Thrombectomy stent, thrombectomy device and thrombectomy equipment

Abstract

The invention relates to the technical field of medical equipment, and provides a thrombectomy stent, a thrombectomy device and a thrombectomy device.The thrombectomy stent comprises a bare stent body and a plurality of heat shrink tubes, the bare stent body comprises a stent lantern ring and a plurality of stent branch rods, one ends of the stent branch rods are connected with the stent lantern ring, each stent branch rod extends in an arc shape, and the other ends of the stent branch rods are connected with the heat shrink tubes; a fusiform three-dimensional frame with a wide middle part and two narrow ends is formed by the plurality of bracket branch rods in the extension direction of the bracket branch rods; each heat shrink tube is sleeved on one support branch rod, and a flocking layer is arranged on the outer surface of each heat shrink tube. According to the thrombectomy stent, damage of the thrombectomy stent to blood vessels is reduced by using a simpler fusiform three-dimensional frame structure, meanwhile, the stent branch rods on the surface are sleeved with the heat shrink tubes, the outer surfaces of the heat shrink tubes are covered with the flocking layers, the thrombus capturing and adsorbing capacity is improved, and meanwhile protection on the blood vessel walls is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a thrombus removal stent, a thrombus removal device and a thrombus removal apparatus. Background Art

[0002] Thrombectomy stents are used to treat vascular stenosis. During interventional procedures, stent retrievers physically capture and grasp intravascular clots and remove them from the body. This therapeutic device can quickly restore blood flow distal to the blocked vessel. Compared to traditional catheter-based or systemic thrombolysis treatments, stent retrievers offer advantages such as high efficiency and patency rates, making them a commonly used device in clinical practice for treating vascular stenosis.

[0003] In related technologies, thrombectomy stents are usually made of highly elastic nickel-titanium shape memory alloy tubes. Laser engraving technology is used to hollow out the nickel-titanium tubes, and then heat treatment and electrochemical polishing are performed to form the final thrombectomy stent product. This type of product has the following disadvantages: 1. In order to ensure the capture efficiency of the thrombectomy stent, the thrombectomy stent is usually designed with a relatively complex hollow structure. This complex hollow structure will cause damage to the vascular endothelium during the thrombectomy process, leading to restenosis after the diseased blood vessels are recanalized; 2. The sharp cutting edges also pose potential risks to blood vessels, which may cause common clinical complications such as vascular endothelial damage, small blood vessel penetration and rupture, and vascular valve damage. 3. The thrombectomy stent has a weak ability to capture and adsorb thrombi. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a thrombus removal stent that is designed to improve the ability to capture and adsorb thrombi and reduce damage to the vascular endothelium and valves caused by the thrombus removal stent.

[0005] The present invention also provides a thrombus removal device.

[0006] The present invention also provides a thrombus removal device.

[0007] According to the first embodiment of the present invention, the thrombus removal stent comprises: A bare stent, comprising a stent collar and a plurality of stent branches, one end of each of the stent branches being connected to the stent collar, each of the stent branches extending in an arc shape, and the plurality of stent branches forming a three-dimensional fusiform frame in the direction of their extension that is wide in the middle and narrow at both ends; A plurality of heat shrink tubes are provided, each of which is sleeved on one of the support rods, and the outer surface of each heat shrink tube is provided with a flocking layer.

[0008] According to the embodiment of the present invention, the thrombus removal stent reduces the damage to the blood vessel by using a relatively simple spindle-shaped three-dimensional frame structure. At the same time, a heat shrink tube is provided on the surface of the stent branch sleeve, and the outer surface of the heat shrink tube is covered with a flocking layer with adsorption ability for thrombus, thereby improving the ability to capture and adsorb thrombus while enhancing the protection of the blood vessel wall.

[0009] According to one embodiment of the present invention, a plurality of the stent branches extend in a spiral shape.

[0010] According to one embodiment of the present invention, the support branch includes a main body section and a connecting section connected to each other, one end of the main body section is connected to the support ring, the heat shrink tube is sleeved on the main body section, and the connecting section is provided at one end of the main body section away from the support ring.

[0011] The thrombus removal device according to the second embodiment of the present invention comprises: A connecting component, comprising a thrombus removal tube seat and a loading tube seat; a loading conduit connected to the loading tube seat; A thrombectomy catheter, which is passed through the loading catheter and is adapted to extend or retract from the loading catheter. The thrombectomy catheter is provided with a suction port and is connected to the thrombectomy tube base. The above-mentioned thrombectomy stent, wherein the stent collar is sleeved on the thrombectomy catheter; A stent fixing ring, one end of the stent branch away from the stent collar is connected to the stent fixing ring, and the stent fixing ring is sleeved on the thrombectomy catheter.

[0012] According to one embodiment of the present invention, the stent collar is fixedly sleeved on the thrombectomy catheter, and the stent fixing ring is slidably sleeved on the thrombectomy catheter.

[0013] According to one embodiment of the present invention, the thrombus removal device includes a plurality of thrombus removal stents, and the plurality of thrombus removal stents are arranged at intervals on the thrombus removal catheter.

[0014] According to one embodiment of the present invention, one suction port is provided between every two adjacent thrombus removal stents.

[0015] According to one embodiment of the present invention, the thrombus removal device includes a tip structure, and the tip structure is sleeved on the end of the thrombus removal catheter away from the connecting component.

[0016] The thrombus removal device according to an embodiment of the present invention includes the above-mentioned thrombus removal bracket, and thus has all the technical effects of the above-mentioned thrombus removal bracket, which will not be described in detail here.

[0017] The thrombus removal device according to the third embodiment of the present invention includes a suction device and the above-mentioned thrombus removal device, wherein the thrombus removal tube seat of the thrombus removal device is connected to the suction device.

[0018] The thrombus removal device according to an embodiment of the present invention includes the above-mentioned thrombus removal device, and thus has all the technical effects of the above-mentioned thrombus removal device, which will not be described in detail here.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of a bare stent provided in an embodiment of the present invention.

[0022] Figure 2 FIG. 4 is a schematic structural diagram of a thrombus removal stent provided in an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the electrostatic flocking process of the heat shrink tubing provided by an embodiment of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the bracket ring provided in an embodiment of the present invention.

[0025] Figure 5 FIG. 4 is a schematic structural diagram of a thrombus removal stent provided in another embodiment of the present invention.

[0026] Figure 6 2 is a schematic structural diagram of a thrombus removal device provided in an embodiment of the present invention.

[0027] Figure 7 FIG2 is a partial structural diagram of a thrombus removal device provided in an embodiment of the present invention.

[0028] Figure 8 2 is a schematic cross-sectional view of a thrombus removal device provided in an embodiment of the present invention.

[0029] Reference numerals: 1. Thrombectomy bracket; 11. Bracket collar; 12. Bracket rod; 13. Heat shrink tubing; 14. Flocking layer; 15. Bracket fixing ring; 151. Welding groove; 2. Connecting parts; 21. Loading tube seat; 22. Thrombectomy tube seat; 3. Loading catheter; 4. Thrombectomy catheter; 41. Suction port; 5. Tip structure. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0033] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0035] Please refer to Figures 1 to 5 According to the first embodiment of the present invention, the thrombus removal bracket 1 includes a bare bracket and multiple heat shrink tubes 13. The bare bracket includes a bracket ring 11 and multiple bracket branches 12. One end of the multiple bracket branches 12 is connected to the bracket ring 11. Each bracket branch 12 extends in an arc shape. The multiple bracket branches 12 form a shuttle-shaped three-dimensional frame with a wide middle and narrow two ends in the extension direction; each heat shrink tube 13 is sleeved on a bracket branch 12, and the outer surface of each heat shrink tube 13 is provided with a flocking layer 14.

[0036] According to the embodiment of the present invention, the thrombus removal stent 1 reduces the damage to the blood vessel by the thrombus removal stent 1 by using a relatively simple spindle-shaped three-dimensional frame structure. At the same time, a heat shrink tube 13 is provided on the surface of the stent branch rod 12, and the outer surface of the heat shrink tube 13 is covered with a flocking layer 14, which improves the ability to capture and adsorb thrombi while enhancing the protection of the blood vessel wall.

[0037] like Figure 1 As shown, the bare stent, serving as the underlying support structure for the entire stent, is ingeniously designed to adapt to the complex anatomical structure within the blood vessel. In one embodiment, the bare stent is fabricated from nickel-titanium shape memory alloy tubing through a process of laser cutting, heat treatment, sandblasting, and electrochemical polishing. The stent collar 11 is a key component of the bare stent, not only securing and connecting the stent branches 12 but also ensuring the stability of the bare stent within the blood vessel.

[0038] In one embodiment, the stent collar 11 and the plurality of stent branches 12 are integrally formed, and the ends of the plurality of stent branches 12 away from the stent collar 11 are open structures to facilitate insertion of the heat shrink tube 13. Optionally, the thrombus removal stent 1 includes a stent fixing ring 15, which is connected to the ends of the plurality of stent branches 12 away from the stent collar 11 to limit the heat shrink tube 13. Exemplarily, a plurality of welding grooves 151 are spaced apart on the end face of the stent fixing ring 15. Specifically, the plurality of stent branches 12 are evenly distributed along the circumference of the end face of the stent fixing ring 15 at the plurality of welding grooves 151 for connection. The stent fixing ring 15 and the stent branches 12 are made of the same material to ensure good welding performance. Furthermore, the width of the welding groove 151 is slightly larger than the width of the stent branch 12 to facilitate installation.

[0039] One end of a number of stent branches 12 is firmly connected to the stent collar 11, and these stent branches 12 are processed into an arc shape by heat treatment, so that they form a fusiform three-dimensional frame in the extension direction that is wide in the middle and narrow at both ends. First, the design of wide in the middle can increase the contact area between the stent and the thrombus, and improve the adsorption capacity of the thrombus. Secondly, the structure with narrow ends helps to reduce the space occupied by the thrombus removal stent 1 in the blood vessel, reduce the stimulation and damage to the blood vessel wall, and increase the anchoring ability of the thrombus. During the pullback process, the thrombus is not easy to escape. In addition, the arc-shaped extended stent branches 12 can better conform to the bends and branches of the blood vessel, so that the thrombus removal stent 1 maintains good fit in the blood vessel, ensuring its stability and effectiveness during the thrombus removal process.

[0040] like Figure 2 As shown, each stent branch 12 is covered with a heat shrink tube 13. The heat shrink tube 13 is made of high-quality biocompatible material with good flexibility and durability. During the installation process, the heat shrink tube 13 is tightly fitted on the stent branch 12 through a precise heat shrinking process to ensure that there is no gap between the two, thus forming an integral structure. Please refer to Figure 2 and Figure 3 The outer surface of the heat shrink tubing 13 is covered with a flocking layer 14 made of a special fiber material with excellent adsorption properties. The fiber structure of the flocking layer 14 effectively absorbs blood clots, which is due to the microstructure and chemical properties of the fiber surface. The tiny hairs on the fiber surface increase the contact area with the blood clot, firmly fixing the blood clot to the flocking layer 14 through physical adsorption. In addition, the softness of the flocking layer 14 can reduce damage to the blood vessel wall when the stent moves within the blood vessel, thereby protecting the blood vessel wall.

[0041] During a thrombectomy procedure, stent retriever 1 is first delivered via a catheter to the location of the thrombus. Once it reaches the target location, it is released and deployed within the vessel. The fusiform three-dimensional framework of stent retriever 1 allows it to quickly adapt to the shape of the vessel. The curved design of stent branches 12 ensures a close fit with the vessel wall without excessive pressure.

[0042] When the flocking layer 14 comes into contact with the thrombus, its adsorption properties begin to work. The adsorption effect of the tiny villi on the fiber surface can quickly grab the thrombus and fix it on the flocking layer 14. With the slight movement of the thrombus removal stent 1 and the impact of the blood flow, the flocking layer 14 can continue to adsorb the thrombus to prevent the thrombus from escaping. During the thrombus removal process, the fusiform three-dimensional frame structure of the thrombus removal stent 1 provides sufficient support force to ensure that the thrombus removal stent 1 will not be deformed or displaced after adsorbing the thrombus. After the thrombus adsorption is completed, the thrombus removal stent 1 is slowly withdrawn through the catheter. Due to the firm adsorption of the thrombus by the flocking layer 14, the thrombus will be taken out of the blood vessel together with the thrombus removal stent 1. Throughout the process, the softness of the heat shrink tube 13 and the flocking layer 14 reduces damage to the blood vessel wall, ensuring the safety and effectiveness of the thrombus removal process.

[0043] According to one embodiment of the present invention, a number of stent branches 12 extend in a spiral shape. It is understandable that the fusiform three-dimensional frame structure of the thrombectomy stent 1 enables it to quickly adapt to the shape of the blood vessel, and the spiral stent branches 12 ensure that it fits tightly with the blood vessel wall without excessively compressing the blood vessel wall. The spiral structure can provide a larger surface area, thereby increasing the contact area with the thrombus and improving the adsorption capacity of the thrombus. Secondly, the spiral design helps the thrombectomy stent 1 to better conform to the bends and branches of the blood vessel in the blood vessel, so that the thrombectomy stent 1 maintains good fit in the blood vessel, ensuring its stability and effectiveness during the thrombectomy process. In addition, compared with the stent branches 12 extending in an axial arc along the blood vessel, the spiral stent branches 12 can form a certain anchoring effect in the blood vessel, and the spirally extended stent branches 12 can more effectively prevent the thrombectomy stent 1 from shifting or falling off during the thrombectomy process.

[0044] According to one embodiment of the present invention, the support branch rod 12 includes a main body section and a connecting section connected to each other, one end of the main body section is connected to the support collar 11, the heat shrink tube 13 is sleeved on the main body section, and the connecting section is provided at the end of the main body section away from the support collar 11. It can be understood that the connecting section is not covered by the heat shrink tube 13 to facilitate connection and fixation with external components. Optionally, both ends of the main body section are provided with connecting sections, so that the connecting section can also be welded to the support collar 11 for easy operation. Figure 5As shown, for example, a support collar 11 is connected to both ends of the support branch rod 12 to facilitate the fixing of multiple support branches 12. The support collar 11 can facilitate the connection of the shuttle-shaped three-dimensional frame formed by the multiple support branches 12 to an external component, such as being connected and fixed to a catheter. During installation, one end of the multiple support branches 12 can be connected to a support collar 11 first, and then the heat shrink tube 13 is passed through the other end of the support branch rod 12 into the support branch rod 12, and a heat shrink operation is performed to ensure that there is no gap between the two, thereby forming an integral structure. Then, the multiple support branches 12 can be twisted to form a spiral structure, and the support branches 12 are twisted spirally along the central axis of the support collar 11, with the number of twisting turns being 1 to 5 turns. Optionally, the support branches 12 and the support collar 11 are an integrated structure.

[0045] like Figure 6 As shown, the thrombectomy device according to the second embodiment of the present invention includes a connecting component 2, a loading catheter 3, a thrombectomy catheter 4, the above-mentioned thrombectomy bracket 1 and a bracket fixing ring 15, the loading catheter 3 is arranged on the connecting component 2; the thrombectomy catheter 4 is passed through the loading catheter 3 and is suitable for extending or retracting in the loading catheter 3, and the thrombectomy catheter 4 is provided with a suction port 41; the bracket collar 11 is sleeved on the thrombectomy catheter 4; the end of the bracket branch rod 12 away from the bracket collar 11 is connected to the bracket fixing ring 15, and the bracket fixing ring 15 is sleeved on the thrombectomy catheter 4.

[0046] In this embodiment, the connecting component 2 serves as the interface for the device, connecting to a loading catheter 3 and other external devices (such as a suction pump). The loading catheter 3 is mounted on the connecting component 2 and serves as the outer layer of the device, used to load and protect the thrombectomy stent 1. The thrombectomy catheter 4 is inserted into the loading catheter 3 and can move axially along the loading catheter 3, thereby extending or retracting from the loading catheter 3. The thrombectomy catheter 4 is provided with a suction port 41 for aspirating thrombus or blood. The thrombectomy stent 1 comprises a stent collar 11 and stent branches 12. The stent collar 11 is mounted on the exterior of the thrombectomy catheter 4. One end of the stent branches 12 is connected to the collar 11, and the other end is connected to the stent retaining ring 15. It will be understood that both the collar 11 and the stent retaining ring 15 are mounted on the thrombectomy catheter 4 to facilitate securing multiple stent branches 12 to the thrombectomy catheter 4. The synergistic action of the loading catheter 3, the thrombectomy catheter 4, and the thrombectomy stent 1 achieves efficient capture and removal of thrombi. The release and recovery functions of the thrombectomy stent 1 ensure the flexibility and safety of the operation, while the suction function further improves the thrombus removal effect. This design is suitable for a variety of intravascular thrombus removal operations.

[0047] According to one embodiment of the present invention, the stent collar 11 is fixedly mounted on the thrombectomy catheter 4, and the stent fixing ring 15 is slidably mounted on the thrombectomy catheter 4. In this way, the stent fixing ring 15 moves relative to the stent collar 11, thereby being able to adapt to changes in the maximum diameter of the fusiform three-dimensional frame formed by the plurality of stent branches 12. For example, the fusiform three-dimensional frame maintains its initial state when entering the blood vessel. When entering a narrower blood vessel, the fusiform three-dimensional frame is compressed by the blood vessel wall. At this time, the stent fixing ring 15 can slide away from the stent collar 11 on the thrombectomy catheter 4. In this way, the diameter adaptability of the fusiform three-dimensional frame becomes smaller, so that it can pass through the narrow blood vessel and quickly adapt to the shape of the blood vessel without excessively compressing the blood vessel wall. After passing through the narrow blood vessel, the stent branches 12 are adapted to elastically deform so that the fusiform three-dimensional frame returns to its initial state.

[0048] like Figure 8 As shown, in one embodiment, the connecting component 2 includes a thrombectomy tube seat 22 and a loading tube seat 21. Optionally, the thrombectomy tube seat 22 is made of materials such as PP / PC / PE. Specifically, the thrombectomy tube seat 22 is a three-way structure design, the straight cavity channel is a negative pressure channel, and the side cavity channel can be connected to other instruments according to intraoperative requirements, or can be tightened and sealed with a heparin cap. After the thrombectomy catheter 4 is inserted into the loading catheter 3, the thrombectomy catheter 4 is wrapped with a silicone sheet to achieve hemostasis and prevent leakage of the injected liquid. In addition, the loading tube seat 21 is a press-type design. By pressing the seal, the seal can push open the silicone gasket, making it smoother for the thrombectomy catheter 4 to be inserted into the loading catheter 3 without being disturbed by the friction of the silicone sheet.

[0049] Specifically, the loading pipe seat 21 is composed of a valve body, a silicone sheet, a gasket, a screw cap, and a head.

[0050] Specifically: the valve body of the loading tube seat 21 is a four-way design, the straight cavity channel is the insertion channel of the thrombectomy catheter 4, and the cavity channels on both sides are injection channels or suction channels. It can also be connected to other instruments according to actual usage, or sealed with a heparin cap.

[0051] Specifically, the screw cap is pressed against the compressed silicone sheet to achieve the functions of hemostasis and backflow prevention.

[0052] Specifically, the gasket is located between the silicone sheet and the screw cap, and the function of the gasket is to prevent the silicone sheet from being damaged during the process of tightening the screw cap.

[0053] According to one embodiment of the present invention, a thrombectomy device includes multiple thrombectomy stents 1, which are spaced apart and arranged on a thrombectomy catheter 4. It will be appreciated that after deployment, the multiple thrombectomy stents 1 can simultaneously support the vessel wall, providing good support and ensuring stability and effectiveness during the thrombectomy procedure.

[0054] like Figure 7As shown, according to one embodiment of the present invention, a suction port 41 is provided between each two adjacent thrombectomy stents 1. In the related art, single thrombectomy suction is typically performed by providing a port at the end of a suction tube to aspirate the thrombus. However, due to the lack of effective support for the blood vessel at the port of the suction tube, the port of the suction tube can easily be sucked onto the vessel wall, hindering the conduction of negative pressure while also causing damage to the vessel wall due to the high negative pressure. To address the above issues, the thrombectomy stent 1 of the present invention is provided on a suction catheter. When deployed, the thrombectomy stent 1 can provide support to the nearby blood vessels. Furthermore, the suction port 41 is located between the two thrombectomy stents 1. During the thrombus aspiration process, the support provided by the thrombectomy stent 1 prevents the suction port 41 from aspirating the vessel wall and causing damage.

[0055] Exemplarily, the thrombectomy catheter 4 comprises an inner tube, an intermediate braided layer, and an outer tube. Preferably, the inner tube is constructed of a low-friction material, such as PTFE / FEP or other fluoroplastics, to ensure a smooth aspiration path. Preferably, the intermediate braided layer is constructed of a metal material, such as stainless steel or nickel-titanium, to provide excellent support and pushability for the tube, while preventing collapse during aspiration. Preferably, the outer tube is constructed in multiple sections, with a transition from hard to soft at the proximal end to the distal end. This ensures pushability while maintaining a flexible tip to protect the vessel wall.

[0056] Specifically, the inner tube, middle braid, and outer tube are formed through thermoformation. Heat is applied to melt the outer tube and join it with the middle braid and inner tube. The inner tube and middle braid do not melt during the thermoformation process, ensuring low friction within the cavity.

[0057] Specifically, the distal end of the thrombectomy catheter 4 is provided with a plurality of suction holes, which are spaced apart along the axial direction of the thrombectomy catheter 4. Specifically, the thrombectomy stent 1 is sleeved on the distal end of the thrombectomy catheter 4, and does not cover the suction holes.

[0058] According to one embodiment of the present invention, the thrombus removal device includes a tip structure 5 , which is provided at the end of the thrombus removal catheter 4 away from the connecting component 2 .

[0059] Exemplarily, the tip structure 5 includes a soft rubber tip and a metal ferrule.

[0060] Preferably: the soft rubber tip is made of soft TPU material; Preferably: the soft rubber tip is a composite material of soft TPU material and developable material, which can be clearly developed under DSA; Optionally, the developable material is at least one of tungsten powder, barium sulfate powder, and bismuth dioxide.

[0061] Specifically: the inner cavity of the metal hoop cooperates with the thrombectomy catheter 4, and one end of the thrombectomy catheter 4 is inserted into the blind cavity of the metal hoop; Specifically: During the assembly process, a certain amount of glue must first be injected into the blind cavity of the metal hoop, and then the thrombectomy catheter 4 must be inserted into the blind cavity of the metal hoop. After the glue solidifies, the through hole at the head end of the thrombectomy catheter 4 can be sealed, so that the negative pressure is transmitted along the suction hole to ensure that there is no pressure leakage.

[0062] Specifically: the soft rubber head end and the metal hoop are insert-injection-molded.

[0063] Specifically, the connection between the soft rubber head and the metal hoop is an inverted buckle structure, which ensures the reliability of the connection and prevents the soft rubber head from falling off.

[0064] The thrombus removal device according to an embodiment of the present invention includes the above-mentioned thrombus removal bracket 1 and thus has all the technical effects of the above-mentioned thrombus removal bracket 1 , which will not be described in detail here.

[0065] According to the third embodiment of the present invention, the thrombus removal device includes a suction device and the above-mentioned thrombus removal device. The thrombus removal tube seat of the thrombus removal device is connected to the suction device. The suction device generates negative pressure, which is transmitted to the suction device along the suction hole, the inner cavity of the loading catheter, and the thrombus removal tube seat, so that the thrombus is sucked out of the body.

[0066] The thrombus removal device according to an embodiment of the present invention includes the above-mentioned thrombus removal device, and thus has all the technical effects of the above-mentioned thrombus removal device, which will not be described in detail here.

[0067] The following are the steps for thrombectomy: 1. First, according to the hospital's regulations, give the patient appropriate antianxiety drugs, analgesics, antibiotics and other premedication; 2. Patient anesthesia; 3. Use a syringe to draw physiological saline, connect the loading tube holder 21 and the thrombectomy tube holder 22, and flush the inner lumens of the thrombectomy catheter 4 and the loading catheter 3 respectively to empty the air inside the lumens; 4. Insert the cleaned thrombectomy catheter 4 into the lumen of the loading catheter 3, and place the thrombectomy stent 1 in a compressed and gripped position. Assemble and use. (At this point, only the tip 5 of the thrombectomy catheter 4 should extend from the lumen of the loading catheter 3.)

[0068] 4. After disinfecting the patient's puncture site, use a puncture needle (a conventional device in the hospital's interventional department) to perform puncture, and then insert the vascular sheath (a conventional device in the hospital's interventional department) into the patient's vascular cavity along the puncture point.

[0069] 5. Push the assembled thrombectomy catheter 4 and loading catheter 3 along the lumen of the vascular sheath to the lesion site in the blood vessel; 6. Confirm the device is in the correct position by direct observation under DSA imaging or by injecting contrast agent by connecting the loading tube holder 21 or the thrombectomy tube holder 22 (the thrombus to be treated should be located between the mesh plates along the vascular axis). Withdraw the loading catheter 3 until the thrombectomy stent 1 is fully deployed. 7. After the self-expanding thrombectomy stent 1 is fully deployed, use a negative pressure pump or syringe connected to the side branch of the thrombectomy catheter 4 to aspirate the thrombus. The vessel wall is now supported by the thrombectomy stent 1, and the aspiration hole will not be sucked onto the vessel wall. 8. After thrombus aspiration is completed, free thrombi, activated thrombi, and other thrombi that are difficult to aspirate will be collected by the thrombus removal stent 1 and prevented from being washed away by the blood flow, avoiding new risks.

[0070] 9. Withdraw the thrombus removal catheter 4. The thrombus captured or wrapped by the thrombus removal stent 4 is then retracted into the loading catheter 3 by the pull of the withdrawal force. Because the thrombus removal stent 1 has a relatively simple hollow structure and a flocking layer, it not only improves the ability to capture thrombi but also better protects the vessel wall and valves from damage.

[0071] 10. The thrombectomy catheter 4 and the complete set of instruments containing the loading catheter 3 are withdrawn from the body along the vascular sheath, and the vascular sheath is also withdrawn from the patient's body. The puncture site is sutured and bandaged to complete the thrombectomy operation.

[0072] Finally, it should be noted that the above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A thrombus removal stent, characterized in that: include: A bare stent, comprising a stent collar and a plurality of stent branches, one end of each of the stent branches being connected to the stent collar, each of the stent branches extending in an arc shape, and the plurality of stent branches forming a three-dimensional fusiform frame in the direction of their extension that is wide in the middle and narrow at both ends; A plurality of heat shrink tubes are provided, each of which is sleeved on one of the support rods, and the outer surface of each heat shrink tube is provided with a flocking layer.

2. The thrombus removal stent according to claim 1, characterized in that: A plurality of the support branches extend in a spiral manner.

3. The thrombus removal stent according to claim 1, characterized in that: The support branch includes a main body section and a connecting section connected to each other, one end of the main body section is connected to the support ring, the heat shrink tube is sleeved on the main body section, and the connecting section is provided at one end of the main body section away from the support ring.

4. A thrombus removal device, characterized in that: include: A connecting component, comprising a thrombus removal tube seat and a loading tube seat; a loading conduit connected to the loading tube seat; A thrombectomy catheter, which is passed through the loading catheter and is adapted to extend or retract from the loading catheter. The thrombectomy catheter is provided with a suction port and is connected to the thrombectomy tube base. The thrombectomy stent according to any one of claims 1 to 3, wherein the stent collar is sleeved on the thrombectomy catheter; A stent fixing ring, one end of the stent branch away from the stent collar is connected to the stent fixing ring, and the stent fixing ring is sleeved on the thrombectomy catheter.

5. The thrombus removal device according to claim 4, characterized in that: The bracket collar is fixedly sleeved on the thrombectomy catheter, and the bracket fixing ring is slidably sleeved on the thrombectomy catheter.

6. The thrombus removal device according to claim 4, characterized in that: The thrombus removal device includes a plurality of thrombus removal brackets, and the plurality of thrombus removal brackets are arranged at intervals on the thrombus removal catheter.

7. The thrombus removal device according to claim 6, characterized in that: A suction port is provided between every two adjacent thrombus removal brackets.

8. The thrombus removal device according to claim 4, characterized in that: The thrombus removal device includes a tip structure, and the tip structure is sleeved on the end of the thrombus removal catheter away from the connecting component.

9. A thrombus removal device, characterized in that: The invention comprises a suction device and the thrombus removal device according to any one of claims 4 to 8, wherein the thrombus removal tube seat of the thrombus removal device is connected to the suction device.

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