Catheter, catheter system and treatment method

Abstract

A catheter for supporting a lesion-crossing catheter, a catheter system, and a treatment method are provided that can improve the passability of the lesion-crossing catheter through a venous lesion. [Solution] The support catheter (40) is provided with a long third tubular body (41) used for passing through venous lesions, and the third tubular body (41) has an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less.

Description

[Technical Field]

[0001] The present invention relates to catheters, catheter systems and treatment methods. [Background technology]

[0002] In vascular treatment, when passing a guidewire through a lesion, a procedure is performed in which the guidewire is inserted into and supported by a device into which the guidewire can be inserted (a lesion-passing catheter), and the lesion-passing catheter is passed through the lesion together with the guidewire (see, for example, Patent Document 1).

[0003] Incidentally, in the treatment of deep vein thrombosis (DVT), lesion-crossing catheters for arteries are being repurposed. The target blood vessels for deep vein thrombosis are veins more peripheral than the inferior vena cava, such as the iliac vein, femoral vein, or popliteal vein. The diameter of a vein is generally larger than that of an artery. For example, the inner diameter of an artery through which a catheter is accessed is approximately 3 Fr to 8 Fr, while the inner diameter of a vein through which a catheter is accessed is approximately 6 Fr to 24 Fr. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2005-533554 Summary of the Invention [Problem to be solved by the invention]

[0005] Because no lesion crossing catheters for accessing venous lesions that are adapted to the venous vascular diameter and lesion are known, using a thin lesion crossing catheter designed for arteries intravenously can result in the lesion crossing catheter easily bending in a large vein, potentially reducing its ability to pass through the lesion. Furthermore, a thin lesion crossing catheter is preferable for passing through an organized thrombus. Therefore, a parent catheter is required to guide the lesion crossing catheter when used in a large vein. However, if the outer diameter of the lesion crossing catheter is too small compared to the inner diameter of the parent catheter that is adapted to the venous vascular diameter, the lesion crossing catheter will bend inside the parent catheter, reducing its ability to pass through the lesion.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide a catheter, a catheter system, and a treatment method for supporting a lesion-crossing catheter that can improve the passability of the lesion-crossing catheter to venous lesions. [Means for solving the problem]

[0007] The above object can be achieved by the invention described in (1) below.

[0008] (1) The catheter of the present invention is a catheter having a long tubular body used for passing through venous lesions, characterized in that the inner diameter of the tubular body is 1.4 mm or more and the outer diameter is 2.8 mm or less. [Effects of the Invention]

[0009] The catheter described in (1) above can satisfactorily support a lesion-crossing catheter having an outer diameter that is significantly smaller than the inner diameter of the parent catheter, with an upper outer diameter of approximately 1.4 mm, inside a parent catheter that is suitable for veins and has a lower inner diameter of approximately 2.8 mm. This catheter therefore improves the passability of the lesion-crossing catheter through venous lesions.

[0010] (2) In the catheter described in (1) above, the outer diameter of the tubular body may be 2.0 mm or less, thereby enabling the lesion-passing catheter to be well supported inside a parent catheter that is adapted to a vein and has an inner diameter of approximately 2.0 mm at its lower limit.

[0011] (3) In the catheter described in (1) or (2) above, a lubricious coating may be applied to at least the outer peripheral surface of the distal end of the tubular body. This reduces friction on the outer peripheral surface of the distal end of the tubular body. Thrombi formed in veins tend to extend longer in the longitudinal direction of blood vessels than thrombi formed in arteries. Therefore, the low friction of the outer peripheral surface of the tubular body due to the lubricious coating applied to the outer peripheral surface of the tubular body is very effective when passing the tubular body through a long venous thrombus.

[0012] (4) In the catheter described in any one of (1) to (3) above, the effective length of the tubular body may be less than 1000 mm. This makes the catheter effective for treating deep veins, where the length from the access point to the lesion location to the blood vessel is likely to be less than 1000 mm. The longer the effective length, the less maneuverable the catheter becomes, so it is desirable that the effective length be as short as possible without causing any problems.

[0013] (5) A catheter system for achieving the above object is a catheter system used for passing through a lesion in a vein, comprising a catheter, a lesion-crossing catheter insertable into said catheter, a parent catheter into which said catheter can be inserted, an inner catheter insertable into said lesion-crossing catheter, and an outer catheter into which said parent catheter can be inserted, wherein these tubular bodies are coaxially stacked from the inside to the outside in the order of the inner catheter, the lesion-crossing catheter, said catheter, the parent catheter, and the outer catheter. Thus, the catheter system is adapted to the vein and can be pushed coaxially through the vein, thereby improving the passability of the lesion-crossing catheter and guidewire through the venous lesion.

[0014] (6) A catheter system for achieving the above object is a catheter system used for passing through a venous lesion, characterized by comprising: a catheter having a long tubular body with an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less; a lesion crossing catheter insertable into the tubular body of the catheter; and a parent catheter into which the catheter can be inserted. As a result, the catheter system can satisfactorily support the lesion crossing catheter, which has an outer diameter significantly smaller than the inner diameter of the parent catheter and an upper outer diameter of approximately 1.4 mm, inside the parent catheter, which is adapted to a vein and has a lower inner diameter of approximately 2.8 mm. Therefore, the catheter system can improve the passability of the lesion crossing catheter through a venous lesion.

[0015] (7) The catheter system described in (6) above may further include an inner catheter insertable into the lesion-crossing catheter and an outer catheter insertable into the parent catheter, thereby further improving the passability of the lesion-crossing catheter to a venous lesion.

[0016] (8) A treatment method for achieving the above object is a treatment method for passing at least a part of a catheter system together with a guidewire through a venous lesion, characterized in that the catheter system includes a long tubular catheter having an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less, the tubular body being inserted into a parent catheter, and the lesion-crossing catheter is inserted into the tubular body and passed through the venous lesion. This treatment method allows the lesion-crossing catheter, which has an outer diameter significantly smaller than the inner diameter of the parent catheter and an upper outer diameter of approximately 1.4 mm, to be well supported inside the parent catheter, which has an inner diameter of approximately 2.8 mm to accommodate the vein. This treatment method therefore improves the passability of the catheter system through the venous lesion.

[0017] (9) In the treatment method described in (8) above, the parent catheter may be inserted into the outer catheter, and the inner catheter may be inserted into the lesion-crossing catheter to pass through the venous lesion using the catheter system. This further improves the passability of the lesion-crossing catheter through the venous lesion. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a plan view showing an assembled state of a catheter system according to an embodiment. [Figure 2] FIG. 1 is a plan view showing a catheter system according to an embodiment in a separated state. [Figure 3] FIG. 2 is a cross-sectional view taken along line AA in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the dimensional proportions in the drawings may be exaggerated for convenience of explanation and may differ from the actual proportions. In the following description, the side of the catheter that is operated will be referred to as the "proximal end" and the side that is inserted into the living body will be referred to as the "distal end."

[0020] A catheter system 10 according to an embodiment of the present invention is a device used to pass a guidewire to a lesion in the treatment of deep vein thrombosis (DVT). The catheter system 10 is inserted through a vein, such as the knee, and pushed into the blood vessel to be treated. The blood vessel to be treated is a vein more peripheral than the inferior vena cava (e.g., the iliac vein, femoral vein, or popliteal vein).

[0021] 1 to 3, the catheter system 10 comprises a lesion crossing catheter 30, an inner catheter 20 inserted into the lesion crossing catheter 30, a support catheter 40 (catheter) that supports the lesion crossing catheter 30, a parent catheter 50 that guides the support catheter 40, and an outer catheter 60 that guides the parent catheter 50. In the catheter system 10, these tubular bodies are coaxially stacked in the following order from the inside to the outside: inner catheter 20, lesion crossing catheter 30, support catheter 40, parent catheter 50, and outer catheter 60. Note that the catheter system 10 does not necessarily have to comprise the outer catheter 60 and / or the inner catheter 20.

[0022] The lesion passing catheter 30 has a second tubular body 31 formed with a second lumen 32 into which a guidewire can be inserted to pass through a venous lesion. The lesion passing catheter 30 covers and supports the guidewire inserted into the second lumen 32, and is used to pass through the lesion together with the guidewire. The inner catheter 20 can be inserted into the second lumen 32 instead of a guidewire. In this case, the lesion passing catheter 30 covers and supports the inner catheter 20 in order to pass the inner catheter 20 and a thinner guidewire that can be inserted into the inner catheter 20 through the lesion, and is used to pass through the lesion together with the inner catheter 20 and the guidewire.

[0023] The inner catheter 20 has a first tubular body 21 formed with a first lumen 22 into which a guidewire to be passed to a venous lesion can be inserted. The inner catheter 20 covers and supports the guidewire inserted into the first lumen 22, and is used to pass through the lesion together with the guidewire. The guidewire that can be inserted into the inner catheter 20 is thinner than the guidewire that can be inserted into the lesion crossing catheter 30. For example, when a thick guidewire inserted into the lesion crossing catheter 30 cannot pass through the lesion, the inner catheter 20 is inserted into the second lumen 32 of the lesion crossing catheter 30 to support the thin guidewire. Note that the inner catheter 20 does not necessarily have to be used.

[0024] The support catheter 40 (catheter) has a third tubular body 41 (tubular body) formed with a third lumen 42 into which the lesion crossing catheter 30 can be inserted. The support catheter 40 supports the lesion crossing catheter 30, the inner catheter 20, and the guidewire inserted into the inner catheter 20, which are inserted into the third lumen 42, and is used to pass through a lesion together with the lesion crossing catheter 30, the inner catheter 20, and the guidewire. When the inner catheter 20 is not inserted into the lesion crossing catheter 30, the support catheter 40 supports the lesion crossing catheter 30 inserted into the third lumen 42 and the guidewire inserted into the lesion crossing catheter 30, and is used to pass through a lesion together with the lesion crossing catheter 30 and the guidewire. When the lesion crossing catheter 30 and other catheters it supports pass through a lesion, the support catheter 40 may or may not pass completely through the lesion.

[0025] The outer circumferential surface of at least the distal end of the third tubular body 41 may be coated with a lubricious coating 43. The lubricious coating 43 may be, for example, a hydrophilic polymer, such as a cellulose-based polymer, a polyethylene oxide-based polymer, a maleic anhydride-based polymer (e.g., a maleic anhydride copolymer such as a methyl vinyl ether-maleic anhydride copolymer), an acrylamide-based polymer (e.g., a polyacrylamide or a glycidyl methacrylate-dimethylacrylamide block copolymer), a water-soluble nylon, polyvinyl alcohol, polyvinylpyrrolidone, or a derivative thereof. Hydrophilic polymers form a strong water immobilization layer on their surface, exhibiting high affinity for blood in blood vessels and blood vessel walls, as well as low friction. Alternatively, the lubricious coating 43 may be a low-friction material, such as a fluororesin such as polytetrafluoroethylene (PTFE) or high-density polyethylene (HDPE). Meanwhile, thrombi formed in veins tend to form longer along the length of the blood vessel than thrombi formed in arteries. Therefore, the low friction of the outer peripheral surface of the third tubular body 41 is extremely effective when the third tubular body 41 passes through a venous thrombus.

[0026] The effective length L of the support catheter 40 is not particularly limited, but is preferably less than 1000 mm. The effective length L of the support catheter 40 is the length of the portion that can be inserted into a blood vessel or a tubular device. In this embodiment, the effective length L of the support catheter 40 is the length from the most distal end of the hub or anti-kink protector at the proximal end to the most distal end of the third tubular body 41.

[0027] The parent catheter 50 has a fourth tubular body 51 formed with a fourth lumen 52 through which the support catheter 40 can be inserted. The parent catheter 50 is used to secure a passageway within a blood vessel. Alternatively, the parent catheter 50 is used to support the support catheter 40 inserted into the fourth lumen 52 and other catheters and guidewires therein, and to assist at least some of these catheters in passing through a lesion. The parent catheter 50 is, for example, an introducer sheath or a guiding sheath.

[0028] The outer catheter 60 has a fifth tubular body 61 with a fifth lumen 62 formed therein, into which the parent catheter 50 can be inserted. The outer catheter 60 is used to secure a passageway within a blood vessel. Alternatively, the outer catheter 60 is used to support the parent catheter 50 inserted into the fifth lumen 62 and other catheters and guidewires therein, and to assist at least some of these catheters in passing through a lesion. The outer catheter 60 is, for example, an introducer sheath or a guiding sheath. Note that the outer catheter 60 does not necessarily have to be used.

[0029] Examples of the inner and outer diameters of each catheter are shown in Table 1.

[0030] [Table 1]

[0031] The inner diameter of the first tubular body 21 of the inner catheter 20 is not particularly limited, but is preferably 0.36 mm to 0.60 mm. The outer diameter of the first tubular body 21 is not particularly limited, but is preferably 0.70 mm to 0.90 mm.

[0032] The inner diameter of the second tubular body 31 of the lesion-passing catheter 30 is not particularly limited, but is preferably 0.86 mm to 1.2 mm. The outer diameter of the second tubular body 31 is not particularly limited, but is preferably 1.2 mm to 1.4 mm.

[0033] The inner and outer diameters of the third tubular body 41 of the support catheter 40 are not particularly limited, but are set appropriately depending on the dimensions of the parent catheter 50 to be inserted. For example, if the parent catheter 50 is a 6 Fr guiding sheath, the inner diameter of the third tubular body 41 is preferably 1.4 mm to 1.6 mm, and the outer diameter of the third tubular body 41 is preferably 1.6 mm to 2.0 mm. If the parent catheter 50 is an 8 Fr guiding sheath, the inner diameter of the third tubular body 41 is preferably 1.4 mm to 2.5 mm, and the outer diameter of the third tubular body 41 is preferably 2.0 mm to 2.8 mm. That is, overall, the inner diameter of the third tubular body 41 of the support catheter 40 is preferably 1.4 mm to 2.5 mm, and the outer diameter of the third tubular body 41 is preferably 1.6 mm to 2.8 mm.

[0034] The inner and outer diameters of the fourth tubular body 51 of the parent catheter 50 are not particularly limited, but when the parent catheter 50 is a 6 Fr guiding sheath, the inner diameter of the fourth tubular body 51 is preferably 1.6 mm to 2.5 mm, and the outer diameter of the fourth tubular body 51 is preferably 1.8 mm to 2.8 mm. When the parent catheter 50 is an 8 Fr guiding sheath, the inner diameter of the fourth tubular body 51 is preferably 2.8 mm to 3.0 mm, and the outer diameter of the fourth tubular body 51 is preferably 3.0 mm to 3.6 mm. That is, overall, the inner diameter of the fourth tubular body 51 of the parent catheter 50 is preferably 1.6 mm to 3.0 mm, and the outer diameter of the fourth tubular body 51 is preferably 1.8 mm to 3.6 mm.

[0035] The inner and outer diameters of the fifth tubular body 61 of the outer catheter 60 are not particularly limited, but when the outer catheter 60 is an 8 Fr guiding sheath, the inner diameter of the fifth tubular body 61 is preferably 2.8 mm to 3.0 mm, and the outer diameter of the fifth tubular body 61 is preferably 3.0 mm to 3.6 mm.

[0036] The outer diameter of the inner catheter 20 is less than the inner diameter of the lesion-passing catheter 30, the outer diameter of the lesion-passing catheter 30 is less than the inner diameter of the support catheter 40, the outer diameter of the support catheter 40 is less than the inner diameter of the parent catheter 50, and the outer diameter of the parent catheter 50 is less than the inner diameter of the outer catheter 60.

[0037] The combination patterns for each catheter are shown in Table 2.

[0038] [Table 2]

[0039] In pattern A-1, a 6Fr sheath is used to secure the blood vessel, and the parent catheter 50 and outer catheter 60 are not used. The lesion crossing catheter 30 is required, and the inner catheter 20 and support catheter 40 are optional. After the guidewire has passed through the lesion, the sheath is upsized to insert a device for IVUS (intravascular ultrasound) or a thrombectomy (thrombectomy) device. When the optional inner catheter 20 is used, the lesion crossing catheter 30 serves to support the inner catheter 20 and below (the inner catheter 20 and the guidewire inside it). When the inner catheter 20 is not used, the lesion crossing catheter 30 serves to support the guidewire. The support catheter 40 serves to support the lesion crossing catheter 30 and below (the lesion crossing catheter 30 and all catheters and guidewires inside it).

[0040] Pattern A-2 differs from Pattern A-1 only in that a parent catheter 50 is used without a sheath. That is, Pattern A-2 is performed using a sheathless approach. In Pattern A-2, the lesion crossing catheter 30 and parent catheter 50 are required, while the inner catheter 20 and support catheter 40 are optional. The parent catheter 50 is used to secure the blood vessel. The parent catheter 50 may also play a role in supporting the support catheter 40 and below (the support catheter 40 and all catheters and guidewires inside it).

[0041] In pattern B-1, an 8Fr sheath is used to secure the blood vessel, and the outer catheter 60 is not used. The lesion crossing catheter 30 is required, and the inner catheter 20, support catheter 40, and parent catheter 50 are optional. After the guidewire has passed through the lesion, the sheath is sized up to insert a device for IVUS (intravascular ultrasound) or a device for thrombectomy. When the optional inner catheter 20 is used, the lesion crossing catheter 30 serves to support the inner catheter 20 and below. When the inner catheter 20 is not used, the lesion crossing catheter 30 serves to support the guidewire. The support catheter 40 serves to support the lesion crossing catheter 30 and below. The parent catheter 50 serves to support the support catheter 40 and below.

[0042] Pattern B-2 differs from Pattern B-1 only in that an outer catheter 60 is used without a sheath. That is, Pattern B-2 is performed using a sheathless approach. In Pattern B-2, the lesion-crossing catheter 30 and the outer catheter 60 are required, while the inner catheter 20, support catheter 40, and parent catheter 50 are optional. The outer catheter 60 is used to secure the blood vessel. The outer catheter 60 may play a role in supporting the parent catheter 50 and below (the parent catheter 50 and all catheters and guidewires inside it).

[0043] In pattern C, a 12 Fr or larger sheath is used to secure the blood vessel. The lesion crossing catheter 30 is required, while the inner catheter 20, support catheter 40, parent catheter 50, and outer catheter 60 are optional. When the optional inner catheter 20 is used, the lesion crossing catheter 30 serves to support the inner catheter 20. When the inner catheter 20 is not used, the lesion crossing catheter 30 serves to support the guidewire. The support catheter 40 serves to support the lesion crossing catheter 30 and below. The parent catheter 50 serves to support the support catheter 40 and below. The outer catheter 60 serves to support the parent catheter 50 and below.

[0044] As shown in Fig. 1, the catheter system 10 is a combination of an inner catheter 20, a lesion-crossing catheter 30, a support catheter 40, a parent catheter 50, and an outer catheter 60, and is used to pass a guidewire through a venous lesion (e.g., organized venous embolus). Note that the catheter system 10 does not necessarily have to include all of these components. For example, the catheter system 10 does not necessarily have to include the inner catheter 20 and / or the outer catheter 60.

[0045] As described above, the support catheter 40 (catheter) according to this embodiment is a support catheter 40 equipped with a long third tubular body 41 (tubular body) used for passing through a venous lesion, and the third tubular body 41 has an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less. As a result, the support catheter 40 can favorably support the lesion crossing catheter 30, which has an upper outer diameter of approximately 1.4 mm and an outer diameter significantly smaller than the inner diameter of the parent catheter 50, inside the parent catheter 50, which has an inner diameter of approximately 2.8 mm to accommodate a vein. Therefore, the support catheter 40 can improve the passability of the lesion crossing catheter 30 through a venous lesion.

[0046] The outer diameter of the third tubular body 41 may be 2.0 mm or less, which allows the support catheter 40 to adequately support the lesion-passing catheter 30 inside the parent catheter 50, which is adapted to veins and has an inner diameter with a lower limit of approximately 2.0 mm.

[0047] A lubricating coating 43 may be applied to the outer peripheral surface of at least the tip of the third tubular body 41. This reduces friction on the outer peripheral surface of the tip of the third tubular body 41. Thrombi formed in veins tend to form longer in the longitudinal direction of blood vessels than thrombi formed in arteries. Therefore, coating the outer peripheral surface of the third tubular body 41 with the lubricating coating 43 reduces friction on the outer peripheral surface of the third tubular body 41, which is very effective when passing the third tubular body 41 through a long venous thrombus.

[0048] The effective length of the third tubular body 41 is less than 1000 mm. This makes the support catheter 40 effective for treating deep veins, where the length from the access point to the lesion location is likely to be less than 1000 mm. The longer the effective length, the less maneuverable the support catheter 40 becomes, so it is desirable for the effective length to be as short as possible without causing any problems.

[0049] The catheter system 10 is used for passing through a lesion in a vein and includes a support catheter 40 (catheter), a lesion crossing catheter 30 insertable into the support catheter 40, a parent catheter 50 into which the support catheter 40 can be inserted, an inner catheter 20 insertable into the lesion crossing catheter 30, and an outer catheter 60 into which the parent catheter 50 can be inserted, with these tubular bodies (first tubular body 21, second tubular body 31, third tubular body 41, fourth tubular body 51, and fifth tubular body 61) coaxially overlapping from the inside to the outside in the order of the inner catheter 20, lesion crossing catheter 30, support catheter 40, parent catheter 50, and outer catheter 60. This allows the catheter system 10 to be adapted to the vein and to be pushed coaxially through the vein, thereby improving the passability of the lesion crossing catheter 30 and guidewire through a venous lesion.

[0050] The catheter system 10 is used for passing through a venous lesion and includes a support catheter 40 (catheter) having a long third tubular body 41 (tubular body) with an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less, a lesion crossing catheter 30 insertable into the third tubular body 41 of the support catheter 40, and a parent catheter 50 into which the support catheter 40 can be inserted. As a result, the catheter system 10 can satisfactorily support the lesion crossing catheter 30, which has an outer diameter with an upper outer diameter of approximately 1.4 mm and is considerably smaller than the inner diameter of the parent catheter 50, inside the parent catheter 50, which is adapted to a vein and has an inner diameter with a lower limit of approximately 2.8 mm. Therefore, the catheter system 10 can improve the passability of the lesion crossing catheter 30 through a venous lesion.

[0051] The catheter system 10 further includes an inner catheter 20 that can be inserted into the lesion crossing catheter 30, and an outer catheter 60 that can be inserted into the parent catheter 50. This allows the catheter system 10 to further improve the passability of the lesion crossing catheter 30 into a venous lesion.

[0052] The treatment method in this embodiment is a treatment method in which at least a portion of the catheter system 10 is passed through a venous lesion together with a guidewire, and the support catheter 40 (catheter) has a long third tubular body 41 (tubular body) having an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less. The third tubular body 41 of the support catheter 40 (catheter) is inserted into a parent catheter 50, and the lesion crossing catheter 30 is inserted into the third tubular body 41, and the catheter system 10 is passed through the venous lesion. This treatment method allows the lesion crossing catheter 30, which has an upper outer diameter of approximately 1.4 mm and is significantly smaller than the inner diameter of the parent catheter 50, to be well supported inside the parent catheter 50, which has an inner diameter of approximately 2.8 mm to accommodate the vein. Therefore, this treatment method can improve the passability of the lesion crossing catheter 30 through a venous lesion.

[0053] In the above treatment method, the venous lesion may be passed through using the catheter system 10 in which the parent catheter 50 is inserted into the outer catheter 60 and the inner catheter 20 is inserted into the lesion-crossing catheter 30. This further improves the passability of the lesion-crossing catheter 30 through the venous lesion.

[0054] The present invention is not limited to the above-described embodiments, and various modifications may be made by those skilled in the art within the technical spirit of the present invention. For example, the hub connected to the proximal end of the tubular body of each catheter may or may not be provided with a valve or port. Furthermore, a kink-resistant protector may be provided to cover the space between the tubular body and the hub of each catheter. [Explanation of symbols]

[0055] 10 Catheter System 20 Internal Catheter 21 First pipe 22 First Lumen 30 Lesion-Passing Catheter 31 Second pipe 32 second lumen 40 Support Catheter (Catheter) 41 Third pipe (pipe) 42 3rd lumen 43 Lubricating Coat 50 Parent catheter 51 Fourth pipe 52 4th lumen 60 External Catheter 61 5th pipe 62 5th lumen

Claims

1. A catheter having a long tubular body used for passing through a venous lesion, A catheter characterized in that the inner diameter of the tubular body is 1.4 mm or more and the outer diameter is 2.8 mm or less.

2. 2. The catheter according to claim 1, wherein the outer diameter of the tubular body is 2.0 mm or less.

3. 3. The catheter according to claim 1, wherein the outer peripheral surface of at least the distal end of the tubular body is coated with a lubricating coating.

4. 3. The catheter according to claim 1, wherein the effective length of the tubular body is less than 1000 mm.

5. 1. A catheter system for use in crossing a venous lesion, comprising: A catheter, a lesion-passing catheter that can be inserted into the catheter; a parent catheter into which the catheter can be inserted; an inner catheter that can be inserted into the lesion-passing catheter; and an outer catheter into which the parent catheter can be inserted, wherein, from the inside to the outside, these tubular bodies are coaxially stacked in the order of the inner catheter, the lesion-passing catheter, the catheter, the parent catheter, and the outer catheter.

6. 1. A catheter system for use in crossing a venous lesion, comprising: a catheter having a long tubular body with an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less; a lesion-passing catheter that can be inserted into the tubular body of the catheter; a parent catheter into which the catheter can be inserted.

7. an inner catheter that can be inserted into the lesion-passing catheter; The catheter system according to claim 6, further comprising an outer catheter into which the parent catheter can be inserted.

8. 1. A method of treatment comprising passing at least a portion of a catheter system over a guidewire through a venous lesion, the method comprising: A treatment method characterized by inserting a long tubular body of a catheter having an inner diameter of 1.4 mm or more and an outer diameter of 2.8 mm or less into a parent catheter, and passing the catheter through a venous lesion using a catheter system in which a lesion-passing catheter is inserted into the tubular body.

9. 9. The treatment method according to claim 8, wherein the vein is passed through a lesion using a catheter system in which the parent catheter is inserted into an outer catheter and the inner catheter is inserted into the lesion-passing catheter.

Images