Vein pot blood recovery device and blood purification system

Abstract

The utility model discloses a vein pot blood recovery device and a blood purification system, which are applied to the field of blood purification, and comprise an end cover, an upper cover and a lower cover, a blood inlet member; a blood outlet member; the first end of the recovery pipeline is installed on the shell and extends into the shell, and a port of the first end of the recovery pipeline faces and is close to the end cover, so that when the shell is inverted and extruded, blood in the shell is extruded out of the port of the first end of the recovery pipeline; the second end of the recovery pipeline is connected with the blood outlet component, and one of the recovery pipeline and the shell is communicated with the blood outlet component; when the end cover rotates to the filtering position, the blood inlet component is separated from the recycling pipeline, and when the end cover rotates to the recycling position, the blood inlet component is communicated with the recycling pipeline. According to the recovery device provided by the utility model, the residual blood in the blood circulation loop and the dialyzer can be transfused back into the body of a patient, and the blood in the venous kettle can be transfused back after the blood in the venous kettle is coagulated.

Description

Technical Field

[0001] The utility model relates to the field of blood purification, in particular to a venous pot blood recovery device and a blood purification system. Background Art

[0002] Coagulation is a common clinical event during hemodialysis. When coagulation occurs in the venous cannula, dialysis treatment cannot continue and the patient is forced to get off the machine. The blood in the blood circulation circuit and the dialyzer (or filter) can only be discarded, resulting in a waste of blood and causing hypotension and inadequate dialysis in some patients.

[0003] In the related art, in order to prevent the blood clot from blocking the blood outlet in the venous pot, a first filter and a second filter are often set up. When the blood coagulation in the venous pot reaches a certain level, the first filter is self-damaged, and then the dialysis treatment is continued through the filtering function of the second filter. However, in the related art, when a large blood clot is formed in the venous pot, the patient will still be forced to get off the machine and blood will be wasted.

[0004] In addition, in the related art, there is a method of connecting multiple venous bottles in parallel in the blood circulation circuit, aiming to avoid the problem that the patient is forced to leave the dialysis machine and waste blood during the dialysis process after blood coagulation occurs in a venous bottle. However, this method cannot return the blood in the coagulated venous bottle to the patient's body, which will also cause blood waste.

[0005] Therefore, how to solve the problem that after the blood in the venous bottle is coagulated, the blood cannot be returned to the patient's body, resulting in blood waste, is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0006] The utility model aims to provide a venous pot blood recovery device and a blood purification system, which can ensure that the venous pot can return blood to the patient's body after blood coagulation, thereby avoiding blood waste.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A venous blood recovery device, comprising:

[0009] An end cap is rotatably mounted on the housing of the intravenous pot;

[0010] A blood inlet component is connected to the blood circulation circuit and is disposed through the end cover to allow blood to enter the housing;

[0011] A blood outlet component is connected to the blood circulation circuit and is installed at the bottom of the housing to allow the blood in the housing to flow out of the housing;

[0012] A recovery pipeline, the first end of which is mounted on the shell and extends into the interior of the shell, the first end of which faces and is close to the end cap, so that when the shell is inverted and squeezed, the blood in the shell is squeezed out from the first end of the recovery pipeline; the second end of the recovery pipeline is connected to the blood outlet component, and either the recovery pipeline or the shell is in conduction with the blood outlet component;

[0013] Furthermore, when the end cover is rotated to the filtering position, the blood inlet component is separated from the recovery pipeline, and when the end cover is rotated to the recovery position, the blood inlet component is connected to the recovery pipeline.

[0014] On the other hand, it also includes a recovery pipeline filter component, which is installed on one side of the recovery pipeline close to the blood outlet component.

[0015] On the other hand, it also includes a sealing component, which is located between the shell and the end cover. A mounting groove is provided on one side of the end cover and / or the shell that is close to each other, and the sealing component is placed in the mounting groove.

[0016] On the other hand, the mounting groove is annular and surrounds the circumference of the end cover and / or the shell, and the sealing component is a silicone ring or a rubber ring.

[0017] On the other hand, it also includes a first hemostatic component, which is installed on the blood outlet component to open or close the blood outlet component; it also includes a second hemostatic component, which is installed on the recovery pipeline to open or close the recovery pipeline; and, either the first hemostatic component or the second hemostatic component is opened selectively.

[0018] On the other hand, the recovery pipeline includes a pipeline body and a transition component, one end of the transition component is connected to the pipeline body, and the other end of the transition component constitutes a first end port of the recovery pipeline. The transition component can be connected to or separated from the blood inlet component.

[0019] On the other hand, the adapter component is fixed on the shell, and the adapter component is corner-shaped, with one end located inside the shell and the other end extending to the outside of the shell, and the pipeline body is detachably connected to the adapter component.

[0020] On the other hand, a first sealing layer is provided at the bottom of the blood inlet component, and a second sealing layer is provided at the top of the transition component. The first sealing layer and the second sealing layer are both elastic layers. When the positions of the blood inlet component and the transition component correspond, the first sealing layer abuts against the second sealing layer.

[0021] On the other hand, the shell is provided with a first limit member and a second limit member at circumferential intervals, and the periphery of the end cover is provided with a third limit member. When the end cover is rotated to the filtering position, the third limit member is limit-engaged with the first limit member, and when the end cover is rotated to the recovery position, the third limit member is limit-engaged with the second limit member.

[0022] The utility model also provides a blood purification system, comprising any one of the venous pot blood recovery devices described above.

[0023] The venous pot blood recovery device provided by the utility model is that when the venous pot is in normal use, that is, when the venous pot is in a filtering state, the end cover is located at the filtering position, and blood enters the inner cavity of the shell through the blood inlet component, and after being filtered by the venous pot, it flows out through the blood outlet component. The blood inlet component, the shell and the blood outlet component are connected in the blood circulation loop to filter the blood and prevent thrombus from entering the body. When a large thrombus is formed in the venous pot, since the blood in the shell cannot continue to flow out through the blood outlet component, the blood is reinfused by inverting the shell. Due to the setting of the recovery pipeline, the first end port of the recovery pipeline is facing and close to The end cap, after the shell is inverted, the blood in the shell immerses the first end port of the recovery pipeline, and by squeezing the shell, the blood in the shell is squeezed out from the first end port of the recovery pipeline. Since the second end of the recovery pipeline is connected to the blood outlet component, after squeezing the shell, the blood in the shell flows into the blood outlet component through the recovery pipeline; then the end cap rotates to the recovery position, at which time the blood inlet component is connected to the recovery pipeline, and the blood pump of the dialyzer is continuously started, and the blood in the extracorporeal circulation system continues to flow along the circulation pipeline. At this time, no more blood enters the shell, and the blood in the shell flows back to the body through the recovery pipeline and the blood outlet component, thereby avoiding blood waste. The venous pot blood recovery device, through the rotation setting of the end cap, drives the position of the blood inlet component to change, and cooperates with the first end port of the recovery pipeline, so that the blood in the venous pot can be returned to the patient's body after the venous pot is coagulated, and at the same time, the blood remaining in the blood circulation circuit and the dialyzer can be returned to the patient's body, and the blood can be returned after the venous pot is coagulated.

[0024] The blood purification system provided by the utility model is provided with the above-mentioned venous pot blood recovery device. Since the above-mentioned venous pot blood recovery device has the above-mentioned technical effects, the blood purification system provided with the venous pot blood recovery device should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a specific implementation of the intravenous blood recovery device provided by the utility model;

[0027] Figure 2 for Figure 1 The structure diagram of the venous blood recovery device shown is when the blood inlet component is connected to the recovery pipeline;

[0028] Figure 3 for Figure 1 A top view comparison diagram of the end cover and the housing of the venous blood recovery device when the end cover is in the filtering position;

[0029] Figure 4 for Figure 1 A top view comparison diagram of the end cover and the shell of the venous blood recovery device when the end cover is in the recovery position.

[0030] Reference numerals:

[0031] End cap 1; blood inlet component 2; first sealing layer 21; blood outlet component 3; recovery pipeline 4; pipeline body 41; adapter component 42; second sealing layer 421; recovery pipeline filter component 5; sealing component 6; mounting groove 7; first hemostasis component 8; second hemostasis component 9; shell 10; filter screen 11; bypass branch 12; first limiter 13; second limiter 14; third limiter 15. DETAILED DESCRIPTION

[0032] The core of the utility model is to provide a venous pot blood recovery device and a blood purification system, which can avoid the problem that after the venous pot has coagulated, the blood in the venous pot cannot be returned to the body, causing blood waste.

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The dialysis machine is a medical device used to treat patients with renal failure. It removes waste and excess water from the blood by simulating the function of the kidneys. During the dialysis process, the patient's blood will exchange substances with the dialysate through the extracorporeal circulation system to purify the blood; the intravenous pot is an important component of the extracorporeal circulation system. It is located in the blood circulation loop and is mainly used to capture the air in the blood circulation loop. A filter is set inside to intercept large blood clots, which can ensure the safety and effectiveness of the hemodialysis process.

[0035] Please refer to Figures 1 to 4 , Figure 1 A schematic structural diagram of a specific implementation of the intravenous blood recovery device provided by the utility model; Figure 2 for Figure 1 The structure diagram of the venous blood recovery device shown is when the blood inlet component is connected to the recovery pipeline; Figure 3 for Figure 1 A top view comparison diagram of the end cover and the housing of the venous blood recovery device when the end cover is in the filtering position; Figure 4 for Figure 1 A top view comparison diagram of the end cover and the shell of the venous blood recovery device when the end cover is in the recovery position.

[0036] In this embodiment, the intravenous blood recovery device comprises:

[0037] The end cover 1 is rotatably mounted on the housing 10 of the intravenous pot;

[0038] The blood inlet component 2 is connected to the blood circulation circuit and is disposed through the end cover 1 to allow blood to enter the housing 10;

[0039] The blood outlet component 3 is connected to the blood circulation circuit and installed at the bottom of the housing 10 to allow the blood in the housing 10 to flow out of the housing 10;

[0040] The recovery pipeline 4 has a first end mounted on the housing 10 and extending into the interior of the housing 10, and the first end of the recovery pipeline 4 faces and is close to the end cap 1, so that when the housing 10 is inverted and squeezed, the blood in the housing 10 is squeezed out from the first end of the recovery pipeline 4; the second end of the recovery pipeline 4 is connected to the blood outlet component 3, and either the recovery pipeline 4 or the housing 10 is in conduction with the blood outlet component 3;

[0041] Furthermore, when the end cover 1 is rotated to the filtering position, the blood inlet component 2 is separated from the recovery pipeline 4, and when the end cover 1 is rotated to the recovery position, the blood inlet component 2 is connected to the recovery pipeline 4.

[0042] Specifically, the intravenous kettle includes a shell 10, one end of which is connected to the end cover 1, and the end cover 1 is provided with a blood inlet component 2 and a bypass branch 12, for example, one blood inlet component 12 and two bypass branches 12, the bypass branch 12 can be connected to a dialysis machine for pressure monitoring, and can also be connected to a syringe for adding an anticoagulant; the blood inlet component 2 and the blood outlet component 3 are both tubular; a filter screen 11 is provided in the shell 10, and the filter screen 11 is engaged with the bottom of the shell 10 of the intravenous kettle to filter out blood clots appearing during the dialysis process; the other end of the shell 10 is connected to the blood outlet component 3, so that the filtered blood can flow out of the shell 10; when the intravenous kettle is in normal use, that is, when the intravenous kettle is in a filtering state, the end cover 1 is located in the filtering position, refer to Figure 3 , blood enters the inner cavity of the housing 10 through the blood inlet component 2, and after being filtered by the filter 11, flows out through the blood outlet component 3. The blood inlet component 2, the housing 10 and the blood outlet component 3 are connected in a blood circulation loop to filter the blood and prevent blood clots from entering the body. However, when blood coagulation produces a large blood clot, the large blood clot will block the filter 11, causing the blood in the housing 10 to be unable to flow out through the blood outlet component 3.

[0043] When a large thrombus is formed in the intravenous pot, the blood in the shell 10 cannot continue to flow out through the blood outlet component 3. Therefore, blood transfusion is achieved by inverting the shell 10. Due to the setting of the recovery pipeline 4, and the first end port of the recovery pipeline 4 is facing and close to the end cover 1, after the shell 10 is inverted, the blood in the shell 10 is immersed in the first end port of the recovery pipeline 4. By squeezing the shell 10, the blood in the shell 10 is squeezed out from the first end port of the recovery pipeline 4. Since the second end of the recovery pipeline 4 is connected to the blood outlet component 3, after squeezing the shell 10, the blood in the shell 10 flows into the blood outlet component 3 through the recovery pipeline 4; then the end cover 1 is rotated to the recovery position, refer to Figure 4 At this time, the blood inlet component 2 is connected to the recovery pipeline 4, and the blood pump of the dialysis machine continues to be started, so that the blood in the blood circulation loop and the dialyzer continues to flow along the circulation pipeline. At this time, no blood enters the shell 10, and the blood in the shell 10 flows back to the body through the recovery pipeline 4 and the blood outlet component 3, avoiding the waste of blood.

[0044] In some embodiments, a recovery pipeline filter component 5 is further included, and the recovery pipeline filter component 5 is installed in the recovery pipeline 4 on a side close to the blood outlet component 3. Specifically, a tee is provided on the blood outlet component 3, and is connected to the recovery pipeline 4 through the tee, which is convenient for assembly. The tee can be a T-shaped tee; the recovery pipeline filter component 5 is installed in the recovery pipeline 4 and close to a side of the blood outlet component 3, in order to ensure that the blood in the housing 10 is filtered and then transported back into the body.

[0045] In some embodiments, a sealing component 6 is further included, and the sealing component 6 is located between the housing 10 and the end cap 1. A mounting groove 7 is provided on the end cap 1 and / or the housing 10 on one side close to each other, and the sealing component 6 is placed in the mounting groove 7. Specifically, the end cap 1 and the housing 10 are connected by the sealing component 6, which can ensure that the end cap 1 still maintains the sealing effect in the housing 10 during the rotation process, avoids blood leakage, ensures sealing, and meets the needs of other functional tests.

[0046] In some embodiments, the mounting groove 7 is annular and surrounds the circumference of the end cover 1 and / or the housing 10, and the sealing component 6 is a silicone ring or a rubber ring. Specifically, the mounting groove 7 can be provided on both the end cover 1 and the housing 10, and the sealing ring is just engaged in the mounting groove 7 of the end cover 1 and the housing 10, which is more firm and has good stability.

[0047] In some embodiments, a first hemostatic component 8 is further included. The first hemostatic component 8 is installed on the blood outlet component 3 to open or close the blood outlet component 3. The first hemostatic component 8 can be a hemostatic clamp, which is clamped on the blood outlet component 3 to achieve the purpose of blocking the blood outlet component 3.

[0048] In some embodiments, a second hemostatic component 9 is further included, and the second hemostatic component 9 is installed on the recovery pipeline 4 to open or close the recovery pipeline 4; and the first hemostatic component 8 and the second hemostatic component 9 are selectively opened. Similarly, the second hemostatic component 9 can be a hemostatic clamp, which is clamped on the recovery pipeline 4 to achieve the purpose of blocking the blood outlet component 3; the blood outlet component 3 and the recovery pipeline 4 are preferably soft tubes for easy clamping; the first hemostatic component 8 and the second hemostatic component 9 are selectively opened, that is, the states of the first hemostatic component 8 and the second hemostatic component 9 are always different, ensuring the smooth progress of the two tasks of recovery and filtration.

[0049] In some embodiments, the recovery pipeline 4 includes a pipeline body 41 and a transition component 42, one end of the transition component 42 is connected to the pipeline body 41, and the other end of the transition component 42 constitutes a first end port of the recovery pipeline 4, and the transition component 42 can be connected to or separated from the blood inlet component 2. Specifically, the transition component 42 can be a plastic part, and the hardness of the transition component 42 is greater than the hardness of the pipeline body 41. By setting the transition component 42, the firmness and sealing of the connection between the transition component 42 and the blood inlet component 2 can be ensured.

[0050] In some embodiments, the adapter component 42 is fixed on the housing 10. The adapter component 42 is in an angle shape, which can be a right angle for easy processing. One end of the adapter component 42 is located inside the housing 10, and the other end extends to the outside of the housing 10. The pipeline body 41 and the adapter component 42 are detachably connected, which is convenient for the replacement of the pipeline body 41. The adapter component 42 is fixedly installed on the housing 10 to ensure the connection strength. For example, the adapter component 42 and the housing 10 can be integrally molded to ensure the position accuracy and stability of the adapter component 42. At the same time, in order to ensure that the blood in the housing 10 can be recovered as much as possible, the inlet of the adapter component 42 can be as close to the position of the end cap 1 as possible, that is, the length of the blood inlet component 2 extending out of the end cap 1 can be as small as possible, so as to ensure that after the housing 10 is inverted, the blood in the housing 10 can be squeezed out into the pipeline body 41 as much as possible through the adapter component 42.

[0051] In some embodiments, a first sealing layer 21 is provided at the bottom of the blood inlet component 2, and a second sealing layer 421 is provided at the top of the adapter component 42. The first sealing layer 21 and the second sealing layer 421 are both elastic layers. When the positions of the blood inlet component 2 and the adapter component 42 correspond, the first sealing layer 21 and the second sealing layer 421 abut against each other. Specifically, the axis of the blood inlet component 2 is preferably consistent with the axis of one end of the adapter component 42 close to the end cover 1, and the inner diameter of the blood inlet component 2 should be smaller than the outer diameter of one end of the adapter component 42 close to the end cover 1, to ensure that the blood can smoothly pass through the blood inlet component 2 into the recovery pipeline 4; further, in order to ensure the conduction effect between the blood inlet component 2 and the adapter component 42, the blood inlet component 2 is preferably a plastic part, or other parts with a certain hardness; the first sealing layer 21 or the second sealing layer 421 can be a rubber layer or a silicone layer, and the sum of the thickness of the first sealing layer 21 and the second sealing layer 421 can be slightly larger than the distance between the blood inlet component 2 and the adapter component 42. When rotating the end cover 1, it is necessary to apply a certain force to squeeze the first sealing layer 21 and the second sealing layer 421 to cause a certain elastic deformation, thereby achieving a reliable sealed connection.

[0052] In some embodiments, the first stopper 13 and the second stopper 14 are arranged at intervals in the circumferential direction of the housing 10, and the third stopper 15 is arranged on the periphery of the end cover 1. When the end cover 1 is rotated to the filtering position, the third stopper 15 is engaged with the first stopper 13 in a limited manner, and when the end cover 1 is rotated to the recovery position, the third stopper 15 is engaged with the second stopper 14 in a limited manner. Specifically, the first stopper 13, the second stopper 14 and the third stopper 15 can all be bosses. By setting the first stopper 13, the second stopper 14 and the third stopper 15, the rotation accuracy of the end cover 1 can be ensured, and there is no need to manually judge the rotation position of the end cover 1, which is convenient for operation and improves efficiency.

[0053] Specifically, when the venous blood recovery device is used, when the patient is undergoing normal dialysis, the end cap 1 of the venous blood recovery device is in the filtering position. Figure 1 and Figure 3 As shown, when the venous pot is coagulated, the blood pump on the dialysis machine is turned off, the first hemostatic component 8 is turned off, the venous pot is inverted, the second hemostatic component 9 is opened, and the venous pot is squeezed to make the blood flow along the recovery line 4, through the recovery line filter component 5 and the three-way piece into the blood outlet component 3. After the blood in the venous pot is drained, the end cover 1 is rotated to make the central axis of the blood inlet component 2 coincide with the central axis of the port of the adapter component 42, as shown in FIG. Figure 2 and Figure 4 As shown, the blood pump is turned on to recover the blood in the blood circulation circuit and the dialyzer.

[0054] The venous pot blood recovery device provided by the utility model drives the position of the blood inlet component 2 to change through the rotation setting of the end cover 1, and cooperates with the first end port of the recovery pipeline 4, so that the blood in the venous pot can be returned to the patient's body after the venous pot is coagulated. At the same time, the blood remaining in the blood circulation loop and the dialyzer can be returned to the patient's body, and the blood can be returned after the venous pot is coagulated.

[0055] In addition to the above-mentioned venous pot blood recovery device, the utility model also provides a blood purification system including the above-mentioned venous pot blood recovery device. Please refer to the prior art for the structure of other parts of the blood purification system, which will not be described in detail herein.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The above is a detailed introduction to the intravenous blood recovery device provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A venous blood recovery device, characterized in that: include: An end cover (1) is rotatably mounted on a housing (10) of the intravenous pot; A blood inlet component (2) connected to the blood circulation circuit and arranged through the end cover (1) to allow blood to enter the housing (10); A blood outlet component (3) connected to the blood circulation circuit and mounted at the bottom of the shell (10) to allow blood in the shell (10) to flow out of the shell (10); A recovery pipeline (4), the first end of which is mounted on the housing (10) and extends into the interior of the housing (10), the first end of the recovery pipeline (4) facing and close to the end cover (1), so that when the housing (10) is inverted and squeezed, the blood in the housing (10) is squeezed out from the first end of the recovery pipeline (4); the second end of the recovery pipeline (4) is connected to the blood outlet component (3), and either the recovery pipeline (4) or the housing (10) is in conduction with the blood outlet component (3); Furthermore, when the end cover (1) is rotated to the filtering position, the blood inlet component (2) is separated from the recovery pipeline (4); and when the end cover (1) is rotated to the recovery position, the blood inlet component (2) is connected to the recovery pipeline (4).

2. The venous blood recovery device according to claim 1, characterized in that: It also comprises a recovery pipeline filter component (5), wherein the recovery pipeline filter component (5) is installed on a side of the recovery pipeline (4) close to the blood outlet component (3).

3. The venous blood recovery device according to claim 1, characterized in that: It also comprises a sealing component (6), the sealing component (6) being located between the shell (10) and the end cover (1), a mounting groove (7) being provided on one side of the end cover (1) and / or the shell (10) close to each other, and the sealing component (6) being placed in the mounting groove (7).

4. The venous blood recovery device according to claim 3, characterized in that: The mounting groove (7) is annular and surrounds the circumference of the end cover (1) and / or the housing (10), and the sealing component (6) is a silicone ring or a rubber ring.

5. The venous blood recovery device according to claim 1, characterized in that: The invention also comprises a first hemostatic component (8), which is mounted on the blood outlet component (3) to open or close the blood outlet component (3); and a second hemostatic component (9), which is mounted on the recovery pipeline (4) to open or close the recovery pipeline (4); and one of the first hemostatic component (8) and the second hemostatic component (9) is selectively opened.

6. The venous blood recovery device according to any one of claims 1 to 5, characterized in that: The recovery pipeline (4) comprises a pipeline body (41) and a transition component (42); one end of the transition component (42) is connected to the pipeline body (41); the other end of the transition component (42) constitutes a first end port of the recovery pipeline (4); and the transition component (42) can be connected to or separated from the blood inlet component (2).

7. The venous blood recovery device according to claim 6, characterized in that: The adapter component (42) is fixedly mounted on the housing (10); the adapter component (42) is in a corner shape, with one end located inside the housing (10) and the other end extending to the outside of the housing (10); the pipeline main body (41) and the adapter component (42) are detachably connected.

8. The venous blood recovery device according to claim 7, characterized in that: A first sealing layer (21) is provided at the bottom of the blood inlet component (2), and a second sealing layer (421) is provided at the top of the transition component (42); the first sealing layer (21) and the second sealing layer (421) are both elastic layers; when the positions of the blood inlet component (2) and the transition component (42) correspond, the first sealing layer (21) and the second sealing layer (421) abut against each other.

9. The venous blood recovery device according to any one of claims 1 to 5, characterized in that: The shell (10) is provided with a first limiting member (13) and a second limiting member (14) at intervals in the circumferential direction, and the end cover (1) is provided with a third limiting member (15) on its circumference. When the end cover (1) is rotated to a filtering position, the third limiting member (15) is locked in position with the first limiting member (13); and when the end cover (1) is rotated to a recovery position, the third limiting member (15) is locked in position with the second limiting member (14).

10. A blood purification system, characterized in that: The blood purification system comprises the venous blood recovery device according to any one of claims 1 to 9 above.

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