Blood recovery device

Abstract

The invention provides a blood recovery device, belongs to the technical field of medical instruments, and solves the problem that an existing thrombus suction device cannot effectively filter sucked blood. The device comprises a recovery container, the bottom of the recovery container is provided with an inlet, and the inlet is fixedly connected with a first port of a blood inlet pipe; the filter cap is hermetically connected with the top of the recovery container, and the filter cap and the recovery container form a sealed cavity; the filtering device is arranged in the sealed cavity and is fixedly connected to the bottom of the filtering cap; the outlet is formed in the top of the filtering cap, a one-way connector is arranged at a first port of the outlet, and a second port of the outlet is communicated with the filtering device. The device can remove thrombus, impurities and other harmful substances in blood and improve the filtering purity and quality of the recovered blood.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 670,572, filed on July 12, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present invention relates to the technical field of medical devices, and in particular to a blood recovery device. Background Art

[0004] In the medical field, the development of blood recovery and purification technology is of great significance for improving surgical safety and reducing the burden on patients. Traditional blood recovery methods often have problems such as low recovery efficiency and difficulty in ensuring blood quality, which has prompted the research and development and application of blood recovery devices. As an advanced medical device, the blood recovery machine collects blood lost during surgery through a negative pressure suction device and undergoes a series of processing steps to make it suitable for reuse. However, a single filtration method is often difficult to completely remove impurities and harmful substances in the blood, affecting the quality and safety of the recovered blood. Summary of the invention

[0005] The present invention provides a blood recovery device, which solves the problem that the existing thrombus aspiration device cannot effectively filter the aspirated blood.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] An embodiment of the present invention provides a blood recovery device, comprising:

[0008] A recovery container, wherein the bottom of the recovery container is provided with an inlet, and the inlet is fixedly connected to the first port of the blood inlet;

[0009] A filter cap sealed to the top of the recovery container, wherein the filter cap and the recovery container form a sealed cavity;

[0010] A filter device is disposed in the sealed cavity, and the filter device is fixedly connected to the bottom of the filter cap;

[0011] An outlet is arranged at the top of the filter cap, a first port of the outlet is provided with a one-way joint, and a second port of the outlet is communicated with the filter device.

[0012] Optionally, the filtering device comprises: at least two layers of nested filters.

[0013] Optionally, the filtering device includes: a first filter and a second filter, wherein the second filter is arranged inside the first filter.

[0014] Optionally, the first filter is a filter barrel, the top of the filter barrel is fixedly connected to the filter cap to form a cavity, and the surface of the filter barrel is provided with filter mesh holes;

[0015] The second filter is a filter ring, the inner ring of the filter ring is provided with filter paper, and the outer ring of the filter ring is clamped on the inner wall of the filter barrel.

[0016] Optionally, the first filter includes a first filter membrane, the first filter membrane is conical, and the top of the first filter membrane is fixedly connected to the filter cap to form a cavity;

[0017] The second filter includes a second filter membrane, and the second filter membrane is attached to the inner surface of the first filter membrane.

[0018] Optionally, both the first filter membrane and the second filter membrane are made of polyester material; the filter mesh diameter of the first filter membrane is 35 μm to 45 μm; the filter mesh diameter of the second filter membrane is 200 μm to 300 μm.

[0019] Optionally, an exhaust valve is also provided on the top of the filter cap, and the exhaust valve includes an exhaust hole and a handle, a first outlet of the exhaust hole is connected to the sealed cavity, and a second outlet of the exhaust hole is movably connected to the handle, and when the handle is rotated to a first position, the exhaust hole is connected to the sealed cavity; when the handle is rotated to a second position, the exhaust hole is separated from the sealed cavity.

[0020] Optionally, the second port of the blood inlet is fixedly connected to the rotating plug.

[0021] Optionally, the rotary plug comprises:

[0022] a base having an interior cavity;

[0023] A first port and a second port are provided at the bottom of the base and communicated with the cavity of the base, wherein the first port of the base is fixedly connected to the second port of the blood inlet;

[0024] A valve core is sleeved in the cavity of the base, the interior of the valve core is hollow, and an opening is provided on the top of the valve core;

[0025] A rotary valve is sleeved on the outside of the valve core and rotatably connected to the end of the base. When the rotary valve rotates to the third position, the base is connected to the valve core; when the rotary valve rotates to the fourth position, the base is separated from the valve core.

[0026] A method for preparing a filtering device, comprising:

[0027] Available in polyester material;

[0028] The polyester material is subjected to a spinning and weaving process to form a first filter membrane and a second filter membrane, wherein the diameter of the weaving wire of the second filter membrane is greater than the diameter of the weaving wire of the first filter membrane;

[0029] The second surface of the first filter membrane and the first surface of the second filter membrane are folded tightly together and heat-sealed to obtain a filtering device, wherein the warps of the first filter membrane and the second filter membrane are parallel, and the wefts of the first filter membrane and the second filter membrane are parallel.

[0030] The technical solution of the present invention includes at least the following effects:

[0031] The blood recovery device of the present invention comprises: a recovery container, wherein an inlet is provided at the bottom of the recovery container, and the inlet is fixedly connected to a first port of an inlet blood vessel; a filter cap sealedly connected to the top of the recovery container, and the filter cap and the recovery container form a sealed cavity; a filter device arranged in the sealed cavity, and the filter device is fixedly connected to the bottom of the filter cap; an outlet is arranged at the top of the filter cap, and a one-way joint is provided at the first port of the outlet, and a second port of the outlet is connected to the filter device; the device is an efficient, safe, convenient device suitable for recovering the patient's own blood, and by recovering and processing the patient's blood and removing harmful substances such as thrombus and impurities in the blood, the patient's own blood can be reused in the patient's body, effectively recovering the patient's blood after blood loss, and realizing the return of healthy blood to the patient's vascular system, reducing the need for blood transfusion, avoiding the waste of blood, and improving the utilization efficiency of medical resources; at the same time, the device adopts a disposable design, which reduces the risk of cross infection, improves the safety of the patient, and has a simple operation process and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a blood recovery device provided by an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of a filter device of a blood recovery device provided in an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the filter membrane and fixed ring structure of a blood recovery device provided by an embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of the position of the filter membrane and the positioning holes of the blood recovery device provided by an embodiment of the present invention;

[0036] Figure 5 is a schematic structural diagram of a filter cap provided with an exhaust valve provided in an embodiment of the present invention;

[0037] Figure 6is a schematic diagram of the rotary plug structure of a blood recovery device provided by an embodiment of the present invention;

[0038] Figure 7 is a schematic diagram of the filter membrane structure of a blood recovery device provided by an embodiment of the present invention;

[0039] Among them, 1. recovery container; 2. inlet; 3. blood inlet; 4. filter cap; 5. sealing cavity; 6. positioning hole; 7. outlet; 8. one-way joint; 9. filter barrel; 10. filter ring; 11. filter paper; 12. first filter membrane; 13. second filter membrane; 14. exhaust valve; 15. rotary plug; 16. base; 17. valve core; 18. rotary valve; 19. first fixing ring; 20. second fixing ring; 21. warp; 22. weft; 23. internal control; 24. cone surface; 25. filter mesh. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0041] like Figure 1 As shown, an embodiment of the present invention provides a blood recovery device, comprising:

[0042] A recovery container 1, wherein an inlet 2 is provided at the bottom of the recovery container 1, and the inlet 2 is fixedly connected to a first port of a blood inlet 3;

[0043] A filter cap 4 is sealed and connected to the top of the recovery container 1, and the filter cap 4 and the recovery container 1 form a sealed cavity 5;

[0044] A filter device is disposed in the sealed cavity 5, and the filter device is fixedly connected to the bottom of the filter cap 4;

[0045] An outlet 7 is provided at the top of the filter cap 4 , a first port of the outlet 7 is provided with a one-way joint 8 , and a second port of the outlet 7 is communicated with the filter device.

[0046] In this example, the blood recovery device includes a recovery container 1, a filter cap 4, and a filter device, wherein the recovery container 1 is in the shape of a cylinder, with a closed bottom and a round opening on the top, and can be made of a transparent high-molecular polypropylene material; an inlet 2 is provided at the bottom of the recovery container 1, and the inlet 2 is fixedly connected to the first port of the blood inlet 3, and the connection method can be clamping or bonding; a filter cap 4 is sealed and connected to the top of the recovery container 1, and the connection method between the recovery container 1 and the filter cap 4 can be clamping or threaded connection, and the filter cap 4 and the recovery container 1 form a sealed cavity 5, and the interior of the sealed cavity 5 is a sealed sterile environment, which can avoid secondary contamination of blood; a filter device is provided in the sealed cavity 5, and the filter device is fixedly connected to the bottom of the filter cap 4, and the fixing method can be adopted. The connection can be made by bonding or snap-on; an outlet 7 is provided on the top of the filter cap 4, and a one-way joint 8 is provided at the first port of the outlet 7, through which the blood drawing device can be conveniently connected to the outlet 7, and the blood with thrombi and other impurities temporarily stored in the sealed cavity 5 is filtered by the filtering device, and the thrombi and other impurities are retained in the sealed cavity 5, while the clean blood from which the thrombi and other impurities are filtered out enters the blood drawing device through the outlet 7; the device can remove harmful substances such as thrombi and impurities in the blood, improve the purity and quality of the recovered blood, realize the return of healthy blood to the patient's vascular system, reduce the need for blood transfusion, reduce the risk of infection caused by blood transfusion, and improve the safety of the patient; the device can also be reused, which improves the economy.

[0047] An embodiment of the present invention provides a blood recovery device, wherein the filtering device comprises:

[0048] At least two layers of nested filters; preferably, the filtering device comprises:

[0049] A first filter and a second filter, wherein the second filter is disposed inside the first filter.

[0050] In this example, the filtering device adopts a multi-stage setting, including at least a first filter and a second filter; each stage of the filtering device can be combined with different pore sizes and materials, wherein the second filter is arranged inside the first filter to filter the collected blood step by step; for example, the first filter can be set as a coarse filter screen, and the second filter can be set as a fine filter screen or a microporous membrane, and the coarse filter screen is first used to remove large impurities and particulate matter in the blood; then, fine filter elements such as fine filter screens or microporous membranes are used to further remove tiny particles, cell fragments and harmful components in the blood; through the multi-stage setting, the filtering effect of blood clots in the blood can be improved.

[0051] like Figure 2As shown, an embodiment of the present invention proposes a blood recovery device, wherein the first filter is a filter barrel 9, the top of the filter barrel 9 is fixedly connected to the filter cap 4 to form a cavity, and the surface of the filter barrel 9 is provided with a filter mesh 25; the second filter is a filter ring 10, the inner circle of the filter ring 10 is provided with filter paper 11, and the outer circle of the filter ring 10 is clamped on the inner wall of the filter barrel 9.

[0052] In this example, the first filter of the blood recovery device is a filter barrel 9, which is made of injection-molded polypropylene material or polyethylene material. The filter barrel 9 is a hollow cylindrical shape with a filter mesh 25 on its surface. The top of the filter barrel 9 is arranged around the outlet 7 and is fixed to the bottom of the filter cap 4 by snapping or bonding. The second filter is a filter ring 10, which is made of silicone material. The inner ring of the filter ring 10 is provided with filter paper 11, which is made of nylon material. The outer ring of the filter ring 10 is provided with a filter paper 11. The filter paper 11 is made of nylon material. The ring is clamped on the inner wall of the filter barrel 9; the filter barrel 9 and the filter ring 10 are in sealed contact; when in use, the blood with thrombus and other impurities temporarily stored in the sealed cavity 5 is filtered by the filter barrel 9, and large thrombus and other impurities are blocked outside the filter barrel 9, while tiny particles enter the inner cavity of the filter barrel 9 with the blood, and are filtered again by the filter ring 10, so that the tiny particles are blocked in the inner cavity between the filter barrel 9 and the filter ring 10, and the clean blood with impurities filtered out enters the blood drawing device through the outlet 7.

[0053] like Figure 3 As shown, an embodiment of the present invention proposes a blood recovery device, wherein the first filter includes a first filter membrane 12, the first filter membrane 12 is conical, and the top of the first filter membrane 12 is fixedly connected to the filter cap 4 to form a cavity; the second filter includes a second filter membrane 13, and the second filter membrane 13 is attached to the inner surface of the first filter membrane 12.

[0054] In this example, Figure 3 and Figure 7 As shown, the first filter of the blood recovery device is a first filter membrane 12, which is conical and made of woven polyester wire, and has good biocompatibility and stability. The diameter of the filter mesh 25 of the first filter membrane 12 is 35 μm to 45 μm, which can effectively filter out thrombi and emboli in the blood, and can pass limited components in the blood, such as white blood cells, red blood cells, platelets, etc. The first filter membrane 12 is conical in shape, and its top is fixedly connected to the filter cap 4 to form a cavity;

[0055] The second filter is a second filter membrane 13, which is tightly attached to the inner surface of the first filter membrane 12 and is made of polyester material. The diameter of the filter mesh 25 is 200μm to 300μm, which can provide good support, so that the first filter membrane 12 and the second filter membrane 13 can maintain a three-dimensional cone shape when filtering blood, maintain a very high filtration efficiency, and will not be eroded and deformed by the rapidly passing blood flow.

[0056] like Figure 5 As shown, an embodiment of the present invention proposes a blood recovery device, wherein an exhaust valve 14 is further provided on the top of the filter cap 4, and the exhaust valve 14 includes an exhaust hole and a handle, a first outlet of the exhaust hole is connected to the sealed cavity 5, and a second outlet of the exhaust hole is movably connected to the handle, when the handle is rotated to a first position, the exhaust hole is connected to the sealed cavity 5; when the handle is rotated to a second position, the exhaust hole is separated from the sealed cavity 5.

[0057] In this example, an exhaust valve 14 is also provided on the top of the filter cap 4 of the blood recovery device, and the exhaust valve 14 is used to prevent pressure from accumulating in the sealed cavity 5, so as to prevent the blood from being pressurized and overflowing when flowing into or out of the sealed cavity 5, thereby eliminating safety hazards; the exhaust valve 14 includes an exhaust hole and a handle, the first outlet of the exhaust hole is connected to the sealed cavity 5, and the second outlet of the exhaust hole is movably connected to the handle, when the handle is rotated to the first position, the exhaust hole is connected to the sealed cavity 5; when the handle is rotated to the second position, the exhaust hole is separated from the sealed cavity 5; when in use, the handle is first rotated to the first position, the exhaust hole is connected to the sealed cavity 5, and blood is injected into the sealed cavity 5 for filtering and extraction.

[0058] like Figure 6 As shown, an embodiment of the present invention provides a blood recovery device, wherein the second port of the blood inlet 3 is fixedly connected to a rotary plug 15, and the rotary plug 15 comprises:

[0059] A base 16 having an internal cavity;

[0060] A first port and a second port are provided at the bottom of the base 16 and communicated with the cavity of the base 16 , wherein the first port of the base 16 is fixedly connected to the second port of the blood inlet 3 ;

[0061] A valve core 17 is sleeved in the cavity of the base 16, the interior of the valve core 17 is hollow, and the top of the valve core 17 is provided with an opening;

[0062] A rotary valve 18 is sleeved on the outside of the valve core 17 and rotatably connected to the end of the base 16. When the rotary valve 18 rotates to the third position, the base 16 is connected to the valve core 17; when the rotary valve 18 rotates to the fourth position, the base 16 is separated from the valve core 17.

[0063] In this example, the inlet 2 of the blood recovery device is fixedly connected to the first port of the blood inlet 3, and the second port of the blood inlet 3 is fixedly connected to the rotary plug 15, and the rotary plug 15 is used to control the conduction and closing of the blood inlet 3; the rotary plug 15 includes a base 16 with an internal cavity; the bottom of the base 16 is provided with a first port and a second port connected to the cavity of the base 16, wherein the first port of the base 16 is fixedly connected to the second port of the blood inlet 3, the second port of the base 16 is connected to the first port of the blood transfusion blood vessel, and the first syringe connector is provided to the second port of the blood transfusion blood vessel, and the blood transfusion blood vessel is connected to the first syringe through the first syringe connector; a valve core 17 is sleeved in the cavity of the base 16, the interior of the valve core 17 is hollow, and an opening is provided on the top, and the opening is designed with a Luer connector, and the syringe can be connected to the rotary plug 15 through the Luer connector to flush the interior of the rotary plug 15 and fill it. The valve core 17 is provided with a rotary valve 18 on the outside, and the rotary valve 18 is designed with a two-way three-hole structure. The base passage is opened or not by rotation. When the rotary valve 18 is in the same direction as the base 16 interface, the base 16 passage is opened; when the rotary valve 18 is perpendicular to the base 16 interface, the base 16 passage is closed. When in use, the first syringe is connected to the first syringe connector, the second syringe is connected to the Luer interface on the outlet 7, the rotary valve 18 is rotated to the same direction as the base 16 interface, the base 16 passage is opened, and the blood to be filtered stored in the first syringe is pushed into the sealed cavity 5 of the recovery container 1 through the blood transfusion tube, the rotary plug 15 and the blood inlet 3. The blood to be filtered is filtered through the filtering device in the sealed cavity 5 to filter the blood clots and other impurities, and the clean blood is extracted into the second syringe through the outlet 7 to achieve blood filtering.

[0064] An embodiment of the present invention further provides a method for preparing a filter device, comprising:

[0065] Step 711, providing a polyester material;

[0066] Step 712, performing a spinning and weaving process on the polyester material to form a first filter membrane 12 and a second filter membrane 13, wherein the diameter of the weaving wire of the second filter membrane 13 is greater than the diameter of the weaving wire of the first filter membrane 12;

[0067] Step 713, fold the second surface of the first filter membrane 12 and the first surface of the second filter membrane 13 tightly together and perform heat sealing to obtain a filtering device, such as Figure 7As shown, the longitudes of the first filter membrane 12 and the second filter membrane 13 are parallel, and the latitudes of the first filter membrane 12 and the second filter membrane 13 are parallel.

[0068] In this example, the filter device is made of polyester material during manufacturing. The polyester material has good biocompatibility and stability. First, the polyester material is subjected to a spinning and weaving process. The weaving wire is a single wire, which is woven in two directions of warp and weft by a one-press-one-weave method to form a first filter membrane 12 and a second filter membrane 13. The diameter of the filter mesh 25 of the first filter membrane 12 is 35 μm to 45 μm, which can effectively filter out thrombi and emboli in the blood, and at the same time pass limited components in the blood, such as white blood cells, red blood cells, Platelets, etc., the first filter membrane 12 is conical in shape, and its top is fixedly connected to the filter cap 4 to form a cavity; the second filter membrane 13 is tightly attached to the inner surface of the first filter membrane 12, and its filter mesh 25 has a diameter of 200μm to 300μm; wherein, the braided wire used to make the second filter membrane 13 is relatively coarse and can provide good support, so that the first filter membrane 12 and the second filter membrane 13 can maintain a three-dimensional cone shape when filtering blood, maintain a very high filtration efficiency, and will not be eroded and deformed by the rapidly passing blood flow.

[0069] When the two filter membranes are sealed by heat sealing, the warp and weft of the two filter membranes need to be parallel and close to each other, then folded in half to heat-seal the four edges neatly. In order to achieve better edge sealing requirements, the first filter membrane 12 and the second filter membrane 13 are pre-cut by laser cutting. The first filter membrane 12 and the second filter membrane 13 are placed horizontally and vertically during pre-cutting, and the laser cutting is formed in one step. After cutting, the filter membrane shape is designed with four positioning holes 6, such as Figure 4 As shown, the positioning hole 6 maintains a fixed relative position relationship with the longitude and latitude of the first filter membrane 12 and the second filter membrane 13, so it is only necessary to ensure that the positioning holes 6 of the first filter membrane 12 and the second filter membrane 13 are aligned so that the longitude and latitude are parallel; the positioning tool is installed on the heat-sealing equipment, and the edge of the tool is aligned with the sealing line of the equipment to ensure the accuracy of the sealing position; the positioning tool is designed with a positioning column, which can be matched with the positioning holes 6 on the first filter membrane 12 and the second filter membrane 13. The first filter membrane 12 and the second filter membrane 13 are installed on the tool through the positioning column and the positioning hole 6 to ensure that the longitude and latitude of the first filter membrane 12 and the second filter membrane 13 are parallel, and the tool is designed with an upper cover plate. After the first filter membrane 12 and the second filter membrane 13 are folded in half, they can be pressed with the upper cover plate to ensure that the first filter membrane 12 and the second filter membrane 13 are tightly fitted, and the operating equipment performs a heat-sealing process on the first filter membrane 12 and the second filter membrane 13, and at the same time, the four edges of the first filter membrane 12 and the second filter membrane 13 are neatly heat-sealed together.

[0070] In order to better fix the first filter membrane 12 and the second filter membrane 13 on the bottom of the filter cap 4, as shown in FIG. Figure 3As shown, this can be achieved by cooperating with the first fixing ring 19 and the second fixing ring 20, wherein the central outer contour of the first fixing ring 19 is designed with a conical surface, which has the same taper as the first filter membrane 12 and the second filter membrane 13, and the outer diameter size is closely matched with the inner diameter of the filter membrane. The inner hole of the second fixing ring 20 in the figure is also designed with the same taper as the first filter membrane 12 and the second filter membrane 13, and the inner diameter size is closely matched with the outer diameter of the first filter membrane 12 and the second filter membrane 13. The first filter membrane 12 and the second filter membrane 13 are sleeved on the conical surface of the first fixing ring 19, glue is applied on the outer surface, and then the second fixing ring 20 is pushed along the first filter membrane 12 to the bottom of the conical surface of the first fixing ring 19, the first filter membrane 12 and the second filter membrane 13 are pressed between the conical surface of the first fixing ring 19 and the inner hole of the second fixing ring 20, and the first fixing ring 19, the second fixing ring 20, the first filter membrane 12 and the second filter membrane 13 are tightly bonded together by glue, and the first filter membrane 12 and the second filter membrane 13 are fixedly installed at the bottom of the filter cap 4. The filtration device can remove harmful substances such as blood clots and impurities in the blood, improve the filtration purity and quality of recovered blood, return healthy blood to the patient's vascular system, reduce the need for blood transfusions, reduce the risk of infection caused by blood transfusions, and improve patient safety; the device can also be reused, improving economic efficiency.

[0071] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A blood recovery device, characterized in that: include: A recovery container (1), wherein the bottom of the recovery container (1) is provided with an inlet (2), and the inlet (2) is fixedly connected to a first port of a blood inlet (3); a filter cap (4) hermetically connected to the top of the recovery container (1), the filter cap (4) and the recovery container (1) forming a sealed cavity (5); A filter device is arranged in the sealed cavity (5), and the filter device is fixedly connected to the bottom of the filter cap (4); An outlet (7) is provided at the top of the filter cap (4), a first port of the outlet (7) is provided with a one-way joint (8), and a second port of the outlet (7) is connected to the filter device; The filter device is prepared by the following process: Providing a polyester material; performing a spinning and weaving process on the polyester material to form at least two nested filters, wherein two adjacent filters of the at least two filters are folded tightly together and heat-sealed; wherein the warps of the two adjacent filters are parallel, and the wefts of the two adjacent filters are parallel.

2. The blood recovery device according to claim 1, characterized in that: The filtering device comprises: a first filter and a second filter, wherein the second filter is arranged inside the first filter.

3. The blood recovery device according to claim 2, characterized in that: The first filter comprises a first filter membrane (12), the first filter membrane (12) is conical, and the top of the first filter membrane (12) is fixedly connected to the filter cap (4) to form a cavity; The second filter comprises a second filter membrane (13), and a first surface of the second filter membrane (13) is attached to a second surface of the first filter membrane (12).

4. The blood recovery device according to claim 3, characterized in that: The diameter of the filter mesh (25) of the first filter membrane (12) is 35 μm to 45 μm; the diameter of the filter mesh (25) of the second filter membrane (13) is 200 μm to 300 μm.

5. The blood recovery device according to claim 1, characterized in that: The top of the filter cap (4) is also provided with an exhaust valve (14), the exhaust valve (14) comprising an exhaust hole and a handle, a first outlet of the exhaust hole being in communication with the sealed cavity (5), and a second outlet of the exhaust hole being movably connected with the handle, and when the handle is rotated to a first position, the exhaust hole is in communication with the sealed cavity (5); when the handle is rotated to a second position, the exhaust hole is isolated from the sealed cavity (5).

6. The blood recovery device according to claim 1, characterized in that: The second port of the blood inlet (3) is fixedly connected to the rotating plug (15).

7. The blood recovery device according to claim 6, characterized in that: The rotary plug (15) comprises: a base (16) having an internal cavity; A first port and a second port are provided at the bottom of the base (16) and communicated with the cavity of the base (16), the first port of the base (16) being fixedly connected to the second port of the blood inlet (3); A valve core (17) is sleeved in the cavity of the base (16), the interior of the valve core (17) is hollow, and an opening is provided at the top of the valve core (17); A rotary valve (18) is sleeved on the outside of the valve core (17) and is rotatably connected to the end of the base (16); when the rotary valve (18) rotates to a third position, the base (16) is connected to the valve core (17); when the rotary valve (18) rotates to a fourth position, the base (16) is disconnected from the valve core (17).

8. A method for preparing a filtering device, characterized in that: include: Available in polyester material; The polyester material is subjected to a spinning and weaving process to form at least two nested filters; Two adjacent filters of the at least two filters are folded tightly together and heat-sealed to obtain a filtering device; wherein the warps of the two adjacent filters are parallel, and the wefts of the two adjacent filters are parallel.

9. The method for preparing the filter device according to claim 8, characterized in that: The filters that form at least two nested settings include: forming a first filter membrane (12) and a second filter membrane (13) which are nested, wherein the diameter of the braided wire of the second filter membrane (13) is greater than the diameter of the braided wire of the first filter membrane (12); Two adjacent filters of the at least two filters are folded tightly together and heat-sealed to obtain a filtering device, comprising: The second surface of the first filter membrane (12) and the first surface of the second filter membrane (13) are folded tightly together and heat-sealed to obtain a filtering device, wherein the warps of the first filter membrane (12) and the second filter membrane (13) are parallel, and the wefts of the first filter membrane (12) and the second filter membrane (13) are parallel.

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