catheter

Abstract

To improve the torqueability of a catheter.SOLUTION: A catheter includes; a hollow shaft; a linear member, linearly provided on the outer periphery of the hollow shaft; and a metallic film, formed between the outer periphery of the hollow shaft and the linear member, and joined to each of the outer periphery of the hollow shaft and the linear member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a catheter. [Background technology]

[0002] Conventionally, a coil layer made of a metal wire is provided on the outside of an inner layer made of a resin. A catheter having an inner tube made of resin is disclosed (see, for example, Patent Document 1). and a braided body made of a plurality of metal wires on the outside of the inner tube. (See, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5075632 [Patent Document 2] JP 5-84303 Summary of the Invention [Problem to be solved by the invention]

[0004] However, even with the above-mentioned techniques, in a catheter in which a reinforcing body is formed on the outside of the inner layer, Therefore, there was room for improvement in torque transmission.

[0005] The present invention has been made to solve at least part of the above problems, and The purpose is to improve the torque transmission of the tail. [Means for solving the problem]

[0006] The present invention has been made to solve the above-mentioned problems and is realized as the following aspects. It is possible to do this.

[0007] (1) According to one aspect of the present invention, there is provided a catheter. The catheter has a hollow shaft. a linear member provided linearly on the outer periphery of the hollow shaft; A metal film formed between the material and the outer periphery of the hollow shaft and the linear member is bonded to each other. and a metal film.

[0008] According to this configuration, the hollow shaft, the metal film, and the linear member are joined together, The torque transmission properties of the catheter can be improved.

[0009] (2) In the catheter of the above embodiment, the linear member is wound spirally around the outer periphery of the hollow shaft. According to this configuration, since the wire member is in a coil shape, the catheter This improves the flexibility and torque transmission of the coil.

[0010] (3) In the catheter of the above form, the linear member has a height greater than a width in cross section. According to this configuration, the height of the linear member in the cross section of the linear member may be The pressure resistance of the catheter can be improved compared to when the width is smaller than the width.

[0011] (4) In the catheter of the above form, the linear member is joined to the metal film in cross section. The width of the linear member may be reduced from the inside toward the outside. According to the invention, the volume of the linear member near the surface of the hollow shaft is reduced while maintaining the height of the linear member. This allows the hollow shaft to be used without compromising its pressure resistance. By increasing the flexibility of the catheter near its surface, it can be inserted into the patient's body. This reduces the possibility of the catheter damaging blood vessels or internal organs.

[0012] (5) In the catheter of the above form, the metal film is made of stainless steel, and the linear member is In this case, the stainless steel may be used. The metal film is used as a conductive film, and the outer surface of the metal film is coated with a nickel-cobalt alloy by electroplating. By using a nickel-cobalt alloy for the wire member, This can improve the torque transmission of the catheter.

[0013] (6) In the catheter of the above form, the hollow shaft is made of PTFE (polytetrafluoroethylene). a first hollow shaft formed of polyethylene; a second hollow shaft formed of PAE (polyamide thermoplastic elastomer); According to this configuration, for example, the first hollow shaft may be inserted into the lumen of the catheter. The first hollow shaft is made of PTFE, and the inner circumferential surface of the catheter is This can reduce the frictional resistance between the catheter and the device inserted inside. By providing the PAE in the second hollow shaft, the catheter becomes flexible and the catheter can be easily bent. This can improve the restoration performance when

[0014] (7) In the catheter of the above form, the linear member is formed in a lattice pattern on the outer periphery of the hollow shaft. According to this configuration, a metal reinforcing body is provided without using a metal wire. This allows the catheter to be manufactured in a manner that allows the metal wires to be easily inserted into the catheter. The flexibility of the catheter is maintained because the metal wires do not interfere with each other and hinder the flexibility of the catheter. The flexibility can be improved.

[0015] The present invention can be realized in various modes, for example, a guide wire, a guide The present invention can be realized in the form of a method for manufacturing an endoscope, an endoscope, a dilator, etc. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is an explanatory diagram illustrating the overall configuration of a catheter according to a first embodiment. [Figure 2] FIG. 1 is an explanatory view illustrating the overall configuration of a catheter according to a first embodiment, with a portion of the catheter being see-through. [Figure 3] FIG. 3 is an explanatory diagram showing an enlarged view of an area X1 in FIG. 2. [Figure 4] FIG. 3 is an explanatory diagram showing an enlarged view of an area Y1 in FIG. 2. [Figure 5] FIG. 1 is an explanatory view illustrating a cross-sectional configuration of a catheter according to a first embodiment. [Figure 6] FIG. 6 is an explanatory diagram showing an enlarged view of region Z in FIG. 5. [Figure 7] FIG. 2 is an explanatory diagram illustrating a first manufacturing method for the catheter of the first embodiment. [Figure 8] FIG. 10 is an explanatory diagram illustrating the overall configuration of a second embodiment with a portion thereof being transparent. [Figure 9] FIG. 9 is an explanatory diagram showing an enlarged view of region X2 in FIG. 8. [Figure 10] FIG. 9 is an explanatory diagram showing an enlarged view of an area Y2 in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0017] First Embodiment A catheter according to an embodiment of the present disclosure will be described with reference to the drawings. The present invention is not limited to the embodiments described above.

[0018] FIG. 1 is an explanatory diagram illustrating the overall configuration of a catheter 1 according to a first embodiment. FIG. 2 is an explanatory diagram illustrating the overall configuration of the catheter 1 with a partial perspective view. 1 is a partially see-through view illustrating the state of the linear member 30 in the entire catheter 1. 2, region X1 indicates a part of the tip of the hollow shaft 10, and region Y1 indicates the A portion of the rear end of the shaft 10 is shown.

[0019] In FIG. 1, the left side is the distal end side of the catheter 1 and each component of the catheter 1, and the right side is the distal end side of the catheter 1. The side of the catheter 1 is the rear end side of the catheter 1 and each component of the catheter 1. is the side that is inserted into the body (distal side), and the base end side of the catheter 1 is The left and right directions of FIG. 1 are the catheter 1 and each component. The direction perpendicular to the axial direction is called the radial direction of the catheter 1 and each component. Call.

[0020] In addition, the end portion of the catheter 1 and each component of the catheter 1 located on the distal end side is referred to as the "tip end." " and the part extending from the tip to the middle towards the rear end is called the "tip part." Similarly, the catheter 1 and the respective components of the catheter 1 are located at the rear end side. The end is described as the "rear end" and the part extending from the rear end to the middle of the tip side is included. is referred to as the "rear end portion."

[0021] For the sake of convenience, the relative proportions of the sizes of the components in FIG. 1 are not shown in actual proportions. These points are included in the respective explanatory drawings shown in Figs. The same applies to

[0022] The catheter 1 is a medical device that is inserted into blood vessels or digestive organs and used for treatment and examination. The catheter 1 includes a hollow shaft 10, a distal tip 40, and a grip portion 60. do. The hollow shaft 10 is a long tubular body extending in the axial direction of the catheter 1. 40 is a tubular body joined to the tip of the hollow shaft 10. The gripping part 60 is The catheter 1 is attached to the rear end of the handle 10 and is held by an operator such as a doctor for operation of the catheter 1. It is a tubular body.

[0023] The distal tip 40 is joined to the distal end of the hollow shaft 10 and extends through the lumen 5 of the catheter 1. The distal tip 40 is a tubular body that forms a part of the distal end of the needle. For example, TPU (thermoplastic polyurethane elastomer) can be selected. The distal tip 40 is not limited to being made of a resin material, but may also be made of a metal material. .

[0024] The gripping portion 60 is joined to the rear end of the hollow shaft 10 and is located in the lumen 50 of the catheter 1. The grip portion 60 is a tubular body that forms a part of the rear end portion. The grip portion 60 is made up of a protector 61, a main body 62, and The protector 61 has a connector 63. The protector 61 has an outer casing 64 extending toward the rear end side of the protector 61. The main body 62 has a tapered shape with an increasing diameter. The connector part 63 has a protrusion on the outer periphery for ease of connection. and can be connected to other medical devices such as a syringe (not shown). The gripping portion 60 can be made of a material that is durable and suitable for sterilization. For example, it may be metal, injection molded plastic, or a combination thereof.

[0025] 3 is an explanatory diagram showing an enlarged view of the area X1 in FIG. 2. 1 is a partially enlarged and partially transparent view illustrating the metal film 20 and the linear member 30. 4 is an explanatory diagram showing an enlarged view of the region Y1 in FIG. 2. FIG. 4 shows the rear end portion of the hollow shaft 10. 1 is a partially enlarged and partially transparent view illustrating the metal film 20 and the linear member 30. .

[0026] The hollow shaft 10 includes an inner layer 11, an intermediate layer 12, an outer layer 13, a metal film 20, and a wire portion. It has material 30.

[0027] The inner layer 11 is a long tubular body provided inside the hollow shaft 10. The inner layer 11 is The intermediate layer 12 defines a lumen 50 of the catheter 1. The intermediate layer 12 is a long, flexible membrane that covers the outer periphery of the inner layer 11. The outer layer 13 is provided on the outside of the hollow shaft 10 and surrounds the outer periphery of the intermediate layer 12. The inner layer 11, the intermediate layer 12, and the outer layer 13 are long tubular bodies that are to be covered. The rear end portions of the inner layer 11, the intermediate layer 12, and the outer layer 13 are joined to the end tip 40. It is joined to the grip portion 60 .

[0028] The inner layer 11 is formed so that a medical device such as a guide wire (not shown) can be inserted inside the inner layer 11. The surface of the base can be made of a resin material with excellent slipperiness. For example, PTFE (polytetrafluoroethylene) fluoroethylene), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether) copolymer) or FEP (tetrafluoroethylene-hexafluoropropylene copolymer) ) or polyethylene. It may be formed of other known materials.

[0029] The intermediate layer 12 and the outer layer 13 are not particularly limited, but may be made of an elastomer-based resin material. It can be made of a material such as PAE (polyamide thermoplastic elastomer), TPU (thermoplastic polyurethane elastomer) or TPEE (polyester elastomer) The intermediate layer 12 and the outer layer 13 may be formed of known materials other than those mentioned above. It may be formed as follows.

[0030] FIG. 5 is an explanatory view illustrating a cross-sectional configuration of the catheter of the first embodiment. 5 is a cross-sectional view of the hollow shaft 10 in a longitudinal section. Fig. 6 is an explanatory diagram showing an enlarged view of region Z in Fig. 5. Fig. 6 shows the catheter 1 is an enlarged view of a portion of the hollow shaft in a longitudinal cross section, showing the state of the metal film 20 and the linear member 30. FIG.

[0031] The metal film 20 will be described with reference to Figs. 2 to 6. The metal film 20 is formed on the surface of the intermediate layer 12. The catheter 1 is a metal membrane-like member formed in a spiral shape along the axial direction of the catheter 1. The metal membrane 20 is bonded to the intermediate layer 12 and is oriented in the axial direction of the catheter 1 relative to the intermediate layer 12. The size of the metal film 20 in the axial direction of the catheter 1 is determined by the metal film 20 As shown in FIG. 3, the width Wm of the metal film 20 located in the region X1 is Wm 4, the width of the metal film 20 located in the region Y1 is Wm2. As shown in FIG. 1, the width Wm of the metal film 20 decreases toward the tip of the catheter 1. In other words, the width Wm2 of the metal film 20 located at the rear end of the catheter 1 is The width Wm1 of the metal film 20 located at the tip side is smaller than the width Wm1 of the metal film 20 located at the tip side. The height Hm of the metal film 20 can be set to, for example, 1 Å to 100 Å. The film 20 can be made of, for example, stainless steel, or silver, copper, etc. Since silver and copper have high conductivity, it is relatively easy to consider various pattern conditions. Silver in particular has high conductivity and a proven track record in terms of biocompatibility, making it suitable for blood It is effective as a coating for areas that require contact.

[0032] The linear member 30 will be described with reference to Figs. 2 to 6. As shown in Fig. 2, the linear member 3 0 is a metal spiral formed on the surface of the metal film 20 along the axial direction of the catheter 1. The linear member 30 is bonded to the metal film 20. Therefore, the linear member 30 does not move relative to the axial direction of the catheter 1. When the catheter 1 is observed from a plane parallel to the line direction (longitudinal cross section), the axis of the catheter 1 is In the repeated linear members 30, each adjacent The interval between the linear members 30 is defined as the pitch P of the linear members 30, and the catheter length of each linear member 30 is defined as The angle of the terminating member 1 with respect to the imaginary axis 51 is defined as the inclination angle α. The angle of inclination α of the linear member 30 becomes smaller toward the distal end of the catheter 1. It gets smaller towards the tip of Teru 1.

[0033] As shown in FIG. 3, the pitch P of the linear members 30 located in the region X1 is set to P1, and as shown in FIG. As shown in the figure, the pitch P of the linear members 30 located in the region Y1 is set to P2. The pitch P2 of the linear members 30 located at the end is smaller than the pitch P3 of the linear members 30 located at the tip side. The linear member 30 is bonded to the metal film 20, and the metal film 20 is Since the intermediate layer 12 is bonded to the intermediate layer 12, the pitch The inclination angle α of the linear member 30 located in the region X1 is set to α1, and the region The inclination angle α of the linear member 30 at the position Y1 is set to α2. The inclination angle α1 of the linear member 30 located at the tip side is smaller than the inclination angle α2 of the linear member 30. Sai.

[0034] As shown in FIGS. 5 and 6, the linear member 30 has a trapezoidal shape in the longitudinal cross section of the catheter 1. The wire member 30 has a width Wi of the part in contact with the metal film 20 and a width W of the part in contact with the outer circumferential surface of the catheter 1. The width W of the near portion is Wo. The width Wi is larger than the width Wo. o becomes smaller toward the tip of the catheter 1. As shown in FIG. The width Wi of the linear member 30 at position 1 is Wi1, and the width Wo is Wo1. The width Wi of the linear member 30 located in the region Y1 is defined as Wi2, and the width Wo of the linear member 30 is defined as Wo2. The shaped member 30 has a height H. The height H is greater than the width Wi. The ratio of the width Wi to the height H of the linear member 30 can be set to 3:1. For example, the height H can be set to 10 μm to 100 μm. The linear member 30 is made of, for example, a nickel-cobalt alloy. It is possible.

[0035] <Example of effect> According to this configuration, the hollow shaft 10, the metal film 20, and the linear member 30 are joined together. As a result, the torque transmission, pressure resistance, stretch resistance, etc. of the catheter 1 can be improved. When a doctor or other operator rotates the gripping portion 60, a torque is generated in the catheter 1. This reduces the rate attenuation from the rear end to the tip of the catheter 1. In addition, the linear member 30 is simply wound around the hollow shaft 10 in a spiral shape, and the plurality of linear members 3 When the linear member 30 is not joined to the hollow shaft 10, the end of the linear member 30 is elastically supported by its own elasticity. According to this configuration, the metal film 20 and the linear member 30 are in the center. Since the wire member 30 is joined to the hollow shaft 10, the possibility that the end of the wire member 30 will expand in the radial direction is reduced. can be reduced.

[0036] In addition, the hollow shaft of the catheter is connected to the inside and outside of the hollow shaft, and a contrast agent or the like is introduced into the hollow shaft. In some cases, side holes are provided for spraying the chemical solution. The coil body is formed by winding a metal wire around a hollow shaft in a spiral shape, and the coil body is formed by winding a metal wire around a hollow shaft in a spiral shape. When a braid formed by braiding metal wires is used, the metal wires of the coil body or braid body can be straightened. A restoring force that tries to return the shaft to its original shape is applied to the hollow shaft. This structure does not have a metal wire, and the hollow shaft is broken in the intermediate layer 12. Since the linear member 30 is joined via the metal film 20, the hollow shaft Therefore, even if a side hole is provided in the catheter 1, pressure is not applied to the catheter 10. Even if the side hole is broken, the possibility of the hollow shaft 10 being broken at the base point can be reduced. .

[0037] The width Wm of the metal film 20, the width Wi and the width Wo of the linear member 30 are The catheter 1 is tapered toward the distal end. The catheter 1 is inserted into the patient's body, and the catheter 1 When the device comes into contact with the patient's blood vessels or internal organs, the possibility of damaging the patient's blood vessels or internal organs is reduced. In addition, when the catheter 1 is inserted into a curved blood vessel, the catheter 1 may be inserted into the blood vessel. The catheter 1 can advance inside the blood vessel by deforming according to the curved shape of the catheter.

[0038] In the cross section of the linear member 30, the height H is greater than the width Wi. Compared with the case where the width is smaller than Wi, the resistance to pressure applied in the radial direction of the hollow shaft 10 is In addition, since the width Wi is smaller than the height H, the catheter 1 can be easily moved in the axial direction. The gap between the linear members 30 in the direction of the arrows becomes relatively large. As a result, the volumes of the resin layers such as the inner layer 11, the intermediate layer 12, and the outer layer 13 become relatively large. Therefore, when the catheter 1 is bent, the axis of the catheter 1 is applied to the outer circumferential surface of the catheter 1. The resin layer can alleviate the compressive or tensile force in the direction. The height H of the catheter 1 is large, so that the resistance to the force applied in the radial direction of the catheter 1 is large. Therefore, deformation is suppressed. As a result, the roundness of the catheter 1 is maintained during operation. In addition, in the cross section of the linear member 30, the width Wi is larger than the width Wo. By making the diameter large, the volume of the linear member on the surface of the hollow shaft 10 can be reduced. This allows the pressure resistance of the hollow shaft 10 to be maintained while the pressure near the surface of the hollow shaft 10 is maintained. This allows the catheter 1 to be easily inserted into the patient's blood vessels, internal organs, etc. This reduces the possibility that the catheter 1 will damage the patient's blood vessels or internal organs when it comes into contact with the patient.

[0039] By using stainless steel for the metal film 20 and a nickel-cobalt alloy for the linear member 30, The metal film 20 is used as a conductive film, and the linear members 30 are formed on the outer circumferential surface of the metal film 20 by electrolytic plating. By using a nickel-cobalt alloy for the wire member 30, torque transmission can be improved. In addition, by using PTFE for the inner layer 11, it is possible to manufacture a catheter 1 having excellent properties. The friction resistance between the inner surface of the catheter 1 and the device inserted inside the catheter 1 is By using PAE for the intermediate layer 12 or the outer layer 13, the catheter 1 This can improve the flexibility of the material and its ability to recover when bent.

[0040] The inclination angle α of the linear member 30 is made smaller toward the distal end of the catheter 1, and the pitch P is , by making the diameter smaller toward the tip of the catheter 1, This allows the linear members 30 to be formed densely. Improved torque transmission.

[0041] <Manufacturing method> FIG. 7 is an explanatory diagram illustrating a first method for manufacturing the catheter 1 of the first embodiment.

[0042] First, as shown in FIG. 7A, the inner layer 11 and the intermediate layer 12 are extruded onto the core material 120. The hollow shaft 200 is then fabricated by molding or the like. The metal film 20 is coated by electroless plating or sputtering, and a gold layer is formed on the outer periphery of the metal film 20. The metal layer 100 is coated by electrolytic plating or the like. The etching resist 110 is applied to the outer periphery of the metal layer 100. Next, for example, the base material 300 is rotated around the axial direction of the base material 300. While moving the base material 300 in the axial direction, the laser 130 is irradiated onto the outer periphery of the base material 300. As a result, the etching resist 110 is removed in a spiral shape. Then, the etching resist 110 is removed, and the metal layer is exposed in a spiral shape to the outside. The metal film 20 inside the metal film 100 is dissolved by an etching solution 140. The metal layer 100 starts to melt from the portion located radially outward of the metal layer 100. Therefore, the amount of melting is greater at the radially outer portion of the metal layer 100, and is smaller at the radially inner portion. As a result, the molten metal layer 100 melts along the longitudinal direction of the catheter 1. The surface has a trapezoidal shape with the width increasing from the radially outer side to the radially inner side. As shown in FIG. 7C, the spiral portion was not removed by the laser 130 in the previous process. The etching resist 110 remaining on the outer periphery of the metal layer 100 is removed. Through the above steps, the inner layer 11 and the intermediate layer 12 are coated on the outer periphery of the core material 120, and the intermediate layer 1 The base material 300 is fabricated by forming a metal film 20 and a metal layer 100 spirally on the outer periphery of the base material 2. The base material 300 may be coated with an outer layer 13 (see FIGS. 1 to 6).

[0043] <Example of effect> According to this configuration, the catheter 1 having a reinforcing body made of metal can be manufactured without using a metal wire. The metal film 20 can be formed by electroless plating, sputtering, or the like. The metal layer 100 is formed on the outer surface of the shaft by electroplating or the like. As a result, the metal layer 100 is connected to the first hollow shell via the metal film 20. Therefore, for example, the resin tube for forming the outer layer 13 is bonded to the cushion 201. When the metal layer 100 is coated with the hollow shaft 200, the metal layer 100 is This prevents the position of the catheter 1 from moving, thereby improving the manufacturing efficiency of the catheter 1.

[0044] Second Embodiment FIG. 8 is an explanatory diagram illustrating the overall configuration of a catheter 2 according to a second embodiment, with a portion of the catheter 2 seen through. FIG. 8 is a perspective view of the linear member 31 in the entire catheter 2. The catheter 2 of the second embodiment is the same as the catheter 1 of the first embodiment. Instead of the hollow shaft 10, a hollow shaft 70 is provided. The metal film 20 in the catheter 1 is replaced with a metal film 21, and the linear member 30 is replaced with a linear member 3. The catheter 2 has a hollow shaft 70 and a hollow tube 71. Therefore, the description of the components other than the hollow shaft 70 will be omitted. The region X2 indicates a part of the tip of the hollow shaft 70, and the region Y2 indicates a part of the rear of the hollow shaft 70. A portion of the end portion is shown.

[0045] 9 is an explanatory diagram showing an enlarged view of the region X2 in FIG. 8. 1 is a partially enlarged and partially transparent view illustrating the state of the metal film 21 and the linear member 31. 10 is an explanatory diagram in which the area Y2 in FIG. 8 is enlarged. 1 is a partially enlarged view of the end portion, illustrating the state of the metal film 21 and the linear member 31 in a partially transparent manner. be.

[0046] As shown in FIG. 8, the metal film 21 is formed on the outer periphery of the intermediate layer 12 along the axial direction of the catheter 2. The metal film 21 is a metal film-like member formed in a grid pattern by bonding the metal film 21 to the intermediate layer 12. The intermediate layer 12 is fixed to the catheter 2 so that it does not move relative to the intermediate layer 12 in the axial direction of the catheter 2. As shown in FIG. 10, the width Wm of the metal film 21 located in the region X2 is set to Wm3. As shown, the width of the metal film 21 located in the region Y2 is Wm4. The relationship between Wm1 and Wm2 is the same as the relationship between Wm1 and Wm2 in the first embodiment.

[0047] As shown in FIG. 8, the wire member 31 is attached to the outer periphery of the metal film 21 in the axial direction of the catheter 2. The wire members 31 are made of metal and are formed in a grid shape along the metal film 21. The catheter 2 is fixed to the metal film 21 and does not move relative to the metal film 21 in the axial direction of the catheter 2. When the catheter 2 is observed from a plane parallel to the axial direction of the catheter 2 (longitudinal cross section), The X-shaped linear member 31 that crosses the axis of the catheter 2 appears repeatedly. In the linear member 31, the part inclined toward the tip side with respect to the axis of the catheter 2 is made linear. The element 31a of the shaped member 31 is an element 31a, and the part inclined toward the rear end is an element 31b. 31b is not a separate member, but the linear member 31 is integrally produced over its entire length. Therefore, when the catheter 2 is operated by a doctor or other operator, the element 31a and the element 31b do not move independently of each other, and even during the operation of the catheter 2, the elements 31 The X shape formed by a and element 31b is maintained.

[0048] As shown in FIG. 9, the element 31a of the linear member 31 located in the region X2 of the catheter 2 The inclination angle αa with respect to the virtual axis 51 is α3a, and the element 3 of the linear member 31 located in the region X2 is The inclination angle αb of the catheter 2 of 1b with respect to the virtual axis 51 is defined as α3b. In this way, the imaginary axis 51 of the catheter 2 of the element 31a of the linear member 31 located in the region Y2 The inclination angle αa with respect to the catheter is α4a, and the catheter of the element 31b of the linear member 31 located in the region Y2 is The angle of inclination αb of the linear member 2 with respect to the imaginary axis 51 is defined as α4b. In FIG. 9, the inclination angle αa and the inclination angle αb are approximately the same. In FIG. 10, the inclination angle α4a and the inclination angle α3b are approximately equal in magnitude. The angle α4b has approximately the same size.

[0049] As shown in FIG. 9, the pitch P a is P3a, and the pitch Pb between adjacent elements 31b of the linear member 31 located in the region X2 is P3 As shown in FIG. 10, adjacent elements 31a of the linear member 31 located in the region Y2 The pitch P of the linear member 31 located in the region Y2 is P4a, and the pitch P of the linear member 31 located in the region Y2 is P In each linear member 31, the pitch Pa and the pitch Pb are In FIG. 9, the pitches P3a and P3b are approximately the same. In Fig. 10, the pitch P4a and the pitch P4b have approximately the same size.

[0050] As shown in FIG. 9, the width Wi of the linear member 31 located in the region X2 is Wi3, and the width Wo is As shown in FIG. 10, the width Wi of the linear member 31 located in the region Y2 is Wi 4. The width Wo is set to Wo4. At this time, the relationship between Wi3 and Wi4 is the same as that of the first embodiment. The relationship between i1 and Wi2 is the same as that between Wo3 and Wo4. This is similar to the relationship between the forms Wo1 and Wo2.

[0051] <Example of effect> When the catheter has a braided body formed by braiding a plurality of metal wires, the catheter When the terminal is bent, the metal wires interfere with each other at their intersections. The braided body is deformed into an elliptical shape, which improves torque transmission, push-pull operability, and flexibility. However, the linear member 31 is an integrally manufactured lattice-shaped part. It is a material that does not have multiple metal wires. Therefore, the metal wires do not interfere with each other, and the catheter Even when the terminal 2 is bent, the linear member 31 can maintain a shape close to a perfect circle. This improves torque transmission, push-pull properties, and flexibility. In addition, the outer diameter of the catheter can be made smaller than when multiple metal wires are used. This makes it easy to insert the catheter 2 into peripheral blood vessels with small inner diameters. In addition, the plurality of linear members 31 are simply wound around the hollow shaft 70 in a braided manner. When the linear member 31 and the hollow shaft 70 are not joined, the end of the linear member 31 is According to this configuration, the metal film 21 and the linear member Since the linear member 31 is joined to the hollow shaft 70, the end of the linear member 31 may expand in the radial direction. This can reduce the possibility of

[0052] The inclination angle αa of the element 31a of the linear member 31 is set to be approximately the same as the inclination angle αb of the element 31b. In addition, by making the pitch Pa of the elements 31a and the pitch Pb of the elements 31b approximately the same, the catheter Torque transmission can be improved regardless of the rotation direction of the coil 2.

[0053] <Modification of this embodiment> The present invention is not limited to the above-described embodiment, and any modifications may be made without departing from the spirit and scope of the present invention. It can be implemented in various modes, and for example, the following modifications are also possible.

[0054] [Variation 1] In the catheter 1 of the first embodiment, the metal film 20 is bonded to the surface of the intermediate layer 12. However, the catheter 1 does not have the intermediate layer 12, and only has the inner layer 11 and the outer layer 13. The metal film 20 may be bonded to the surface of the inner layer 11. m becomes smaller toward the tip of the catheter 1. However, the metal film 20 The width Wm of the catheter 1 may increase toward the distal end of the catheter 1. The rigidity of the tip of the tel 1 can be increased.

[0055] [Variation 2] In the catheter 1 of the first embodiment, the pitch P of the linear member 30 is However, the pitch P of the linear members 30 is smaller toward the end of the catheter. The diameter of the catheter 1 may be increased toward the distal end. The flexibility of the wire member 30 can be further improved. However, the inclination angle α of the linear member 30 is , may become larger toward the distal end of the catheter 1.

[0056] [Variation 3] In the catheter 1 of the first embodiment, the linear member 30 is However, the linear member 30 has a trapezoidal shape in the longitudinal cross section of the catheter 1. Instead of a square or rectangular shape, it may be a semicircular shape that is convex radially outward. It is possible to form it into various shapes. In addition, the width Wi is larger than the width Wo. However, the width Wi may be smaller than the width Wo.

[0057] [Variation 4] In the catheter 1 of the first embodiment, the widths Wi and Wo of the linear member 30 are However, the width W of the linear member 30 is The length i and width Wo may increase toward the distal end of the catheter 1. This increases the rigidity of the distal end of the catheter 1. However, the height H of the linear member 30 is set to be greater than the width Wi. In this case, the catheter length is shorter than when the height H is greater than the width Wi. The outer diameter of the catheter 1 can be reduced. The height H of the linear member 30 is approximately constant in the axial direction. For example, the distance from the catheter 1 to the distal end of the catheter 1 may not be substantially constant. The height H may be reduced. In this case, the flexibility of the distal end of the catheter 1 is further improved. It is possible.

[0058] The modified example of the catheter 1 of the first embodiment described above may be applied to the second embodiment within the applicable range. It can also be applied to other situations.

[0059] [Variation 5] In the catheter 2 of the second embodiment, the inclination angle αa and the inclination angle αb of each linear member 31 are The angle αb is set to be approximately the same. However, the angle αa and the angle αb are set to be approximately the same. In this case, the linear member 31 is formed on a surface parallel to the axial direction of the catheter 2. When the catheter 2 is observed from a longitudinal cross section, it has an X-shape that is not symmetrical.

[0060] [Variation 6] In the catheter 2 of the second embodiment, the pitch Pa and pitch The size of the pitch Pa and the pitch Pb are assumed to be approximately the same. In this case, the linear member 31 is formed on a surface parallel to the axial direction of the catheter 2. When the catheter 2 is observed from a longitudinal cross section, it has an X-shape that is not symmetrical.

[0061] The present embodiment has been described above based on the embodiments and modifications. The form of is intended to facilitate understanding of this embodiment and is not intended to limit this embodiment. This embodiment may be modified or improved without departing from the spirit and scope of the claims. In addition, the present embodiment includes equivalents thereof. If it is not explained as such, it may be deleted as appropriate. [Explanation of symbols]

[0062] 1...Catheter of the first embodiment 2...Catheter of the second embodiment 10...Hollow shaft of the first embodiment 11...Inner layer 12...Middle class 13…outer layer 20...metal film of the first embodiment 21...metal film of the second embodiment 30...Linear member of the first embodiment 31...Linear member of the second embodiment 31a: A portion inclined toward the tip of the linear member in the second embodiment 31b: A portion of the linear member inclined toward the rear end of the second embodiment 40...Tip 50...lumens 51... Virtual axis of catheter 60...Gripping part 61...Protector 62...Main body 63...Connector 70...Hollow shaft of the second embodiment 100...metal layer 120...Core material 130...Laser 140...etchant 200...Hollow shaft 300…Base material Wm: Width of metal film Hm: Height of metal film Wi: Width of the part of the linear member that is in contact with the metal film 20 Wo: Outer width of linear member H: Height of linear member P: Pitch of linear members Pa: Pitch of the portion inclined toward the tip of the linear member in the second embodiment Pb: Pitch of the portion of the linear member inclined toward the rear end of the second embodiment α: Inclination angle of linear member αa: Inclination angle of the portion inclined toward the tip end of the linear member in the second embodiment αb: Inclination angle of the portion inclined toward the rear end of the linear member in the second embodiment

Claims

1. A tubular member included in any one of a catheter, a guidewire, an endoscope, and a dilator, A hollow shaft; a linear member provided linearly on the outer periphery of the hollow shaft; a metal film formed between an outer periphery of the hollow shaft and the linear member, the metal film being joined to the outer periphery of the hollow shaft and the linear member, The linear member is a first linear member that is spirally wound around the outer periphery of the hollow shaft along the axial direction of the cylindrical member and that is inclined to one side with respect to the axis of the cylindrical member; a second linear member different from the first linear member, the second linear member being wound spirally around the outer periphery of the hollow shaft along the axial direction of the cylindrical member and inclined to the other side with respect to the axis of the cylindrical member, the first linear member and the second linear member intersect with each other at a plurality of locations and are integrally formed at the intersecting portions; The pitch of the linear members decreases toward the tip of the tubular member. Cylindrical member.

2. The cylindrical member according to claim 1, The linear member has a height greater than a width in cross section. Cylindrical member.

3. The cylindrical member according to claim 1 or 2, In a cross section, the width of the linear member decreases from the inside where the linear member is joined to the metal film toward the outside. Cylindrical member.

4. The cylindrical member according to any one of claims 1 to 3, the metal film is made of stainless steel, and the linear member is made of a nickel-cobalt alloy; Cylindrical member.

5. The cylindrical member according to any one of claims 1 to 4, The hollow shaft includes a first hollow shaft made of PTFE (polytetrafluoroethylene), and a second hollow shaft arranged on the outer periphery of the first hollow shaft and made of PAE (polyamide-based thermoplastic elastomer). Cylindrical member.

6. The cylindrical member according to claim 1, The linear members are formed in a lattice pattern on the outer periphery of the hollow shaft. Cylindrical member.

7. A medical device which is any one of a catheter, a guidewire, an endoscope, and a dilator, having a tubular member described in any one of claims 1 to 6.

8. A tubular member included in a medical instrument that is inserted into a blood vessel or a digestive organ and used for treatment or examination, A hollow shaft; a linear member provided linearly on the outer periphery of the hollow shaft; a metal film formed between an outer periphery of the hollow shaft and the linear member, the metal film being joined to the outer periphery of the hollow shaft and the linear member, The linear member is a first linear member that is spirally wound around the outer periphery of the hollow shaft along the axial direction of the cylindrical member and that is inclined to one side with respect to the axis of the cylindrical member; a second linear member different from the first linear member, the second linear member being wound spirally around the outer periphery of the hollow shaft along the axial direction of the cylindrical member and inclined to the other side with respect to the axis of the cylindrical member, the first linear member and the second linear member intersect with each other at a plurality of locations and are integrally formed at the intersecting portions; The pitch of the linear members decreases toward the tip of the tubular member. Cylindrical member.

9. A tubular member according to claim 8, The linear member has a height greater than a width in cross section. Cylindrical member.

10. A tubular member according to claim 8 or claim 9, In a cross section, the width of the linear member decreases from the inside where the linear member is joined to the metal film toward the outside. Cylindrical member.

11. A tubular member according to any one of claims 8 to 10, the metal film is made of stainless steel, and the linear member is made of a nickel-cobalt alloy; Cylindrical member.

12. A tubular member according to any one of claims 8 to 11, The hollow shaft includes a first hollow shaft made of PTFE (polytetrafluoroethylene), and a second hollow shaft arranged on the outer periphery of the first hollow shaft and made of PAE (polyamide-based thermoplastic elastomer). Cylindrical member.

13. A tubular member according to claim 8, The linear members are formed in a lattice pattern on the outer periphery of the hollow shaft. Cylindrical member.

14. A medical device having a tubular member described in any one of claims 8 to 13, which is inserted into a blood vessel or digestive organ and used for treatment or examination.

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