A thrombus filtration and reinfusion device

Abstract

A thrombus filtration and reinfusion device includes a thrombus filtration structure and a blood receiving structure not in the same vertical space. The thrombus filtration structure has a receiving cavity 1 for receiving blood containing thrombi, and the blood receiving structure has a receiving cavity 2 for receiving filtered blood. The two receiving cavities are connected by multiple connecting tubes. A filter tube with a filter membrane is installed in the receiving cavity 1 from bottom to top, and the filter tube is positioned slightly higher than the bottom of the receiving cavity 1. The blood in the receiving cavity 1 first settles to the bottom by gravity, and then passes through the filter membrane in the filter tube from bottom to top, so that less thrombus is deposited on the filter membrane, reducing the frequency of filtration blockage. A blood reinfusion tube 1 is also provided. When a certain amount of blood is collected in the receiving cavity 2, the blood is reinfused through the blood reinfusion tube 1, which connects only the receiving cavity 2 and the blood reinfusion tube 2 of the thrombus aspiration tube, greatly avoiding the problem of excessive blood loss in patients during thrombus treatment.

Description

Technical Field

[0001] This invention belongs to the technical field of devices for the treatment and reinfusion of thrombus-containing blood after venous thrombosis, specifically thrombus filtration and reinfusion devices. Background Technology

[0002] The treatment for deep vein thrombosis in the lower extremities involves inserting a thrombus aspiration cannula into the thrombus location and using suction to remove the thrombus. The aspirated thrombus is then expelled from the body through the aspiration cannula. During the thrombus aspiration process, a large amount of blood is lost. Often, the total blood loss during the entire thrombus treatment process can exceed 400 ml. Such a large amount of blood loss can cause ischemia in the patient.

[0003] The prior art CN213852344U - a thrombus aspiration system - utilizes a filter structure and a blood container structure, both integrally arranged in a vertical space, to process and collect the aspirated blood. In this processing method, the thrombus is collected by the filter structure, which is very easy to cause clogging of the filter structure. In addition, since the filter structure and the blood container structure are in the same vertical space, when clogging occurs, the processing of the filter structure can easily affect the blood container structure below, which can easily cause blood contamination during the processing of the filter structure. Summary of the Invention

[0004] To address the aforementioned issues, this application places the filtration structure and the filtered blood-containing structure in different vertical spaces. Filtration and blood-containing operations are performed through these two relatively independent vertical spaces. Furthermore, suction force is used to direct blood against gravity through the filter membrane of the filtration structure, and the filter membrane is not positioned at the lowest point of the filtration structure. This method allows blood clots within the blood to settle to the bottom of the filtration structure due to gravity. Even when the filtration structure is covered with excessive blood clots, they easily fall to the area below the filter membrane under gravity, ensuring that the filter membrane always has adequate filtration space. This arrangement effectively solves the problem of filter membrane clogging caused by catching all the blood clots in existing technologies. Additionally, because the filtration structure and the blood-containing structure are not in the same vertical space, even if the filter membrane becomes clogged, the processing of the filter membrane will not be affected by contamination due to vertical overlap.

[0005] The specific technical solution is as follows: a thrombus filtration and reinfusion device, which includes a thrombus filtration structure and a blood containing structure.

[0006] The thrombus filtration structure includes a receiving cavity, a connecting tube, and a filtering tube. The receiving cavity is used to receive blood containing thrombi. The first end of the connecting tube extends into the receiving cavity and the second end is connected to a thrombus aspiration tube. The connecting tube includes an aspiration port communicating with the thrombus aspiration tube and a receiving cavity port communicating with the receiving cavity. A filtering membrane is provided inside the filtering tube, and the filtering tube extends upward from the bottom of the receiving cavity 11 along the side wall of the receiving cavity 11. The filtering tube includes an upper port and a lower port.

[0007] The blood containing structure includes a second containing cavity for containing filtered blood; the blood containing structure also includes a second connecting pipe and a third connecting pipe, one end of the second connecting pipe extending into the bottom of the second containing cavity, and the other end communicating with the upper opening of the filtering pipe, the opening of the second connecting pipe in the second containing cavity being the second containing cavity opening; the third connecting pipe includes a third containing cavity opening communicating with the containing cavity and a pressure connection port communicating with the pressure supply structure; the third containing cavity opening is located near the top of the second containing cavity. Blood reinfusion line one includes at least connecting line two and connecting line three disposed in receiving cavity two; when the blood filtration structure and the blood receiving structure are integrally connected, blood reinfusion line one also includes connecting line four, which is used to communicate with thrombus aspiration tube; when the blood filtration structure and the blood receiving structure are combined and connected, connecting line two is also used to communicate with thrombus aspiration tube. The thrombus filtration structure and the blood containment structure are located in different vertical spaces. The first and second containment cavities occupy independent vertical spaces. The thrombus filtration structure and the blood containment structure are integrally connected or combined. In use, the thrombus filtration structure and the blood containment structure form a well-sealed interconnected space except for the suction port and the pressure connection port.

[0008] Furthermore, the receiving cavity has only one lowest point, and the lowest position of the lower opening of the filter tube is higher than the lowest point of the receiving cavity. The opening of the lower opening faces away from the lowest point. This method can ensure that the thrombus settles further first, so that the thrombus gathers and settles at the bottom. The orientation of the lower opening can ensure that the blood flow of aspirated blood will not carry the blood flow deposited at the lowest point, thus allowing the thrombus to settle steadily at the lowest point. This minimizes the risk of the thrombus passing through the filter membrane with the blood flow, further reducing the frequency of filter membrane blockage and ensuring that the whole operation is faster and more efficient.

[0009] Furthermore, the lowest point of the receiving cavity opening of the connecting pipe is consistent with the lowest point of the receiving cavity, allowing blood to flow to the bottom through the connecting pipe; or, the receiving cavity opening is positioned facing and close to the side wall of the receiving cavity, allowing the blood flowing out through the receiving cavity opening to flow downwards along the side wall of the receiving cavity. Both of these configurations ensure that the blood is flowing throughout the entire process of aspirating blood containing thrombi, preventing dripping and thus protecting blood cells throughout the process, ensuring the integrity of blood cells, and preventing damage to blood cells due to dripping.

[0010] Furthermore, a metering tube extends from the receiving cavity opening three along the longitudinal axis of the connecting pipe three towards the receiving cavity two. A metering ball, which remains within the metering tube and moves along its longitudinal axis, is contained within the metering tube. An opening communicating with the receiving cavity two is provided at the bottom of the metering tube. The diameter of the metering ball is larger than the diameter of the receiving cavity opening three. This causes the blood level in the receiving cavity two to push the metering ball upwards. Blood collection stops when the metering ball blocks the receiving cavity opening three. The purpose of the opening is to ensure that the liquid level in the metering tube is always consistent with the blood level in the receiving cavity two.

[0011] Furthermore, to ensure that the central axis of the receiving cavity is perpendicular to the horizontal plane, the bottoms of both the thrombus filtering structure and the blood receiving structure are flat. The central axis of the thrombus filtering structure is perpendicular to the flat plane at its bottom, and the central axis of the blood receiving structure is perpendicular to the flat plane at its bottom. This design ensures that, during use, the thrombus filtering structure and the blood receiving structure can be combined and placed on a platform to guarantee effective thrombus aspiration and blood reinfusion.

[0012] Furthermore, to ensure effective cleaning of the filter membrane after it becomes clogged with thrombus, the thrombus filtration structure includes a separable portion. This separable portion detaches from the main body of the thrombus filtration structure, fully exposing the filter membrane for rapid rinsing. The separable portion and the main body of the thrombus filtration structure are sealed together to ensure no air or liquid leakage.

[0013] Technical effect By placing the thrombus filtration structure and the blood containment structure in different vertical spaces, and providing corresponding pathways for thrombus filtration and collection as well as blood reinfusion, it is ensured that the thrombus is effectively processed and reinfused. The filtration tubing includes an upper and lower inlet, and the connection between the upper inlet and the second connecting tubing of the blood containment structure ensures that the blood containing the thrombus enters the first containment chamber only passes through the filter membrane against gravity. During flushing, because the density of the thrombus is higher than that of the blood, the thrombus will settle downwards under gravity and enter the bottom of the first containment chamber, resulting in less thrombus adhering to the filter membrane and preventing clogging. The placement of the third containment chamber outlet near the top of the second containment chamber ensures that the second containment chamber collects sufficient blood and prevents blood from entering the negative pressure supply structure.

[0014] By ensuring the uniqueness of the lowest point of the receiving cavity and the fact that the lowest point of the filter tube is located at the lowest point of the receiving cavity, and that the lower opening of the filter tube is oriented away from the lowest point of the receiving cavity, it is guaranteed that the thrombus will first settle at the lowest point of the receiving cavity. Furthermore, the direction of blood flow during thrombus filtration will not cause significant fluctuations or interference to the thrombus deposited at the lowest point. Ultimately, this minimizes the risk of the thrombus passing through the filter membrane with the blood flow, further reducing the frequency of filter membrane clogging and ensuring that the entire operation is faster and more efficient.

[0015] By using a metering tube with an opening and a metering bulb with a diameter larger than that of the receiving cavity opening three, the opening ensures that the liquid level in the metering tube is always consistent with the blood level in the receiving cavity two, and that the metering bulb rises as the liquid level rises. When the blood in the receiving cavity two reaches the required volume, the floating metering bulb blocks the receiving cavity opening three. In this way, the blood collected in the receiving cavity two is quantified.

[0016] By setting up a separable part that is separate from the main body of the thrombus filtration structure, and combining them in a sealed manner, the filter membrane can be fully exposed after the main body and the separable part are separated, which facilitates cleaning of the filter membrane after it is blocked. Attached Figure Description

[0017] Figure 1 A schematic diagram of the cross-sectional structure of the device for the embodiment of combining a thrombus filtration structure and a blood-containing structure; Figure 2 A schematic diagram of the combined structure of the device and the suction tubing of the thrombus aspiration tube in an implementation method for the combination of the thrombus filtration structure and the blood containment structure. Figure 3 A schematic diagram of the combined structure of the device and the blood return tubing of the embodiment of the combination of the thrombus filtration structure and the blood containment structure; Figure 4 A schematic diagram of the cross-sectional structure of the device for extending the receiving cavity opening of the connecting pipe to the lowest point of the receiving cavity. Figure 5 A schematic diagram of the overall structure of the device for the implementation of a combination of a thrombus filtration structure and a blood-containing structure; Figure 6 A schematic diagram of the cross-sectional structure of an implementation device in which the thrombus filtration structure and the blood containment structure are integrated; Figure 7 A schematic diagram of the combined structure of the device and the blood-containing structure in an implementation method where the thrombus filtration structure and the blood-containing structure are integrated; Figure 8 A schematic diagram of the combined structure of the device and the blood return tubing, which integrates the thrombus filtration structure and the blood containment structure in an embodiment. Figure 9 A schematic diagram of the overall structure of the device for an implementation where the thrombus filtration structure and the blood containment structure are integrated; Figure 10 A schematic diagram of an embodiment in which the thrombus filtration structure and the blood containment structure are integrated and a separation part is provided, with the separation part being separated from the main body. Figure 11 A schematic diagram showing the implementation method of installing a three-way valve at the connection position of connecting pipe 1 and connecting pipe 4 and installing a one-way valve 5 at the edge of the filter pipe, and showing the direction of thrombus aspiration. Figure 12 A schematic diagram showing the blood flow direction is provided, illustrating an implementation method in which a three-way valve is installed at the connection point between connecting pipe 1 and connecting pipe 4, and a one-way valve 5 is installed at the edge of the filter pipe. Figure 13 A schematic diagram of an embodiment in which a filter membrane is attached to a movable block via a connecting strip; Figure 14 A partial magnified view of the connection point between the third connecting pipe and the quantitative tube, with the quantitative ball sealing the three-state cavity opening; Figure 15 This is a partially enlarged cross-sectional view of the connection point between the connecting pipe 3 and the metering tube.

[0018] Explanation of main figure symbols 1. Thrombus filtration structure; 11. Receptacle chamber one; 12. Connecting tubing one; 121. Suction port; 122. Receptacle opening one; 13. Filtration tubing; 131. Upper opening; 132. Lower opening; 133. Lower tubing; 1331. Lower tubing wall; 1332. Upper tubing wall; 1341. Filter membrane one; 13411. Movable block; 13412. Connecting strip; 1342. Filter membrane two; 135. Connecting section one; 141. Separable part; 142. Main body; 2. Blood containing structure; 21. Receptacle chamber two; 22. Connecting pipe two; 221. Receiving cavity two; 222. Connecting section two; 23. Connecting pipe three; 231. Receiving cavity three; 2311. Protruding ring; 232. Pressure connection port; 3. Thrombus aspiration tube; 31. Aspiration tube; 32. Blood reinfusion tube two; 41. Quantitative tube; 411. Longitudinal through-hole; 42. Quantitative bulb; 51. One-way valve one; 52. Switch valve; 53. One-way valve three; 54. One-way valve four; 55. Three-way valve; 6. Connecting pipe four; 71. Slide rail; 72. Protruding platform; 8. Shell. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0021] To keep the drawings concise, only the parts relevant to this application are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0022] In this document, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Example 1 refer to Figure 1-5 A thrombus filtration and reinfusion device includes a thrombus filtration structure 1, a blood containing structure 2, and a blood reinfusion line 1. It should be noted that the thrombus filtration and reinfusion device is connected to an existing thrombus aspiration tube 3. The thrombus aspiration tube 3 includes two parallel pathways: one is an aspiration line 31 for thrombus extraction, and the other is a blood reinfusion line 32 for blood reinfusion. This arrangement is to avoid the risk of thrombi remaining in the aspiration line 31 being pushed back into the body due to the aspiration and reinfusion using the same line.

[0024] The thrombus filtering structure 1 and the blood containing structure 2 are combined and connected. The thrombus filtering structure 1 and the blood containing structure 2 are two related and independent housings 8, and all structures are housed within the housings 8.

[0025] The thrombus filtration structure 1 includes a receiving cavity 11 for receiving blood containing thrombi; the thrombus filtration structure 1 also includes a connecting tube 12 and a filtering tube 13; one end of the connecting tube 12 extends into the receiving cavity 11, and the other end is connected to the suction tube 31; the connecting tube 12 includes a suction port 121 communicating with the thrombus suction tube 3 and a receiving cavity port 122 communicating with the receiving cavity 11; the filtering tube 13 is provided with a filter membrane and extends upward from the bottom of the receiving cavity 11 along the side wall of the receiving cavity 1; the filtering tube 13 includes an upper port 131 and a lower port 132.

[0026] The blood containing structure 2 includes a second containing cavity 21 for containing filtered blood; the blood containing structure 2 also includes a second connecting pipe 22 and a third connecting pipe 23. One end of the second connecting pipe 22 extends into the bottom of the second containing cavity 21, and the other end is connected to the upper opening 131 of the filtering pipe 13. The opening of the second connecting pipe 22 in the second containing cavity 21 is the second containing cavity opening 221; the third connecting pipe 23 includes a third containing cavity opening 231 connected to the containing cavity and a pressure connection port 232 connected to the pressure supply structure; the third containing cavity opening 231 is located near the top of the second containing cavity 21.

[0027] The blood reinfusion line includes a second connecting line 22 and a third connecting line 23 disposed within the second receiving cavity 21; during blood reinfusion, the second connecting line 22 is connected to the second blood reinfusion line 32 of the thrombus aspiration tube 3.

[0028] The thrombus filtering structure 1 and the blood containing structure 2 are set in different vertical spaces. The vertical space contains the first receiving cavity 11 and the second receiving cavity 21, which occupy independent vertical spaces. In use, the thrombus filtering structure 1 and the blood containing structure 2 form a connected space with good sealing except for the suction port 121 and the pressure connection port 232.

[0029] The suction port 121 of the connecting pipe 12 of the above structure is connected to the thrombus aspiration tube 3, and the pressure port 232 is connected to the positive or negative pressure supply structure. When blood needs to be drawn out for filtration, the pressure port 232 is connected to the negative pressure supply structure; when blood needs to be reinfused into the body, the pressure port 232 is connected to the positive pressure supply structure. During blood aspiration and filtration, the blood enters the receiving chamber 11 through the connecting pipe 12. When the blood level exceeds the lower opening 132 of the filtering pipe 13, the blood is filtered by the filter membrane of the filtering pipe 13 and then enters the receiving chamber 21 through the connecting pipe 22. The blood entering the receiving chamber 21 is blood that meets the requirements for clinical reinfusion. When the blood in the receiving chamber 21 reaches the blood volume scale for a single reinfusion, the negative pressure supply structure is changed to a positive pressure supply structure. During reverse reinfusion, the blood receiving structure 2 is connected to the thrombus aspiration tube 3 using the blood reinfusion pipe 1.

[0030] By setting the thrombus filtration structure 1 and the blood containing structure 2 in different vertical spaces, and by providing corresponding pathways for thrombus filtration and collection and blood reinfusion, it is possible to ensure that the thrombus is effectively treated and reinfused.

[0031] Further, refer to Figure 1 and Figure 4 The filter tube 13 includes an upper port 131 and a lower port 132, and a connecting tube 22 between the upper port 131 and the blood containing structure 2. The containing cavity 11 has only one lowest point. The lowest position of the lower port 132 of the filter tube 13 is higher than the lowest point of the containing cavity 1, and the opening of the lower port 132 faces away from the lowest point. This method can ensure that the thrombus settles down partially under the action of gravity and undergoes the first filtration. The orientation of the lower port 132 ensures that the blood flow of the aspirated blood will not drive the blood flow at the lowest point, thereby making the thrombus stably deposited at the lowest point. This minimizes the risk of the thrombus passing through the filter membrane with the blood flow, further reducing the frequency of filter membrane blockage and ensuring that the entire operation is faster and more efficient.

[0032] More specifically, the lower opening 132 of the filter tube 13 is configured such that the lower tube wall 1331 is longer than the upper tube wall 1332. This configuration ensures that the lower opening 132 faces away from the lowest point. The tube corresponding to the filter membrane 1341 from the lower opening 132 of the filter tube 13 is the lower tube 133. The lower tube 133 has a gradually decreasing diameter from the filter membrane to the lower opening 132, with the lower tube wall 1331 facing upwards and the upper tube wall 1332 facing downwards. This configuration ensures that while the lower opening 132 faces upwards, its vertical position is also as close as possible to the lowest point of the receiving cavity 11. This configuration ensures that the volume from the lowest point of the receiving cavity 11 to the lower opening 132 is small, thus preventing the filter membrane from becoming clogged and avoiding a large volume of blood waste.

[0033] Further, refer to Figure 4 The lowest point of the receiving cavity opening 122 of the connecting tube 1 coincides with the lowest point of the receiving cavity 11, allowing blood to flow through the connecting tube 12 to the bottom; or, refer to Figure 1-2 The cavity opening 122 is positioned facing and close to the side wall of the cavity 11, so that the blood flowing out through the cavity opening 122 flows downward along the side wall of the cavity 11. Both of these configurations ensure that the blood is flowing throughout the entire process of aspirating blood containing thrombus, without dripping, thus protecting the blood cells and ensuring their integrity, preventing damage to the blood cells due to dripping.

[0034] Further, refer to Figure 1 and Figure 4 The blood-containing structure 2 has only one lowest point in its receiving cavity 21. The lowest point of the receiving cavity opening of the connecting pipe 22 is either the same as or very close to the lowest point of the receiving cavity 21. This design ensures that blood flows into the receiving cavity 21 during aspiration without dripping. Furthermore, during blood reinfusion, all blood in the receiving cavity 21 is returned to the body, preventing blood waste.

[0035] Further, refer to Figure 1 , Figure 11 and Figure 12It also includes a metering tube 41, which extends from the receiving cavity opening 3 231 along the longitudinal axis of the connecting pipe 3 23 and toward the receiving cavity 2 21. A metering ball 42 is defined inside the metering tube 41 and does not leave the metering tube 41 and moves along the longitudinal axis of the metering tube 41. An opening communicating with the receiving cavity 2 21 is provided at the bottom of the metering tube 41 to ensure that the liquid level in the metering tube 41 is always consistent with the blood liquid level in the receiving cavity 2 21. Specifically, the lower end of the metering tube 41 is closed, and a longitudinal through-hole 411 communicating with the receiving cavity 21 is provided on the side wall of the metering tube 41; a metering ball 42 is installed inside the metering tube 41, and the diameter of the metering ball 42 is larger than the diameter of the receiving cavity opening 231; the blood level in the receiving cavity 21 causes the metering ball 42 to float upwards, and blood collection stops when the metering ball 42 blocks the receiving cavity opening 231. This setting eliminates the need for manual monitoring of the blood volume in the receiving cavity 21, as the receiving cavity opening 231 is sealed by the metering ball 42 when the specified liquid level is reached, making metering more convenient. Specifically, the metering tube 41 and the connecting tube 3 are integrally connected with the same diameter, and the diameter of the metering ball 42 is smaller than the diameter of the metering tube 41 to ensure effective buoyancy; combined with Figure 12 A protruding ring 2311 is provided at the position of the receiving cavity 3 231, so that the diameter of the receiving cavity 3 231 is smaller than the diameter of the metering ball 42. This specific arrangement can ensure that the metering is done by the floating metering ball 42 while simplifying the manufacturing process of the entire device.

[0036] Further, refer to Figure 1 The section of filter tubing 13 extending to the outside of the main body of thrombus filter structure 1 is called connecting section one 135; the section of connecting tubing two 22 extending to the outside of the main body of blood containing structure 2 is called connecting section two 222; fluid communication between thrombus filter structure 1 and blood containing structure 2 is achieved through the connection of connecting section one 135 and connecting section two 222; effective sealing connection can be achieved by rotating the pagoda head or screws or other connections. During blood reinfusion, connecting section two 222 is connected to blood reinfusion tubing two 32 of thrombus aspiration tube 3 to perform blood reinfusion.

[0037] Furthermore, to ensure the central axis of the receiving cavity is perpendicular to the horizontal plane, the bottoms of both the thrombus filtering structure 1 and the blood receiving structure 2 are flat. The central axis of the thrombus filtering structure 1 is perpendicular to the flat plane of its bottom, and the central axis of the blood receiving structure 2 is perpendicular to the flat plane of its bottom. This arrangement ensures that when the connected thrombus filtering structure 1 and blood receiving structure 2 are placed on a placement platform, their stable placement guarantees effective thrombus aspiration and blood reinfusion. More specifically, both the bottom planes of the thrombus filtering structure 1 and the blood receiving structure 2 are equipped with magnetic suction plates, and corresponding magnetic suction plates are also provided on the placement platform. Magnetic suction allows the thrombus filtering structure 1 and the blood receiving structure 2 to be stably placed on the placement platform (not shown in the figure). More specifically, the thrombus filtering structure 1 and the blood receiving structure 2 are identical rectangular or cubic structures for easy storage and placement.

[0038] Further, refer to Figure 1 The filter membrane is a double-layer filter membrane. One layer is filter membrane 1341 located near the lower opening 132, and the other layer is filter membrane 1342 located near the upper opening 131. The pore size of filter membrane 1342 is 200um. This pore size setting ensures that the blood entering the blood receiving cavity after filtration is safe for reinfusion into the human body.

[0039] When using the instrument, select an automated instrument that can provide both positive and negative pressure simultaneously, and refer to [reference needed]. Figure 2 and Figure 3 First, connect the filter tube 13 to the connecting tube 22 to combine the thrombus filtration structure 1 and the blood containing structure 2. After assembly, connect the connecting tube 12 to the suction tube 31 of the thrombus aspiration tube 3, and then connect the negative pressure supply structure to the connecting tube 23. After assembly, start the negative pressure. The blood containing the thrombus enters the containing chamber 11 along the tube. When the liquid level is higher than the lower opening 132 of the filter tube 13, the blood is filtered through the filter membrane of the filter tube 13 and then enters the containing chamber 21 through the connecting tube 22 for collection. As the filtered blood continues to enter the containing chamber 21, the liquid level rises, causing the metering bulb 42 to float continuously. Finally, the metering bulb 42 blocks the opening 231 of the containing chamber, completing one round of blood collection. Then, the thrombus filtration structure 1 is separated from the blood containing structure 2, and the connecting tube 22 is connected to the blood return line 32 of the thrombus aspiration tube 3; the negative pressure is switched to positive pressure, and the positive pressure is used to push the blood in the containing chamber 21 back into the human body. The amount of blood collected in a single round is controlled at 30-50 mm. This volume range can ensure that the amount of blood loss in the human body is not too large, and ultimately avoid excessive blood loss in the patient.

[0040] Example 2 refer to Figure 6-10Based on Example 1, the following improvement is made: the thrombus filtering structure 1 and the blood containing structure 2 are integrally connected. The thrombus filtering structure 1 and the blood containing structure 2 are integrated into a single housing 8, and all structures are housed within the housing 8.

[0041] In addition to connecting pipes 22 and 23 disposed in the receiving cavity 21, the blood reinfusion line also includes connecting pipe 6, which is used to communicate with the thrombus aspiration tube 3. When the blood filtration structure 1 is connected to the blood receiving structure 2, connecting pipe 22 is also used to communicate with the thrombus aspiration tube 3.

[0042] The filter pipe 13 is integrally connected to the connecting pipe 22. The first end of the connecting pipe 4 6 is connected to the connecting pipe 22, and the second end of the connecting pipe 4 6 is connected to the connecting pipe 12. The connection position is outside the receiving cavity 11.

[0043] refer to Figures 6-8 By setting multiple one-way valves and on / off valves at different locations, the valve switching process during blood aspiration and blood reinfusion can be reduced. The first method is as follows: a one-way valve, namely one-way valve 51, is set in the connecting pipe 6 near the connection position of connecting pipe 4 6 and connecting pipe 1 12. An on / off valve 52 is set in the connecting pipe 1 12 near the connection position of connecting pipe 4 6 and connecting pipe 1 12. Along the blood flow direction, the on / off valve 52 is located downstream of one-way valve 51. One-way valve 51 opens in the direction of blood reinfusion. A one-way valve 53 is set in the filter pipe 13 near the connection position of connecting pipe 4 6 and connecting pipe 2 22. One-way valve 54 opens in the direction of receiving chamber 2 21. In this way, the switching between aspiration and reinfusion lines can be completed by switching the connector position of the thrombus aspiration tube 3, switching the positive and negative pressure conditions of the positive and negative pressure supply structure, and adjusting the opening and closing state of the switch valve 52. The switch valve 52 is closed when blood is reinfused and opened when blood is aspirated.

[0044] Alternatively, another implementation method can be adopted, which involves a valve body and a check valve within the pipe, as described in the following reference. Figure 11 and Figure 12A steerable valve structure or two openable valves are installed at the connection point between connecting pipe 4 (6) and connecting pipe 1 (12). Specifically, connecting pipe 4 (6) and connecting pipe 12 are connected vertically in a three-way configuration. A three-way valve 55 is installed at the three-way vertical connection point, allowing the switching between the aspiration and reinfusion paths through rotation in different directions. Correspondingly, a one-way valve 54 allowing aspiration is installed at the upper opening of the filter pipe 13. In specific operation, the switching between the aspiration and reinfusion pipelines is completed by switching the connector position of the thrombus aspiration tube 3, switching the positive and negative pressure conditions of the positive and negative pressure supply structure, and adjusting the position of the three-way valve 56. Blood aspiration is performed by closing the opening of connecting pipe 4 (6) and connecting pipe 1 (12) through the three-way valve 56, and blood reinfusion is performed by opening connecting pipe 4 (6) and closing connecting pipe 1 (12) through the three-way valve 56.

[0045] Further, refer to Figure 10 To ensure effective cleaning of the filter membrane after it becomes clogged by thrombus, the thrombus filter structure 1 includes a separable portion 141. This separable portion separates from the main body 142 of the thrombus filter structure 1, fully exposing the filter membrane for rapid rinsing. The separable portion and the thrombus filter structure 1 are sealed together to prevent air or liquid leakage. The separable portion 141 and the main body 142 are respectively provided with a sliding track 71 and a protrusion 72 within the sliding track 71. Other combinations of the separable portion and the main body, such as rotation and locking, can also be selected. Alternatively, the filter membrane can be designed as a membrane structure detached from the filter tube for easier processing; in this case, the separable portion can be made slightly smaller. This implementation method can also be used in the embodiments, where it is only located at the housing 8 corresponding to the thrombus filter structure 1.

[0046] Alternatively, an alternative cleaning or replacement method for the filter membrane can be implemented to ensure its effectiveness. (Reference) Figure 11 and Figure 12 A filter membrane 1341 is fitted inside the filter pipe 13. A movable block is provided below the receiving cavity 11. Moving the movable block 13411 exposes the filter membrane 1341, allowing it to be cleaned or replaced. After cleaning the filter membrane 1341, the movable block 13411 is moved again to close the receiving cavity 11. (Reference) Figure 15The filter membrane includes a conical membrane structure. A connecting strip 13412 is provided on the opposite side of the conical membrane structure. The connecting strip 13412 is connected to a movable block 13411. By moving the movable block 13411, the filter membrane can be placed into the filter tube 13 or removed from the filter tube 13 for cleaning. The distance between the filter membrane 1341 and the bottom of the receiving cavity 11 is greater than or equal to 1 cm. This arrangement can effectively utilize gravity sedimentation to prevent blood flow from carrying thrombi away from the bottom and reduce the filtration pressure of the filter membrane.

[0047] When using the instrument, refer to Figure 7 and Figure 8 First, connect the connecting pipe 12 to the suction pipe 31 of the thrombus aspiration pipe 3. Then, connect the negative pressure supply structure to the connecting pipe 23. The negative pressure supply structure can be an electric suction pump or a manual suction syringe. Depending on the setting of different valve bodies and check valves, control the direction of the three-way valve 56 or the opening and closing state of the switch valve 52 according to the suction situation to perform blood aspiration operation. After setting, start the negative pressure of the negative pressure supply structure. In this way, the blood containing thrombus enters the receiving chamber 11 along the pipe. When the liquid level is higher than the lower opening 132 of the filter pipe 13, the blood is filtered through the filter membrane of the filter pipe 13 and enters the receiving chamber 21 through the connecting pipe 22 for collection. As the filtered blood continues to enter the receiving chamber 21, the liquid level rises and drives the metering device to float up. Finally, the metering ball 42 seals the opening 231 of the receiving chamber, completing one round of blood collection. Then, adjust the direction of the three-way valve 56 or control the opening and closing state of the switch valve 52 to ensure that the blood return operation can be performed. Adjust the connection between the connecting line 12 and the blood return line 32 of the thrombus aspiration tube 3, and replace the negative pressure supply structure with a positive pressure supply structure. Use positive pressure to push the blood in the receiving chamber 21 back into the human body. The amount of blood collected in a single round is controlled at 30-50 mm. This volume range can ensure that the amount of blood loss in the human body is not too large, and ultimately avoid excessive blood loss in the patient.

[0048] The above description is merely a specific embodiment of this application. Under the guidance of the above teachings, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this application, and the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A thrombus filtration and reinfusion device, characterized in that, It includes, A thrombus filtration structure includes a receiving cavity, a connecting tube, and a filtering tube. The receiving cavity is used to receive blood containing thrombi. A first end of the connecting tube extends into the receiving cavity, and a second end is connected to a thrombus aspiration tube. The connecting tube includes an aspiration port communicating with the thrombus aspiration tube and a receiving cavity opening communicating with the receiving cavity. A filtering membrane is provided inside the filtering tube, and the filtering tube extends upward from the bottom of the receiving cavity along the side wall of the receiving cavity. The filtering tube includes an upper opening and a lower opening. The blood containing structure includes a second containing cavity for containing filtered blood; the blood containing structure also includes a second connecting pipe and a third connecting pipe, one end of the second connecting pipe extending into the bottom of the second containing cavity, and the other end communicating with the upper opening of the filtering pipe, the opening of the second connecting pipe in the second containing cavity being the second containing cavity opening; the third connecting pipe includes a third containing cavity opening communicating with the containing cavity and a pressure connection port communicating with the pressure supply structure; the third containing cavity opening is located near the top of the second containing cavity. The blood reinfusion line one includes at least the connecting line two and the connecting line three disposed in the receiving cavity two; when the thrombus filtration structure is integrally connected with the blood receiving structure, the blood reinfusion line one further includes the connecting line four, which is used to communicate with the thrombus aspiration tube; when the thrombus filtration structure is combined with the blood receiving structure, the connecting line two is also used to communicate with the thrombus aspiration tube; The thrombus filtration structure and the blood containing structure are located in different vertical spaces, and the first and second containing cavities occupy independent vertical spaces.

2. The device according to claim 1, characterized in that, The first receiving cavity contains only one lowest point, the lowest position of the lower opening of the filter pipe is higher than the lowest point of the first receiving cavity, and the opening of the lower opening faces away from the lowest point.

3. The device according to claim 2, characterized in that, The lower opening of the filter pipe has a longer lower wall than the upper wall. The pipe from the lower opening to the filter membrane is called the lower pipe. The lower pipe has a gradually decreasing diameter from the filter membrane end to the lower opening end. In cross-section, the lower pipe wall path faces upward and the upper pipe wall path faces downward.

4. The device according to claim 1, characterized in that, The lowest point of the receiving cavity opening of the connecting pipe is consistent with the lowest point of the receiving cavity, so that blood flows through the connecting pipe to the bottom; or, the receiving cavity opening is oriented towards and close to the side wall of the receiving cavity, so that the blood flowing out through the receiving cavity opening flows downward along the side wall of the receiving cavity.

5. The device according to claim 1, characterized in that, The second receiving cavity of the blood receiving structure contains only one lowest point, and the lowest point of the receiving cavity opening of the second connecting pipe is consistent with or infinitely close to the lowest point of the second receiving cavity.

6. The device according to claim 1, characterized in that, A metering tube extends from the third receiving cavity opening along the longitudinal axis of the connecting pipe third towards the second receiving cavity. A metering ball, which remains within the metering tube and moves along its longitudinal axis, is defined within the metering tube. An opening communicating with the second receiving cavity is provided at the bottom of the metering tube. The diameter of the metering ball is larger than the diameter of the third receiving cavity opening. This causes the blood level in the second receiving cavity to cause the metering ball to float upwards. Blood collection stops when the metering ball blocks the third receiving cavity opening. Preferably, the metering tube and the connecting tube are integrally connected and have the same diameter, the diameter of the metering ball is smaller than that of the metering tube, and a protruding ring is provided at the position of the receiving cavity opening three, so that the diameter of the receiving cavity opening three is smaller than the diameter of the metering ball.

7. The device according to claim 1, characterized in that, The thrombus filtration structure is combined and connected with the blood-containing structure. The section of the filter pipe extending to the outside of the main body of the thrombus filtration structure is called the first connection section; the section of the second connection pipe extending to the outside of the main body of the blood-containing structure is called the second connection section. The combination of the first connection section and the second connection section realizes the combination of the thrombus filtration structure and the blood-containing structure. The two are combined in a way that can be effectively sealed by rotating the pagoda head or screws or other combinations.

8. The device according to claim 1, characterized in that, The thrombus filtration structure is integrally connected to the blood containing structure, the filtration pipeline is integrally connected to the second connecting pipeline, the first end of the fourth connecting pipeline is connected to the second connecting pipeline, the second end of the fourth connecting pipeline is connected to the first connecting pipeline, and the connection position is outside the containing cavity one; A one-way valve, designated as one-way valve one, is installed in the connecting pipe four near the connection point of the connecting pipe one. The one-way valve one opens in the direction of blood return. A switch valve is installed in the connecting pipe one near the connection point of the connecting pipe four and the connecting pipe one. A one-way valve three is installed in each of the filter pipes near the connection point of the connecting pipe four and the connecting pipe two. The one-way valve three opens in the direction of the receiving cavity two. Alternatively, the connecting pipe four and the connecting pipeline are connected in a three-way vertical connection. A three-way valve is set at the three-way vertical connection point, and the suction path and return path are switched by rotation in different directions. A one-way valve five that allows suction is set at the upper opening of the filter pipeline.

9. The device according to claim 1, characterized in that, The bottom of both the thrombus filtration structure and the blood-containing structure are flat. The central axis of the thrombus filtration structure is perpendicular to the plane at the bottom of the thrombus filtration structure, and the central axis of the blood-containing structure is perpendicular to the plane at the bottom of the blood-containing structure. Preferably, the bottom planes of the thrombus filtering structure and the blood containing structure are provided with magnetic attracting pieces, namely a lower magnetic attracting piece and an upper magnetic attracting piece, and the bottom of the lower magnetic attracting piece is provided with an adhesive layer, which is then attached to the placement platform during use; preferably, the thrombus filtering structure and the blood containing structure are cuboid or cube structures with the same shape.

10. The device according to claim 1, characterized in that, The thrombus filtration structure includes a separable portion that separates from the main body of the thrombus filtration structure to fully expose the filter membrane; preferably, the separable portion is provided with a sliding track corresponding to the main body, and a protrusion provided in the sliding track; preferably, the filter membrane is configured as a membrane structure that separates from the filter tube; Alternatively, the filter membrane is fitted inside the filter pipe, and a movable block is provided below the receiving cavity. Moving the movable block exposes the filter membrane, allowing it to be cleaned or replaced. Moving the movable block again closes the receiving cavity. Preferably, the filter membrane includes a conical membrane structure with a connecting strip on the opposite side. The connecting strip is connected to the movable block, allowing the filter membrane to be placed inside or removed from the filter pipe by moving the movable block.

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