Thrombus filtering system

Abstract

The utility model relates to a thrombus filtration system, the thrombus filtration system comprises a delivery device and a filtration device, the delivery device comprises a connecting piece, a handle assembly and a sheathing canal, the handle assembly comprises a sliding assembly, the near end of the sheathing canal is connected with the sliding assembly, and the filtration device is connected with the connecting piece. The near end of the connecting piece penetrates through the near end of the sheathing canal and then is fixed in the handle assembly, the far end of the connecting piece is connected with the filtering device, the filtering device can be contained in the far end of the sheathing canal, and the sliding assembly can drive the sheathing canal to move relative to the connecting piece and the filtering device. The thrombus filtering system can intercept and capture fallen thrombus or calcification fragments in the operation process so as to prevent the thrombus or calcification fragments from rushing to the telecentric end along with blood flow to cause vascular embolism, and therefore the risks of local pain, tissue necrosis, hemiplegia, dementia and even death of a patient are avoided.

Description

Technical Field

[0001] This utility model relates to the field of interventional medicine, specifically to a thrombus filtration system. Background Technology

[0002] Interventional therapy is a rapidly developing emerging discipline that integrates imaging diagnosis and clinical treatment. It has now become one of the three pillars of clinical medicine, alongside traditional internal medicine and surgery. Vascular thrombus filtration systems primarily target cardiovascular diseases. Emboli in cerebral embolism and stroke mainly originate from the heart, heart valves, and aorta. Procedures performed on these structures, such as aortic cannulation and valve repair, can induce the formation and detachment of emboli of varying sizes and types, leading to embolic brain injury ranging from latent ischemic foci to large-scale or even fatal strokes. Various devices are known to exist within blood vessels and the carotid artery to prevent emboli from dislodging and reaching the brain.

[0003] A thrombus filtration system is a medical device used in cardiovascular interventional procedures. Its main function is to intercept and capture any thrombi or calcified fragments that may detach during the procedure, preventing these emboli from traveling with the bloodstream to the distal end and causing vascular embolism. Vascular embolism can lead to localized pain, tissue necrosis, hemiplegia, dementia, and even death in patients. Utility Model Content

[0004] To overcome the problems existing in the prior art, this utility model provides a thrombus filtration system.

[0005] The solution to the technical problem of this utility model is to provide, in some embodiments of this utility model, a thrombus filtration system including a delivery device and a filtering device, wherein the delivery device includes a connector, a handle assembly and a sheath, the handle assembly includes a sliding assembly, the proximal end of the sheath is connected to the sliding assembly, the proximal end of the connector passes through the proximal end of the sheath and is fixed in the handle assembly, the distal end of the connector is connected to the filtering device, the filtering device can be housed in the distal end of the sheath, and the sliding assembly can drive the sheath to move relative to the connector and the filtering device.

[0006] In some embodiments of this utility model, the sheath includes a sheath body and a receiving portion, the proximal end of the receiving portion is connected to the distal end of the sheath body, the proximal end of the sheath body is connected to the sliding assembly, and the filtering device can be housed in the receiving portion.

[0007] In some embodiments of this utility model, the handle assembly further includes a housing, and the sliding assembly includes a limiting member, a sliding member, and a button. The limiting member is sleeved on the sliding member, and the proximal end of the sliding member is exposed outside the proximal end of the limiting member. One end of the button is connected to the proximal end of the sliding member, and the other end passes through the housing and is exposed outside the housing. The limiting member is fixed inside the housing, and the sliding member can move relative to the limiting member under the action of the button.

[0008] In some embodiments of this utility model, the proximal end of the sheath is fixed inside the sliding member, a portion of the sidewall of the limiting member extends outward to form a hollow extension, the sliding assembly further includes a fixing member, the distal end of the fixing member is connected to the proximal end of the extension, and the fixing member communicates with the extension, a through groove is provided on the sidewall of the sliding member corresponding to the position of the extension, after the proximal end of the connector passes through the sheath, it passes through the through groove into the extension and is fixed inside the fixing member.

[0009] In some embodiments of this utility model, a first sealing element is provided at the distal end of the sliding member, a second sealing element is provided at the proximal end of the sliding member, and the extension and the through groove are both provided between the first sealing element and the second sealing element.

[0010] In some embodiments of this utility model, the handle assembly further includes a protective member, the proximal end of which is connected to the distal end of the housing, and the distal end of the protective member is provided with a stitched portion.

[0011] In some embodiments of this utility model, the handle assembly further includes a hemostatic valve seat, which includes a main body, a first end cap, a second end cap, a third sealing element, a fourth sealing element, and a steel pipe. The third sealing element is disposed at the distal end of the main body, the first end cap is connected to the distal end of the main body, the fourth sealing element is disposed at the proximal end of the main body, the second end cap is connected to the proximal end of the main body, and the distal end of the steel pipe is connected to the proximal end of the sliding element. The proximal end of the steel pipe passes through the first end cap and the third sealing element and is housed within the main body.

[0012] In some embodiments of this utility model, the filtering device includes a filter screen body, the filter screen body includes a support and a connecting portion connected to the proximal end of the support. The connecting portion extends towards the proximal end to form a mating portion, and the mating portion is connected to the connector.

[0013] In some embodiments of this utility model, in a natural state, the diameter of the bracket gradually increases from the proximal end to the distal end. The bracket includes a support portion disposed at the distal end and a retraction portion disposed at the proximal end. The length of the retraction portion in the axial direction is greater than the length of the support portion in the axial direction, and the length of the support portion in the circumferential direction is greater than the length of the retraction portion in the axial direction.

[0014] In some embodiments of this utility model, the sheath includes a first cavity and a second cavity arranged along the axial direction of the sheath. The first cavity and the second cavity are disposed on the proximal side of the receiving part, and the volume of the second cavity is larger than the volume of the first cavity. The proximal end of the connector passes through the receiving part and the second cavity and is fixed in the handle assembly.

[0015] The beneficial effects of this invention are: the thrombus filtration system of this invention can intercept and capture detached thrombi or calcified fragments during surgery, so as to prevent these thrombi or calcified fragments from being carried by the blood flow to the distal end and causing vascular embolism, thereby avoiding the risk of local pain, tissue necrosis, hemiplegia, dementia or even death for the patient. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the thrombus filtration system provided in an embodiment of this utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the thrombus filtration system provided in an embodiment of this utility model.

[0018] Figure 3 This is an exploded structural diagram of the handle assembly of the thrombus filtration system provided in this embodiment of the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of the limiting component and sliding component of the thrombus filtration system provided in this embodiment of the utility model.

[0020] Figure 5 This is a schematic diagram of the exploded structure of the hemostatic valve seat of the thrombus filtration system provided in this embodiment of the utility model.

[0021] Figure 6 This is a three-dimensional structural diagram of the filtration device of the thrombus filtration system provided in this embodiment of the utility model.

[0022] Figure 7 This is a three-dimensional structural diagram of the expander of the thrombus filtration system provided in this embodiment of the utility model.

[0023] Explanation of reference numerals in the attached drawings: 100, Thrombus filtration system; 1, Delivery device; 11, Connector; 12, Handle assembly; 121, Sliding assembly; 1211, Limiting element; 1212, Sliding element; 1213, Button; 1214, Extension; 1215, Fixing element; 1216, Through groove; 1217, First seal; 1218, Second seal; 122, Housing; 123, Protective element; 1231, Suture; 124, Hemostatic valve seat; 1241, Main body; 1242, First end cap; 12 43. Second end cap; 1244. Third seal; 1245. Fourth seal; 1246. Steel pipe; 13. Sheath; 131. First cavity; 132. Second cavity; 133. Sheath body; 134. Storage section; 2. Filter device; 21. Filter screen body; 211. Bracket; 2111. Support section; 2112. Recycling section; 212. Joint section; 2121. Fitting section; 22. Filter screen; 3. Expander; 31. Tip head; 32. Loading section; 33. Support section; 34. Expander seat. Detailed Implementation

[0024] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0025] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0026] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0027] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0028] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the operator during the surgical procedure, "proximal" refers to the end closest to the operator during the surgical procedure, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial".

[0029] Please see Figure 1 and Figure 2This utility model provides a thrombus filtration system 100, which includes a delivery device 1 and a filtering device 2. The delivery device 1 includes a connector 11, a handle assembly 12, and a sheath 13. The handle assembly 12 includes a sliding assembly 121, and the proximal end of the sheath 13 is connected to the sliding assembly 121. The sheath 13 includes a first cavity 131 and a second cavity 132 arranged axially along the sheath 13, that is, the cavity of the sheath 13 is divided into two to form the first cavity 131 and the second cavity 132. The proximal end of the connector 11 passes through the first cavity 131 and is fixed in the handle assembly 12. The distal end of the connector 11 is connected to the filtering device 2, which is housed in the distal end of the sheath 13. The movement of the sliding assembly 121 causes the sheath 13 to move relative to the connector 11 and the filtering device 2. In a specific embodiment of this utility model, the connector 11 is a nickel-titanium wire. The connector 11 connects the filter device 2 to the handle assembly 12, making the filter device 2 and the connector 11 immovable relative to the handle assembly 12. By sliding the sliding assembly 121, the sheath 13 is moved relative to the connector 11 and the filter device 2. The sheath 13 moves proximally, releasing the filter device 2 housed in the distal end of the sheath 13, thereby allowing the filter device 2 to unfold and be released within the blood vessel. The first cavity 131 is for the connector 11 to pass through, and the second cavity 132 is for the instrument to pass through; therefore, the volume of the second cavity 132 is larger than the volume of the first cavity 131.

[0030] Please see Figure 2 The sheath 13 includes a sheath body 133 and a receiving portion 134. The proximal end of the receiving portion 134 is connected to the distal end of the sheath body 133, and the proximal end of the sheath body 133 is connected to the sliding assembly 121. The first cavity 131 and the second cavity 132 are disposed within the sheath body 133, and the filter device 2 can be stored within the receiving portion 134. That is, the first cavity 131 and the second cavity 132 are only disposed within the sheath body 133 and do not extend into the receiving portion 134. The diameter of the receiving portion 134 is larger than the diameter of the sheath body 133, thereby ensuring that the filter device 2 can be smoothly retracted and stored within the receiving portion 134.

[0031] Please see Figure 3The handle assembly 12 further includes a housing 122, which has a hollow cavity to accommodate other components. The sliding assembly 121 includes a limiting member 1211, a sliding member 1212, and a button 1213. The limiting member 1211 and the sliding member 1212 are housed within the housing 122. The limiting member 1211 is fitted onto the sliding member 1212, with the proximal end of the sliding member 1212 exposed beyond the proximal end of the limiting member 1211. One end of the button 1213 is connected to the proximal end of the sliding member 1212, and the other end passes through the housing 122 and is exposed outside the housing 122. The limiting member 1211 is fixed within the housing 122, and the sliding member 1212 is movable relative to the limiting member 1211. The doctor can operate the button 1213 exposed outside the housing 122 to move, thereby driving the slider 1212 to move. The slider 1212 moves within the limiting member 1211, which provides protection for the slider 1212 and acts as a guide rail. In this embodiment, the limiting member 1211 can be fixed by providing a reinforcing rib inside the housing 122, with the end face of the limiting member 1211 abutting against the reinforcing rib to restrict the movement of the limiting member 1211, thus fixing the limiting member 1211. Alternatively, protrusions and / or grooves can be provided on the inner wall of the housing 122, and corresponding grooves and / or protrusions can be provided on the outer surface of the limiting member 1211, with the cooperation between the protrusions and grooves restricting the movement of the limiting member 1211 relative to the housing 122. In other specific embodiments of this invention, the limiting member 1211 can also be directly glued inside the housing 122 by adhesive.

[0032] Please see Figures 2 to 4The proximal end of the sheath 13 is fixed within the sliding member 1212, and the sidewall of the limiting member 1211 extends outward to form an extension 1214. The sliding assembly 121 also includes a fixing member 1215, the distal end of which is connected to the proximal end of the extension 1214. A through groove 1216 is provided on the sidewall of the sliding member 1212 corresponding to the position of the extension 1214. After the proximal end of the connecting member 11 passes through the sheath 13, it passes through the through groove 1216 and enters the extension 1214, where it is fixed within the fixing member 1215. When the sliding member 1212 slides, the through groove 1216 slides relative to the connecting member 11. The through groove 1216 prevents the portion of the connecting member 11 extending into the extension 1214 from interfering with the sliding member 1212, thus preventing the sliding member 1212 from abutting against the connecting member 11 and causing the connecting member 11 to break. It should be noted that, to ensure the connection strength between the connector 11 and the fixing member 1215 and to prevent the connector 11 from breaking, a 304 stainless steel sleeve can be pressed onto the proximal end of the connector 11, and then the 304 stainless steel sleeve can be connected to the fixing member 1215 by dispensing adhesive. Meanwhile, to facilitate easier assembly, in this specific embodiment, the extension 1214 and the fixing member 1215 are separately provided, and an adhesive groove penetrating the inner and outer surfaces of the fixing member 1215 is formed. During installation, the proximal end of the connector 11, which contains the 304 stainless steel sleeve, can be first glued to the fixing member 1215 through the adhesive groove. The adhesive groove facilitates the dispensing operation. After ensuring that the connector 11 is securely connected to the fastener 1215, the distal end of the fastener 1215 is connected to the proximal end of the extension 1214, and then adhesive is applied between the fastener 1215 and the extension 1214 to connect the fastener 1215 and the extension 1214.

[0033] For further information, please refer to [link / reference]. Figures 2 to 4Since the connector 11 needs to pass through the sheath 13 from the second cavity 132 into the extension 1214, blood may enter from the second cavity 132 and flow along the trajectory of the connector 11 into the limiting member 1211. To prevent blood from flowing from the second cavity 132 into the limiting member 1211 and then from the limiting member 1211 into the housing 122 and out of the handle assembly 12, a first sealing member 1217 is provided at the distal end of the slider 1212, and a second sealing member 1218 is provided at the proximal end of the slider 1212. The extension 1214 and the through groove 1216 are both located between the first sealing member 1217 and the second sealing member 1218. That is, to ensure that the position where the proximal end of the connector 11 passes through the sheath 13 is located between the first sealing member 1217 and the second sealing member 1218. A sealed space is formed between the first seal 1217 and the second seal 1218, thereby ensuring that blood cannot pass through the first seal 1217 and the second seal 1218, and ensuring that blood will not flow out of the handle assembly 12. In a specific embodiment of this utility model, the first seal 1217 and the second seal 1218 are made of silicone material, so that while the first seal 1217 and the second seal 1218 play a sealing role, they also provide a certain damping feel for the movement of the sliding member 1212 relative to the limiting member 1211, preventing the sliding member 1212 from sliding too easily and prematurely releasing the filter device 2.

[0034] Please see Figure 2 and Figure 3 The handle assembly 12 further includes a protective member 123. The proximal end of the protective member 123 is connected to the distal end of the housing 122, and the distal end of the protective member 123 protrudes outside the distal end of the housing 122. The proximal end of the sheath 13 passes through the protective member 123 and enters the housing 122. The protective member 123 protects the portion of the sheath 13 that contacts the distal end of the housing 122, preventing the sheath 13 from directly contacting the relatively hard housing 122, thereby preventing the sheath 13 from bending and being damaged at the distal end of the housing 122. A suture portion 1231 is provided at the distal end of the protective member 123. The suture portion 1231 has a ring structure and is used to fix the handle assembly 12. For example, during surgery, to prevent the handle assembly 12 from moving or shaking, the suture portion 1231 can be sutured to the patient's skin using medical sutures.

[0035] Please see Figures 3 to 5The handle assembly 12 further includes a hemostatic valve seat 124, which includes a main body 1241, a first end cap 1242, a second end cap 1243, a third sealing element 1244, a fourth sealing element 1245, and a steel pipe 1246. The third sealing element 1244 is disposed at the distal end of the main body 1241. The first end cap 1242 is connected to the distal end of the main body 1241. The fourth sealing element 1245 is disposed at the proximal end of the main body 1241. The second end cap 1243 is connected to the proximal end of the main body 1241. The distal end of the steel pipe 1246 is connected to the proximal end of the sliding element 1212. The proximal end of the steel pipe 1246 passes through the first end cap 1242 and the third sealing element 1244 and is housed within the main body 1241. In a specific embodiment of this utility model, the third sealing element 1244 and the fourth sealing element 1245 are made of silicone material. When the first end cap 1242 is connected to the distal end of the main body 1241, the first end cap 1242 can compress the third seal 1244. The third seal 1244 deforms under compression, thereby locking the proximal end of the steel tube 1246, thus connecting the proximal end of the steel tube 1246 to the main body 1241. The fourth seal 1245 seals the instrument as it passes through the second end cap 1243 into the main body 1241, preventing blood from flowing out of the handle assembly 12 from the second end cap 1243. The steel tube 1246 provides a track for the instrument to pass through the slider 1212.

[0036] Further, please refer to Figure 6The filtering device 2 includes a filter body 21 and a filter 22. The filter 22 is disposed on the filter body 21. The filter body 21 includes a support 211 and a connecting portion 212. The proximal end of the support 211 is connected to the distal end of the connecting portion 212. The connecting portion 212 extends proximally to form a mating portion 2121, which is connected to the connector 11. In a specific embodiment of this utility model, the filter 22 is formed by cutting a nickel-titanium tube skeleton, heat-setting, sandblasting and polishing, and impregnating with TPU solution to form a filter membrane, and then using laser drilling. That is, the filter 22 has a number of small holes with a diameter of 80μm-160μm. The filter body 21 is integrally cut from a nickel-titanium tube. The support 211 is used to support the filter 22 in the blood vessel and expand the filter 22 so that the filter 22 can collect thrombi or calcified fragments. The connecting portion 212 is a tubular structure with a wrinkled surface. The wrinkles on the connecting portion 212 can be formed during integral cutting or by welding onto a smooth tubular structure. The wrinkles in the connecting portion 212 increase the strength of the filter screen 22 attached to the filter screen body 21, preventing the filter screen 22 from detaching from the filter screen body 21. The filter screen 22 has a double-layer structure, meaning one layer of the filter screen 22 is disposed on the outer surface of the filter screen body 21, and another layer of the filter screen 22 is disposed on the inner surface of the filter screen body 21. To ensure the strength of the mating portion 2121 and the connecting member 11, a 304 stainless steel sleeve can be press-fitted between the mating portion 2121 and the connecting member 11, connecting the mating portion 2121 and the connecting member 11 through the 304 stainless steel sleeve, preventing breakage or other problems between the mating portion 2121 and the connecting member 11.

[0037] Please combine Figure 2 and Figure 6 The diameter of the stent 211 gradually increases from the proximal end to the distal end, forming a mesh structure to ensure that the filter device 2 can conform to the blood vessel wall and prevent thrombi and calcified fragments from escaping from the gap between the filter device 2 and the blood vessel wall. The stent 211 includes a support portion 2111 at the distal end and a retrieval portion 2112 at the proximal end. The axial length of the retrieval portion 2112 is greater than the axial length of the support portion 2111, making the retrieval portion 2112 an elongated structure. This reduces the resistance when the filter device 2 is retrieved into the sheath 13, ensuring that the filter device 2 can be smoothly retrieved into the sheath 13. The circumferential length of the support portion 2111 is greater than the axial length of the retrieval portion 2112, making the support portion 2111 an overall rhomboid structure. This ensures the overall support of the stent 211, allowing the filter device 2 to be firmly anchored within the blood vessel wall and preventing the filter device 2 from contracting due to the impact of blood flow.

[0038] Please combine Figure 1 , Figure 2 and Figure 7 The thrombus filtration system 100 further includes a dilator 3. The distal end of the dilator 3 enters from the proximal end of the handle assembly 12, enters the second cavity 132 of the sheath 13, and exits from the distal end of the sheath 13. The dilator 3 facilitates the entry of the sheath 13 and the filter device 2 into the human body, and also provides a certain support force for the sheath 13. Specifically, the dilator 3 includes a tip head 31, a loading section 32, a support section 33, and a dilator seat 34. The proximal end of the tip head 31 is connected to the distal end of the loading section 32. The proximal end of the loading section 32 enters from the distal end of the support section 33 and extends to the proximal end of the support section 33. The proximal end of the support section 33 is connected to the distal end of the dilator seat 34. In a specific embodiment of this utility model, the diameter of the loading section 32 is smaller than the diameter of the support section 33, which can be understood as the support section 33 having a tube body sleeved on the proximal end of the loading section 32. During installation, the expander 3 is inserted into the handle assembly 12 and the sheath 13, with the distal end of the tip head 31 protruding beyond the distal end of the sheath 13. The loading section 32 is located within the filter device 2. When insertion into the human body is required, the tip head 31 facilitates the insertion of the expander 3, thereby allowing the sheath 13 and filter device 2 to enter the body more easily. The filter device 2 is mounted on the loading section 32. Due to the small diameter of the loading section 32, there is no interference between the loading section 32 and the filter device 2, avoiding excessive friction between the filter device 2 and the expander 3 support 211, which could prevent the expander 3 from passing through the filter device 2.

[0039] Compared with existing technologies, the thrombus filtration system of this invention has the following advantages: During surgery, the thrombus filtration system can intercept and capture detached thrombi or calcified fragments, preventing these fragments from being carried by the bloodstream to the distal end and causing vascular embolism. This avoids the risk of local pain, tissue necrosis, hemiplegia, dementia, or even death in patients.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thrombus filtration system, characterized in that: The thrombus filtration system includes a delivery device and a filtering device. The delivery device includes a connector, a handle assembly, and a sheath. The handle assembly includes a sliding assembly. The proximal end of the sheath is connected to the sliding assembly. The proximal end of the connector passes through the proximal end of the sheath and is fixed inside the handle assembly. The distal end of the connector is connected to the filtering device. The filtering device can be housed inside the distal end of the sheath. The sliding assembly can drive the sheath to move relative to the connector and the filtering device.

2. The thrombus filtration system as described in claim 1, characterized in that: The sheath includes a sheath body and a receiving portion. The proximal end of the receiving portion is connected to the distal end of the sheath body, and the proximal end of the sheath body is connected to the sliding assembly. The filtering device can be housed in the receiving portion.

3. The thrombus filtration system as described in claim 1, characterized in that: The handle assembly further includes a housing, and the sliding assembly includes a limiting member, a sliding member, and a button. The limiting member is sleeved on the sliding member, and the proximal end of the sliding member is exposed outside the proximal end of the limiting member. One end of the button is connected to the proximal end of the sliding member, and the other end passes through the housing and is exposed outside the housing. The limiting member is fixed inside the housing, and the sliding member can move relative to the limiting member under the action of the button.

4. The thrombus filtration system as described in claim 3, characterized in that: The proximal end of the sheath is fixed inside the sliding member. Part of the sidewall of the limiting member extends outward to form a hollow extension. The sliding assembly also includes a fixing member. The distal end of the fixing member is connected to the proximal end of the extension, and the fixing member communicates with the extension. A through groove is provided on the sidewall of the sliding member corresponding to the position of the extension. After the proximal end of the connector passes through the sheath, it passes through the through groove into the extension and is fixed inside the fixing member.

5. The thrombus filtration system as described in claim 4, characterized in that: The sliding member has a first sealing element at its distal end and a second sealing element at its proximal end. The extension and the through groove are both disposed between the first sealing element and the second sealing element.

6. The thrombus filtration system as described in claim 3, characterized in that: The handle assembly also includes a protective member, the proximal end of which is connected to the distal end of the housing, and the distal end of the protective member is provided with a stitched portion.

7. The thrombus filtration system as described in claim 3, characterized in that: The handle assembly also includes a hemostatic valve seat, which includes a main body, a first end cap, a second end cap, a third seal, a fourth seal, and a steel pipe. The third seal is disposed at the distal end of the main body, the first end cap is connected to the distal end of the main body, the fourth seal is disposed at the proximal end of the main body, the second end cap is connected to the proximal end of the main body, and the distal end of the steel pipe is connected to the proximal end of the sliding member. The proximal end of the steel pipe passes through the first end cap and the third seal and is housed within the main body.

8. The thrombus filtration system as described in claim 1, characterized in that: The filtration device includes a filter body, which includes a support and a connecting portion connected to the proximal end of the support. The connecting portion extends proximal to form a mating portion, which is connected to the connector.

9. The thrombus filtration system as described in claim 8, characterized in that: In its natural state, the diameter of the support gradually increases from the proximal end to the distal end. The support includes a support portion disposed at the distal end and a retraction portion disposed at the proximal end. The length of the retraction portion in the axial direction is greater than the length of the support portion in the axial direction, and the length of the support portion in the circumferential direction is greater than the length of the retraction portion in the axial direction.

10. The thrombus filtration system as described in claim 2, characterized in that: The sheath includes a first cavity and a second cavity arranged along the axial direction of the sheath. The first cavity and the second cavity are located on the proximal side of the storage part, and the volume of the second cavity is larger than the volume of the first cavity. The proximal end of the connector passes through the storage part and the second cavity and is fixed in the handle assembly.

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