Thrombectomy device

Abstract

The application relates to a thrombus extraction device, comprising: a suction tube for sucking thrombus; the plugging balloon is arranged outside the suction tube; the extension pipe is connected into the suction pipe in a sliding mode, and the moving direction of the extension pipe is the same as the length direction of the suction pipe; the dragging balloon is arranged outside the extension tube, the dragging balloon is arranged in the length direction of the extension tube, the dragging balloon comprises a collecting section, the side, facing the suction tube, of the collecting section is provided with a stress face used for abutting against thrombus, and when the dragging balloon expands, the collecting section is attached to a target blood vessel, and when the dragging balloon expands, the collecting section abuts against the thrombus; the blocking balloon expands and is attached to the blood vessel wall in a self-adaptive mode, blood flowing from the near end to the far end is temporarily and completely blocked, a static operation environment free of blood flow flushing is created for subsequent steps, then the dragging balloon expands, the diameter of the collecting section of the dragging balloon is matched with or slightly smaller than that of a target blood vessel, and therefore the blood vessel blocking effect is achieved. And the stress surface of the collection section clings to the thrombus and carries out negative pressure suction towards one side of the far end.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and in particular to a thrombectomy device. Background Technology

[0002] Thrombosis is the process by which an abnormal solid mass forms within a blood vessel (usually a heart chamber or vessel wall) while the blood is flowing. The direct damage caused by thrombosis stems from the blockage of the blood vessel and the resulting ischemia and hypoxia in downstream tissues. Interventional therapy has become the mainstream treatment for thrombosis, mainly involving balloon and sheath. The balloon is used to fix the thrombus and facilitate its movement, while the sheath is used to aspirate the thrombus. The balloon typically uses a dragging motion to pull the thrombus back into the sheath, and then negative pressure suction is used to remove the thrombus from the sheath to the outside of the body.

[0003] In clinical practice, conventional balloon thrombectomy techniques have significant limitations, especially when dealing with organized, tightly adhered old thrombi or lesions complicated by atherosclerotic stenosis. The physical dragging method is difficult to completely remove the thrombus, and it is easy to cause the thrombus to fragment, the plaque to detach, and the formation of new emboli. At the same time, during the operation of pulling the thrombus back into the sheath, the friction between the thrombus and the blood vessel wall also poses a high risk of detachment. Once detached, it can easily cause fatal embolisms in distant critical organs (such as the brain and lungs). These inherent defects not only reduce the vascular recanalization rate, but also make the surgical outcome highly dependent on the surgeon's experience and constrained by complex anatomical conditions such as vascular tortuosity and calcification. Summary of the Invention

[0004] This application provides a thrombectomy device to solve the problem of thrombus detachment during interventional treatment in related technologies.

[0005] In a first aspect, a thrombectomy device is provided, comprising:

[0006] A suction tube, used to aspirate blood clots;

[0007] An occlusion balloon is disposed outside a suction tube, and an expansion cavity for controlling the expansion of the occlusion balloon is formed inside the suction tube.

[0008] An extension tube is slidably connected inside the suction tube, and the direction of movement of the extension tube is the same as the length direction of the suction tube.

[0009] The drag balloon is placed outside the extension tube and can be inflated. The drag balloon is set along the length of the extension tube and includes a collection section. The collection section has a force-bearing surface on the side facing the aspiration tube for abutting the thrombus. When the drag balloon inflates, the collection section fits against the target blood vessel.

[0010] In some embodiments, the drag balloon also includes a positioning segment connected to the force-bearing surface of the collection segment, and the area of ​​the positioning segment connected to the collection segment is smaller than the area of ​​the force-bearing surface. When the drag balloon inflates, the positioning segment squeezes the thrombus towards the thrombus side.

[0011] In some embodiments, the positioning segment is provided with a thrombus fixation member, and the thrombus fixation member is sleeved outside the positioning segment. When the side of the positioning segment compresses the thrombus, the thrombus fixation member expands along with the positioning segment and penetrates the thrombus.

[0012] In some embodiments, the force-bearing surface forms a right angle with the side of the collection section facing the thrombus.

[0013] In some embodiments, a puncture element and a Luer seat are respectively installed at opposite ends of the extension tube, and the puncture element and the Luer seat are respectively located on both sides of the suction tube, with a first stress-relieving tube provided between the Luer seat and the extension tube.

[0014] In some embodiments, the Luer seat includes a first tube body;

[0015] The first tube body is provided with a guide wire cavity and a first filling cavity. The length direction of the guide wire cavity extends along the length direction of the suction tube, and the first filling cavity is located on the side of the guide wire cavity.

[0016] In some embodiments, suction heads and catheter seats are respectively provided at opposite ends of the suction tube, with the suction heads located on the side of the suction tube facing the drag balloon.

[0017] In some embodiments, the opening size of the suction head near the drag balloon is larger than the opening size of the suction head near the suction tube.

[0018] In some embodiments, a side suction hole is provided on the side of the suction tube connected to the suction head, and the side suction hole is located between the occlusion balloon and the suction head.

[0019] In some embodiments, a second stress-relieving tube is provided between the catheter seat and the suction tube. The catheter seat includes a second tube body, and the second tube body is provided with a delivery chamber, a second filling chamber, and a suction chamber. The delivery chamber extends along the length direction of the suction tube and is connected to the suction tube. The second filling chamber and the suction chamber are located on both sides of the delivery chamber, and the suction chamber is connected to the delivery chamber.

[0020] This application provides a thrombectomy device. By expanding a blocking balloon and adaptively attaching it to the blood vessel wall, this application achieves temporary and complete blockage of blood flow from the proximal end to the distal end, creating a static, blood-free operating environment for subsequent steps. This prevents the thrombus from being dispersed or detached by the blood flow during subsequent operations, and avoids the risk of distal (such as intracranial or pulmonary artery) embolism. This provides fundamental safety assurance for the entire thrombectomy operation. Afterward, the balloon is dragged to expand. The diameter of the collection section of the dragging balloon matches or is slightly smaller than that of the target blood vessel, and the force-bearing surface of the collection section is in close contact with the distal side of the thrombus for negative pressure suction.

[0021] The suction tube is designed with side suction holes. During negative pressure suction, the side suction holes and the suction head form a three-dimensional suction network, which can actively and promptly remove any thrombus fragments that may detach, avoiding the possibility of small thrombi escaping. At the same time, it also avoids the risk of small thrombi escaping after the thrombus treatment device is withdrawn from the blood vessel. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure provided for an embodiment of this application;

[0024] Figure 2 A schematic diagram of the structure of the Luer seat is provided for the embodiments of this application;

[0025] Figure 3 A schematic diagram of the catheter hub is provided for the embodiments of this application;

[0026] Figure 4 A schematic diagram of the puncture device is provided for the embodiments of this application;

[0027] Figure 5 A schematic diagram of the structure of the drag balloon is provided for an embodiment of this application;

[0028] Figure 6 A schematic diagram of the thrombus fixation component is provided for the embodiments of this application;

[0029] Figure 7 A schematic diagram of the suction head structure is provided for an embodiment of this application;

[0030] Figure 8 A schematic diagram of the occlusion balloon is provided for the embodiments of this application;

[0031] Figure 9 for Figure 7 Cross-sectional view of the structure at point AA.

[0032] In the diagram: 1. Aspiration tube; 2. Occlusion balloon; 3. Inflation chamber; 4. Extension tube; 5. Dragging balloon; 51. Collection section; 52. Positioning section; 53. Force-bearing surface; 6. Thrombus fixation element; 7. Puncture element; 8. Luer seat; 81. First tube body; 82. Guidewire lumen; 83. First filling chamber; 9. First stress-relieving tube; 10. Aspiration head; 11. Catheter seat; 111. Second tube body; 112. Delivery chamber; 113. Second filling chamber; 114. Aspiration chamber; 12. Second stress-relieving tube; 13. Side aspiration port; 14. Outer layer; 15. Second intermediate layer; 16. First intermediate layer; 17. Inner layer. Detailed Implementation

[0033] The technical solutions in 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 protection scope of the present invention.

[0034] This application provides a thrombectomy device that can solve the problem of thrombus detachment during interventional treatment in related technologies.

[0035] Please see Figures 1 to 7 A thrombectomy device includes: an aspiration tube 1, an occlusion balloon 2, an extension tube 4, and a drag balloon 5. It is used to aspirate thrombi. The occlusion balloon 2 is disposed outside the aspiration tube 1, and an expansion chamber 3 is formed inside the aspiration tube 1 to control the expansion of the occlusion balloon 2. The extension tube 4 is slidably connected inside the aspiration tube 1, and the movement direction of the extension tube 4 is the same as the length direction of the aspiration tube 1. The drag balloon 5 is disposed outside the extension tube 4, and the extension tube 4 and the drag balloon 5 are connected by welding to fix the position of the drag balloon 5 on the extension tube 4. The drag balloon 5 is inflatable and is arranged along the length direction of the extension tube 4. The drag balloon 5 includes a collection section 51, and the collection section 51 has a force-bearing surface 53 facing the aspiration tube 1 for abutting the thrombus. When the drag balloon 5 expands, the collection section 51 adheres to the target blood vessel.

[0036] It should be noted that in the field of interventional medical devices, the end of the medical device closer to the clinician inside the body is generally called the proximal end, and the end farther from the clinician is called the distal end. This principle is used to define the proximal and distal ends of any part of the interventional device. The axial direction generally refers to the length of the medical device, and the radial direction generally refers to the direction perpendicular to the axial direction. This principle is used to define the axial and radial directions of the interventional device.

[0037] During interventional treatment, one end of the extension tube 4 passes through the thrombus from proximal to distal, ensuring that the collection segment 51 of the drag balloon 5 also passes through the thrombus and is located on one side of it. Simultaneously, the aspiration tube 1 is located on the other side of the thrombus. The aspiration tube 1 and the collection segment 51 are positioned on opposite sides of the thrombus, with the aspiration tube 1 located proximal to the thrombus and the collection segment 51 located distal to it. Before thrombectomy, the occlusion balloon 2 is inflated through the expansion chamber 3, causing it to expand and adaptively adhere to the vessel wall. This temporarily and completely blocks the flow of blood from proximal to distal, creating a static, blood-free operating environment for subsequent steps. This prevents the thrombus from being dispersed or detached by the blood flow during subsequent procedures, thus avoiding the risk of distal (e.g., intracranial or pulmonary) embolism and providing a fundamental basis for the entire thrombectomy operation. For safety assurance, the balloon 5 is then inflated by dragging it. After inflation, the diameter of the collection section 51 of the balloon 5 matches or is slightly smaller than that of the target blood vessel, and the force-bearing surface 53 of the collection section 51 is close to the distal side of the thrombus. When the staff pulls the extension tube 4, the thrombus abuts against the force-bearing surface 53 and moves along the blood vessel towards the suction tube 1. Because the collection section 51 matches the blood vessel, it will completely peel off the thrombus on the blood vessel wall. At the same time, if the thrombus breaks apart or the plaque falls off, producing a new embolus, the collection section 51 will also drag the thrombus along with the new embolus to the suction tube 1 for negative pressure suction. This application completely collects the thrombus in the blood vessel and the thrombus on the blood vessel wall through the collection section 51 and the force-bearing surface 53 of the collection section 51. In addition, the blocking balloon 2 will create a safe environment for dragging the balloon 5 to drag the thrombus, avoiding the safety hazards caused by blood flow.

[0038] The drag balloon 5 is a semi-compliant balloon made of Pebax (polyether block polyamide), nylon, or polyethylene. The occlusion balloon 2 is a compliant balloon made of TPU or silicone. After inflation, it takes on a spherical or near-spherical shape. Its spherical design allows for better adaptation to irregular vessel walls, achieving instantaneous complete occlusion and blocking blood flow and small thrombi. Those skilled in the art should understand that a compliant balloon, once the pressure increases to a specified value or expands to a predetermined size, continues to increase in size with increasing inflation pressure. In contrast, a semi-compliant balloon, once the pressure increases to a specified value or expands to a predetermined size, increases in size within a smaller range with increasing inflation pressure.

[0039] The suction tube 1 is divided into an outer layer 14, a second intermediate layer 15, a first intermediate layer 16, and an inner layer 17. The inner layer 17 is made of a polymer material with a very low coefficient of friction, such as PTFE or HDPE. The first intermediate layer 16 is a woven mesh composed of flat or round metal wires, preferably stainless steel, nickel-titanium alloy, or cobalt-chromium alloy. The second intermediate layer 15 is made of Pebax, PU, ​​etc. The outer layer 14 is made of TPU, Peabx, or silicone. The expansion chamber 3 is located in the outer layer 14 and the second intermediate layer 15. The sealing balloon 2 can be inflated by connecting a pressurizing device. The innermost part of the multi-layer tube body is provided with a cavity that communicates with the delivery chamber 112 and the suction chamber 114.

[0040] It should be noted that the extension tube 4 has an expansion chamber 3 that is the same as that in the suction tube 1. The expansion chamber 3 in the extension tube 4 is connected to the drag balloon 5. The drag balloon 5 can be inflated by connecting a pressurizing device to the opening on one side of the first inflation chamber 83.

[0041] Specifically, in this embodiment, the drag balloon 5 also includes a positioning segment 52, which is connected to the force-bearing surface 53 of the collection segment 51. The area of ​​the positioning segment 52 connected to the side of the collection segment 51 is smaller than the area of ​​the force-bearing surface 53. When the drag balloon 5 expands, the side of the positioning segment 52 squeezes the thrombus.

[0042] Both the collection section 51 and the positioning section 52 are cylindrical after expansion. When the collection section 51 is attached to the side of the thrombus, the positioning section 52 is located inside the thrombus. After the drag balloon 5 expands, the collection section 51 and the positioning section 52 expand simultaneously. The diameter of the positioning section 52 after expansion is smaller than that of the collection section 51. The positioning section 52 fixes the thrombus by squeezing. The positioning section 52 can generate a dragging force on the thrombus from inside the thrombus through friction, which assists the force-bearing surface 53 of the collection section 51 in pushing the dragging force on the thrombus, making it easier for staff to drag the thrombus.

[0043] More specifically, in this embodiment, the positioning segment 52 is provided with a thrombus fixation member 6, and the thrombus fixation member 6 is sleeved outside the positioning segment 52. When the side of the positioning segment 52 squeezes the thrombus, the thrombus fixation member 6 expands along with the positioning segment 52 and the thrombus fixation member 6 pierces into the thrombus.

[0044] The thrombus fixation component 6 is a cylindrical mesh made of multiple fine metal wires of shape memory alloy (such as nitinol) arranged in a predetermined spiral, axial or mesh array. The thrombus fixation component 6 is connected to the pins of the positioning section 52 by welding. The distal end of the thrombus fixation component 6 can be fixed to the surface of the positioning section 52 by glue or placed by direct sleeve. When the balloon is inflated, the thrombus fixation component 6 can actively penetrate and mechanically lock the proximal end of the thrombus, providing an anchoring force far superior to the surface friction of ordinary balloons, ensuring a firm grip on old or difficult-to-hold thrombi.

[0045] Preferably, in this embodiment, the force-bearing surface 53 and the collecting section 51 are perpendicular to the side facing the thrombus, so that the force-bearing surface 53 remains vertical relative to the thrombus. When the force-bearing surface 53 abuts against the thrombus, the thrust on the thrombus is more concentrated. At the same time, it can avoid the problem that the thrust caused by the tilt of the force-bearing surface 53 will cause the thrombus to break apart, making it difficult to collect the thrombus.

[0046] Specifically, in this embodiment, a puncture member 7 and a Luer seat 8 are respectively installed at opposite ends of the extension tube 4, and the puncture member 7 and the Luer seat 8 are respectively located on both sides of the suction tube 1. The puncture member 7 and the extension tube 4 are an integral structure, and a first stress relief tube 9 is provided between the Luer seat 8 and the extension tube 4.

[0047] The extension tube 4 and the Luer seat 8 are bonded together with UV adhesive or integrally molded by injection molding. The first stress relief tube 9 is fixed on the Luer seat 8 and sleeved on the extension tube 4, forming a flexible stress transition zone between the Luer seat 8 and the extension tube 4. When the end of the extension tube 4 away from the Luer seat 8 is repeatedly bent, the alternating stress borne by the end close to the Luer seat 8 will be absorbed and dispersed by the first stress relief tube 9, avoiding stress concentration at the rigid connection point between the extension tube 4 and the Luer seat 8. This can effectively prevent the connection point of the extension tube 4 from breaking due to fatigue, and greatly extend the service life and reliability of the product.

[0048] The puncture element 7 is a hollow frustum shape, which can prevent damage to blood vessels during catheter advancement and retraction, and also improve catheter permeability. The puncture element 7 is hardened, which can effectively prevent the extension tube 4 from bending, deforming or bulging like a "mushroom head" when passing through hard and old thrombi under the guidance of the guidewire. This allows it to penetrate the center of the thrombus or pass along its edge with less thrust, ensuring that the drag balloon 5 can reach the predetermined position at the distal end of the thrombus smoothly. The tip material can be designed with high-hardness polymer materials (such as Pebax 7233, Pebax 7433, Nylon 12, Nylon 11), or a polymer or metal braided reinforcement layer can be built into the tip tube. The design of the puncture element 7 ensures that subsequent interventional treatments can be performed smoothly and improves the success rate of instrument access and treatment of complex lesions.

[0049] More specifically, in this embodiment, the Luer seat 8 includes a first tube body 81, and a guide wire cavity 82 and a first filling cavity 83 are provided in the first tube body 81. The length direction of the guide wire cavity 82 extends along the length direction of the suction tube 1, and the first filling cavity 83 is located on the side of the guide wire cavity 82.

[0050] The first tube body 81 adopts an over-the-wire (OTW) integral structure, and the guidewire lumen 82 runs through the entire first tube body 81, providing excellent guidewire tracking and the ability to pass through complex and tortuous blood vessels. A pressurizing device can be connected to the first filling lumen 83, and the drag balloon 5 can be inflated by the pressurizing device.

[0051] In a preferred embodiment, suction heads 10 and guide tube seats 11 are respectively provided at opposite ends of the suction tube 1. The suction tube 1 and the guide tube seat 11 are integrally formed by UV glue bonding or encapsulation injection molding. The suction head 10 is located on the side of the suction tube 1 facing the dragging balloon 5. The opening size of the suction head 10 on the side closer to the dragging balloon 5 is larger than the opening size of the suction head 10 on the side closer to the suction tube 1.

[0052] like Figure 7 and 8 As shown, the suction head 10 has an enlarged design on the side that aspirates thrombi. It can be designed as a funnel or flared mouth shape, which can greatly improve the capture efficiency and capacity for large thrombi pulled back to the tube opening. When the thrombus is dragged to the opening of the suction head 10, it can greatly reduce the difficulty of the thrombus entering the inner lumen of the suction head 10, allowing the thrombus to enter the suction head 10 more smoothly and completely. This directly solves the problem of thrombi getting stuck at the tip or requiring repeated suction, thereby significantly improving suction efficiency and shortening the operation time.

[0053] like Figure 7 and 8 As shown, in this embodiment, a side suction hole 13 is provided on the side of the suction tube 1 connected to the suction head 10, and the side suction hole 13 is located between the blocking balloon 2 and the suction head 10.

[0054] The side suction port 13 is connected to the delivery chamber 112 and the suction chamber 114 inside the suction tube 1. When the suction device is connected to the suction chamber 114 of the catheter seat 11 for negative pressure suction, both the suction head 10 and the side suction port 13 can perform negative pressure suction to remove the thrombus. The side suction port 13 and the suction head 10 form a three-dimensional suction network, which can actively and timely remove any thrombus fragments that may fall off, avoiding the possibility of small thrombus escape. At the same time, it avoids the risk of small thrombus escape after the thrombus treatment device is withdrawn from the blood vessel.

[0055] A second stress-relieving tube 12 is provided between the catheter seat 11 and the suction tube 1. The second stress-relieving tube 12 is fixed on the catheter seat 11 and sleeved on the suction tube 1. The second stress-relieving tube 12 has the same function as the first stress-relieving tube 9. The second stress-relieving tube 12 can absorb and disperse the alternating stress at the connection point between the suction tube 1 and the catheter seat 11, avoid stress concentration that could lead to breakage at the connection point, and greatly extend the service life and reliability of the product.

[0056] The catheter hub 11 includes a second tube body 111, which contains a delivery chamber 112, a second filling chamber 113, and an aspiration chamber 114. A corresponding aspiration device can be installed on the aspiration chamber 114 to apply negative pressure, which is responsible for aspirating the thrombus around the aspiration head 10 and the side aspiration port 13. A pressurizing device can be installed on the second filling chamber 113 to inflate and occlude the balloon 2. The delivery chamber 112 extends along the length of the aspiration tube 1 and is connected to the aspiration tube 1. An extension tube 4 is located inside the delivery chamber 112. The second filling chamber 113 and the aspiration chamber 114 are located on both sides of the delivery chamber 112, and the aspiration chamber 114 is connected to the delivery chamber 112.

[0057] The occlusion balloon 2 is connected to the suction tube 1 by welding or bonding. The side suction hole 13 is made by laser or stamping. The suction head 10 is connected to the suction tube 1 by welding.

[0058] The working principle of this application is as follows:

[0059] In actual operation, the suction cannula 1 with the distal end of the occlusion balloon 2 is first delivered to the proximal end of the thrombus in the target blood vessel. Then, the occlusion balloon 2 is inflated, causing it to expand and adhere to the blood vessel wall, temporarily and completely blocking the blood flow from the proximal end to the distal end, creating a static, blood-free operating environment for subsequent steps. The extension tube 4, puncture device 7, and uninflated drag balloon 5 are then inserted from the delivery chamber 112. The enhanced rigidity of the puncture device 7 is used to penetrate the thrombus, allowing the uninflated collection segment 51 to completely cross the thrombus. Subsequently, the drag balloon 5 is inflated by the pressurizing device on the first filling chamber 83, causing the metal wire assembly integrated on the surface of its proximal small diameter segment to pierce the proximal end of the thrombus, achieving point-like and firm mechanical anchoring. Then, the balloon is fully inflated to form a stable force-bearing surface. During pullback, the stepped structure generates a smooth dragging force, pulling the thrombus as a whole towards the inner lumen of the suction tube 1. If the thrombus breaks up or the plaque falls off, generating new emboli, the collection section 51 will also drag the thrombus along with the new emboli to the suction tube 1. When the anchored and dragged thrombus approaches the suction head 10, the larger opening of the suction head 10 can more smoothly guide the thrombus into the lumen of the suction tube 1. Through the negative pressure device installed in the suction chamber 114, the suction head 10 and the side suction port 13 perform active negative pressure suction, forming a three-dimensional suction flow field to clean up large thrombi and all possible thrombus fragments in the operating area, ensuring that the main thrombus and fragments are completely suctioned out of the body.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A thrombus removal device, characterized in that, include: A suction tube, used to aspirate blood clots; An occlusion balloon is disposed outside the suction tube, and an expansion cavity for controlling the expansion of the occlusion balloon is formed inside the suction tube; An extension tube is slidably connected inside the suction tube, and the direction of movement of the extension tube is the same as the length direction of the suction tube; A drag balloon is disposed outside the extension tube. The drag balloon is inflatable and is arranged along the length of the extension tube. The drag balloon includes a collection section, and the collection section is provided with a force-bearing surface for abutting the thrombus on the side facing the suction tube. When the drag balloon inflates, the collection section conforms to the target blood vessel.

2. The thrombectomy device according to claim 1, characterized in that: The drag balloon also includes a positioning section, which is connected to the force-bearing surface of the collection section. The area of ​​the positioning section connected to the collection section is smaller than the area of ​​the force-bearing surface. When the drag balloon expands, the positioning section squeezes the thrombus towards the thrombus side.

3. The thrombectomy device according to claim 2, characterized in that: The positioning segment is provided with a thrombus fixation component, and the thrombus fixation component is sleeved outside the positioning segment. When the side of the positioning segment compresses the thrombus, the thrombus fixation component expands along with the positioning segment and penetrates the thrombus.

4. The thrombectomy device according to claim 1, characterized in that: The force-bearing surface forms a right angle with the side of the collection section facing the thrombus.

5. The thrombectomy device according to claim 1, characterized in that: The extension tube is equipped with a puncture element and a Luer seat at its opposite ends, and the puncture element and the Luer seat are located on both sides of the suction tube. A first stress-relieving tube is provided between the Luer seat and the extension tube.

6. The thrombectomy device according to claim 5, characterized in that: The Luer seat includes a first tube body; The first tube body is provided with a guide wire cavity and a first filling cavity. The length direction of the guide wire cavity extends along the length direction of the suction tube, and the first filling cavity is located on the side of the guide wire cavity.

7. The thrombectomy device according to claim 1, characterized in that: The suction tube is provided with a suction head and a catheter seat at opposite ends. The suction head is located on the side of the suction tube facing the drag balloon. A second stress relief tube is provided between the catheter seat and the suction tube.

8. The thrombectomy device according to claim 7, characterized in that: The opening size of the suction head near the dragging balloon is larger than the opening size of the suction head connected to the suction tube.

9. The thrombectomy device according to claim 7, characterized in that: A side suction hole is provided on the side of the suction tube connected to the suction head, and the side suction hole is located between the occlusion balloon and the suction head.

10. The thrombectomy device according to claim 7, characterized in that: A second stress-relieving tube is provided between the catheter seat and the suction tube. The catheter seat includes a second tube body, and the second tube body is provided with a delivery chamber, a second filling chamber, and a suction chamber. The delivery chamber extends along the length direction of the suction tube and is connected to the suction tube. The second filling chamber and the suction chamber are located on both sides of the delivery chamber, and the suction chamber is connected to the delivery chamber.

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