Thrombus filtering device and blood filtering circulating system

The thrombus filtration device, with its multi-layered filtration structure and detachable design, solves the problems of large thrombi clogging and small thrombi mixing, improving filtration efficiency and device reusability, and simplifying surgical procedures.

CN223696465UActive Publication Date: 2025-12-23SUZHOU ZENITH VASCULAR SCITECH LTD
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Patent Information

Application Number
CN202422584312.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-25
Publication Date
2025-12-23
Estimated Expiration
2034-10-25

AI Technical Summary

Technical Problem

Existing thrombus filtration devices are prone to clogging the filter membrane when filtering large thrombi, resulting in reduced filtration efficiency. At the same time, small thrombi can easily mix into the filtered blood, reducing the filtration effect.

Method used

It adopts a multi-layer filtration structure, including a filter screen, a first filter membrane, and a second filter membrane. The mesh size gradually decreases to filter large and small thrombi, respectively. The filter frame is designed for easy disassembly with snap-fit ​​components, making it reusable.

Benefits of technology

It improves blood filtration efficiency, avoids large blood clots from clogging and small blood clots from mixing in, simplifies the cleaning process, and improves surgical efficiency and the reusability of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of medical instruments, and particularly discloses a thrombus filtering device and a blood filtering circulating system. The blood inlet formed in the blood bottle is used for allowing blood to enter, the extraction opening is used for being connected with the negative pressure pump, the negative pressure pump works to enable the blood to enter the blood bottle through the blood inlet, and the blood entering the blood bottle needs to be sequentially filtered through the filter screen, the first filter membrane and the second filter membrane and then is discharged through the blood extraction opening. Meshes of the filter screen are larger than those of the first filter membrane, the filter screen can filter large thrombus in blood, the large thrombus is prevented from blocking the first filter membrane and the second filter membrane, and the blood filtering efficiency is improved; the first filtering membrane and the second filtering membrane can filter small thrombus in the blood, the small thrombus is prevented from being mixed into the filtered blood, and the thrombus filtering effect is improved; in addition, the filtering assembly is detachably connected with the blood bottle, the filtering assembly can be taken out for cleaning, and repeated utilization of the thrombus filtering device is achieved.
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Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a thrombus filtration device and a blood filtration and circulation system. Background Technology

[0002] A thrombus is a small mass that forms on the surface of blood vessels in the cardiovascular system at sites of rupture or repair. In variable fluid-dependent thrombi, a thrombus consists of insoluble fibrin, deposited platelets, accumulated white blood cells, and trapped red blood cells. If a thrombus is present in the blood, it needs to be removed. In existing technologies, the suction port of a thrombus filtration device is connected to a negative pressure pump, and the device is connected to the body via a thrombus aspiration catheter. Using the suction capacity of the negative pressure pump, blood clots are drawn from the body through the catheter into the thrombus filtration device for filtration. Currently, the filtration methods and post-filtration blood processing methods vary among thrombus filtration devices.

[0003] A common practice is that thrombus filtration devices typically only use a filter membrane for filtration, without pre-filtering large thrombi. This can cause large thrombi to clog the membrane pores, significantly reducing filtration efficiency. Additionally, some thrombus filtration devices use only a single filter membrane, allowing smaller thrombi to easily mix into the filtered blood, further reducing the effectiveness of thrombus filtration. Utility Model Content

[0004] The purpose of this invention is to provide a thrombus filtration device and a blood filtration circulation system, which solves the problem of large thrombi clogging the pores of the filter membrane and prevents small thrombi from mixing into the filtered blood, thereby improving the filtration effect on thrombi.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a thrombus filtration device is provided, comprising:

[0007] A blood bottle, the blood bottle having a blood inlet, an air extraction port and a blood extraction port, the blood inlet being used to allow blood to enter, the air extraction port being used to connect to a negative pressure pump, and the blood extraction port being used to allow blood to exit.

[0008] A filter assembly is detachably disposed inside the blood bottle. The filter assembly includes a filter screen, a first filter membrane, and a second filter membrane. The filter screen, the first filter membrane, and the second filter membrane are used to allow blood entering through the blood inlet to flow through sequentially and to be discharged through the blood draw port. The mesh size of the filter screen is larger than that of the first filter membrane, and the mesh size of the first filter membrane is larger than that of the second filter membrane.

[0009] As an optional technical solution for the aforementioned thrombus filtration device, the filtration assembly further includes a first filter frame, a second filter frame, and a third filter frame. The first filter frame is provided with the filter screen, the second filter frame is provided with a first filter membrane, and the third filter frame is provided with a second filter membrane. The second filter frame is detachably connected to the first filter frame, and the third filter frame is detachably connected to the second filter frame.

[0010] As an optional technical solution of the above-mentioned thrombus filtration device, the first end of the first filter frame is inserted into the first end of the second filter frame, the second end of the second filter frame is inserted into the first end of the third filter frame, the filter screen is disposed at the first end of the first filter frame, the first filter membrane is disposed at the second end of the second filter frame, the second filter membrane is disposed at the second end of the third filter frame, the first filter membrane and the filter screen are spaced apart, and the second filter membrane and the first filter membrane are spaced apart.

[0011] As an optional technical solution for the aforementioned thrombus filtration device, a first snap-fit ​​member is provided on the outer side of the first filter frame, and a second snap-fit ​​member is provided on the inner side of the second filter frame, wherein the first snap-fit ​​member and the second snap-fit ​​member snap-fit ​​together.

[0012] The second filter frame has a third snap-fit ​​component on its outer side and a fourth snap-fit ​​component on its inner side, and the fourth snap-fit ​​component snaps into the third snap-fit ​​component.

[0013] As an optional technical solution for the aforementioned thrombus filtration device, the first and third snap-fit ​​components each include one of a snap block and a snap slot, and the second and fourth snap-fit ​​components each include the other of a snap block and a snap slot. The snap slot and the snap block extend axially around the first filter frame, and the snap block can snap into or disengage from the snap slot.

[0014] As an alternative technical solution for the aforementioned thrombus filtration device, the second end of the third filter frame has a conical structure, and the second filter membrane is arranged around the side wall of the third filter frame.

[0015] As an optional technical solution for the aforementioned thrombus filtration device, the blood bottle includes a bottle body and a bottle cap, the bottle cap being detachably connected to the bottle body, the filter assembly being disposed within the bottle body, the filter assembly separating the bottle body to form a first cavity and a second cavity, the blood inlet and the air extraction port both communicating with the first cavity, and the blood extraction port communicating with the second cavity.

[0016] As an optional technical solution for the aforementioned thrombus filtration device, the bottle body is provided with a first overlapping protrusion along the circumferential direction, and the filtration component is provided with a second overlapping protrusion along the circumferential direction, the second overlapping protrusion overlapping the first overlapping protrusion.

[0017] As an optional technical solution for the aforementioned thrombus filtration device, the bottle body is provided with a partition plate, the partition plate is located below the first overlapping protrusion, one end of the filter assembly passes through the partition plate, and the partition plate supports the filter assembly upward.

[0018] In a second aspect, a blood filtration and circulation system is provided, comprising a thrombus aspiration catheter, a negative pressure pump, and a thrombus filtration device as described above, wherein the thrombus aspiration catheter is connected to a blood inlet, and the negative pressure pump is connected to an air extraction port.

[0019] The beneficial effects of this utility model are:

[0020] The thrombus filtration device provided by this utility model has a blood inlet on the blood bottle for blood to enter, and an air extraction port for connecting to a negative pressure pump. The negative pressure pump allows blood to enter the blood bottle through the blood inlet. The blood in the blood bottle is filtered sequentially through a filter screen, a first filter membrane, and a second filter membrane before being discharged through the air extraction port. The mesh size of the filter screen is larger than that of the first filter membrane. The filter screen can filter out large thrombi in the blood, preventing large thrombi from clogging the first and second filter membranes and improving the efficiency of blood filtration. The first and second filter membranes can filter out small thrombi in the blood, preventing small thrombi from mixing into the filtered blood and improving the filtration effect on thrombi. In addition, the filter component is detachably connected to the blood bottle. The filter component can be removed, the thrombi on the filter component can be emptied, and the filter component can be put back into the blood bottle for continued use, realizing the reuse of the thrombus filtration device and improving the efficiency of blood filtration. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the thrombus filtration device provided in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the thrombus filtration device provided in this embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the filter assembly provided in this embodiment of the utility model;

[0024] Figure 4 This is a cross-sectional view of the filtering component provided in an embodiment of the present utility model;

[0025] Figure 5 This is a first-view structural schematic diagram of the first filter frame provided in an embodiment of the present utility model;

[0026] Figure 6 This is a second-view structural schematic diagram of the first filter frame provided in an embodiment of the present invention;

[0027] Figure 7 This is a first-view structural schematic diagram of the second filter frame provided in an embodiment of the present invention;

[0028] Figure 8 This is a structural schematic diagram of the second filter frame provided in an embodiment of the present invention from a second perspective;

[0029] Figure 9 This is a first-view structural schematic diagram of the third filter frame provided in this embodiment of the present invention;

[0030] Figure 10 This is a structural schematic diagram of the third filter frame provided in an embodiment of the present invention from a second perspective.

[0031] In the picture:

[0032] 1. Blood bottle; 2. Filter assembly;

[0033] 11. Blood inlet; 12. Air suction port; 13. Blood suction port; 14. Bottle body; 141. First cavity; 142. Second cavity; 143. First overlapping protrusion; 144. First bottle body; 145. Second bottle body; 15. Bottle cap; 16. Divider plate;

[0034] 21. Filter screen; 22. First filter membrane; 23. Second filter membrane; 24. First filter frame; 241. First snap-fit ​​connector; 25. Second filter frame; 251. Second snap-fit ​​connector; 252. Third snap-fit ​​connector; 26. Third filter frame; 261. Fourth snap-fit ​​connector; 27. Second overlapping boss. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] This embodiment provides a blood filtration and circulation system, which includes a thrombus aspiration catheter, a negative pressure pump, and a thrombus filtration device. The thrombus aspiration catheter is connected to a blood inlet, and the negative pressure pump is connected to an air outlet. When the thrombus aspiration catheter is inserted into the body, a negative pressure environment is created within the thrombus filtration device when the negative pressure pump is operating. Blood from the body enters the thrombus filtration device through the thrombus aspiration catheter. After being filtered by the thrombus filtration device, the blood is discharged through the blood aspiration port, which is connected to a blood return tube inserted into the body. The blood filtered by the thrombus filtration device flows back into the body through the blood return tube, reducing the patient's need for allogeneic blood transfusions and thus lowering the risk of transfusion-related infections and immune responses. The blood filtration and circulation system provided in this embodiment replaces the manual method of repeatedly removing thrombi, filtering, and reinfusing blood using syringes, simplifying the surgical procedure and improving surgical efficiency.

[0040] The thrombus aspiration catheter can be attached to the blood inlet, and the negative pressure pump is connected to the air outlet through a Luer head.

[0041] like Figure 1 and Figure 2As shown, the thrombus filtration device includes a blood bottle 1 and a filter assembly 2. The blood bottle 1 has a blood inlet 11, an air extraction port 12, and a blood extraction port 13. The blood inlet 11 is used to allow blood to enter, the air extraction port 12 is used to connect to a negative pressure pump, and the blood extraction port 13 is used to allow blood to exit. The filter assembly 2 is detachably installed inside the blood bottle 1. The filter assembly 2 includes a filter screen 21, a first filter membrane 22, and a second filter membrane 23. The filter screen 21, the first filter membrane 22, and the second filter membrane 23 allow blood entering through the blood inlet 11 to flow through sequentially and exit through the blood extraction port 13. The mesh size of the filter screen 21 is larger than that of the first filter membrane 22, and the mesh size of the first filter membrane 22 is larger than that of the second filter membrane 23.

[0042] The thrombus filtration device provided in this embodiment has a blood inlet 11 on the blood bottle 1 for blood to enter, and an air extraction port 12 for connecting to a negative pressure pump. The negative pressure pump allows blood to enter the blood bottle 1 through the blood inlet 11. The blood entering the blood bottle 1 needs to be filtered sequentially through a filter screen 21, a first filter membrane 22, and a second filter membrane 23, and then discharged through the blood extraction port 13. The mesh size of the filter screen 21 is larger than that of the first filter membrane 22. The filter screen 21 can filter large thrombi in the blood, preventing large thrombi from clogging the first filter membrane 22 and the second filter membrane 23, thus improving the efficiency of blood filtration. The first filter membrane 22 and the second filter membrane 23 can filter small thrombi in the blood, preventing small thrombi from mixing into the filtered blood, thus improving the thrombus filtration effect. In addition, the filter assembly 2 is detachably connected to the blood bottle 1. The filter assembly 2 can be removed, the thrombi on the filter assembly 2 can be poured out, and then put back into the blood bottle 1 for continued use, realizing the reuse of the thrombus filtration device and improving the efficiency of blood filtration.

[0043] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the filter assembly 2 also includes a first filter frame 24, a second filter frame 25, and a third filter frame 26. The first filter frame 24 has a filter screen 21, the second filter frame 25 has a first filter membrane 22, and the third filter frame 26 has a second filter membrane 23. The second filter frame 25 and the third filter frame 26 are detachably connected to each other. The first filter frame 24 is used to install the filter screen 21, the second filter frame 25 is used to install the first filter membrane 22, and the third filter frame 26 is used to install the second filter membrane 23. The detachable connection between the first filter frame 24 and the second filter frame 25, and the second filter frame 25 and the third filter frame 26, facilitates cleaning of the filter screen 21 or the filter membrane, enabling the filter assembly 2 to be reused, and improving the filtration efficiency of the filter assembly 2, thereby improving the efficiency of the surgery.

[0044] Optionally, the first end 242 of the first filter frame 24 is inserted into the first end 253 of the second filter frame 25, the second end 254 of the second filter frame 25 is inserted into the first end 262 of the third filter frame 26, the filter screen 21 is disposed at the first end 242 of the first filter frame 24, the first filter membrane 22 is disposed at the second end 254 of the second filter frame 25, and the second filter membrane 23 is disposed at the second end 263 of the third filter frame 26. The first filter membrane 22 and the filter screen 21 are spaced apart, and the second filter membrane 23 and the first filter membrane 22 are spaced apart, providing space for the flow of blood in the filter assembly 2 and improving the efficiency of blood filtration.

[0045] like Figures 5 to 7 As shown, the outer side of the first filter holder 24 is provided with a first snap-fit ​​member 241, and the inner side of the second filter holder 25 is provided with a second snap-fit ​​member 251. The first snap-fit ​​member 241 and the second snap-fit ​​member 251 are snapped together. Figures 8 to 10 As shown, the outer side of the second filter frame 25 is provided with a third snap-fit ​​member 252, and the inner side of the third filter frame 26 is provided with a fourth snap-fit ​​member 261. The fourth snap-fit ​​member 261 is snapped into the third snap-fit ​​member 252. The first filter frame 24 and the second filter frame 25, as well as the second filter frame 25 and the third filter frame 26, are respectively snapped into each other by snap-fit ​​members, which facilitates installation and disassembly, and makes it easy to clean the filter screen 21 or the filter membrane.

[0046] Optionally, the first snap-fit ​​member 241 and the third snap-fit ​​member 252 each include one of a snap-fit ​​block and a snap-fit ​​groove, and the second snap-fit ​​member 251 and the fourth snap-fit ​​member 261 each include the other of a snap-fit ​​block and a snap-fit ​​groove. The snap-fit ​​groove and the snap-fit ​​block extend axially around the first filter frame 24, and the snap-fit ​​block can engage with or disengage from the snap-fit ​​groove. When installing or removing the first filter frame 24 from the second filter frame 25, or installing or removing the second filter frame 25 from the third filter frame 26, simply rotating the first filter frame 24 or the second filter frame 25 can achieve disassembly or installation, making the operation simple and convenient. In other embodiments, the first snap-fit ​​member 241 and the third snap-fit ​​member 252, as well as the second snap-fit ​​member 251 and the fourth snap-fit ​​member 261, are other snap-fit ​​structures that facilitate disassembly and installation, and are not specifically limited here.

[0047] The filter screen 21 can be fixed to the first filter frame 24 by welding, the first filter membrane 22 can be fixed to the second filter frame 25 by integral injection molding or welding, and the second filter membrane 23 can be fixed to the third filter frame 26 by integral injection molding or welding.

[0048] Continue to refer to Figure 4As shown, the mesh size of filter screen 21 is larger than that of the first filter membrane 22. The mesh size of filter screen 21 is 1.5mm-2mm, optionally 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm. The mesh size of the first filter membrane 22 is 180μm-220μm, optionally 180μm, 190μm, 200μm, 210μm, or 220μm. The mesh size of the second filter membrane 23 is 30μm-60μm, optionally 30μm, 40μm, 50μm, or 60μm. Filter screen 21 can pre-filter large blood clots in the blood, thereby preventing large blood clots from clogging the first filter membrane 22 and the second filter membrane 23, and improving the filtration efficiency of blood clots. The first filter membrane 22 and the second filter membrane 23 can filter out tiny blood clots in the blood, improving the blood clot filtration effect. When a blood clot clogs the filter screen 21, the first filter membrane 22, or the second filter membrane 23, causing the blood filtration efficiency to be too low, the first filter frame 24, the second filter frame 25, and the third filter frame 26 can be removed, the three filter frames can be disassembled, the filtered blood clots can be discarded, and then the three filter frames can be reassembled and placed in the blood bottle 1 for continued use.

[0049] In some embodiments, the second end 263 of the third filter frame 26 has a tapered structure, and the second filter membrane 23 is disposed around the side wall of the third filter frame 26, thereby increasing the area of ​​the second filter membrane 23 and thus increasing the filtration efficiency.

[0050] In some embodiments, refer to Figure 2 , Figure 3 and Figure 4 As shown, the blood bottle 1 includes a bottle body 14 and a bottle cap 15. The bottle cap 15 is detachably connected to the bottle body 14. A filter assembly 2 is disposed inside the bottle body 14, dividing the bottle body 14 to form a first cavity 141 and a second cavity 142. The blood inlet 11 and the air outlet 12 are both connected to the first cavity 141 to ensure that the blood can flow sequentially through the filter screen 21, the first filter membrane 22, and the second filter membrane 23 for filtration. The blood outlet 13 is connected to the second cavity 142. The filtered blood flows into the second cavity 142 and is discharged through the blood outlet 13 under the action of its own gravity. Opening the bottle cap 15 allows the filter assembly 2 to be removed or placed inside the bottle body 14. The bottle cap 15 and the bottle body 14 can be screwed or snapped together, which is not specifically limited here.

[0051] Optionally, the bottle body 14 has a first overlapping protrusion 143 circumferentially inside, and the filter assembly 2 has a second overlapping protrusion 27 circumferentially. Specifically, the second filter frame 25 has a second overlapping protrusion 27 circumferentially, and the second overlapping protrusion 27 overlaps with the first overlapping protrusion 143. The first overlapping protrusion 143 and the second overlapping protrusion 27 cooperate to fix the filter assembly 2, and facilitate the overall removal or placement of the filter assembly 2 inside the bottle body 14.

[0052] Optionally, a partition plate 16 is provided inside the bottle body 14. The partition plate 16 is positioned below the first overlapping protrusion 143. One end of the filter assembly 2 passes through the partition plate 16, and the partition plate 16 supports the filter assembly 2 upwards, improving the stability of the filter assembly 2 within the bottle body 14. Specifically, the second end 263 of the third filter frame 26 of the filter assembly 2 has a tapered structure. The partition plate 16 has a through hole, and the second end 263 of the third filter frame 26 passes through the through hole. When the outer diameter of the third filter frame 26 matches the diameter of the through hole, the third filter frame 26 no longer moves downwards, thereby fixing the position of the filter assembly 2.

[0053] In some embodiments, the bottle body 14 includes a first bottle body 144 and a second bottle body 145. The first end 1441 of the first bottle body 144 is flared, and the first end 1441 is detachably connected to the second bottle body 145. A first overlapping protrusion 143 is circumferentially located on the inner wall of the first bottle body 144, and a partition plate 16 is disposed within the second bottle body 145. When installing the filter assembly 2, it can be first installed within the first bottle body 144, with the second overlapping protrusion 27 overlapping the first overlapping protrusion 143, and then the first bottle body 144 is installed onto the second bottle body 145. When disassembling the filter assembly 2, the first bottle body 144 can be disassembled, and the filter assembly 2 separates from the second bottle body 145 along with the first bottle body 144. The filter assembly 2 can then be removed. Furthermore, after disassembling the first bottle body 144, the third filter holder 26 can also be directly disassembled.

[0054] The first end 1441 of the first bottle body 144 is provided with one of a insertion groove and an insertion block along the circumferential direction, and the end face of the second bottle body 145 is provided with the other of a insertion groove and an insertion block. The insertion block is inserted into the insertion groove to facilitate the installation and removal of the first bottle body 144.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A thrombus filtration device, characterized in that, include: Blood bottle (1), the blood bottle (1) has a blood inlet (11), an air extraction port (12) and a blood extraction port (13), the blood inlet (11) is used to allow blood to enter, the air extraction port (12) is used to connect to a negative pressure pump, and the blood extraction port (13) is used to allow blood to exit. A filter assembly (2) is detachably disposed inside the blood bottle (1). The filter assembly (2) includes a filter screen (21), a first filter membrane (22), and a second filter membrane (23). The filter screen (21), the first filter membrane (22), and the second filter membrane (23) are used to allow blood entering through the blood inlet (11) to flow through in sequence and to be discharged through the blood draw port (13). The mesh size of the filter screen (21) is larger than that of the first filter membrane (22), and the mesh size of the first filter membrane (22) is larger than that of the second filter membrane (23).

2. The thrombus filtering device according to claim 1, characterized in that, The filter assembly (2) further includes a first filter frame (24), a second filter frame (25) and a third filter frame (26). The first filter frame (24) is provided with the filter screen (21), the second filter frame (25) is provided with a first filter membrane (22), and the third filter frame (26) is provided with a second filter membrane (23). The second filter frame (25) is detachably connected to the first filter frame (24), and the third filter frame (26) is detachably connected to the second filter frame (25).

3. The thrombus filtering device according to claim 2, characterized in that, The first end (242) of the first filter frame (24) is inserted into the first end (253) of the second filter frame (25), the second end (254) of the second filter frame (25) is inserted into the first end (262) of the third filter frame (26), the filter screen (21) is disposed at the first end (242) of the first filter frame (24), the first filter membrane (22) is disposed at the second end (254) of the second filter frame (25), the second filter membrane (23) is disposed at the second end (263) of the third filter frame (26), the first filter membrane (22) and the filter screen (21) are spaced apart, and the second filter membrane (23) and the first filter membrane (22) are spaced apart.

4. The thrombus filtering device according to claim 3, characterized in that, The first filter frame (24) is provided with a first snap-fit ​​member (241) on the outside, and the second filter frame (25) is provided with a second snap-fit ​​member (251) on the inside, and the first snap-fit ​​member (241) and the second snap-fit ​​member (251) snap-fit ​​together; The second filter frame (25) has a third snap-fit ​​member (252) on its outer side and a fourth snap-fit ​​member (261) on its inner side. The fourth snap-fit ​​member (261) snaps into the third snap-fit ​​member (252).

5. The thrombus filtering device according to claim 4, characterized in that, The first snap-fit ​​member (241) and the third snap-fit ​​member (252) each include one of a snap-fit ​​block and a snap-fit ​​slot, and the second snap-fit ​​member (251) and the fourth snap-fit ​​member (261) each include the other of the snap-fit ​​block and the snap-fit ​​slot. The snap-fit ​​slot and the snap-fit ​​block extend axially around the first filter frame (24), and the snap-fit ​​block can snap into the snap-fit ​​slot or disengage from the snap-fit ​​slot.

6. The thrombus filtering device according to claim 3, characterized in that, The second end (263) of the third filter frame (26) has a conical structure, and the second filter membrane (23) is arranged around the side wall of the third filter frame (26).

7. The thrombus filtering device according to any one of claims 1-6, characterized in that, The blood bottle (1) includes a bottle body (14) and a bottle cap (15). The bottle cap (15) is detachably connected to the bottle body (14). The filter assembly (2) is disposed inside the bottle body (14). The filter assembly (2) separates the bottle body (14) to form a first cavity (141) and a second cavity (142). The blood inlet (11) and the air extraction port (12) are both connected to the first cavity (141). The blood extraction port (13) is connected to the second cavity (142).

8. The thrombus filtering device according to claim 7, characterized in that, The bottle body (14) is provided with a first overlapping boss (143) along the circumferential direction, and the filter assembly (2) is provided with a second overlapping boss (27) along the circumferential direction. The second overlapping boss (27) overlaps on the first overlapping boss (143).

9. The thrombus filtering device according to claim 8, characterized in that, The bottle body (14) is provided with a partition plate (16), which is located below the first overlapping boss (143). One end of the filter assembly (2) passes through the partition plate (16), and the partition plate (16) supports the filter assembly (2) upward.

10. A blood filtration and circulation system, characterized in that, The device includes a thrombus aspiration catheter, a negative pressure pump, and a thrombus filtration device according to any one of claims 1-9, wherein the thrombus aspiration catheter is connected to the blood inlet (11), and the negative pressure pump is connected to the air extraction port (12).