A cutting catheter

Abstract

The present invention relates to a cutting catheter, which includes an inner core tube, an intermediate tube, a balloon, a cutter, and an outer tube. The cutting catheter of the present invention can be inserted into a target blood vessel under the guidance of a guide wire, and the balloon is expanded by injecting pressure into the balloon. As the balloon gradually expands, the squeezing force of the outer tube on the base gradually increases, and the sheath gradually deforms, so that the blade gradually extends from the sheath and the opening to the outside of the outer tube. In the process of the blade extending, the hard plaque in the blood vessel is cut and broken. For hard plaques that are more difficult to cut, the blade can be rotated or repeatedly extended and retracted to perform repeated back and forth cutting. While cutting, the broken plaque fragments are extracted and discharged from the body through a suction pipe. The length of the blade extension is controlled by controlling the radial expansion size of the balloon, and the blade is further limited by the knife groove on the outer tube to ensure stability during the cutting operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a cutting catheter. Background Art

[0002] Atherosclerotic plaques are common in vascular interventional therapy, leading to vascular stenosis and even blockage, severely impacting blood flow and endangering patients' lives. Currently, commonly used treatments include medication, balloon angioplasty, and stent implantation, but these methods are limited in their effectiveness in treating hard plaques and are prone to restenosis and other complications. Therefore, the development of a new cutting catheter that can efficiently fragment and remove hard plaques within blood vessels is of great clinical significance. Summary of the Invention

[0003] The purpose of the present invention is to provide a novel cutting catheter which has better cutting and clearing effects on atherosclerotic plaques, especially hard plaques.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The present invention provides a cutting catheter, comprising:

[0006] An inner core tube, wherein the inner core tube is provided with a guide wire channel extending from a proximal end to a distal end thereof for passing a guide wire;

[0007] An intermediate tube, the intermediate tube being sleeved on the outside of the inner core tube;

[0008] A balloon having a radially expanded state and a radially contracted state, wherein the balloon is sleeved on the outside of the distal end of the inner core tube, the proximal end of the balloon is sealed and fixedly connected to the distal end of the intermediate tube, and the distal end of the balloon is sealed and fixedly connected to the distal end of the inner core tube, and a balloon filling channel is formed between the inner core tube and the intermediate tube and is connected to the interior of the balloon for conveying gas and / or liquid into the balloon;

[0009] a cutter, the cutter comprising a base and a blade, the base comprising a base body fixedly disposed on the outer surface of the balloon and a sheath portion fixedly connected to or integrally formed with the base body, the base body having a harderness than the sheath portion, the opening of the sheath portion facing the outside of the balloon, and the blade being inserted into the sheath portion;

[0010] An outer tube, the outer tube is sleeved on the outside of the intermediate tube, the balloon and the cutter, the distal end of the outer tube is sealed and fixedly connected to the distal end of the inner core tube and / or the distal end of the balloon, the distal end of the outer tube is provided with a knife groove and a suction port, the knife groove is aligned with the opening of the sheath, and a suction channel connected to the suction port is formed between the outer tube and the intermediate tube,

[0011] When the balloon is in a radially contracted state, the blade is housed in the sheath.

[0012] When the balloon switches from a radially contracted state to a radially expanded state, the surface of the opening of the sheath is always in close contact with the inner wall of the outer tube. As the balloon gradually expands, the squeezing force of the outer tube on the base gradually increases, and the sheath gradually deforms, so that the blade gradually extends from the sheath and the opening to the outside of the outer tube.

[0013] When the balloon switches from a radially expanded state to a radially contracted state, the surface of the sheath portion where the opening is located is always in close contact with the inner wall of the outer tube. As the balloon gradually contracts, the squeezing force of the outer tube on the base gradually decreases, and the sheath portion gradually recovers its deformation, so that the blade gradually retracts from the outside of the outer tube into the sheath portion.

[0014] According to some embodiments of the present invention, the base, the blade and the knife groove extend in directions parallel to the axis of the intermediate tube respectively, a plurality of the knives are arranged at intervals along the circumference of the balloon, and a plurality of the knife grooves are arranged at corresponding intervals along the circumference of the outer tube.

[0015] According to some embodiments of the present invention, the projection of the base on the cross section is roughly an hourglass shape consisting of two hollow triangles, and the projection of the sheath on the cross section is a hollow triangle of the hourglass shape away from the intermediate tube.

[0016] Furthermore, when the balloon is in a radially contracted state, the projection of the sheath portion on the cross section is an acute-angled triangle, and when the balloon is in a radially expanded state, the projection of the sheath portion on the cross section is an obtuse-angled triangle.

[0017] Furthermore, the thickness of the blade gradually decreases from the balloon surface to the outside along the radial direction of the balloon. The cross-section of the blade is trapezoidal, and the bottom surface is fixed to the bottom of the sheath by glue and embedded clamping. The lower surface of the base is bonded to the outer surface of the balloon by glue. Since the silicone material has a certain flexibility, glue can also be used to fix part of the upper surface of the sheath to the inner wall of the outer tube to ensure that the surface of the sheath is always close to the inner wall of the outer tube, ensuring that the opening of the sheath is always aligned with the knife groove.

[0018] According to some embodiments of the present invention, the base is made of silicone.

[0019] According to some embodiments of the present invention, the inner core tube, the intermediate tube, and the outer tube are respectively made of modified or unmodified polyamide resin.

[0020] According to some embodiments of the present invention, the blade is made of stainless steel or titanium alloy.

[0021] According to some embodiments of the present invention, the surface of the blade is provided with a developing coating, for example, a barium sulfate coating is provided on the surface of the blade, so that the blade can be developed under X-rays.

[0022] The blade in the cutting catheter of this invention maintains both mechanical properties and imaging capabilities, ensuring visibility during surgery. The coating process can utilize electrophoretic coating. Barium sulfate powder and a binder are dissolved in water to form an electrophoretic coating solution. The blade, acting as the cathode, is placed in the electrophoretic coating solution. An electric current is passed through the solution, causing the barium sulfate particles to evenly deposit on the blade surface. This method produces a uniform coating with strong adhesion.

[0023] According to some embodiments of the present invention, a plurality of the suction ports are spaced apart along the axial direction and the circumferential direction of the outer tube.

[0024] According to some embodiments of the present invention, the outer tube includes an outer tube main body section, a suction section fixedly connected to or integrally formed with the distal end of the outer tube main body section, and a cutting section fixedly connected to or integrally formed with the distal end of the suction section, an annular retaining portion for separating the interior of the suction section and the cutting section is provided between the suction section and / or the cutting section and the proximal end of the intermediate tube and / or the balloon, the suction channel extends from the proximal end of the outer tube main body section to the distal end of the suction channel, the knife groove is opened on the cutting section, and the suction port is opened on the suction section.

[0025] Furthermore, the lengths of the suction section and the cutting section are independently 5% to 10% of the total length of the outer tube.

[0026] Preferably, the cutting catheter also includes a catheter seat fixedly arranged at the proximal ends of the inner core tube, the intermediate tube and the outer tube, and the catheter seat is provided with a first channel with a first entrance and exit connected to the proximal end of the guidewire channel, a second channel with a second entrance and exit connected to the balloon filling channel, and a third channel with a third entrance and exit connected to the suction channel.

[0027] The present invention also provides a thrombus cutting system, which includes the above-mentioned cutting catheter, a guide wire, an air or liquid filling device and a negative pressure extraction device.

[0028] The cutting catheter of the present invention can be inserted into the target blood vessel under the guidance of a guidewire. The balloon is inflated by injecting pressure into it. As the balloon gradually expands, the squeezing force of the outer tube on the base gradually increases, and the sheath gradually deforms, causing the blade to gradually extend from the sheath and opening to the outside of the outer tube. During the blade extension process, the hard plaque within the blood vessel is cut and fragmented. For hard plaques that are more difficult to cut, the blade can be rotated or repeatedly extended and retracted to perform repeated cutting back and forth. Simultaneously, the fragmented plaque fragments are extracted and discharged from the body through a suction tube. The length of the blade extension is controlled by controlling the radial expansion size of the balloon, and the blade is further limited by a blade groove on the outer tube to ensure stability during the cutting operation.

[0029] Currently, when breaking up intravascular plaques, the hardness and uneven distribution of the plaques often result in poor breaking effects. The cutting catheter of the present invention drives the blades to extend evenly through balloon inflation, ensuring a consistent plaque breaking effect and effectively solving the problem of uneven plaque breaking effects.

[0030] After the plaque is broken, failure to remove the plaque fragments in time may cause the blood vessels to be blocked again. The cutting catheter of the present invention uses the suction port and suction channel set at the proximal end of the knife groove to remove the plaque fragments in time through negative pressure suction, thereby improving the removal efficiency and effectively solving the problem of incomplete removal of plaque fragments.

[0031] Furthermore, the cutting catheter of the present invention is made of appropriate materials and has a structural design to enhance the stability and flexibility of the cutting catheter so that it can be smoothly operated in narrow and tortuous blood vessels.

[0032] Furthermore, the cutting catheter of the present invention realizes the visible and invisible function of the blade by optimizing the blade material and structural design. The blade needs to be able to be freely visible and invisible during operation, and at the same time, the blade has high wear resistance to ensure reliability in long-term use.

[0033] The cutting catheter of the present invention is suitable for the following clinical applications:

[0034] Breakup and removal of hard plaques in blood vessels: used to treat vascular stenosis and occlusion caused by atherosclerosis.

[0035] Minimally invasive endovascular surgery: applicable to cardiovascular interventional surgery and peripheral vascular interventional surgery.

[0036] Other interventional treatments: Applicable to other interventional treatments that require the fragmentation and removal of diseased tissue through a catheter.

[0037] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0038] The cutting catheter of this invention can effectively break up and remove hard plaque within blood vessels, reducing the risk of vascular blockage and improving the success rate and safety of interventional treatments. By controlling the repeated extension and retraction of the blade through the expansion and contraction of the balloon, precise plaque breakage and removal is achieved, minimizing damage to the vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] It should be noted that in order to fully display the structure in the drawings, the proportional relationship in the drawings has been adaptively adjusted, but it does not represent the proportional relationship of the structures of the various parts in actual use, or the proportional relationship in the drawings as a factor in limiting the scope of protection of the present invention.

[0041] Figure 1 This is a schematic diagram of the overall structure of the cutting catheter of Example 1;

[0042] Figure 2 Schematic diagram of the overall structure of the cutting catheter of Example 1 (the outer tube main body section is omitted);

[0043] Figure 3 Schematic diagram of the distal end structure of the cutting catheter of Example 1;

[0044] Figure 4 Schematic diagram of the structure of the distal end portion of the cutting catheter of Example 1 from another perspective;

[0045] Figure 5 is a partial cross-sectional view of the cutting catheter of Example 1 when the balloon is in a radially contracted state;

[0046] Figure 6 is a partial cross-sectional view of the cutting catheter of Example 1 when the balloon is in a radially expanded state;

[0047] Figure 7 Schematic diagram of the proximal end portion of the cutting catheter of Example 1;

[0048] Figure 8 Schematic diagram of the cross-sectional structure of the proximal end portion of the cutting catheter of Example 1,

[0049] In the above figure: 1. inner core tube; 2. intermediate tube; 3. balloon; 41. base; 411. base body; 412. sheath; 42. blade; 5. outer tube; 51. outer tube main section; 52. suction section; 521. suction port; 53. cutting section; 531. knife groove; 54. annular baffle; 6. catheter seat; 61. first channel; 62. second channel; 63. third channel; 7. guide wire. DETAILED DESCRIPTION

[0050] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0051] In the description of the present invention, it should be understood that the distal end refers to the end of the instrument or component away from the operator, and the proximal end refers to the end of the instrument or component close to the operator; the axial direction refers to the direction parallel to the line connecting the distal and proximal centers of the instrument or component, and the radial direction refers to the direction perpendicular to the axial direction; the inner and outer are positions defined by the distance relative to the center of the instrument or component, where the inner position is close to the center of the instrument or component, and the outer position is far from the center of the instrument or component. The description of the above-mentioned directional words is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0052] In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0053] In the description of the present invention, a plurality refers to two or more.

[0054] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0055] Example 1

[0056] This embodiment is a preferred embodiment of the cutting catheter of the present invention. Figures 1 to 8 As shown, the cutting catheter of this embodiment includes an inner core tube 1, an intermediate tube 2, a balloon 3, a cutter, an outer tube 5 and a catheter seat 6.

[0057] Specifically, the inner core tube 1 is provided with a guide wire channel extending from its proximal end to its distal end for the guide wire to pass through.

[0058] Specifically, the middle tube 2 is sleeved on the outside of the inner core tube 1 .

[0059] Specifically, the balloon 3 has a radially expanded state and a radially contracted state. The balloon 3 is sleeved on the outside of the distal end of the inner core tube 1. The proximal end of the balloon 3 is sealed and fixedly connected to the distal end of the intermediate tube 2. The distal end of the balloon 3 is sealed and fixedly connected to the distal end of the inner core tube 1. A balloon filling channel is formed between the inner core tube 1 and the intermediate tube 2, which is connected to the interior of the balloon 3 and is used to transport gas and / or liquid into the balloon 3.

[0060] Specifically, the cutting tool comprises a base 41 and blades 42. The base 41 comprises a base body 411 fixedly mounted on the outer surface of the balloon 3 and a sheath 412 fixedly connected to or integrally formed with the base body 411. The base body 411 is harder than the sheath 412, and the opening of the sheath 412 faces the exterior of the balloon 3. The blades 42 are inserted into the sheath 412. The base 41 and blades 42 extend parallel to the axis of the intermediate tube 2, respectively. Multiple cutting tools are arranged at intervals along the circumference of the balloon 3. The cross-sectional projection of the base 41 is roughly an hourglass shape consisting of two hollow triangles. The cross-sectional projection of the sheath 412 is an hourglass-shaped hollow triangle facing away from the intermediate tube 2. When the balloon 3 is in a radially contracted state, the cross-sectional projection of the sheath 412 is an acute-angled triangle. When the balloon 3 is in a radially expanded state, the cross-sectional projection of the sheath 412 is an obtuse-angled triangle. The thickness of the blade 42 gradually decreases from the surface of the balloon 3 to the outside along the radial direction of the balloon 3. The cross-section of the blade 42 is trapezoidal, and the bottom surface is fixed to the bottom of the sheath 412 by glue and embedded clamping. The lower surface of the base 41 is bonded to the outer surface of the balloon 3 by glue.

[0061] Specifically, the outer tube 5 is sleeved on the outside of the middle tube 2, the balloon 3 and the cutter. The distal end of the outer tube 5 is sealed and fixedly connected to the distal end of the inner core tube 1 and the distal end of the balloon 3. The distal end of the outer tube 5 is provided with a knife groove 531 and a suction port 521. The knife groove 531 is aligned with the opening of the sheath 412. A suction channel connected to the suction port 521 is formed between the outer tube 5 and the middle tube 2. In this embodiment, the outer tube 5 includes an outer tube main section 51, a suction section 52 fixedly connected to the distal end of the outer tube main section 51 by welding, and a cutting section 53 fixedly connected to the distal end of the suction section 52 by welding. An annular retaining portion 54 is provided between the suction section 52 and the cutting section 53 and the proximal ends of the intermediate tube 2 and the balloon 3 to separate the interiors of the suction section 52 and the cutting section 53. The suction channel extends from the proximal end of the outer tube main section 51 to the distal end of the suction channel. A knife groove 531 is defined in the cutting section 53, and a suction port 521 is defined in the suction section 52. In this embodiment, a plurality of knife grooves 531 are provided at corresponding intervals along the circumference of the outer tube 5. The knife grooves 531 extend in a direction parallel to the axis of the intermediate tube 2. A plurality of suction ports 521 are provided at intervals along the axial and circumferential directions of the outer tube 5.

[0062] In this embodiment, the blade 42 is made of stainless steel and has a barium sulfate coating on its surface, allowing it to be visualized under X-rays. The base 41 is made of silicone. Because silicone is somewhat flexible, glue is used to securely connect the upper surface of the sheath 412 to the inner wall of the outer tube 5, ensuring that the surface of the sheath 412 is always in close contact with the inner wall of the outer tube 5 and that the opening of the sheath 412 is always aligned with the slit 531 on the outer tube 5. The intermediate tube 2, outer tube 5, and annular retaining portion 54 are each made of nylon, while the inner core tube 1 and balloon 3 are made of modified nylon (PEBAX). They are assembled together by laser welding, but can also be connected using other methods such as gluing.

[0063] Specifically, the catheter seat 6 is fixedly arranged at the proximal ends of the inner core tube 1, the intermediate tube 2 and the outer tube 5. The catheter seat 6 is provided with a first channel 61 with a first entrance and exit connected to the proximal end of the guidewire channel, a second channel 62 with a second entrance and exit connected to the balloon filling channel, and a third channel 63 with a third entrance and exit connected to the suction channel.

[0064] In this embodiment, the total length of the outer tube 5 is 1.2 m, and the lengths of the suction section 52 and the cutting section 53 are respectively 5% of the total length of the outer tube 5 . In other embodiments, the above dimensions can be adjusted according to actual needs.

[0065] In this embodiment, when the balloon 3 is in a radially contracted state, the blade 42 is housed in the sheath 412. When the balloon 3 is converted from a radially contracted state to a radially expanded state, the surface of the opening of the sheath 412 is always in close contact with the inner wall of the outer tube 5. As the balloon 3 gradually expands, the squeezing pressure of the outer tube 5 on the base 41 gradually increases, and the sheath 412 gradually deforms, causing the blade 42 to gradually extend from the sheath 411 and the opening to the outside of the outer tube 5. When the balloon 3 is converted from an expanded state to a radially contracted state, the surface of the opening of the sheath 411 is always in close contact with the inner wall of the outer tube 5. As the balloon 3 gradually contracts, the squeezing pressure of the outer tube 5 on the base 41 gradually decreases, and the sheath 411 gradually recovers its deformation, causing the blade 42 to gradually retract from the outside of the outer tube 5 into the sheath 411.

[0066] Example 2

[0067] This embodiment provides a thrombus cutting system, which includes the cutting catheter of Example 1, a guidewire, an air or liquid filling device, and a negative pressure pumping device, wherein the air or liquid filling device can be connected to the second channel via a Luer connector, and the negative pressure pumping device can be connected to the third channel via a Luer connector. Under the guidance of the guidewire, the cutting catheter can be inserted into the target blood vessel. The air or liquid filling device is used to inject and pressurize the balloon 3 to expand the balloon 3. As the balloon 3 gradually expands, the squeezing force of the outer tube 5 on the base 41 gradually increases, and the sheath 411 gradually deforms, causing the blade 42 to gradually extend from the sheath 411 and the opening to the outside of the outer tube 5. During the extension of the blade 42, the hard plaque in the blood vessel is cut and broken. For hard plaques that are more difficult to cut, the blade 42 can be rotated or repeatedly extended and retracted to perform repeated cutting back and forth. During the cutting, the broken plaque fragments are extracted and discharged from the body by the negative pressure pumping device. The extended length of the blade 42 is controlled by controlling the radial expansion size of the balloon 3 , and the blade 42 is further limited by the knife groove 531 on the outer tube 5 to ensure stability during the cutting operation.

[0068] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cutting catheter, characterized in that: The cutting catheter comprises: An inner core tube (1), wherein the inner core tube (1) is provided with a guide wire channel extending from its proximal end to its distal end for the passage of a guide wire; An intermediate tube (2), the intermediate tube (2) being sleeved on the outside of the inner core tube (1); A balloon (3), wherein the balloon (3) has a radially expanded state and a radially contracted state, the balloon (3) is sleeved on the outside of the distal end of the inner core tube (1), the proximal end of the balloon (3) is sealed and fixedly connected to the distal end of the intermediate tube (2), the distal end of the balloon (3) is sealed and fixedly connected to the distal end of the inner core tube (1), and a balloon filling channel is formed between the inner core tube (1) and the intermediate tube (2) and is connected to the interior of the balloon (3) for conveying gas and / or liquid into the balloon (3); A cutting tool, comprising a base (41) and a blade (42), wherein the base (41) comprises a base body (411) fixedly arranged on the outer surface of the balloon (3) and a sheath (411) fixedly connected to or integrally formed with the base body (411), wherein the hardness of the base body (411) is greater than that of the sheath (412), an opening of the sheath (412) faces the outside of the balloon (3), and the blade (42) is inserted into the sheath (412); An outer tube (5), the outer tube (5) is sleeved on the outside of the intermediate tube (2), the balloon (3) and the cutter, the distal end of the outer tube (5) is sealed and fixedly connected to the distal end of the inner core tube (1) and / or the distal end of the balloon (3), the distal end of the outer tube (5) is provided with a knife groove (531) and a suction port (521), the knife groove (531) is aligned with the opening of the sheath (412), and a suction channel connected to the suction port (521) is formed between the outer tube (5) and the intermediate tube (2). When the balloon (3) is in a radially contracted state, the blade (42) is housed in the sheath (412). When the balloon (3) switches from a radially contracted state to a radially expanded state, the surface of the opening of the sheath (412) is always in close contact with the inner wall of the outer tube (5). As the balloon (3) gradually expands, the squeezing force of the outer tube (5) on the base (41) gradually increases, and the sheath (412) gradually deforms, so that the blade (42) gradually extends from the sheath (412) and the opening to the outside of the outer tube (5). When the balloon (3) switches from a radially expanded state to a radially contracted state, the surface of the opening of the sheath (412) always closely contacts the inner wall of the outer tube (5). As the balloon (3) gradually contracts, the squeezing force of the outer tube (5) on the base (41) gradually decreases, and the sheath (412) gradually recovers its deformation, so that the blade (42) gradually retreats from the outside of the outer tube (5) into the sheath (412).

2. The cutting catheter according to claim 1, characterized in that The base (41), the blade (42) and the knife groove (531) respectively extend in a direction parallel to the axis of the intermediate tube (2); a plurality of the knives are arranged at intervals along the circumference of the balloon (3); and a plurality of the knife grooves (531) are arranged at corresponding intervals along the circumference of the outer tube (5).

3. The cutting catheter according to claim 1, characterized in that The projection of the base (41) on the cross section is roughly an hourglass shape consisting of two hollow triangles, and the projection of the sheath (412) on the cross section is a hollow triangle of the hourglass shape away from the intermediate tube (2).

4. The cutting catheter according to claim 3, characterized in that When the balloon (3) is in a radially contracted state, the projection of the sheath portion (412) on the cross section is an acute triangle, and when the balloon (3) is in a radially expanded state, the projection of the sheath portion (412) on the cross section is an obtuse triangle.

5. The cutting catheter according to claim 1, wherein: The base (41) is made of silicone; and / or the inner core tube (1), the intermediate tube (2) and the outer tube (5) are respectively made of modified or unmodified polyamide resin; and / or the blade (42) is made of stainless steel or titanium alloy; and / or the surface of the blade (42) is provided with a developing coating.

6. The cutting catheter according to claim 1, characterized in that A plurality of suction ports (521) are arranged at intervals along the axial direction and the circumferential direction of the outer tube (5).

7. The cutting catheter according to claim 1, characterized in that The outer tube (5) comprises an outer tube main section (51), a suction section (52) fixedly connected to or integrally formed with the distal end of the outer tube main section (51), and a cutting section (53) fixedly connected to or integrally formed with the distal end of the suction section (52). An annular retaining portion (54) for separating the interior of the suction section (52) and the cutting section (53) is provided between the suction section (52) and / or the cutting section (53) and the proximal end of the intermediate tube (2) and / or the balloon (3). The suction channel extends from the proximal end of the outer tube main section (51) to the distal end of the suction channel. The knife groove (531) is provided on the cutting section (53), and the suction port (521) is provided on the suction section (52).

8. The cutting catheter according to claim 7, characterized in that The lengths of the suction section (52) and the cutting section (53) are independently 5% to 10% of the total length of the outer tube (5).

9. The cutting catheter according to claim 1, characterized in that The cutting catheter further comprises a catheter seat (6) fixedly arranged at the proximal ends of the inner core tube (1), the intermediate tube (2) and the outer tube (5), wherein the catheter seat (6) is provided with a first channel (61) having a first inlet and outlet connected to the proximal end of the guidewire channel, a second channel (62) having a second inlet and outlet connected to the balloon filling channel, and a third channel (63) having a third inlet and outlet connected to the suction channel.

10. A thrombus cutting system, characterized in that: The invention comprises the cutting catheter, guide wire, air-filling or liquid-filling device and negative pressure extraction device according to any one of claims 1 to 9.

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