Blood filtering and circulating device

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a blood filtering and circulating device. According to the blood filtering and circulating device, when the switching valve enables the suction opening to be communicated with the negative pressure suction device, the negative pressure suction device works, negative pressure is generated in the thrombus filter, blood in a human body enters the thrombus filter through the thrombus suction catheter, the thrombus filter filters thrombus in the blood, after the thrombus is extracted, the negative pressure suction device stops working, and the thrombus in the human body enters the thrombus filter through the thrombus suction catheter. The switching valve enables the blood drawing port to be communicated with the blood transfusion pipeline, blood in the thrombus filter flows back to the human body through the blood transfusion pipeline, and the blood loss amount of the human body is easy to control in the operation process. Besides, the filtered blood can flow back to the human body, so that the requirement of a patient on allogenic blood transfusion is reduced, and further the infection risk and immune response related to blood transfusion are reduced; according to the blood filtering and circulating device, the mode that an injector is used for manually taking thrombus for multiple times, filtering and transfusing blood back is replaced, and the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially, relate to a blood filtration circulating device. BACKGROUND

[0002] Venous thromboembolism (VTE) includes deep vein thrombosis (DVT) and pulmonary embolism (PE). Current main means of treating VTE include thrombolytic therapy, vascular surgery, thrombus aspiration therapy, etc. Drug therapy such as anticoagulants and thrombolytic drugs can effectively prevent and treat VTE, but for large thrombus that has formed, the drug effect is limited, and there is a risk of bleeding. Surgical operation can directly remove thrombus, but the operation is traumatic, the recovery time is long, and it is suitable for a small number of specific patients. Thrombus aspiration surgery is a minimally invasive surgery, which enters the blood vessel system through a catheter and aspirates thrombus out of the body. This method is usually performed under image guidance and has the advantages of accurate positioning, small trauma and rapid recovery. This surgery is suitable for acute VTE patients, especially those who are ineffective or cannot tolerate drug therapy. Although using large-diameter catheters and high-efficiency negative pressure devices can effectively aspirate large thrombus, and is suitable for thrombus aspiration in peripheral arteries and veins, but during the operation, healthy blood is often aspirated out of the body at the same time as the thrombus is aspirated, resulting in increased blood loss of the patient during the operation and affecting the volume balance.

[0003] To solve the problem of difficult control of intraoperative blood loss during aspiration surgery, there are two types of products currently solving this clinical problem, and the representative products are: 1) intelligent aspiration catheter system, which increases a pressure flow sensor in the middle of the aspiration catheter to monitor the pressure and flow of the liquid in the aspiration catheter in real time, and judges the medium property in the catheter at this moment, thrombus or blood, such as blood, which is fed back to the negative pressure pump to reduce the aspiration negative pressure, and the high negative pressure aspiration state is maintained when it is thrombus. 2) Blood recovery system, which filters and recovers the blood after aspiration and then returns it to the body. This blood recovery system is used in conjunction with a syringe and a flowtriever system. The syringe aspirates thrombus, and the operation is complicated and time-consuming.

[0004] Although the intelligent aspiration catheter is suitable for large thrombus, it may need to be aspirated multiple times to completely remove it, and therefore still causes the problem of difficult control of intraoperative blood loss. In addition, the intelligent aspiration catheter system is complex and has a high use cost, which increases medical expenses and is not conducive to the technical popularization of the product. Although the blood recovery system uses the patient's own blood, it reduces the demand for allogeneic blood transfusion, thereby reducing the risk of infection and immune response related to blood transfusion, and reducing the operation difficulty of peripheral or pulmonary arterial thrombus aspiration. However, the manual thrombus removal, filtration and return of the syringe make the operation process complicated and reduce the operation efficiency. SUMMARY

[0005] The utility model discloses a blood filtration circulation device, solved the problem of the large amount of blood loss in operation, and the blood is back to the body while taking out the filter thrombus, simplified the process of operation, improved the efficiency of operation.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] Blood filtration circulation device, including:

[0008] Negative pressure aspirator, first catheter is connected to the negative pressure aspirator;

[0009] Thrombus filter for filtering thrombus, the thrombus filter has blood inlet, blood extraction port and suction port, the suction port is connected with second catheter, and the blood extraction port is connected with third catheter;

[0010] Suction catheter, the proximal end of the suction catheter is connected with the blood inlet, and the distal end of the suction catheter is used for inserting into the human body;

[0011] Switching valve, the first interface of the switching valve is connected with the first catheter, the second interface of the switching valve is connected with the second catheter, and the third interface of the switching valve is connected with the third catheter;

[0012] Blood return line, the proximal end of the blood return line is connected with the fourth interface of the switching valve, and the distal end of the blood return line is used for inserting into the human body, the switching valve is used to make the suction port communicate with the negative pressure aspirator, and make the blood extraction port not communicate with the blood return line, or make the blood extraction port communicate with the blood return line, and make the suction port not communicate with the negative pressure aspirator.

[0013] As an optional technical scheme of the above-mentioned blood filtration circulation device, a stop valve is arranged on the suction catheter, and the stop valve is used to cut off or conduct the suction catheter.

[0014] As an optional technical scheme of the above-mentioned blood filtration circulation device, an anticoagulant infusion pipe is arranged on the stop valve, the stop valve conducts the suction catheter, and simultaneously communicates the anticoagulant infusion pipe and the suction catheter, the stop valve cuts off the suction catheter, and simultaneously cuts off the anticoagulant infusion pipe and the suction catheter.

[0015] As an optional technical scheme of the above-mentioned blood filtration circulation device, the blood extraction port is arranged below the blood inlet and the suction port.

[0016] As an optional technical scheme of the above-mentioned blood filtration circulation device, the blood inlet and the suction port are arranged symmetrically relative to the axis of the thrombus filter.

[0017] As an optional technical scheme of the blood filtering circulation device, the blood thrombus filter comprises a blood bottle, a filtering assembly is detachably arranged in the blood bottle, the blood inlet, the suction port and the blood outlet are arranged on the blood bottle, and the filtering assembly is used for filtering blood entering through the blood inlet.

[0018] As an optional technical scheme of the blood filtering circulation device, the filtering assembly comprises a first filtering piece and a second filtering piece, the filtering hole diameter of the first filtering piece is larger than that of the second filtering piece, the second filtering piece is detachably arranged in the blood bottle, the second filtering piece divides the blood bottle to form a first cavity and a second cavity, the first filtering piece is arranged in the first cavity and above the second filtering piece, the first filtering piece is detachably connected with the blood bottle, the blood inlet and the suction port are communicated with the first cavity, and the blood outlet is communicated with the second cavity.

[0019] As an optional technical scheme of the blood filtering circulation device, the first filtering piece comprises a first filtering frame and a filtering screen, the first end of the first filtering frame is detachably connected with the blood bottle, and the filtering screen is arranged at the second end of the first filtering frame.

[0020] The second filtering piece comprises a second filtering frame and a filtering membrane, the first end of the second filtering frame is detachably connected with the blood bottle, the second filtering frame divides the blood bottle to form the first cavity and the second cavity, the second end of the second filtering frame is arranged in the second cavity, the filtering membrane is arranged at the second end of the second filtering frame, and the second end of the first filtering frame is inserted into the first end of the second filtering frame.

[0021] As an optional technical scheme of the blood filtering circulation device, the inner side wall of the blood bottle is provided with a first boss in the circumferential direction, the outer side wall of the first filtering piece is provided with a second boss in the circumferential direction, and the second boss is lapped on the first boss.

[0022] As an optional technical scheme of the blood filtering circulation device, the blood bottle comprises a tank body and a connecting barrel, the first end of the connecting barrel is in the shape of a flared mouth, the first end of the connecting barrel is detachably connected with the tank body, the inner side wall of the first end of the connecting barrel is elastically provided with a connecting plate in the circumferential direction, the inner side of the connecting plate is provided with one of a clamping block and a clamping groove, the outer side wall of the second filtering piece is provided with the other of the clamping block and the clamping groove in the circumferential direction, and the clamping block is clamped in the clamping groove.

[0023] The blood filtering circulation device has the advantages that:

[0024] The blood filtering and circulating device provided by the utility model, when the switching valve makes the suction port and the negative pressure aspirator communicate, the negative pressure aspirator works, negative pressure is generated in the thrombus filter, the blood in the human body enters the thrombus filter through the thrombus suction conduit, the thrombus filter filters the thrombus in the blood, after the thrombus is extracted, the negative pressure aspirator stops working, the switching valve makes the blood extraction port communicate with the blood return pipeline, the blood in the thrombus filter flows back to the human body through the blood return pipeline, during the operation process, the blood loss of the human body is easy to control, the structure is simple, easy to operate, the medical cost is low, and the blood filtering and circulating device is easy to promote; in addition, the filtered blood can flow back to the human body, the demand of the patient for blood transfusion is reduced, and the infection risk and immune response related to blood transfusion are reduced; the blood filtering and circulating device provided by the utility model replaces the mode that the syringe is manually used to extract the thrombus, filter and return the blood for many times, the operation process is simplified, and the operation efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the structure schematic view of the blood filtering and circulating device provided by the utility model embodiment;

[0026] Figure 2 is the structure schematic view of the stop valve arranged on the thrombus suction conduit provided by the utility model embodiment;

[0027] Figure 3 is the structure schematic view of the anticoagulant infusion pipe arranged on the stop valve provided by the utility model embodiment;

[0028] Figure 4 is the structure schematic view of the thrombus filter provided by the utility model embodiment;

[0029] Figure 5 is the structure schematic view of the thrombus filter provided by the utility model embodiment; Figure 4

[0030] Figure 6 is the exploded view of the thrombus filter provided by the utility model embodiment.

[0031] In the drawing:

[0032] 1, negative pressure aspirator; 2, first conduit; 3, thrombus filter; 4, second conduit; 5, third conduit; 6, thrombus suction conduit; 7, switching valve; 8, blood return pipeline; 9, stop valve; 10, anticoagulant infusion pipe;

[0033] ​31, blood inlet; 32, blood outlet; 33, suction port; 34, blood bottle; 341, first cavity; 342, second cavity; 343, first boss; 344, tank body; 345, connecting cylinder; 346, connecting plate; 347, clamping block; 35, filter assembly; 351, first filter; 3511, first filter frame; 3512, filter screen; 3513, second boss; 352, second filter; 3521, second filter frame; 3522, filter membrane; 3523, clamping groove; 36, bottle cap. DETAILED DESCRIPTION

[0034] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0035] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0038] As Figure 1As shown, this embodiment provides a blood filtration and circulation device, which includes a negative pressure aspirator 1, a thrombus filter 3, a thrombus aspiration catheter 6, a switching valve 7, and a blood return line 8. The negative pressure aspirator 1 is connected to a first catheter 2. The thrombus filter 3 is used to filter thrombi and has an inlet 31, a suction port 32, and a suction port 33. The suction port 33 is connected to a second catheter 4, and the suction port 32 is connected to a third catheter 5. The proximal end of the thrombus aspiration catheter 6 is connected to the inlet 31, and the distal end of the catheter 6 is used for insertion into the human body. The first port of the switching valve 7 is connected to the first catheter 2, the second port of the switching valve 7 is connected to the second catheter 4, and the third port of the switching valve 7 is connected to the third catheter 5. The proximal end of the blood return line 8 is connected to the fourth interface of the switching valve 7. The distal end of the blood return line 8 is used for insertion into the human body. The switching valve 7 is used to connect the suction port 33 to the negative pressure aspirator 1 and disconnect the blood collection port 32 from the blood return line 8, or connect the blood collection port 32 to the blood return line 8 and disconnect the suction port 33 from the negative pressure aspirator 1.

[0039] The blood filtration and circulation device provided in this embodiment operates when the switching valve 7 connects the suction port 33 and the negative pressure aspirator 1, creating negative pressure within the thrombus filter 3. Blood from the patient enters the thrombus filter 3 through the suction catheter 6, where the thrombus filter 3 filters the blood clots. After the clots are removed, the negative pressure aspirator 1 stops operating, and the switching valve 7 connects the blood suction port 32 to the blood return line 8. The blood in the thrombus filter 3 flows back into the patient's body through the blood return line 8. This allows for easy control of blood loss during surgery. Furthermore, the device is simple, easy to operate, inexpensive, and readily adopted. Additionally, the filtered blood can be returned to the patient's body, reducing the need for allogeneic blood transfusions and thus lowering the risk of transfusion-related infections and immune responses. This blood filtration and circulation device replaces the manual method of repeatedly removing, filtering, and returning blood using a syringe, simplifying the surgical procedure and improving surgical efficiency.

[0040] The switching valve 7 is a four-way valve. The first catheter 2, second catheter 4, third catheter 5, and blood return line 8 are connected via this four-way valve. When the valve core is in the first position, the suction port 33 is connected to the negative pressure aspirator 1, and the blood collection port 32 is disconnected from the blood return line 8. When the valve core is in the second position, the blood collection port 32 is connected to the blood return line 8, and the suction port 33 is disconnected from the negative pressure aspirator 1. Blood flows back into the body due to gravity and pressure. The four-way valve interlocks the two pathways, reliably and conveniently enabling automatic blood filtration and automatic return functions.

[0041] The aforementioned negative pressure suction device 1 is existing technology and will not be described in detail here.

[0042] like Figure 2 andFigure 3 As shown, in some embodiments, the aspiration catheter 6 is equipped with a shut-off valve 9, which is used to cut off or open the aspiration catheter 6. The aspiration catheter 6 is opened or closed manually by opening or closing the shut-off valve 9. When it is necessary to aspirate blood into the thrombus filter 3, the shut-off valve 9 is opened. When it is not necessary to aspirate blood into the thrombus filter 3, the shut-off valve 9 is closed to prevent blood from flowing between the body and the thrombus filter 3, thereby reducing the amount of blood lost from the body.

[0043] Optionally, the shut-off valve 9 is equipped with an anticoagulant infusion tube 10. The shut-off valve 9 connects the aspiration catheter 6 and simultaneously connects the anticoagulant infusion tube 10 and the aspiration catheter 6. The shut-off valve 9 disconnects the aspiration catheter 6 and simultaneously disconnects the anticoagulant infusion tube 10 and the aspiration catheter 6. When additional blood needs to be aspirated to increase anticoagulation requirements, anticoagulant is injected into the aspiration catheter 6 through the anticoagulant infusion tube 10, and the anticoagulant can be continuously injected under the action of the negative pressure suction device 1. The aspirated blood flow rate and the injected anticoagulant volume are set in a proportional manner, and this proportion is determined by the inner diameter of the aspiration catheter 6 and the inner diameter of the anticoagulant infusion tube 10 under the same negative pressure conditions.

[0044] It should be further explained that, according to Bernoulli's equation: P + ρv 2 / 2 = constant, where P is the fluid pressure, ρ is the fluid density, and v is the flow velocity. Based on the above equation, the flow rate Q = Sv, where S is the pipe cross-sectional area. In two pipes with different cross-sectional areas, the pressure at both points is the same, P. A =P B Then Bernoulli's equation simplifies to: ρv A 2 / 2=ρv B 2 / 2, which means v A =v B Therefore, for pipes with different cross-sectional areas, the flow rate is directly proportional to the cross-sectional area: Q A :Q B =S A :S B =(D A 2 ):(D B 2 The anticoagulant infusion tubing 10 is equipped with a shut-off valve 9, which can automatically adjust the anticoagulant ratio according to clinical needs for blood anticoagulation, thereby achieving special management and control of blood.

[0045] In some embodiments, the blood suction port 32 of the thrombus filter 3 is positioned lower than the blood inlet 31 and the suction port 33. Blood flows from the blood inlet 31 to the bottom of the thrombus filter 3 by its own gravity. When the negative pressure suction device 1 is working, it only suctions air from the thrombus filter 3 and does not suction blood. The blood in the thrombus filter 3 flows to the bottom of the thrombus filter 3 and can flow out of the thrombus filter 3 by gravity, without the need for an additional power element to suction blood from the thrombus filter 3.

[0046] Furthermore, the blood inlet 31 and the suction port 33 are symmetrically arranged with respect to the axis of the thrombus filter 3, so that the negative pressure suction device 1 and the thrombus suction catheter 6 are positioned opposite each other, which facilitates the installation of the thrombus filter 3.

[0047] like Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments, the thrombus filter 3 includes a blood bottle 34, and a filter assembly 35 is detachably provided inside the blood bottle 34. The blood inlet 31, the suction port 33, and the blood suction port 32 are all provided on the blood bottle 34. The filter assembly 35 is used to filter the blood entering through the blood inlet 31 and to filter thrombi in the blood. Blood without thrombi will flow back into the human body through the blood return pipeline 8 after passing through the filter assembly 35.

[0048] The filter assembly 35 includes a first filter element 351 and a second filter element 352. The pore size of the first filter element 351 is larger than that of the second filter element 352. The second filter element 352 is detachably disposed within the blood bottle 34. The second filter element 352 divides the blood bottle 34 to form a first cavity 341 and a second cavity 342. The first filter element 351 is placed within the first cavity 341 and above the second filter element 352. Blood filtered by the first filter element 351 effectively flows through the second filter element 352 for further filtration. The first filter element 351 is detachably connected to the blood bottle 34. The blood inlet 31 and the suction port 33 communicate with the first cavity 341, and the blood suction port 32 communicates with the second cavity 342. Both the first filter element 351 and the second filter element 352 are detachable, facilitating cleaning or replacement of either element to improve blood filtration efficiency. The pore size of the first filter element 351 is larger than that of the second filter element 352. The first filter element 351 is used to filter larger blood clots, while the second filter element 352 is used to filter smaller blood clots, thus improving the filtration effect of blood clots.

[0049] The first filter element 351 includes a first filter frame 3511 and a filter screen 3512. The first end 35111 of the first filter frame 3511 is detachably connected to the blood bottle 34, and the filter screen 3512 is disposed at the second end 35112 of the first filter frame 3511. The filter pore diameter of the filter screen 3512 is 1.5mm-2mm. Optionally, the inner wall of the blood bottle 34 is provided with a first protrusion 343 along the circumferential direction, and the outer wall of the first filter element 351 is provided with a second protrusion 3513 along the circumferential direction. The second protrusion 3513 overlaps the first protrusion 343, facilitating the placement and removal of the first filter element 351. The filter screen 3512 is positioned lower than the blood inlet 31.

[0050] The second filter element 352 includes a second filter frame 3521 and a filter membrane 3522. The first end 35211 of the second filter frame 3521 is detachably connected to the blood bottle 34, and the second filter frame 3521 divides the blood bottle 34 to form a first cavity 341 and a second cavity 342, allowing blood to flow through the filter screen 3512 and then through the filter membrane 3522. The second end 35212 of the second filter frame 3521 is placed inside the second cavity 342, and the filter membrane 3522 is disposed at the second end 35212 of the second filter frame 3521. The second end 35112 of the first filter frame 3511 is inserted into the first end 35211 of the second filter frame 3521, placing the filter membrane 3522 below the filter screen 3512. Blood flows sequentially through the filter screen 3512 and the filter membrane 3522. The filter membrane 3522 is made of PA material, and its pore size is 40μm-200μm. Under the suction of the negative pressure suction device 1, the blood enters the thrombus filter 3 from the human body. The blood flows through the filter screen 3512 and the filter membrane 3522 in sequence by its own gravity and enters the bottom of the blood bottle 34. The filtered blood will flow back into the human body through the blood return pipeline 8.

[0051] Optionally, the blood bottle 34 includes a container body 344 and a connecting cylinder 345. The first end 3451 of the connecting cylinder 345 is flared, and the first end 3451 is detachably connected to the container body 344. The inner sidewall of the first end 3451 of the connecting cylinder 345 is elastically provided with a connecting plate 346 along the circumference. The inner side of the connecting plate 346 is provided with one of a snap-fit ​​block 347 and a snap-fit ​​groove 3523. The outer sidewall of the second filter element 352 is provided with the other of a snap-fit ​​block 347 and a snap-fit ​​groove 3523 along the circumference. The snap-fit ​​block 347 snaps into the snap-fit ​​groove 3523. When the second filter element 352 is installed, the second filter element 352 presses the connecting plate 346, causing the connecting plate 346 to undergo elastic deformation, thereby allowing the snap-fit ​​block 347 to snap into the snap-fit ​​groove 3523. When installing the second filter element 352, the second filter element 352 can be installed on the connecting cylinder 345 first, and then the connecting cylinder 345 can be installed on the tank body 344.

[0052] The first end 3451 of the connecting cylinder 345 is provided with one of a plug groove and a plug block along the circumferential direction, and the end face of the tank body 344 is provided with the other of a plug groove and a plug block. The plug block is inserted into the plug groove, which facilitates the installation and disassembly of the connecting cylinder 345.

[0053] The blood bottle 34 also includes a bottle cap 36, which is detachably connected to the second end 3452 of the connecting cylinder 345. Optionally, the connection structure between the bottle cap 36 and the second end 3452 of the connecting cylinder 345 can be a screw-on structure or a snap-on structure, which is not specifically limited here.

[0054] When using the blood filtration and circulation device provided in this embodiment, first adjust the position of the switching valve 7 to connect the suction port 33 with the negative pressure aspirator 1, and open the shut-off valve 9. If anticoagulant needs to be injected, inject the anticoagulant into the thrombus suction catheter 6 while the negative pressure aspirator 1 is working. When the negative pressure aspirator 1 is working, a negative pressure environment is formed inside the thrombus filter 3. Blood from the human body enters the thrombus filter 3 through the thrombus suction catheter 6 for filtration. After the thrombus in the human body is extracted, close the negative pressure aspirator 1 and the shut-off valve 9, and adjust the position of the switching valve 7 to connect the blood suction port 32 with the blood return line 8. The blood flows back into the human body through the blood return line 8.

[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 blood filtration and circulation device, characterized in that, include: A negative pressure suction device (1), wherein the negative pressure suction device (1) is connected to a first catheter (2); A thrombus filter (3) is used to filter thrombi. The thrombus filter (3) has a blood inlet (31), a blood draw port (32) and a suction port (33). The suction port (33) is connected to a second catheter (4), and the blood draw port (32) is connected to a third catheter (5). A suction catheter (6), the proximal end of which is connected to the blood inlet (31), and the distal end of which is used for insertion into the human body; A switching valve (7) is provided, wherein the first port of the switching valve (7) is connected to the first conduit (2), the second port of the switching valve (7) is connected to the second conduit (4), and the third port of the switching valve (7) is connected to the third conduit (5). A blood return line (8) is provided, the proximal end of which is connected to the fourth interface of the switching valve (7), the distal end of which is used for insertion into the human body, and the switching valve (7) is used to connect the suction port (33) to the negative pressure aspirator (1) and disconnect the blood draw port (32) from the blood return line (8), or connect the blood draw port (32) to the blood return line (8) and disconnect the suction port (33) from the negative pressure aspirator (1).

2. The blood filtration and circulation device according to claim 1, characterized in that, The suction catheter (6) is provided with a shut-off valve (9), which is used to cut off or open the suction catheter (6).

3. The blood filtration and circulation device according to claim 2, characterized in that, The shut-off valve (9) is provided with an anticoagulant infusion tube (10). The shut-off valve (9) connects the thrombectomy tube (6) and simultaneously connects the anticoagulant infusion tube (10) and the thrombectomy tube (6). The shut-off valve (9) cuts off the thrombectomy tube (6) and simultaneously cuts off the anticoagulant infusion tube (10) and the thrombectomy tube (6).

4. The blood filtration and circulation device according to claim 1, characterized in that, The blood sampling port (32) is positioned below the blood inlet (31) and the suction port (33).

5. The blood filtration and circulation device according to claim 4, characterized in that, The blood inlet (31) and the suction port (33) are symmetrically arranged with respect to the axis of the thrombus filter (3).

6. The blood filtration and circulation device according to any one of claims 1-5, characterized in that, The thrombus filter (3) includes a blood bottle (34), and a filter assembly (35) is detachably provided inside the blood bottle (34). The blood inlet (31), the suction port (33) and the blood drawing port (32) are all provided on the blood bottle (34). The filter assembly (35) is used to filter the blood entering through the blood inlet (31).

7. The blood filtration and circulation device according to claim 6, characterized in that, The filter assembly (35) includes a first filter element (351) and a second filter element (352). The pore size of the first filter element (351) is larger than that of the second filter element (352). The second filter element (352) is detachably disposed inside the blood bottle (34). The second filter element (352) separates the blood bottle to form a first cavity (341) and a second cavity (342). The first filter element (351) is placed inside the first cavity (341) and above the second filter element (352). The first filter element (351) is detachably connected to the blood bottle (34). The blood inlet (31) and the suction port (33) are connected to the first cavity (341), and the blood suction port (32) is connected to the second cavity (342).

8. The blood filtration and circulation device according to claim 7, characterized in that, The first filter element (351) includes a first filter frame (3511) and a filter screen (3512). The first end (35111) of the first filter frame (3511) is detachably connected to the blood bottle (34), and the filter screen (3512) is disposed at the second end (35112) of the first filter frame (3511). The second filter element (352) includes a second filter frame (3521) and a filter membrane (3522). The first end (35211) of the second filter frame (3521) is detachably connected to the blood bottle (34), and the second filter frame (3521) separates the blood bottle (34) to form the first cavity (341) and the second cavity (342). The second end (35212) of the second filter frame (3521) is placed in the second cavity (342), and the filter membrane (3522) is disposed at the second end (35212) of the second filter frame (3521). The second end (35112) of the first filter frame (3511) is inserted into the first end (35211) of the second filter frame (3521).

9. The blood filtration and circulation device according to claim 7, characterized in that, The blood bottle (34) has a first protrusion (343) on its inner sidewall in the circumferential direction, and the first filter element (351) has a second protrusion (3513) on its outer sidewall in the circumferential direction. The second protrusion (3513) overlaps the first protrusion (343).

10. The blood filtration and circulation device according to claim 7, characterized in that, The blood bottle (34) includes a container (344) and a connecting tube (345). The first end (3451) of the connecting tube (345) is flared. The first end (3451) of the connecting tube (345) is detachably connected to the container (344). The inner side wall of the first end (3451) of the connecting tube (345) is elastically provided with a connecting plate (346) along the circumferential direction. The inner side of the connecting plate (346) is provided with one of a snap-fit ​​block (347) and a snap-fit ​​groove (3523). The outer side wall of the second filter element (352) is provided with the other of the snap-fit ​​block (347) and the snap-fit ​​groove (3523) along the circumferential direction. The snap-fit ​​block (347) is snapped into the snap-fit ​​groove (3523).

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