Thrombus aspiration catheter

Abstract

The application discloses a thrombus suction catheter, and relates to the technical field of thrombus treatment medical devices, which comprises a pipe body, a cutting mechanism and a filtering mechanism. The suction cavity and the filling cavity are parallelly extended along the length direction in the pipe body. The cutting mechanism is fixed in the suction cavity. The end of the cutting mechanism towards the distal end is provided with a cutting edge for cutting the thrombus. The filtering mechanism comprises a filling channel and a filtering membrane. The filling channel is provided with multiple channels at least in the circumferential direction. The proximal end of the filling channel is communicated with the filling cavity. The filtering membrane is connected between the adjacent filling channels. The application can avoid the problem that the traditional cutting device is exposed to the catheter and is easily damaged during the rotation cutting, and the filtering mechanism can capture the small thrombus particles after being filled, so as to avoid the small thrombus from flowing with the blood and causing the distal embolism.

Description

Technical Field

[0001] This invention relates to the field of thrombosis treatment medical device technology, and in particular to a thrombosis aspiration catheter. Background Technology

[0002] Currently, the mainstream thrombus aspiration devices in clinical practice are divided into three main categories, and each has certain problems when used.

[0003] 1. Simple straight-through negative pressure suction cannula Existing patents mostly employ a single-lumen direct-through aspiration structure, lacking a thrombus pretreatment and fragmentation structure. While this may be effective for fresh, soft thrombi, it easily causes blockage of the cannula and interruption of aspiration for old, fibrotic, or large, dense thrombi. Furthermore, the strong blood flow disturbance during aspiration makes it easy for small thrombi to drift with the blood flow, leading to distal embolism complications.

[0004] 2. Front-end rotary cutting-aspiration combined thrombus device Many publicly disclosed patents employ high-speed rotating blades, spiral cutting wires, and rotary grinding structures. These structures have three major drawbacks: first, the rigid, exposed cutting structure is prone to scraping and damaging the fragile vascular endothelium; second, the cutting process easily generates micron-sized ultrafine thrombus particles that cannot be intercepted or escaped.

[0005] 3. Balloon-type occlusion thrombus aspiration device Existing patented occlusion and aspiration techniques generally employ an inflatable balloon to completely block proximal blood flow, creating a static aspiration environment. However, this approach has significant drawbacks: complete blockage of blood flow can cause transient ischemic attacks in distal brain tissue and myocardium, increasing the risk of intraoperative ischemic injury.

[0006] The above background information is provided only to assist in understanding the concept and technical solution of this invention. It does not necessarily belong to the prior art of this application. In the absence of clear evidence that the above information was disclosed on the filing date of this application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0007] The purpose of this invention is to provide a thrombus aspiration catheter to solve the problems existing in the prior art. It can avoid the problem that traditional cutting devices are exposed outside the catheter and easily damage the thrombus during rotational cutting. Moreover, after the filter mechanism is filled, it can capture escaped small thrombus particles and prevent small thrombi from causing distal embolism as they flow with the blood.

[0008] To achieve the above objectives, the present invention provides the following solution: A thrombus aspiration catheter, comprising: The tube body has a suction chamber and a filling chamber extending in parallel along its length. The proximal end of the suction chamber is used to connect to a negative pressure suction device, and the proximal end of the filling chamber is used to connect to a medium filling device. A cutting mechanism is fixed inside the suction chamber, and a cutting blade for cutting thrombi is provided at the distal end of the cutting mechanism. The filter mechanism includes filling channels and filter membranes. The filling channels are arranged at least in multiple circumferential intervals. The proximal end of the filling channel communicates with the filling cavity, and the distal end of the filling channel is closed. The filter membranes are connected between adjacent filling channels. The filter membranes are provided with filter pores that allow blood to pass through and can filter blood clots. The filling channel is made of a flexible material. When not filled, the filling channel is in a contracted state. When filled, the filling channel is in an extended state and serves as the supporting framework of the filtration mechanism. In the extended state, the filtration mechanism has a tapered structure with a diameter that gradually increases from the proximal end to the distal end. The distal end of the filtration mechanism abuts against the inner wall of the blood vessel. The proximal end of the cavity enclosed by the filtration mechanism is connected to the suction cavity, and the distal end serves as the thrombus entry point.

[0009] As one implementation, multiple cutting mechanisms are spaced apart from far to near, and the diameter of the thrombus to be cut is progressively smaller for each of the multiple cutting mechanisms.

[0010] As one embodiment, the cutting mechanism has a tapered cavity with a diameter that gradually decreases from far to near, and the cutting edge of the cutting mechanism is located within the tapered cavity.

[0011] In one embodiment, the cutting mechanism includes a cylindrical housing and a cutter fixed inside the cylindrical housing, the distal end of the cutter having the cutting edge; at least a portion of the cavity in the cylindrical housing forms the conical cavity; the cutting edges are evenly spaced along the radial direction of the cylindrical housing.

[0012] As one embodiment, the filling channel includes a first channel and a second channel. Multiple first channels are arranged at intervals along the circumference of the tube body, and at least one of the first channels is connected at its proximal end to the distal end of the filling cavity. The second channel is a ring structure and is connected to the first channel. There may be one or more second channels. When there is one second channel, the second channel is connected to the far end of the first channel. When there are multiple second channels, the second channels are arranged at intervals from far to near and are all connected to the first channel.

[0013] As one embodiment, it also includes an energy storage mechanism located on the proximal side of the nearest cutting mechanism; The energy storage mechanism includes an elastic wall having a contracted state and an expanded state, and the energy storage cavity enclosed by the elastic wall is connected to the suction cavity; In its natural state, the elastic wall bulges outward along the radial direction of the suction chamber; when the suction pressure is within a set range, the elastic wall is absorbed and compressed; when the suction pressure is below the set range, the elastic wall is at least partially reset under the action of the elastic restoring force, and compensates for the suction pressure.

[0014] As one embodiment, it also includes a guide wire cavity arranged in parallel with the suction cavity, and a guide wire outlet is provided at the distal end of the guide wire cavity.

[0015] As one embodiment, from near to far, the tube body includes a proximal section, a middle section, and a distal section connected in sequence, wherein the hardness of the proximal section, the middle section, and the distal section gradually decreases, and the cutting mechanism is located in the distal section.

[0016] As one embodiment, it also includes a draining wire and a draining basket, wherein the draining wire is inserted into the suction chamber, and the middle part of the cutting mechanism has a central channel through which the draining wire passes. The drain basket includes multiple connecting wires evenly spaced along the circumference. The proximal end of each connecting wire is fixedly connected to the drain wire, and the distal end is fixedly connected to a sliding member. The sliding member is slidably disposed on the drain wire. The connecting wire is a shape memory alloy wire. In its natural state, the connecting wire is bent, causing the drain basket to expand. The maximum diameter of the drain basket after expansion is not less than the small diameter end diameter of the conical structure. Under radial external force, the connecting wire moves closer to the drain wire, causing the drain basket to contract.

[0017] In one embodiment, the sliding member is a slip ring sleeved on the unclogging wire; a unclogging handle is fixed to the proximal end of the unclogging wire.

[0018] Compared with the prior art, the present invention has the following technical effects: This invention, by placing the cutting mechanism within the suction chamber, utilizes negative pressure to draw out the thrombus, thus avoiding the problem of traditional cutting devices that are exposed outside the catheter and prone to damaging the thrombus during rotational cutting. Furthermore, in this invention, the filling channel in the filtration mechanism, once filled, acts as a supporting framework, allowing the filter membrane to fully expand. This not only enables the filter membrane to capture escaped fine thrombus particles, preventing them from causing distal embolism as they flow with the blood, but also ensures that while the filled channel provides a certain rigidity to support the expanded filter membrane, it remains a flexible structure, preventing damage to the blood vessel during insertion and after filling, thus guaranteeing the safety of the insertion and filtration processes.

[0019] The technical effects of other technical solutions of the present invention compared with the prior art are described in detail in specific embodiments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the thrombus aspiration catheter in the contracted state of the filtration mechanism according to one embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a portion of region A in the middle; Figure 3 This is a schematic diagram of the overall structure of the thrombus aspiration catheter in the deployed state of the filtration mechanism according to one embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a portion of region B in the middle; Figure 5 This is a schematic diagram of the radial cross-section of the tube in one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the filtration mechanism in one embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the primary cutting mechanism in one embodiment of the present invention; Figure 8 This is a schematic diagram of the radial cross-section of the primary cutting mechanism in one embodiment of the present invention; Figure 9 This is a radial cross-sectional schematic diagram of the secondary cutting mechanism in one embodiment of the present invention; Figure 10 This is a radial cross-sectional schematic diagram of a three-stage cutting mechanism in one embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of a thrombus aspiration catheter inserted into the thrombus site in one embodiment of the present invention (the filter mechanism and the drainage basket are both retracted). Figure 12 This is a schematic diagram of the structure of a thrombus aspiration catheter inserted into a thrombus site according to one embodiment of the present invention (the filter mechanism and the drainage basket are both unfolded). Figure 13 This is a schematic diagram of the unblocking mechanism (unblocking basket retraction) in one embodiment of the present invention. Figure 14 This is a schematic diagram of the unblocking mechanism (unblocking basket unfolded) in one embodiment of the present invention.

[0022] Figure label: 1. Tube body; 11. Suction chamber; 12. Filling chamber; 13. Guide wire chamber; 131. Guide wire outlet; 2. Primary cutting mechanism; 21. Cutting blade; 22. Central channel; 3. Secondary cutting mechanism; 4. Three-stage cutting mechanism; 5. Filtration mechanism; 51. Filling channel; 511. First channel; 512. Second channel; 52. Filter membrane; 6. Elastic wall; 7. Guidewire; 8. Connector; 81. Filling port; 82. Suction port; 83. Guide wire inlet; 9. Development ring; 10. Drain cleaner wire; 101. Drain cleaner basket; 1011. Connecting wire; 102. Slip ring; 103. Drain cleaner handle. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a thrombus aspiration catheter to solve the problems existing in the prior art. It can avoid the problem that traditional cutting devices are exposed outside the catheter and easily damage the thrombus during rotational cutting. Moreover, after the filter mechanism is filled, it can capture escaped small thrombus particles and prevent small thrombi from causing distal embolism as they flow with the blood.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1-14As shown, this embodiment provides a thrombus aspiration catheter, including a tube body 1, a cutting mechanism and a filtering mechanism 5. The tube body 1 has an aspiration chamber 11 and a filling chamber 12 extending in parallel along its length. The proximal end of the aspiration chamber 11 is used to connect to a negative pressure aspiration device, and the proximal end of the filling chamber 12 is used to connect to a medium filling device. The cutting mechanism is fixed inside the suction chamber 11, and a cutting blade 21 for cutting thrombi is provided at the distal end of the cutting mechanism. The filtering mechanism 5 includes a filling channel 51 and a filter membrane 52. The filling channel 51 is provided with multiple channels spaced apart at least circumferentially. The proximal end of the filling channel 51 is connected to the filling chamber 12, and the distal end of the filling channel 51 is closed. A filter membrane 52 is connected between adjacent filling channels 51. The filter membrane 52 is provided with filter holes that allow blood to pass through and can filter thrombi. The filling channel 51 is made of a flexible material. When the filling channel 51 is not filled, it is in a contracted state, and the corresponding filter membrane 52 is in a folded state. When the filling channel 51 is filled, it is in an extended state and serves as a supporting skeleton for the filtering mechanism 5 to support the unfolding of the filter membrane 52. In the extended state, the filtering mechanism 5 has a tapered structure with a diameter that gradually increases from the proximal to the distal end. The generatrix of this tapered structure can be a straight line or an arc. Furthermore, when the filling channel 51 is extended, the distal end of the filtering mechanism 5 abuts against the inner wall of the blood vessel, the proximal end of the cavity enclosed by the filtering mechanism 5 is connected to the suction chamber 11, and the distal end serves as the thrombus entry point.

[0027] In this embodiment, "proximal end" refers to the end closer to the surgeon, and "distal end" refers to the end farther from the surgeon, that is, the end closer to the patient.

[0028] In use, the tube 1 is pushed along the vascular access to the thrombus lesion site; a medium is injected into the filling channel 51 through the filling chamber 12. The medium is a liquid medium. After the medium is injected, the filling channel 51 and the filter membrane 52 gradually extend to form a thrombus particle interception barrier; the negative pressure suction device is activated, and negative pressure is formed in the suction chamber 11 to suction the thrombus. The thrombus enters the suction channel from the port of the filter mechanism 5. The cutting mechanism uses the cutting blade 21 to cut the thrombus into small thrombus particles with controllable particle size; the thrombus particles are continuously sucked into the suction chamber 11 and discharged. The small escaped particles are intercepted by the filter membrane 52, completely preventing distal embolism; after the thrombus suction is completed, the filling channel 51 is depressurized, the filling channel 51 and the filter membrane 52 contract, and the entire tube 1 is withdrawn to complete the operation.

[0029] Therefore, this embodiment, by placing the cutting mechanism inside the suction chamber 11, utilizes the suction force of negative pressure to cut the thrombus, avoiding the problem of traditional cutting devices being exposed outside the catheter and easily damaging the thrombus during rotational cutting. Furthermore, in this embodiment, the filling channel 51 in the filtration mechanism 5, after being filled, acts as a supporting frame, allowing the filter membrane 52 to fully unfold. This not only enables the filter membrane 52 to capture escaped small thrombus particles, preventing them from causing distal embolism as they flow with the blood, but also ensures that while the filling channel 51, after being filled, possesses a certain rigidity to support the unfolding of the filter membrane 52, it remains a flexible structure. This prevents damage to the blood vessel during insertion or after filling, ensuring the safety of the insertion and filtration processes.

[0030] After prolonged use, tiny blood clots may gradually clog the pores of the filter membrane 52, leading to a decrease in its filtration efficiency. To test the filtration efficiency of the filter membrane 52, a contrast agent can be injected into the blood vessel during surgery. The flow of the contrast agent with the blood can be observed through imaging, thus determining how well the blood passes through the filter membrane 52. If blood flow is found to be significantly slowed or even almost stopped, it indicates that the filter membrane 52 is severely clogged. In this case, the surgery is stopped, the catheter is removed and replaced with a new one for re-insertion.

[0031] In this embodiment, multiple cutting mechanisms are spaced apart, and the diameter of the thrombus to be cut by each cutting mechanism decreases progressively. "Progressively decreasing thrombus diameter" means that the distribution density of the cutting blades 21 in the cutting mechanism increases progressively from far to near, resulting in a progressively smaller particle size after thrombus cutting. By using multiple cutting mechanisms to cut the thrombus step by step, the cutting pressure of each cutting mechanism 2 can be reduced, making it easier to cut the thrombus and bring it to the desired particle size range.

[0032] In this embodiment, the cutting mechanism has a tapered cavity with a diameter that gradually decreases from distal to proximal, and the cutting blade 21 of the cutting mechanism is located within the tapered cavity. During negative pressure suction, the diameter of the tapered cavity gradually decreases along the suction direction (i.e., from distal to proximal), causing the blood carrying the thrombus to flow faster within the tapered cavity, resulting in greater contact force between the thrombus and the cutting blade 21, making it easier to cut the thrombus.

[0033] like Figure 7 As shown, in this embodiment, the cutting mechanism includes a cylindrical outer shell and a cutter fixed inside the cylindrical outer shell, the distal end of which has a cutting edge 21; at least a portion of the cavity in the cylindrical outer shell forms a conical cavity. Of course, in addition to the conical cavity, the cylindrical outer shell may also include a cylindrical cavity, which is located on the distal side of the conical cavity and is used to connect with the inner wall of the suction cavity 11.

[0034] In this embodiment, the cutters are evenly spaced along the radial direction of the cylindrical outer shell.

[0035] like Figures 8-10 As shown, in this embodiment, the aspiration chamber 11 has three cutting mechanisms, referred to as primary cutting mechanism 2, secondary cutting mechanism 3, and tertiary cutting mechanism 4 from far to near. Primary cutting mechanism 2 has four cutting blades 21 evenly distributed circumferentially, secondary cutting mechanism 3 has eight cutting blades 21 evenly distributed circumferentially, and tertiary cutting mechanism 4 has twelve cutting blades 21 evenly distributed circumferentially. By adjusting the angle between adjacent cutting blades 21, the cutting particle size of the thrombus particles can be adjusted. Through the multi-stage cutting mechanism in this embodiment, the thrombus can be uniformly sheared into small thrombus particles with a particle size of 200μm-500μm.

[0036] In this embodiment, both the cutting blade and the cylindrical outer shell are made of nickel-titanium alloy, which has a certain radial deformation capability under the action of external radial force. When passing through the hard blood vessel wall, it can radially contract to avoid it, exerting shearing and squeezing effects only on soft thrombi, and causing virtually no damage to the blood vessel wall.

[0037] In this embodiment, the filling channel 51 includes a first channel 511 and a second channel 512. Multiple first channels 511 are spaced apart circumferentially along the tube body 1, with at least one first channel 511 having its proximal end connected to the distal end of the filling cavity 12. The second channel 512 has an annular structure and is connected to the first channel 511. One or more second channels 512 are provided. When only one second channel 512 is provided, it is connected to the distal end of the first channel 511. When multiple second channels 512 are provided, they are spaced apart from distal to proximal and are all connected to the first channel 511. When the filling channel 51 is filled, after injecting medium into at least one first channel 511, the medium gradually fills all the filling channels 51, enabling the expansion of the filling channel 51 and the filter membrane 52.

[0038] In this embodiment, the suction chamber 11 is located in the middle of the tube body 1 and has a large cross-sectional area, while the filling chamber 12 is located on one side of the suction chamber 11.

[0039] In this embodiment, the filling channel 51 expands and unfolds after being filled with liquid medium, forming a cone-shaped structure with its large diameter section adhering to the inner wall of the blood vessel, thereby filtering thrombus particles. The filling channel 51 contracts after drawing out the liquid medium under negative pressure (this negative pressure is only used to extract the liquid medium, and is a different suction system than the negative pressure used for thrombus particles). The maximum size of the expanded filling channel 51 can be designed in different models to fit different blood vessel diameters.

[0040] If the middle part of the filling channel 51 dries out and closes under negative pressure during the extraction process, making it difficult to completely extract the medium at the far end, a certain amount of liquid medium can be refilled to expand the closed part. Then, the suction pressure can be reduced, and the liquid medium can be slowly extracted to ensure that the liquid medium is completely discharged. This will prevent a sharp drop in local pressure in the filling channel 51 from causing partial closure and making it difficult to extract the liquid medium at the far end.

[0041] This embodiment also includes an energy storage mechanism, which includes an elastic wall 6 having a contracted state and an expanded state. The energy storage cavity enclosed by the elastic wall 6 is connected to the suction cavity 11. In its natural state, the elastic wall 6 bulges outward along the radial direction of the suction cavity 11 and can be hemispherical. When the suction pressure is within a set range, the elastic wall 6 is absorbed and contracted under the action of negative pressure, and the volume of the energy storage cavity enclosed by the elastic wall 6 decreases. When the suction pressure is lower than the set range, for example, the elastic wall 6 is at least partially reset under the action of elastic restoring force, and the volume of the energy storage cavity increases. During the process of increasing the volume of the energy storage cavity, a certain suction effect will also be generated on the distal end of the suction cavity 11, thereby compensating for the suction pressure and reducing the impact of suction pressure fluctuations on suction.

[0042] In this embodiment, the energy storage mechanism is located on the proximal side of the nearest cutting mechanism.

[0043] This embodiment also includes a guide wire cavity 13 arranged parallel to the suction cavity 11, and a guide wire outlet 131 is provided at the distal end of the guide wire cavity 13. The guide wire cavity 13 is used to insert a guide wire 7 to guide the insertion process of the tube body 1.

[0044] In this embodiment, from proximal to distal, the tube 1 includes a proximal segment, a middle segment, and a distal segment connected sequentially. The rigidity of the proximal segment, the middle segment, and the distal segment gradually decreases, and the cutting mechanism is located in the distal segment. The proximal segment has higher rigidity, which can provide rigid support and prevent the tube 1 from bending during the pushing process; the middle segment has moderate rigidity and anti-torsion properties, which can prevent the tube 1 from rotating and twisting during the operation; the distal segment has lower rigidity, which can adapt to tortuous blood vessels and branch blood vessels, can conform to the blood vessel wall without rigid support, and improve the passage of the tube 1 in the blood vessel.

[0045] Specifically, in this embodiment, the hardness of at least one of the proximal, middle, and distal segments can be a fixed value, that is, the hardness of a certain segment is a constant value. The length of the proximal segment accounts for 60%-72% of the total length of the pipe body 1, the length of the middle segment accounts for 15%-25% of the total length of the pipe body 1, and the length of the distal segment accounts for 8%-15% of the total length of the pipe body 1. Alternatively, the hardness of at least one segment can also conform to the variation law of gradually decreasing hardness from near to far, so that the overall hardness distribution of the pipe body 1 gradually decreases from near to far.

[0046] The hardness of the connection points between adjacent segments can be the same or different.

[0047] In this embodiment, the hardness of the proximal segment is Shore 65–80D, the hardness of the middle segment is Shore 50–65D, and the hardness of the distal segment is Shore 35–50D.

[0048] In this embodiment, the middle section has a built-in PET braided reinforcement layer, which has the function of resisting negative pressure collapse and ensuring that the cavity does not deform during high negative pressure suction.

[0049] In this embodiment, a developing ring 9 is also provided on the distal side wall of the tube body 1 and / or the proximal side wall of the energy storage mechanism to facilitate the staff to observe the position of the tube body 1.

[0050] This embodiment also includes a connector 8 connected to the proximal end of the tube body 1. The connector 8 is provided with a filling port 81, a suction port 82, a guide wire inlet 83, and channels corresponding to the three ports. Among them, the filling port 81 is connected to the filling cavity 12 through the first channel; the suction port 82 is connected to the suction cavity 11 through the second channel; and the guide wire inlet 83 is connected to the guide wire cavity 13 through the third channel.

[0051] like Figures 11-14 As shown, this embodiment also includes a drain cleaning wire 10 and a drain cleaning basket 101. The drain cleaning wire 10 is inserted into the suction chamber 11, and the middle part of the cutting mechanism has a central channel 22 through which the drain cleaning wire 10 passes. The drain cleaning basket 101 includes multiple connecting wires 1011 evenly spaced along the circumference. The proximal end of the connecting wire 1011 is fixedly connected to the drain cleaning wire 10, and the distal end is fixedly connected to a sliding member. The sliding member is slidably disposed on the drain cleaning wire 10. The connecting wire 1011 is a shape memory alloy wire. In its natural state, the connecting wire 1011 is bent, causing the drain cleaning basket 101 to expand. The maximum diameter of the drain cleaning basket 101 after expansion is not less than the small diameter end diameter of the conical structure. Under radial external force, the connecting wire 1011 approaches the drain cleaning wire 10, causing the drain cleaning basket 101 to contract.

[0052] In this embodiment, the unblocking wire 10 is integrated within the suction chamber 11, eliminating the need for temporary assembly by personnel. Under the constraint of the suction chamber 11 wall, the connecting wire 1011 has a gently curved shape and is positioned close to the unblocking wire 10, while the unblocking basket 101 is in a contracted state. When a large thrombus blocks the conical structure (i.e., the filter mechanism) and cannot be suctioned into the suction chamber 11 by negative pressure, the unblocking wire 10 is pushed distally, exposing the unblocking basket 101 at the distal end of the suction chamber 11. After losing external force constraint, the unblocking basket 101 gradually expands, forming a spherical basket structure to unblock the thrombus blocking the filter mechanism. Simultaneously, the thin connecting wire 1011 of the unblocking basket 101 also has a certain cutting effect on the thrombus, reducing the diameter of the thrombus particles and facilitating suction.

[0053] Furthermore, when the filling channel 51 needs to be aspirated after the operation, causing the filling channel 51 to become partially dry, closed, and curled, and there is still filling medium at the distal end of the closed position, the unclogging basket 101 can be used to manipulate the filter mechanism 5 that has not fully shrunk, so that the closed and curled position is straight and open, making it easier to continue aspirating the filling channel 51.

[0054] In this embodiment, the distal end of the unblocking wire 10 is hemispherical or has an arc-shaped transition structure at the connection between the side wall and the end face, and the distal end of the unblocking wire 10 is made of a soft material, such as silicone, to reduce the possibility of damage to the inner wall of the blood vessel during the unblocking wire 10 push-out process.

[0055] In this embodiment, the sliding member is a slip ring 102 sleeved on the unclogging wire 10; after the connecting wire 1011 loses the external force, it automatically contracts and drives the slip ring 102 to slide towards the proximal end, forming an expanded unclogging basket 101.

[0056] The drain cleaner 10 has a drain handle 103 fixed to its proximal end. The operator can push or retract the drain cleaner 10 by manipulating the drain handle 103.

[0057] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0058] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A thrombus aspiration catheter, characterized in that, include: The tube body has a suction chamber and a filling chamber extending in parallel along its length. The proximal end of the suction chamber is used to connect to a negative pressure suction device, and the proximal end of the filling chamber is used to connect to a medium filling device. A cutting mechanism is fixed inside the suction chamber, and a cutting blade for cutting thrombi is provided at the distal end of the cutting mechanism. The filter mechanism includes filling channels and filter membranes. The filling channels are arranged at least in multiple circumferential intervals. The proximal end of the filling channel communicates with the filling cavity, and the distal end of the filling channel is closed. The filter membranes are connected between adjacent filling channels. The filter membranes are provided with filter pores that allow blood to pass through and can filter blood clots. The filling channel is made of a flexible material. When not filled, the filling channel is in a contracted state. When filled, the filling channel is in an extended state and serves as the supporting framework of the filtration mechanism. In the extended state, the filtration mechanism has a tapered structure with a diameter that gradually increases from the proximal end to the distal end. The distal end of the filtration mechanism abuts against the inner wall of the blood vessel. The proximal end of the cavity enclosed by the filtration mechanism is connected to the suction cavity, and the distal end serves as the thrombus entry point.

2. The thrombus aspiration catheter according to claim 1, characterized in that, From far to near, multiple cutting mechanisms are spaced apart, and the diameter of the thrombus to be cut is progressively smaller for each of the multiple cutting mechanisms.

3. The thrombus aspiration catheter according to claim 1, characterized in that, The cutting mechanism has a tapered cavity with a diameter that gradually decreases from far to near, and the cutting edge of the cutting mechanism is located within the tapered cavity.

4. The thrombus aspiration catheter according to claim 3, characterized in that, The cutting mechanism includes a cylindrical housing and a cutter fixed inside the cylindrical housing, the distal end of the cutter having the cutting edge; at least a portion of the cavity in the cylindrical housing forms the tapered cavity; The cutting blades are evenly spaced along the radial direction of the cylindrical outer shell.

5. The thrombus aspiration catheter according to claim 1, characterized in that, The filling channel includes a first channel and a second channel. Multiple first channels are arranged at intervals along the circumference of the tube body, and at least one of the first channels is connected at its proximal end to the distal end of the filling cavity. The second channel is a ring structure and is connected to the first channel. There may be one or more second channels. When there is one second channel, the second channel is connected to the far end of the first channel. When there are multiple second channels, the second channels are arranged at intervals from far to near and are all connected to the first channel.

6. The thrombus aspiration catheter according to claim 1, characterized in that, It also includes an energy storage mechanism located on the proximal side of the nearest cutting mechanism; The energy storage mechanism includes an elastic wall having a contracted state and an expanded state, and the energy storage cavity enclosed by the elastic wall is connected to the suction cavity; In its natural state, the elastic wall bulges outward along the radial direction of the suction cavity; When the suction pressure is within the set range, the elastic wall is absorbed and compressed; when the suction pressure is lower than the set range, the elastic wall is at least partially reset under the action of the elastic restoring force, and compensates for the suction pressure.

7. The thrombus aspiration catheter according to claim 1, characterized in that, It also includes a guide wire cavity arranged in parallel with the suction cavity, and a guide wire outlet is provided at the distal end of the guide wire cavity.

8. The thrombus aspiration catheter according to claim 1, characterized in that, From near to far, the tube body includes a proximal section, a middle section, and a distal section connected in sequence, with the hardness of the proximal section, the middle section, and the distal section gradually decreasing, and the cutting mechanism located in the distal section.

9. The thrombus aspiration catheter according to claim 1, characterized in that, It also includes a drain cleaner and a drain basket, wherein the drain cleaner is inserted into the suction chamber and the middle part of the cutting mechanism has a central channel through which the drain cleaner passes. The drain basket includes multiple connecting wires evenly spaced along the circumference. The proximal end of each connecting wire is fixedly connected to the drain wire, and the distal end is fixedly connected to a sliding member. The sliding member is slidably disposed on the drain wire. The connecting wire is a shape memory alloy wire. In its natural state, the connecting wire is bent, causing the drain basket to expand. The maximum diameter of the drain basket after expansion is not less than the small diameter end diameter of the conical structure. Under radial external force, the connecting wire moves closer to the drain wire, causing the drain basket to contract.

10. The thrombus aspiration catheter according to claim 9, characterized in that, The sliding element is a slip ring sleeved on the unclogging wire; a unclogging handle is fixed to the proximal end of the unclogging wire.

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