 JP 4495276B2 JP 24690899 A JP24690899 A JP 24690899A JP 24690899 A JP24690899 A JP 24690899A JP 4495276 B2 JP4495276 B2 JP 4495276B2
Authority
JP
Japan
Prior art keywords
snare
snare loop
base end
flexible sheath
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP24690899A
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Japanese (ja)
Other versions
JP2001070314A (en
Inventor
知子 岩崎
喜好 神木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoya Corp
Original Assignee
Hoya Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to JP24690899A priority Critical patent/JP4495276B2/en
Publication of JP2001070314A publication Critical patent/JP2001070314A/en
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Publication of JP4495276B2 publication Critical patent/JP4495276B2/en
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Expired - Fee Related legal-status Critical Current

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Description

【0001】
【発明の属する技術分野】
この発明は、内視鏡の処置具挿通チャンネルに通されてポリープを切除するために用いられる内視鏡用スネアに関する。
【0002】
【従来の技術】
内視鏡用スネアは一般に、可撓性シース内に軸線方向に進退自在に操作ワイヤを挿通配置して、その操作ワイヤの先端に弾性ワイヤからなるスネアループを連結し、操作ワイヤを軸線方向に進退操作することによりスネアループが可撓性シースの先端内に出入りして、スネアループが可撓性シース外では自己の弾性によって膨らみ、可撓性シース内に引き込まれることによって窄まるようになっている。
【0003】
図5は、そのような従来の内視鏡用スネアを示しており、使用後の洗浄消毒時等には、操作ワイヤ91とスネアループ92とが一体に連結されたユニットを可撓性シース93から抜去することができるようになっている。スネアループ92の先端部分92aでは、弾性ワイヤが小さなU字状に曲げ戻されている。
【0004】
内視鏡用スネアを洗浄消毒後に再び使用する際には、スネアループ92を、可撓性シース93の基端に配置された基端挿入部材94,95に先端から差し込み、そのまま可撓性シース93内に押し込んで組み立てるようになっている。
【0005】
【発明が解決しようとする課題】
図6は、基端挿入部材94,95内にスネアループ92を挿入している状態を示しており、スネアループ92を窄めて基端挿入部材94,95内に押し込んで行くのであるが、スネアループ92の先端曲げ戻し部92aが基端挿入部材94,95の孔の内面で擦られ、スネアループ92を形成している弾性ワイヤの素線がほつれて損傷してしまう場合が少なくなかった。
【0006】
そこで本発明は、洗浄消毒後の再組み立て時等に、スネアループをシースの基端に配置された基端挿入部材に円滑に差し込んで、容易に組み立てを行うことができる内視鏡用スネアを提供することを目的とする。
【0007】
【課題を解決するための手段】
上記の目的を達成するため、本発明の内視鏡用スネアは、シース内に軸線方向に進退自在に操作ワイヤを挿通配置して、一本の弾性ワイヤを曲げて形成したスネアループを操作ワイヤの先端に連結し、操作ワイヤを軸線方向に進退操作することによりスネアループが可撓性シースの先端内に出入りして、スネアループが可撓性シース外では自己の弾性によって膨らみ、可撓性シース内に引き込まれることによって窄まるようにした内視鏡用スネアであって、シースの基端に連結された基端挿入部材の孔にスネアループを先端から挿入して組み立てるようにしたものにおいて、スネアループの先端部分を、外面の径が基端挿入部材の孔径より小さく、且つ内面の径が弾性ワイヤの径以上の大きさのカーブで曲げ戻したものである。
【0008】
なお、スネアループの先端部分は、先の丸まったV字状に曲げ戻してもよく、要は略U字状に曲げ戻されていればよい。
【0009】
【発明の実施の形態】
図面を参照して本発明の実施の形態を説明する。
図2は、本発明の実施の形態の内視鏡用スネアを示しており、1は、例えば電気絶縁性の四フッ化エチレン樹脂製チューブ等からなる可撓性シースであり、図示されていない内視鏡の処置具挿通チャンネルに挿脱される。
【0010】
可撓性シース1内には、可撓性のある導電性金属製の操作ワイヤ2が全長にわたって軸線方向に進退自在に挿通されており、図示されていない操作部によって基端側(図2において右方)から任意に進退操作される。
【0011】
操作ワイヤ2の先端部分には、導電性の弾性ワイヤからなるスネアループ3が接続パイプ4を介して連結されている。ただし、スネアループ3を延長して操作ワイヤ2を形成してもよい。
【0012】
スネアループ3を形成する弾性ワイヤは、ステンレス鋼線の撚り線(例えば直径0.06mmの素線を19本撚った1×19撚りの直径0.3mmのワイヤ)によって形成されており、外力が加えられていない状態では、図2に示されるように数センチメートルの広がりのループを形成しており、外力を加えることによって弾性変形させて窄ませることができる。
【0013】
したがって、操作ワイヤ2を基端側から進退操作すると、スネアループ3が可撓性シース1の先端内に出入りして、スネアループ3が、可撓性シース1外では図2に示されるように自己の弾性によってループ状に膨らみ、可撓性シース1内に引き込まれることによって窄まる。
【0014】
可撓性シース1の基端には基端口金10が連結されている。また、操作ワイヤ2の基端側の部分は、可撓性シース1内から基端口金10内を通って、そこから手元側に延び出しているステンレスロッド20に連結されている。基端口金10の側部には、可撓性シース1内に連通する注射筒受け口金11が突設されている。
【0015】
図3は、内視鏡用スネアを使用した後の洗浄消毒の際等に、操作ワイヤ2が抜き去られた状態の基端口金10付近を示しており、可撓性シース1の基端は、基端口金10に螺合する押さえネジ12によって基端口金10の先端部分に押圧固定されている。13は、折れ止めチューブである。
【0016】
基端口金10の他端側には、可撓性シース1の軸線の延長線上に、基端挿入筒14が突設されている。基端挿入筒14は、一体に固着連結された基端挿入ネジ筒15が基端口金10にねじ込まれることにより基端口金10に取り付けられており、基端挿入ネジ筒15のねじ込み量を加減することにより、シール用Oリング16の潰し量を調整することができるようになっている。
【0017】
したがって、基端挿入筒14と基端挿入ネジ筒15とは本来一部品として形成されてよいものであり、基端挿入筒14と基端挿入ネジ筒15とが本発明の基端挿入部材に該当する。ただし、Oリング16がなければ、基端口金10自体を基端挿入部材にしてもよい。
【0018】
これら、基端口金10、基端挿入ネジ筒15及び基端挿入筒14には、可撓性シース1の内径とほぼ同寸法の貫通孔が可撓性シース1に真っ直ぐに連通する位置に形成されていて、それらの内部を操作ワイヤ2が通過する。
【0019】
図4は、スネアループ3の部分を拡大して示しており、先端部分3aは略U字状に曲げ戻されていて、後方へ徐々に広がっているので、先の丸まったV字状に曲げ戻されているということができる。ただしU字状等であっても差し支えない。
【0020】
スネアループ3の先端部分3aは、外面3aoの径が基端挿入部材14,15の孔径より小さく、且つ内面3aiの径がスネアループ3を形成する弾性ワイヤの径以上の大きさのカーブで曲げ戻されている。
【0021】
そのようにスネアループ3の先端部分3aの外面3aoの径が基端挿入部材14,15の孔径より小さく形成されていることにより、図1に示されるように、洗浄消毒終了後等の組み立てを行うためにスネアループ3をその先端側から基端挿入部材14,15の孔に差し込む際には、スネアループ3が窄められることによって先端部分3aが基端挿入部材14,15の孔壁面に引っ掛かることなく、スムーズに挿入される。
【0022】
また、スネアループ3の先端部分3aの内面3aiの径がスネアループ3を形成する弾性ワイヤの径以上の大きさに形成されていることから、先端部分3aにおいてスネアループ3が急激に曲げられず、素線切れ等の耐久上の問題が発生しない。
【0023】
【発明の効果】
本発明によれば、スネアループの先端部分を、外面の径が基端挿入部材の孔径より小さく、且つ内面の径が弾性ワイヤの径以上の大きさのカーブで曲げ戻したことにより、洗浄消毒後の再組み立て時等に、素線切れ等の耐久上の問題を起こすことなくスネアループをシースの基端に配置された基端挿入部材に円滑に差し込んで、容易に組み立てを行うことができる。
【図面の簡単な説明】
【図1】本発明の実施の形態の内視鏡用スネアの組み立て時の部分拡大側面断面図である。
【図2】本発明の実施の形態の内視鏡用スネアの側面図である。
【図3】本発明の実施の形態の内視鏡用スネアのシースの基端側部分の側面断面図である。
【図4】本発明の実施の形態の内視鏡用スネアの先端部分の拡大側面図である。
【図5】従来の内視鏡用スネアの側面図である。
【図6】従来の内視鏡用スネアの組み立て時の部分拡大側面断面図である。
【符号の説明】
1 可撓性シース
2 操作ワイヤ
3 スネアループ
3a 先端部分
10 基端口金
14 基端挿入筒(基端挿入部材)
15 基端挿入ネジ筒(基端挿入部材)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope snare that is used to cut a polyp through a treatment instrument insertion channel of an endoscope.
[0002]
[Prior art]
In general, a snare for an endoscope has an operation wire inserted through a flexible sheath so as to be movable back and forth in the axial direction, a snare loop made of an elastic wire is connected to the tip of the operation wire, and the operation wire is moved in the axial direction. The snare loop moves in and out of the distal end of the flexible sheath by advancing and retracting, and the snare loop swells by its own elasticity outside the flexible sheath and becomes constricted by being pulled into the flexible sheath. ing.
[0003]
FIG. 5 shows such a conventional endoscopic snare. At the time of cleaning and disinfection after use, a unit in which the operation wire 91 and the snare loop 92 are integrally connected is connected to the flexible sheath 93. It can be removed from. At the tip end portion 92a of the snare loop 92, the elastic wire is bent back into a small U shape.
[0004]
When the snare for the endoscope is used again after cleaning and disinfection, the snare loop 92 is inserted from the distal end into the proximal end insertion members 94 and 95 disposed at the proximal end of the flexible sheath 93, and the flexible sheath is left as it is. It is designed to be pushed into 93 and assembled.
[0005]
[Problems to be solved by the invention]
FIG. 6 shows a state in which the snare loop 92 is inserted into the proximal end insertion members 94, 95. The snare loop 92 is narrowed and pushed into the proximal end insertion members 94, 95. There are many cases where the bent end portion 92a of the snare loop 92 is rubbed against the inner surface of the hole of the base end insertion member 94, 95 and the strand of the elastic wire forming the snare loop 92 is frayed and damaged. .
[0006]
Therefore, the present invention provides an endoscope snare that can be easily assembled by smoothly inserting a snare loop into a proximal end insertion member disposed at the proximal end of a sheath at the time of reassembly after cleaning and disinfection. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope snare according to the present invention has a snare loop formed by inserting and arranging an operation wire in a sheath so as to be movable forward and backward in the axial direction, and bending one elastic wire. The snare loop enters and exits the distal end of the flexible sheath by operating the operation wire in the axial direction, and the snare loop is swollen by its own elasticity outside the flexible sheath. An endoscopic snare that is narrowed by being pulled into the sheath and assembled by inserting a snare loop from the distal end into the hole of the proximal end insertion member connected to the proximal end of the sheath. The tip portion of the snare loop is bent back with a curve whose outer surface diameter is smaller than the hole diameter of the proximal insertion member and whose inner surface diameter is larger than the diameter of the elastic wire.
[0008]
Note that the tip portion of the snare loop may be bent back into a rounded V-shape, and in short, it may be bent back into a substantially U-shape.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an endoscopic snare according to an embodiment of the present invention. Reference numeral 1 denotes a flexible sheath made of, for example, an electrically insulating tetrafluoroethylene resin tube, which is not shown. It is inserted into and removed from the treatment instrument insertion channel of the endoscope.
[0010]
A flexible conductive metal operation wire 2 is inserted through the entire length of the flexible sheath 1 so as to be able to advance and retract in the axial direction over the entire length thereof. Advancing / retreating is arbitrarily performed from the right).
[0011]
A snare loop 3 made of a conductive elastic wire is connected to the distal end portion of the operation wire 2 via a connection pipe 4. However, the operation wire 2 may be formed by extending the snare loop 3.
[0012]
The elastic wire forming the snare loop 3 is formed by a stranded wire of stainless steel wire (for example, a 1 × 19 stranded wire having a diameter of 0.3 mm obtained by twisting 19 strands having a diameter of 0.06 mm). In a state where no is applied, a loop having a spread of several centimeters is formed as shown in FIG. 2, and it can be elastically deformed and constricted by applying an external force.
[0013]
Therefore, when the operation wire 2 is advanced and retracted from the proximal end side, the snare loop 3 enters and exits the distal end of the flexible sheath 1, and the snare loop 3 is outside the flexible sheath 1 as shown in FIG. It swells in a loop shape due to its own elasticity, and is narrowed by being drawn into the flexible sheath 1.
[0014]
A proximal end cap 10 is connected to the proximal end of the flexible sheath 1. Further, the proximal end portion of the operation wire 2 is connected to a stainless rod 20 extending from the flexible sheath 1 through the proximal end cap 10 to the proximal side. At the side portion of the base end cap 10, a syringe barrel receiving cap 11 that projects into the flexible sheath 1 is projected.
[0015]
FIG. 3 shows the vicinity of the base end cap 10 in a state where the operation wire 2 has been removed during cleaning and disinfection after using the endoscope snare, and the base end of the flexible sheath 1 is shown in FIG. The base end cap 10 is pressed and fixed to the distal end portion of the base end cap 10 by a holding screw 12 screwed into the base end cap 10. Reference numeral 13 denotes a bend preventing tube.
[0016]
On the other end side of the base end cap 10, a base end insertion cylinder 14 projects from the extension line of the axis of the flexible sheath 1. The base end insertion tube 14 is attached to the base end cap 10 by screwing a base end insertion screw tube 15 fixedly connected together into the base end cap 10, and the screwing amount of the base end insertion screw tube 15 is adjusted. By doing so, the crushing amount of the sealing O-ring 16 can be adjusted.
[0017]
Therefore, the base end insertion tube 14 and the base end insertion screw tube 15 may be originally formed as one component, and the base end insertion tube 14 and the base end insertion screw tube 15 are the base end insertion member of the present invention. Applicable. However, if the O-ring 16 is not provided, the base end cap 10 itself may be a base end insertion member.
[0018]
In the base end cap 10, the base end insertion screw cylinder 15, and the base end insertion cylinder 14, a through hole having substantially the same size as the inner diameter of the flexible sheath 1 is formed at a position that communicates with the flexible sheath 1 in a straight line. Then, the operation wire 2 passes through them.
[0019]
FIG. 4 shows an enlarged portion of the snare loop 3, and the tip portion 3a is bent back in a substantially U shape and gradually spreads backward, so that it is bent into a rounded V shape. It can be said that it has been returned. However, it may be U-shaped.
[0020]
The distal end portion 3 a of the snare loop 3 is bent with a curve whose outer surface 3 ao is smaller in diameter than the hole diameters of the proximal insertion members 14 and 15 and whose inner surface 3 ai is larger than the diameter of the elastic wire forming the snare loop 3. It has been returned.
[0021]
Since the diameter of the outer surface 3ao of the distal end portion 3a of the snare loop 3 is formed smaller than the hole diameter of the base end insertion members 14 and 15, as shown in FIG. When the snare loop 3 is inserted into the holes of the proximal insertion members 14 and 15 from the distal end side thereof, the distal portion 3a is brought into contact with the hole wall surfaces of the proximal insertion members 14 and 15 when the snare loop 3 is narrowed. Inserts smoothly without being caught.
[0022]
Further, since the diameter of the inner surface 3ai of the tip portion 3a of the snare loop 3 is formed to be larger than the diameter of the elastic wire forming the snare loop 3, the snare loop 3 is not suddenly bent at the tip portion 3a. , Durability problems such as wire breakage do not occur.
[0023]
【The invention's effect】
According to the present invention, the distal portion of the snare loop is bent back with a curve whose outer surface diameter is smaller than the hole diameter of the proximal insertion member and whose inner surface diameter is equal to or larger than the diameter of the elastic wire. When reassembling later, the snare loop can be smoothly inserted into the proximal end insertion member arranged at the proximal end of the sheath without causing any durability problems such as wire breakage. .
[Brief description of the drawings]
FIG. 1 is a partially enlarged side cross-sectional view of an endoscope snare according to an embodiment of the present invention when assembled.
FIG. 2 is a side view of the endoscope snare according to the embodiment of the present invention.
FIG. 3 is a side sectional view of a proximal end side portion of the sheath of the endoscope snare according to the embodiment of the present invention.
FIG. 4 is an enlarged side view of the distal end portion of the endoscope snare according to the embodiment of the present invention.
FIG. 5 is a side view of a conventional endoscopic snare.
FIG. 6 is a partially enlarged side cross-sectional view when assembling a conventional endoscope snare.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Operation wire 3 Snare loop 3a Tip part 10 Base end cap 14 Base end insertion cylinder (base end insertion member)
15 Base end insertion screw cylinder (base end insertion member)

Claims (3)

可撓性シース内に軸線方向に進退自在に操作ワイヤを挿通配置して、一本の弾性ワイヤを曲げて形成したスネアループを上記操作ワイヤの先端に連結し、上記操作ワイヤを軸線方向に進退操作することにより上記スネアループが上記可撓性シースの先端内に出入りして、上記スネアループが上記可撓性シース外では自己の弾性によって膨らみ、上記可撓性シース内に引き込まれることによって窄まるようにした内視鏡用スネアにおいて、
上記可撓性シースの基端に連結された基端口金に、上記可撓性シースに真っ直ぐに通じる貫通孔が形成された基端挿入部材をねじ込んで取り付け、そのねじ込み量を加減することにより、上記基端口金側と上記基端挿入部材側との間に挟み付けられた状態に配置されたシール用Oリングの潰し量を調整することができるように構成すると共に、
上記基端挿入部材に形成された貫通孔の長さを、窄まった状態における上記スネアループの長さより長く形成し、上記スネアループの先端部分を、外面の径が上記基端挿入部材の貫通孔の孔径より小さく、且つ内面の径が上記弾性ワイヤの径以上の大きさのカーブで曲げ戻したことを特徴とする内視鏡用スネア。
An operation wire is inserted and arranged in the flexible sheath so as to be able to advance and retract in the axial direction, a snare loop formed by bending one elastic wire is connected to the tip of the operation wire, and the operation wire is advanced and retracted in the axial direction. By operating, the snare loop enters and exits into the distal end of the flexible sheath, and the snare loop swells by its own elasticity outside the flexible sheath and is retracted by being pulled into the flexible sheath. In an endoscopic snare,
By screwing and attaching a base end insertion member formed with a through hole that leads straight to the flexible sheath to the base end cap connected to the base end of the flexible sheath, and adjusting the screwing amount, While being configured to be able to adjust the crushing amount of the sealing O-ring arranged in a state of being sandwiched between the base end cap side and the base end insertion member side,
The length of the through hole formed in the proximal end insertion member is longer than the length of the snare loop in the constricted state , and the distal end portion of the snare loop has an outer surface diameter penetrating the proximal end insertion member. An endoscopic snare characterized by being bent back by a curve having a diameter smaller than the diameter of the hole and having an inner diameter equal to or larger than the diameter of the elastic wire.
上記スネアループの先端部分が、先の丸まったV字状に曲げ戻されている請求項1記載の内視鏡用スネア。The snare for an endoscope according to claim 1, wherein a tip portion of the snare loop is bent back into a rounded V shape. 上記スネアループの先端部分が、略U字状に曲げ戻されている請求項1記載の内視鏡用スネア。The snare for an endoscope according to claim 1, wherein a tip portion of the snare loop is bent back into a substantially U shape.
JP24690899A 1999-09-01 1999-09-01 Endoscope snare Expired - Fee Related JP4495276B2 (en)

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JP2001070314A JP2001070314A (en) 2001-03-21
JP4495276B2 true JP4495276B2 (en) 2010-06-30

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