Anti-blocking CRRT blood purification pipeline

Abstract

The application belongs to the technical field of medical equipment, and particularly relates to a kind of anti-blocking CRRT blood purification pipeline, which comprises a pipeline main body, a branch pipe is communicated on the pipeline main body, a fixing plate is arranged at the end of the branch pipe away from the pipeline main body, a filter screen is arranged in the pipeline main body, a fall-preventing net is arranged on the filter screen, a pull rod is fixedly connected to the filter screen, a through hole I is formed in the fixing plate for the pull rod to pass through, a moving plate is fixedly connected to the end of the pull rod away from the filter screen, a soft film is arranged between the moving plate and the fixing plate, a sealed cavity is formed between the soft film, the moving plate and the fixing plate; a locking assembly is arranged between the moving plate and the fixing plate for locking the moving plate, and after the locking assembly releases the locking of the moving plate, the moving plate can move along the radial direction of the pipeline main body relative to the fixing plate. The application can intercept blood clots through the filter screen, and transfer the blood clots to the branch pipe, so as to effectively prevent the blood clots from blocking the blood purification pipeline.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical equipment, and in particular relates to an anti-blocking CRRT blood purification pipeline. Background Art

[0002] CRRT (continuous renal replacement therapy) is a type of continuous renal replacement therapy. Its goal is to remove excess water, metabolic waste, and toxins from the body, correct water and electrolyte imbalances, ensure nutritional support, promote renal function recovery, and eliminate various cytokines and inflammatory mediators. It can be used to treat various acute and chronic renal failure conditions with unstable cardiovascular function, hypercatabolism, or cerebral edema, as well as multiple organ dysfunction syndrome, acute respiratory distress syndrome, crush syndrome, acute necrotizing pancreatitis, chronic heart failure, hepatic encephalopathy, and drug and toxic poisoning.

[0003] Clinically, after a patient's blood enters a blood purification system, it passes through a filter to remove metabolic waste and toxins, corrects water and electrolyte imbalances, and then returns to the patient's body through the blood purification system. During this process, heparin is added to the blood to prevent blood clotting. However, due to individual differences, the amount of heparin required varies. If too little heparin is added, blood clotting can occur and block the system, affecting the blood purification process and even endangering the patient's health. Therefore, it is necessary to design a blood purification system with anti-clogging capabilities. Summary of the Invention

[0004] The present invention aims to provide a blockage-proof CRRT blood purification pipeline to solve the problem of blood purification pipeline being blocked.

[0005] In order to achieve the above-mentioned purpose, the solution of the present invention is: a blockage-proof CRRT blood purification pipeline, including a pipeline main body, a branch pipe is connected to the pipeline main body, a fixed plate is provided at the end of the branch pipe away from the pipeline main body, a filter screen is provided in the pipeline main body, the filter screen is provided with an anti-fall net, the filter screen is fixedly connected to a pull rod, and a through hole I for the pull rod to pass through is provided on the fixed plate, and the end of the pull rod away from the filter screen is fixedly connected to a movable plate, a soft membrane is provided between the movable plate and the fixed plate, one end of the soft membrane is fixedly connected to the movable plate, and the other end of the soft membrane is fixedly connected to the fixed plate, and a sealed cavity is formed between the soft membrane, the movable plate and the fixed plate; a locking assembly for locking the movable plate is provided between the movable plate and the fixed plate, and after the locking assembly releases the lock on the movable plate, the movable plate can move relative to the fixed plate along the radial direction of the pipeline main body.

[0006] The working principle and beneficial effects of the scheme are that: in the scheme, when the blood in the pipeline body coagulates to form a blood clot, the blood clot is intercepted by the filter screen to prevent the blood clot from flowing with the blood in the pipeline body. Moreover, after the medical staff releases the locking of the moving plate by the locking assembly, the moving plate can be pulled to move outward, thereby pulling the filter screen into the branch pipe and transferring the blood clot into the branch pipe. At the same time, the anti-falling net on the filter screen abuts against the inner wall of the branch pipe to prevent the blood clot from falling back into the pipeline body. In this way, the scheme can not only intercept the blood clot but also transfer the blood clot into the branch pipe, thereby preventing the blood clot from blocking the pipeline body and ensuring the smooth flow of blood in the pipeline body.

[0007] Moreover, the soft film in the scheme can not only provide a moving amount for the moving plate but also well isolate the blood to avoid exposure of the blood.

[0008] Optionally, the locking assembly comprises a threaded limiting rod and a locking nut, the threaded limiting rod is fixedly connected with the moving plate, and the locking nut is threadedly connected to the threaded limiting rod. A through hole II is formed in the fixed plate and penetrable by the threaded limiting rod.

[0009] In the scheme, the locking nut is rotated to change the position of the locking nut on the threaded limiting rod, thereby releasing the restriction on the moving plate, and the filter screen is pulled into the branch pipe through the moving plate.

[0010] Optionally, the locking assembly comprises a ball screw pair, a mounting plate and a C-shaped clamp. The mounting plate is perpendicular to the fixed plate. A screw rod of the ball screw pair is rotatably mounted on the mounting plate. A nut of the ball screw pair is vertically slidably mounted on the mounting plate. The C-shaped clamp is fixedly connected with the nut of the ball screw pair and is used for clamping the moving plate.

[0011] In the scheme, the screw rod of the ball screw pair is rotated, the nut of the ball screw pair moves along the axial direction of the screw rod, thereby moving the C-shaped clamp and the moving plate, and the filter screen is pulled into the branch pipe.

[0012] Optionally, the through hole I is a strip-shaped hole. A pressure sensor is arranged between the C-shaped clamp and the moving plate. The pressure sensor is electrically connected with a controller. The controller is electrically connected with an alarm.

[0013] In the scheme, when the blood clot in the pipeline body is intercepted by the filter screen, the blood clot blocks part of the filter holes of the filter screen, the blood flow impact force on the filter screen increases, the impact force is transmitted to the moving plate through the pull rod, the inclination trend of the moving plate increases, the pressure signal detected by the pressure sensor increases, and the controller controls the alarm to work, thereby warning the medical staff that the filter screen has intercepted the blood clot and the blood clot needs to be pulled into the branch pipe by rotating the screw rod.

[0014] Optionally, the locking assembly further includes a drive motor for driving the screw of the ball screw pair to rotate, the drive motor is fixedly mounted on the mounting plate, and the controller controls the operation of the drive motor according to the signal transmitted by the pressure sensor.

[0015] In this solution, a drive motor is used to drive the screw of the ball screw pair to rotate, and the drive motor is controlled by a controller, so that the movable plate can be automatically moved, thereby pulling the filter and blood clots into the branch pipe in time and reducing the workload of medical staff.

[0016] Optionally, the controller is electrically connected to a display screen, and the display screen is used to display pressure data detected by the pressure sensor.

[0017] In this solution, the pressure signal detected by the pressure sensor is related to the blood viscosity within the tubing. Generally speaking, the greater the blood viscosity within the tubing, the greater the pressure signal detected by the pressure sensor. Medical staff can use the pressure data displayed on the display to determine the viscosity of the blood within the tubing and determine the appropriate amount of heparin to be added, preventing over- or under-addition.

[0018] Optionally, the mounting plate can be detachably mounted on the fixing plate.

[0019] In this solution, the mounting plate is detachable. Compared with the case where the mounting plate is fixed to the fixing plate, this solution can reuse the locking assembly and reduce material waste.

[0020] Optionally, a mounting ear plate is provided at the end of the mounting plate, and mounting holes are provided on the mounting ear plate and the fixing plate.

[0021] In this solution, the mounting plate can be installed by passing the bolt through the mounting hole and engaging with the nut thread.

[0022] Optionally, the pipeline body is provided with an accommodating cavity opposite to the branch pipe, the filter screen extends into the accommodating cavity, the number of anti-falling nets on the filter screen is more than two, and the more than two anti-falling nets are distributed on the filter screen along the axial direction of the branch pipe.

[0023] In this solution, after the movable plate moves, the filter part originally located in the receiving cavity moves into the pipeline body, continuing to intercept blood clots in the pipeline body. In this way, this solution can intercept blood clots in the pipeline body more than twice, increasing the number of anti-blocking times.

[0024] Optionally, there are two anti-fall nets, and the distance between the two anti-fall nets is the radial height of the pipeline body.

[0025] In this solution, after the filter moves, the anti-fall net located at the upper position abuts against the inner wall of the branch pipe to prevent blood clots from falling back into the main body of the pipeline; after the blood clot is intercepted on the filter again, the filter moves again, and the anti-fall net located at the lower position abuts against the inner wall of the branch pipe to prevent blood clots from falling back into the main body of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of an anti-blocking CRRT blood purification pipeline in Example 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure after the filter screen enters the branch pipe in Example 1 of the present invention;

[0028] Figure 3 This is a schematic structural diagram of an anti-blocking CRRT blood purification pipeline in Example 2 of the present invention;

[0029] Figure 4 for Figure 3 A is an enlarged schematic diagram;

[0030] Figure 5 This is a schematic diagram of the structure after the filter screen enters the branch pipe in the second embodiment of the present invention;

[0031] Figure 6 This is a schematic structural diagram of an anti-blocking CRRT blood purification pipeline in Example 3 of the present invention;

[0032] Figure 7 This is a structural diagram of the upper half of the filter screen after entering the branch pipe in Example 3 of the present invention. DETAILED DESCRIPTION

[0033] The following is further described in detail through specific implementation methods:

[0034] The symbols in the drawings of the specification include: pipeline main body 1, accommodating chamber 110, branch pipe 2, fixing plate 3, strip hole 301, filter screen 4, anti-fall net 5, pull rod 6, movable plate 7, soft membrane 8, sealing chamber 9, threaded limit rod 10, locking nut 11, ball screw pair 12, screw 121, nut 122, mounting plate 13, mounting ear plate 131, C-clamp 14, drive motor 15, bolt 16, bearing 17, T-shaped slider 18, pressure sensor 19, controller 20, alarm 21, display screen 22.

[0035] Example 1

[0036] This embodiment is basically as Figure 1 ( Figure 1The arrow in the figure indicates the direction of blood flow. A blockage-resistant CRRT blood purification circuit is shown in FIG. It includes a circuit body 1 connected to a branch pipe 2. A fixed plate 3 is integrally formed at the end of the branch pipe 2 facing away from the circuit body 1. A filter 4 is installed within the circuit body 1, with a drop-proof screen 5 welded to the filter 4. The drop-proof screen 5 is located on the side of the filter 4 facing the blood flow path. A pull rod 6 is welded to the top of the filter 4. The fixed plate 3 has a through hole 1 through which the pull rod 6 passes. A movable plate 7 is fixedly connected to the end of the pull rod 6 facing away from the filter 4. A flexible membrane 8 and a locking assembly for locking the movable plate 7 are located between the movable plate 7 and the fixed plate 3. One end of the flexible membrane 8 is welded to the movable plate 7, and the other end of the flexible membrane 8 is welded to the fixed plate 3. A sealed chamber 9 is formed between the flexible membrane 8, the movable plate 7, and the fixed plate 3. The flexible membrane 8 is made of medical silicone. When the locking assembly releases the movable plate 7, the movable plate 7 can move radially relative to the fixed plate 3. The locking assembly in this embodiment includes a threaded limiting rod 10 and a locking nut 11. The threaded limiting rod 10 is fixedly connected to the movable plate 7. The locking nut 11 is threadedly connected to the threaded limiting rod 10. A through hole II is provided on the fixed plate 3 for the threaded limiting rod 10 to pass through.

[0037] During specific use, when a blood clot appears in the pipeline main body 1, the blood clot flows with the blood to the filter 4, and the blood clot is intercepted by the filter 4, preventing the blood clot from accumulating in the pipeline main body 1 as the blood flows. Subsequently, the medical staff rotates the locking nut 11 located below the fixed plate 3, causing the locking nut 11 to move downward, and then pulls the movable plate 7 upward. At this time, the pull rod 6 and the filter 4 enter the branch pipe 2 as the movable plate 7 moves upward, thereby realizing the transfer of the blood clot and allowing the blood clot to enter the branch pipe 2. Moreover, at this time, the left end of the anti-fall net 5 is against the inner wall of the branch pipe 2, separating the space where the blood clot is located in the branch pipe 2 from the pipeline main body 1, as shown in FIG. Figure 2 As shown, blood clots are prevented from falling back into the pipeline body 1. In summary, in this embodiment, blood clots are intercepted and transferred to the branch tube 2, thereby preventing blood clots from blocking the pipeline body 1 and ensuring smooth blood flow in the pipeline body 1.

[0038] In addition, during the upward movement of the movable plate 7, the soft membrane 8 stretches to provide movement for the movable plate 7. Although blood will flow into the sealed cavity 9 during this process, the blood will not come into contact with the outside world, which can effectively prevent blood exposure.

[0039] Example 2

[0040] The difference between this embodiment and the first embodiment is that the locking assembly in this embodiment is different from the locking assembly in the first embodiment. Figure 3As shown, the locking assembly in this embodiment includes a ball screw assembly 12, a mounting plate 13, a C-clip 14, and a drive motor 15 for driving the screw 121 of the ball screw assembly 12. The mounting plate 13 is detachably mounted on the fixed plate 3. Specifically, a mounting lug 131 is integrally formed at the bottom end of the mounting plate 13. The mounting lug 131 and the fixed plate 3 are both provided with mounting holes. Bolts 16 are inserted through the mounting holes and then threadedly engage with ordinary nuts to secure the mounting plate 13.

[0041] The drive motor 15 is fixedly mounted on the mounting plate 13. The screw rod 121 of the ball screw pair 12 is rotatably mounted on the mounting plate 13 through the bearing 17. The nut 122 of the ball screw pair 12 is vertically slidably mounted on the mounting plate 13. Specifically, a T-shaped slider 18 is welded to the nut 122 of the ball screw pair 12, and a T-shaped groove for the T-shaped slider 18 to slide is provided on the mounting plate 13. The C-shaped clamp 14 is welded to the nut 122 of the ball screw pair 12. The C-shaped clamp 14 is used to clamp the left end of the movable plate 7, combined with the Figure 4 As shown, a pressure sensor 19 is installed between the C-clamp 14 and the movable plate 7. The pressure sensor 19 is electrically connected to a controller 20, which is in turn electrically connected to an alarm 21 and a display screen 22. The controller 20 controls the alarm 21 and the drive motor 15 based on the signal transmitted by the pressure sensor 19. The display screen 22 is used to display the pressure data detected by the pressure sensor 19. In this embodiment, the pressure sensor 19 is a thin film pressure sensor, which is fixedly attached to the inner wall of the bottom end of the C-clamp 14. Furthermore, the through hole I in the fixed plate 3 is a strip-shaped hole 301.

[0042] During specific use, when the blood in the pipeline body 1 flows through the filter 4, due to the certain viscosity of the blood, the filter 4 is subjected to an impact force along the axial direction of the pipeline body 1. The impact force on the filter 4 is transmitted to the movable plate 7 through the pull rod 6. In addition, the through hole I on the fixed plate 3 is a strip-shaped hole 301, and the left side of the pull rod 6 is not supported. Therefore, the force on the movable plate 7 is unbalanced, and the movable plate 7 has a movement trend of lower left and higher right. The pressure applied by the movable plate 7 on the C-clamp 14 will change with the movement trend of the movable plate 7. Specifically, when the blood viscosity increases, this movement trend increases, the degree of force imbalance on the movable plate 7 is aggravated, and the pressure on the C-clamp 14 increases; when the blood viscosity decreases, this movement trend decreases, the force imbalance on the movable plate 7 is alleviated, and the pressure on the C-clamp 14 is reduced.

[0043] Therefore, during the blood purification process, the display screen 22 displays the pressure data detected by the pressure sensor 19 in real time, so as to feed back the viscosity information of the blood in the pipeline body 1 in real time, so that the medical staff can master the blood viscosity. When the blood viscosity data in the pipeline body 1 rises to a certain value, the pressure exerted by the left end of the moving plate 7 on the C-shaped clamp 14 also reaches a certain value. The pressure sensor 19 transmits the detected pressure signal to the controller 20, the controller 20 controls the alarm 21 to work, and the alarm 21 emits a beeping sound to warn the medical staff to add heparin to the blood in time to reduce the blood viscosity, so as to reduce the probability of blood clot formation as much as possible.

[0044] When the blood clot has been formed in the pipeline body 1, the blood clot flows with the blood to the filter screen 4 and is intercepted by the filter screen 4. At this time, part of the filter holes of the filter screen 4 are blocked by the blood clot, the impact on the filter screen 4 is further increased, the degree of imbalance of the force acting on the moving plate 7 is further intensified, the pressure exerted by the left end of the moving plate 7 on the C-shaped clamp 14 reaches a certain value, the pressure sensor 19 transmits the detected pressure signal to the controller 20, the controller 20 controls the alarm 21 and the driving motor 15 to work, the alarm 21 emits a beeping sound, and at the same time, the driving motor 15 drives the screw rod 121 of the ball screw pair 12 to rotate clockwise, the nut 122 of the ball screw pair 12 moves upward with the C-shaped clamp 14, so as to realize the automatic upward movement of the moving plate 7, and further pull the filter screen 4 and the blood clot on the filter screen 4 into the branch pipe 2, as shown in Figure 5 , and the anti-falling net 5 prevents the blood clot from falling back into the pipeline body 1.

[0045] That is, the embodiment real-time monitors the blood viscosity in the pipeline body 1, so that the medical staff can add heparin in time, which prevents the formation of blood clots to a certain extent. After the blood clot is formed, the blood clot is intercepted by the filter screen 4 and automatically transferred to the branch pipe 2, so as to prevent the blood purification pipeline from being blocked. In the embodiment, once the blood clot is intercepted by the filter screen 4, the driving motor 15 is triggered to work, so as to transfer the blood clot to the branch pipe 2. The processing speed of the blood clot is fast, and the medical staff does not need to manually operate, which reduces the workload of the medical staff.

[0046] In addition, the mounting plate 13 in the embodiment is detachable, so that the locking assembly can be repeatedly used, which reduces the waste of medical materials and reduces the medical cost.

[0047] Embodiment three

[0048] The difference between the embodiment and the embodiment two is that, as shown in Figure 6 , in the embodiment, the pipeline body 1 is integrally formed with a containing cavity 110 opposite to the branch pipe 2, the filter screen 4 extends into the containing cavity 110, the number of the anti-falling nets 5 on the filter screen 4 is two, and the two anti-falling nets 5 are distributed on the filter screen 4 along the axial direction of the branch pipe 2, and the spacing between the two anti-falling nets 5 is the radial height of the pipeline body 1.

[0049] In this embodiment, when the filter screen 4 located in the pipeline body 1 partially intercepts blood clots, the controller 20 controls the driving motor 15 to work, the driving motor 15 drives the screw rod 121 of the ball screw pair 12 to rotate clockwise, the nut 122 of the ball screw pair 12 drives the C-shaped clamp 14 to move upwards, so that the filter screen 4 with the blood clots enters the branch pipe 2; at the same time, the filter screen 4 located in the containing cavity 110 moves upwards into the pipeline body 1, as shown in FIG. 5. In this way, if subsequent blood clots are formed, the blood clots can be continuously intercepted and transferred, thereby continuously exerting the anti-blocking effect. Figure 7

[0050] Embodiment Four

[0051] The difference between this embodiment and the embodiment one or the embodiment two or the embodiment three is that, in this embodiment, a bellows is used instead of the soft film 8, and the bellows is made of medical silica gel. In this embodiment, the anti-deformation ability of the bellows in the radial direction is smaller than that of the soft film 8. When the soft film 8 is used, the volume change of the sealing cavity 9 is reflected in all directions, so that before the moving plate 7 moves upwards, the blood in the branch pipe 2 will flow into and fill the sealing cavity 9 through the gap of the through hole I, and the initial volume of the sealing cavity 9 is relatively large, which may affect the work of the locking assembly. When the bellows is used, the volume change of the sealing cavity 9 is mainly concentrated in the axial direction, and the change in the radial direction is very small, which will not affect the work of the locking assembly.

[0052] The above is only an embodiment of the present application, and the present application is not limited to this embodiment. The specific structure and characteristics of the scheme and other common knowledge are not described in detail herein. The ordinary skilled person in the art knows all the ordinary technical knowledge in the field of the present application before the filing date or the priority date, can know all the prior art in the field, and has the ability to apply conventional experimental means before that date. The ordinary skilled person in the art can improve and implement the scheme based on their own ability under the guidance of this application. Some typical known structures or known methods should not be an obstacle for the ordinary skilled person in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application. These will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.​

Claims

1. A blockage-resistant CRRT blood purification circuit, comprising a circuit body, characterized in that: The pipeline main body is connected with a branch pipe, and a fixed plate is provided at the end of the branch pipe away from the pipeline main body. A filter screen is provided in the pipeline main body, and an anti-fall net is provided on the filter screen. The filter screen is fixedly connected to a pull rod, and a through hole Ⅰ for the pull rod to pass through is provided on the fixed plate. The end of the pull rod away from the filter screen is fixedly connected to a movable plate, and a soft membrane is provided between the movable plate and the fixed plate, one end of the soft membrane is fixedly connected to the movable plate, and the other end of the soft membrane is fixedly connected to the fixed plate, and a sealed cavity is formed between the soft membrane, the movable plate and the fixed plate; a locking assembly for locking the movable plate is provided between the movable plate and the fixed plate, and after the locking assembly releases the lock on the movable plate, the movable plate can move relative to the fixed plate along the radial direction of the pipeline main body.

2. The anti-blocking CRRT blood purification circuit according to claim 1, characterized in that: The locking assembly includes a threaded limiting rod and a locking nut. The threaded limiting rod is fixedly connected to the movable plate. The locking nut is threadedly connected to the threaded limiting rod. A through hole II is provided on the fixed plate for the threaded limiting rod to pass through.

3. The anti-blocking CRRT blood purification circuit according to claim 1, characterized in that: The locking assembly includes a ball screw pair, a mounting plate and a C-type clamp. The mounting plate is perpendicular to the fixed plate. The screw of the ball screw pair is rotatably mounted on the mounting plate. The nut of the ball screw pair is vertically slidably mounted on the mounting plate. The C-type clamp is fixedly connected to the nut of the ball screw pair. The C-type clamp is used to clamp the movable plate.

4. The anti-blocking CRRT blood purification circuit according to claim 3, characterized in that: The through hole I is a strip-shaped hole. A pressure sensor is provided between the C-shaped clamp and the movable plate. The pressure sensor is electrically connected to a controller, and the controller is electrically connected to an alarm.

5. The anti-blocking CRRT blood purification circuit according to claim 4, characterized in that: The locking assembly further includes a drive motor for driving the screw of the ball screw pair to rotate. The drive motor is fixedly mounted on the mounting plate. The controller controls the operation of the drive motor according to the signal transmitted by the pressure sensor.

6. The anti-blocking CRRT blood purification circuit according to claim 4, characterized in that: The controller is electrically connected to a display screen, and the display screen is used to display pressure data detected by the pressure sensor.

7. The anti-blocking CRRT blood purification circuit according to claim 3, characterized in that: The mounting plate is detachably mounted on the fixing plate.

8. The anti-blocking CRRT blood purification circuit according to claim 7, characterized in that: The end of the mounting plate is provided with a mounting ear plate, and both the mounting ear plate and the fixing plate are provided with mounting holes.

9. The anti-blocking CRRT blood purification circuit according to claim 1, characterized in that: The pipeline body is provided with an accommodating cavity opposite to the branch pipe, the filter screen extends into the accommodating cavity, the number of anti-falling nets on the filter screen is more than two, and the more than two anti-falling nets are distributed on the filter screen along the axial direction of the branch pipe.

10. The anti-blocking CRRT blood purification circuit according to claim 9, characterized in that: There are two anti-falling nets, and the distance between the two anti-falling nets is the radial height of the pipeline body.

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