Aspiration catheter

Abstract

This invention belongs to the field of medical device technology, specifically relating to an aspiration catheter. The aspiration catheter of this invention includes a tube body and a traction assembly. A first channel is axially provided within the tube body. The traction assembly is disposed within the tube body and includes a fixed base, a movable component, and a traction member. The fixed base is fixed within the tube body and has a pressure chamber. The movable component is movably placed within the fixed base and divides the pressure chamber into a first chamber and a second chamber. The first or second chamber communicates with the first channel to change the pressure difference between the first and second chambers, thereby moving the movable component. The distal end of the traction member is connected to the distal end of the tube body, and the proximal end of the traction member is connected to the movable component. The traction member pulls or releases the tube body during the movement of the movable component. According to this invention, the aspiration catheter can avoid adhering to the blood vessel wall during thrombus aspiration, preventing vascular tearing and damage.

Description

Technical Field

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

[0002] Interventional therapy is a rapidly developing emerging discipline that integrates imaging diagnosis and clinical treatment. It has now become one of the three pillars of clinical medicine, alongside traditional internal medicine and surgery. Interventional therapy has the advantages of being minimally invasive, simple to operate, effective, and repeatable, making it a promising direction for the diagnosis and treatment of vascular diseases.

[0003] Peripheral thrombus aspiration catheters, as an auxiliary device in interventional procedures, are primarily used for peripheral arterial diseases. They can rapidly reduce local thrombus burden and decrease the need for balloon dilation. The basic principle of existing peripheral thrombus aspiration catheters is to use negative pressure aspiration to remove thrombi from peripheral blood vessels through the catheter. This aspiration method creates continuous negative pressure at the aspiration port, which can easily cause the aspiration port to adhere to the vessel wall. Once adhered to the vessel wall, it can easily cause patient discomfort, and in severe cases, lead to spasms, vascular dissection, and other problems, while also affecting the surgeon's efficiency. Summary of the Invention

[0004] The objective of this invention is to at least solve the problem of suction catheters adhering to the blood vessel wall during the suction process. This objective is achieved through the following means:

[0005] This invention proposes a suction catheter, the suction catheter comprising:

[0006] The tube body has a first channel arranged axially upward inside the tube body;

[0007] A traction assembly is disposed within the tube body; the traction assembly includes a fixed base, a movable component, and a traction component; wherein, the fixed base is fixedly disposed within the tube body and has a pressure chamber therein, the movable component is movably disposed within the fixed base and divides the pressure chamber into a first chamber and a second chamber, the first chamber or the second chamber being connected to a first channel, so as to change the pressure difference between the first chamber and the second chamber through the first channel, thereby causing the movable component to move;

[0008] The distal end of the pulling member is connected to the distal end of the tube body, and the proximal end of the pulling member is connected to the moving member. The pulling member pulls or releases the tube body during the movement of the moving member.

[0009] In addition, the aspiration catheter according to the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the proximal end of the traction member passes through the first chamber and is connected to the moving member, and the first channel is an inflation channel and communicates with the first chamber, or the first channel is an exhaust channel and communicates with the second chamber.

[0011] In some embodiments of the present invention, the pulling assembly further includes an elastic element for connecting the fixed base and the moving member, and the elastic element is used to restore the tube body to a released state; wherein, the elastic element is disposed in the first chamber and is in a stretched state during the pulling member pulling the tube body; or the elastic element is disposed in the second chamber and is in a compressed state during the pulling member pulling the tube body.

[0012] In some embodiments of the present invention, the fixed base is further provided with a positioning boss inside, one end of the elastic member is sleeved on the outside of the positioning boss, and the other end of the elastic member is connected to the moving member.

[0013] In some embodiments of the present invention, the distance between the fixing seat and the far end opening of the tube body is greater than or equal to 1 / 4 of the axial length of the tube body and less than or equal to 1 / 2 of the axial length of the tube body.

[0014] In some embodiments of the present invention, the traction assembly further includes a sleeve fixed within the tube body, the traction member is sleeved within the sleeve and is axially movable relative to the sleeve, the distal end of the sleeve and the distal end of the traction member are connected together to the distal end of the tube body, and the proximal end of the traction member passes through the proximal end of the sleeve and is connected to the movable member.

[0015] In some embodiments of the present invention, the tube body includes an inner membrane layer, an intermediate layer and an outer membrane layer arranged sequentially from the inside to the outside, and the fixing seat is disposed between the intermediate layer and the outer membrane layer.

[0016] In some embodiments of the present invention, the aspiration catheter further includes a second channel, which is connected to another of the first chamber and the second chamber, for balancing the pressure difference between the first chamber and the second chamber.

[0017] In some embodiments of the present invention, the distal end face of the tube body is a wedge-shaped structure inclined relative to the axis of the tube body, and the wedge angle of the wedge-shaped structure is 10° to 20°.

[0018] In some embodiments of the present invention, the aspiration catheter further includes a radiopaque element, which is disposed on the distal outer peripheral surface of the tube body, and the distal end of the pulling member is connected to the location on the tube body where the radiopaque element is disposed.

[0019] According to the aspiration catheter of the present invention, a fixing seat is disposed inside the tube body, and a first chamber and a second chamber are provided inside the fixing seat. The pressure difference between the first chamber and the second chamber is changed through a first channel, thereby causing the moving component inside the fixing seat to move. During the movement of the moving component, the tube body is pulled or released by a pulling wire, thereby changing the orientation of the aspiration port at the distal end of the aspiration catheter. This prevents the aspiration catheter from bending significantly and adhering to the blood vessel wall during thrombus aspiration, thus avoiding vascular tearing and damage. Simultaneously, during the bending process of the tube body, the movement of the moving component within the fixing seat makes the pulling process smoother, ensuring the reliability of the bending process and effectively preventing abrupt changes in the bending direction of the distal end of the tube body due to uneven force on the pulling component. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0021] Figure 1 This is a partial structural diagram of the suction catheter in the released state according to an embodiment of this application;

[0022] Figure 2 for Figure 1 A schematic diagram of a portion of the aspiration catheter in a bent state;

[0023] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of section AA;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure in the end face direction;

[0025] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of section BB in the middle;

[0026] Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure of section CC;

[0027] Figure 7 for Figure 6 An enlarged structural diagram of part D in the diagram;

[0028] Figure 8 for Figure 7 A schematic diagram of the structure of the middle traction component at the first angle;

[0029] Figure 9 for Figure 7A schematic diagram of the second angle of the middle traction component;

[0030] Figure 10 for Figure 7 A schematic diagram of the third angle of the traction assembly;

[0031] Figure 11 for Figure 1 A schematic diagram of the structure at the distal end of the central tube.

[0032] The labels in the attached diagram are as follows:

[0033] 1: Aspiration catheter;

[0034] 10: Tube body, 11: Inner membrane layer, 111: Suction chamber, 12: Intermediate layer, 13: Outer membrane layer, 14: First pipe, 15: Second pipe, 16: Suction port;

[0035] 20: Traction assembly; 21: Fixing seat; 211: First chamber; 212: Second chamber; 213: Guide post; 22: Moving part; 23: Traction component; 24: Elastic component; 25: Positioning boss; 26: Sleeve;

[0036] 30: Inner tube; 31: Guide wire lumen;

[0037] 40: Guide tube seat; 41: Air inlet; 42: Exhaust outlet;

[0038] 50: Developed piece. Detailed Implementation

[0039] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0040] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0041] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0042] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0043] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the operator during the surgical procedure, "proximal" refers to the end closest to the operator during the surgical procedure, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial".

[0044] Combination Figures 1 to 6 As shown, the aspiration catheter 1 of this embodiment is used to aspirate thrombi within blood vessels, and includes a tube body 10 and a traction assembly 20. The tube body 10 has an aspiration chamber 111 inside for aspirating and transporting thrombi within the blood vessel. (Combined with...) Figures 7 to 10As shown, the traction assembly 20 of this embodiment is disposed within the tube body 10. The traction assembly 20 includes a fixed base 21, a movable member 22, and a traction member 23. The fixed base 21 is fixedly disposed within the tube body 10 and has a pressure chamber within it. The movable member 22 is movably disposed within the fixed base 21 and divides the pressure chamber into a first chamber 211 and a second chamber 212. A first pipe 14 is also disposed within the tube body 10, and a first channel is formed inside the first pipe 14. The first chamber 211 communicates with the first channel, and the pressure difference between the first chamber 211 and the second chamber 212 is changed through the first channel, thereby causing the movable member 22 to move. The distal end of the pulling member 23 is connected to the distal end of the tube 10, and the proximal end of the pulling member 23 passes through the first chamber 211 and is connected to the moving member 22. The connection method can be adhesive bonding or welding. Thus, the pulling member 23 pulls or releases the tube 10 during the movement of the moving member 22, thereby changing the orientation of the suction port 16 at the distal end of the tube 10. In this embodiment, the pulling member 23 is a traction wire, and the moving member 22 is a plate-like structure that fits snugly against the inner wall of the pressure chamber. While being able to move along the axial direction of the fixed seat 21, it ensures a seal with the inner wall of the fixed seat 21, preventing communication between the first chamber 211 and the second chamber 212. Specifically, the moving member 22 in this embodiment is made of one of PVC, polyethylene, PP, or PC. The fixed seat 21 is also made of one of PVC, polyethylene, PP, or PC.

[0045] According to the aspiration catheter 1 of the present invention, by placing a fixing seat 21 inside the tube body 10, and providing a first chamber 211 and a second chamber 212 inside the fixing seat 21, the pressure difference between the first chamber 211 and the second chamber 212 is changed through a first channel, thereby causing the moving member 22 inside the fixing seat 21 to move. During the movement of the moving member 21, the tube body 10 is pulled or released by the pulling member 23, thereby achieving the purpose of bending the tube body 10, thereby changing the orientation of the distal aspiration port 16, and preventing the aspiration catheter 1 from adhering to the blood vessel wall during the aspiration of thrombi, causing vascular tearing damage. At the same time, during the bending process of the tube body 10, the movement of the moving member 22 within the fixing seat 21 makes the pulling process more stable, ensuring the reliability of the bending process, and effectively preventing abrupt changes in the bending direction of the distal end of the tube body 10 due to uneven force on the pulling member 23.

[0046] Specifically, such as Figures 3 to 5As shown, the tube 10 of this embodiment has a three-layer mesh structure with an inner membrane layer 11, an intermediate layer 12, and an outer membrane layer 13, arranged sequentially from the inside to the outside. Specifically, the inner membrane layer 11 can be made of PTFE (polytetrafluoroethylene) lining, the intermediate layer 12 can be made of S304 steel spring layer or braided layer, and the outer membrane layer 13 can be made of Pebax (polyether block polyamide) or nylon layer. The composite tube formed by the above materials has good support and flexibility, which facilitates the delivery and bending of the tube 10 in the blood vessel. The fixing seat 21 is disposed between the intermediate layer 12 and the outer membrane layer 13. Specifically, the intermediate layer 12 and the inner membrane layer 11 are recessed towards the aspiration cavity 111, thereby forming a cavity for accommodating the fixing seat 21. The fixing seat 21 is disposed in this cavity and spaced apart from the outer membrane layer 13. An axial lumen channel is provided between the intermediate layer 12 and the outer membrane layer 13, within which an inner tube 30 and a first conduit 14 are arranged side-by-side. A guidewire lumen 31 is formed inside the inner tube 30, through which a guidewire can be inserted. One end of the guidewire extends to the distal end of the tube body 10 to guide the tube body 10 in blood vessel delivery, while the other end extends to the proximal end of the tube body 10 for easy manipulation. The inner tube 30 is typically made of one or more of the following materials: nylon, polyethylene, PEBAX, or latex.

[0047] Furthermore, combined Figures 7 to 9 As shown, in this embodiment, the first chamber 211 is located near the distal end of the tube 10, and the second chamber 212 is located near the proximal end of the tube 10. The proximal end of the pulling member 23 passes through the first chamber 211 and is connected to the moving member 22. In this embodiment, the first channel is an inflation channel and is connected to the first chamber 211. The end of the first pipe 14 is inserted into the first chamber 211 and fixed by adhesive or welding. Gas is introduced into the first chamber 211 through the first channel, increasing the air pressure inside the first chamber 211. This drives the moving member 22 to move towards the proximal end of the tube 10 and compress the second chamber 212, thereby causing the distal end of the pulling member 23 to move towards the proximal end of the tube 10, causing the distal end of the tube 10 to bend and changing the orientation of the suction port 16 at the distal end of the tube 10.

[0048] Furthermore, combined Figures 7 to 9As shown, the traction assembly 20 of this embodiment also includes an elastic element 24, which is disposed in the second chamber 212. One end of the elastic element 24 is connected to the moving member 22, and the other end of the elastic element 24 is connected to the bottom of the second chamber 212. The connection method can be adhesive or welding. When the tube 10 is in the released state, the elastic element 24 is in its natural state. When gas is introduced into the first chamber 211 through the first channel, the moving member 22 moves toward the proximal end of the tube 10 and compresses the elastic element 24 in the second chamber 212. The elastic element 24 has elastic potential energy in the compressed state. When the gas in the first chamber 211 is discharged and the pressure decreases, the elastic element 24 recovers its deformation through its own elastic potential energy and drives the moving member 22 to move toward the distal end of the tube 10 and compress the first chamber 211, thereby releasing the tube 10, reducing the bending amplitude of the tube 10, and finally allowing the tube 10 to return to its natural state when the elastic element 24 returns to its natural state. Figure 1 The release state is shown, and no additional pressurization structure connected to the second chamber 212 is required during this recovery process. Specifically, the elastic element 24 in this embodiment is a spring, and the spring is made of stainless steel or nickel-titanium alloy.

[0049] Furthermore, combined Figures 7 to 9 As shown, the suction conduit 1 of this embodiment also includes a second pipe 15, which has a second channel connected to the second chamber 212 to balance the pressure difference between the first chamber 211 and the second chamber 212. Since the first channel in this embodiment is an inflation channel connected to the first chamber 211, the second channel is an exhaust channel, with one end connected to the second chamber 212 and the other end extending to the outside of the pipe body 10 for exhaust. When the moving member 22 compresses the second chamber 212 under the inflation action of the first channel, the gas in the second chamber 212 is discharged to the outside of the second chamber 212 through the second channel, thereby ensuring that the moving member 22 moves axially within the pressure chamber. To accelerate the exhaust speed of the second channel, the second channel in this embodiment can also be connected to a suction unit, so that while the first channel inflates the first chamber 211, the suction unit is activated to suction the second chamber 212 through the second channel, accelerating the movement speed of the moving member 22 and thus achieving the purpose of quickly bending the pipe 10. In this embodiment, the first pipe 14, the second pipe 15, the inner pipe 30, and the fixing base 21 are all fixed between the intermediate layer 12 and the outer membrane layer 13 by heat fusion. Specifically, in this embodiment, the first pipe 14 and the second pipe 15 are both made of one or more of nylon, polyethylene, and PEBAX.

[0050] In other embodiments of this application, the elastic member 24 may be placed inside the first chamber 211, and the first channel may be an inflation channel connected to the first chamber 211. In this case, when the first channel is inflated toward the first chamber 211, the moving member 22 moves toward the proximal end of the tube 10 and stretches the elastic member 24. When the pressure in the first chamber 211 decreases, the moving member 22 is pulled back to its original position by the elastic deformation of the elastic member 24, thereby releasing and bending the distal end of the tube 10.

[0051] In other embodiments of this application, the first channel may also be an exhaust channel and connected to the second chamber 212. In this case, the second pipe 15 has the first channel, and the first pipe 14 has the second channel. Specifically, in one embodiment of this application, the elastic member 24 is disposed in the second chamber 212, and the air extraction unit is connected to the second chamber 212 through the first channel and is used to extract the gas from the second chamber 212. When the gas in the second chamber 212 is discharged through the first pipe, the moving member 22 moves toward the proximal end of the pipe body 10 and squeezes the elastic member 24, so that the elastic member 24 is in a compressed state, and the first chamber 211 is inflated through the second channel, thereby balancing the pressure difference between the first chamber 211 and the second chamber 212.

[0052] In other embodiments of this application, the elastic element 24 may be disposed within the first chamber 211, and the first channel is also an exhaust channel connected to the second chamber 212. The extraction unit is connected to the second chamber 212 through the first channel and is used to extract gas from the second chamber 212. When the gas in the second chamber 212 is discharged through the first pipe, the moving element 22 moves toward the proximal end of the tube body 10 and stretches the elastic element 24, so that the elastic element 24 is in a stretched state, and the first chamber 21 is inflated through the second channel, thereby balancing the pressure difference between the first chamber 211 and the second chamber 212.

[0053] Furthermore, combined again Figures 8 to 10 As shown, the end of the second chamber 212 in this embodiment is also provided with a positioning boss 25. One end of the elastic member 24 is sleeved on the outside of the positioning boss 25, and the other end of the elastic member 24 is connected to the moving member 22, so that the end of the elastic member 24 is fixed during the deformation process of the elastic member 24, ensuring that the elastic member 24 can deform along its own axial direction, thereby ensuring the running trajectory of the moving member 22 in the pressure chamber.

[0054] Furthermore, combined again Figures 8 to 10As shown, the traction assembly 20 of this embodiment also includes a sleeve 26, which is sleeved on the outside of the traction member 23. The distal end of the sleeve 26 and the distal end of the traction member 23 are connected to the distal end of the tube body 10. The connection method can be by dispensing or welding. The proximal end of the sleeve 26 is connected to the fixing seat 21 and inserted into the interior of the fixing seat 21. Specifically, it can be connected to the fixing seat 21 by dispensing or welding. The proximal end of the traction member 23 passes through the proximal end of the sleeve 26 and is connected to the moving member 22. Specifically, the sleeve 26 of this embodiment is heat-fused to the inside of the tube wall of the tube body 10 and can bend with the tube body 10. The sleeve 26 can shield the traction member 23 to prevent damage to the traction member 23 during the heat-fusion process. At the same time, the proximal end of the sleeve 26 can prevent wear between the traction member 23 and the fixing seat 21.

[0055] Furthermore, the suction catheter 1 of this embodiment also includes a developing element 50. Specifically, the distal end face of the tube body 10 in this embodiment has a wedge-shaped structure that is inclined relative to the axis of the tube body 10, that is, the suction port 16 has an inclined structure, and the wedge angle of the wedge structure is 10° to 20°. The suction force is equal to the product of the pressure and the area of ​​the suction port. Compared with a circular port, the wedge-shaped port can provide a greater suction force, thereby giving the suction catheter 1 a better suction force. The wedge angle is greater than 10°, which facilitates the preparation of the wedge structure at the distal end of the catheter 10. The developing element 50 is fixed at the starting point of the oblique cut of the suction port 16 by forging, thereby facilitating the confirmation of the position of the distal end of the tube body 10. In this embodiment, the developing element 50 is a developing ring, which is arranged around the outside of the tube body 10. The material of the developing element 50 is generally one of tantalum, platinum, and iridium.

[0056] Furthermore, the distal end of the pulling member 23 in this embodiment is connected to the position where the developing member 50 is provided on the tube body 10, so that when the distal end of the tube body 10 is bent and deformed, the developing member 50 can make an accurate judgment, thereby further improving the safety and reliability of the operation.

[0057] Furthermore, the aspiration catheter 1 of this embodiment also includes a catheter seat 40, which has an air inlet 41 and an outlet 42. The air inlet 41 is connected to the first channel, so that the first chamber 211 can be inflated through the air inlet 41, driving the moving member 22 to squeeze the second chamber 212 and causing the pulling member 23 to move towards the proximal end of the tube body 10, thereby bending the distal end of the tube body 10 and changing the orientation of the aspiration port 16. The outlet 42 is connected to the aspiration chamber 111, thereby being used to remove the thrombus aspirated into the aspiration chamber 111.

[0058] Due to existing bending techniques, the bending wire essentially runs through the entire catheter. During actual surgery, the surgeon pulls the bending wire using an external bending device to achieve the desired bending effect. However, because the wire runs through the entire catheter, the force applied during the pulling process inevitably affects the catheter body itself, causing it to bend (bow). Severe "bowing" can rub against healthy blood vessels, leading to vascular damage. Therefore, in this embodiment, the distance between the fixing seat 21 and the distal opening of the catheter body 10 is greater than or equal to 1 / 4 and less than or equal to 1 / 2 of the axial length of the catheter body 10. In other words, the distance between the proximal end of the pulling member 23 and the distal opening of the catheter body 10 is greater than or equal to 1 / 4 and less than or equal to 1 / 2 of the axial length of the catheter body 10. In this embodiment, the axial length is the maximum distance from the distal end of the guide tube seat 40 to the distal end of the tube body 10, that is, the endpoint position from the oblique cut of the suction port 16 of the tube body 10, such as... Figure 1 Within the length L shown. Compared to the overall length of the traction wire through the catheter in the prior art, the fixing seat 21 in this embodiment is located near the distal end of the tube body 10. When adjusting the position of the distal opening of the tube body 10, only the part of the tube body 10 near the distal end is bent and deformed, while the tube body 10 as a whole remains straight. This ensures that while changing the orientation of the suction port 16, the entire tube body 10 is not subjected to reaction force during the bending process, effectively preventing the occurrence of the "bow back" phenomenon, improving the safety and stability of the suction catheter 1 during use, and avoiding damage to blood vessels.

[0059] By using the aspiration catheter 1 of this embodiment, the position of the distal aspiration port 16 of the catheter 10 can be adjusted in real time according to the position of the angiography and the imaging element 50 on the catheter body 10. Gas is introduced into the first chamber 211 through the first channel, the air pressure in the first chamber 211 rises and pushes the moving member 20 to squeeze the second chamber 212, and at the same time drives the pulling member 23 to move towards the proximal end of the catheter body 10. Under the pulling action of the pulling member 23, the distal end of the catheter body 10 is bent, thereby changing the orientation of the aspiration port 16. At this time, the elastic member 24 is in a compressed state. During this process, since the action of the pulling member 23 only exists in the distal part of the catheter body 10, there is no reaction force on the proximal end of the catheter body 10. Therefore, after the distal end of the catheter body 10 is bent, the catheter body 10 can still move forward stably and normally, and the aspirated thrombus is discharged from the discharge port 42. When the suction is complete and the tube 10 is withdrawn, or when it is necessary to restore the tube 10 to its original state in other situations, simply evacuate the first chamber 211 through the air inlet 41. When the internal pressure of the first chamber 211 decreases, the moving part 22 returns to its original position under the action of the elastic part 24, and the distal end of the tube 10 will also return to its original state without any other force.

[0060] According to the aspiration catheter 1 of this embodiment, the orientation of the aspiration port 16 at the distal end of the aspiration catheter 1 can be changed to prevent the tube body 10 from adhering to the blood vessel wall during aspiration, thus avoiding vascular tearing and damage. At the same time, it avoids the "bowing" phenomenon of the entire tube body 10 under the force of the traction member, improving the stability of the tube body 10 in delivery and use, and also avoiding damage to healthy blood vessels.

[0061] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A suction catheter, characterized in that, include: The tube body has a first channel arranged axially upward inside the tube body; A traction assembly is disposed within the tube body; the traction assembly includes a fixed base, a movable component, and a traction component; wherein, the fixed base is fixedly disposed within the tube body and located near the distal end of the tube body, the fixed base has a pressure chamber, the movable component is movably placed within the fixed base and divides the pressure chamber into a first chamber and a second chamber, the first chamber or the second chamber is connected to a first channel, so as to change the pressure difference between the first chamber and the second chamber through the first channel, thereby causing the movable component to move; The distal end of the pulling member is connected to the distal end of the tube body, and the proximal end of the pulling member is connected to the moving member. The pulling member pulls or releases the tube body during the movement of the moving member.

2. The aspiration catheter according to claim 1, characterized in that, The proximal end of the traction member passes through the first chamber and is connected to the moving member. The first channel is an inflation channel and is connected to the first chamber, or the first channel is an exhaust channel and is connected to the second chamber.

3. The aspiration catheter according to claim 2, characterized in that, The pulling assembly further includes an elastic element, which is used to connect the fixed base and the moving element, and is used to restore the tube body to the released state; wherein, the elastic element is disposed in the first chamber and is in a stretched state during the pulling of the tube body by the pulling element; or the elastic element is disposed in the second chamber and is in a compressed state during the pulling of the tube body by the pulling element.

4. The aspiration catheter according to claim 3, characterized in that, The fixed base is further provided with a positioning boss inside. One end of the elastic element is sleeved on the outside of the positioning boss, and the other end of the elastic element is connected to the moving element.

5. The aspiration catheter according to any one of claims 1 to 4, characterized in that, The distance between the fixed seat and the far end opening of the tube is greater than or equal to 1 / 4 of the axial length of the tube and less than or equal to 1 / 2 of the axial length of the tube.

6. The aspiration catheter according to any one of claims 1 to 4, characterized in that, The traction assembly further includes a sleeve fixed inside the tube body. The traction member is sleeved inside the sleeve and can move axially relative to the sleeve. The distal end of the sleeve and the distal end of the traction member are connected to the distal end of the tube body. The proximal end of the traction member passes through the proximal end of the sleeve and is connected to the moving member.

7. The aspiration catheter according to any one of claims 1 to 4, characterized in that, The tube body includes an inner membrane layer, an intermediate layer, and an outer membrane layer arranged sequentially from the inside to the outside, and the fixing seat is disposed between the intermediate layer and the outer membrane layer.

8. The aspiration catheter according to any one of claims 1 to 4, characterized in that, The aspiration catheter also includes a second channel, which is connected to another of the first chamber and the second chamber, for balancing the pressure difference between the first chamber and the second chamber.

9. The aspiration catheter according to any one of claims 1 to 4, characterized in that, The distal end face of the tube is a wedge-shaped structure that is inclined relative to the axis of the tube, and the wedge angle of the wedge-shaped structure is 10° to 20°.

10. The aspiration catheter according to any one of claims 1 to 4, characterized in that, The suction catheter also includes a imaging element, which is disposed on the distal outer peripheral surface of the tube body, and the distal end of the pulling member is connected to the position on the tube body where the imaging element is disposed.

Images