Thrombus aspiration catheter

Abstract

The invention provides a thrombus aspiration catheter, and relates to the technical field of medical instruments. The catheter body is sequentially provided with a spiral part, a transition part and a smooth part from the far end to the near end. At least one first groove is formed in an inner cavity of the spiral part, the first groove is formed in the axial direction of the spiral part, and the first groove spirally rotates and extends, so that liquid passing through the spiral part rotates along the first groove, shearing stress and torsional stress are tested on thrombus entering the spiral part, and the thrombus is lengthened or broken. The spiral part is arranged at the far end of the catheter body, the thrombus is lengthened or torn through fluid shear force and torsional stress at the first groove of the inner cavity of the spiral part, the thrombus can stably pass through the catheter, and impact of the thrombus on the catheter body is reduced.

Description

Technical Field

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

[0002] Clinical studies have confirmed that thrombectomy is effective in the treatment of acute stroke and is one of the most effective treatments. The international medical field and professional medical guidelines of various countries clearly point out that for patients who meet the conditions for thrombectomy interventional treatment, interventional intracranial thrombus removal surgery should be performed immediately without delay.

[0003] Currently, the main thrombectomy methods are direct aspiration technique (ADAPT) and stent retriever (SR), both of which have shown good treatment effects in clinical practice and are widely recognized. However, studies have shown that direct aspiration technique (ADAPT) has more outstanding advantages than stent retriever (SR), which can achieve blood vessel recanalization at a faster speed, significantly shorten the surgical recanalization time, and is more economical in medical costs, reducing the economic burden on patients, bringing greater benefits and hope to the treatment of acute stroke patients.

[0004] In the prior art, the problem of large thrombus blocking the catheter is generally reduced by providing a spiral groove in the inner cavity of the suction catheter. By providing a spiral groove in the inner cavity of the suction catheter, liquid can flow along the spiral groove, forming a spiral liquid flow to drive the thrombus through, which can reduce the problem of large thrombus blocking the catheter. However, the thrombus in the spiral groove will impact the suction catheter, causing the suction catheter to compress and stimulate the blood vessel wall.

[0005] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a thrombus aspiration catheter to solve the problem that the thrombus impacts the catheter during the thrombus aspiration process, causing the aspiration catheter to compress and stimulate the blood vessel wall.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A thrombus aspiration catheter comprises a catheter body;

[0009] The catheter body is provided with a spiral section, a transition section and a smooth section in sequence from the distal end to the proximal end;

[0010] The inner cavity of the spiral section is provided with at least one first groove, the first groove is arranged around the axial direction of the spiral portion, the first groove extends in a spiral shape, and a secondary flow port connected to the distal end of the first groove is opened on the side wall of the catheter body, and the secondary flow port runs through the distal end of the catheter body;

[0011] The liquid passing through the spiral portion rotates along the first groove to apply shear stress and torsional stress to the thrombus entering the spiral portion, so that the thrombus is elongated or ruptured.

[0012] Preferably, the inner diameter of the smooth portion is larger than the inner diameter of the spiral portion, and the inner cavity surface of the smooth portion is smoothly arranged.

[0013] Preferably, the inner cavity of the transition portion is conical, and the angle θ between the inner cavity generatrix of the transition portion and the high line is 10 to 30°.

[0014] Preferably, the secondary flow port is provided with a plurality of openings, and the plurality of openings are distributed on the side wall and the end portion of the catheter body.

[0015] Preferably, the depth of the first groove is 0.2 mm to 0.4 mm, and the length of the spiral portion is 50 mm to 70 mm.

[0016] Preferably, the inner cavity of the transition portion is provided with a plurality of second grooves, the second grooves are connected to the spiral portion and the smooth portion, and the axis of the second groove is a straight line, so that the second groove is in a straight line shape.

[0017] Preferably, the second groove has a depth of 0.1 mm to 2.5 mm and a width of 0.1 mm to 5.0 mm.

[0018] Preferably, the depth of the second groove gradually increases from the distal end to the proximal end within the range of 0.1 mm to 2.5 mm, and the width gradually increases from the distal end to the proximal end within the range of 0.1 mm to 5.0 mm.

[0019] Preferably, the cross-sections of the first groove and the second groove may be rectangular, trapezoidal, semicircular, semi-elliptical, V-shaped or the like.

[0020] Preferably, the materials of the spiral portion, the transition portion and the smooth portion are independently selected from silicone or polyurethane.

[0021] Beneficial effects:

[0022] (1) The present invention provides a spiral portion at the distal end of the catheter body, and utilizes the fluid shear force and torsional stress at the first groove in the inner cavity of the spiral portion to stretch or tear the thrombus, thereby enabling the thrombus to pass stably and reducing the impact of the thrombus on the catheter body;

[0023] (2) The present invention provides a secondary flow port, which sucks liquid and directly enters the first groove, thereby increasing the amount of liquid flowing through the first groove and helping to increase the flow rate of the liquid in the first groove;

[0024] (3) The present invention provides a second groove in the inner cavity of the transition portion. The second groove is in a straight line shape, which can improve the stability of the thrombus when it passes through. When the thrombus moves along the second groove, the second groove can prevent the thrombus from directly impacting the inner wall of the transition portion, and will not cause the catheter body to compress and stimulate the blood vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0026] Figure 1 Main structural diagram of the suction catheter provided in Example 5 of the present invention

[0027] Figure 2 for Figure 1 Enlarged view of point A

[0028] Figure 3 A front view of the suction catheter provided by an embodiment of the present invention;

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0031] Figure 6 This is a main structural diagram of the transition portion in an embodiment of the present invention;

[0032] Figure 7 A front structural view and a right side view of the suction catheter provided in Example 1 of the present invention;

[0033] Figure 8 A front structural view and a right side view of the suction catheter provided in Example 2 of the present invention;

[0034] Fig. 9 A front structural view and a right side view of the suction catheter provided in Example 3 of the present invention;

[0035] Fig.10 This is a front structural diagram and a right side view of the suction catheter provided in Example 4 of the present invention.

[0036] In the figure: 100, catheter body; 101, secondary flow port; 200, spiral portion; 300, transition portion; 400, smooth portion; 201, first groove; 301, second groove. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0042] In the description of the present invention, the "distal end" refers to the end farther from the doctor during surgery, and the "proximal end" refers to the end closer to the doctor during surgery.

[0043] In the description of the present invention, "before use" refers to the state in which the thrombus aspiration catheter has not been used, has not entered the human body, or has not come into contact with body fluids such as blood, tissue fluid, etc. in the human body, and "during use" refers to the state in which the thrombus aspiration catheter has entered the human body or has come into contact with body fluids such as blood, tissue fluid, etc. in the human body.

[0044] In the description of the present invention, "in vivo environment" refers to the environment below the epidermis of the skin where body fluids exist, such as the dermis and subcutaneous tissue, or the inside of blood vessels and organs.

[0045] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0046] The present invention aims at the problem that in the prior art, a spiral groove is generally provided in the inner cavity of the suction catheter to reduce the blockage of the catheter by a large thrombus, but the thrombus in the spiral groove will impact the suction catheter, causing the suction catheter to compress and stimulate the blood vessel wall.

[0047] The present invention provides a thrombus aspiration catheter, referring to Figure 1-Figure 7 , comprising a catheter body 100, the proximal end of the catheter body 100 is connected to an operating handle, the operating handle is a commonly used operating handle in the art, and the distal end of the catheter body 100 is provided with a spiral portion 200, a transition portion 300 and a smooth portion 400 connected in sequence from far to near, wherein:

[0048] The inner cavity of the spiral portion 200 is provided with at least one (for example, 1, 2, 3, 4, 5) first grooves 201, and the first grooves 201 extend in a spiral shape around the axis of the spiral portion 200, so that the liquid flow passing through the spiral portion 200 rotates along the first grooves 201, and can exert shear stress and torsional stress on the thrombus entering the spiral portion 200, so that the thrombus is stretched or ruptured, which helps the thrombus to pass through the catheter body 100 smoothly;

[0049] A secondary flow port 101 is provided on the side wall of the catheter body 100 and is connected to the distal end of the first groove 201. The secondary flow port 101 passes through the distal end of the catheter body 100. One end of the secondary flow port 101 is connected to the first groove 201, and the other end is connected to the outside of the catheter body 100. During suction, negative pressure is also generated at the secondary flow port 101, and air and liquid are sucked into the secondary flow port 101, and then directly enter the first groove 201. The purpose of this setting is to allow liquid to pass stably at the first groove 201, ensure that shear stress and torsional stress are applied to the thrombus entering the spiral portion 200, and improve the shear efficiency of the thrombus.

[0050] The inner diameter of the smooth portion 400 is greater than that of the spiral portion 200, and has a smooth inner cavity surface to facilitate the rapid passage of thrombus. In order to prevent a sudden change in flow rate and avoid a drastic change in the movement posture of the thrombus when it enters the smooth portion 400 with a larger inner diameter from the spiral portion 200 with a smaller inner diameter and hits the inner wall of the catheter body 100, the inner diameter of the transition portion 300 gradually increases in the direction toward the smooth portion 400, making it funnel-shaped.

[0051] The secondary flow port 101 is provided with a plurality of openings, which are distributed on the side wall and the end of the catheter body 100 . By providing a plurality of openings, the opening area of ​​the secondary flow port 101 is increased, so that the secondary flow port 101 can stably absorb the flow and ensure the flow entering the first groove 201 .

[0052] Furthermore, if Figure 4 As shown, the inner cavity of the transition portion 300 is conical, and the angle θ between the inner cavity generatrix of the transition portion 300 and the high line is 10 to 30° (for example, 11°, 13°, 15°, 17°, 19°, 20°, 21°, 23°, 25°, 27°, 29°). If the angle is too small, the speed of the thrombus passing through will be affected, and if it is too large, the stability of the thrombus passing through will be reduced.

[0053] In a preferred embodiment of the present invention, multiple first grooves 201 (for example, 1, 2, 3, 4, or 5) can be arranged in the inner cavity of the spiral portion 200 to increase the shear stress and torsional stress applied to the thrombus. These first grooves 201 can be arranged equidistantly or unequally.

[0054] Specifically, the depth of the first groove 201 is 0.2mm~0.4mm (for example, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.29mm, 0.30mm, 0.31mm, 0.33mm, 0.35mm, 0.37mm, 0.39mm), and the width is 3.0mm~4.0mm (for example, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm). The depth and width of the first groove 201 can be a fixed value within the above range, or can be a gradually changing value within the above range. For example, the depth of the first groove 201 gradually deepens from the distal end to the proximal end in the range of 0.2mm~0.4mm, and the width gradually narrows from the distal end to the proximal end in the range of 3.0mm~4.0mm.

[0055] When the number of the first grooves 201 is greater than one, the depths and widths of the first grooves 201 may be the same or different.

[0056] The length of the spiral portion 200 is 50 to 70 mm (for example, 51 mm, 53 mm, 55 mm, 57 mm, 59 mm, 60 mm, 61 mm, 63 mm, 65 mm, 67 mm, 69 mm), and the pitch of the first groove 201 is 3 to 5 mm (for example, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4.0 mm, 4.1 mm, 4.3 mm, 4.5 mm, 4.7 mm, 4.9 mm).

[0057] The inner cavity of the transition portion 300 is provided with a plurality of (for example, 2, 3, 4, 5) second grooves 301, and the second groove 301 is connected to the spiral portion 200 and the smooth portion 400. The axis of the second groove 301 is a straight line, so that the second groove 301 is straight, which can improve the stability of the thrombus when passing through. When the thrombus moves along the second groove 301, the second groove 301 can prevent the thrombus from directly impacting the inner wall of the transition portion 300, and will not cause the catheter body 100 to compress and stimulate the blood vessel wall.

[0058] Specifically, the depth of the second groove 301 is 0.1mm~2.5mm (for example, 0.2mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.0mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm), and the width is 0.1mm~5.0mm (for example, 0.2mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 4.9mm). The depth and width of the second groove 301 can be a fixed value within the above range, or can be a gradually changing value within the above range. For example, the depth of the second groove 301 gradually deepens from the distal end to the proximal end in the range of 0.1mm~2.5mm, and the width gradually widens from the distal end to the proximal end in the range of 0.1mm~5.0mm.

[0059] In a preferred embodiment of the present invention, multiple second grooves 301 (for example, 2, 3, 4, or 5) can be provided in the inner cavity of the transition portion 300. These second grooves 301 are evenly or unevenly distributed around the axis of the transition portion 300, and the depth and width of each second groove 301 can be the same or different.

[0060] In a preferred embodiment of the present invention, the cross-sections of the first groove 201 and the second groove 301 can be rectangular, trapezoidal, semicircular, semi-elliptical, V-shaped, etc. The depth mentioned above refers to the distance between the geometric bottom of the first groove 201 and the inner cavity surface of the spiral portion 200, or the distance between the geometric bottom of the second groove 301 and the inner cavity surface of the transition portion 300.

[0061] In a preferred embodiment of the present invention, the outlet of the first groove 201 at the proximal end and the inlet of the second groove 301 at the distal end may be directly opposite to each other or may be offset from each other.

[0062] In a preferred embodiment of the present invention, the materials of the spiral portion 200, the transition portion 300 and the smooth portion 400 are independently selected from silicone or polyurethane, for example, the spiral portion 200, the transition portion 300 and the smooth portion 400 are all made of silicone, or the spiral portion 200 and the transition portion 300 are made of silicone, and the smooth portion 400 is made of polyurethane. Silicone and polyurethane are relatively soft and can reduce the stimulation to the blood vessel wall when in contact with the blood vessel wall. Other soft materials with similar effects can also be used as the materials of the spiral portion 200, the transition portion 300 and the smooth portion 400.

[0063] The thrombus aspiration catheter of the present invention is described in detail below through specific embodiments.

[0064] Example 1

[0065] like Figure 7 As shown, this embodiment provides a thrombus aspiration catheter, including a catheter body 100, the proximal end of the catheter body 100 is connected to an operating handle, and the distal end of the catheter body 100 is provided with a spiral portion 200, a transition portion 300 and a smooth portion 400 connected in sequence from far to near.

[0066] The length of the spiral portion 200 is 55 mm, and the inner cavity of the spiral portion 200 is provided with a first groove 201, which extends in a spiral shape around the axis of the spiral portion 200, so that the liquid flow passing through the spiral portion 200 can rotate along the first groove 201, and the depth and width of the first groove 201 remain fixed along its extension direction. Specifically, the depth of the first groove 201 is 0.2 mm and the width is 4.0 mm.

[0067] The inner diameter of the smooth portion 400 is greater than that of the spiral portion 200, and has a smooth inner cavity surface to facilitate the rapid passage of thrombus. The inner diameter of the transition portion 300 gradually increases in the direction toward the smooth portion 400, making it funnel-shaped. The inner cavity surface of the transition portion 300 is a conical surface, and the angle θ between its generatrix and the high line is 20°.

[0068] The inner cavity of the transition portion 300 is symmetrically provided with two second grooves 301, which connect the spiral portion 200 and the smooth portion 400. The second groove 301 is linear, and the depth and width of the second groove 301 remain fixed along its extension direction. Specifically, its depth is 0.1 mm and its width is 5.0 mm.

[0069] Example 2

[0070] like Figure 8 As shown, this embodiment provides a thrombus aspiration catheter, including a catheter body 100, the proximal end of the catheter body 100 is connected to an operating handle, and the distal end of the catheter body 100 is provided with a spiral portion 200, a transition portion 300 and a smooth portion 400 connected in sequence from far to near.

[0071] The length of the spiral portion 200 is 60 mm, and the inner cavity of the spiral portion 200 is provided with two first grooves 201. The first grooves 201 extend in a spiral shape around the axis of the spiral portion 200, so that the liquid flow passing through the spiral portion 200 can rotate along the first grooves 201. The depth and width of the first grooves 201 remain fixed along the extension direction thereof. Specifically, the depth of the two first grooves 201 is 0.25 mm and the width is 3.5 mm.

[0072] The inner diameter of the smooth portion 400 is greater than that of the spiral portion 200, and has a smooth inner cavity surface to facilitate the rapid passage of thrombus. The inner diameter of the transition portion 300 gradually increases in the direction toward the smooth portion 400, making it funnel-shaped. The inner cavity surface of the transition portion 300 is a conical surface, and the angle θ between its generatrix and the high line is 20°.

[0073] The inner cavity of the transition portion 300 is evenly provided with two second grooves 301, which connect the spiral portion 200 and the smooth portion 400. The second groove 301 is linear, and the depth and width of the second groove 301 remain fixed along its extension direction. Specifically, its depth is 1.0 mm and its width is 3.0 mm.

[0074] Example 3

[0075] like Fig. 9 As shown, this embodiment provides a thrombus aspiration catheter, including a catheter body 100, the proximal end of the catheter body 100 is connected to an operating handle, and the distal end of the catheter body 100 is provided with a spiral portion 200, a transition portion 300 and a smooth portion 400 connected in sequence from far to near.

[0076] The length of the spiral portion 200 is 65 mm. The inner cavity of the spiral portion 200 is provided with three equidistantly arranged first grooves 201. The first grooves 201 extend in a spiral shape around the axis of the spiral portion 200, so that the liquid flow passing through the spiral portion 200 can rotate along the first grooves 201. The depth and width of the first grooves 201 remain fixed along the extension direction thereof. Specifically, from the distal end to the proximal end of the spiral portion 200, the depths of the three first grooves 201 are 0.2 mm, 0.3 mm and 0.4 mm, respectively, and the widths are 3.0 mm, 3.5 mm and 4.0 mm, respectively.

[0077] The inner diameter of the smooth portion 400 is greater than that of the spiral portion 200, and has a smooth inner cavity surface to facilitate the rapid passage of thrombus. The inner diameter of the transition portion 300 gradually increases in the direction toward the smooth portion 400, making it funnel-shaped. The inner cavity surface of the transition portion 300 is a conical surface, and the angle θ between its generatrix and the high line is 15°.

[0078] The inner cavity of the transition portion 300 is evenly provided with four second grooves 301, which connect the spiral portion 200 and the smooth portion 400. The second grooves 301 are straight, and the depth and width of the second grooves 301 remain fixed along their extension direction. Specifically, the depth of the four second grooves 301 is 1.0 mm, and the width is 2.0 mm.

[0079] Example 4

[0080] like Fig.10 As shown, this embodiment provides a thrombus aspiration catheter, including a catheter body 100, the proximal end of the catheter body 100 is connected to an operating handle, and the distal end of the catheter body 100 is provided with a spiral portion 200, a transition portion 300 and a smooth portion 400 connected in sequence from far to near.

[0081] The length of the spiral portion 200 is 70 mm, and the inner cavity of the spiral portion 200 is provided with three first grooves 201 arranged at unequal intervals. The first grooves 201 extend in a spiral shape around the axis of the spiral portion 200, so that the liquid flow passing through the spiral portion 200 can rotate along the first grooves 201. The depth and width of the first grooves 201 gradually change along the extension direction thereof. Specifically, along the distal end to the proximal end direction of the spiral portion 200, the depth of the three first grooves 201 gradually deepens from the distal end to the proximal end within the range of 0.2 mm to 0.4 mm, and the width gradually narrows from the distal end to the proximal end within the range of 3.0 mm to 4.0 mm, that is, the depth of the first groove 201 at the distal entrance is 0.2 mm, and the width is 4.0 mm, and the depth of the proximal exit is 0.4 mm, and the width is 3.0 mm. Through this arrangement, the blood flow can be accelerated and the ability of thrombus to pass through the spiral portion 200 can be improved.

[0082] The inner diameter of the smooth portion 400 is greater than that of the spiral portion 200, and has a smooth inner cavity surface to facilitate the rapid passage of thrombus. The inner diameter of the transition portion 300 gradually increases in the direction toward the smooth portion 400, making it funnel-shaped. The inner cavity surface of the transition portion 300 is a conical surface, and the angle θ between its generatrix and the high line is 15°.

[0083] The inner cavity of the transition portion 300 is evenly provided with 6 second grooves 301, and the second grooves 301 connect the spiral portion 200 and the smooth portion 400. The second grooves 301 are straight, and the depth and width of the second grooves 301 gradually change along the extension direction thereof. Specifically, the depth of the second groove 301 gradually deepens from the distal end to the proximal end in the range of 0.4 mm to 2.5 mm, and the width gradually widens from the distal end to the proximal end in the range of 3.0 mm to 5.0 mm, that is, the depth of the distal entrance of the second groove 301 is 0.4 mm, and the width is 3.0 mm, and the depth of the proximal exit is 2.5 mm, and the width is 5.0 mm. Through this arrangement, the blood flow rate in the second groove 301 can be reduced, and the impact of thrombus on the inner wall of the transition portion 300 can be reduced.

[0084] Example 5

[0085] like Figure 1 and Figure 2 As shown, a secondary flow port 101 is provided on the side wall of the catheter body 100, one end of the secondary flow port 101 passes through the distal end of the catheter body 100 and communicates with the outside, and the other end communicates with the first groove 201. During suction, negative pressure is also generated at the secondary flow port 101, and liquid is sucked into the secondary flow port 101 and then directly enters the first groove 201. Allowing liquid to stably pass through the first groove 201 ensures that shear stress and torsional stress are applied to the thrombus entering the spiral portion 200, thereby improving the shearing efficiency of the thrombus.

[0086] Preferably, the secondary flow port is provided with a plurality of openings, and the plurality of openings are distributed on the side wall and the end of the conduit body. By providing a plurality of openings, the opening area of ​​the secondary flow port is increased, and the secondary flow port can stably absorb the flow, thereby ensuring the flow entering the first groove 201 .

[0087] In summary: the present invention utilizes the spiral portion 200 to apply shear stress and torsional stress to the thrombus, so that the thrombus is stretched or torn, and a transition portion 300 is provided at the proximal end of the spiral portion 200, which can play a buffering and transition role, and reduce the impact of the thrombus on the catheter body 100, and a smooth portion 400 is provided at the distal end of the transition portion 300, and its inner cavity surface is smooth, which is conducive to the rapid passage of the thrombus, thereby solving the problem of the thrombus impacting the catheter during the thrombus extraction process, causing the suction catheter to compress and stimulate the blood vessel wall.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thrombus aspiration catheter, characterized in that: including a catheter body; The catheter body is provided with a spiral section, a transition section and a smooth section in sequence from the distal end to the proximal end; The inner cavity of the spiral section is provided with at least one first groove, the first groove is arranged around the axial direction of the spiral portion, the first groove extends in a spiral shape, and a secondary flow port connected to the distal end of the first groove is opened on the side wall of the catheter body, and the secondary flow port runs through the distal end of the catheter body; The liquid passing through the spiral portion rotates along the first groove to apply shear stress and torsional stress to the thrombus entering the spiral portion, so that the thrombus is elongated or ruptured.

2. A thrombus aspiration catheter according to claim 1, characterized in that: The inner diameter of the smooth portion is greater than the inner diameter of the spiral portion, and the inner cavity surface of the smooth portion is smoothly arranged.

3. A thrombus aspiration catheter according to claim 1, characterized in that: The inner cavity of the transition part is conical, and the included angle θ between the inner cavity generatrix of the transition part and the high line is 10-30°.

4. A thrombus aspiration catheter according to any one of claims 1 to 3, characterized in that: The secondary flow port is provided with a plurality of openings, and the plurality of openings are distributed on the side wall and the end of the catheter body.

5. A thrombus aspiration catheter according to claim 4, characterized in that: The depth of the first groove is 0.2 mm to 0.4 mm, and the length of the spiral portion is 50 mm to 70 mm.

6. The thrombus aspiration catheter according to claim 1, characterized in that: The inner cavity of the transition part is provided with a plurality of second grooves, the second grooves are connected to the spiral part and the smooth part, and the axis of the second groove is a straight line, so that the second groove is in a straight line shape.

7. A thrombus aspiration catheter according to claim 6, characterized in that: The second groove has a depth of 0.1 mm to 2.5 mm and a width of 0.1 mm to 5.0 mm.

8. The thrombus aspiration catheter according to claim 7, characterized in that: The depth of the second groove gradually increases from the distal end to the proximal end within the range of 0.1 mm to 2.5 mm, and the width gradually increases from the distal end to the proximal end within the range of 0.1 mm to 5.0 mm.

9. The thrombus aspiration catheter according to claim 7, characterized in that: The cross-sections of the first groove and the second groove may be rectangular, trapezoidal, semicircular, semi-elliptical, V-shaped or the like.

10. A thrombus aspiration catheter according to any one of claims 1 to 8, characterized in that: The materials of the spiral portion, the transition portion and the smooth portion are independently selected from silicone or polyurethane.

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