Thrombus filtering device for intracranial venous sinus thrombus extraction and thrombus extraction and filtration device
By designing the inner and outer tubular structure of the thrombus filtration device, the thrombus capture net can contract and expand within the venous sinus, solving the problem of thrombus escape during venous sinus thrombectomy and achieving a highly efficient and safe thrombus prevention effect.
Patent Information
- Application Number
- CN202511380520.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2025-11-18
AI Technical Summary
During thrombectomy of the venous sinus, some thrombi can flow back from the venous sinus and escape into the pulmonary artery, causing pulmonary embolism, which seriously threatens the patient's life. Current technology is unable to effectively prevent this phenomenon.
Design a thrombus filtration device comprising an inner tube structure and an outer tube structure. By sliding the outer sheath, the thrombus-catching net contracts and expands within the venous sinus to form a barrier net that prevents thrombus escape.
It improves the safety and efficiency of sinus thrombectomy, effectively prevents thrombus escape, reduces surgical risks, and provides a safer treatment option.
Smart Images
Figure CN120959845A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, specifically to a thrombus filtration device and a thrombus retrieval and thrombus filtering device for intracranial venous sinus thrombectomy. Background Technology
[0002] Currently, cerebral venous thrombosis (CVT) is a special type of cerebrovascular disease characterized by obstruction of cerebral venous return and impaired cerebrospinal fluid absorption caused by various factors. Its incidence is low, accounting for 0.5% to 3.0% of all strokes, with a morbidity and mortality rate of 10% to 15%, and a mortality rate of up to 34.3% in severely ill patients. Heparin is widely used in clinical practice as a first-line anticoagulant, but 9% to 13% of patients still have a poor prognosis; especially for patients with intracranial hematoma, coma, psychiatric symptoms, or deep vein thrombosis, the mortality rate reaches 53%. The American Heart Association (AHA) / American Stroke Association (ASA) Statement on the Diagnosis and Treatment of Cerebral Venous Thrombosis indicates that endovascular treatment may be considered for comatose patients without substantial intracranial lesions and significant space-occupying effects, or for patients whose condition worsens after standard anticoagulation therapy. The "Guidelines for the Diagnosis and Treatment of Intracranial Venous Thrombosis in China 2019" state that for patients with cerebral venous thrombosis who progress despite standard anticoagulation therapy, endovascular treatment options such as sinus thrombolysis and mechanical thrombectomy may be used depending on the specific circumstances. Endovascular treatment is relatively safe and effective in achieving rapid recanalization of the venous sinuses in patients with severe cerebral venous sinus thrombosis (CVST), thereby reversing neurological deficits.
[0003] In related technologies, mechanical thrombectomy of intracranial venous sinuses involves inserting a catheter and thrombectomy device into the venous sinus to directly aspirate / loosen / remove the thrombus within the blood vessel, thereby rapidly restoring blood flow to the venous sinus. The advantages of mechanical thrombectomy lie in its high efficiency and targeted approach, which can quickly improve patients' clinical symptoms and reduce mortality and disability rates.
[0004] However, during thrombectomy of the venous sinus, a large number of intravascular thrombi detach due to mechanical action. Although most of the detached thrombi can be effectively removed through the thrombectomy stent or aspiration catheter, some thrombi may still flow back from the venous sinus and escape into the pulmonary artery; if the amount of escaped thrombi is large, it may lead to pulmonary embolism, which can seriously threaten the patient's life.
[0005] Therefore, those skilled in the art urgently need to prevent the thrombus from escaping from the venous sinus to the pulmonary artery during the thrombectomy process. Summary of the Invention
[0006] This application provides a thrombus filtering device and a thrombus retrieval and filtering device for intracranial venous sinus thrombectomy, which can filter and prevent thrombus from escaping back from the venous sinus during the venous sinus thrombectomy process.
[0007] In a first aspect, embodiments of this application provide a thrombus filtering device for intracranial venous sinus thrombectomy, comprising: an inner tubular structure including a thrombus-catching net that can be folded and opened, and a catheter for a thrombectomy stent to pass through, wherein the thrombus-catching net is fixed to the insertion end of the catheter; The outer tube structure includes an outer sheath, which is slidably and coaxially sleeved around the catheter. When the outer sheath slides to cover the thrombus-catching net, the thrombus-catching net is in a contracted state, contracted within the gap between the outer sheath and the catheter. When the outer sheath slides to detach from the thrombus-catching net, the thrombus-catching net is in an open state.
[0008] In conjunction with the first aspect, in one embodiment, the thrombus-catching net comprises: The capture net body, which opens to form a frustum, has a small circular opening and a large circular opening, with the large circular opening facing the side end face of the insertion end. A sliding ring is slidably fitted onto the conduit and is fixed to the small circular opening; An elastically expanding ring fixed to the conduit by an elastic structure is fixed to the large circular opening; Two or more inclined support rods, with their ends fixed to a sliding ring and an elastically expanding ring, respectively.
[0009] In conjunction with the first aspect, in one embodiment, the elastic structure includes two or more elastic rods, the elastic rods are inclined, one end of the elastic rod is fixed to the outer circular surface of the guide tube, and the other end is fixed to the elastically expanding ring; the elastic rods and the inclined support rods are inclined in opposite directions.
[0010] In conjunction with the first aspect, in one embodiment, the thrombus-catching net is located at a predetermined distance from the side end face of the insertion end of the catheter.
[0011] In conjunction with the first aspect, in one embodiment, a catheter handle is provided at the end of the catheter away from the insertion end, and an outer sheath handle is provided at the end of the outer sheath away from the insertion end, wherein the outer sheath handle is partially sleeved on the catheter handle when the thrombus capture net is in the open state.
[0012] In conjunction with the first aspect, in one embodiment, the maximum aperture of the capture net body is 600 μm, and the outer diameter of the capture net body in the open state is in the range of 6 to 12 mm.
[0013] Secondly, embodiments of this application provide a thrombectomy and thrombectomy device for intracranial venous sinus thrombectomy, comprising: the aforementioned thrombectomy and thrombectomy device; A microcatheter, inserted into the catheter of a thrombus filtration device, is used to insert a thrombectomy stent; the thrombus-catching net of the thrombus filtration device is used to prevent detached thrombi from escaping during thrombectomy when it is in an open state.
[0014] In conjunction with the second aspect, in one embodiment, the thrombus-catching net comprises: The capture net body, which opens to form a frustum, has a small circular opening and a large circular opening, with the large circular opening facing the side end face of the insertion end. A sliding ring is slidably fitted onto the conduit and is fixed to the small circular opening; An elastically expanding ring fixed to the conduit by an elastic structure is fixed to the large circular opening; Two or more inclined support rods, with their ends fixed to a sliding ring and an elastically expanding ring, respectively.
[0015] In conjunction with the second aspect, in one embodiment, the elastic structure includes two or more elastic rods, the elastic rods are inclined, one end of the elastic rod is fixed to the outer circular surface of the guide tube, and the other end is fixed to the elastically expanding ring; the elastic rods and the inclined support rods are inclined in opposite directions.
[0016] In conjunction with the second aspect, in one embodiment, a catheter handle is provided at the end of the catheter away from the insertion end, and an outer sheath handle is provided at the end of the outer sheath away from the insertion end, and the outer sheath handle is partially sleeved on the catheter handle when the thrombus capture net is in the open state.
[0017] The beneficial effects of the technical solutions provided in this application include at least the following: 1. The thrombus filtering device of this application, through a double-layer tube structure design, is inserted into the target venous position when the outer sheath slides to cover the thrombus-catching net, i.e., when the thrombus-catching net is in a contracted state; then, after the outer sheath slides to detach from the thrombus-catching net, the thrombus-catching net is released and opened. The opened thrombus-catching net forms a barrier within the venous vessel to prevent thrombus escape. The thrombus filtering device of this application fully considers the complexity and risk of intracranial venous sinus thrombectomy. Through the innovative thrombus-catching net structure, it effectively improves the safety and efficiency of the operation, providing a safer treatment option for patients with severe cerebral venous sinus thrombosis.
[0018] 2. The thrombus filtering device of this application comprises a sliding ring, an elastic expanding ring, and two or more inclined support rods forming a support skeleton for the capture net body, and forming a structural basis for the capture net body to contract and expand. The elastic expanding ring is fixed to the outer surface of the catheter through an elastic structure to prevent the elastic expanding ring from moving relative to the catheter. The sliding ring is designed to be flexible and can slide up and down the catheter, so that the capture net body can contract in the gap between the outer sheath and the catheter when inserted (i.e., the contracted state). The inclined support rods work together with the elastic expanding ring to ensure that the capture net body remains stable when it is expanded (i.e., the expanded state), so that the elastic expanding ring can return to its shape after the outer sheath is removed, so that the capture net body can form a barrier net in the vein to prevent thrombus escape.
[0019] 3. In the thrombus filtration device of this application, during the process of the outer sheath sliding from the relative thrombus capture net to covering the thrombus capture net, the elastic expanding ring is compressed into the gap between the outer sheath and the catheter, and the supporting skeleton formed by the sliding ring, the elastic expanding ring and two or more inclined support rods moves the capture net body in a small range away from the insertion end, and the thrombus capture net switches from a contracted state to an open state, forming a barrier net in the vein; the thrombus filtration device of this application has an ingeniously designed release and retrieval mechanism, is easy to operate, greatly shortens the operation time, and reduces the operation risk.
[0020] 4. The thrombectomy and thrombectomy device of this application can prevent thrombus escape while removing thrombi, and the two are carried out simultaneously, which further improves the safety and reliability of thrombectomy and provides a safer treatment option for patients with severe cerebral venous sinus thrombosis. Attached Figure Description
[0021] 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.
[0022] Figure 1 A schematic diagram of the inner tube structure provided in the embodiments of this application (including the catheter handle, the catheter and the thrombus trapping net). Figure 2 This is a structural diagram of the thrombus-catching net provided in the embodiments of this application; Figure 3 A schematic diagram of the thrombus filtering device provided in the embodiments of this application (the figure shows the state of the thrombus filtering device being inserted into the blood vessel). Figure 4 This is a schematic diagram of the use of the thrombectomy and thrombectomy device provided in the embodiments of this application (the thrombus capture net shown in the figure is in the open state).
[0023] In the diagram: 1. Catheter handle; 2. Catheter; 21. Insertion end; 3. Thrombus capture net; 4. Outer sheath handle; 5. Outer sheath tube; 6. Microcatheter; 7. Thrombus retrieval stent; 31. Sliding ring; 32. Inclined support rod; 33. Elastic expansion ring; 34. Elastic rod; 35. Capture net body. Detailed Implementation
[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0025] This application provides a thrombus filtering device for intracranial sinus thrombectomy. During the sinus thrombectomy process, it is also necessary to prevent thrombi from flowing back from the sinus and escaping into the pulmonary artery. This solves the technical problem that some thrombi may still flow back from the sinus and escape into the pulmonary artery during the sinus thrombectomy process, causing pulmonary embolism and seriously threatening the patient's life.
[0026] It is worth noting that the development of mechanical thrombectomy devices has mainly focused on arterial thrombectomy, with very few medical devices specifically designed for venous sinus thrombectomy. While guidewires, catheters, and thrombectomy stents are generally interchangeable in arterial and venous thrombectomy, in terms of thrombus protection, due to the difference in blood flow direction between arteries and veins, the thrombus protection devices used in the arterial system are not structurally and functionally suitable for intracranial venous sinus thrombectomy.
[0027] It is worth noting that the thrombus filtering device of this application, specifically designed for intracranial venous sinus thrombectomy / thrombectomy, differs from existing arterial cerebral thrombosis protection devices, although both capture thrombi. However, due to the opposite blood flow directions in arteries and veins, their design structures and capture methods are different. Specifically, in arterial cerebral thrombosis protection devices, intracranial arterial blood flows from the heart, ascends through the aortic arch, and enters intracranial vessels via the vertebral and carotid arteries. Even small thrombi can cause cerebral infarction; therefore, these devices aim to intercept ascending arterial thrombi, requiring a mesh size of approximately 200 μm. In contrast, the thrombus filtering device of this application is primarily used to capture descending venous thrombi within intracranial veins. Since small thrombi in the venous system can be metabolized by circulation, the mesh size of the protective device is designed to be approximately 600 μm to minimize blood flow interference. The different blood flow direction and mesh size requirements between the arterial cerebral thrombosis protection device and the venous sinus thrombus filtering device also influence the device's design structure and capture method.
[0028] This application provides a highly efficient, safe, and easy-to-operate intracranial venous sinus thrombectomy thrombus filtering device, which is expected to bring a new breakthrough in the treatment of patients with cerebral venous thrombosis.
[0029] Firstly, such as Figure 1 , Figure 2 and Figure 3 As shown, this application discloses an embodiment of a thrombus filtering device for intracranial venous sinus thrombectomy, the thrombus filtering device comprising an inner tube structure and an outer tube structure.
[0030] The inner tubular structure includes a thrombus-catching net 3 and a catheter 2. The thrombus-catching net 3 can be contracted and expanded, and the catheter 2 is used for the passage of the thrombus-retrieval stent 7. The thrombus-catching net 3 is fixed to the insertion end 21 of the catheter 2. Specifically, the insertion end 21 is used for insertion into a vein.
[0031] Specifically, catheter 2 serves as a carrier, running through the entire device. It possesses excellent flexibility and pushability to adapt to the complex anatomical pathways of intracranial venous sinuses. Its effective tube length is 95-120 cm, and its outer diameter is 2.3-2.5 mm.
[0032] The outer tube structure includes an outer sheath 5, which is slidably and coaxially fitted around the catheter 2. When the outer sheath 5 slides to cover the thrombus-catching net 3, the thrombus-catching net 3 is in a contracted state, contracted within the gap between the outer sheath 5 and the catheter 2. After the outer sheath 5 slides away from the thrombus-catching net 3, the thrombus-catching net 3 is in an open state, forming a barrier within the vein to prevent thrombus escape. Specifically, the open thrombus-catching net 3 adapts to the inner diameter of the vein to form a barrier.
[0033] The thrombus filtering device of this application, through a double-layer tube structure design, is inserted into the target venous position when the outer sheath 5 slides to cover the thrombus-catching net 3, i.e., when the thrombus-catching net 3 is in a contracted state; then, after the outer sheath 5 slides away from the thrombus-catching net 3, the thrombus-catching net 3 is released and opened. The opened thrombus-catching net 3 forms a barrier net in the venous blood vessel to prevent thrombus escape. The thrombus filtering device of this application fully considers the complexity and risk of intracranial venous sinus thrombectomy. Through the innovative thrombus-catching net structure, it effectively improves the safety and efficiency of the operation, providing a safer treatment option for patients with severe cerebral venous sinus thrombosis.
[0034] The thrombus filtration device of this application enters through a venous route and is precisely positioned at the jugular vein. Combined with aspiration or mechanical thrombectomy, it effectively prevents thrombus escape and achieves efficient capture and removal of thrombi.
[0035] It is worth noting that when preventing thrombus escape, the thrombus escape is prevented in the direction of venous blood flow.
[0036] In one embodiment, such as Figure 2 As shown, the thrombus capture net 3 includes a capture net body 35, a sliding ring 31, an elastically expanding ring 33, and two or more inclined support rods 32.
[0037] When the capture net body 35 is opened, it forms a frustum. The frustum capture net body 35 has a small circular opening and a large circular opening, wherein the large circular opening faces the side end face of the insertion end 21, and the small circular opening is away from the side end face of the insertion end 21.
[0038] The sliding ring 31 is slidably sleeved on the guide tube 2, and the sliding ring 31 is fixedly set on the small round opening of the capture net body 35.
[0039] The elastic expansion ring 33 is fixed to the outer circular surface of the guide tube 2 by an elastic structure, and the elastic expansion ring 33 is set at the large circular opening of the capture net body 35.
[0040] Both ends of each inclined support rod 32 are fixed to the sliding ring 31 and the elastically expanding ring 33, respectively.
[0041] Specifically, the elastic expansion ring 33 of the thrombus-catching net 3 in its open state adapts to the inner diameter of the vein, and the elastic expansion ring 33 abuts against the inner wall of the vein.
[0042] The thrombus filtration device of this application comprises a sliding ring 31, an elastic expanding ring 33, and two or more inclined support rods 32 forming a support frame for the capture net body 35, and forming a structural basis for the capture net body 35 to contract and expand. The elastic expanding ring 33 is fixed to the outer surface of the catheter 2 by an elastic structure to prevent the elastic expanding ring 33 from moving relative to the catheter 2. The sliding ring 31 is designed to be flexible and can slide up and down the catheter 2, so that the capture net body 35 can contract in the gap between the outer sheath 5 and the catheter 2 when inserted (i.e., the contracted state). The inclined support rods 32 and the elastic expanding ring 33 work together to ensure that the capture net body 35 remains stable when it is expanded (i.e., the expanded state), so that the elastic expanding ring 33 can return to its shape after the outer sheath 5 is removed, so that the capture net body 35 forms a barrier net in the vein to prevent thrombus escape.
[0043] In one embodiment, such as Figure 2 As shown, the elastic structure includes two or more elastic rods 34. The elastic rods 34 are inclined, with one end fixed to the outer circular surface of the conduit 2 and the other end fixed to the elastic expansion ring 33. The elastic rods 34 and the inclined support rods 32 are inclined in opposite directions. Specifically, one end of the elastic rod 34 is close to the side end face of the insertion end 21, and the other end is fixed to the outer circular surface of the conduit 2.
[0044] Preferably, one end of the elastic rod 34 is tightly welded to the outer surface of the guide tube 2, and the other end is tightly attached to the elastic expansion ring 33, which serves to fix the position of the capture net body 35 and ensure that it will not shift during operation.
[0045] In the thrombus filtration device of this application, during the process of the outer sheath 5 detaching from and sliding away from the relative thrombus capture net 3 to cover the thrombus capture net 3, the elastic expanding ring 33 is compressed into the gap between the outer sheath 5 and the catheter 2, and the supporting skeleton formed by the sliding ring 31, the elastic expanding ring 33 and two or more inclined support rods 32 moves the capture net body 35 in a small range away from the insertion end 21, and the thrombus capture net 3 switches from a contracted state to an open state, forming a barrier net in the vein; the thrombus filtration device of this application has an ingeniously designed release and retrieval mechanism, is easy to operate, greatly shortens the operation time, and reduces the operation risk.
[0046] Meanwhile, the thrombus filtration device of this application also has good biocompatibility, which can reduce the stimulation and damage to the vascular endothelium and is beneficial to the patient's postoperative recovery.
[0047] Furthermore, in one embodiment, the thrombus-catching net 3 is positioned at a predetermined distance from the side end face of the insertion end 21 of the catheter 2. Preferably, the predetermined distance is 1 cm. This predetermined distance facilitates reaching the target location of the vein during insertion.
[0048] Specifically, the distance between the end of the elastic rod 34 and the side face of the insertion end 21 is 1 cm.
[0049] Furthermore, in one embodiment, the end of the catheter 2 away from the insertion end 21 is provided with a catheter handle 1, and the end of the outer sheath 5 away from the insertion end 21 is provided with an outer sheath handle 4, and the outer sheath handle 4 is partially sleeved on the catheter handle 1 when the thrombus capture net 3 is in the open state.
[0050] Specifically, the catheter handle 1 and the outer sheath handle 4 not only facilitate forceful movement, but the outer sheath handle 4 can also be partially fitted onto the catheter handle 1 when the thrombus capture net 3 is in the open state, so that the outer sheath tube 5 has a larger travel space. At the same time, the outer sheath handle 4 makes the outer sheath tube 5 and the catheter 2 form a stable and uniform gap.
[0051] Specifically, such as Figure 3 As shown, the thrombus-catching net 3 is in a contracted state at this time, and the entire thrombus-filtering device is in the state of being inserted into the vein. After being inserted into the vein, the outer sheath handle 4 can be moved downwards to make the thrombus-catching net 3 open.
[0052] In one embodiment, the maximum aperture of the capture net body 35 is 600 μm, and the outer diameter of the capture net body 35 in the open state is in the range of 6 to 12 mm.
[0053] Specifically, the thrombus capture net 3 features adaptable mesh and adjustable elasticity. After release and opening, it effectively wraps around detached thrombi, preventing them from flowing back to the pulmonary artery with intracranial venous blood, further improving the safety and reliability of thrombectomy. Specifically, the design of the thrombus capture net 3 fully considers the size of blood vessels. The thrombus capture net can open to different degrees after release, with a maximum diameter of 12mm and a minimum diameter of 6mm, thus adapting to blood vessels with an outer diameter ranging from 6 to 12mm. At the maximum diameter of 12mm, the maximum mesh aperture is 600um. As the blood vessel diameter decreases, the mesh aperture also decreases relatively due to the contraction of the elastic support ring. At the minimum aperture of 6mm, the aperture is greater than 300um.
[0054] Specifically, the capture net body 35 is made of special materials (such as nickel-titanium woven filter mesh), which has good biocompatibility and durability, and can reduce damage to the inner wall of blood vessels while capturing thrombi.
[0055] The thrombus capture net 3 of this application adopts a special structural design, which can adapt to the thrombus size of different veins, and can more effectively capture thrombi in veins of different sizes, reducing the risk of thrombus escape.
[0056] The working principle of the thrombus filtration device in this application is as follows: like Figure 3 The thrombus filtering device shown illustrates the state of the thrombus filtering device during insertion (i.e., the thrombus trapping net 3 is in a contracted state). The inner tubular structure is fitted into the outer sheath 5, so that the thrombus trapping net 3 fits tightly against the insertion end 21 of the catheter 2, reducing the volume of the thrombus filtering device and facilitating passage through the tortuous intracranial venous sinus path.
[0057] Once the thrombus filtering device reaches the predetermined position under the pre-guided guidewire, the outer sheath 5 is moved proximally relative to the catheter 2 (away from the insertion end 21) by operating the outer sheath handle 4, thereby releasing the thrombus-catching net 3, which switches from a contracted state to an open state. After being freed from the constraint of the outer sheath 5, the thrombus-catching net 3 rapidly unfolds under the action of the inclined support rod 32 and the elastic expanding ring 33, effectively capturing the thrombus.
[0058] like Figure 4 As shown, in a second aspect, this application also discloses an embodiment of a thrombectomy and thrombectomy device for intracranial venous sinus thrombectomy, the thrombectomy and thrombectomy device comprising a microcatheter 6 and the aforementioned thrombus filtration device.
[0059] The microcatheter 6 is inserted into the catheter 2 of the thrombus filtration device and is used to insert the thrombus retrieval stent 7; the capture net body 35 of the thrombus filtration device is used to be in an open state during thrombus retrieval to prevent the escape of detached thrombi.
[0060] The thrombectomy and thrombectomy device of this application can simultaneously remove thrombi and prevent thrombus escape, thus improving the safety and reliability of thrombectomy and providing a safer treatment option for patients with severe cerebral venous sinus thrombosis.
[0061] Specifically, the working principle of the plug removal and filter device is as follows: During intracranial vein thrombectomy, the thrombus filtering device is first precisely positioned in the intracranial vein, mainly the jugular vein segment, through the outer sheath 5.
[0062] Subsequently, a thrombectomy stent 7 is inserted through a microcatheter 6 to loosen or grasp the thrombus.
[0063] During this process, the thrombus capture net 3 effectively intercepts thrombi that may detach due to mechanical operation, preventing them from escaping to the pulmonary artery.
[0064] After the thrombectomy is completed, the thrombus filtration device, along with the captured thrombus, is removed from the body, completing the entire intracranial venous sinus thrombectomy process.
[0065] Regarding the thrombectomy and thrombectomy device, in one embodiment, the thrombus capture net 3 includes a capture net body 35, a sliding ring 31, an elastically expanding ring 33, and two or more inclined support rods 32.
[0066] When the capture net body 35 is opened, it forms a frustum. The frustum capture net body 35 has a small circular opening and a large circular opening, wherein the large circular opening faces the side end face of the insertion end 21, and the small circular opening is away from the side end face of the insertion end 21.
[0067] The sliding ring 31 is slidably sleeved on the guide tube 2 and fixedly set at the small circular opening of the capture net body 35. The elastically expanding ring 33 is fixed to the outer circular surface of the guide tube 2 by an elastic structure and is set at the large circular opening of the capture net body 35. The two ends of each inclined support rod 32 are fixed to the sliding ring 31 and the elastically expanding ring 33, respectively.
[0068] The thrombus retrieval and thrombus filtering device of this application comprises a sliding ring 31, an elastic expanding ring 33, and two or more inclined support rods 32 forming a support frame for the capture net body 35, and forming a structural basis for the capture net body 35 to contract and expand. The elastic expanding ring 33 is fixed to the outer surface of the catheter 2 by an elastic structure to prevent the elastic expanding ring 33 from moving relative to the catheter 2. The sliding ring 31 is designed to be flexible and can slide up and down the catheter 2, so that the capture net body 35 can contract in the gap between the outer sheath 5 and the catheter 2 when inserted (i.e., the contracted state). The inclined support rods 32 and the elastic expanding ring 33 work together to ensure that the capture net body 35 remains stable when it is opened (i.e., the open state), so that the elastic expanding ring 33 can return to its shape after the outer sheath 5 is removed, so that the capture net body 35 forms a barrier net in the vein to prevent thrombus escape.
[0069] Regarding the plug removal and filter device, in one embodiment, such as Figure 2 As shown, the elastic structure includes two or more elastic rods 34. The elastic rods 34 are inclined, with one end fixed to the outer circular surface of the conduit 2 and the other end fixed to the elastic expansion ring 33. The elastic rods 34 and the inclined support rods 32 are inclined in opposite directions. Specifically, one end of the elastic rod 34 is close to the side end face of the insertion end 21, and the other end is fixed to the outer circular surface of the conduit 2.
[0070] Preferably, one end of the elastic rod 34 is tightly welded to the outer surface of the guide tube 2, and the other end is tightly attached to the elastic expansion ring 33, which serves to fix the position of the capture net body 35 and ensure that it will not shift during operation.
[0071] The thrombus retrieval and thrombus filtering device of this application, during the process of the outer sheath 5 sliding from the relative thrombus catching net 3 to covering the thrombus catching net 3, the elastic expanding ring 33 is compressed into the gap between the outer sheath 5 and the catheter 2, and the supporting skeleton formed by the sliding ring 31, the elastic expanding ring 33 and two or more inclined support rods 32 moves the catching net body 35 in a small range away from the insertion end 21, and the thrombus catching net 3 switches from the contracted state to the open state, forming a barrier net in the vein; the thrombus filtering device of this application has an ingeniously designed release and retrieval mechanism, is easy to operate, greatly shortens the operation time, and reduces the operation risk.
[0072] Regarding the thrombectomy and thrombectomy device, in one embodiment, the end of the catheter 2 away from the insertion end 21 is provided with a catheter handle 1, and the end of the outer sheath 5 away from the insertion end 21 is provided with an outer sheath handle 4, and the outer sheath handle 4 is partially sleeved on the catheter handle 1 when the thrombus capture net 3 is in the open state.
[0073] The catheter handle 1 and the outer sheath handle 4 not only facilitate forceful movement, but the outer sheath handle 4 can also be partially fitted onto the catheter handle 1 when the thrombus capture net 3 is in the open state, so that the outer sheath tube 5 has a larger travel space. At the same time, the outer sheath handle 4 makes the outer sheath tube 5 and the catheter 2 form a stable and uniform gap.
[0074] In the description of this application, it should be noted that the terms "upper," "lower," 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 this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0075] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0076] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A thrombus filtering device for intracranial venous sinus thrombectomy, characterized in that, Include: The inner tube structure includes a thrombus-catching net (3) that can be folded and opened, and a catheter (2) through which a thrombus-catching stent (7) passes, the thrombus-catching net (3) being fixed to the insertion end (21) of the catheter (2). The outer tube structure includes an outer sheath (5), which is slidably and coaxially sleeved on the outside of the catheter (2). When the outer sheath (5) slides to cover the thrombus trapping net (3), the thrombus trapping net (3) is in a contracted state, which is contracted in the gap between the outer sheath (5) and the catheter (2). After the outer sheath (5) slides to detach from the thrombus trapping net (3), the thrombus trapping net (3) is in an open state.
2. The thrombus filtering device for intracranial venous sinus thrombectomy as described in claim 1, characterized in that, The thrombus-catching net (3) comprises: The capture net body (35) is a frustum-shaped surface when opened, and it has a small round opening and a large round opening, with the large round opening facing the side end face of the insertion end (21). A sliding ring (31) is slidably sleeved on the conduit (2) and fixed to the small round opening; The elastically expanding ring (33) is fixed to the conduit (2) by an elastic structure and is fixed to the large circular opening; Two or more inclined support rods (32) are fixed at both ends to a sliding ring (31) and an elastically expanding ring (33), respectively.
3. A thrombus filtering device for intracranial venous sinus thrombectomy as described in claim 2, characterized in that, The elastic structure includes two or more elastic rods (34), which are inclined and one end of the elastic rod (34) is fixed to the outer surface of the guide tube (2), and the other end is fixed to the elastic opening ring (33); the elastic rod (34) and the inclined support rod (32) are inclined in opposite directions.
4. A thrombus filtering device for intracranial venous sinus thrombectomy as described in claim 1, characterized in that, The thrombus capture net (3) is at a set distance from the side end face of the insertion end (21) of the catheter (2).
5. A thrombus filtering device for intracranial venous sinus thrombectomy as described in claim 1, characterized in that: The catheter (2) has a catheter handle (1) at one end away from the insertion end (21), and the outer sheath (5) has an outer sheath handle (4) at one end away from the insertion end (21). The outer sheath handle (4) is partially fitted onto the catheter handle (1) when the thrombus capture net (3) is in the open state.
6. A thrombus filtering device for intracranial venous sinus thrombectomy as described in claim 2, characterized in that: The maximum aperture of the capture net body (35) is 600um, and the outer diameter of the capture net body (35) in the open state is in the range of 6~12mm.
7. A thrombectomy and thrombectomy device for intracranial venous sinus thrombectomy, characterized in that, Include: The thrombus filtering device as described in claim 1; The microcatheter (6) is inserted into the catheter (2) of the thrombus filtration device and is used to insert the thrombus retrieval stent (7); the thrombus catching net (3) of the thrombus filtration device is used to be in an open state during thrombus retrieval to prevent the escape of detached thrombi.
8. The thrombectomy and thrombectomy device for intracranial venous sinus thrombectomy as described in claim 7, characterized in that, The thrombus-catching net (3) comprises: The capture net body (35) is a frustum-shaped surface when opened, and it has a small round opening and a large round opening, with the large round opening facing the side end face of the insertion end (21). A sliding ring (31) is slidably sleeved on the conduit (2) and fixed to the small round opening; The elastically expanding ring (33) is fixed to the conduit (2) by an elastic structure and is fixed to the large circular opening; Two or more inclined support rods (32) are fixed at both ends to a sliding ring (31) and an elastically expanding ring (33), respectively.
9. A thrombectomy and thrombectomy device for intracranial venous sinus thrombectomy as described in claim 8, characterized in that, The elastic structure includes two or more elastic rods (34), which are inclined and one end of the elastic rod (34) is fixed to the outer surface of the guide tube (2), and the other end is fixed to the elastic opening ring (33); the elastic rod (34) and the inclined support rod (32) are inclined in opposite directions.
10. The thrombectomy and thrombectomy device for intracranial venous sinus thrombectomy as described in claim 7, characterized in that: The catheter (2) has a catheter handle (1) at one end away from the insertion end (21), and the outer sheath (5) has an outer sheath handle (4) at one end away from the insertion end (21). The outer sheath handle (4) is partially fitted onto the catheter handle (1) when the thrombus capture net (3) is in the open state.