Aspiration catheter

Abstract

The application belongs to the technical field of medical devices, and provides a suction catheter. The suction catheter comprises a proximal end part and a distal end part arranged on one side of the proximal end part, the distal end part comprises a guide assembly and a steering assembly, the steering assembly is arranged between the guide assembly and the proximal end part, the guide assembly comprises a guide outer tube, the steering assembly comprises a steering outer tube, the guide outer tube is in communication with the steering outer tube, the elastic modulus of the guide outer tube is greater than the elastic modulus of the steering outer tube, and the proximal end part is provided with a proximal end channel in communication with the steering outer tube. By adopting the suction catheter, the distal end part of the suction catheter can smoothly pass through the blood vessel bifurcation, the damage of the distal end part of the suction catheter to the inner wall of the blood vessel is reduced, and the recovery of the patient is facilitated.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and more specifically, relates to an aspiration catheter. Background Technology

[0002] Stroke, commonly known as "apoplexy" or "cerebral infarction," is an acute cerebrovascular disease caused by the sudden rupture or blockage of blood vessels in the brain, resulting in insufficient blood supply to the brain and damage to brain tissue. It includes ischemic stroke and hemorrhagic stroke, with ischemic stroke currently being the most common type of stroke.

[0003] The most common treatment for ischemic stroke is intracranial artery thrombectomy. This procedure involves using a suction catheter, accessed via the femoral artery, to aspirate the thrombus from the intracranial vessel. Intracranial vessels are complex and fragile, with delicate inner walls and numerous bifurcations. When the distal end of the suction catheter reaches a bifurcation, it may come into contact with the vessel wall, potentially damaging the vessel wall and hindering entry into the target vessel. To ensure successful insertion, the catheter must be continuously pushed further into the vessel. However, with each insertion, the distal end pushes the vessel wall away from the bifurcation. During this process, the distal end of the aspiration catheter may damage the inner wall of the blood vessel, or even cause adverse events such as vascular rupture and dissection, resulting in serious complications. Even so, the distal end of the aspiration catheter may not be able to be turned. Usually, in this case, the aspiration catheter can only be turned and positioned by the doctor's experience and other surgical instruments. This not only wastes the golden window period of surgery, but may also increase the new risks of the surgery by using multiple surgical instruments. Summary of the Invention

[0004] The purpose of this application is to provide an aspiration catheter that solves the technical problem that aspiration catheters in the prior art are not easy to pass through at the bifurcation of blood vessels.

[0005] To achieve the above objectives, according to one aspect of this application, a suction catheter is provided, the suction catheter including a proximal end and a distal end disposed on one side of the proximal end, the distal end including a guide assembly and a steering assembly, the steering assembly being disposed between the guide assembly and the proximal end, the guide assembly including a guide outer tube, the steering assembly including a steering outer tube, the guide outer tube communicating with the steering outer tube, the elastic modulus of the guide outer tube being greater than the elastic modulus of the steering outer tube, the proximal end having a proximal channel communicating with the steering outer tube.

[0006] Optionally, the guide assembly further includes a guide inner tube, and a guide outer tube is sleeved on the outer peripheral surface of the guide inner tube. The steering assembly further includes a steering inner tube, and a steering outer tube is sleeved on the outer peripheral surface of the steering inner tube. The steering inner tube is connected to the guide inner tube.

[0007] Optionally, the guide assembly also includes an expansion ring, which is coaxial with the inner guide tube and embedded inside the inner guide tube. The outer diameter of the expansion ring is larger than the inner diameter of the inner guide tube, so that an expansion plane is formed on the outer circumferential surface of the outer guide tube.

[0008] Optionally, the end face of the expansion ring away from the steering inner tube is located on the side of the end face of the guide inner tube away from the steering inner tube that is close to the steering inner tube, so that a guide slope is formed on the outer circumferential surface of the guide outer tube on the side of the expansion plane away from the steering assembly, and the guide slope gradually slopes towards the guide inner tube from the end close to the expansion plane to the end away from the expansion plane.

[0009] Optionally, the inner wall surface of the guide inner tube is formed into a flared slope on the side of the expansion ring away from the steering inner tube, and the flared slope gradually slopes from the end near the expansion ring to the end away from the expansion ring towards the guide outer tube.

[0010] Optionally, the steering assembly also includes a reinforcing elastic ring, which is fitted onto the outer circumferential surface of the inner steering tube, and the outer steering tube is fitted onto the outer circumferential surface of the reinforcing elastic ring.

[0011] Optionally, the proximal end includes a proximal inner tube and a proximal outer tube, the proximal outer tube is sleeved on the outer circumferential surface of the proximal inner tube, the proximal outer tube is connected to the steering outer tube, the proximal outer tube forms a proximal channel, and the proximal inner tube is connected to the steering inner tube.

[0012] Optionally, the guiding assembly also includes a balloon and a trachea. The balloon is fitted on the outer peripheral surface of the inner guiding tube, and the outer guiding tube is fitted on the outer peripheral surface of the balloon. The first end of the trachea is connected to the balloon, and the second end of the trachea extends to the outside of the aspiration catheter through the gap between the inner and outer guiding tubes and the gap between the proximal inner and outer tubes.

[0013] Optionally, the aspiration conduit also includes a stabilizing component, which is located on the side of the steering component away from the guide component. The stabilizing component includes a stabilizing outer tube, a first end of which is connected to the steering outer tube, and a second end of which is connected to the proximal channel. The elastic modulus of the stabilizing outer tube is greater than that of the steering outer tube, and the maximum outer diameter of the stabilizing outer tube is greater than or equal to the outer diameter of the steering outer tube.

[0014] Optionally, the stabilizing component further includes a stabilizing inner tube, which is connected to the steering inner tube and the proximal inner tube, and a stabilizing outer tube is sleeved on the outer circumferential surface of the stabilizing inner tube; the stabilizing component further includes a spreading ring, which is coaxial with the stabilizing inner tube and embedded in the stabilizing inner tube, and the outer diameter of the spreading ring is greater than or equal to the inner diameter of the stabilizing inner tube; or, the stabilizing component further includes a stabilizing reinforcing ring, which is sleeved on the outer circumferential surface of the stabilizing inner tube, and the stabilizing outer tube is sleeved on the outer circumferential surface of the stabilizing reinforcing ring.

[0015] The beneficial effects of the aspiration catheter provided in this application are as follows: Compared with the prior art, when aspiration of thrombi in a patient's intracranial blood vessels is required, the operator applies a pushing force to the proximal end of the aspiration catheter to insert the distal end into the patient's intracranial blood vessel. The operator then controls the direction of the distal end by manipulating the proximal end. As the aspiration catheter is continuously inserted, the distal end will move to the bifurcation of the intracranial blood vessel. Based on relevant imaging data, the operator will push the distal end towards the target blood vessel according to actual needs. Under the guidance of the guide tube, the end face of the guide tube away from the turning tube will contact the wall of the target blood vessel. The operator will continue to push the distal end into the blood vessel. Because the elastic modulus of the directional catheter is less than that of the guide catheter, a portion of the pushing force applied from the proximal end to the distal end is absorbed by the directional catheter. At this point, the pushing force exerted by the guide catheter on the vessel wall will weaken. Simultaneously, under the bending and turning action of the directional catheter, the absorbed pushing force is converted into a bending force, causing the directional catheter to arch. Under these conditions, the end face of the guide catheter away from the directional catheter can be reversed and extended towards the target blood vessel. With the continuous insertion of the aspiration catheter, the guide catheter and the directional catheter will be smoothly inserted into the target blood vessel in sequence. Using the aspiration catheter described in this application not only facilitates the smooth passage of the distal end of the aspiration catheter through the blood vessel bifurcation but also reduces the damage caused to the vessel wall by the distal end of the aspiration catheter, which is beneficial to patient recovery. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a suction conduit with a guide component, a steering component, and a stabilizing component provided in an embodiment of this application;

[0018] Figure 2 A schematic diagram of the structure of a suction conduit with a guide component and a steering component provided in an embodiment of this application;

[0019] Figure 3 A cross-sectional schematic diagram of the distal end of the balloon with a guide assembly, a steering assembly and a stabilizing assembly provided for an embodiment of this application, in the balloon in a contracted state;

[0020] Figure 4 A cross-sectional schematic diagram of the distal end of the balloon with a guide assembly, a steering assembly, and a stabilizing assembly provided for an embodiment of this application, in the balloon in an inflated state;

[0021] Figure 5 This is a schematic diagram of the structure of the reinforcing elastic ring provided in an embodiment of this application;

[0022] Figure 6 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 7 A frontal view of the proximal end portion provided in an embodiment of this application;

[0024] Figure 8 A schematic diagram of the structure of the stabilizing reinforcing ring provided in an embodiment of this application;

[0025] Figure 9 A schematic diagram of the distal end of the balloon with a guide component, a steering component and a stabilizing component provided in an embodiment of this application, in the balloon in a contracted state and at the bifurcation of a blood vessel;

[0026] Figure 10 A schematic diagram of the distal end of the balloon, which includes a guide assembly, a steering assembly, and a stabilizing assembly, in the balloon in an inflated state and within the blood vessel to be inserted, as provided in an embodiment of this application.

[0027] The details of the reference numerals used in the above figures are as follows:

[0028] 100. Proximal end; 110. Proximal outer tube; 120. Proximal inner tube; 130. Proximal reinforcing ring; 200. Distal end; 210. Guiding assembly; 211. Guiding outer tube; 2111. Expansion plane; 2112. Guiding bevel; 212. Guiding inner tube; 2121. Flaring bevel; 213. Expansion ring; 214. Balloon; 215. Trachea; 220. Steering assembly; 221. Steering outer tube; 222. Steering inner tube; 223. Reinforcing elastic ring; 230. Stabilizing assembly; 231. Stabilizing outer tube; 232. Stabilizing inner tube; 233. Spreading ring; 234. Stabilizing reinforcing ring. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to that other element. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] Reference Figures 1 to 4 as well as Figure 9 To address the aforementioned problems, according to one aspect of this application, an embodiment of this application provides a suction catheter. The suction catheter includes a proximal end 100 and a distal end 200 disposed on one side of the proximal end 100. The distal end 200 includes a guide assembly 210 and a steering assembly 220. The steering assembly 220 is disposed between the guide assembly 210 and the proximal end 100. The guide assembly 210 includes a guide outer tube 211, and the steering assembly 220 includes a steering outer tube 221. The guide outer tube 211 and the steering outer tube 221 are in communication. The elastic modulus of the guide outer tube 211 is greater than the elastic modulus of the steering outer tube 221. The proximal end 100 has a proximal channel, which is in communication with the steering outer tube 221.

[0034] In this embodiment, the steering outer tube 221 and the guide outer tube 211 are coaxially arranged. The guide outer tube 211 can be made of materials such as high elastic modulus Pebax (Chinese name: polyether block polyamide) or high elastic modulus TPU (English full name: Thermoplastic Urethanes, Chinese name: thermoplastic polyurethane), while the steering outer tube 221 is made of low elastic modulus TPU. The elastic modulus of the guide outer tube 211 is greater than that of the steering outer tube 221. The end face of the guide outer tube 211 near the end of the steering outer tube 221 is fixedly connected to the end face of the steering outer tube 221 near the end of the guide outer tube 211.

[0035] When it is necessary to aspirate thrombi from a patient's intracranial blood vessels, the operator applies a pushing force to the proximal end 100 of the aspiration catheter to insert the distal end 200 into the patient's intracranial blood vessel. The operator then controls the direction of the distal end 200 by manipulating the proximal end 100. As the aspiration catheter is continuously inserted, the distal end 200 moves to the bifurcation of the intracranial blood vessel. Based on relevant imaging data, the operator will push the distal end 200 towards the target blood vessel as needed. Under the guidance of the guide tube 211, the end face of the guide tube 211 away from the turning tube 221 will contact the vessel wall inside the target blood vessel. The operator will then continue to push the distal end 200 into the blood vessel. During insertion, because the elastic modulus of the directional outer tube 221 is less than that of the guide outer tube 211, a portion of the pushing force applied by the proximal end 100 to the distal end 200 is absorbed by the directional outer tube 221. At this time, the pushing force applied by the guide outer tube 211 to the vessel wall is weakened. Simultaneously, under the bending and turning action of the directional outer tube 221, the absorbed pushing force is converted into a bending force, causing the directional outer tube 221 to arch. Under these conditions, the end face of the guide outer tube 211 away from the directional outer tube 221 can be reversed and extended towards the target vessel. With the continuous insertion of the aspiration catheter, the guide outer tube 211 and the directional outer tube 221 will be smoothly inserted into the target vessel in sequence. Using the aspiration catheter of this application not only facilitates the smooth passage of the distal end 200 of the aspiration catheter through the vessel bifurcation but also reduces the damage caused by the distal end 200 of the aspiration catheter to the vessel wall, which is beneficial to patient recovery.

[0036] Reference Figure 3 , Figure 4 and Figure 9 In this embodiment, the guide component 210 further includes a guide inner tube 212, and a guide outer tube 211 is sleeved on the outer peripheral surface of the guide inner tube 212. The steering component 220 further includes a steering inner tube 222, and a steering outer tube 221 is sleeved on the outer peripheral surface of the steering inner tube 222. The steering inner tube 222 is connected to the guide inner tube 212.

[0037] In this embodiment, the inner guide tube 212 and the outer guide tube 211 are coaxially arranged, and the inner steering tube 222 and the inner guide tube 212 are coaxially arranged. The inner guide tube 212 is made of PTFE (Polytetrafluoroethylene). The outer guide tube 211 is fixedly sleeved on the outer periphery of the inner guide tube 212 using a thermoplastic process. The end face of the inner guide tube 212 away from the inner steering tube 222 is flush with the end face of the outer guide tube 211 away from the outer steering tube 221. The end face of the inner guide tube 212 near the inner steering tube 222 is flush with the end face of the outer guide tube 211 near the outer steering tube 221. 12 not only provides support for the outer guide tube 211, but also strengthens the overall strength of the guide assembly 210; the inner steering tube 222 is also made of PTFE material. The inner steering tube 222 and the inner guide tube 212 are made of the same tube. The outer steering tube 221 is fixedly sleeved on the outer periphery of the inner steering tube 222. The end face of the inner steering tube 222 near the inner guide tube 212 is flush with the end face of the outer steering tube 221 near the outer guide tube 211. The end face of the inner steering tube 222 near the proximal end 100 is flush with the end face of the outer steering tube 221 near the proximal end 100. The inner steering tube 222 not only provides support for the outer steering tube 221, but also strengthens the overall strength of the steering assembly 220.

[0038] As an optional approach in this embodiment, the guide tube 211 may be manufactured by adding metal powder or corresponding metal compounds, such as W, BaSO4, etc., into the guide tube 211 during the manufacturing process to enhance the elastic modulus of the guide tube 211.

[0039] Reference Figure 3 and Figure 4 As an optional embodiment of this application, the guide component 210 further includes an expansion ring 213, which is coaxial with the guide inner tube 212 and embedded in the guide inner tube 212. The outer diameter of the expansion ring 213 is larger than the inner diameter of the guide inner tube 212, so that an expansion plane 2111 is formed on the outer circumferential surface of the guide outer tube 211.

[0040] In this optional configuration, the expansion ring 213 is a developing ring, which is fixedly embedded in the inner guide tube 212. The developing ring can be located entirely or partially within the inner guide tube 212. The expansion ring 213 is configured such that the outer diameter of the expansion plane 2111 is larger than the outer diameter of the outer guide tube 211. This design enhances the moment of inertia of the guide assembly 210, thereby enhancing the bending strength of the guide assembly 210 and preventing the guide assembly 210 from bending and deforming under pressure, thus ensuring the guiding function of the guide assembly 210.

[0041] Reference Figure 3 and Figure 4 As an optional embodiment of this application, the end face of the expansion ring 213 away from the steering inner tube 222 is located on the side of the end face of the guide inner tube 212 away from the steering inner tube 222, so that a guide slope 2112 is formed on the outer peripheral surface of the guide outer tube 211, located on the side of the expansion plane 2111 away from the steering assembly 220. The guide slope 2112 gradually slopes from the end near the expansion plane 2111 to the end away from the expansion plane 2111 towards the guide inner tube 212.

[0042] In this optional embodiment, the expansion ring 213 is located at the middle position of the inner guide tube 212. Of course, in other embodiments, the expansion ring 213 may also be located at other positions inside the inner guide tube 212. The provided guide slope 2112 further facilitates the smooth insertion of the guide assembly 210 into the target blood vessel and further reduces the damage to the inner wall of the blood vessel caused by the outer guide tube 211.

[0043] Reference Figure 3 and Figure 4 As an optional embodiment of this application, the outer edge of the guide tube 211 at the end face away from the turning tube 221 is formed with a rounded corner. This design of the outer edge further reduces the damage caused by the guide tube 211 to the inner wall of the blood vessel.

[0044] Reference Figure 3 and Figure 4 As an optional embodiment of this application, the inner wall surface of the guide inner tube 212 is formed as a flared slope 2121 on the side of the expansion ring 213 away from the steering inner tube 222. The flared slope 2121 gradually slopes from the end near the expansion ring 213 to the end away from the expansion ring 213 towards the guide outer tube 211.

[0045] In this optional method, the included angle between the flared bevel 2121 and the inner wall of the guide inner tube 212 is in the range of 1°-3°. By increasing the inner diameter of the guide inner tube 212 away from the port of the turning inner tube 222, the suction capacity of the aspiration catheter can be enhanced, and larger thrombi can be smoothly aspirated into the aspiration catheter, thereby improving the aspiration efficiency of the aspiration catheter.

[0046] Reference Figure 3 , Figure 4 as well as Figure 5 As an optional embodiment of this application, the steering assembly 220 further includes a reinforcing elastic ring 223, which is sleeved on the outer peripheral surface of the inner steering tube 222, and the outer steering tube 221 is sleeved on the outer peripheral surface of the reinforcing elastic ring 223.

[0047] In this optional configuration, the reinforcing elastic ring 223 is coaxially arranged with the steering inner tube 222. The reinforcing elastic ring 223 is a double-layer spring ring, which is fixedly sleeved on the outer circumferential surface of the steering inner tube 222. The steering outer tube 221 is fixedly sleeved on the outer circumferential surface of the double-layer spring ring using a thermoplastic process. The end face of the double-layer spring ring near the guide component 210 is flush with the end face of the steering inner tube 222 near the guide component 210, and the end face of the double-layer spring ring near the proximal end 100 is flush with the end face of the steering inner tube 222 near the proximal end 100. The reinforcing elastic ring 223 strengthens the overall strength of the steering assembly 220, preventing the steering inner tube 222 from collapsing during bending and ensuring the normal operation of the suction. Of course, in other embodiments, the reinforcing elastic ring 223 can also be a disc spring, a coil spring, or other spring rings with higher strength.

[0048] Reference Figures 1 to 3 , Figure 4 , Figure 6 as well as Figure 7 In this embodiment, the proximal end 100 includes a proximal inner tube 120 and a proximal outer tube 110. The proximal outer tube 110 is sleeved on the outer peripheral surface of the proximal inner tube 120. The proximal outer tube 110 is connected to the steering outer tube 221. The proximal outer tube 110 forms a proximal channel, and the proximal inner tube 120 is connected to the steering inner tube 222.

[0049] In this embodiment, the proximal inner tube 120 and the steering inner tube 222 are coaxially arranged, and the proximal outer tube 110 and the proximal inner tube 120 are coaxially arranged. The proximal outer tube 110 can be made of materials such as Pebax or TPU, and the proximal inner tube 120 is made of PTFE. The proximal inner tube 120 and the steering inner tube 222 are the same tube. The proximal outer tube 110 is fixedly sleeved on the outer circumferential surface of the proximal inner tube 120. The outer diameter of the proximal outer tube 110 is equivalent to the outer diameter of the steering outer tube 221. The end face of the proximal outer tube 110 near the steering outer tube 221 is flush with the end face of the proximal inner tube 120 near the steering inner tube 222. The end face of the proximal outer tube 110 away from the steering outer tube 221 is flush with the end face of the proximal inner tube 120 away from the steering inner tube 222. After the end face of the guide tube 211, away from the turning tube 221, is moved to the desired aspiration position within the blood vessel, the external aspiration device connects with the end of the proximal inner tube 120, away from the turning inner tube 222. Under the suction action of the external aspiration device, the thrombus within the blood vessel is sequentially aspirated through the guide tube 212, the turning inner tube 222, and the proximal inner tube 120. The proximal end 100 not only lengthens the entire aspiration catheter but also provides support for the distal end 200.

[0050] Reference Figure 3 , Figure 4 , Figure 6 as well as Figure 7 As an optional embodiment of this application, the proximal end 100 further includes a proximal reinforcing ring 130, which is sleeved on the outer peripheral surface of the proximal inner tube 120, and the proximal outer tube 110 is sleeved on the outer peripheral surface of the proximal reinforcing ring 130. Specifically, the proximal reinforcing ring 130 is coaxially arranged with the proximal inner tube 120. The proximal reinforcing ring 130 is a common spring coil to strengthen the entire proximal end 100 and prevent the proximal inner tube 120 from collapsing during the operation when the doctor applies pushing force to the proximal end 100. Of course, in other embodiments, the proximal reinforcing ring 130 can also be a spring coil with higher strength. In addition, the end face of the proximal reinforcing ring 130 near the steering outer tube 221 is flush with the end face of the proximal outer tube 110 near the steering outer tube 221, and the end face of the proximal reinforcing ring 130 away from the steering outer tube 221 is flush with the end face of the proximal outer tube 110 away from the steering outer tube 221.

[0051] Reference Figure 3 , Figure 4 , Figure 7 , Figure 9 as well as Figure 10 As an optional embodiment of this application, the guide assembly 210 further includes a balloon 214 and a trachea 215. The balloon 214 is sleeved on the outer peripheral surface of the inner guide tube 212, and the outer guide tube 211 is sleeved on the outer peripheral surface of the balloon 214. The first end of the trachea 215 is connected to the balloon 214, and the second end of the trachea 215 extends to the outside of the aspiration catheter through the gap between the inner guide tube 222 and the outer guide tube 221 and the gap between the proximal inner tube 120 and the proximal inner tube 120.

[0052] In this optional configuration, the balloon 214 and the inner guide tube 212 are coaxially arranged. The outer surface of the balloon 214 is fixedly connected to the outer peripheral surface of the inner guide tube 212, and the outer surface of the balloon 214 is fixedly connected to the inner wall surface of the outer guide tube 211. This allows the balloon 214 to not only stably inflate or contract with the inner guide tube 212, but also to be stably confined between the inner guide tube 212 and the outer guide tube 211. When the thrombus is aspirated into the steering inner tube 22 by the suction action of the aspiration device... After the inner or proximal inner tube 120 is inserted, the balloon 214 is pressurized through the trachea 215. The balloon 214 inflates and pushes the two opposing inner walls of the guide inner tube 212 towards each other, thus preventing the thrombus in the guide inner tube 222 or proximal inner tube 120 from flowing back into the patient's blood vessel. When the thrombus is aspirated out of the aspiration catheter and further aspiration of the thrombus from the patient's blood vessel is required, air is released from the balloon 214 through the trachea 215, causing the balloon 214 to contract. The guide tube 212 returns to its original shape using its own elasticity. Then, the aspiration device can be used again to aspirate the thrombus from the patient's blood vessels into the guide tube 212, and then sequentially aspirate it through the turning tube 222 and the proximal tube 120 to the outside of the aspiration catheter. A reinforcing elastic coil 223 is located in the gap between the turning tube 222 and the turning outer tube 221. The trachea 215 can pass through the gap in the reinforcing elastic coil 223. A proximal reinforcing coil 130 is located between the proximal inner tube 120 and the proximal outer tube 110. The trachea 215 can pass through the gap in the proximal reinforcing ring 130. This design, which places the trachea 215 in the gap between the inner and outer turning tubes 222 and 221, as well as in the gap between the proximal inner tube 120 and the proximal outer tube 110, avoids the need to insert the trachea 215 into the inner turning tube 222 and the proximal inner tube 120, which would affect the normal conduct of the aspiration operation. On the other hand, it also avoids the need to insert the trachea 215 outside the aspiration catheter, which would damage the inner wall of the patient's blood vessels.

[0053] Reference Figure 7 As an optional embodiment of this application, at least two tracheas 215 are provided, each trachea 215 is arranged circumferentially around the inner guide tube 212, the first end of each trachea 215 is connected to the balloon 214, and the second end of each trachea 215 extends to the outside of the suction catheter through the gap between the inner guide tube 222 and the outer guide tube 221 and the gap between the proximal inner tube 120 and the proximal inner tube 120 in sequence.

[0054] In this optional embodiment, two tracheas 215 are provided, and the two tracheas 215 are arranged opposite each other with the axis of the guide tube 212 as the center. Of course, in other embodiments, three, four or more tracheas 215 may also be provided. The multiple tracheas 215 provide a faster inflation speed and a faster contraction speed of the balloon 214.

[0055] Reference Figure 1 , Figure 3 and Figure 4 In this embodiment, the suction conduit also includes a stabilizing component 230. The stabilizing component 230 is located on the side of the steering component 220 away from the guide component 210. The stabilizing component 230 includes a stabilizing outer tube 231. The first end of the stabilizing outer tube 231 is connected to the steering outer tube 221, and the second end of the stabilizing outer tube 231 is connected to the proximal channel. The elastic modulus of the stabilizing outer tube 231 is greater than that of the steering outer tube 221, and the maximum outer diameter of the stabilizing outer tube 231 is greater than or equal to the outer diameter of the steering outer tube 221.

[0056] In this embodiment, the stabilizing outer tube 231 and the steering inner tube 222 are coaxially arranged. The stabilizing outer tube 231 can be made of materials such as Pebax or TPU with high elastic modulus. The elastic modulus of the stabilizing outer tube 231 is greater than that of the steering outer tube 221. The end face of the stabilizing outer tube 231 near the steering outer tube 221 is fixedly connected to the end face of the steering outer tube 221 away from the guide outer tube 211. The end face of the stabilizing outer tube 231 near the proximal outer tube 110 is fixedly connected to the end face of the proximal outer tube 110 near the stabilizing outer tube 231.

[0057] After the end face of the guide tube 211 away from the turning tube 221 contacts the wall of the target blood vessel, the operator will continue to push the distal end 200 into the intracranial blood vessel. Since the elastic modulus of the turning tube 221 is less than that of the guide tube 211, the pushing force applied by the proximal end 100 to the distal end 200 will be partially absorbed by the turning tube 221. At this time, the pushing force applied by the guide tube 211 to the blood vessel wall will be weakened. At the same time, under the bending and turning action of the turning tube 221 and the stable pushing action of the stabilizing tube 231, the part of the pushing force absorbed by the turning tube 221 will be converted into bending force, so that the turning tube 221 arches. Under this condition, the end face of the guide tube 211 away from the turning tube 221 can be reversed and extended towards the target blood vessel. With the continuous insertion of the aspiration catheter, the guide tube 211 and the turning tube 221 will also be successfully inserted into the target blood vessel in sequence. The stabilizing component 230 not only provides a pushing and supporting function, ensuring that the steering component 220 has sufficient arching when bending, thus ensuring that the guide tube 211 can smoothly pass through the blood vessel bifurcation and be inserted into the target blood vessel, improving the throughput and throughput rate, but also blocks blood and thrombi located on the side of the stabilizing component 230 away from the steering component 220 from flowing to the end position of the guide tube 211 away from the steering tube 221, reducing the flow velocity of blood and thrombi at the end position of the guide tube 211 away from the steering tube 221, and greatly improving the aspiration efficiency and aspiration rate.

[0058] Reference Figure 3 and Figure 4 As an optional embodiment of this application, the stabilizing component 230 further includes a stabilizing inner tube 232, and a stabilizing outer tube 231 is sleeved on the outer peripheral surface of the stabilizing inner tube 232. The stabilizing inner tube 232 is connected to the steering inner tube 222 and to the proximal inner tube 120.

[0059] In this optional configuration, the stabilizing inner tube 232 and the stabilizing outer tube 231 are coaxially arranged. The stabilizing inner tube 232 is made of PTFE material and is the same tube as the steering inner tube 222. The stabilizing outer tube 231 is fixedly sleeved on the outer circumferential surface of the stabilizing inner tube 232. The end face of the stabilizing inner tube 232 near the steering inner tube 222 is flush with the end face of the stabilizing outer tube 231 near the steering outer tube 221. The end face of the stabilizing inner tube 232 near the proximal inner tube 120 is flush with the end face of the stabilizing outer tube 231 near the proximal outer tube 110. The stabilizing inner tube 232 not only provides support for the stabilizing outer tube 231 but also strengthens the overall strength of the stabilizing assembly 230.

[0060] Reference Figure 3 and Figure 4 As an optional embodiment of this application, the stabilizing component 230 further includes a spreading ring 233, which is coaxial with the stabilizing inner tube 232 and embedded in the stabilizing inner tube 232. The outer diameter of the spreading ring 233 is greater than or equal to the inner diameter of the stabilizing inner tube 232.

[0061] In this optional configuration, the expansion ring 233 is a developing ring, which is fixedly embedded within the stabilizing inner tube 232. The expansion ring 233 creates an expansion plane on the outer circumferential surface of the stabilizing outer tube 231 with an outer diameter greater than or equal to the outer diameter of the stabilizing outer tube 231, thereby enhancing the moment of inertia of the entire stabilizing assembly 230 and thus enhancing the bending strength of the entire stabilizing assembly 230. Furthermore, when the end face of the expansion ring 233 near the steering inner tube 222 is located on the side of the stabilizing inner tube 232 near the proximal inner tube 120, an inclined surface is formed on the outer circumferential surface of the stabilizing outer tube 231 on the side of the expansion plane away from the proximal end 100. This inclined surface gradually slopes towards the stabilizing inner tube 232 from the end near the expansion plane to the end away from the expansion plane. Specifically, the spreading ring 233 can be located at the middle position of the stabilizing inner tube 232, and the resulting inclined surface acts as a guide, facilitating the smooth movement of the stabilizing component 230 within the blood vessel and reducing the damage to the inner wall of the blood vessel caused by the stabilizing outer tube 231. Of course, when the inner diameter of the blood vessel is small or the size of the superselective blood vessel turning angle is small, and the conditions are relatively mild, the spreading ring 233 may not be provided inside the stabilizing inner tube 232. In this case, the outer diameter of the stabilizing outer tube 231 remains unchanged along the axial direction of the stabilizing outer tube 231 and is the same as the outer diameter of the turning outer tube 221.

[0062] Reference Figure 3 , Figure 4 as well as Figure 8 As an optional embodiment of this application, the stabilizing component 230 further includes a stabilizing reinforcing ring 234, which is sleeved on the outer peripheral surface of the stabilizing inner tube 232, and the stabilizing outer tube 231 is sleeved on the outer peripheral surface of the stabilizing reinforcing ring 234.

[0063] In this optional embodiment, the stabilizing reinforcing ring 234 is coaxially arranged with the stabilizing inner tube 232 and can be the same component as the proximal reinforcing ring 130. The stabilizing reinforcing ring 234 is made of ordinary spring coil to enhance the overall strength of the stabilizing assembly 230 and prevent the stabilizing inner tube 232 from collapsing during the process of the operator applying pushing force to the distal end 200. Of course, in other embodiments, the stabilizing reinforcing ring 234 can also be made of spring coil with higher strength. In addition, the end face of the stabilizing reinforcing ring 234 near the steering outer tube 221 is flush with the end face of the stabilizing outer tube 231 near the steering outer tube 221, and the end face of the stabilizing reinforcing ring 234 away from the steering outer tube 221 is flush with the end face of the stabilizing outer tube 231 away from the steering outer tube 221.

[0064] In summary, the aspiration catheter provided in this embodiment has at least the following beneficial technical effects: When it is necessary to aspirate thrombi from a patient's intracranial blood vessels, the operator applies a pushing force to the proximal end 100 of the aspiration catheter to insert the distal end 200 into the patient's intracranial blood vessel. The operator can then control the direction of the distal end 200 by manipulating the proximal end 100. As the aspiration catheter is continuously inserted, the distal end 200 will move to the bifurcation of the intracranial blood vessel. Based on the corresponding imaging data, the operator will push the distal end 200 towards the target blood vessel according to actual needs. Under the guidance of the guide tube 211, the end face of the guide tube 211 away from the turning tube 221 will contact the vessel wall inside the target blood vessel. Then, the operator... The distal end 200 will continue to be pushed into the blood vessel. Since the elastic modulus of the directional outer tube 221 is less than that of the guide outer tube 211, a portion of the pushing force applied by the proximal end 100 to the distal end 200 will be absorbed by the directional outer tube 221. At this time, the pushing force applied by the guide outer tube 211 to the inner wall of the blood vessel will weaken. Simultaneously, under the bending and turning action of the directional outer tube 221, the portion of the pushing force absorbed by the directional outer tube 221 will be converted into a bending force, causing the directional outer tube 221 to arch. Under these circumstances, the end face of the guide outer tube 211 away from the directional outer tube 221 can be reversed and extended towards the target blood vessel. With the continuous insertion of the aspiration catheter, the guide outer tube 211 and the directional outer tube 221 will be smoothly inserted into the target blood vessel in sequence. Using the aspiration catheter of this application not only facilitates the smooth passage of the distal end 200 of the aspiration catheter through the bifurcation of the blood vessel, but also reduces the damage caused by the distal end 200 of the aspiration catheter to the inner wall of the blood vessel, which is beneficial to the patient's recovery.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A suction catheter, characterized in that, The aspiration catheter includes a proximal end (100) and a distal end (200) disposed on one side of the proximal end (100). The distal end (200) includes a guide assembly (210) and a steering assembly (220). The steering assembly (220) is disposed between the guide assembly (210) and the proximal end (100). The guide assembly (210) includes a guide outer tube (211), and the steering assembly (220) includes a steering outer tube (221). The guide outer tube (211) communicates with the steering outer tube (221). The elastic modulus of the guide outer tube (211) is greater than that of the steering outer tube (221). The proximal end (100) has a proximal channel, and the proximal channel communicates with the steering outer tube (221). The guide assembly (210) further includes an inner guide tube (212), and the outer guide tube (211) is sleeved on the outer circumferential surface of the inner guide tube (212). The steering assembly (220) further includes an inner steering tube (222), and the outer steering tube (221) is sleeved on the outer circumferential surface of the inner steering tube (222). The inner steering tube (222) is connected to the inner guide tube (212). The outer guide tube (211) is fixedly sleeved on the outer circumference of the inner guide tube (212). The inner steering tube (222) and the inner guide tube (212) are made of the same tube material. The outer steering tube (221) is fixedly sleeved on the outer circumference of the inner steering tube (222). The guide assembly (210) further includes an expansion ring (213), which is a developing ring. The expansion ring (213) is coaxial with the inner guide tube (212) and is embedded in the inner guide tube (212). The outer diameter of the expansion ring (213) is larger than the inner diameter of the inner guide tube (212) so that an expansion plane (2111) is formed on the outer circumferential surface of the outer guide tube (211). The end face of the expansion ring (213) away from the steering inner tube (222) is located on the side of the guide inner tube (212) away from the steering inner tube (222) so that a guide slope (2112) is formed on the outer peripheral surface of the guide outer tube (211) on the side of the expansion plane (2111) away from the steering assembly (220). The guide slope (2112) gradually slopes towards the guide inner tube (212) from the end near the expansion plane (2111) to the end away from the expansion plane (2111). The inner wall surface of the guide inner tube (212) is formed into a flared slope (2121) on the side of the expansion ring (213) away from the steering inner tube (222). The flared slope (2121) gradually slopes from one end close to the expansion ring (213) to the end away from the expansion ring (213) towards the guide outer tube (211).

2. The aspiration catheter according to claim 1, characterized in that, The steering assembly (220) also includes a reinforcing elastic ring (223), which is sleeved on the outer circumferential surface of the inner steering tube (222), and the outer steering tube (221) is sleeved on the outer circumferential surface of the reinforcing elastic ring (223).

3. The aspiration catheter according to claim 2, characterized in that, The proximal end (100) includes a proximal inner tube (120) and a proximal outer tube (110). The proximal outer tube (110) is sleeved on the outer circumferential surface of the proximal inner tube (120). The proximal outer tube (110) is connected to the steering outer tube (221). The proximal outer tube (110) forms the proximal channel. The proximal inner tube (120) is connected to the steering inner tube (222).

4. The aspiration catheter according to claim 3, characterized in that, The guide assembly (210) further includes a balloon (214) and a trachea (215). The balloon (214) is fitted on the outer peripheral surface of the inner guide tube (212), and the outer guide tube (211) is fitted on the outer peripheral surface of the balloon (214). The first end of the trachea (215) is connected to the balloon (214), and the second end of the trachea (215) extends to the outside of the suction catheter through the gap between the inner guide tube (222) and the outer guide tube (221) and the gap between the proximal inner tube (120) and the proximal inner tube (120).

5. The aspiration catheter according to claim 3, characterized in that, The suction catheter also includes a stabilizing component (230), which is located on the side of the steering component (220) away from the guide component (210). The stabilizing component (230) includes a stabilizing outer tube (231), the first end of which is connected to the steering outer tube (221), and the second end of which is connected to the proximal channel. The elastic modulus of the stabilizing outer tube (231) is greater than that of the steering outer tube (221), and the maximum outer diameter of the stabilizing outer tube (231) is greater than or equal to the outer diameter of the steering outer tube (221).

6. The aspiration catheter according to claim 5, characterized in that, The stabilizing component (230) further includes a stabilizing inner tube (232), which is connected to the steering inner tube (222) and the proximal inner tube (120), and the stabilizing outer tube (231) is sleeved on the outer circumferential surface of the stabilizing inner tube (232); The stabilizing component (230) further includes a spreading ring (233), which is coaxial with the stabilizing inner tube (232) and embedded within the stabilizing inner tube (232). The outer diameter of the spreading ring (233) is greater than or equal to the inner diameter of the stabilizing inner tube (232); or, The stabilizing component (230) further includes a stabilizing reinforcing ring (234), which is sleeved on the outer circumferential surface of the inner stabilizing tube (232), and the outer stabilizing tube (231) is sleeved on the outer circumferential surface of the stabilizing reinforcing ring (234).

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