A thrombus aspiration catheter

Abstract

This invention provides a thrombus aspiration catheter, belonging to the field of medical devices. It includes a catheter base and a catheter body. The catheter base contains a winding device. The catheter body, from the inside out, consists of an inner polymer tube, a middle support tube, and an outer polymer tube. 0-4 core wires are evenly distributed circumferentially inside the catheter body. One end of each core wire is fixedly connected to the winding device, and the other end is fixed to the distal end of the catheter body. The distal end of the outer polymer tube has a circumferentially expandable and contractible protrusion. This protrusion consists of a proximal protrusion, a middle protrusion, and a distal protrusion, connected sequentially from proximal to distal. Elastic spiral winding wires are disposed inside the proximal and distal protrusions. This invention allows for free and flexible adjustment of the catheter's advance angle by using core wires, and the protrusion reduces backflow, allowing the catheter body to still move even when the proximal end is blocked, thus reducing operational difficulty and improving aspiration efficiency.

Description

Technical Field

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

[0002] As people's living standards improve, the incidence of thrombotic diseases is increasing, which can block or completely interrupt blood flow. If such embolism occurs in cardiovascular and cerebrovascular vessels, it will cause serious consequences, ranging from disability to death. How to quickly and effectively eliminate these blockages is a problem that needs to be solved urgently by those skilled in the art.

[0003] In the prior art, a suction catheter is usually used to remove foreign matter such as thrombus in a blood vessel. The suction catheter is delivered to the thrombus site, and negative pressure is applied to the proximal end of the suction catheter to allow the thrombus and other foreign matter to be discharged from the body along the inner cavity of the catheter, thereby reestablishing blood circulation.

[0004] However, the current suction catheter cannot effectively reach the expected lesion location, the operation is cumbersome, the risk factor is high, and it does not have good suction efficiency, which is mainly reflected in the following aspects:

[0005] (1) In order to increase the visualization of the distal end, most existing suction catheters use a rigid visualization ring, which is usually fixed at the distal end by forging. The forged visualization ring is usually a polygon with edges and corners, which can cause two disadvantages. First, it can scratch the blood vessel wall or the inner wall of the matching catheter during advancement. Second, the thrombus aspirated can get stuck at the catheter tip, causing the operation to fail.

[0006] (2) Most of the existing suction catheters do not have a proximal blocking balloon, which causes most of the blood to be sucked from the proximal end, and the suction effect on the distal end cannot be guaranteed, resulting in an increase in the amount of blood drawn, which increases the patient's physical burden and requires the supplementation of allogeneic blood during the operation, which is inefficient, increases the operation time, and also increases the risk of the operation; and in the process of thrombus suction, the thrombus will inevitably break or fall off. If the ruptured small pieces of thrombus are not dealt with in time, it is very easy for them to flow with the blood to the narrower blood vessels at the distal end, causing unpredictable risks to the patient. If a balloon is added to block the proximal blood, only the blood at the distal end of the blocked section will be sucked during suction, so this risk will not occur. Therefore, the addition of balloons is very critical. However, a small number of products with balloons have poor suction effects on distal thrombi because the suction catheter cannot move forward and backward when the balloon is expanded, resulting in incomplete suction.

[0007] (3) In the prior art, during the operation, a guide wire, an intermediate catheter and a guide catheter are required to guide the suction catheter to the proximal end of the thrombus. During the suction process, the suction catheter moves back and forth in the blood vessel along the guide wire. The coordination between the catheters in the above process requires at least three hemostatic valves, which reduces the actual effective length of the catheter. In addition, the operation is cumbersome and complicated, and the hemostatic valve needs to be constantly adjusted.

[0008] (4) The suction catheter moves along the wall of the blood vessel, so the suction port of the suction catheter is also deviated from the center of the blood vessel, which causes the suction of the thrombus to be eccentric, resulting in incomplete suction of the thrombus.

[0009] (5) When aspirating thrombus in a tortuous blood vessel, the aspirated blood flow has a recoil effect on the catheter body itself. If there is a lack of effective support or fixation, it is very easy for the catheter to swing back and forth during aspiration, causing damage to the blood vessel. The swing amplitude may even be so large that the catheter is withdrawn from the target aspiration area, prolonging the operation time.

[0010] To facilitate the understanding of the technical problems to be solved by this application, the following is a specific analysis combined with some existing patent technologies:

[0011] Patent No. CN1893997A discloses a rapid exchange suction catheter, which increases the cross-sectional area of ​​the proximal lumen by adding a rapid exchange guidewire lumen at the distal end and removing the proximal guidewire lumen in the traditional design. However, this does not increase the inner diameter of the distal end of the suction catheter. On the contrary, the addition of the rapid exchange guidewire lumen increases the overall hardness of the distal end of the catheter and makes the flexibility uneven, resulting in poor permeability of complex anatomical structures and reduced suction performance.

[0012] Patent No. CN101389371A discloses a double-lumen suction catheter, which has a structure similar to that of patent CN1893997A. The improvement is that a bevel edge is added to the tip of the catheter, so that the suction catheter will not scratch the blood vessel when it moves along the guide wire. However, this design also causes the bevel edge section of the catheter tip to lose the support of the blood vessel wall, thereby being closer to the blood vessel wall and more eccentric. The effective suction area is compressed into a narrow triangular area, affecting the suction performance.

[0013] Patent Nos. CN108904006A, CN104984461A, and US7422579 disclose a multi-lumen suction catheter, which is provided with a balloon that can block blood flow, ensuring that the proximal end of the thrombus is blocked so that the suction force of the suction chamber can be concentrated on the thrombus. However, once the balloon is expanded, the catheter of this structure will be unable to move, so that the catheter cannot move during suction, which reduces the suction effect and makes it impossible to completely suction the thrombus at the distal end of the long blocked section; and this multi-lumen structure is not provided with a metal braided layer that can play a supporting role. When suction is performed, the balloon expansion cavity is in a positive pressure state, which will give the suction cavity a squeezing effect. At this time, the suction cavity is in a negative pressure state, which will increase the squeezing effect and make the suction cavity at risk of being flattened.

[0014] Patent No. CN102319097A discloses an aspiration catheter, which is equipped with a sleeve on the outside. The sleeve structure is similar to a coaxial integral exchange balloon catheter, which is equivalent to adding a double-lumen tube on the outside of the original aspiration catheter. Its pushing performance and passing performance cannot be compared with a single aspiration catheter, so it cannot reach the distal end of a blood vessel with a complex anatomical structure with the aspiration catheter, and its practical performance is reduced; and when this structure is pushed forward for aspiration in a blood vessel with a complex anatomical structure, the aspiration catheter will encounter resistance and cause it to bend backward and deform. Due to the interaction between the aspiration catheter and the sleeve, although the sleeve is fixed by a balloon, the balloon is easier to slide proximally due to the larger size of the proximal blood vessel. In addition, there is a probability that the sleeve will be withdrawn, the sealing effect disappears, and the operation time is prolonged. Summary of the invention

[0015] In view of the above problems, the present invention provides a thrombus aspiration catheter.

[0016] The purpose of the present invention is achieved by the following technical solutions:

[0017] A thrombus aspiration catheter, comprising a catheter seat, a stress release tube and a catheter body, wherein the catheter seat is connected to the catheter body via the stress release tube; a stamping cavity and a suction cavity are arranged at the proximal end of the catheter seat, and the catheter seat is characterized in that a wire winder is arranged inside the catheter seat, and the catheter body is composed of an inner polymer tube, a middle support tube and an outer polymer tube from the inside to the outside, wherein the middle support tube is a braided tube or a winding tube or a connection or superposition of the two, and 0-4 core wires are evenly distributed in the circumferential direction inside the catheter body, and one end of the core wire is fixedly connected to the wire winding device. The outer polymer tube is composed of a plurality of sections of catheters with increasing flexibility from the proximal end to the distal end, the outer polymer tube is coated with a hydrophilic coating from the distal end, and the distal end of the outer polymer tube is provided with a convex section that can expand and contract circumferentially, and the convex section is composed of a proximal end of the convex section, a middle part of the convex section and a distal end of the convex section that are connected in sequence from the proximal end to the distal end, and an elastic spiral winding wire is provided inside the proximal end of the convex section and the distal end of the convex section;

[0018] The inner polymer tube is made of a material with a low friction coefficient, the braided tube and the winding tube are made of a high elastic alloy material, the braided tube is in a grid shape, and the winding tube is in a spiral shape, and is arranged as an intermediate layer between the inner and outer polymer tubes. The middle support tube can be a braided mesh tube, a winding mesh tube, or a combination of the two.

[0019] The core wire is a metal or polymer wire with high toughness and high compliance, and the number of core wires is 0-4. The catheter body itself has good flexibility. According to specific needs, the direction may not be controlled and no core wire may be added to enhance the flexibility of the product. A flexible braiding and / or winding ring is provided at the distal end of the catheter body as a developing ring, which is braided / wound by a highly elastic and radiopaque alloy material. The elastic spiral winding wire is made of a highly elastic alloy material.

[0020] As the compliance of the distal material selected for the outer polymer tube changes, the convex height of the convex section ranges from 0 to 10 mm. When the convex section adopts a super-compliant material, the convex height is close to 0 mm, and at this time, the two ends thereof tend to be straightened;

[0021] Compliance refers to the ease with which an elastomer can deform under the action of an external force. The greater the compliance of an elastomer, the greater its deformation ability, that is, it can cause greater deformation under the action of a smaller external force.

[0022] Preferably, the inner wall of the catheter seat is provided with a plurality of toothed grooves, the wire winder comprises a turntable, a lever, a reset spring, a core wire fixing hole, a threaded hole and a core wire fixing screw, the turntable is rotatably fixedly connected to the catheter seat via a rotating shaft, a winding column is provided at the center of the turntable, a core wire fixing hole is opened on the turntable, a threaded hole is provided on the vertical hole wall of the core wire fixing hole, a core wire fixing screw is provided in the threaded hole, a lever groove is provided inside the turntable, a reset spring and a lever are provided in the lever groove, and a boss which can be separated / matched with the toothed groove is provided on the lever.

[0023] Further preferably, the cross-section of the winding pole is circular or elliptical.

[0024] Further preferably, two core wires are evenly distributed along the circumferential direction inside the catheter body.

[0025] Preferably, the core wire is arranged between the inner polymer tube and the outer polymer tube of the catheter body.

[0026] Preferably, the core wire is arranged in a core wire cavity, and the core wire cavity is arranged on the tube wall of the inner polymer tube or the outer polymer tube.

[0027] Preferably, the core wire gradually tapers from the proximal end to the distal end, and the median diameter of the core wire is 0.1 mm.

[0028] Preferably, 0-4 reinforcing fibers are arranged inside the catheter body, and the reinforcing fibers are compounded with the inner polymer tube or compounded with the outer polymer tube or arranged between the inner polymer tube and the outer polymer tube;

[0029] The reinforcing fiber is a polymer material with high flexibility and high tensile strength.

[0030] Preferably, the length of the tube body of the hydrophilic coating coated portion of the outer polymer tube is 0-100 cm.

[0031] Preferably, the inner tube surface in the middle of the raised section is provided with 0-4 linear alloy materials parallel to the catheter body.

[0032] The beneficial effects of the present invention are:

[0033] (1) The design of the flexible braided / wrapped developing ring can increase the flexibility of the distal end while ensuring that the distal end does not collapse, thereby improving the passability of the catheter; compared with the traditional forging ring, it will not cause any damage to the catheter body, the diameter is more uniform and will not produce deformities, avoiding damage to the blood vessel or the inner wall of the matching catheter caused by deformed edges and corners, and also avoiding obstacles to thrombus aspiration.

[0034] (2) The middle layer support of the catheter body adopts braided / wrapped metal wire, which can provide strong support for the catheter during the advancement process, so that no guide wire is required during the preparation process. The operator can freely and flexibly adjust the advancement angle of the catheter by operating the winding device to adjust the core wire in the catheter body until it enters the target blood vessel, which reduces the difficulty of operation and saves operation time. In addition, during suction, the core wire can be adjusted so that the suction port is directly facing the center of the embolism, thereby increasing the suction effect, reducing the patient's blood loss, and saving operation time.

[0035] (3) The raised section at the distal end can expand during punching, which can effectively block the proximal blood flow, so that the suction force is concentrated at the embolism site, thereby increasing the suction effect, reducing the patient's blood loss, and effectively preventing the broken plaque from flowing to the distal blood vessel; and the raised section can also support and fix the catheter body during suction, thereby reducing the backwash effect during suction; when the raised section expands, the middle part of the raised section is stuck and does not move, pushing the catheter body. At this time, the outer polymer tube gives a thrust to the proximal end of the raised section, and the spirally wrapped wire at the proximal end of the raised section contracts, and then the length of the inner polymer tube becomes relatively longer and moves toward the distal end, and at the same time, it will drive the spirally wrapped wire at the distal end of the raised section to extend, so that the catheter body can still move forward and backward when the raised section expands, thereby completing the suction of the thrombus at the distal end of the long blocked section and improving the suction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0037] Figure 1 is a schematic diagram of the overall structure of the thrombus aspiration catheter of the present invention;

[0038] Figure 2 is a front view of the catheter adapter of the present invention;

[0039] Figure 3 is a three-dimensional diagram of the catheter seat of the present invention

[0040] Figure 4 is a schematic diagram of the back side of the turntable of the present invention;

[0041] Figure 5 is a cross-sectional view of the turntable of the present invention;

[0042] Figure 6 is a schematic structural diagram of the lever of the present invention;

[0043] Figure 7 is a cross-sectional view of a catheter body according to the present invention;

[0044] Figure 8 It is a schematic diagram of the connection between the braided tube and the winding tube of the present invention;

[0045] Fig. 9 is a schematic structural diagram of the flexible developing ring of the present invention;

[0046] Fig.10 , Fig.11 is a schematic structural diagram of the convex section of the present invention;

[0047] Fig.12 , Fig.13 It is a schematic diagram of the principle of the catheter body changing the forward angle when the wire winder of the present invention is in winding operation;

[0048] Fig.14 , Fig.15 It is a schematic diagram of the principle of the catheter body moving forward when the raised section expands according to the present invention.

[0049] Reference numerals:

[0050] 1-catheter seat; 2-stress release tube; 3-catheter body; 4-core wire; 5-turntable; 6-rotating axis; 7-push rod; 8-push rod groove; 9-toothed groove; 10-suction chamber; 11-punching chamber; 12-winder; 13-winding column; 14-core wire fixing hole; 15-threaded hole; 16-core wire fixing screw; 17-reset spring; 18-boss; 19-inner polymer tube; 20-middle support tube; 21-outer polymer tube; 22-braided tube; 23-winding tube; 24-proximal end of raised section; 25-middle part of raised section; 26-distal end of raised section; 27-helical winding wire at proximal end of raised section; 28-helical winding wire at distal end of raised section; 29-extended core wire, 30-tightened core wire, 31-extended spiral winding wire, 32-compressed spiral winding wire. DETAILED DESCRIPTION

[0051] The present invention is further described in conjunction with the following examples.

[0052] Reference Figure 1-15The embodiment of the present invention relates to a thrombus aspiration catheter, comprising a catheter seat 1, a stress release tube 2 and a catheter body 3, wherein the catheter seat 1 is connected to the catheter body 3 through the stress release tube 2; a stamping cavity 11 and a suction cavity 10 are arranged at the proximal end of the catheter seat 1, a wire winder 12 is arranged inside the catheter seat 1, and the catheter body 3 is composed of an inner polymer tube 19, a middle support tube 20 and an outer polymer tube 21 from the inside to the outside, wherein the middle support tube 20 is a braided tube 22 or a winding tube 23 or a connection or superposition of the two, and 0-4 core wires 4 are evenly distributed in the circumferential direction inside the catheter body 3, and one end of the core wire 4 is fixed The outer polymer tube 21 is connected to the winding device 12, and the other end is fixed to the distal end of the catheter body 3; the distal end of the catheter body 3 is provided with a flexible braiding and / or winding ring; the outer polymer tube 21 is composed of a plurality of sections of catheters whose flexibility increases from the proximal end to the distal end, the outer polymer tube 21 is coated with a hydrophilic coating from the distal end, and the distal end of the outer polymer tube 21 is provided with a convex section that can expand and contract circumferentially, and the convex section is composed of a convex section proximal end 24, a convex section middle part 25 and a convex section distal end 26 that are connected in sequence from the proximal end to the distal end, and the proximal end 24 and the distal end 26 of the convex section are provided with elastic spiral winding wires inside;

[0053] The winding device 12 can effectively shorten or stretch the length of the core wire 4 during the winding process, thereby regulating the tension and relaxation of the core wire 4;

[0054] The inner wall of the catheter seat 1 is provided with a plurality of toothed grooves 9, the wire winder 12 comprises a turntable 5, a lever 7, a reset spring 17, a core wire fixing hole 14, a threaded hole 15 and a core wire fixing screw 16, the turntable 5 is rotatably fixedly connected to the catheter seat 1 through a rotating shaft 6, a winding post 13 is provided at the center of the turntable 5, a core wire fixing hole 14 is provided on the turntable, a threaded hole 15 is provided on a vertical hole wall of the core wire fixing hole 14, a core wire fixing screw 16 is provided in the threaded hole 15, a lever groove 8 is provided inside the turntable, a reset spring 17 and a lever 7 are provided in the lever groove 8, and a boss 18 which can be separated from / matched with the toothed groove 9 is provided on the lever 7;

[0055] One end of the core wire 4 passes through the core wire fixing hole 14 and the threaded hole 15 provided on the turntable 5 and is fixed to the turntable 5 by the core wire fixing screw 16. A lever groove 8 is provided in the turntable 5, and a return spring 17 and a lever 7 are provided in the lever groove 8. The turntable 5 can be rotated by pressing and toggling the lever 7, thereby driving the wire winder 12 to wind the wire and realize the regulation of the core wire 4; a boss 18 is provided on the lever 7, which is separated and matched with the toothed groove 9 in the catheter seat 1 by the operator's pressing and the action of the return spring 17 in the turntable 5. When the lever 7 is pressed, the boss 18 on the lever 7 is separated from the toothed groove 9, and the turntable 5 can adjust the rotation angle through the lever 7. When the lever 7 is released, the lever 7 restores the cooperation between the boss 17 on the lever 7 and the toothed groove 9 under the action of the return spring 17. At this time, the turntable is locked and cannot be rotated, thereby realizing unlocking and locking;

[0056] The working principle of the thrombus aspiration catheter of the present invention is as follows: during operation, the lever 7 is pressed, and at this time, the boss 18 on the lever 7 is separated from the toothed groove 9 in the catheter seat 1, and the lever 7 can drive the turntable 5 to rotate; when the turntable 5 rotates, the winder 12 thereon starts to wind the wire, and since the two core wires 4 are distributed on both sides of the winder 12, when the core wire 4 on one side is wound on the winding column 13, the overall axial length of the core wire 4 is shortened due to the winding, and the core wire on the other side releases part of the previously wound length, and the overall axial length is extended, thereby driving the extension or tightening of the distal end of the core wire 4, so that the distal end of the catheter body 3 bends toward the side where the core wire 4 is tightened, thereby changing the front of the catheter body 3 Advance angle; when the middle part 25 of the raised section expands, it will be fixed in the blood vessel wall and remain motionless. At this time, the catheter is pushed forward, and the outer polymer tube 21 of the catheter will be squeezed by force on the proximal end 24 of the raised section, and the highly elastic proximal spiral winding wire 27 of the raised section is compressed, so that the length of the inner polymer tube 19 becomes relatively longer, so it will move toward the distal end. Since the distal end of the inner polymer tube 19 is connected to the distal end of the outer polymer tube 21, the inner polymer tube 19 will drive the distal end 26 of the raised section to stretch while moving toward the distal end, and the highly elastic distal winding wire 28 of the raised section is stretched, thereby realizing the displacement of the catheter body when the middle part 25 of the raised section expands.

[0057] Example 1

[0058] A thrombus aspiration catheter comprises a catheter seat, a stress release tube and a catheter body, wherein the catheter seat is connected to the catheter body via the stress release tube; a stamping cavity and a suction cavity are arranged at the proximal end of the catheter seat, a wire winder is arranged inside the catheter seat, and the catheter body is composed of an inner polymer tube, a middle support tube and an outer polymer tube from the inside to the outside, wherein the middle support tube is a braided tube or a winding tube or a connection or superposition of the two, and two core wires are evenly distributed in the circumferential direction inside the catheter body, wherein the core wires are arranged in a core wire cavity, and the core wire cavity is arranged on the tube wall of the inner polymer tube or the outer polymer tube, and one end of the core wire is fixed The outer polymer tube is connected to the wire winder, and the other end is fixed to the distal end of the catheter body; the distal end of the catheter body is provided with a flexible braiding and / or winding ring; the outer polymer tube is composed of multiple sections of catheters with increasing flexibility from the proximal end to the distal end, the outer polymer tube is coated with a hydrophilic coating from the distal end, the length of the tube body of the hydrophilic coating coating part is 100 cm, the distal end of the outer polymer tube is provided with a convex section that can expand and contract circumferentially, the convex section is composed of a proximal end of the convex section, a middle part of the convex section and a distal end of the convex section that are connected in sequence from the proximal end to the distal end, and the proximal end of the convex section and the distal end of the convex section are provided with elastic spiral winding wires;

[0059] The inner wall of the catheter seat is provided with a plurality of tooth-shaped grooves, and the wire winder includes a turntable, a lever, a reset spring, a core wire fixing hole, a threaded hole and a core wire fixing screw. The turntable is rotatably fixedly connected to the catheter seat through a rotating shaft, and a winding column with an elliptical cross-section is provided at the center of the turntable. The turntable is provided with a core wire fixing hole, and a threaded hole is provided on the vertical hole wall of the core wire fixing hole. A core wire fixing screw is provided in the threaded hole, and a lever groove is provided inside the turntable, and a reset spring and a lever are provided in the lever groove, and a boss that can be separated / matched with the tooth-shaped groove is provided on the lever.

[0060] Example 2

[0061] A thrombus aspiration catheter comprises a catheter seat, a stress release tube and a catheter body, wherein the catheter seat is connected to the catheter body via the stress release tube; a stamping cavity and a suction cavity are arranged at the proximal end of the catheter seat, a wire winder is arranged inside the catheter seat, and the catheter body is composed of an inner polymer tube, a middle support tube and an outer polymer tube from the inside to the outside, wherein the middle support tube is a braided tube or a winding tube or a connection or superposition of the two, and two core wires are evenly distributed along the circumferential direction inside the catheter body, wherein the core wires gradually become thinner from the proximal end to the distal end, and the median diameter thereof is 0.1 mm, and the core wires are arranged in the gap between the inner polymer tube and the outer polymer tube of the catheter body, One end of the core wire is fixedly connected to the wire winder, and the other end is fixed to the distal end of the catheter body; a flexible braiding and / or winding ring is arranged at the distal end of the catheter body; the outer polymer tube is composed of a plurality of sections of catheters whose flexibility increases successively from the proximal end to the distal end, the outer polymer tube is coated with a hydrophilic coating starting from the distal end, the length of the tube body of the hydrophilic coating coating portion is 100 cm, a convex section that can expand and contract circumferentially is arranged at the distal end of the outer polymer tube, the convex section is composed of a proximal end of the convex section, a middle part of the convex section and a distal end of the convex section that are connected in sequence from the proximal end to the distal end, and an elastic spiral winding wire is arranged inside the proximal end of the convex section and the distal end of the convex section;

[0062] 0-4 reinforcing fibers are arranged inside the catheter body, and the reinforcing fibers are compounded with the inner polymer tube or compounded with the outer polymer tube or arranged between the inner polymer tube and the outer polymer tube; 0-4 linear alloy materials parallel to the catheter body are arranged on the inner tube surface in the middle of the raised section;

[0063] The inner wall of the catheter seat is provided with a plurality of tooth-shaped grooves, and the wire winder includes a turntable, a lever, a reset spring, a core wire fixing hole, a threaded hole and a core wire fixing screw. The turntable is rotatably fixedly connected to the catheter seat through a rotating shaft, and a winding column with a circular cross-section is provided at the center of the turntable. The turntable is provided with a core wire fixing hole, and a threaded hole is provided on the vertical hole wall of the core wire fixing hole. A core wire fixing screw is provided in the threaded hole, and a lever groove is provided inside the turntable, and a reset spring and a lever are provided in the lever groove, and a boss that can be separated / matched with the tooth-shaped groove is provided on the lever.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A thrombus aspiration catheter, comprising a catheter seat, a stress release tube and a catheter body, wherein the catheter seat is connected to the catheter body through the stress release tube; a stamping cavity and a suction cavity are provided at the proximal end of the catheter seat, characterized in that: A wire winder is arranged in the catheter seat, and the catheter body is composed of an inner polymer tube, a middle support tube and an outer polymer tube from the inside to the outside, the middle support tube is a braided tube or a winding tube or a connection or superposition of the two, and 0-4 core wires are evenly distributed in the circumferential direction inside the catheter body, one end of the core wire is fixedly connected to the wire winder, and the other end is fixed to the distal end of the catheter body; a flexible braiding and / or winding ring is arranged at the distal end of the catheter body; the outer polymer tube is composed of a plurality of sections of catheters with increasing flexibility from the proximal end to the distal end, the outer polymer tube is coated with a hydrophilic coating from the distal end, and a circumferentially expandable and contractible protruding section is arranged at the distal end of the outer polymer tube, and the proximal end of the protruding section, the middle part of the protruding section and the distal end of the protruding section are connected in sequence from the proximal end to the distal end, and elastic spiral winding wires are arranged inside the proximal end of the protruding section and the distal end of the protruding section.

2. A thrombus aspiration catheter according to claim 1, characterized in that: The inner wall of the catheter seat is provided with a plurality of tooth-shaped grooves, and the wire winder includes a turntable, a lever, a reset spring, a core wire fixing hole, a threaded hole and a core wire fixing screw. The turntable is rotatably fixedly connected to the catheter seat through a rotating shaft, a winding column is provided at the center of the turntable, a core wire fixing hole is opened on the turntable, a threaded hole is provided on the vertical hole wall of the core wire fixing hole, a core wire fixing screw is provided in the threaded hole, a lever groove is provided inside the turntable, a reset spring and a lever are provided in the lever groove, and a boss which can be separated / matched with the tooth-shaped groove is provided on the lever.

3. A thrombus aspiration catheter according to claim 2, characterized in that: The cross section of the winding pole is circular or elliptical.

4. A thrombus aspiration catheter according to claim 1, characterized in that: Two core wires are evenly distributed in the circumferential direction inside the catheter body.

5. The thrombus aspiration catheter according to claim 1, characterized in that: The core wire is arranged between the inner polymer tube and the outer polymer tube of the catheter body.

6. The thrombus aspiration catheter according to claim 1, characterized in that: The core wire is arranged in a core wire cavity, and the core wire cavity is arranged on the tube wall of the inner polymer tube or the outer polymer tube.

7. The thrombus aspiration catheter according to claim 1, characterized in that: The core wire gradually becomes thinner from the proximal end to the distal end, and the median diameter of the core wire is 0.1 mm.

8. The thrombus aspiration catheter according to claim 1, characterized in that: 0-4 reinforcing fibers are arranged inside the catheter body, and the reinforcing fibers are compounded with the inner polymer tube or compounded with the outer polymer tube or arranged between the inner polymer tube and the outer polymer tube.

9. The thrombus aspiration catheter according to claim 1, characterized in that: The length of the tube body of the hydrophilic coating coating portion of the outer polymer tube is 0-100 cm.

10. The thrombus aspiration catheter according to claim 1, characterized in that: The inner tube surface in the middle of the raised section is provided with 0-4 linear alloy materials parallel to the catheter body.

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