catheter

Abstract

To provide a catheter in which conductor wires are hardly short-circuited.SOLUTION: A catheter includes: a shaft 2 having a first side hole and a second side hole; a first electrode disposed outside the first side hole; a second electrode disposed outside the second side hole; a first conductor wire 41 connected to the first electrode; a second conductor wire 42 connected to the second electrode; and an inner member 50 disposed in a lumen 20. At least one of the shaft 2 and the inner member 50 includes at least one partition part 53 for partitioning the lumen 20 at least into a first lumen region 21 and a second lumen region 22. The first lumen region 21 and the second lumen region 22 extend along a longitudinal axis direction respectively. Parts 181 and 182 of the gap with the inner member 50 of the shaft 2 are smaller than a diameter of the first conductor wire 41 and smaller than a diameter of the second conductor wire 42. The first conductor wire 41 is disposed in the first lumen region 21 and the second conductor wire 42 is disposed in the second lumen region 22.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an electrode catheter for use in defibrillation, cauterization of body tissue, measuring electrical potentials of body organs, and the like. [Background technology]

[0002] Electrode catheters with electrodes on their shafts are primarily used as medical devices for applying electrical stimulation or cauterizing body tissues to treat arrhythmias such as atrial fibrillation and ventricular fibrillation, or for measuring the electrical potential of organs such as the heart. In electrode catheters, multiple electrodes are disposed on the outside of a shaft having a lumen. Conductors electrically connected to the inner surfaces of the electrodes extend through the lumen of the shaft to an external device, such as a defibrillation power supply or an electrocardiograph. Patent documents 1 and 2 disclose examples of devices with electrodes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-97084 A [Patent Document 2] Special Publication No. 2006-506195 Summary of the Invention [Problem to be solved by the invention]

[0004] A catheter having a plurality of conductors disposed within the shaft lumen is provided with a narrow lumen, which may cause a short circuit between the conductors. Therefore, an object of the present invention is to provide a catheter in which the conductors are less likely to short circuit between each other. [Means for solving the problem]

[0005] One embodiment of the catheter of the present invention that can achieve the above-mentioned object comprises a shaft extending in a longitudinal direction from a distal end to a proximal end, the shaft having an inner lumen, a first side hole communicating with the inner lumen, and a second side hole proximal to the first side hole, a first electrode disposed on the outside of the first side hole, a second electrode disposed on the outside of the second side hole, a first conducting wire electrically connected to the first electrode and extending through the first side hole into the inner lumen of the shaft, a second conducting wire electrically connected to the second electrode and extending through the second side hole into the inner lumen of the shaft, and and an inner member disposed in the first lumen region, and at least one of the shaft and the inner member has at least one partition portion that divides the lumen of the shaft into at least a first lumen region and a second lumen region, the first lumen region and the second lumen region each extending along the longitudinal axis, the shaft has a gap between the inner member, a part of the gap is smaller than the diameter of the first conductor and smaller than the diameter of the second conductor, the first conductor is disposed in the first lumen region, and the second conductor is disposed in the second lumen region. In the catheter according to the present invention, the lumen of the shaft is divided by the partition portion, and the size of the part of the gap between the shaft and the inner member is set as described above, so that the first conductor disposed in the first lumen region is less likely to move to the second lumen region, and the second conductor disposed in the second lumen region is also less likely to move to the first lumen region. As a result, the first conductor is less likely to come into contact with the second conductor, and a short circuit between the conductors can be prevented. In addition, since the first lumen region and the second lumen region are easily connected via the gap, it becomes easier to distribute a fluid such as a sterilizing gas throughout the lumen of the shaft.

[0006] Only one of the shaft and the inner member may have at least one partition portion, and the other may not have a partition portion. The at least one partition portion may extend from the center side of the longitudinal axis of the shaft to the inner wall side of the shaft. The at least one partition portion may extend in the radial direction of the shaft or in the longitudinal direction of the shaft. Also, the entire inner member may be at least one partition portion.

[0007] The at least one partition portion may include a plurality of partition portions, and the plurality of partition portions may be arranged in a circumferential direction of the shaft.

[0008] At least one of the plurality of partitions may be a part of the inner wall of the shaft, in which case at least one of the plurality of partitions of the shaft may be fixed to the inner member.

[0009] At least one of the plurality of partitions may be a part of the inner member. At least one of the plurality of partitions of the inner member may be fixed to an inner wall of the shaft. At least one of the plurality of partitions of the inner member may extend in the longitudinal direction of the shaft, and the at least one partition may not be in contact with the inner wall of the shaft in a part of the longitudinal direction. The inner member may have a cylindrical portion extending in the longitudinal direction of the shaft, and the plurality of partitions may be arranged on the outer periphery of the cylindrical portion.

[0010] At least one partition portion of at least one of the shaft and the inner member divides the lumen of the shaft into at least a first lumen region, a second lumen region, and a third lumen region, and no conductors may be disposed in the third lumen region. At least one partition portion of at least one of the shaft and the inner member divides the lumen of the shaft into at least a first lumen region, a second lumen region, a third lumen region, and a fourth lumen region, and the first lumen region, the third lumen region, the second lumen region, and the fourth lumen region are arranged in this order in the circumferential direction of the shaft, and no conductors may be disposed in the third lumen region and the fourth lumen region.

[0011] The length of the first conductor may be longer than the length of the lumen of the shaft. The inner member may be rotatable relative to the shaft. In the catheter, a voltage of a different polarity from that of the first electrode may be applied to the second electrode when performing defibrillation. Effect of the Invention

[0012] In the catheter according to the present invention, the first conductor disposed in the first lumen region is less likely to move to the second lumen region, and the second conductor disposed in the second lumen region is also less likely to move to the first lumen region. As a result, the first conductor and the second conductor are less likely to come into contact with each other, and a short circuit between the conductors can be prevented. In addition, the first lumen region and the second lumen region are more likely to communicate with each other through the gap, making it easier to distribute a fluid such as a sterilizing gas through the lumen of the shaft. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a side view of a catheter according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view (partial side view) taken along line II-II of the catheter shown in FIG. [Diagram 3] FIG. 2 is a cross-sectional view (partial side view) taken along line III-III of the catheter shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view of the catheter shown in FIG. 3 taken along line IV-IV. [Diagram 5] FIG. 5 is a perspective view of an inner member of the catheter shown in FIGS. 1 to 4. [Figure 6] FIG. 5 is a cross-sectional view showing a modification of the catheter shown in FIG. [Figure 7] FIG. 5 is a cross-sectional view showing another modified example of the catheter shown in FIG. [Figure 8] FIG. 8 is a perspective view of an inner member of the catheter shown in FIG. 7. [Figure 9] FIG. 5 is a cross-sectional view showing another modified example of the catheter shown in FIG. [Figure 10] 10 is a perspective view of an inner member of the catheter shown in FIG. 9. [Figure 11] FIG. 5 is a cross-sectional view showing another modified example of the catheter shown in FIG. [Figure 12] FIG. 12 is a cross-sectional view showing a modification of the catheter shown in FIG. [Figure 13] FIG. 5 is a cross-sectional view showing another modified example of the catheter shown in FIG. [Figure 14] 4 is a cross-sectional view showing a modified example of the shaft and the inner member shown in FIG. 3. [Figure 15] 15 is a cross-sectional view of the shaft and the inner member shown in FIG. 14 along the line XV-XV. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention will be described in more detail below based on the following embodiments, but the present invention is not limited to the following embodiments, and can be modified as long as it meets the purpose described above and below, and all of these modifications are included in the technical scope of the present invention. In addition, hatching and component symbols may be omitted in each drawing for convenience, but in such cases, the specification and other drawings should be referred to. In addition, the dimensions of various components in the drawings may differ from the actual dimensions because priority is given to helping understand the features of the present invention.

[0015] Catheters are used for treating and diagnosing arrhythmias such as atrial fibrillation and ventricular fibrillation. In treating arrhythmias, for example, defibrillation or cauterization of body tissues can be performed by passing a high-frequency current through an electrode of the catheter. In diagnosing arrhythmias, an electrocardiogram can be obtained by inserting a catheter into a patient's body and placing an electrode on or near a tissue to be diagnosed in the heart to measure the potential of the tissue. The catheter may be an intracardiac defibrillation catheter.

[0016] One embodiment of the catheter of the present invention is a shaft extending in a longitudinal direction from a distal end to a proximal end, the shaft having an inner lumen, a first side hole communicating with the inner lumen, and a second side hole proximal to the first side hole, a first electrode disposed on the outside of the first side hole, a second electrode disposed on the outside of the second side hole, a first conductive wire electrically connected to the first electrode and extending through the first side hole into the inner lumen of the shaft, a second conductive wire electrically connected to the second electrode and extending through the second side hole into the inner lumen of the shaft, and and an inner member having a first lumen region and a second lumen region, at least one of the shaft and the inner member having at least one partition portion that divides the lumen of the shaft into at least a first lumen region and a second lumen region, the first lumen region and the second lumen region each extending along the longitudinal axis, the shaft having a gap between the shaft and the inner member, a portion of the gap being smaller than the diameter of the first conductor and smaller than the diameter of the second conductor, the first conductor being disposed in the first lumen region, and the second conductor being disposed in the second lumen region. In the catheter according to the present invention, the lumen of the shaft is divided by the partition portion, and the size of a portion of the gap between the shaft and the inner member is set as described above, so that the first conductor disposed in the first lumen region is less likely to move to the second lumen region, and the second conductor disposed in the second lumen region is also less likely to move to the first lumen region. As a result, the first conductor is less likely to come into contact with the second conductor, and a short circuit between the conductors can be prevented. In addition, since the first lumen region and the second lumen region are easily connected via the gap, it becomes easier to distribute a fluid such as a sterilizing gas throughout the lumen of the shaft.

[0017] An example of the catheter configuration will be described with reference to Figs. 1 to 15. Fig. 1 is a side view of a catheter according to one embodiment of the present invention. Fig. 2 is a cross-sectional view (partially a side view) taken along the line II-II of the catheter shown in Fig. 1. Fig. 3 is a cross-sectional view (partially a side view) taken along the line III-III of the catheter shown in Fig. 1. Fig. 4 is a cross-sectional view (partially a side view) taken along the line IV-IV of the catheter shown in Fig. 3. Fig. 5 is a perspective view of an inner member of the catheter shown in Figs. 1 to 4. Figs. 6 to 7, 9, 11, and 13 are cross-sectional views showing modified examples of the catheter shown in Fig. 4. Fig. 8 is a perspective view of an inner member of the catheter shown in Fig. 7. Fig. 10 is a perspective view of an inner member of the catheter shown in Fig. 9. Fig. 12 is a cross-sectional view showing a modified example of the catheter shown in Fig. 11. Fig. 14 is a cross-sectional view showing a modified example of the shaft and inner member shown in Fig. 3. Fig. 15 is a cross-sectional view taken along the line XV-XV of the shaft and inner member shown in Fig. 14. The catheter 1 has a shaft 2, a first electrode 31, a second electrode 32, a first conductive wire 41, a second conductive wire 42, and an inner member 50.

[0018] The distal side of the catheter 1 refers to the distal end side of the shaft 2 in the longitudinal axis direction x, which is the treatment target side. The proximal side of the catheter 1 refers to the proximal end side of the shaft 2 in the longitudinal axis direction x, which is the hand side of the user. When each member is divided in half in its longitudinal axis direction, the proximal side may be referred to as the proximal portion, and the distal side may be referred to as the distal portion.

[0019] The shaft 2 is a long member having a longitudinal axis direction x, a radial direction, and a circumferential direction p. The shaft 2 extends in the longitudinal axis direction x from the distal end to the proximal end. The catheter 1 is inserted into the patient's body from the distal end side of the shaft 2. A handle 70 that is held by the surgeon is preferably connected to the proximal portion of the shaft 2. The shaft 2 may have a passage therein for a guide wire that guides the advancement of the shaft 2. The catheter 1 may include a guide wire extending in the longitudinal axis direction x.

[0020] The shaft 2 has a lumen 20. The lumen 20 extends in the longitudinal axis direction x. A plurality of lumen 20 may be provided for one shaft 2, but it is preferable that only one lumen 20 is provided. The shaft 2 preferably has a cylindrical structure in order to place a conductor in the lumen 20. The lumen 20 of the shaft 2 is disposed throughout the entire longitudinal axis direction x of the shaft 2, and preferably has openings on both the distal end side and the proximal end side of the shaft 2.

[0021] A tip 72 may be provided at the distal end of the shaft 2. The tip 72 may be made of a conductive material or an insulating material. The tip 72 may cover a part or all of the opening on the distal end side of the shaft 2.

[0022] The shaft 2 is preferably flexible. This allows the shaft 2 to be deformed along the shape of the body cavity. In order to maintain the shape, the shaft 2 is preferably elastic. The shaft 2 is preferably made of resin, metal, or a combination of resin and metal. Examples of the shaft 2 include a resin tube; a metal tube; a hollow body formed by arranging wires in a predetermined pattern; a hollow body in which at least one of the inner surface or outer surface is coated with resin; or a combination of these, for example, a combination of these, for example, a combination of these, which is connected in the longitudinal direction. The resin tube can be manufactured by, for example, extrusion molding. Examples of the hollow body in which the wires are arranged in a predetermined pattern include a cylindrical body having a mesh structure formed by simply crossing or weaving the wires, and a coil in which the wires are wound. The wires may be one or more solid wires, or one or more twisted wires. The cross-sectional shape of the wires may be, for example, a circle, an oval, a polygon, or a combination of these. The oval shape includes an ellipse, an egg, and a rounded rectangle, and the same applies in the following description. The type of the mesh structure is not particularly limited, and the number of turns and density of the coil are also not particularly limited. The mesh structure and the coil may be formed with a constant density over the entire longitudinal direction of the shaft 2, or may be formed so that the density varies depending on the position in the longitudinal direction of the shaft 2. In order to increase the flexibility of the metal tube, a cut or groove may be formed on the outer surface of the metal tube. The shape of the cut or groove may be linear, arc-shaped, annular, spiral, or a combination of these. When the shaft 2 is a cylindrical resin tube, the shaft 2 may be composed of a single layer or multiple layers, and a part in the longitudinal axis direction x or circumferential direction p may be composed of a single layer, and the other part may be composed of multiple layers.

[0023] By using a resin as a constituent material of the shaft 2, it becomes easier to impart flexibility and elasticity to the shaft 2. By using a metal as a constituent material of the shaft 2, it is possible to improve the deliverability of the catheter 1. Examples of resins constituting the shaft 2 include synthetic resins such as polyolefin resins (e.g., polyethylene and polypropylene), polyamide resins (e.g., nylon), polyester resins (e.g., PET), aromatic polyether ketone resins (e.g., PEEK), polyether polyamide resins, polyurethane resins, polyimide resins, fluororesins (e.g., PTFE, PFA, ETFE), vinyl chloride resins, and silicone resins, as well as natural rubber and synthetic rubber. Examples of metals constituting the shaft 2 include stainless steels such as SUS304 and SUS316, carbon steel, platinum, nickel, cobalt, chromium, titanium, tungsten, gold, Ni-Ti alloys, Co-Cr alloys, and combinations thereof. These metals may be used alone or in combination of two or more. The shaft 2 may have a laminated structure made of different materials or the same material.

[0024] The shaft 2 is configured to be bendable. The shaft 2 may be curved in a plane or in a three-dimensional manner. When the shaft 2 is curved in a plane, the distal end and the proximal end of the curved portion of the shaft 2 are on substantially the same plane before and after bending. When the shaft 2 is curved in a three-dimensional manner, the plane on which the distal end and the proximal end of the curved portion of the shaft 2 are located before bending is different from the plane on which they are located after bending. In other words, this means that the shaft 2 is twisted by bending.

[0025] The shaft 2 has a plurality of side holes. The side holes are arranged in the wall of the shaft 2, specifically in the peripheral wall. The side holes are arranged so as to penetrate from the outside of the shaft 2 to the inner cavity 20. A lead wire connected to an electrode can be inserted into the inner cavity 20 through the side hole. In FIG. 2, the shaft 2 has at least a first side hole 11 and a second side hole 12, and the second side hole 12 is located proximally of the first side hole 11. The first side hole 11 and the second side hole 12 communicate with the inner cavity 20 of the shaft 2. The number of side holes arranged in one shaft 2 may be two or more, and can be set according to the number of electrodes. In the catheter 1 shown in FIG. 1 to FIG. 2, the shaft 2 has six side holes proximal to the second side hole 12, although not shown, and an electrode is arranged in each of these side holes.

[0026] The first side hole 11 and the second side hole 12 may be aligned in the longitudinal axis direction x of the shaft 2. In order to facilitate disposing the first conducting wire 41 in the first lumen region 21 and the second conducting wire 42 in the second lumen region 22, the first side hole 11 and the second side hole 12 are preferably disposed at different positions in the circumferential direction p of the shaft 2. For example, the centers of the first side hole 11 and the second side hole 12 in the circumferential direction p are preferably shifted by 45° or more, more preferably by 60° or more, and even more preferably by 90° or more, and may be shifted by 180° or less, 140° or less, or 120° or less. In FIG. 2, the centers of the first side hole 11 and the second side hole 12 in the circumferential direction p are shifted by 180°.

[0027] The shape of the side hole when the shaft 2 is viewed in a direction perpendicular to the longitudinal axis direction x can be a circle, an oval, a polygon, or a combination of these. The side hole may have a central axis that coincides with the radial direction of the shaft 2, or may be disposed such that the central axis extends from the outer side to the inner side in the radial direction from the distal side to the proximal side of the shaft 2.

[0028] An electrode is disposed on the outside of the side hole of the shaft 2. The electrode can have at least one of the functions of defibrillation, cauterization, potential measurement, and reference during potential measurement. The reference electrode is, for example, a ground electrode. In FIG. 2, a first electrode 31 is disposed on the outside of the first side hole 11, and a second electrode 32 is disposed on the outside of the second side hole 12. In FIGS. 1 and 2, the first electrode 31 is the most distal electrode, but it is not essential that it is the most distal electrode. In FIGS. 1 and 2, the second electrode 32 is an electrode one electrode closer to the proximal side than the first electrode 31, but another electrode may be disposed between the first electrode 31 and the second electrode 32.

[0029] In addition to the first electrode 31 and the second electrode 32, the catheter 1 may have one or more electrodes. In Fig. 1, the third electrode 33, the fourth electrode 34, the fifth electrode 35, the sixth electrode 36, the seventh electrode 37, and the eighth electrode 38 are arranged in this order proximally from the second electrode 32 toward the proximal side. The eighth electrode 38 is the most proximal electrode. It is preferable that one electrode is arranged on the outside of each of the side holes that the shaft 2 has.

[0030] The electrode may be shaped, for example, as a ring, a ring with a slit in it that has a C-shaped cross section, or a coil made of wound wire. The electrode can be attached to the shaft 2 by crimping the electrode from the outside of the shaft 2. The electrode may be a sheet, thin plate, or chip of any shape disposed on the shaft 2.

[0031] The electrodes may be made of any conductive material, such as metal or a mixture containing a resin and a metal. In particular, the electrodes may be made of conductive resin, platinum, platinum-iridium alloy, stainless steel, tungsten, or other metals. When the electrodes are made of conductive resin, a contrast agent such as barium sulfate or bismuth oxide may be mixed into the resin.

[0032] The conductor wire electrically connects the electrode to an external device of the catheter 1, such as a defibrillation power supply device, a cauterization power supply device, an electrocardiograph, etc. The conductor wire is electrically connected to the electrode and extends through the side hole into the lumen 20. It is preferable that the conductor wire is arranged outside the inner member 50 in the shaft 2. That is, it is preferable that the conductor wire is not arranged so as to be contained in the inner member 50. In FIG. 2, the first conductor wire 41 is electrically connected to the first electrode 31 and extends through the first side hole 11 into the lumen 20 of the shaft 2. The second conductor wire 42 is electrically connected to the second electrode 32 and extends through the second side hole 12 into the lumen 20 of the shaft 2. In this way, it is preferable that one conductor wire is connected to one electrode. For simplification, only the first conductor wire 41 and the second conductor wire 42 are shown in FIG. 3 and FIG. 4, but conductor wires are also connected to the third electrode 33 to the eighth electrode 38.

[0033] The conductor may be any wire that is conductive, and may be, for example, a copper wire, an iron wire, a stainless steel wire, a piano wire, a tungsten wire, or a nickel titanium wire. In order to prevent a short circuit with adjacent members, the conductor may be covered with a covering material such as a covering tube except for both ends in the longitudinal direction. The covering material may be made of an insulating material. The electrodes and the conductor may be connected by a method such as laser welding, resistance welding, or bonding with an adhesive.

[0034] The length of the conductors is not particularly limited, but the length of each conductor may be longer or shorter than the length of the lumen 20 of the shaft 2. For example, the length of the first conductor 41 may be longer than the length of the lumen 20 of the shaft 2. Also, the length of the second conductor 42 may be longer than the length of the lumen 20 of the shaft 2. Even if the conductors are longer than the lumen 20 of the shaft 2 and therefore prone to bending in the lumen 20, the presence of the partition can prevent short circuits between the conductors.

[0035] The inner member 50 is disposed in the lumen 20 of the shaft 2. The inner member 50 may function as a partition member that partitions the lumen 20. Alternatively, the inner member 50 may function as a housing member that houses an operating wire or an elastic member for bending the shaft 2, or a guide wire that guides the advancement of the shaft 2.

[0036] As shown in Figures 2 and 3, the inner member 50 has a distal end 51 and a proximal end 52. The shape of the inner member 50 is not particularly limited, but it is preferably a long member extending in the longitudinal axis direction x of the shaft 2. The inner member 50 as a whole may have, for example, a cylindrical shape, a plate shape, a shape in which a part of a plate is bent, a coil shape, a shape having a longitudinal direction and a width direction perpendicular to the longitudinal direction and the width size varies depending on the position in the longitudinal direction (for example, a fishbone shape), or a shape that is a combination of these shapes. Figures 2 to 5 show an example in which the inner member is in the shape of a long and thin plate.

[0037] The inner member 50 is preferably disposed only in a portion of the shaft 2 in the longitudinal axis direction x. In addition, the inner member 50 is preferably not disposed over the entire shaft 2 in the longitudinal axis direction x.

[0038] The distal end 51 of the inner member 50 may coincide with the distal end of the shaft 2. Alternatively, as shown in Figure 2, the distal end 51 of the inner member 50 may be located proximal to the distal end of the shaft 2, or may be located distal to the distal end of the most distal side hole (first side hole 11 in Figure 2). The inner member 50 may be disposed inside the distal tip 72.

[0039] 3, the proximal end 52 of the inner member 50 may be located proximal to the proximal end of the most proximal side hole. The proximal end 52 of the inner member 50 may be located distal to the proximal end of the shaft 2. Alternatively, the inner member 50 may extend from the proximal end of the shaft 2, and the proximal end 52 of the inner member 50 may be located proximal to the proximal end of the shaft 2. In this case, a portion of the inner member 50 is disposed inside the handle 70.

[0040] It is preferable that the inner member 50 bends as the shaft 2 bends. For this reason, it is preferable that the inner member 50 has flexibility. The inner member 50 may also have elasticity. The inner member 50 may be made of the materials listed as the preferable materials for the shaft 2. The material for the inner member 50 may be the same as or different from the material for the shaft 2.

[0041] In the catheter 1, at least one of the shaft 2 and the inner member 50 has at least one partition that divides the lumen 20 of the shaft 2 into at least a first lumen region 21 and a second lumen region 22. The first lumen region 21 and the second lumen region 22 each extend along the longitudinal axis direction x. The shaft 2 has a gap between itself and the inner member 50, and a part of the gap is smaller than the diameter of the first conducting wire 41 and smaller than the diameter of the second conducting wire 42. The first conducting wire 41 is disposed in the first lumen region 21, and the second conducting wire 42 is disposed in the second lumen region 22. Here, the part of the gap means at least one of the multiple gaps when multiple gaps exist. For example, in FIG. 4, the shaft 2 has at least gaps 181 and 182. The size 181D of the gap 181 is smaller than the diameter of the first conducting wire 41 and smaller than the diameter of the second conducting wire 42. The size 182D of the gap 182 is smaller than the diameter of the first conducting wire 41 and smaller than the diameter of the second conducting wire 42. The first conducting wire 41 arranged in the first lumen region 21 is difficult to move to the second lumen region 22 because it cannot pass through the gaps 181 and 182, and the second conducting wire 42 arranged in the second lumen region 22 is difficult to move to the first lumen region 21 because it cannot pass through the gaps 181 and 182. Therefore, the first conducting wire 41 and the second conducting wire 42 are difficult to contact each other, and a short circuit between the conducting wires can be prevented. Furthermore, since the first lumen region 21 and the second lumen region 22 are in communication with each other through the gaps 181 and 182, it is easy to distribute a fluid such as a sterilization gas through the lumen 20 of the shaft 2.

[0042] At least one of the shaft 2 and the inner member 50 may have at least one partition portion, and at least one of the shaft 2 and the inner member 50 may have multiple partition portions. In Figures 2 to 10 and Figures 14 to 15, the inner member 50 has a partition portion, in Figures 11 to 12, the shaft 2 has a partition portion, and in Figure 13, the shaft 2 and the inner member 50 each have a partition portion.

[0043] 2 to 12 and 14 to 15, it is preferable that only one of the shaft 2 and the inner member 50 has at least one partition portion, and the other does not have a partition portion. This makes it easier to adjust the size of the gap between the shaft 2 and the inner member 50, since the inner cavity 20 is partitioned only by either the shaft 2 or the inner member 50.

[0044] The number of lumen regions formed by the partitions may be 2 or more, may be 3 or more, 4 or more, or may be 8 or less, or 7 or less. The multiple lumen regions are preferably aligned in the circumferential direction p of the shaft. The multiple lumen regions are preferably in communication with each other via gaps.

[0045] When at least one partition divides the lumen 20 of the shaft 2 into at least the first lumen region 21, the second lumen region 22, and the third lumen region 23, it is preferable that the first conducting wire 41 is arranged in the first lumen region 21, the second conducting wire 42 is arranged in the second lumen region 22, and no conducting wire is arranged in the third lumen region 23. This allows a member other than the first conducting wire 41 and the second conducting wire 42 to be arranged in the third lumen region 23. In Figs. 7 and 8, the inner member 50 has a first partition 531, a second partition 532, and a third partition 533. The first partition 531 divides the lumen 20 into a first lumen region 21 and a second lumen region 22, the second partition 532 divides the lumen 20 into a second lumen region 22 and a third lumen region 23, and the third partition 533 divides the lumen 20 into the third lumen region 23 and the first lumen region 21.

[0046] At least one partition divides the lumen 20 of the shaft 2 into at least a first lumen region 21, a second lumen region 22, a third lumen region 23, and a fourth lumen region 24, and the first lumen region 21, the third lumen region 23, the second lumen region 22, and the fourth lumen region 24 are arranged in this order in the circumferential direction p of the shaft 2, and it is preferable that no conductor is arranged in the third lumen region 23 and the fourth lumen region 24. The third lumen region 23 and the fourth lumen region 24 can separate the first lumen region 21 and the second lumen region 22, so that the first conductor 41 and the second conductor 42 are less likely to come into contact with each other. Also, a member other than the conductor can be arranged in the third lumen region 23 and the fourth lumen region 24. 9 and 10, the inner member 50 has a first partition portion 531, a second partition portion 532, a third partition portion 533, and a fourth partition portion 534. These partition portions 531 to 534 divide the inner cavity 20 into four portions, a first lumen region 21 to a fourth lumen region 24, as shown in FIG. 9. The first partition portion 531 provides a gap 181 between the inner wall 5 of the shaft 2 and the inner member 50. Similarly, the second partition portion 532, the third partition portion 533, and the fourth partition portion 534 provide gaps 182, 183, and 184, respectively.

[0047] For example, as shown in Figures 7, 9, 11 and 12, it is preferable that a gap smaller than the diameter of all the conductors of the catheter 1 is provided between two lumen regions adjacent to each other in the circumferential direction p. By providing a partition portion so as to form a gap in this manner, it is possible to prevent a short circuit between the conductors connected to electrodes to which voltages of different polarities are applied.

[0048] The inner member 50 may be movable relative to the shaft 2. The movement of the inner member 50 allows the conductors to move appropriately, thereby preventing tension on the conductors due to bending of the shaft 2 or the inner member 50. The inner member 50 may be slidable in the longitudinal axis direction x relative to the shaft 2, and the inner member 50 may be rotatable relative to the shaft 2.

[0049] The inner member 50 may be disposed in the lumen 20 so as to rotate about the longitudinal axis of the shaft 2. However, the rotation range of the inner member 50 relative to the shaft 2 is preferably 90° or less, more preferably 60° or less, and even more preferably 45° or less, so that the first conducting wire 41 and the second conducting wire 42 can move only within a certain range within the shaft 2. However, the rotation range of the inner member 50 relative to the shaft 2 may be 5° or more, 10° or more, or 20° or more.

[0050] The inner member 50 may be fixed to be movable relative to the shaft 2. The inner member 50 may be fixed to be rotatable relative to the shaft 2. For example, the inner member 50 may have an engaging portion, and the shaft 2 may have an engaged portion that engages with the engaging portion.

[0051] In order to prevent the conductor wires from being crushed due to excessive misalignment of the inner member 50, the inner member 50 may be fixed to the shaft 2 so as not to slide in the longitudinal axis direction x relative to the shaft 2. For the same purpose, the inner member 50 may be fixed to the shaft 2 so as not to rotate relative to the shaft 2.

[0052] In the following, a configuration common to the partitioning portion disposed in the shaft 2 and the partitioning portion disposed in the inner member 50 will be described. It is preferable that at least one partitioning portion extends from the center side of the longitudinal axis of the shaft 2 to the inner wall 5 side of the shaft 2. With this configuration, it is possible to partition the inner cavity 20 so that each lumen area has an appropriate size while preventing an increase in the profile of the shaft 2. For example, in FIG. 6, two partitioning portions 531 and 532 possessed by the inner member 50 extend so as to protrude from the center side of the longitudinal axis of the shaft 2 toward the inner wall 5 side. In FIG. 11, four partitioning portions 161 to 164 possessed by the shaft 2 extend so as to protrude from the inner wall 5 of the shaft 2 toward the center side of the longitudinal axis.

[0053] In a cross section perpendicular to the longitudinal axis direction x of the shaft 2, the partition portion may extend linearly or curvedly. In addition, in a cross section perpendicular to the longitudinal axis direction x of the shaft 2, the partition portion may extend so as to curve in the circumferential direction p of the shaft 2. For example, the partition portion may extend so that the position of the partition portion in the circumferential direction p changes from the longitudinal axis center side of the shaft 2 to the inner wall 5 side of the shaft 2.

[0054] At least one partition portion preferably extends in the radial direction of the shaft 2. With this configuration, the lumen 20 can be partitioned so that each lumen area has an appropriate size while preventing an increase in the profile of the shaft 2. For example, in FIG. 4, the partition portion 53 extends in the radial direction of the shaft 2. The inner member 50 is disposed within the shaft 2 so that the partition portion 53 passes through the center of the longitudinal axis of the shaft 2.

[0055] 2 to 3, 5, 8, and 10, at least one partition portion preferably extends in the longitudinal axis direction x of the shaft 2. This makes it easier to prevent short circuits between the conductors over a wide range in the longitudinal axis direction x of the shaft 2.

[0056] The partitioning portion is preferably disposed only in a part of the longitudinal axis direction x of the shaft 2. In addition, the partitioning portion is preferably not disposed over the entirety of the longitudinal axis direction x of the shaft 2.

[0057] It is preferable that at least a part of the partition is disposed proximally of the most proximal side hole. For example, in Fig. 3, the partition 53 is disposed to a position proximal to the most proximal side hole. This makes it possible to prevent a short circuit between the conductors in the proximal portion of the shaft 2. Note that the proximal end of the partition may be disposed distal to the proximal end of the most proximal side hole.

[0058] At least a part of the partitioning portion may be disposed distal to the most proximal side hole, or may be disposed distal to the most distal side hole. For example, in Fig. 2, the distal end of partitioning portion 53 is disposed distal to the distal end of the most distal first side hole 11. This configuration makes it possible to prevent short circuits between the conductors over a wide range of shaft 2.

[0059] Since the number of conductors present in the shaft 2 increases toward the proximal end of the shaft 2, it is preferable that the partition portion is disposed in the proximal portion of the shaft 2. The partition portion does not have to be disposed distal to the proximal end of the most proximal side hole. In addition, when the catheter 1 has one or more electrodes other than the first electrode 31 and the second electrode 32, the partition portion does not have to be disposed distal to the proximal end of the side hole located on the inside of the electrode to which a voltage of the same polarity as the first electrode 31 is applied.

[0060] For example, at least one partition portion may have multiple partition portions as shown in Figures 6, 7, and 9. This configuration makes it easier to divide the lumen 20 of the shaft 2 into multiple lumen regions. The number of partition portions arranged in the lumen 20 of the shaft 2 may be 1 or more, is preferably 2 or more, may be 3 or more, 4 or more, and is also permissible to be 8 or less, 7 or less.

[0061] At least one of the partitioning portions preferably extends from the distal end of the most distal side hole to the proximal end of the most proximal side hole, and more preferably, all of the partitioning portions extend from the distal end of the most distal side hole to the proximal end of the most proximal side hole.

[0062] The multiple partition parts are preferably arranged in the circumferential direction p of the shaft 2. This configuration makes it easier to divide the lumen 20 of the shaft 2 into multiple lumen regions. The multiple partition parts may be arranged at equal intervals in the circumferential direction p of the shaft 2. For example, in Fig. 6, the centers of two partition parts 531, 532 are positioned 180° apart in the circumferential direction p, in Fig. 7, the centers of three partition parts 531 to 533 are positioned 120° apart, and in Fig. 9, the centers of four partition parts 531 to 534 are positioned 90° apart.

[0063] The multiple partition parts may be arranged so as to go around from the distal end side to the proximal end side of the shaft 2. For example, the multiple partition parts may be arranged in a spiral shape. In this case, each lumen region also extends in a spiral shape.

[0064] When viewed from the longitudinal axis direction x of the shaft 2, the multiple partition parts may have a rotationally symmetric shape, or may have a line-symmetric shape with respect to a line passing through the center of the longitudinal axis of the shaft 2. The multiple partition parts may each have the same shape, or may have different shapes.

[0065] In the following, an example in which the shaft 2 has at least one partitioning portion will be described. It is preferable that at least one partitioning portion is arranged on the inner wall 5 of the shaft 2, and more preferable that a plurality of partitioning portions are arranged on the inner wall 5 of the shaft 2. It is further preferable that at least one of the plurality of partitioning portions of the shaft 2 is a part of the inner wall 5 of the shaft 2. With this configuration, the size of the gap between the shaft 2 and the inner member 50 can be adjusted by changing the structure of the shaft 2. In Figs. 11 and 12, four partitioning portions 161 to 164 are arranged on the inner wall 5 of the shaft 2. In Fig. 11, a gap 181 is arranged between the partitioning portion 161 and the inner member 50 by the partitioning portion 161. Similarly, gaps 182, 183, and 184 are arranged by the partitioning portions 162, 163, and 164, respectively. In Fig. 12, gaps 181, 182, and 183 are arranged by the partitioning portions 161, 162, and 163, respectively.

[0066] The partitions of the shaft 2 are preferably convex portions protruding from the inner wall 5 side of the shaft 2 toward the center of the longitudinal axis of the shaft 2. The convex portions may be projections or ridges extending in the longitudinal axis direction x of the shaft 2.

[0067] In a cross section perpendicular to the longitudinal axis direction x of the shaft 2, the partition portion of the shaft 2 may have a shape that tapers toward the center of the longitudinal axis of the shaft 2.

[0068] It is preferable that the gap between the partitioning portion of the shaft 2 and the inner member 50 is smaller than the diameter of the first conducting wire 41 and smaller than the diameter of the second conducting wire 42. It is more preferable that the gaps between all of the partitioning portions of the shaft 2 and the inner member 50 are smaller than the diameters of all of the conducting wires.

[0069] 11, it is preferable that the gap between the outer end of the partition portion in the radial direction of the shaft 2 and the outer surface of the inner member 50 is smaller than the diameter of the first conducting wire 41 and smaller than the diameter of the second conducting wire 42. It is more preferable that, for all partition portions that the shaft 2 has, the gap between the outer end of the partition portion in the radial direction of the shaft 2 and the outer surface of the inner member 50 is smaller than the diameter of all the conducting wires.

[0070] At least one partition part of the shaft 2 may be in contact with the inner member 50. For example, at least one partition part of the shaft 2 may be fixed to the inner member 50, or at least one of the partition parts of the shaft 2 may be fixed to the inner member 50. Since the inner member 50 is less likely to move relative to the shaft 2, the size of each lumen area is maintained during use of the catheter 1, and as a result, the first conducting wire 41 and the second conducting wire 42 are less likely to be crushed. In FIG. 12, four partition parts 161 to 164 are arranged on the inner wall 5 of the shaft 2 as in FIG. 11, but the partition part 164 is fixed to the outer surface of the inner member 50, and there is no gap between the partition part 164 and the inner member 50, which is different from the embodiment in FIG. 11.

[0071] At least one of the multiple partition sections of the shaft 2 may be fixed to the inner member 50, and the rest may not be fixed to the inner member 50. With regard to the partition sections of the shaft 2 fixed to the inner member 50, only a portion of the partition section in the longitudinal direction may be fixed to the inner member 50, or the entire partition section in the longitudinal direction may be fixed to the inner member 50.

[0072] At least one of the multiple partition parts of the shaft 2 preferably extends in the longitudinal axis direction x, and the at least one partition part is not in contact with the inner member 50 in a part of the longitudinal axis direction x. A gap can be formed between the inner wall 5 of the shaft 2 and the partition part not in contact with the inner member 50.

[0073] At least one of the multiple partitioning parts of the shaft 2 may be entirely fixed in the longitudinal axis direction x to the inner member 50. In this case, it is preferable that the number of partitioning parts fixed to the inner member 50 is smaller than the number of partitioning parts not fixed to the inner member 50. This makes it easier to position the inner member 50 inside the shaft 2 so that the inner member 50 does not move relative to the shaft 2, while communicating the first lumen region 21 and the second lumen region 22 through the gap.

[0074] All of the partition portions of the shaft 2 may be fixed to the inner member 50. In that case, it is preferable that at least one partition portion of the shaft 2 is fixed to the inner member 50 only in a portion of its longitudinal axis direction x. In other words, it is preferable that a gap exists between at least one partition portion and the inner member 50.

[0075] In the following, an example will be described in which the inner member 50 has at least one partition portion. It is more preferable that a plurality of partition portions are arranged in the inner member 50 as shown in Figs. 2 to 10 and Figs. 14 to 15. It is further preferable that at least one of the plurality of partition portions is a part of the inner member 50. By changing the configuration of the inner member 50, the size of the gap between the shaft 2 and the inner member 50 can be adjusted.

[0076] When the inner member 50 has a partition portion, the partition portion may be arranged only in a portion of the inner member 50 in the longitudinal direction, or the partition portion may be arranged over the entire longitudinal direction of the inner member 50 as shown in Figures 5, 8, and 10.

[0077] The partition portion of the inner member 50 is preferably a convex portion extending so as to protrude from the center side of the longitudinal axis of the shaft 2 toward the inner wall 5 side of the shaft 2. The convex portion may be a projection or a ridge extending in the longitudinal axis direction x of the shaft 2.

[0078] In a cross section perpendicular to the longitudinal axis direction x of the shaft 2, the partition portion of the inner member 50 may have a shape that tapers toward the inner wall 5 side of the shaft 2.

[0079] At least a part of the inner member 50 may be at least one partition portion. Also, the entire inner member 50 may be at least one partition portion. This configuration allows the space inside the shaft 2 to be used effectively. For example, in Figs. 2 to 5, the inner member 50 has one partition portion 53 having a long, flat plate shape. By disposing the inner member 50 in the lumen 20, one side of the partition portion 53 can be divided into a first lumen region 21 and the other side of the partition portion 53 can be divided into a second lumen region 22.

[0080] The inner member 50 may be configured by combining at least one plate-shaped partition. The thickness of the partition of the inner member 50 may be constant as shown in Figures 4 to 5, or may have a portion that becomes thinner from the center side of the longitudinal axis of the shaft 2 toward the inner wall 5 of the shaft 2 as shown in Figures 6 to 10. At least one of the multiple partitions of the inner member 50 may have a constant thickness, and the rest may have a portion that becomes thinner toward the inner wall 5 of the shaft 2.

[0081] The inner member 50 preferably has a cylindrical portion extending in the longitudinal axis direction x of the shaft 2, and a plurality of partitions are arranged on the outer periphery of the cylindrical portion. In Figs. 9 and 10, four partitions 531-534 are arranged around the cylindrical portion 54. Each of the partitions 531-534 is a protrusion extending in the longitudinal axis direction x. With this configuration, a member such as a guide wire can be passed through the inner cavity 55 of the cylindrical portion 54, and the partitions 531-534 make it difficult for the first conducting wire 41 and the second conducting wire 42 to come into contact with each other.

[0082] 4, 6, 7 and 9, it is preferable that the gap between the partitioning portions of the inner member 50 and the shaft 2 is smaller than the diameter of the first conducting wire 41 and smaller than the diameter of the second conducting wire 42. It is more preferable that the gaps between all of the partitioning portions of the inner member 50 and the shaft 2 are smaller than the diameters of all of the conducting wires.

[0083] 4, 6, 7, and 9, it is preferable that the gap between the outer end of the partition portion of the inner member 50 and the inner wall 5 of the shaft 2 in the radial direction of the shaft 2 is smaller than the diameter of the first conducting wire 41 and smaller than the diameter of the second conducting wire 42. It is more preferable that for all the partition portions of the inner member 50, the gap between the outer end of the partition portion and the inner wall 5 of the shaft 2 in the radial direction of the shaft 2 is smaller than the diameter of all the conducting wires.

[0084] 7, when the first lumen region 21, the second lumen region 22, and the third lumen region 23 are arranged in this order in the circumferential direction p of the shaft 2, it is preferable that a gap 181 between the outer end of the first partition portion 531 and the inner wall 5 of the shaft 2 in the radial direction of the shaft 2 is smaller than each diameter of the first conducting wire 41 and the second conducting wire 42. At least one of a gap 182 between the outer end of the second partition portion 532 and the inner wall 5 of the shaft 2 and a gap 183 between the outer end of the third partition portion 533 and the inner wall 5 of the shaft 2 in the radial direction of the shaft 2 may be larger than each diameter of the first conducting wire 41 and the second conducting wire 42.

[0085] At least one partition part of the inner member 50 may be in contact with the shaft 2. For example, at least one partition part of the inner member 50 may be fixed to the inner wall 5 of the shaft 2, or at least one of the multiple partition parts may be fixed to the inner wall 5 of the shaft 2. Since the inner member 50 is less likely to move relative to the shaft 2, the size of each lumen area is maintained during use of the catheter 1, and as a result, the first conducting wire 41 and the second conducting wire 42 are less likely to be crushed. For example, in Figs. 14 to 15, the inner member 50 has partition parts 531 and 532 on the outer periphery of the tubular part 54, and in the cross section shown in Fig. 15, the partition part 532 is fixed to the inner wall 5 of the shaft 2.

[0086] At least one of the multiple partition sections of the inner member 50 may be fixed to the shaft 2, and the rest may not be fixed to the shaft 2. With regard to the partition sections of the inner member 50 fixed to the shaft 2, only a portion of the partition section in the longitudinal direction may be fixed to the shaft 2, or the entire partition section in the longitudinal direction may be fixed to the shaft 2.

[0087] 14, it is preferable that at least one of the multiple partition parts of the inner member 50 extends in the longitudinal axis direction x of the shaft 2, and that at least one partition part is not in contact with the inner wall 5 of the shaft 2 over a part of the longitudinal axis direction x. With this configuration, a gap can be formed between the inner member 50 and the partition part that is not in contact with the inner wall 5.

[0088] At least one of the multiple partition parts of the inner member 50 may be entirely fixed to the shaft 2 in the longitudinal axis direction x. In this case, it is preferable that the number of partition parts fixed to the shaft 2 is smaller than the number of partition parts not fixed to the shaft 2. This makes it easier to position the inner member 50 within the shaft 2 so that the inner member 50 does not move relative to the shaft 2, while communicating the first lumen region 21 and the second lumen region 22 via the gap.

[0089] All of the partition parts of the inner member 50 may be fixed to the shaft 2. In that case, it is preferable that at least one partition part of the inner member 50 is fixed to the shaft 2 only in a portion of its longitudinal axis direction x. In other words, it is preferable that a gap exists between at least one partition part and the shaft 2.

[0090] Although all the partitions of the inner member 50 may be fixed to the shaft 2, it is preferable that only a part of each partition of the inner member 50 in the longitudinal axis direction x is fixed to the inner wall 5 of the shaft 2 as shown in FIG. 14. That is, it is preferable that there are parts where there is a gap and parts where there is no gap between the shaft 2 and all the partitions of the inner member 50. Since the first lumen region 21 and the second lumen region 22 communicate with each other through the gap, it becomes easier to distribute a fluid such as a sterilization gas in the lumen 20 of the shaft 2. In addition, the parts where there is no gap, i.e., the fixed parts, can prevent the inner member 50 from being displaced in the shaft 2.

[0091] Fig. 13 shows an example in which the shaft 2 has a partition portion 16, and the inner member 50 has a partition portion 53. In Fig. 13, the partition portions 16, 53 are arranged so as to be furthest apart in the circumferential direction p, but the partition portions 16, 53 may be arranged so as to face each other. The number of partition portions of the shaft 2 and the inner member 50 may be the same, or one of them may be greater than the other. For the configuration of the partition portions 16, 53, the explanations of the embodiment in which only the shaft 2 has partition portions or the embodiment in which only the inner member 50 has partition portions can be referred to as appropriate.

[0092] Defibrillation may be performed using the catheter 1. When performing defibrillation, it is preferable that a voltage of a different polarity from that of the first electrode 31 is applied to the second electrode 32. Since the partition portion makes it difficult for the first conducting wire 41 and the second conducting wire 42 to come into contact with each other, even if voltages of different polarities are applied to the first electrode 31 and the second electrode 32, a short circuit between the first conducting wire 41 and the second conducting wire 42 can be prevented.

[0093] When the catheter 1 has one or more electrodes other than the first electrode 31 and the second electrode 32, it is preferable that a conductor connected to an electrode to which a voltage of the same polarity as the first electrode 31 is applied is arranged in the first lumen region 21, and a conductor connected to an electrode to which a voltage of the same polarity as the second electrode 32 is applied is arranged in the second lumen region 22. This makes it possible to prevent a short circuit between the conductors. A plurality of conductors may be arranged in each of the first lumen region 21 and the second lumen region 22. [Explanation of symbols]

[0094] 1: Catheter 2: Shaft 5:Inner wall 11: 1st side hole, 12: 2nd side hole 16, 161, 162, 163, 164: Partition 181, 182, 183, 184: Gap 20: lumen 21: First lumen region, 22: Second lumen region, 23: Third lumen region, 24: Fourth lumen region 31: 1st electrode, 32: 2nd electrode 41: 1st conductor, 42: 2nd conductor 50: Inner member 53, 531, 532, 533, 534: Partition 54: Cylindrical part

Claims

1. a shaft extending in a longitudinal direction from a distal end to a proximal end, the shaft having an inner cavity, a first side hole communicating with the inner cavity, and a second side hole proximal to the first side hole; a first electrode disposed outside the first side hole; a second electrode disposed outside the second side hole; a first conductive wire electrically connected to the first electrode and extending through the first side hole into the lumen of the shaft; a second conductor electrically connected to the second electrode and extending through the second side hole into the lumen of the shaft; an inner member disposed in the lumen of the shaft; the inner member has a plurality of partitions dividing the lumen of the shaft into at least a first lumen region and a second lumen region; The first lumen region and the second lumen region each extend along the longitudinal axis; the partition portion is a portion extending from a center side of a longitudinal axis of the shaft to an inner wall side of the shaft, and in a cross section perpendicular to the longitudinal axis direction of the shaft, the entire partition portion has a shape that tapers from the center side of the longitudinal axis of the shaft to the inner wall side of the shaft, The shaft has a gap between it and the inner member, a portion of the gap is smaller than a diameter of the first conductor and smaller than a diameter of the second conductor; the first conductor is disposed in the first lumen region; A catheter having the second lead disposed in the second lumen region.

2. The catheter according to claim 1 , wherein the partition portion extends in a radial direction of the shaft.

3. The catheter according to claim 1 or 2, wherein the partition portion extends in a longitudinal axis direction of the shaft.

4. A catheter described in any one of claims 1 to 3, wherein the multiple partition portions are arranged circumferentially around the shaft.

5. The inner member has a tubular portion extending in a longitudinal direction of the shaft, The catheter according to any one of claims 1 to 4, wherein the plurality of partition portions are arranged on an outer periphery of the tubular portion.

6. The catheter according to any one of claims 1 to 5, wherein at least one of the plurality of partition sections is fixed to an inner wall of the shaft.

7. The catheter according to claim 6 , wherein at least one of the plurality of partition sections extends in the longitudinal direction of the shaft and does not contact the inner wall of the shaft along a portion of the longitudinal direction.

8. The catheter according to any one of claims 1 to 7, wherein the length of the first conducting wire is longer than the length of the lumen of the shaft.

9. the plurality of partition portions partition the inner cavity of the shaft into at least the first inner cavity region, the second inner cavity region, and a third inner cavity region; The catheter of any one of claims 1 to 8, wherein no conductor wires are disposed in the third lumen region.

10. the plurality of partition portions partition the inner cavity of the shaft into at least the first inner cavity region, the second inner cavity region, a third inner cavity region, and a fourth inner cavity region; the first lumen region, the third lumen region, the second lumen region, and the fourth lumen region are arranged in this order in a circumferential direction of the shaft, The catheter according to any one of claims 1 to 8, wherein no conductor wires are disposed in the third lumen region and the fourth lumen region.

11. The catheter of any one of claims 1 to 5, wherein the inner member is rotatable relative to the shaft.

12. 12. The catheter according to claim 1, wherein, when performing defibrillation, a voltage having a polarity different from that of the first electrode is applied to the second electrode.

Images