catheter

Abstract

This technology provides a way to reduce the labor required when switching between aspiration of intravascular deposits and injection of contrast agent. [Solution] The catheter comprises a first lumen extending along the longitudinal direction of the catheter and a second lumen extending along the longitudinal direction, wherein the tip of the first lumen is a first opening connected to the outside of the catheter, and the tip of the second lumen is a second opening that opens to the side of the catheter.

Description

Technical Field

[0001] The present disclosure relates to a catheter.

Background Art

[0002] As a medical instrument for aspirating and removing vascular deposits such as thrombi formed in blood vessels, an aspiration catheter is known. For example, Patent Document 1 discloses an aspiration catheter in which a plurality of aspiration ports are circumferentially arranged on the side wall of a lumen for thrombus aspiration. Patent Document 2 discloses an aspiration catheter having a cut surface with an inclined tip opening.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] After a doctor aspirates vascular deposits using the aspiration catheters of Patent Documents 1 and 2, the doctor needs to inject a contrast agent through the lumen of the guiding catheter in order to perform angiography after removing the aspiration catheter from the guiding catheter left in the blood vessel. If it is confirmed as a result of the doctor injecting the contrast agent that the aspiration of vascular deposits was insufficient, it is necessary to reinsert the removed aspiration catheter into the blood vessel (inside the guiding catheter) to aspirate the vascular deposits. In that case, it is necessary to insert the aspiration catheter into the blood vessel (inside the guiding catheter) many times, and there is a problem that a series of operations of the doctor become complicated because the switching between the aspiration of vascular deposits and the injection of the contrast agent is repeated.

[0005] This disclosure provides a technology for reducing the labor required when switching between aspiration of intravascular deposits and injection of contrast agent. [Means for solving the problem]

[0006] This disclosure is made to solve at least some of the problems described above and can be implemented in the following forms.

[0007] According to one embodiment of the present disclosure, a catheter is provided. The catheter comprises a first lumen extending along the longitudinal direction of the catheter and a second lumen extending along the longitudinal direction, wherein the tip of the first lumen is formed a first opening that opens to the tip of the catheter, and the tip of the second lumen is formed a second opening that opens to the side surface of the catheter. [Brief explanation of the drawing]

[0008] [Figure 1] This is an explanatory diagram illustrating the configuration of the catheter according to the first embodiment. [Figure 2] This is a cross-sectional view of the catheter according to the first embodiment. [Figure 3] This is a cross-sectional view of the catheter according to the first embodiment. [Figure 4] This is a cross-sectional view of the catheter according to the first embodiment. [Figure 5] This is an explanatory diagram illustrating the configuration of a catheter according to the second embodiment. [Figure 6] This is a cross-sectional view of the catheter according to the second embodiment. [Figure 7] This is a cross-sectional view of the catheter according to the second embodiment. [Figure 8] This is a cross-sectional view of the catheter according to the second embodiment. [Figure 9] This is an explanatory diagram illustrating the configuration of a catheter according to the third embodiment. [Figure 10] This is a cross-sectional view of the catheter according to the third embodiment. [Figure 11] This is a cross-sectional view of the catheter according to the third embodiment. [Figure 12] This is a cross-sectional view of the catheter according to the third embodiment. [Figure 13] This is a cross-sectional view of a catheter in another embodiment. [Figure 14] This is an explanatory diagram illustrating the configuration of a catheter in another embodiment. [Figure 15] This is an explanatory diagram illustrating the configuration of a catheter in another embodiment. [Modes for carrying out the invention]

[0009] <First Embodiment> Figure 1 is an explanatory diagram illustrating the configuration of catheter 1 according to the first embodiment. Catheter 1 is inserted into blood vessels, including cardiovascular and cerebrovascular vessels, and is used to aspirate and remove intravascular deposits such as stenotic lesions and occlusive lesions that have formed within the blood vessels. Catheter 1 may also be inserted into biological lumens such as the lymphatic system, biliary system, urinary tract system, airway system, digestive system, secretory glands, and reproductive organs, and used to aspirate and remove diseased tissue that has formed within the biological lumens. Catheter 1 comprises a first tube 10, a blade 20, a marker 30, a second tube 40, a sealing member 50, and a tip 60.

[0010] Figure 1 illustrates mutually orthogonal X, Y, and Z axes. The X-axis corresponds to the axial direction of catheter 1 (the insertion direction of catheter 1), the Y-axis corresponds to the width direction of catheter 1, and the Z-axis corresponds to the height direction of catheter 1. The left side of Figure 1 (+X-axis direction) is called the "tip side" of catheter 1 and its components, and the right side of Figure 1 (-X-axis direction) is called the "proximal end side" of catheter 1 and its components. For catheter 1 and its components, the end located on the tip side and its vicinity are called the "tip," and the end located on the proximal end and its vicinity are called the "proximal end." Of catheter 1, the tip side is the part inserted into the body, and the proximal end is the part manipulated by a physician or other operator. These points are also common in Figure 1 and subsequent figures.

[0011] FIG. 2 is a cross-sectional view of the catheter 1 taken along the line F2-F2 in FIG. 1. FIG. 3 is a cross-sectional view of the catheter 1 taken along the line F3-F3 in FIG. 1. FIG. 4 is a cross-sectional view of the catheter 1 taken along the line F4-F4 in FIG. 1.

[0012] The first tube 10 is a resin tubular member extending along the X-axis direction which is the longitudinal direction of the catheter 1. The first tube 10 has a substantially constant outer diameter. As the material forming the first tube 10, for example, resin materials such as polyamide resin, polyolefin resin, polyester resin, polyurethane resin, silicone resin, fluororesin, etc. can be adopted. The first tube 10 includes a first lumen L1. In other words, the first lumen L1 is formed inside the first tube 10. The first lumen L1 extends along the X-axis direction which is the longitudinal direction of the catheter 1. The tip of the first lumen L1 is a first opening OP1 connected to the outside of the catheter 1. In the present embodiment, the first opening OP1 is indirectly connected to the outside of the catheter 1 through the hollow portion of the tip chip 60 described later. A suction pump or a suction syringe can be connected to the proximal end (not shown) of the first lumen L1 via a connector or the like. In a state where the suction pump is connected, the first lumen L1 can suck intravascular deposits such as stenotic lesions and occlusive lesions generated in the blood vessel. That is, the catheter 1 is a suction catheter that sucks intravascular deposits into the first lumen L1 through the first opening OP1.

[0013] The blade 20 is a substantially tubular member extending along the X-axis direction. The blade 20 is a metal reinforcing body. The blade 20 is disposed on the radially outer side of the first tube 10 and covers the first tube 10. The radially outer side means the side in the YZ plane in the direction away from the center of the catheter 1. The blade 20 is formed by braiding wire strands. As the material forming the blade 20, for example, stainless steel (SUS302, SUS304, SUS316, etc.), superelastic alloys such as Ni-Ti alloy, radiation transmissive materials such as piano wire, and radiation non-transmissive materials such as platinum, gold, tungsten, etc. can be adopted.

[0014] Marker 30 is an annular member formed of a radiopaque material. Marker 30 is disposed radially outside at the tip of blade 20 and functions as a landmark representing the position of the tip of catheter 1. Marker 30 is formed of a material with a lower radiation transmittance compared to other members constituting catheter 1.

[0015] The second tube 40 is a tubular member extending along the X-axis direction. Specifically, the tip-side portion of the second tube 40 extends along the Z-axis direction. The second tube 40 is disposed radially outside of blade 20. As the material forming the second tube 40, a resin material similar to the material forming the first tube 10 can be adopted. The second tube 40 includes a second lumen L2. In other words, the second lumen L2 is formed inside the second tube 40. The second lumen L2 extends along the X-axis direction. Specifically, the tip-side portion of the second lumen L2 extends along the Z-axis direction. The tip of the second lumen L2 is the second opening OP2 that opens on the side surface of catheter 1. As shown in FIG. 3, in the present embodiment, the second opening OP2 opens toward the +Z-axis direction side. The second opening OP2 may open in any direction as long as it opens on the side surface of catheter 1. The second opening OP2 is located on the proximal side, that is, the -X-axis direction side, with respect to the first opening OP1. A syringe can be connected to the proximal end (not shown) of the second lumen L2 via a connector or the like. In a state where the syringe is connected, the second lumen L2 can flow a radiopaque contrast agent filled in the syringe. That is, catheter 1 is an injection catheter that injects a radiopaque contrast agent into the blood vessel through the second opening OP2 from the second lumen L2.

[0016] The sealing member 50 covers the first tube 10, the blade 20, the marker 30, and the second tube 40, and fixes the relative positions of the first tube 10, the blade 20, the marker 30, and the second tube 40. The sealing member 50 is molded to be cylindrical in shape. The material forming the sealing member 50 can be the same resin material as the material forming the first tube 10 and the second tube 40.

[0017] The tip 60 is a hollow component positioned at the tip of the catheter 1, which advances through the blood vessel ahead of other components. The proximal opening EP of the hollow portion of the tip 60 is connected to the first opening OP1. The material forming the tip 60 can be the same resin material as the material forming the first tube 10, the second tube 40, and the sealing member 50.

[0018] As shown in Figure 4, the cross-sectional area of ​​the first lumen L1 is larger than the cross-sectional area of ​​the second lumen L2. The cross-sectional area is the cross-sectional area when the catheter 1 is cut in the YZ plane. The cross-sectional area of ​​the second lumen L2 used for comparison with the cross-sectional area of ​​the first lumen L1 is the largest cross-sectional area of ​​the second lumen L2 at positions in the X-axis direction where the second opening OP2 does not exist. The cross-sectional area of ​​the first lumen L1 used for comparison with the cross-sectional area of ​​the second lumen L2 is the smallest cross-sectional area of ​​the first lumen L1. In this embodiment, the cross-sectional area of ​​the first lumen L1 is approximately constant at any position in the X-axis direction.

[0019] This section describes a method for aspirating and removing intravascular deposits, such as stenotic or occlusive lesions, within a blood vessel using catheter 1. First, the operator places catheter 1 within the lumen of the guiding catheter and delivers the guiding catheter and catheter 1 to the vicinity of the target site in the blood vessel where the intravascular deposits are located. Next, the operator activates a suction pump connected to the proximal end of the first lumen L1, aspirating the intravascular deposits into the first lumen L1 through the first opening OP1. After aspirating the intravascular deposits and stopping the suction pump, the operator injects contrast agent into the second lumen L2 from a syringe connected to the proximal end of the second lumen L2. The contrast agent injected into the second lumen L2 is then injected into the blood vessel through the second opening OP2 via the second lumen L2. After the injection of the contrast agent, the operator performs angiography. Subsequently, the operator refers to the images of the contrast-enhanced blood vessel to confirm whether blood flow in the blood vessel has been restored. If blood flow is open within the vessel, the operator withdraws the guiding catheter and catheter 1 from the vessel. If blood flow is not open within the vessel, the operator again activates the suction pump connected to the proximal end of the first lumen L1 to aspirate any intravascular deposits obstructing blood flow into the first lumen L1 through the first opening OP1.

[0020] As described above, according to the catheter 1 of the first embodiment, after aspirating intravascular deposits using the first lumen L1, contrast agent can be injected into the blood vessel from the second lumen L2 without removing the catheter 1. Therefore, when injecting contrast agent, it is not necessary to remove the aspiration catheter 1 from the blood vessel and it can be left in place. If it is confirmed by angiography that the aspiration of intravascular deposits was insufficient, the intravascular deposits can be aspirated again using the first lumen L1 of the catheter 1 that has been left in the blood vessel. Therefore, according to the catheter 1 of the first embodiment, since it is not necessary to insert and remove the aspiration catheter when switching between aspiration of intravascular deposits and injection of contrast agent, the work required when switching between aspiration of intravascular deposits and injection of contrast agent can be reduced.

[0021] For example, in a conventional catheter that does not have a second lumen and only has a first lumen, if the first lumen used for aspirating intravascular deposits is also used for injecting contrast agent into the blood vessel, there is a risk that if intravascular deposits remain in the first lumen, those deposits may be returned to the blood vessel from the catheter by the injection of contrast agent. In this regard, according to the catheter 1 of the first embodiment, since contrast agent is injected into the blood vessel using a second lumen L2 separate from the first lumen L1 used for aspirating intravascular deposits, it is possible to prevent intravascular deposits from being returned to the blood vessel from the catheter 1 even if intravascular deposits remain in the first lumen L1.

[0022] According to the catheter 1 of the first embodiment, since the second opening OP2 at the tip of the second lumen L2 opens to the side of the catheter 1, when a contrast agent is injected into the blood vessel via the second lumen L2, the rate at which the contrast agent advances distally into the blood vessel can be reduced compared to when the contrast agent is injected into the blood vessel through an opening facing the tip of the catheter. Therefore, if there are vascular deposits remaining in the target site in the blood vessel that has already been aspirated, the speed of the contrast agent when it comes into contact with these vascular deposits is relatively low, thus suppressing the removal of these vascular deposits from the blood vessel by contact with the contrast agent. Consequently, it is possible to prevent vascular deposits remaining in the blood vessel from becoming distal embolisms.

[0023] In the catheter 1 of the first embodiment, the relative positions of the first tube 10 and the second tube 40 are fixed by the sealing member 50. This prevents the first tube 10 and the second tube 40 from becoming entangled or twisted within the catheter 1. As a result, the cross-sectional area of ​​the first lumen L1 and the cross-sectional area of ​​the second lumen L2 are prevented from becoming smaller, thus preventing a decrease in the adsorption efficiency of intravascular deposits by the first lumen L1 and the injection efficiency of contrast agent into the blood vessel by the second lumen L2.

[0024] In the catheter 1 of the first embodiment, the cross-sectional area of ​​the first lumen L1 is larger than that of the second lumen L2. Therefore, because the cross-sectional area of ​​the first lumen L1 is relatively large, intravascular deposits can be efficiently aspirated. Because the cross-sectional area of ​​the second lumen L2 is relatively small, the amount of contrast agent released into the blood vessel from the second opening OP2 per unit time is relatively small. This prevents intravascular deposits remaining in the target area of ​​the blood vessel that has already been aspirated from being detached and becoming distal embolized.

[0025] <Second Embodiment> Figure 5 is an explanatory diagram illustrating the configuration of catheter 1a in the second embodiment. Compared to catheter 1 in the first embodiment, catheter 1a in the second embodiment differs from catheter 1 in that it mainly has a first tube 10a instead of the first tube 10.

[0026] Figure 6 is a cross-sectional view of catheter 1a along the F6-F6 line in Figure 5. Figure 7 is a cross-sectional view of catheter 1a along the F7-F7 line in Figure 5. Figure 8 is a cross-sectional view of catheter 1a along the F8-F8 line in Figure 5.

[0027] The first tube 10a, like the first tube 10, is a tubular resin member extending along the X-axis. In the following description, the position of the tip of the second lumen L2 in the X-axis direction is called the reference position RP. The section in the X-axis direction from the reference position RP toward the proximal end of the second lumen L2 is called section S2. Section S2 corresponds to the section in the X-axis direction where the second lumen L2 is provided. The section in the X-axis direction from the tip of the catheter 1a to the reference position RP is called section S1. Section S1 corresponds to the section in the X-axis direction where the second lumen L2 is not provided. The enlarged section EL shown in Figure 5 will be described later.

[0028] The diameter of the first lumen La1 in section S2 is approximately constant. The diameter of the first lumen La1 in section S1 is larger than the diameter of the first lumen La1 in section S2 at any position along the X-axis. Thus, in catheter 1a, the entire area of ​​the first lumen La1 in section S1 is an enlarged portion EL with a larger cross-sectional area than the cross-sectional area of ​​the first lumen La1 in section S2.

[0029] In this embodiment, as shown in Figures 6 to 8, the cross-sectional shape of the first lumen La1 is circular in both section S1 and section S2. Therefore, it can be said that the diameter IDa of the first lumen La1 is larger than the diameter IDb of the first lumen La1 in section S2 at any position in section S1.

[0030] In the first lumen La1 in section S2, the presence of the second lumen L2 tends to restrict the size of the cross-sectional area of ​​the first lumen La1 compared to the case where the second lumen L2 is not provided. This reduction in the cross-sectional area of ​​the first lumen La1 due to such constraints can decrease the suction efficiency of intravascular deposits. In this regard, according to the catheter 1a of the second embodiment described above, even if the cross-sectional area of ​​the first lumen La1 is reduced due to the presence of the second lumen L2, the entire area of ​​the first lumen La1 in section S1 is the enlarged section EL, so the suction efficiency of the first lumen La1 can be ensured.

[0031] <Third Embodiment> Figure 9 is an explanatory diagram illustrating the configuration of the catheter 1b of the third embodiment. The catheter 1b of the third embodiment differs from the catheter 1 of the first embodiment mainly in that it is equipped with a sealing member 50b instead of a sealing member 50.

[0032] Figure 10 is a cross-sectional view of catheter 1b along the F10-F10 line in Figure 9. Figure 11 is a cross-sectional view of catheter 1b along the F11-F11 line in Figure 9. Figure 12 is a cross-sectional view of catheter 1b along the F12-F12 line in Figure 9.

[0033] The sealing member 50b, like the sealing member 50, fixes the relative positions of the first tube 10, the blade 20, the marker 30, and the second tube 40. The general shape of the sealing member 50b is molded to include two cylindrical portions of different diameters. In Figure 9, the reference position RP, section S1, and section S2 are the same as in the second embodiment. The cross-sectional area of ​​the catheter 1b in section S2 is approximately constant. The cross-sectional area of ​​the catheter 1b in section S2 includes the cross-sectional area of ​​the first lumen L1 and the cross-sectional area of ​​the second lumen L2. In such a catheter 1b, the portion P (shown in Figure 9) of the catheter 1b in section S1, including the tip, is a reduced portion SH with a smaller cross-sectional area than the cross-sectional area of ​​the catheter 1b in section S2. The cross-sectional area of ​​the catheter 1b in the reduced portion SH includes the cross-sectional area of ​​the first lumen L1.

[0034] In this embodiment, as shown in Figures 10 to 12, the cross-sectional shape of the catheter 1b is circular in both section S1 and section S2. Therefore, it can be said that the diameter ODa of the catheter 1b in section P is smaller than the diameter ODb of the catheter 1b in section S2.

[0035] In section S2, the cross-sectional area of ​​catheter 1b tends to be larger than in cases where the second lumen L2 is not provided, due to the presence of the second lumen L2. This increase in the cross-sectional area of ​​catheter 1b can make it difficult to deliver catheter 1b to the vicinity of the target site within the blood vessel. In this regard, according to the catheter 1b of the third embodiment described above, even if the cross-sectional area of ​​catheter 1b is increased due to the presence of the second lumen L2, the leading portion P of catheter 1b delivered to the distal side of the blood vessel is the narrowed portion SH, making it easier to deliver catheter 1b to the distal side of the blood vessel.

[0036] <Modified form of this embodiment> This disclosure is not limited to the embodiments described above, and can be implemented in various forms without departing from its essence, including, for example, the following modifications.

[0037] In the first to third embodiments described above, the first opening OP1 was indirectly connected to the outside of the catheters 1, 1a, and 1b via the hollow portion of the tip 60. Alternatively, the first opening OP1 may be directly connected to the outside of the catheter 1 by having the tips of the first lumens L1 and La1 (first tubes 10 and 10a) extend to the tip of the hollow portion of the tip 60.

[0038] In the first to third embodiments described above, the first opening OP1 was connected to the outside of catheters 1, 1a, and 1b by opening toward the tip side (+X axis side) of catheters 1, 1a, and 1b. The first opening OP1 may open toward the side of catheters 1, 1a, and 1b, for example, similar to the second opening OP2, as long as it is connected to the outside of catheters 1, 1a, and 1b.

[0039] In the first to third embodiments described above, the cross-sectional shape of the first lumen L1,La1 was circular. The cross-sectional shape of the first lumen L1,La1 may be an elliptical shape, a polygon, or any other arbitrary shape other than a circle.

[0040] In the first to third embodiments described above, the cross-sectional shape of the second lumen L2 was rectangular. The cross-sectional shape of the second lumen L2 may be circular, elliptical, polygonal, or any other arbitrary shape other than rectangular.

[0041] In the first to third embodiments described above, the sealing members 50 and 50b were molded so that the cross-sectional shape of the catheters 1, 1a, and 1b was circular. The cross-sectional shape of the catheters 1, 1a, and 1b may be an ellipse, rectangle, polygon, or any other arbitrary shape other than a circle.

[0042] In the first to third embodiments described above, a blade 20 was provided. Other metal reinforcements may be used instead of the blade 20. For example, a coil, or both a coil and a blade, may be used.

[0043] In the first to third embodiments described above, the cross-sectional area of ​​the first lumen L1,La1 was larger than the cross-sectional area of ​​the second lumen L2. The cross-sectional area of ​​the first lumen L1,La1 may be smaller than the cross-sectional area of ​​the second lumen L2.

[0044] In the second embodiment described above, the entire area of ​​the first lumen La1 in section S1 was the enlarged portion EL. The enlarged portion EL may be a narrower area than the entire area of ​​the first lumen La1 in section S1, as long as the tip of the first lumen La1 is included. That is, the portion of the first lumen La1 in section S1 that includes the tip may be the enlarged portion EL. The portion of the first lumen La1 that includes the tip refers to the portion of the first lumen La1 from the tip to a position closer to the tip than the reference position RP.

[0045] In the second embodiment described above, the diameter of the first lumen La1 in section S2 was approximately constant. For example, the diameter of the first lumen La1 in section S2 may vary depending on the position in the X-axis direction. In such a case, the enlarged portion EL is the portion of the first tube 10a whose cross-sectional area is larger than the largest cross-sectional area of ​​the first lumen La1 in section S2.

[0046] In the third embodiment described above, the portion P of the catheter 1b in section S1, including the tip, was the reduced portion SH. The entire area of ​​the catheter 1b in section S1 may be the reduced portion SH, as long as the tip of the catheter 1b is included.

[0047] In the third embodiment described above, the cross-sectional area of ​​the catheter 1b in section S2 was approximately constant. For example, the cross-sectional area of ​​the catheter 1b in section S2 may differ depending on the position in the X-axis direction. In such a case, the reduced portion SH is the part of the catheter 1b whose cross-sectional area is smaller than the smallest cross-sectional area of ​​the catheter 1b in section S2.

[0048] Figure 13 is a cross-sectional view of a catheter 1c of a different embodiment from the first to third embodiments. Compared to the catheter 1 of the first embodiment, catheter 1c has a second tube 40c instead of the second tube 40, which is different from the second tube 40. Inside the second tube 40c, a second lumen Lc2 is formed, extending along the X-axis. The cross-sectional shape of the second lumen Lc2 is an arc shape that follows the circular cross-sectional shape of the first lumen L1. With this form of catheter 1c, the cross-sectional area of ​​the second lumen Lc2 can be made wider compared to the case where the cross-sectional shape of the second lumen is rectangular, so that the contrast agent can be efficiently flowed into the second opening OP2.

[0049] Figure 14 is an explanatory diagram illustrating the configuration of catheter 1d in a different embodiment from the first to third embodiments. Catheter 1d differs from catheter 1 of the first embodiment in that it further includes a third tube 70. The third tube 70 is a tubular member that extends along the X-axis direction, similar to the second tube 40. A third lumen L3 is formed inside the third tube 70. The tip of the third lumen L3 is a third opening OP3 that opens on the side of catheter 1d. A syringe can be connected to the base end (not shown) of the third lumen L3 via a connector or the like. When a syringe is connected, the third lumen L3 can circulate the radiopaque contrast agent filled in the syringe. In other words, catheter 1d is an injection catheter that injects radiopaque contrast agent into the blood vessel from the third lumen L3 via the third opening OP3, in addition to the second lumen L2. Therefore, with this type of catheter 1d, contrast agent can be injected into the blood vessel simultaneously from both the second opening OP2 and the third opening OP3, allowing for rapid injection of the contrast agent into the blood vessel.

[0050] Figure 15 is an explanatory diagram illustrating the configuration of a catheter 1e in a different embodiment from the first to third embodiments. Compared to the catheter 1 of the first embodiment, catheter 1e is equipped with a second tube 40e, which is different from the second tube 40, instead of the second tube 40. The second tube 40e is a tubular member that extends along the X-axis direction, similar to the second tube 40. While the tip portion of the second tube 40 extended along the Z-axis direction (see Figures 1 and 3), the tip portion of the second lumen Le2 extends in a direction inclined from the Z-axis direction toward the -X-axis direction. In other words, the tip portion of the second lumen Le2 extends in a direction inclined toward the proximal end side (-X-axis direction side) of catheter 1e with respect to the plane perpendicular to the X-axis direction (YZ plane), which is the longitudinal direction of catheter 1e. With this configuration of catheter 1e, the speed at which the contrast agent injected into the blood vessel from the second opening OP2 progresses distally within the blood vessel can be further reduced. Therefore, if there are any vascular deposits remaining in the target area within the blood vessel after aspiration, it is possible to further prevent these deposits from being detached and causing distal embolism.

[0051] This embodiment has been described above based on embodiments and modifications. The embodiments described above are for the purpose of facilitating understanding of this embodiment and do not limit it. This embodiment can be modified and improved without departing from its spirit and the scope of the claims, and equivalents thereof are included in this embodiment. Technical features that are not described as essential in this specification may be deleted as appropriate.

Claims

1. Catheters (1, 1a, 1b, 1c, 1d, 1e), The catheter (1, 1a, 1b, 1c, 1d, 1e) has a first lumen (L1, La1) extending along its longitudinal direction, It comprises a second lumen (L2, Lc2, Le2) extending along the longitudinal direction, The tip of the first lumen (L1, La1) is a first opening (OP1) connected to the outside of the catheter (1, 1a, 1b, 1c, 1d, 1e), The tip of the second lumen (L2, Lc2, Le2) is a second opening (OP2) that opens on the side of the catheter (1, 1a, 1b, 1c, 1d, 1e), the catheter (1, 1a, 1b, 1c, 1d, 1e).

2. A catheter (1, 1a, 1b, 1c, 1d, 1e) according to claim 1, further, A first tube (10, 10a) extending along the longitudinal direction, A second tube (40, 40c, 40e) extending along the longitudinal direction, The device comprises sealing members (50, 50b) that cover the first tube (10, 10a) and the second tube (40, 40c, 40e) and fix the relative positions of the first tube (10, 10a) and the second tube (40, 40c, 40e), The first tube (10, 10a) includes the first lumen (L1, La1), The second tube (40, 40c, 40e) is a catheter (1, 1a, 1b, 1c, 1d, 1e) including the second lumen (L2, Lc2, Le2).

3. A catheter (1, 1a, 1b, 1c, 1d, 1e) according to claim 1 or claim 2, A catheter (1, 1a, 1b, 1c, 1d, 1e) in which the cross-sectional area of ​​the first lumen (L1, La1) is larger than the cross-sectional area of ​​the second lumen (L2, Lc2, Le2).

4. A catheter (1a) according to any one of claims 1 to 3, A catheter (1a) in which the portion of the first lumen (La1) including its tip in the section (S1) in which the second lumen (L2, Lc2, Le2) is not provided in the longitudinal direction is an enlarged portion (EL) with a larger cross-sectional area than the first lumen (La1) in the section (S2) in which the second lumen (L2, Lc2, Le2) is provided in the longitudinal direction.

5. A catheter (1b) according to any one of claims 1 to 4, In the longitudinal direction, the portion (P) of the catheter (1b) including the tip in the section (S1) where the second lumen (L2, Lc2, Le2) is not provided is a reduced portion (SH) whose cross-sectional area is smaller than that of the catheter (1b) in the longitudinal direction where the second lumen (L2, Lc2, Le2) is provided (S2), the catheter (1b).

6. A catheter (1, 1a, 1b, 1c, 1d, 1e) according to any one of claims 1 to 5, The catheter (1, 1a, 1b, 1c, 1d, 1e) is a suction catheter that aspirates intravascular deposits into the first lumen (L1, La1) through the first opening (OP1).

7. A catheter (1, 1a, 1b, 1c, 1d, 1e) according to any one of claims 1 to 6, The catheters (1, 1a, 1b, 1c, 1d, 1e) are injection catheters that inject radiopaque contrast agents into blood vessels from the second lumen (L2, Lc2, Le2) through the second opening (OP2).

Images