JP3727407B2 - Catheter tube - Google Patents

Description

【００５４】
以上に示すように、実施例１のカテーテルチューブは、比較例１のカテーテルチューブに比べて、１０倍以上牽引回数が上回っており、牽引ワイヤーの破断耐久性にきわめて優れていることが確認された。
【００５５】
【発明の効果】
以上述べたように、本発明のカテーテルは、チューブ本体と、該チューブ本体のほぼ全長に渡って形成された少なくとも一つのルーメンと、前記チューブ本体の先端部を残して、前記ルーメン内に前記チューブ本体の長手方向に移動不能に配置された少なくとも一つの密巻きコイルと、先端部が前記チューブ本体の先端付近に止着され、前記密巻きコイル内に配置された少なくとも一つの牽引ワイヤーと、該牽引ワイヤーを前記チューブ本体の基端方向へ牽引しうる牽引具とを有し、前記牽引ワイヤーを前記チューブ本体の基端方向へ牽引することにより、前記チューブ本体の前記先端部が湾曲するように構成されたカテーテルチューブであって、前記密巻きコイルの先端近傍の内面が、前記密巻きコイルの先端に向かって拡がった形状をなす傾斜面となっており、前記傾斜面の前記チューブ本体の長軸に対する角度が２０°〜６０°であることを特徴とするため、密巻きコイルと牽引ワイヤーとの間の摩擦を低減でき、したがって、湾曲操作時の牽引ワイヤーの破断耐久性を向上できる。
【図面の簡単な説明】
【図１】本発明のカテーテルチューブを内視鏡を構成するカテーテルチューブに適用した場合の実施例を示す全体側面図である。
【図２】図１に示すカテーテルチューブの先端部の構成を示す斜視図である。
【図３】図２中のIII −III 線断面図である。
【図４】図２中のIV−IV線断面図である。
【図５】図４中のＶ−Ｖ線断面図である。
【図６】図４中のVI−VI線断面図である。
【図７】図４に示す密巻きコイルの先端部の拡大縦断面図である。
【符号の説明】
１ カテーテルチュープ
２ チューブ本体
２１ 屈曲部
２２ 中間部
２３ 基端部
２４ 境界部
３ 先端部
４１ 第一のルーメン
４２ 第二のルーメン
４３ 第三のルーメン
４４ 第四のルーメン
５１，５２ 牽引ワイヤー
５３，５４ 充填材
６ 密巻きコイル
６１ 先端
６２ 傾斜面
７ 光ファイパー束
７１ 送光用ファイバー
７２ 受光用ファイバー
７３ レンズ
８ 操作具
８１ 操作具本体
８２ マニホールド部
８３ 把持部
８４ コネクタ
８５ コネクタ
８６ 操作ダイヤル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a catheter tube that is used by being inserted into a body cavity such as a heart, blood vessel, pancreatic tract, digestive tract, urethra, and abdominal cavity, and performs observation of an insertion site and medical treatment.
[0002]
[Prior art]
In a catheter tube used by being inserted into a body cavity, a catheter having a bending mechanism (swing mechanism) at the distal end in order to direct the distal end of the catheter tube toward the intended portion or to be positioned at the intended portion Tubes have been developed. In particular, in the field of endoscope, the bending mechanism is one of important mechanisms for the purpose of securing a target visual field.
[0003]
In recent years, a bending mechanism having a structure that does not use a node ring has been devised as the diameter of an endoscope is reduced. One of them is a catheter tube having a structure in which a closely wound flat plate coil is arranged and fixed in a lumen in a non-curved portion of a multi-lumen tube, and a pulling wire is arranged in the coil. In this case, the densely wound coil is fixed to the multi-lumen tube at two locations near the boundary between the curved portion and the non-curved portion and at the proximal side (base end side). Thus, the non-curved portion of the multi-lumen tube does not contract when the tightly wound coil is fixed to the non-curved portion in an immovable state when the pulling wire is pulled in the proximal direction. Therefore, the non-curved portion does not bend even when a pulling operation is performed.
[0004]
[Problems to be solved by the invention]
However, in such a catheter tube, the inner surface and the distal end surface are relatively flat at the distal end portion of the closely wound flat plate coil, and the inner side of the distal end of the coil is angular. There is a risk that the pulling wire may be broken.
[0005]
The present invention has been made in view of the above points, and is a catheter having a distal end bending function in which friction between a closely wound coil tip and a pulling wire is reduced and the pulling wire has excellent fracture durability. The object is to provide a tube.
[0006]
[Means for Solving the Problems]
Such an object is achieved by the present invention described in (1) below.
[0007]
(1) A tube main body, at least one lumen formed over substantially the entire length of the tube main body, and a distal end portion of the tube main body are left so as to be immovable in the longitudinal direction of the tube main body in the lumen. At least one tightly wound coil, at least one traction wire secured to the vicinity of the distal end of the tube body, and disposed in the densely wound coil; and the traction wire connected to the proximal end of the tube body A catheter tube configured to bend the distal end portion of the tube main body by pulling the pulling wire in the proximal direction of the tube main body. The inner surface in the vicinity of the tip of the densely wound coil is an inclined surface having a shape expanding toward the tip of the densely wound coil. Catheter tube angle relative to the longitudinal axis of the serial tube body is characterized by a 20 ° to 60 °.
[0008]
Here, the shape of the inclined surface in the vicinity of the tip of the densely wound coil may be a shape that expands toward the tip of the coil as a whole, and has a tapered shape that expands at a uniform rate toward the tip of the coil. In addition, although it has fine irregularities, it may have a shape whose diameter is increased toward the tip of the coil as a whole.
[0009]
Further, the densely wound coil is preferably a flat coil from the viewpoint that the thickness of the coil can be reduced and the tube body can be made thinner.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
[0011]
FIG. 1 is an overall side view showing an embodiment in which the catheter tube of the present invention is applied to a catheter tube constituting an endoscope (fiber scrub), and FIG. 2 is a view of the distal end portion of the catheter tube shown in FIG. 3 is a longitudinal sectional view taken along line III-III in FIG. 2, FIG. 4 is a longitudinal sectional view taken along line IV-IV in FIG. 2, and FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 4, and FIG. 7 is an enlarged vertical cross-sectional view of the tip of the closely wound coil shown in FIG. In the following description, the right side in FIGS. 1 to 4 is referred to as “base end”, and the left side is referred to as “tip”.
[0012]
As shown in FIGS. 1 to 6, the catheter tube 1 of the present invention has a tube body 2. The tube main body 2 has such flexibility that the bent portion 21 can be easily bent when the pulling wires 51 and 52 described later are pulled in the proximal direction, for example, soft polyvinyl chloride. , Polyethylene, polypropylene, polyurethane, polyamide, polytetrafluoroethylene, silicone rubber, and a polymer material having flexibility such as an ethylene-vinyl acetate copolymer.
[0013]
Further, in order to make it possible to confirm the catheter tube 1 under X-ray fluoroscopy, it is preferable to impart X-ray contrast properties to the tube body 2, for example, in the constituent material of the tube body 2. For example, a method of blending X-ray opaque material such as barium sulfate, bismuth oxide, tungsten, etc., a method of embedding or adhering a marker with such X-ray opaque material to the surface, and the like.
[0014]
Moreover, in order to improve the slidability with respect to the inserted body cavity or the like, for example, a hydrophilic polymer (eg, maleic anhydride copolymer) or a fluorine resin (eg, polytetrafluoroethylene) is formed on the outer surface of the tube body 2. Such a low friction material may be coated.
[0015]
A bending portion 21 that is bent or curved by a wire pulling operation described later is formed on the distal end side of the tube body 2, and an operation tool 8 that performs the bending operation of the bending portion 21 is installed at the proximal end portion 23 of the tube. Has been. An intermediate portion 22 is formed between the bent portion 21 and the base end portion 23 of the tube main body 2. The intermediate portion 22 is flexible enough to bend following the bending or bending of the tubular organ when the catheter tube 1 is inserted into a tubular organ such as a blood clot or pancreatic duct. It is configured not to be bent by a wire pulling operation described later.
[0016]
A first lumen 41, a second lumen 42, a third lumen 43 and a fourth lumen 44 are formed in the tube body 2 over substantially the entire length in the longitudinal direction.
[0017]
The distal end of the first lumen 41 is open to the distal end portion 3 of the tube body 2, and the optical fiber bundle 7 as an observation instrument for observing the inside of the tubular organ into which the catheter tube 1 is inserted is provided in the first lumen 41. It is stored. The optical fiber bundle 7 can also be used for medical treatment such as irradiating the inner wall of the tubular organ with laser light.
[0018]
As shown in FIG. 5, the optical fiber bundle 7 includes a light transmitting fiber (light guide) 71 and a light receiving fiber (image fiber) 72. These optical fibers are made of a resin such as epoxy, acrylic, silicone rubber or the like. It is hardened and bundled.
[0019]
The light transmitting fiber 71 and the light receiving fiber 72 are made of optical fibers made of quartz, multicomponent glass, plastics, or the like.
[0020]
A lens 73 that collects the reflected light from the observation site is attached to the tip of the optical fiber bundle 7, and this portion is located near the opening at the tip of the lumen 41. The optical fiber bundle 7 is preferably fixedly installed with respect to the lumen 41, but is slidable with respect to the lumen 41, so that the distal end portion of the optical fiber bundle 7 can be projected and retracted from the distal end opening of the lumen 41. You can also.
[0021]
Light emitted from a light source (not shown) on the base end side (right side in FIG. 1) of the operation tool 8 is transmitted through the light transmitting fiber 71 and irradiated from the tip to the observation portion, and the reflected light is reflected by the lens 73. The light is condensed and taken in from the distal end of the light receiving fiber 72, and the image is transmitted through the fiber 72 and guided to an image receiving portion (not shown) on the proximal end side of the operation tool 8.
[0022]
When the optical fiber bundle 7 is not fixedly installed with respect to the lumen 41, the fluid is injected into the tubular organ using the gap between the lumen 41 and the optical fiber bundle 7, or the fluid is sucked from the tubular organ. Can do. Specifically, the lumen 41 is used to administer a drug solution or the like into the tubular organ into which the catheter tube 1 is inserted and placed, or when the inside of the tubular organ is observed with an endoscope, the visibility is obstructed. It can also be used as a flush channel for injecting a transparent liquid (for example, physiological saline, glucose solution) for extruding body fluid such as blood and bile.
[0023]
The second lumen 42 is opened at the distal end portion 3 of the catheter tube 1 and is used as an insertion channel for a guide wire, various medical treatment tools, diagnostic tools, and the like. For example, an optical fiber bundle is stored in the second lumen 42. Then, it is possible to perform a therapeutic action such as irradiating a laser beam through the optical fiber bundle to crush the calculus. Examples of the medical treatment / diagnostic tool include forceps, cytodiagnosis brushes, injection needles, high-frequency, ultrasonic waves, electric hydraulic shock waves, and other probes (for lithotripsy), various sensors, and their conductors. .
[0024]
In addition, a fluid such as blood can be sucked from the inside of a blood vessel or the like by injecting a fluid into a blood vessel or a tubular organ from the distal end opening of the second lumen 42. Specifically, the second lumen 42 is used to administer a drug solution into a blood vessel or tubular organ in which the catheter tube 1 is inserted and placed, or the inside of the blood vessel or tubular organ is observed by the optical fiber bundle 7. In this case, it is also used as a flush channel for ejecting a transparent liquid (for example, physiological saline or glucose solution) for extruding a body fluid that hinders the visual field.
[0025]
In the third lumen 43 and the fourth lumen 44, the tightly wound coil 6 that prevents the bending of the intermediate portion 22 and the base end portion 23 during the bending operation of the bending portion 21, and the bending of the tube body 2, respectively. Pulling wires 51 and 52 for bending the portion 21 are accommodated, respectively.
[0026]
The distal end portion of each closely wound coil 6 is inserted to the vicinity of the boundary portion 24 between the bent portion 21 and the intermediate portion 22 of the tube main body 2, and is fixed at the boundary portion 24. That is, when the outer peripheral surface of the boundary portion 24 is heated and pressurized (clamped) in a state of being covered with, for example, a heat shrinkable tube (not shown), the material of the tube body 2 is melted or softened, and the lumens of the lumens 43 and 44 The inner wall surface of the outer periphery of the tube body of the lumens 43 and 44 is deformed so as to protrude inward, and is pressed against and closely adhered to the outer peripheral surface of each closely wound coil 6. 6 is fixed to the lumens 43 and 44.
[0027]
The fixing of the tip end portion of the closely wound coil 6 is not limited to the above method. For example, an adhesive (filler) or the like connects the inner surfaces of the lumens 43 and 44 and the outer peripheral surface of each anti-shrink member 6 at the boundary portion 24. For example, a method of adhering with each other, a method of fastening and fixing each closely wound coil 6 by caulking with a caulking member, or the like may be employed.
[0028]
The proximal end portions (not shown) of the lumens 43 and 44 of each closely wound coil 6 are also fixed at the proximal end portion 23 of the tube body 2 in the same manner as the distal end portion. Thereby, even if the pulling wires 51 and 52 described later are pulled, the tightly wound coil 6 does not move in the lumens 43 and 44 due to the pulling, and only the bent portion 21 can be bent reliably. .
[0029]
In addition, the location where the densely wound coil 6 is fixed to the lumens 43 and 44 is not limited to the distal end portion and the proximal end portion. For example, the middle portion of the closely wound coil 6 may be fixed. Is too large, the flexibility of the densely wound coil 6 is impaired. Therefore, it is preferable that the densely wound coil 6 is fixed at about two places, the distal end portion and the proximal end portion as described above.
[0030]
As shown in an enlarged view in FIG. 7, an inclined surface 62 is formed on the inner surface in the vicinity of the tip 61 of the closely wound coil 6, and the inner surface of the closely wound coil 6 is tapered toward the tip. The diameter is expanded, in other words, the shape is expanded toward the tip 61 of the closely wound coil 6. As a result, when the pulling wires 51 and 52 described later are pulled to the proximal end side, the pulling wires 51 and 52 come into contact with the inner surface in the vicinity of the distal end 61 of the closely wound coil 6, but the inner surface becomes the inclined surface 62. In addition, since there is no angular beam on the inner side of the tip 61 of the closely wound coil 6, the friction between the pulling wires 51 and 52 and the inner surface is reduced. Therefore, the pulling wires 51 and 52 are prevented from being broken.
[0031]
The angle α of the inclined surface 62 with respect to the major axis of the tube body 2 varies depending on the dimensions of the catheter tube 1, but in the case of an endoscope (fiber scope) for biliary tract, specifically, the angle α is 20 If it is about -60 degrees, the friction with the tow wires 51 and 52 and the inner side of the front-end | tip 61 of the closely wound coil 6 can be reduced effectively.
[0032]
Examples of the method of forming such an inclined surface 62 include a method of physically polishing the inside of the vicinity of the tip 61 of the closely wound coil 6 with a drill or the like, and a method of processing by electrolytic polishing, chemical polishing, or the like.
[0033]
Note that the shape of the inclined surface 62 does not have to be a tapered shape in which the inner diameter changes at a uniform rate toward the tip 61 of the densely wound coil 6 as shown in the figure, and the inner diameter is not uniform toward the tip 61. May have a shape in which the diameter is increased. In other words, the inclined surface 62 may have a fine unevenness, and it is sufficient that the inclined surface 62 has a shape expanding toward the tip 61 as a whole.
[0034]
The closely wound coil 6 may be a so-called round wire coil in which a wire having a substantially circular cross section is spirally wound, but as shown in the drawing, a flat wire having a horizontally long rectangular shape is spirally wound. It is preferably formed of a so-called flat coil that is rotated. Thereby, the thickness of the flat coil can be made as thin as possible, and the diameter of the tube body 2 can be reduced.
[0035]
The densely wound coil 6 is not limited to a single-layer winding, but may be a plurality of layers or a plurality of windings.
[0036]
Examples of the constituent material of the closely wound coil 6 include various metal materials such as stainless steel, carbon steel, tungsten steel, copper-based alloys such as copper or brass, aluminum, platinum, superelastic alloys, polytetrafluoroethylene, Various resins such as polyethylene, polypropylene, polyvinyl chloride, and polyester are listed.
[0037]
The distal end openings of the third lumen 43 and the fourth lumen 44 are sealed with fillers 53 and 54, and the ends of the pulling wires 51 and 52 are tubed at the bent portion 21 of the tube body 2 by the fillers 53 and 54. It is fixed to the main body 2. In addition, it is preferable that the fixing position of the pulling wires 51 and 52 is a position eccentric from the central axis of the tube main body 2, preferably the vicinity of the outer periphery of the tube main body 2.
[0038]
When such pulling wires 51 and 52 are pulled toward the base end side, a force for contracting the side of the tube main body 2 where the pulling wires 51 and 52 are disposed is applied in the base end direction of the tube main body 2, and FIG. As indicated by the one-dot chain line in the middle, the bent portion 21 bends to the side where the tips of the pulled wires 51 and 52 are located. Thereby, observation of the inner surface of a blood vessel or other tubular organ into which the catheter tube 1 is inserted and medical treatment can be performed.
[0039]
Note that the pulling wires 51 and 52 have strength and durability that do not cause breakage due to frequent pulling operations, and are preferably less stretched, such as stainless steel, superelastic alloy, and the like. Examples thereof include single wires and fiber bundles made of metal wires, high-tensile resin fibers such as polyamide, polyethylene, polyarylate, polyester, and polyimide, and carbon fibers.
[0040]
As shown in FIG. 1, the operating tool 8 connected to the proximal end side of the catheter tube 1 has an operating tool main body 81, and the tube main body 2 from the manifold portion 82 formed at the distal end of the operating tool main body 81. The base end portion 23 is inserted. A gripping portion 83 is formed on the proximal end side of the operation tool main body 81, and the optical fiber bundle 7 of the endoscope is inserted into the first lumen 71 at the proximal end portion of the gripping portion 83. A connector 84 is attached. In addition, a connector 85 that injects liquid, for example, into the second lumen 42 is attached to the grip portion 83. The connector 84 and the lumen 41, the connector 85, and the lumen 42 are connected to each other within the operation tool main body 82 by pipe lines (not shown).
[0041]
An operation dial 86 for pulling the wire 41 is rotatably supported between the manifold portion 82 and the grip portion 83 of the operation tool main body 81. A take-up reel (not shown) is fixed to the rotation shaft of the operation dial 86 and rotates integrally with the operation dial 86. The proximal ends of the wires 51 and 52 are exposed from the proximal ends of the lumens 43 and 44, pass through the operation tool main body 81, and are wound around the take-up reel. Thereby, for example, when the operation dial 86 is rotated in the clockwise direction in FIG. 1, the pulling wire 52 is pulled, the pulling wire 51 is relaxed, and the bent portion 21 is bent upward in FIG. When rotating in the direction, the pulling wire 51 is pulled, the pulling wire 52 is relaxed, and the bent portion 21 is bent downward in FIG.
[0042]
Thus, the bending part 21 can be bent, and the observation in the tubular organ can be performed over a wide range via the optical fiber bundle 7. In addition, liquid injection, suction, and other medical procedures can be performed through the lumen 42, and in particular, they can be performed over a wide range.
[0043]
As mentioned above, although the catheter tube of this invention was demonstrated based on the Example of illustration, this invention is not limited to this. For example, in the catheter tube of the present invention, the number and arrangement of the respective lumens are not limited to those shown in the drawing, and for example, at least one of the lumens 43 and 44 does not exist or other than the lumens 41 to 44, One or two or more lumens may be added.
[0044]
The catheter tube of the present invention can also be a balloon catheter in which a balloon (not shown) that expands and contracts by injecting and discharging working fluid is provided at the distal end of the tube body 2. In this case, a lumen for supplying the working fluid into the balloon can be added.
[0045]
The use of the catheter tube of the present invention is not limited to the endoscope catheter tube described above, but includes, for example, various catheter tubes such as an ablation catheter and a cardiac output measurement catheter, and a trocar tube used for laparoscopic surgery or the like. The present invention can be applied to various tube bodies.
[0046]
In addition to blood vessels, the catheter tube is inserted and placed in, for example, pancreatic duct, trachea, esophagus, stomach, intestine, ureter, bladder, biliary tract, abdominal cavity, and other organs such as the heart. It can also be used.
[0047]
Hereinafter, the catheter tube of the present invention will be described in more detail based on specific examples.
[0048]
(Example 1)
A catheter tube having the structure shown in FIGS. 1 to 7 was manufactured. The conditions of this catheter tube are as follows.
[0049]
<Tube body>
Constituent material: Soft polyvinyl chloride resin outer diameter: 2.8 mm
Full length: Approximately 50cm
Number of lumens: 4
Pulling wire and tightly wound coil storage lumen: 2 (inner diameter 0.6mm)
Lumen for storing optical fiber bundle: 1 (inner diameter 1.0mm)
Medical treatment, diagnostic instrument storage lumen: 1 (1.2mm inner diameter)
<Closely wound coil>
Constituent material: Stainless steel shape: Flat plate coil, single-layer winding length: 39.5cm
Outer diameter: 0.59mm
Inner diameter: 0.32 mm
Flat plate width: 0.373 mm
Flat plate thickness: 0.05mm
Inner diameter at coil tip: approx. 0.37mm
Thickness of the flat plate at the coil tip: about 0.025mm
Formation of inclined surface: angle α of polishing inclined surface by drill: about 45 °
Arrangement: Excluding the 4cm portion from the tip of the tube body
Constituent material: Number of polyarylate strands: 2 Outer diameter: about 0.3mm
<Optical fiber bundle>
Configuration: Image fiber (plastic fiber with a diameter of about 500 μm, about 6000 fibers)
Outer diameter: about 0.9mm
With respect to the catheter tube of the first embodiment, when the operation dial of the operation tool is rotated to bend the bent portion of the tube body, the bending operation is favorably performed in any direction. Also did not occur.
[0050]
(Comparative Example 1)
A catheter tube 1 having the same structure as in Example 1 was manufactured except that an inclined surface was not formed on the inner surface in the vicinity of the tip of the closely wound coil.
[0051]
[Evaluation]
Three catheter tubes of Example 1 and Comparative Example 1 were manufactured, and the breaking durability of the traction wire was measured for these catheter tubes. As a measuring method, the pulling wire was repeatedly pulled while the catheter tube was fixed, and the number of times of pulling until the pulling wire was cut was measured.
[0052]
The measurement results are shown in Table 1 below.
[0053]
[Table 1]

[0054]
As described above, it was confirmed that the catheter tube of Example 1 had 10 times more traction times than the catheter tube of Comparative Example 1 and was extremely excellent in rupture durability of the traction wire. .
[0055]
【The invention's effect】
As described above, the catheter of the present invention has a tube main body, at least one lumen formed over substantially the entire length of the tube main body, and the tube in the lumen, leaving the tip of the tube main body. At least one tightly wound coil disposed immovably in the longitudinal direction of the main body, at least one pulling wire disposed at the distal end of the tube body in the vicinity of the distal end of the tube body, and disposed in the tightly wound coil; A pulling tool capable of pulling the pulling wire in the proximal direction of the tube body, and pulling the pulling wire in the proximal direction of the tube body so that the distal end portion of the tube body is curved. The catheter tube is configured so that an inner surface near the tip of the densely wound coil is widened toward the tip of the closely wound coil. Since it is an inclined surface and the angle of the inclined surface with respect to the major axis of the tube body is 20 ° to 60 °, it is possible to reduce the friction between the closely wound coil and the pulling wire, and therefore The breaking durability of the pulling wire during the bending operation can be improved.
[Brief description of the drawings]
FIG. 1 is an overall side view showing an embodiment when the catheter tube of the present invention is applied to a catheter tube constituting an endoscope.
2 is a perspective view showing a configuration of a distal end portion of the catheter tube shown in FIG. 1. FIG.
FIG. 3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a cross-sectional view taken along line VV in FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.
7 is an enlarged longitudinal sectional view of a tip portion of the closely wound coil shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Catheter tube 2 Tube body 21 Bending part 22 Middle part 23 Base end part 24 Boundary part 3 Tip part 41 First lumen 42 Second lumen 43 Third lumen 44 Fourth lumen 51, 52 Pulling wires 53, 54 Filler 6 Closely wound coil 61 Tip 62 Inclined surface 7 Optical fiber bundle 71 Light transmitting fiber 72 Light receiving fiber 73 Lens 8 Operation tool 81 Operation tool body 82 Manifold part 83 Grip part 84 Connector 85 Connector 86 Operation dial

Claims (1)

A tube body;
At least one lumen formed over substantially the entire length of the tube body;
At least one closely wound coil disposed in the lumen so as not to move in the longitudinal direction of the tube body, leaving the distal end of the tube body;
At least one traction wire disposed at the front end portion of the tube body, and disposed in the tightly wound coil;
A pulling tool capable of pulling the pulling wire in the proximal direction of the tube body;
A catheter tube configured to bend the distal end portion of the tube body by pulling the puller wire toward the proximal direction of the tube body,
The inner surface in the vicinity of the tip of the densely wound coil is an inclined surface having a shape expanding toward the tip of the closely wound coil, and the angle of the inclined surface with respect to the major axis of the tube body is 20 ° to 60 °. The catheter tube characterized by being.

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