Catheter

Abstract

Provided is a catheter with which it is easy to determine the orientation within a body. The catheter has: a first tubular member; a second tubular member adjacent to the first tubular member in the radial direction; an outer tubular member having a fixed part that includes a part of the first tubular member and is fixed to the first tubular member, and a non-fixed part that is positioned on a proximal side relative to the fixed part and is not fixed to the first tubular member; a first linear member at least a part of which is disposed in the outer tubular member; a second linear member at least a part of which is disposed in the outer tubular member. In a side view of the catheter, in a field of view in which the central axis of the first tubular member and the central axis of the second tubular member do not overlap, the second linear member has an intersection part that intersects the first linear member on the proximal side relative to the fixed part of the outer tubular member.

Description

Catheter 【0001】 This disclosure relates to a catheter. 【0002】 A catheter that can be inserted into a blood vessel or the like to examine and treat a diseased part of the human body is used. As such a catheter, for example, in Patent Document 1, there is a first cylindrical member that extends in the longitudinal direction, has a distal end and a proximal end, and into which a wire is inserted, and a second cylindrical member that has a distal end and a proximal end and is adjacent to the first cylindrical member in the radial direction. The distal end of the first cylindrical member is located closer to the proximal side than the distal end of the second cylindrical member, and the proximal end of the first cylindrical member is located closer to the proximal side than the proximal end of the second cylindrical member. The first cylindrical member has a reinforcing portion having an inner layer containing at least one selected from the group consisting of polytetrafluoroethylene and a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and a reinforcing member, and the first cylindrical member has an extending portion made of a resin that does not contain the polytetrafluoroethylene, the copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and the reinforcing member on the distal side of the distal end of the reinforcing portion. A catheter is disclosed. 【0003】 International Publication No. 2020 / 255737 【0004】 As a result of the study by the present inventor, it has been found that it is difficult to grasp the orientation of a conventional catheter in the body. The problem to be solved by this disclosure is to provide a catheter whose orientation in the body can be easily grasped. 【0005】The catheter according to the embodiment of this disclosure that is able to solve the above problems is as follows: [1] A catheter comprising: a first cylindrical member extending in the longitudinal direction; a second cylindrical member extending in the longitudinal direction and radially adjacent to the first cylindrical member; an outer cylindrical member extending in the longitudinal direction, enclosing a part of the first cylindrical member and having a fixed portion fixed to the first cylindrical member and an unfixed portion located proximal to the fixed portion and not fixed to the first cylindrical member; a first linear member extending in the longitudinal direction and at least a part of which is disposed within the outer cylindrical member; and a second linear member extending in the longitudinal direction and at least a part of which is disposed within the outer cylindrical member, with its distal end located distal to the distal end of the first linear member, wherein the distal end of the first cylindrical member is located proximal to the distal end of the second cylindrical member, and the proximal end of the first cylindrical member is located proximal to the proximal end of the second cylindrical member. A catheter in which, in a side view of the catheter, in a field of view where the central axis of the first cylindrical member and the central axis of the second cylindrical member do not overlap, the second linear member has an intersection portion that intersects the first linear member proximal to the fixing portion of the outer cylindrical member. 【0006】 With the above configuration, for example, under X-ray fluoroscopy, it becomes easier to determine the orientation of the catheter within the body by using information about the intersection where the first linear member and the second linear member intersect. 【0007】Furthermore, the catheter according to the embodiment is preferably any one of the following [2] to

[20] . [2] The catheter according to [1], in a side view of the catheter, in a field of view where the central axis of the first cylindrical member and the central axis of the second cylindrical member overlap, the second linear member does not have an intersection portion that intersects the first linear member proximal to the fixing portion of the outer cylindrical member. [3] The catheter according to [1] or [2], wherein the outer cylindrical member is located proximal to the proximal end of the second cylindrical member. [4] The catheter according to any one of the following [1] to [3], wherein the first linear member is located proximal to the fixing portion of the outer cylindrical member and at least a portion of the non-fixed portion distal to the midpoint in the longitudinal direction of the non-fixed portion is fixed to the non-fixed portion of the outer cylindrical member or the first cylindrical member, and the distal end of the second linear member is fixed to at least the fixing portion of the outer cylindrical member. [5] The catheter according to any one of [1] to [4], wherein the distal end of the second linear member is fixed to the proximal end of the second cylindrical member. [6] The catheter according to any one of [1] to [5], wherein the distal end of the first linear member is located proximal to the fixed portion of the outer cylindrical member and distal to the midpoint in the longitudinal direction of the non-fixed portion. [7] The catheter according to any one of [1] to [6], wherein, in a field of view where the central axis of the first cylindrical member and the central axis of the second cylindrical member do not overlap, the intersection of the second linear member is located proximal to the fixed portion of the outer cylindrical member and distal to the midpoint in the longitudinal direction of the non-fixed portion. [8] The catheter according to any one of [4] to [7], wherein, in a cross-section in the radial direction including the portion to which the first linear member is fixed, the center of the first linear member, the center of the outer cylindrical member, and the center of the second linear member are not located on the same straight line. [9] The catheter according to any one of [1] to [8], wherein the outer cylindrical member has a first portion of the outer cylindrical member that is on the side of the outer cylindrical member that is closer to the second cylindrical member in the radial direction and on which the first linear member and the second linear member are arranged.

[10] The catheter according to [9], wherein the first portion is at least a part of the region of the outer cylindrical member that is proximal to the fixed portion and distal to the midpoint in the longitudinal direction of the non-fixed portion.

[11] The catheter according to any one of [4] to

[10] , wherein in the radial cross-section of the portion to which the first linear member is fixed, the second linear member is closer to the second cylindrical member than the first linear member.

[12] The catheter according to any one of [4] to

[11] , wherein in the radial cross-section of the portion to which the first linear member is fixed, the outer diameter of the first linear member is smaller than the outer diameter of the second linear member.

[13] The catheter according to any one of [1] to

[12] , wherein the outer diameter of the non-fixed portion of the outer cylindrical member is larger than the outer diameter of the fixed portion of the outer cylindrical member.

[14] The catheter according to any one of [1] to

[13] , wherein the first linear member is a solid member without a lumen, and the second linear member is a solid member without a lumen.

[15] The catheter according to any one of [1] to

[14] , further comprising an outer member extending in the longitudinal direction and located distal to the outer cylindrical member, wherein the outer member has a portion that encloses a part of the first cylindrical member and at least a part of the second cylindrical member.

[16] The catheter according to

[15] , wherein the outer member is cylindrical and has a lumen extending in the longitudinal direction, and at least a part of the first cylindrical member and at least a part of the second cylindrical member are disposed in the lumen.

[17] The catheter according to

[15] , wherein the outer member extends in the longitudinal direction and has a column containing resin, and at least a part of the first cylindrical member and at least a part of the second cylindrical member are disposed within the column.

[18] The catheter according to any one of [1] to

[17] , wherein the first cylindrical member and the second cylindrical member are fixed to each other in the radial direction.

[19] The catheter according to any one of [1] to

[18] , wherein a handle portion is provided at the proximal end of the first cylindrical member.

[20] The catheter according to

[19] , wherein the proximal end of the first linear member is fixed to the proximal end of the first cylindrical member, the proximal end of the outer cylindrical member, or the handle portion, and the proximal end of the second linear member is fixed to the proximal end of the first cylindrical member, the proximal end of the outer cylindrical member, or the handle portion. 【0008】 According to this disclosure, the above configuration makes it possible to provide a catheter whose orientation within the body can be easily determined. 【0009】 Figure 1 is a side view of a catheter according to an embodiment. Figure 2 is a longitudinal cross-sectional view of region R1 in Figure 1. Figure 3 is a longitudinal cross-sectional view of region R2 in Figure 1. Figure 4 is a side view of the catheter as seen from the top to the bottom of Figure 1. Figure 5 is a front view of the catheter as seen from the distal to the proximal side of Figure 1. Figure 6 is a side view of the first and second linear members of the catheter in the first field of view of Figure 5. Figure 7 is a side view of the first and second linear members of the catheter in the second field of view of Figure 5. Figure 8 is a side view of the first and second linear members of the catheter in the third field of view of Figure 5. Figure 9 is a side view of the first and second linear members of the catheter in the fourth field of view of Figure 4. Figure 10 is a cross-sectional view of the catheter of Figure 1 taken along line X-X. Figure 11 is a cross-sectional view of a modified example of the catheter of Figure 1 taken along line X-X. Figure 12 is a cross-sectional view of the catheter of Figure 1 taken along line XII-XII. Figure 13 is a cross-sectional view of the catheter in Figure 1 along line XIII-XIII. Figure 14 is a cross-sectional view of a modified version of the catheter in Figure 1 along line XIII-XIII. Figure 15 is a side view of a modified version of the catheter in Figure 1. Figure 16 is a side view of a modified version of the catheter in Figure 1. 【0010】The following describes the contents of this disclosure in more detail based on the embodiments described below. However, the contents of this disclosure are not limited by the embodiments described below, and it is certainly possible to implement the disclosure with appropriate modifications within the scope that is consistent with the spirit of the preceding and following descriptions, and all such modifications are included within the technical scope of this disclosure. In addition, in some cases, component reference numerals, etc., may be omitted in the drawings for convenience, in which case refer to the specification or other drawings. Furthermore, the dimensions of various components in the drawings may differ from the actual dimensions, as priority is given to helping to understand the features of this disclosure. 【0011】 The catheter according to this embodiment includes a first tubular member extending in the longitudinal direction, a second tubular member extending in the longitudinal direction and radially adjacent to the first tubular member, an outer tubular member extending in the longitudinal direction and having a fixed portion that encloses a part of the first tubular member and is fixed to the first tubular member, and an unfixed portion located proximal to the fixed portion and not fixed to the first tubular member, a first linear member extending in the longitudinal direction and at least a part of which is located inside the outer tubular member, and a third tubular member extending in the longitudinal direction and at least a part of which is located inside the outer tubular member. A catheter comprising a first linear member and a second linear member, the distal end of which is located distal to the distal end of the first linear member, wherein the distal end of the first cylindrical member is located proximal to the distal end of the second cylindrical member, and the proximal end of the first cylindrical member is located proximal to the proximal end of the second cylindrical member, and in a side view of the catheter, in a field of view where the central axis of the first cylindrical member and the central axis of the second cylindrical member do not overlap, the second linear member has an intersection point that intersects the first linear member proximal to the fixing portion of the outer cylindrical member. As will be described later, for example, under X-ray fluoroscopy, by using information about the intersection point where the first linear member and the second linear member intersect, it becomes easier to grasp the orientation of the catheter inside the body. 【0012】The following describes a catheter according to an embodiment, with reference to Figures 1 to 16. Figure 1 is a side view of the catheter according to the embodiment. Figure 2 is a longitudinal cross-sectional view of region R1 in Figure 1. Figure 3 is a longitudinal cross-sectional view of region R2 in Figure 1. Figure 4 is a side view of the catheter as seen from the top to the bottom of Figure 1. Figure 5 is a front view of the catheter as seen from the distal to the proximal side of Figure 1. Figure 6 is a side view of the first and second linear members of the catheter in the first field of view of Figure 5. Figure 7 is a side view of the first and second linear members of the catheter in the second field of view of Figure 5. Figure 8 is a side view of the first and second linear members of the catheter in the third field of view of Figure 5. Figure 9 is a side view of the first and second linear members of the catheter in the fourth field of view of Figure 4. Figure 10 is a cross-sectional view of the catheter in Figure 1 taken along line X-X. Figure 11 is a cross-sectional view of a modified example of the catheter in Figure 1 taken along line X-X. Figure 12 is a cross-sectional view of the catheter in Figure 1 along line XII-XII. Figure 13 is a cross-sectional view of the catheter in Figure 1 along line XIII-XIII. Figure 14 is a cross-sectional view of a modified version of the catheter in Figure 1 along line XIII-XIII. Figure 15 is a side view of a modified version of the catheter in Figure 1. Figure 16 is a side view of a modified version of the catheter in Figure 1. 【0013】 As shown in Figures 1, 2, and 3, the catheter according to the embodiment is a catheter 91 having a first tubular member 1 extending in the longitudinal direction X and a second tubular member 2 extending in the longitudinal direction X and adjacent to the first tubular member 1 in the radial direction Y. The first tubular member 1 preferably has a lumen 1L extending in the longitudinal direction X. The second tubular member 2 preferably has a lumen 2L extending in the longitudinal direction X. By inserting, for example, a guidewire into the lumen 1L, the lumen 2L, or both, the catheter 91 can be guided in multiple directions via the guidewire, making it easier to insert the catheter 91 into various bifurcations or main trunks of coronary arteries, for example. Furthermore, by inserting a search wire, for example, a tip-bent wire, into the lumen 1L, the lumen 2L, or both, it is possible to search for stenotic areas, which are lesions of coronary arteries, for example. Of these, it is preferable to insert the search wire into the lumen 1L. 【0014】 The first cylindrical member 1 and the second cylindrical member 2 each preferably have one or more layers extending in the longitudinal direction X, and more preferably have multiple layers. The multiple layers preferably have an inner layer and an outer layer that encloses at least a portion of the inner layer. The multiple layers may further have an intermediate layer located between the inner layer and the outer layer. The number of intermediate layers is not limited to one, but may be two or more. It is preferable that each of the multiple layers contains a different material from the adjacent layers. The inner layer of the first cylindrical member 1 and the inner layer of the second cylindrical member 2 each preferably contain at least one resin selected from the group consisting of polyolefin resins and fluororesins. This improves the sliding properties of the guide wire inserted into the first lumen 1L and the second lumen 2L. The polyolefin resin is preferably polyethylene, polypropylene, ethylene-propylene copolymer, or a mixture thereof. The polyethylene is preferably high-density polyethylene with a specific gravity of 0.942 or higher. The fluororesin is preferably polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-ethylene copolymer, polyvinylidene fluoride, polychlorotrifluoroethylene, ethylene-chlorotrifluoroethylene copolymer, or a mixture thereof. The inner layer of the first cylindrical member 1 and the inner layer of the second cylindrical member 2 may each contain at least one selected from the group consisting of polyamide resin, polyester resin, polyurethane resin, polyolefin resin, fluororesin, vinyl chloride resin, silicone resin, and natural rubber. The inner layer of the first cylindrical member 1 and the inner layer of the second cylindrical member 2 may contain different resins, but it is preferable that they contain the same resin, and more preferably that they are made of the same resin. 【0015】The outer layer of the first cylindrical member 1 and the outer layer of the second cylindrical member 2 preferably each contain a flexible resin. The inclusion of a flexible resin in the outer layer makes the catheter 91 more flexible. The flexible resin preferably contains at least one selected from the group consisting of polyethylene, polyurethane, polyurethane-based thermoplastic elastomer, styrene-based thermoplastic elastomer, polyamide elastomer, and polyamide, and more preferably at least one selected from the group consisting of polyurethane and polyamide elastomer. The polyethylene is preferably low-density polyethylene with a specific gravity of 0.91 to 0.92. The Shore D hardness of the outer layer material is preferably less than or the same as the Shore D hardness of the inner layer material, and more preferably less. This makes the catheter 91 more flexible. The Shore D hardness can be measured, for example, with a durometer type D in accordance with ISO 7619. The intermediate layer preferably contains a different material from the inner or outer layer, but may contain the same material as the inner or outer layer. 【0016】 The inner layer, intermediate layer, and outer layer are preferably fixed to the adjacent layer. This makes it difficult for each layer to twist or warp. Examples of fixing methods include welding and bonding. Although not shown in the figures, a reinforcing member may be placed as the intermediate layer. Examples of reinforcing members include a braided body made of braided wire, a coil made of wire wound in a spiral shape, or a combination thereof. 【0017】 As shown in Figure 2, it is preferable that the first cylindrical member 1 has a first opening 1E that communicates with the lumen 1L. The first opening 1E can be used as the inlet or outlet for the wire. As shown in Figure 2, it is preferable that the second cylindrical member 2 has a second opening 2E that communicates with the lumen 2L. The second opening 2E can be used as the inlet or outlet for the wire. 【0018】 As shown in Figure 2, the distal end 1B of the first cylindrical member 1 is located proximal to the distal end 2B of the second cylindrical member 2. As a result, the catheter 91 is more likely to bend in the portion distal to the distal end 1B of the first cylindrical member 1. 【0019】As shown in Figures 1 and 3, the proximal end 1A of the first cylindrical member 1 is located proximal to the proximal end 2A of the second cylindrical member 2. This allows the portion of the catheter 91 proximal to the proximal end 2A of the second cylindrical member 2 to have a structure different from that of the first cylindrical member 1 and the second cylindrical member 2 which overlap radially in the Y direction, for example, by having a double-tube structure (coaxial structure), and thus enabling it to perform different functions. 【0020】 As shown in Figures 1 and 3, the catheter 91 further has an outer cylindrical member 3 extending in the longitudinal direction X. The outer cylindrical member 3 encloses a part of the first cylindrical member 1. Specifically, it is preferable that the outer cylindrical member 3 has a lumen 3L extending in the longitudinal direction X, and that a part of the first cylindrical member 1 is positioned in the lumen 3L. The outer cylindrical member 3 protects the first cylindrical member 1 while improving the transmission of the pushing force. The outer cylindrical member 3 and the first cylindrical member 1 can form a double-tube structure (coaxial structure), thereby reducing the risk of the catheter 91 puncturing the lumen 1L of the first cylindrical member 1 when inserting a wire. 【0021】As shown in Figures 1 and 3, the outer cylindrical member 3 has a fixed portion 3F that is fixed to the first cylindrical member 1 and an unfixed portion 3G that is located proximal to the fixed portion 3F and is not fixed to the first cylindrical member 1. The fixed portion 3F prevents the outer cylindrical member 3 from detaching while improving the transmission of the pushing force. Examples of fixing methods include welding and bonding. On the other hand, the unfixed portion 3G is the part of the outer cylindrical member 3 that is not fixed to the first cylindrical member 1 over its entire circumference in the circumferential direction, as shown in Figure 10, for example. The unfixed portion 3G makes it easier for the first cylindrical member 1 to move, thus making it easier to release the force associated with inserting a guide wire or the like into the first cylindrical member 1. For this reason, it is preferable that the unfixed portion 3G is longer than the fixed portion 3F in the longitudinal direction X. This reduces the risk of the wire piercing the first cylindrical member 1. In the longitudinal direction X, the length of the non-fixed portion 3G is preferably 50 to 200 times the length of the fixed portion 3F, and more preferably 100 to 150 times. The length of the fixed portion 3F in the longitudinal direction X is preferably 1 mm to 10 mm. Furthermore, it is preferable that the outer cylindrical member 3 has another fixed portion fixed to the handle portion 8 at its proximal end. 【0022】 The outer cylindrical member 3 is preferably located proximal to the proximal end 2A of the second cylindrical member 2. Specifically, the distal end of the outer cylindrical member 3 is preferably located proximal to the proximal end 2A of the second cylindrical member 2. This allows for a reduction in the outer diameter of the outer cylindrical member 3. 【0023】 The outer cylindrical member 3 preferably contains at least one material selected from the group consisting of polyethylene, polyurethane, polyurethane-based thermoplastic elastomer, styrene-based thermoplastic elastomer, polyamide elastomer, and polyamide. Of these, at least one material selected from the group consisting of polyurethane and polyamide elastomer is more preferable. This can improve flexibility. 【0024】As shown in Figure 1, the catheter 91 further has a first linear member 11 that extends in the longitudinal direction X and at least a portion of which is located inside the outer cylindrical member 3. The catheter 91 further has a second linear member 12 that extends in the longitudinal direction X and at least a portion of which is located inside the outer cylindrical member 3, with its distal end 12B located distal to the distal end 11B of the first linear member 11. Pushability can be improved by having such a first linear member 11 and second linear member 12. 【0025】 Figure 1 is a side view of the catheter 91, an example of a field of view in which the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 do not overlap. In such a field of view, the second linear member 12 has an intersection 12R (hereinafter sometimes referred to as "intersection 12R") that intersects with the first linear member 11 proximal to the fixing portion 3F of the outer cylindrical member 3. By using information about such an intersection 12R, for example as shown below, it becomes easier to grasp the orientation of the catheter 91. In Figures 2 and 3, the central axis of the first cylindrical member 1 is indicated by the symbol 1C, and the central axis of the second cylindrical member 2 is indicated by the symbol 2C. Refer to these drawings for each central axis. Hereinafter, a side view of the catheter 91 in which the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 do not overlap may be referred to as a "non-overlapping side view of the catheter 91". 【0026】Figures 6 and 7 are side views of the first linear member 11 and the second linear member 12 as seen from the first direction A and the second direction B, respectively, in Figure 5. As can be seen by comparing Figures 6 and 7, the position of the intersection 12R moves when the observation angle in the circumferential direction of the catheter 91 is changed. Therefore, for example, by knowing in advance the relationship between the observation angle in the circumferential direction and the length from the distal end 11B of the first linear member 11 to the intersection 12R, the circumferential orientation of the catheter 91 inside the body can be determined under X-ray fluoroscopy. The length from the distal end 11B of the first linear member 11 to the intersection 12R is shorter than the length from the distal end 12B of the second linear member 12 to the intersection 12R, making it easier to measure the length. Similarly, by knowing in advance the relationship between the observation angle in the circumferential direction and the angle between the first linear member 11 and the second linear member 12 at the intersection 12R, the circumferential orientation of the catheter 91 inside the body can be determined under X-ray fluoroscopy. 【0027】 Figure 4 is a side view of the catheter 91, showing an example of a field of view where the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 overlap. In such a field of view, it is preferable that the second linear member 12 does not have an intersection point where it intersects the first linear member 11 proximal to the fixing portion 3F of the outer cylindrical member 3. This allows us to see, for example, in observation under X-ray fluoroscopy, if the first linear member 11 and the second linear member 12 do not intersect as shown in Figure 8, it is clear that the catheter 91 is being observed from a direction in which the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 overlap within the body. On the other hand, although not shown, the second linear member 12 may have an intersection point where it intersects the first linear member 11 proximal to the fixing portion 3F of the outer cylindrical member 3 in the same field of view. Figure 8 is a diagram illustrating the first linear member 11 and the second linear member 12 of Figure 4, and also corresponds to the side view of the first linear member 11 and the second linear member 12 as seen from the third direction C in Figure 5. The angle between the first direction A and the third direction C is 90 degrees. 【0028】Figure 6 above corresponds to a side view of the first linear member 11 and the second linear member 12 as seen from the first direction A in Figure 4, and Figure 9 is a side view of the first linear member 11 and the second linear member 12 of the catheter 91 in the field of view of the fourth direction D in Figure 4. As can be seen by comparing Figure 6 and Figure 9, the position of the intersection 12R moves when the observation angle with respect to the axial direction of the catheter 91 is changed. Therefore, for example, by knowing in advance the relationship between the observation angle with respect to the axial direction and the length from the distal end 12B of the second linear member 12 to the intersection 12R, it is possible to determine the orientation of the catheter 91 in the body in the axial direction under X-ray fluoroscopy. The length from the distal end 12B of the second linear member 12 to the intersection 12R changes significantly in response to changes in the observation angle with respect to the axial direction of the catheter 91, so knowing this length makes it easier to determine the orientation of the catheter 91 in the axial direction. 【0029】 Alternatively, the relationship between the change in observation angle (degrees) and the movement of the intersection 12R (mm) can be determined in advance. For example, when observing a catheter 91 inside the body under X-ray fluoroscopy, the orientation of the catheter 91 can be determined by measuring the movement of the intersection 12R (mm) when the observation angle is changed by a predetermined amount (degrees). 【0030】 As described above, by determining the circumferential orientation, axial orientation, or both of these orientations of the catheter 91 within the body, it is possible to estimate the orientation of the first opening 1E and the second opening 2E, for example, and then expose a wire or the like from the first opening 1E or the second opening 2E. This improves the operability and safety of the catheter 91. 【0031】As shown in Figure 1, in a side view of the catheter 91, in a field of view where the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 do not overlap, i.e., in a non-overlapping side view of the catheter 91, it is sufficient that the first linear member 11 and the second linear member 12 intersect at the intersection 12R, and it is not necessary for the first linear member 11 and the second linear member 12 to be in contact. Furthermore, if there are multiple non-overlapping side views of the catheter 91, it is preferable that, among the non-overlapping side views of the catheter 91, in the field of view where the distance between the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 is greatest, the second linear member 12 has an intersection 12R where it intersects with the first linear member 11. If the central axes of the first cylindrical member 1 and the central axes of the second cylindrical member 2 have portions that are not parallel to each other, the field of view where this distance is greatest is the field of view where the shortest distance between the central axes of the first cylindrical member 1 and the central axes of the second cylindrical member 2 is greatest. Furthermore, by configuring each linear member such that, in a non-overlapping side view of the catheter 91, the second linear member 12 has only one intersection 12R intersecting with the first linear member 11, the shape of each linear member can be simplified. On the other hand, in a non-overlapping side view of the catheter 91, the second linear member 12 may have two or more intersection 12Rs. In this case, the number of intersection 12Rs may change when the observation angle in the circumferential direction of the catheter 91 is changed. For example, by knowing in advance the relationship between the observation angle in the circumferential direction and the number of intersection 12Rs, the circumferential orientation of the catheter 91 inside the body can be determined under X-ray fluoroscopy. Such two or more intersection 12Rs are more easily formed when the first linear member 11 and the second linear member 12 have a total of two or more curved sections. In this case, the first linear member 11 may have two or more curved portions, the second linear member 12 may have two or more curved portions, or the first linear member 11 may have one curved portion and the second linear member 12 may have one curved portion. 【0032】As shown in Figure 1, in a non-overlapping side view of the catheter 91, the angle between the first linear member 11 and the second linear member 12 at the intersection 12R is preferably 5 degrees or more, more preferably 10 degrees or more. This makes it easier to distinguish the intersection 12R, for example, under X-ray fluoroscopy. On the other hand, this angle is preferably 60 degrees or less, more preferably 45 degrees or less. This improves the pushability of the first linear member 11 and the second linear member 12. 【0033】 As shown in Figure 1, in a non-overlapping side view of the catheter 91, it is preferable that the first linear member 11 has at least one linear portion 11V. In a non-overlapping side view of the catheter 91, it is preferable that the second linear member 12 has at least one linear portion 12V. This makes it possible to further improve the pushing force. 【0034】 As shown in Figure 1, in a non-overlapping side view of the catheter 91, it is preferable that the second linear member 12 has a curved portion 12W. This facilitates the formation of the intersection portion 12R. On the other hand, as shown in Figure 1, the first linear member 11 may consist of a straight portion 11V, but as shown in Figures 15 and 16, in a non-overlapping side view of the catheter 91, the first linear member 11 may have a curved portion 11W. This facilitates the formation of the intersection portion 12R. On the other hand, as shown in Figure 15, the second linear member 12 may consist of a straight portion 12V. 【0035】 As shown in Figure 1, in a non-overlapping side view of the catheter 91, if the second linear member 12 has a plurality of straight sections 12V, it is preferable that the most distal straight section 12V of the second linear member 12 includes the distal end 12B of the second linear member 12. In a non-overlapping side view of the catheter 91, it is preferable that the curved section 12W of the second linear member 12 is adjacent to the proximal side of the most distal straight section 12V. 【0036】As shown in Figure 15, in a non-overlapping side view of the catheter 91, if the first linear member 11 has a plurality of straight sections 11V, it is preferable that the most distal straight section 11V of the first linear member 11 includes the distal end 11B of the first linear member 11. In a non-overlapping side view of the catheter 91, it is preferable that the curved section 11W of the first linear member 11 is adjacent to the proximal side of the most distal straight section 11V. 【0037】 Figure 4 shows a side view of the catheter 91, illustrating that in the field of view where the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 overlap, the first linear member 11 consists of a straight portion and the second linear member 12 also consists of a straight portion. However, the first linear member 11, the second linear member 12, or both of them may have curved portions. 【0038】 The first linear member 11 and the second linear member 12 preferably contain a metal, and more preferably are made of a metal. The metal is preferably stainless steel, nickel, titanium, cobalt-chromium, or an alloy thereof. This can further improve the pressing force. Furthermore, the first linear member 11 and the second linear member 12 preferably contain an X-ray opaque material. Examples of X-ray opaque materials include the materials exemplified as X-ray opaque materials in the X-ray opaque marker described later. 【0039】As shown in Figures 1, 3, 10, and 11, it is preferable that the first linear member 11 is fixed to the non-fixed portion 3G of the outer cylindrical member 3 or the first cylindrical member 1 at least a portion of it that is proximal to the fixed portion 3F of the outer cylindrical member 3 and distal to the midpoint 3M (hereinafter sometimes referred to as "midpoint 3M") in the longitudinal direction X of the non-fixed portion 3G. By arranging the portion 11F to which the first linear member 11 is fixed in this manner, the transmission of the pressing force in the portion of the outer cylindrical member 3 proximal to the fixed portion 3F can be improved. It is preferable that at least the distal portion of the first linear member 11 is located inside the outer cylindrical member 3, and it is more preferable that both the distal and proximal portions are located inside the outer cylindrical member 3. This improves the transmission of the pressing force from inside the outer cylindrical member 3. It is preferable that at least the distal end of the first linear member 11 is fixed to the non-fixed portion 3G of the outer cylindrical member 3 or the first cylindrical member 1. This improves the transmission of the pressing force by the first linear member 11. 【0040】 As shown in Figure 10, the first linear member 11 is fixed to the non-fixed portion 3G of the outer cylindrical member 3 at least a portion distal to the midpoint 3M, thereby improving the transmission of the pressing force via the outer cylindrical member 3. On the other hand, as shown in Figure 11, the first linear member 11 is fixed to the first cylindrical member 1 at least a portion distal to the midpoint 3M, thereby improving the transmission of the pressing force via the first cylindrical member 1. The first linear member 11 may have a portion fixed to the non-fixed portion 3G of the outer cylindrical member 3 and a portion fixed to the first cylindrical member 1, or it may have only one of these portions. 【0041】As shown in Figure 1, it is preferable that the first linear member 11 is fixed to the non-fixed portion 3G of the outer cylindrical member 3 or the first cylindrical member 1 in a portion distal to the midpoint 3M. In Figure 1, reference numeral 11F indicates the portion to which the first linear member 11 is fixed. Having a fixed portion and an unfixed portion distal to the midpoint 3M in this way makes it easier to achieve both improved pressing force and improved curvature. On the other hand, the first linear member 11 may be fixed to the first cylindrical member 1 or the outer cylindrical member 3 in its entirety distal to the midpoint 3M. The first linear member 11 may be fixed to the first cylindrical member 1 or the outer cylindrical member 3 in part or all of its portion distal to the intersection 12R. 【0042】 As shown in Figure 1, it is preferable that the distal end 11B of the first linear member 11 is located proximal to the fixing portion 3F of the outer cylindrical member 3 and distal to the midpoint 3M. This makes the portion between the distal end 11B of the first linear member 11 and the distal end 12B of the second linear member 12 in the longitudinal direction X more prone to curvature, and improves the transmission of compressive force distal to the midpoint 3M. 【0043】 Although not shown in the diagram, the distal end of the first linear member 11 may be fixed distal to the fixing portion 3F of the outer cylindrical member 3, the proximal end 2a of the second cylindrical member 2, or both. This improves the transmission of the pushing force from the first linear member 11 to the second cylindrical member 2. In this case, it is preferable that the distal end of the second linear member 12 is fixed to the distal end of the first cylindrical member 1, the distal portion of the second cylindrical member 2, or both. 【0044】As shown in FIG. 1, in a side view of the catheter 91, in a field of view where the central axis of the first cylindrical member 1 and the central axis of the second cylindrical member 2 do not overlap, that is, in a non-overlapping side view of the catheter 91, the intersection portion 12R of the second linear member 12 is preferably located on the proximal side of the fixing portion 3F of the outer cylindrical member 3 and on the distal side of the midpoint 3M. By being located on the distal side of the midpoint 3M, it becomes easier to estimate the orientations of, for example, the first opening 1E and the second opening 2E based on information regarding the intersection portion 12R. On the other hand, the intersection portion 12R may be located on the proximal side of the midpoint 3M. 【0045】 As shown in FIGS. 3 and 12, the distal end portion 12b of the second linear member 12 is preferably fixed to at least the fixing portion 3F of the outer cylindrical member 3. By fixing the distal end portion 12b of the second linear member 12 in this manner, the transmission of the pushing force in the portion on the distal side from the fixing portion 3F of the outer cylindrical member 3 can be improved. Reference numeral 12F in FIG. 1 indicates the portion where the second linear member 12 is fixed. Although not shown, all of the second linear member 12 may be disposed within the outer cylindrical member 3. 【0046】 As shown in FIGS. 3 and 13, the distal end portion 12b of the second linear member 12 is preferably further fixed to the proximal end portion 2a of the second cylindrical member 2. By fixing the distal end portion 12b of the second linear member 12 in this manner to at least the fixing portion 3F of the outer cylindrical member 3 and the proximal end portion 2a of the second cylindrical member 2, the transmission of the pushing force from the second linear member 12 to the second cylindrical member 2 can be improved. 【0047】 As shown in FIGS. 3 and 13, the distal end portion 12b of the second linear member 12 is preferably further fixed to the proximal end portion 2a of the first cylindrical member 1 and the second cylindrical member 2. By positioning the distal end portion 12b of the second linear member 12 between the first cylindrical member 1 and the second cylindrical member 2 in this manner, it becomes difficult for the second linear member 12 to be exposed outside the catheter 91, and the transmission of the pushing force to the first cylindrical member 1 and the second cylindrical member 2 can be improved. 【0048】As shown in FIGS. 10 and 11, in a cross-section in the radial direction Y (hereinafter sometimes referred to as "cross-section Y") including the portion 11F where the first linear member 11 is fixed, it is preferable that the center 11N of the first linear member 11, the center 3N of the outer cylindrical member 3, and the center 12N of the second linear member 12 are not located on the same straight line. Thereby, the intersection portion 12R is easily formed. 【0049】 As shown in FIGS. 1, 3, 10, and 11, it is preferable that the outer cylindrical member 3 has a first portion 3P1 on the side 3R2 closer to the second cylindrical member 2 in the radial direction Y of the outer cylindrical member 3, where the first linear member 11 and the second linear member 12 are arranged. By arranging at least a part of each of the first linear member 11 and the second linear member 12 on the side 3R2 closer to the second cylindrical member 2 of the outer cylindrical member 3, the intersection portion 12R is easily formed on the side 3R2 closer to the second cylindrical member 2 of the outer cylindrical member 3. 【0050】 As shown in FIG. 1, it is preferable that the first portion 3P1 is at least a part of a region on the proximal side of the fixing portion 3F of the outer cylindrical member 3 and on the distal side of the midpoint 3M in the longitudinal direction X of the non-fixing portion 3G. When the first portion 3P1 is located on the proximal side of the fixing portion 3F, the fixing portion 3F and its vicinity are likely to be curved. When the first portion 3P1 is located on the distal side of the midpoint 3M, the intersection portion 12R is easily formed in the region on the distal side of the midpoint 3M. 【0051】As shown in Figure 1, it is preferable that the outer cylindrical member 3 has a second portion 3P2, which is the portion of the outer cylindrical member 3 where the first linear member 11 or the second linear member 12 is located on the side 3R2 closer to the second cylindrical member 2 in the radial direction Y, and the second linear member 12 or the first linear member 11 is located on the side 3R1 further from the second cylindrical member 2. In Figure 1, the first linear member 11 is located on the side 3R2 closer to the second cylindrical member 2 in the radial direction Y, and the second linear member 12 is located on the side 3R1 further from the second cylindrical member 2. This makes it easier to push even if the operator changes how they hold the handle portion 8. As shown in Figure 1, the second portion 3P2 may be adjacent to the proximal side of the first portion 3P1 in the longitudinal direction X and may extend to the proximal end of the outer cylindrical member 3. 【0052】 As shown in Figure 1, the first portion 3P1 may extend from the side proximal to the midpoint 3M of the outer cylindrical member 3 to the side distal to the midpoint 3M. This further improves the transmission of the compressive force. 【0053】 As shown in Figures 10 and 11, in the cross-section (cross-section Y) in the radial direction Y including the portion 11F to which the first linear member 11 is fixed, it is preferable that the second linear member 12 is closer to the second cylindrical member 2 than the first linear member 11. In Figures 10 and 11, the upper side is the side closer to the second cylindrical member 2. By positioning the second linear member 12 closer to the second cylindrical member 2 than the first linear member 11, the transmission of the pushing force from the second linear member 12 to the second cylindrical member 2 can be improved. 【0054】 The outer diameter of the non-fixed portion 3G of the outer cylindrical member 3 is preferably larger than the outer diameter of the fixed portion 3F of the outer cylindrical member 3. This makes it less likely for the wire to penetrate the first cylindrical member 1 and the non-fixed portion 3G of the outer cylindrical member 3 when inserting the wire into the lumen 1L. The outer diameter of the non-fixed portion refers to the diameter of the circle if the cross-sectional shape of the non-fixed portion in the radial direction Y is a circle, or the diameter of the circumscribed circle of the non-fixed portion if the cross-sectional shape is other. The outer diameter of the fixed portion refers to the diameter of the circle if the cross-sectional shape of the fixed portion in the radial direction Y is a circle, or the diameter of the circumscribed circle of the fixed portion if the cross-sectional shape is other. 【0055】 As shown in Figures 10 and 11, in the radial cross-section (cross-section Y) of the portion 11F to which the first linear member 11 is fixed, it is preferable that the outer diameter of the first linear member 11 is smaller than the outer diameter of the second linear member 12. This makes the portion to which the first linear member 11 is fixed more flexible and improves the transmission of the pushing force from the second linear member 12 to the first cylindrical member 1 and the second cylindrical member 2. The outer diameter of the linear member refers to the diameter of the circle if the cross-sectional shape of the linear member in the radial Y direction is a circle, and to the diameter of the circumscribed circle of the linear member if the cross-sectional shape is other. 【0056】 The first linear member 11 and the second linear member 12 preferably have a circular, elliptical, polygonal, or rounded polygonal cross-sectional shape in the radial direction Y, and more preferably a circular shape. This reduces the anisotropy of the bending strength. The first linear member 11 is preferably a solid member without a lumen, and the second linear member 12 is preferably a solid member without a lumen. This improves the transmission of the pushing force. The catheter 91 preferably has two linear members, but it may have three or more, or five or fewer. 【0057】 As shown in Figure 3, it is preferable that the second linear member 12 has a constant diameter portion 12U that extends in the longitudinal direction X and has a constant radial length. It is even more preferable that the second linear member 12 has a tapered portion 12T located distal to the constant diameter portion 12U and tapering toward the distal end. The constant diameter portion 12U improves the pressing force, and the tapered portion 12T makes the second linear member 12 easier to bend. It is preferable that the tapered portion 12T is located at least within the fixing portion 3F of the outer cylindrical member 3. 【0058】Although not shown in the figures, it is preferable that the first linear member 11 has a constant diameter portion that extends in the longitudinal direction X and has a constant radial length. It is even more preferable that the first linear member 11 has a tapered portion located distal to the constant diameter portion and tapering toward the distal end. The constant diameter portion improves the pressing force, and the tapered portion makes the first linear member 11 easier to bend. It is preferable that the tapered portion 12T of the second linear member 12 is located distal to the tapered portion of the first linear member 11. This makes it easier to bend smoothly from the distal end to the proximal end. 【0059】 As shown in Figure 1, it is preferable that the proximal end 11a of the first linear member 11 is fixed to the proximal end 1a of the first cylindrical member 1, the proximal end 3a of the outer cylindrical member 3, or the handle portion 8. It is also preferable that the proximal end 12a of the second linear member 12 is fixed to the proximal end 1a of the first cylindrical member 1, the proximal end 3a of the outer cylindrical member 3, or the handle portion 8. This improves the transmission of the pushing force. Examples of these fixing methods include welding and bonding. Furthermore, the first linear member 11 and the second linear member 12 may each be fixed to the first cylindrical member 1 or the outer cylindrical member 3 in part or all of the portion proximal to the fixing portion 3F of the outer cylindrical member 3. 【0060】 It is preferable that the proximal ends of the first linear member 11 and the second linear member 12 are located within the handle portion 8. This makes it easier to transmit the pushing force from the handle portion 8 to the first linear member 11 and the second linear member 12. 【0061】 As shown in Figures 1, 2, and 3, it is preferable that the catheter 91 further has an outer member 4 that extends in the longitudinal direction X and is located distal to the outer cylindrical member 3. It is preferable that the outer member 4 has a portion that encloses a part of the first cylindrical member 1 and at least a part of the second cylindrical member 2. The outer member 4 can protect the first cylindrical member 1 and the second cylindrical member 2, and can also make it easier to prevent the wire from piercing through from inside the catheter 91. 【0062】The outer member 4 preferably contains at least one material selected from the group consisting of polyethylene, polyurethane, polyurethane-based thermoplastic elastomer, styrene-based thermoplastic elastomer, polyamide elastomer, and polyamide. Of these, at least one material selected from the group consisting of polyurethane and polyamide elastomer is more preferred. The outer cylindrical member 3 preferably contains the same resin as the outer member 4 or a harder resin, and more preferably is made of a harder resin. A harder resin can improve pushability. Furthermore, it is preferable that the distal end of the outer cylindrical member 3 and the proximal end of the outer member 4 are fixed to each other. 【0063】 As shown in Figure 13, the outer member 4 preferably has a columnar body 5 containing resin that extends in the longitudinal direction X, and at least a portion of the first cylindrical member 1 and at least a portion of the second cylindrical member 2 are arranged within the columnar body 5. That is, it is preferable that at least a portion of the first cylindrical member 1 and the second cylindrical member 2 are sealed by the columnar body 5 containing resin that extends in the longitudinal direction X. This makes it easier to maintain the shape of the first lumen 1L and the second lumen 2L that extend in the longitudinal direction X even if the catheter 91 is curved. It is preferable that the columnar body 5 is arranged at least between the proximal end 2A and the distal end 2B of the second cylindrical member 2. The resin of the columnar body 5 may be present between the first cylindrical member 1 and the second cylindrical member 2. 【0064】 The shape of the column 5 is preferably cylindrical, elliptical, or rounded polygonal column, and more preferably cylindrical or elliptical. This makes it easier to insert the catheter 91 into the body. 【0065】 The columnar body 5 may be formed by covering a resin tube with a first cylindrical member 1 and a second cylindrical member 2 that are superimposed in the radial direction Y, heating them, and welding them together, or the columnar body 5 may be formed by injection molding the first cylindrical member 1 and the second cylindrical member 2 that are superimposed in the radial direction Y. 【0066】As shown in Figure 2, it is preferable that the distal end 4B of the outer member 4 is located distal to the distal end 2B of the second cylindrical member 2. By arranging the outer member 4, which is made of a flexible material, in this manner, the flexibility of the portion of the catheter 91 distal to the distal end 2B of the second cylindrical member 2 can be improved. 【0067】 Preferably, at least a portion of the inner surface of the outer member 4 is fixed to the outer surface of the second cylindrical member 2. Furthermore, it is even more preferable that at least a portion of the inner surface of the outer member 4 is fixed to the outer surface of the first cylindrical member 1. This makes it difficult for the outer member 4 to twist or bend. Examples of fixing methods include welding and bonding. 【0068】 The length in the longitudinal direction X from the distal end 4B of the outer member 4 to the distal end 2B of the second cylindrical member 2 is preferably greater than the maximum thickness of the second cylindrical member 2. This improves the flexibility of the catheter 91 near its distal end. 【0069】 As shown in Figure 14, the outer member 4 is cylindrical and has a lumen 4L extending in the longitudinal direction X, and at least a part of the first cylindrical member 1 and at least a part of the second cylindrical member 2 may be arranged in the lumen 4L. This protects the first cylindrical member 1 and the second cylindrical member 2, and the gaps between the outer member 4 and the first cylindrical member 1 and the gaps between the outer member 4 and the second cylindrical member 2 allow each cylindrical member to move to some extent, thereby releasing the force from the inside of the catheter 91 such as a guide wire, and as a result, it is easier to prevent the guide wire from puncturing the catheter. Preferably, the distal end of the cylindrical outer member 4 is fixed to the first cylindrical member 1 and the second cylindrical member 2. Furthermore, it is preferable that the proximal end of the cylindrical outer member 4 is fixed to the first cylindrical member 1 and the second cylindrical member 2. This makes the cylindrical outer member 4 less likely to twist or bend. 【0070】As shown in Figure 2, it is preferable that the outer member 4 has a raised portion 41 that is distal to the distal end 1B of the first cylindrical member 1 and on the side closer to the first cylindrical member 1 in the radial direction Y, and that rises in a direction away from the central axis 2C. This allows the tip of the wire inserted into the first cylindrical member 1 to be guided in a different direction from the tip of the wire inserted into the second cylindrical member 2, making it easier to treat lesions at the bifurcation. This also makes it less likely for the wires to become entangled. It is preferable that the raised portion 41 is adjacent to the distal end 1B of the first cylindrical member 1. This makes it easier to guide the wire coming out of the first opening 1E with the raised portion 41. On the other hand, although not shown, the outer member 4 does not have to have a raised portion that is distal to the distal end 1B of the first cylindrical member 1 and on the side closer to the first cylindrical member 1 in the radial direction Y, and that rises in a direction away from the central axis 2C. 【0071】 As shown in Figure 2, when the cross section X is defined as the longitudinal direction X including the central axis 1C of the first cylindrical member 1 and the central axis 2C of the second cylindrical member 2, it is preferable that the raised portion 41 has, in cross section X, a first inclined portion that slopes away from the central axis 2C as it approaches the distal end, and a second inclined portion that slopes closer to the central axis 2C as it approaches the distal end. It is preferable that the second inclined portion is located distal to the first inclined portion. The first inclined portion makes it easier to guide the wire coming out of the first opening 1E. The second inclined portion makes it easier to insert into the body. The shape of the outer surfaces of the first and second inclined portions in cross section X is preferably straight or curved, and more preferably straight. When the outer surface of the second inclined portion in cross section X is straight, the shape of the second inclined portion is a so-called tapered shape. 【0072】As shown in Figures 13 and 14, it is preferable that the first cylindrical member 1 and the second cylindrical member 2 are fixed to each other in the radial direction Y. Specifically, it is preferable that the outer surfaces of the first cylindrical member 1 and the second cylindrical member 2 are fixed to each other in the radial direction Y. This makes it difficult for the first cylindrical member 1 and the second cylindrical member 2 to twist or flex, thereby improving the transmission of compressive force. Furthermore, this makes it easier to hold the distal end 12b of the second linear member 12 between the first cylindrical member 1 and the second cylindrical member 2. Examples of fixing methods include welding and bonding. 【0073】 As shown in Figure 13, it is preferable that the first cylindrical member 1 and the second cylindrical member 2 are fixed to the outer member 4. Specifically, it is preferable that the outer surface of the first cylindrical member 1 and the outer surface of the second cylindrical member 2 are fixed to the inner surface of the outer member 4. This makes it difficult for the first cylindrical member 1 and the second cylindrical member 2 to twist or bend, thereby improving the transmission of compressive force. 【0074】 Although not shown in the diagram, the first cylindrical member 1 and the second cylindrical member 2 do not necessarily have to be fixed to each other in the radial direction Y. For example, as shown in Figure 14, if the outer member 4 is cylindrical, if the first cylindrical member 1 and the second cylindrical member 2 are not fixed to each other in the radial direction Y, it is possible to easily release the force associated with inserting a wire into the first cylindrical member 1 or the second cylindrical member 2. Also, the first cylindrical member 1 and the second cylindrical member 2 do not necessarily have to be fixed to the outer member 4. This makes it possible to easily release the force associated with inserting a wire into the first cylindrical member 1 or the second cylindrical member 2. 【0075】 The outer diameters of the first cylindrical member 1 and the second cylindrical member 2 are preferably 0.2 mm or more and 0.8 mm or less, and more preferably 0.3 mm or more and 0.7 mm or less, respectively. This makes it easier to insert the catheter 91 into the curved portion of the coronary artery. 【0076】As shown in Figure 1, it is preferable that a handle portion 8 is positioned at the proximal end 1a of the first cylindrical member 1. Specifically, it is preferable that the proximal end 1a of the first cylindrical member 1 is positioned inside the handle portion 8. The practitioner can insert the catheter 91 into the body by grasping and pressing the handle portion 8. The outer shape of the handle portion 8 should be such that it can be grasped by the practitioner's fingers. It is preferable that the handle portion 8 is a resin molded product obtained by injection molding or the like. Examples of resins include polyolefin resins such as polyethylene and polypropylene, polycarbonate resins, and (meth)acrylic resins. Among these resins, transparent resins such as polycarbonate and polymethyl methacrylate are preferred. This makes the inside of the handle portion 8 easier to see, making it easier to insert the wire. 【0077】 The proximal end 1A of the first cylindrical member 1 is preferably located within the handle portion 8. This improves the pushing force. 【0078】 The handle portion 8 preferably has a lumen that communicates with the lumen 1L of the first cylindrical member 1 and extends in the longitudinal direction X. A wire can be inserted through this lumen. 【0079】 As shown in Figure 2, the first cylindrical member 1 may have an X-ray opaque marker 6A located proximal to the proximal end of the first opening 1E and distal to a point 1 cm proximal to the proximal end of the first opening 1E. This makes it easier to determine the position of the first opening 1E. 【0080】 The second cylindrical member 2 may have an X-ray opaque marker 6B located distal to the distal end 1B of the first cylindrical member 1 and proximal to the distal end 2B of the second cylindrical member 2. This makes it easier to grasp the position of the curved portion of the catheter 91 when inserting it into a curved portion of the body, thus facilitating insertion. 【0081】The X-ray opaque marker is preferably ring-shaped. The X-ray opaque marker preferably contains an X-ray opaque material, and more preferably consists of an X-ray opaque material. The X-ray opaque material is preferably at least one selected from the group consisting of lead, barium, iodine, tungsten, gold, platinum, iridium, platinum-iridium alloy, stainless steel, titanium, cobalt-chromium alloy, palladium, and tantalum. 【0082】 By using the radiopaque markers such as the aforementioned radiopaque marker 6A and radiopaque marker 6B in combination with the intersection 12R, the orientation of the catheter 91 becomes even easier to determine. 【0083】 Although not shown in the figures, the catheter 91 may further have a tip extending in the longitudinal direction X. The tip preferably has a lumen extending in the longitudinal direction X, and at least the distal end of the second cylindrical member 2 is positioned within the lumen. This makes it easier for the tip and the second cylindrical member 2 to bend together as a single unit. 【0084】 Preferably, at least a portion of the inner surface of the tip is fixed to the outer surface of the second cylindrical member 2. This makes it easier for the tip and the second cylindrical member 2 to bend together as a single unit. Examples of fixing methods include welding and bonding. 【0085】 The chip preferably contains a flexible resin. The flexible resin preferably contains at least one selected from the group consisting of polyethylene, polyurethane, polyurethane-based thermoplastic elastomer, styrene-based thermoplastic elastomer, polyamide elastomer, and polyamide, and more preferably contains at least one selected from the group consisting of polyurethane and polyamide elastomer. The polyethylene is preferably low-density polyethylene with a specific gravity of 0.91 to 0.92. 【0086】 The catheter 91 can be preferably used in treatments to dilate narrowed or blocked areas of passages such as blood vessels in the body, and can be preferably used in coronary intervention (PCI) for lesions at the bifurcation of coronary arteries. 【0087】This application claims the benefit of priority based on Japanese Patent Application No. 2024-217223, filed on 12 December 2024. The entire specification of Japanese Patent Application No. 2024-217223 is incorporated herein by reference. 【0088】 1. First cylindrical member 1a Proximal end 1A Proximal end 1B Distal end 1C Central axis 1E First opening 1L Lumen 2. Second cylindrical member 2a Proximal end 2A Proximal end 2B Distal end 2C Central axis 2E Second opening 2L Lumen 3. Outer cylindrical member 3a Proximal end 3F Fixed part 3G Unfixed part 3L Lumen 3M Midpoint 3N Center 3P1 First part 3P2 Second part 3R1 Side farther from the second cylindrical member 3R2 Side closer to the second cylindrical member 4. Outer member 4L Lumen 5. Columnar body 6A, 6B Radiopaque marker 8. Handle part 11. First linear member 11a Proximal end 11B Distal end 11F Fixed part 11N Center 11V Straight section 11W Curved section 12 Second linear member 12a Proximal end 12b Distal end 12B Distal end 12F Fixed section 12N Center 12R Intersection 12T Tapered section 12U Diameter-constant section 12V Straight section 12W Curved section 41 Raised section 91 Catheter A, B, C, D First direction, second direction, third direction, fourth direction X Longitudinal direction Y Radial direction

Claims

1. A catheter comprising: a first tubular member extending in the longitudinal direction; a second tubular member extending in the longitudinal direction and radially adjacent to the first tubular member; an outer tubular member extending in the longitudinal direction, enclosing a part of the first tubular member, and having a fixed portion fixed to the first tubular member and an unfixed portion located proximal to the fixed portion and not fixed to the first tubular member; a first linear member extending in the longitudinal direction and at least a part of which is disposed within the outer tubular member; and a second linear member extending in the longitudinal direction and at least a part of which is disposed within the outer tubular member, with its distal end located distal to the distal end of the first linear member, wherein the distal end of the first tubular member is located proximal to the distal end of the second tubular member, and the proximal end of the first tubular member is located proximal to the proximal end of the second tubular member. A catheter in which, in a side view of the catheter, in a field of view where the central axis of the first cylindrical member and the central axis of the second cylindrical member do not overlap, the second linear member has an intersection portion that intersects the first linear member proximal to the fixing portion of the outer cylindrical member.

2. The catheter according to claim 1, in a side view of the catheter, in a field of view where the central axis of the first cylindrical member and the central axis of the second cylindrical member overlap, the second linear member does not have an intersection with the first linear member proximal to the fixing portion of the outer cylindrical member.

3. The catheter according to claim 1 or 2, wherein the outer cylindrical member is located more proximal to the proximal end of the second cylindrical member.

4. The catheter according to claim 1 or 2, wherein the first linear member is fixed to the non-fixed portion of the outer cylindrical member or the first cylindrical member at least a portion of the non-fixed portion that is proximal to the fixed portion of the outer cylindrical member and distal to the midpoint in the longitudinal direction of the non-fixed portion, and the distal end of the second linear member is fixed to at least the fixed portion of the outer cylindrical member.

5. The catheter according to claim 4, wherein the distal end of the second linear member is further fixed to the proximal end of the second cylindrical member.

6. The catheter according to claim 1 or 2, wherein the distal end of the first linear member is located proximal to the fixed portion of the outer cylindrical member and distal to the midpoint in the longitudinal direction of the non-fixed portion.

7. The catheter according to claim 1 or 2, wherein, in a field of view in which the central axis of the first cylindrical member and the central axis of the second cylindrical member do not overlap, the intersection of the second linear member is located proximal to the fixed portion of the outer cylindrical member and distal to the midpoint in the longitudinal direction of the non-fixed portion.

8. The catheter according to claim 4, wherein, in the radial cross-section including the portion to which the first linear member is fixed, the center of the first linear member, the center of the outer cylindrical member, and the center of the second linear member are not located on the same straight line.

9. The catheter according to claim 1 or 2, wherein the outer cylindrical member has a first portion of the outer cylindrical member that is on the side of the outer cylindrical member that is closer to the second cylindrical member in the radial direction and on which the first linear member and the second linear member are arranged.

10. The catheter according to claim 9, wherein the first portion is at least a part of the region of the outer cylindrical member that is proximal to the fixed portion and distal to the midpoint in the longitudinal direction of the non-fixed portion.

11. The catheter according to claim 4, wherein, in the radial cross-section of the portion to which the first linear member is fixed, the second linear member is closer to the second cylindrical member than the first linear member.

12. The catheter according to claim 4, wherein, in the radial cross-section of the portion to which the first linear member is fixed, the outer diameter of the first linear member is smaller than the outer diameter of the second linear member.

13. The catheter according to claim 1 or 2, wherein the outer diameter of the non-fixed portion of the outer cylindrical member is greater than the outer diameter of the fixed portion of the outer cylindrical member.

14. The catheter according to claim 1 or 2, wherein the first linear member is a solid member without a lumen, and the second linear member is a solid member without a lumen.

15. The catheter according to claim 1 or 2, further comprising an outer member extending in the longitudinal direction and located distal to the outer cylindrical member, wherein the outer member has a portion that encloses a part of the first cylindrical member and at least a part of the second cylindrical member.

16. The catheter according to claim 15, wherein the outer member is cylindrical and has a lumen extending in the longitudinal direction, and at least a portion of the first cylindrical member and at least a portion of the second cylindrical member are disposed in the lumen.

17. The catheter according to claim 15, wherein the outer member has a column extending in the longitudinal direction and containing resin, and at least a portion of the first cylindrical member and at least a portion of the second cylindrical member are disposed within the column.

18. The catheter according to claim 1 or 2, wherein the first cylindrical member and the second cylindrical member are fixed to each other in the radial direction.

19. The catheter according to claim 1 or 2, wherein a handle portion is provided at the proximal end of the first cylindrical member.

20. The catheter according to claim 19, wherein the proximal end of the first linear member is fixed to the proximal end of the first cylindrical member, the proximal end of the outer cylindrical member, or the handle portion, and the proximal end of the second linear member is fixed to the proximal end of the first cylindrical member, the proximal end of the outer cylindrical member, or the handle portion.

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