JP4566365B2 - Method for manufacturing flexible tube of endoscope or treatment tool for endoscope - Google Patents

Method for manufacturing flexible tube of endoscope or treatment tool for endoscope Download PDF

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Publication number
JP4566365B2
JP4566365B2 JP2000259445A JP2000259445A JP4566365B2 JP 4566365 B2 JP4566365 B2 JP 4566365B2 JP 2000259445 A JP2000259445 A JP 2000259445A JP 2000259445 A JP2000259445 A JP 2000259445A JP 4566365 B2 JP4566365 B2 JP 4566365B2
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Japan
Prior art keywords
flexible
endoscope
flexible tube
tube
flexible structure
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Expired - Fee Related
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JP2000259445A
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Japanese (ja)
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JP2002065591A (en
Inventor
輝雄 大内
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Hoya Corp
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Hoya Corp
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Description

【0001】
【発明の属する技術分野】
この発明は内視鏡又は内視鏡用処置具の可撓管及びその製造方法に関する。
【0002】
【従来の技術】
一般に、内視鏡又は内視鏡用処置具の可撓管の構成としては、屈曲自在であるが径方向には縮まない可撓性構造体の外面に、可撓性チューブ状の外皮が被覆されたものが少なくない。
【0003】
そのような可撓性構造体に外皮を被覆する方法として、次のような方法が知られている。
(1)可撓性構造体より少し細い径の可撓性チューブを、加圧空気等で膨らませた状態にして可撓性構造体に被覆する。
【0004】
(2)可撓性構造体より太い径の可撓性の熱収縮チューブを、加熱収縮させて可撓性構造体に被覆する。
(3)押し出し成形機を用い、溶解した合成樹脂素材を可撓性構造体に被覆して冷却する。
【0005】
【発明が解決しようとする課題】
しかし、(1)のように、可撓性チューブを可撓性構造体に被覆するために加圧空気等で膨らませる場合には、可撓性チューブを膨らませるための特別な設備を必要とするだけでなく、製造中に可撓性チューブがパンクしてしまう場合がある。
【0006】
また、(2)のように、熱収縮チューブを加熱収縮させて可撓性構造体に被覆する場合には、収縮によってチューブの肉厚が増加するので、薄い外皮の製造には向いておらず、また、全周を均等に加熱するのは難しいので、それによる肉厚のバラツキができて品質が不均一になり易い。
【0007】
また、(3)のように、押し出し成形を行う場合には、設備が非常に大がかりになり、可撓性構造体が耐熱性を有する場合しか被覆できないだけでなく、外皮の外径寸法が一定に成形されるので、可撓性構造体の外径が途中で変化したものや断面形状が異形の場合等には外皮の肉厚が各部で変化してしまい、外皮の肉厚を一定に成形することができない。
【0008】
そこで本発明は、特別な製造装置を用いることなく、しかも可撓性チューブを薄くて均一な肉厚に歩留りよく密着被覆して外皮とすることができる内視鏡又は内視鏡用処置具の可撓管及びその製造方法を提供することを目的とする。
【0009】
【課題を解決するための手段】
上記の目的を達成するため、本発明の内視鏡又は内視鏡用処置具の可撓管は、屈曲自在であるが径方向には縮まない可撓性構造体の外面に、可撓性チューブを塑性変形する状態に軸線方向に引き伸ばして縮径させた外皮を密着被覆したものである。
【0010】
また、本発明の内視鏡又は内視鏡用処置具の可撓管の製造方法は、可撓性構造体の外面に密着被覆された外皮が、可撓性構造体の外径より太い内径を有する可撓性チューブを、塑性変形する状態に軸線方向に引き伸ばすことにより縮径させて形成されているものであり、その後に、可撓性チューブを軟化点以上の温度に加熱してもよい。
【0011】
【発明の実施の形態】
図面を参照して本発明の実施例を説明する。
図3は、後述する可撓性チューブ7が被覆される前の内視鏡用生検鉗子を示している。
【0012】
内視鏡の処置具挿通チャンネルに挿通される可撓性シース1(可撓性構造体)は、ステンレス鋼線を一定の径で螺旋状に密着巻きしたコイルパイプによって形成されており、あらゆる方向に屈曲自在な可撓性を有するが、径方向には縮まない。
【0013】
ただし、可撓性シース1の先端付近の部分は、線径及び外径が細い軟性部1Aになっており、後端付近の部分は腰を強めるために第2の短いコイルパイプが外面に巻かれた折れ止め部1Bになっている。2は、コイルパイプどうしを接続する接続パイプである。
【0014】
可撓性シース1内には、軸線方向に進退自在に操作ワイヤ3が全長にわたって挿通配置されており、可撓性シース1の先端に固着された先端保持枠4には、一対の鉗子カップ5が支軸6を中心に嘴状に開閉自在に支持されている。
【0015】
10は、操作ワイヤ3を進退操作するための操作部であり、棒状の操作部本体11の先端部分に形成されたシース受け部13に、可撓性シース1の折れ止め部1Bの後端が連結されている。
【0016】
そして、操作ワイヤ3の後端が連結されたスライダー12を操作部本体11に沿って移動させることにより、操作ワイヤ3が軸線方向に進退して鉗子カップ5が開閉する。
【0017】
このような内視鏡用生検鉗子の可撓性シース1に、図8に示されるように、軟性部1A及び折れ止め部1Bも含めて薄い可撓性チューブからなる外皮7Aが被覆される。
【0018】
可撓性チューブ7としては、例えばポリウレタン樹脂チューブ、ポリエチレン樹脂チューブ、フッ素樹脂チューブ又は軟質塩化ビニル樹脂等のように、可撓性があって弾力性が小さい合成樹脂素材が用いられる。弾力性が大きいゴム系の素材は通さない。
【0019】
そのような材質の可撓性チューブ7は、図4に示されるように、指先等で摘んで軸線方向に引き伸ばす力を加えると、容易に塑性変形してスルスルと伸びて縮径し、同時に肉厚も薄くなる。
【0020】
その際、縮径部分7Aは全長に同時に形成されるのではなく、最初に伸びて縮径した部分を起点として広がっていく。したがって、図5に示されるように、可撓性チューブ7のごく一部分を引っ張って予め少しだけ伸ばしておくと、そこが縮径の起点になる。
【0021】
図6は、可撓性シース1を可撓性チューブ7に通した状態を示しており、可撓性チューブ7の内径寸法は、シース受け部13に被嵌される程度であり、被覆対象である可撓性シース1(軟性部1A、折れ止め部1B及び接続パイプ2を含む)のどの部分の外径寸法より大きい。
【0022】
次いで、図1に示されるように、可撓性チューブ7を指先等でシース受け部13部分に押し付け固定し、シース受け部13に隣接する折れ止め部1Bの後端部分に伸びの起点7Bを作ってから可撓性チューブ7を軸線方向に引き伸ばす。
【0023】
すると、可撓性チューブ7の縮径部分7Aが可撓性シース1の外面に密着する状態に縮径し、可撓性シース1の途中の外面に凸凹等があっても、ほぼ均一な肉厚で可撓性シース1の外面に密着していく。
【0024】
なお、図1に示される状態では、シース受け部13から遠く離れた位置で可撓性チューブ7を摘んで引っ張っているが、図2に示されるように可撓性チューブ7の中間部分を指先で摘み、その指先を滑らせるようにして可撓性チューブ7を引き伸ばしてもよい。
【0025】
このようにして、図7に示されるように、縮径した可撓性チューブ7Aをシース受け部13より先側の可撓性シース1の全長にわたって容易に被覆することができ、途中に太さや断面形状が変化する部分等があっても、それにかかわりなく素材チューブの肉厚より薄くてムラのない肉厚で被覆された外皮7Aとなる。
【0026】
そして最後に、図8に示されるように、軟性部1Aと折れ止め部1Bを含む可撓性シース1の両端において外皮7Aを切断し、必要に応じて接着や糸巻き緊縛等によって外皮7Aの両端を可撓性シース1に固定する。
【0027】
なお、外皮7Aが可撓性シース1に密着被覆された状態で、外皮7Aを軟化点以上に加熱すれば、可撓性チューブ7を塑性変形させて形成された外皮7Aの残留歪みを除去することができ、外皮7Aを可撓性シース1の表面に溶着させてもよい。
【0028】
外皮7Aを可撓性シース1の表面に加熱溶着させても、熱収縮チューブや押し出し成形の際に発生して問題となる肉厚の不均一が発生せず、可撓性シース1と外皮7Aとが全長において強く結合され、残留歪みも除去される。
【0029】
なお、本発明は上記実施例に限定されるものではなく、例えば可撓性チューブ7が被覆される可撓性シース1(可撓性構造体)が密着巻きコイルパイプ以外のものであっても差し支えない。
【0030】
また、図9に示されるように、本発明を内視鏡20の可撓管の外皮7Aに適用してもよく、その場合には、例えばステンレス鋼帯材製の螺旋管の周囲に網状管を被覆して形成された可撓性構造体21に、可撓性チューブ7を前述の生検鉗子の場合と同様にして被覆すればよい。21Bは折れ止め部、30は操作部である。
【0031】
【発明の効果】
本発明によれば、可撓性構造体より太い径を有する可撓性チューブを軸線方向に指先等で保持して引き伸ばすだけで、特別な製造装置を用いることなく、薄くて均一な肉厚の外皮を歩留りよく密着被覆することができ、可撓性構造体が熱に弱い部材であっても熱変形させずに被覆することができる。
【図面の簡単な説明】
【図1】本発明の実施例の可撓性チューブを引き伸ばす工程の側面断面図である。
【図2】本発明の実施例の可撓性チューブを引き伸ばす工程のチューブ保持位置を変えた例の側面断面図である。
【図3】本発明の実施例の外皮が被覆される前の内視鏡用生検鉗子の側面図である。
【図4】可撓性チューブが引き伸ばされる際の変化を例示する側面断面図である。
【図5】可撓性チューブを引き伸ばす際の最初の状態を例示する側面図である。
【図6】本発明の実施例の外皮被覆の最初の工程の側面断面図である。
【図7】本発明の実施例の外皮被覆終了時の状態の側面断面図である。
【図8】本発明の実施例の外皮が被覆されて完成した状態の内視鏡用生検鉗子の側面断面図である。
【図9】本発明を内視鏡の可撓管の外皮被覆に適用した場合の側面断面図である。
【符号の説明】
1 可撓性シース(可撓性構造体)
7 可撓性チューブ
7A 縮径部分(外皮)
21 可撓性構造体
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope or a flexible tube of an endoscope treatment tool and a method for manufacturing the same.
[0002]
[Prior art]
Generally, a flexible tube of an endoscope or an endoscope treatment tool is configured such that a flexible tube-like outer skin is coated on an outer surface of a flexible structure that can be bent but does not shrink in a radial direction. There are many things that have been done.
[0003]
The following methods are known as methods for coating the outer skin of such a flexible structure.
(1) A flexible tube having a diameter slightly smaller than that of the flexible structure is inflated with pressurized air or the like and covered with the flexible structure.
[0004]
(2) A heat-shrinkable flexible heat-shrinkable tube having a diameter larger than that of the flexible structure is coated on the flexible structure.
(3) Using an extrusion molding machine, the melted synthetic resin material is coated on a flexible structure and cooled.
[0005]
[Problems to be solved by the invention]
However, when the flexible tube is inflated with pressurized air or the like to cover the flexible structure as in (1), special equipment for inflating the flexible tube is required. In addition, the flexible tube may puncture during manufacturing.
[0006]
In addition, as in (2), when a heat-shrinkable tube is heated and shrunk and covered with a flexible structure, the thickness of the tube increases due to the shrinkage, so it is not suitable for the production of a thin skin. In addition, since it is difficult to heat the entire circumference uniformly, the thickness varies due to this, and the quality tends to be uneven.
[0007]
In addition, as shown in (3), when extrusion molding is performed, the equipment becomes very large and not only can be covered when the flexible structure has heat resistance, but also the outer diameter of the outer skin is constant. Therefore, if the outer diameter of the flexible structure is changed in the middle, or if the cross-sectional shape is irregular, etc., the thickness of the outer skin will change in each part, and the thickness of the outer skin will be fixed. Can not do it.
[0008]
Therefore, the present invention provides an endoscope or a treatment tool for an endoscope that can be used as an outer skin by using a thin and uniform wall with good yield and without using a special manufacturing apparatus. It aims at providing a flexible tube and its manufacturing method.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the flexible tube of the endoscope or the endoscope treatment tool of the present invention is flexible on the outer surface of the flexible structure that can be bent but does not shrink in the radial direction. The tube is tightly coated with an outer skin that is stretched in the axial direction and reduced in diameter in a plastically deformed state.
[0010]
Further, in the method for manufacturing a flexible tube of an endoscope or an endoscope treatment tool of the present invention, the outer skin that is tightly coated on the outer surface of the flexible structure has an inner diameter larger than the outer diameter of the flexible structure. The flexible tube having a diameter is reduced by stretching in the axial direction in a state of plastic deformation, and then the flexible tube may be heated to a temperature equal to or higher than the softening point. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 3 shows the endoscopic biopsy forceps before the flexible tube 7 described later is covered.
[0012]
A flexible sheath 1 (flexible structure) inserted into a treatment instrument insertion channel of an endoscope is formed by a coil pipe in which a stainless steel wire is tightly wound in a spiral shape with a constant diameter, and is in any direction. However, it does not shrink in the radial direction.
[0013]
However, the portion in the vicinity of the distal end of the flexible sheath 1 is a soft portion 1A having a thin wire diameter and outer diameter, and the second short coil pipe is wound around the outer surface in order to strengthen the waist in the portion near the rear end. The bent portion 1B is formed. Reference numeral 2 denotes a connection pipe for connecting coil pipes.
[0014]
An operation wire 3 is inserted through the entire length of the flexible sheath 1 so as to be movable back and forth in the axial direction, and a pair of forceps cups 5 are attached to the distal end holding frame 4 fixed to the distal end of the flexible sheath 1. Is supported so as to be openable and closable in a bowl shape around the support shaft 6.
[0015]
Reference numeral 10 denotes an operation unit for advancing and retracting the operation wire 3, and the rear end of the folding preventing portion 1 </ b> B of the flexible sheath 1 is attached to the sheath receiving portion 13 formed at the distal end portion of the rod-like operation unit main body 11. It is connected.
[0016]
Then, by moving the slider 12 connected to the rear end of the operation wire 3 along the operation unit main body 11, the operation wire 3 advances and retreats in the axial direction, and the forceps cup 5 opens and closes.
[0017]
As shown in FIG. 8, the flexible sheath 1 of the endoscopic biopsy forceps as described above is covered with a skin 7 </ b> A made of a thin flexible tube including the soft portion 1 </ b> A and the fold-preventing portion 1 </ b> B. .
[0018]
As the flexible tube 7, a synthetic resin material having flexibility and low elasticity, such as a polyurethane resin tube, a polyethylene resin tube, a fluorine resin tube, or a soft vinyl chloride resin, is used. Do not pass rubber-based materials with high elasticity.
[0019]
As shown in FIG. 4, the flexible tube 7 made of such a material is easily plastically deformed and stretched and reduced in diameter when it is picked with a fingertip or the like and stretched in the axial direction. The thickness also becomes thinner.
[0020]
At that time, the reduced diameter portion 7A is not formed in the entire length at the same time, but expands starting from the first expanded and reduced diameter portion. Therefore, as shown in FIG. 5, when a small portion of the flexible tube 7 is pulled and slightly stretched in advance, this becomes the starting point of the diameter reduction.
[0021]
FIG. 6 shows a state in which the flexible sheath 1 is passed through the flexible tube 7, and the inner diameter of the flexible tube 7 is such that it is fitted on the sheath receiving portion 13, It is larger than the outer diameter of any portion of a certain flexible sheath 1 (including the soft portion 1A, the bend preventing portion 1B, and the connection pipe 2).
[0022]
Next, as shown in FIG. 1, the flexible tube 7 is pressed and fixed to the sheath receiving portion 13 portion with a fingertip or the like, and an extension starting point 7B is formed at the rear end portion of the folding preventing portion 1B adjacent to the sheath receiving portion 13. After making, the flexible tube 7 is stretched in the axial direction.
[0023]
Then, even if the diameter-reduced portion 7A of the flexible tube 7 is reduced in diameter so as to be in close contact with the outer surface of the flexible sheath 1, and the outer surface in the middle of the flexible sheath 1 has irregularities or the like, the substantially uniform meat It is in close contact with the outer surface of the flexible sheath 1 with a thickness.
[0024]
In the state shown in FIG. 1, the flexible tube 7 is picked and pulled at a position far from the sheath receiving portion 13. However, as shown in FIG. 2, the intermediate portion of the flexible tube 7 is placed on the fingertip. And the flexible tube 7 may be stretched so that the fingertip is slid.
[0025]
In this way, as shown in FIG. 7, the flexible tube 7A having a reduced diameter can be easily covered over the entire length of the flexible sheath 1 on the front side of the sheath receiving portion 13, and the thickness or Even if there is a portion where the cross-sectional shape changes, the outer skin 7A is coated with a thickness that is thinner than the thickness of the material tube and has no unevenness.
[0026]
Finally, as shown in FIG. 8, the outer skin 7A is cut at both ends of the flexible sheath 1 including the soft portion 1A and the bend-preventing portion 1B, and both ends of the outer skin 7A are bonded, if necessary, by binding or spooling. Is fixed to the flexible sheath 1.
[0027]
In addition, if the outer skin 7A is heated to the softening point or more in a state where the outer skin 7A is tightly coated on the flexible sheath 1, residual strain of the outer skin 7A formed by plastic deformation of the flexible tube 7 is removed. The outer skin 7A may be welded to the surface of the flexible sheath 1.
[0028]
Even if the outer skin 7A is heated and welded to the surface of the flexible sheath 1, the thickness non-uniformity that occurs during the heat-shrinkable tube or extrusion molding does not occur, and the flexible sheath 1 and the outer skin 7A are not generated. Are strongly coupled in the entire length, and residual distortion is also removed.
[0029]
In addition, this invention is not limited to the said Example, For example, even if the flexible sheath 1 (flexible structure) by which the flexible tube 7 is coat | covered is other than a close winding coil pipe. There is no problem.
[0030]
Further, as shown in FIG. 9, the present invention may be applied to the outer shell 7A of the flexible tube of the endoscope 20. In that case, for example, a mesh tube is provided around a spiral tube made of stainless steel strip. The flexible tube 21 may be covered with the flexible tube 21 in the same manner as the biopsy forceps described above. Reference numeral 21B denotes a bend preventing part, and 30 denotes an operation part.
[0031]
【The invention's effect】
According to the present invention, a flexible tube having a diameter larger than that of the flexible structure is simply held and stretched with a fingertip or the like in the axial direction, and a thin and uniform wall thickness can be obtained without using a special manufacturing apparatus. The outer skin can be tightly coated with a good yield, and even if the flexible structure is a heat-sensitive member, it can be coated without being thermally deformed.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a step of stretching a flexible tube according to an embodiment of the present invention.
FIG. 2 is a side sectional view of an example in which the tube holding position is changed in the step of stretching the flexible tube according to the embodiment of the present invention.
FIG. 3 is a side view of an endoscopic biopsy forceps before the outer skin of the embodiment of the present invention is covered.
FIG. 4 is a side sectional view illustrating a change when the flexible tube is stretched.
FIG. 5 is a side view illustrating the initial state when the flexible tube is stretched.
FIG. 6 is a side cross-sectional view of the first step of covering the skin according to the embodiment of the present invention.
FIG. 7 is a side cross-sectional view of the embodiment of the present invention at the end of skin coating.
FIG. 8 is a side cross-sectional view of an endoscopic biopsy forceps in a state where the outer skin of the embodiment of the present invention is covered and completed.
FIG. 9 is a side cross-sectional view when the present invention is applied to a sheath of a flexible tube of an endoscope.
[Explanation of symbols]
1 Flexible sheath (flexible structure)
7 Flexible tube 7A Reduced diameter part (outer skin)
21 Flexible structure

Claims (2)

屈曲自在であるが径方向には縮まない可撓性構造体を被覆する外皮が、上記可撓性構造体の外径より太い内径を有する可撓性チューブを、加熱せずに軸線方向に引き伸ばすことにより縮径する状態に塑性変形させて上記可撓性構造体の外面に密着させ、その後に軟化点以上の温度に加熱して残留歪みを除去し、さらに上記可撓性構造体の表面に溶着させて形成されることを特徴とする内視鏡又は内視鏡用処置具の可撓管の製造方法 A flexible tube having an inner diameter thicker than the outer diameter of the flexible structure is pulled in the axial direction without heating. by plastically deforming brought into close contact with the outer surface of the flexible structure, and then the residual strain by heating to a temperature above the softening point to the removal to a state of reduced diameter by Succoth if Shin, further the flexible structure A method for manufacturing a flexible tube of an endoscope or a treatment instrument for an endoscope, wherein the flexible tube is formed by welding to the surface of the endoscope. 上記可撓性構造体の太さ又は断面形状が途中の部分で変化しており、その部分を含めて、上記外皮が上記可撓性構造体全体の表面に密着被覆される請求項1記載の内視鏡又は内視鏡用処置具の可撓管の製造方法。 The thickness or the cross-sectional shape of the flexible structure is changed at an intermediate portion, and the outer skin is tightly coated on the entire surface of the flexible structure including the portion. A method for manufacturing a flexible tube of an endoscope or an endoscope treatment tool.
JP2000259445A 2000-08-29 2000-08-29 Method for manufacturing flexible tube of endoscope or treatment tool for endoscope Expired - Fee Related JP4566365B2 (en)

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JP2005067039A (en) * 2003-08-25 2005-03-17 Seiko Epson Corp Tube fixing structure and liquid injection apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50136368A (en) * 1974-04-18 1975-10-29
JPH01291825A (en) * 1988-05-19 1989-11-24 Sumitomo Electric Ind Ltd Manufacture of intermediate product for endoscope catheter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50136368A (en) * 1974-04-18 1975-10-29
JPH01291825A (en) * 1988-05-19 1989-11-24 Sumitomo Electric Ind Ltd Manufacture of intermediate product for endoscope catheter

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