Multi-stage pressure regulating blood filtration device

Abstract

The present invention discloses a multi-stage pressure-regulating blood filtration device, comprising a filter, wherein a filtration mechanism is arranged inside the filter, a detection mechanism is arranged on the right side of the filtration mechanism, a negative pressure collection mechanism is connected to the right pipeline of the filtration mechanism, the detection mechanism is fixedly connected to the filter, the detection mechanism is connected to the pipeline of the negative pressure collection mechanism, the filtration mechanism comprises a blood cavity, the blood cavity is located on the left side of the filter, a filtration membrane is arranged in the middle of the filter, a convection box is arranged on the right side of the filter, the negative pressure collection mechanism comprises a buffer box, the buffer box is connected to the right pipeline of the convection box, the upstream pipeline of the buffer box is connected to a blood pump, the upstream pipeline of the blood pump is connected to a waste liquid tank, the upper end of the blood cavity is connected to a human artery, and the present invention has the characteristics of strong practicality and automatic pressure adjustment according to human blood pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a multi-stage pressure regulating blood filtration device. Background Art

[0002] Hemofiltration is a process in which a machine pump or the patient's own blood pressure is used to cause blood to flow through a filter in an extracorporeal circuit. A large amount of fluid and solutes are filtered out under the action of the filtration pressure, and an electrolyte solution similar to the plasma fluid composition is supplemented to achieve the purpose of blood purification. In the process of hemofiltration controlled by the patient's own blood pressure, because the solution and some impurities are removed in the filter mainly through convection and transmembrane pressure, as the hemofiltration proceeds, the human blood pressure is constantly changing, and the pressure needs to be adjusted to adapt to it in order to achieve the best filtration effect. Once the pressure of the hemofiltration devices currently on the market is set, it cannot be adjusted automatically, which affects the effect of hemofiltration to a certain extent. Therefore, it is very necessary to design a multi-stage pressure-regulating hemofiltration device that is highly practical and automatically adjusts the pressure according to the human blood pressure. Summary of the invention

[0003] The object of the present invention is to provide a multi-stage pressure regulating blood filtration device to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a multi-stage pressure-regulating blood filtration device, comprising a filter, characterized in that: a filtration mechanism is arranged inside the filter, a detection mechanism is arranged on the right side of the filtration mechanism, a negative pressure collection mechanism is connected to the right pipe of the filtration mechanism, the detection mechanism is fixedly connected to the filter, and the detection mechanism is connected to the negative pressure collection mechanism pipe.

[0005] According to the above technical solution, the filtration mechanism includes a blood cavity, which is located on the left side of the filter, a filtration membrane is arranged in the middle of the filter, a convection box is arranged on the right side of the filter, and the negative pressure collection mechanism includes a buffer box, which is connected to the right side pipe of the convection box, the upstream pipe of the buffer box is connected to a blood pump, the upstream pipe of the blood pump is connected to a waste liquid tank, the upper end of the blood cavity is connected to a human artery, and the lower end of the blood cavity is connected to a human vein.

[0006] According to the above technical solution, the detection mechanism includes a movable shaft, which is movably connected to the filter, a liquid chamber is arranged inside the movable shaft, a spring is fixedly connected inside the movable shaft, a piston is fixedly connected to the other end of the spring, a pull rope is fixedly connected to the outer circle of the movable shaft, a cleaning ball is fixedly connected to the other end of the pull rope, a conical hole is arranged on the top of the buffer box, a tension spring is fixedly connected to the lower end of the conical hole, a conical plug is fixedly connected to the other end of the tension spring, a partition is arranged in the middle of the conical plug, the partition divides the conical plug into a lower chamber and an upper chamber, a through hole is arranged in the middle of the partition, and the upper chamber is connected to the liquid chamber pipeline.

[0007] According to the above technical solution, a replacement fluid tank is provided on one side of the filter, a downstream pipeline of the replacement fluid tank is connected to a liquid pump, and the liquid pump is connected to the blood cavity pipeline.

[0008] According to the above technical solution, a cavity is provided on the middle pipe between the liquid pump and the blood cavity, an elastic pull rope is fixedly connected to the upper part of the cavity, the other end of the elastic pull rope is fixedly connected to a flow limiting valve, gas is provided inside the cavity, and the cavity is connected to the lower cavity pipe.

[0009] According to the above technical solution, a switch is fixedly connected to the right side of the filter membrane, an electrical box is fixedly connected to the upper end of the convection box, a torsion spring is fixedly connected to the upper end of the electrical box, the torsion spring is fixedly connected to the switch, a motor is arranged inside the convection box, the output shaft of the motor is fixedly connected to a rotating shaft, the outer circle of the rotating shaft is fixedly connected to an elastic rope, the other end of the elastic rope is fixedly connected to a protrusion, a concave block is arranged on the inner side of the movable shaft, and the switch is electrically connected to the motor.

[0010] According to the above technical solution, an air cavity is provided inside the cleaning ball, and a plurality of groups of small holes are provided on the outer wall of the cleaning ball. Compression springs are fixedly connected inside the plurality of groups of small holes, and a brush is movably connected inside the compression springs. The air cavity is connected to the lower cavity pipe.

[0011] According to the above technical solution, an airbag is fixedly connected to the right side of the electrical box, and the airbag is fixedly connected to the switch. A left passage and a right passage are arranged between the artery and vein of the human body, and an adjustment cavity is arranged between the left passage and the right passage. The adjustment cavity is fixedly connected to the filter, and an air chamber is arranged on the right side of the adjustment cavity. A return spring is fixedly connected to the inside of the adjustment cavity, and a movable plug is fixedly connected to the other end of the return spring. The left passage and the right passage are both movably connected to the movable plug, and the air chamber is connected to the airbag pipeline.

[0012] According to the above technical solution, the filtration membrane is made of polymer material.

[0013] According to the above technical solution, the cleaning ball and the brush are made of flexible materials.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a filtering mechanism, can filter and separate harmful substances in the blood to achieve the purpose of blood purification; by providing a detection mechanism, can sense the size of the blood pressure during filtration at any time, and adjust the negative pressure set by the negative pressure collection mechanism in real time according to the size of the flow; because the flow of body fluids is related to the pressure difference, the replenishment speed of the replenishing fluid can be adjusted in real time according to the size of the pressure, and can automatically clear and flush when the filtering mechanism is blocked, thereby achieving the purpose of intelligent filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the local structure of A of the present invention;

[0019] Figure 4 It is a schematic diagram of the local structure of B of the present invention;

[0020] Figure 5 It is a schematic diagram of the local structure of the C part of the present invention;

[0021] Figure 6 It is a schematic diagram of the local structure at D of the present invention;

[0022] Figure 7 It is a schematic diagram of the local structure of E of the present invention;

[0023] In the figure: 1, filter; 2, blood cavity; 3, filter membrane; 4, rotating shaft; 5, pull rope; 6, cleaning ball; 7, liquid cavity; 8, spring; 9, piston; 10, convex block; 11, concave block; 12, tension spring; 13, movable shaft; 14, switch; 15, cone hole; 16, cone plug; 17, partition; 18, buffer box; 19, blood pump; 20, waste liquid tank; 21, through hole; 22, lower cavity; 23, Upper cavity; 24. Torsion spring; 25. Air cavity; 26. Small hole; 27. Compression spring; 28. Brush; 29. ​​Electrical box; 30. Elastic rope; 31. Displacement fluid tank; 32. Liquid pump; 33. Cavity; 34. Flow limiting valve; 35. Elastic pull rope; 36. Convection box; 37. Air bag; 38. Adjustment cavity; 39. Movable plug; 40. Air chamber; 41. Left passage; 42. Right passage; 43. Return spring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-7 The present invention provides a technical solution: a multi-stage pressure-regulating blood filtration device, comprising a filter 1, characterized in that: a filtration mechanism is arranged inside the filter 1, a detection mechanism is arranged on the right side of the filtration mechanism, a negative pressure collecting mechanism is connected to the right pipeline of the filtration mechanism, the detection mechanism is fixedly connected to the filter 1, and the detection mechanism is connected to the negative pressure collecting mechanism pipeline. By providing the filtration mechanism, harmful substances in the blood can be filtered and separated to achieve the purpose of blood purification. By providing the detection mechanism, the pressure during blood filtration can be sensed at any time, and the negative pressure set by the negative pressure collecting mechanism can be adjusted in real time according to the flow rate. Because the flow rate of body fluid is related to the pressure difference, the replenishment speed of the replenishing fluid can be adjusted in real time according to the pressure, and when the filtration mechanism is blocked, it can be cleared and flushed automatically to achieve the purpose of intelligent filtration.

[0026] The filtering mechanism includes a blood cavity 2, which is located on the left side of the filter 1. A filter membrane 3 is provided in the middle of the filter 1. A convection box 36 is provided on the right side of the filter 1. The negative pressure collection mechanism includes a buffer box 18, which is connected to the right pipe of the convection box 36. The upstream pipe of the buffer box 18 is connected to a blood pump 19, and the upstream pipe of the blood pump 19 is connected to a waste liquid tank 20. The upper end of the blood cavity 2 is connected to the human artery, and the lower end of the blood cavity 2 is connected to the human vein. Under the action of the human body's own blood pressure, blood flows out of the artery and enters the blood cavity 2. Under the action of the blood pump 19, harmful small and medium molecules and plasma in the blood pass through the filter membrane 3 and enter the convection box 36, and pass through the buffer box 18 and enter the waste liquid tank 20. The other parts of the blood enter the human vein through the pipe at the lower end of the blood cavity 2, thereby achieving the purpose of filtering harmful substances and purifying blood.

[0027] The detection mechanism includes a movable shaft 13, which is movably connected to the filter 1, a liquid chamber 7 is arranged inside the movable shaft 13, a spring 8 is fixedly connected inside the movable shaft 13, a piston 9 is fixedly connected to the other end of the spring 8, a pull rope 5 is fixedly connected to the outer circle of the movable shaft 13, a cleaning ball 6 is fixedly connected to the other end of the pull rope 5, a tapered hole 15 is arranged on the top of the buffer box 18, a tension spring 12 is fixedly connected to the lower end of the tapered hole 15, a tapered plug 16 is fixedly connected to the other end of the tension spring 12, and a tapered plug 16 is arranged in the middle of the tapered plug 16. There is a partition 17, which divides the cone plug 16 into a lower chamber 22 and an upper chamber 23. A through hole 21 is set in the middle of the partition 17. The upper chamber 23 is connected to the liquid chamber 7 pipeline. In the initial state, the cone plug 16 is in a semi-open state. The filtered solution flows to the waste liquid tank 20 under the action of the blood pump 19. Therefore, the solute in the convection box 36 forms a fluid from left to right, thereby exerting a force on the cleaning ball 6, pushing the cleaning ball 6 to drive the liquid chamber 7, together with the movable shaft 13, to move clockwise. While the liquid chamber 7 rotates Due to the action of centrifugal force, the piston 9 will move toward the distal end, thereby pushing the liquid in the liquid chamber 7 into the upper chamber 23. As the liquid in the upper chamber 23 enters, the weight of the cone plug 16 gradually increases due to the entry of the liquid, and it slowly moves downward, thereby reducing the opening amplitude of the cone hole 15, and the negative pressure decreases accordingly, resulting in a decrease in the speed of solute convection in the convection box 36, and the rotation speed of the liquid chamber 7 also decreases accordingly. The liquid entering the upper chamber 23 will also decrease, and the cone plug 16 will slowly move upward, thereby reducing the opening amplitude of the cone hole 15, and the negative pressure increases accordingly. Therefore, the rotation speed of the liquid chamber 7 and the negative pressure generated will maintain a stable dynamic equilibrium state. Therefore, when the blood pressure of the human body decreases, the rotation speed of the liquid chamber 7 will slow down, thereby increasing the negative pressure. When the blood pressure of the human body increases, the rotation speed of the liquid chamber 7 will increase, thereby reducing the negative pressure. Therefore, the pressure difference can be automatically adjusted through the interaction between the detection mechanism and the negative pressure collection mechanism to keep it in a stable state, providing protection for blood filtration.

[0028] A replacement fluid tank 31 is provided on one side of the filter 1, and a liquid pump 32 is connected to the downstream pipeline of the replacement fluid tank 31. The liquid pump 32 is connected to the pipeline of the blood cavity 2. While the filtering mechanism discharges the solution, the replacement fluid in the replacement fluid tank 31 is pumped into the blood cavity 2 through the liquid pump 32 to achieve the purpose of supplementing the blood.

[0029] A cavity 33 is provided on the intermediate pipeline between the liquid pump 32 and the blood cavity 2, an elastic drawstring 35 is fixedly connected to the upper part of the cavity 33, the other end of the elastic drawstring 35 is fixedly connected to the flow limiting valve 34, gas is provided inside the cavity 33, the cavity 33 is connected to the lower cavity 22 by a pipeline, under normal circumstances, the pressure difference remains constant, the flow rate of the solution discharged by the filtering mechanism also remains constant, so the replenishment of the replacement fluid also maintains a certain speed, when the blood pressure of the human body becomes smaller, the solution entering the convection box 36 is also less, which will cause the rotation speed of the liquid cavity 7 to slow down, and the liquid entering the upper cavity 23 is reduced, so that the pressure of the lower cavity 22 becomes smaller, and the gas in the cavity 33 enters the lower cavity 22 through the pipeline. The gas in the lower chamber 22 enters the cavity 33 through the pipe, thereby causing the flow limiting valve 34 to move downward and the pipe to widen, thereby increasing the amount of replacement fluid delivered to the blood cavity 2 to accommodate a larger loss of solution. Therefore, the flow rate of the replacement fluid delivered can be adjusted in real time according to the changes in the human blood pressure, thereby achieving the purpose of stabilizing the blood.

[0030] A switch 14 is fixedly connected to the right side of the filter membrane 3, an electrical box 29 is fixedly connected to the upper end of the convection box 36, a torsion spring 24 is fixedly connected to the upper end of the electrical box 29, the torsion spring 24 is fixedly connected to the switch 14, a motor is arranged inside the convection box 36, the output shaft of the motor is fixedly connected to the rotating shaft 4, the outer circle of the rotating shaft 4 is fixedly connected to the elastic rope 30, the other end of the elastic rope 30 is fixedly connected to the protrusion 10, a concave block 11 is arranged on the inner side of the movable shaft 13, the switch 14 is electrically connected to the motor, as the blood is filtered, some macromolecules in the blood will adhere to the filter membrane 3 and hinder the filtration of the blood, as the macromolecules slowly accumulate, the filter membrane 3 will be blocked, at this time the liquid in the convection box 36 is The increased negative pressure is sucked away, and the liquid cavity 7 stops moving because of the disappearance of the pressure difference. However, under the action of the pressure difference on the left and right sides of the filter membrane 3, the filter membrane 3 will be squeezed and bulge to the right, and at the same time, the switch 14 is pushed to close. After the motor is energized, it drives the shaft 4 to rotate counterclockwise. As the shaft 4 rotates, the concave block 11 connected by the elastic rope 30 moves toward the distal end and is stuck in the middle of the convex block 10 of the movable shaft 13, thereby driving the liquid cavity 7 to move clockwise. Because the motor speed is fast, the liquid cavity 7 rotates faster, so that the negative pressure generated also reaches the maximum value, and its suction force on the filter membrane 3 is also increased to the maximum value, which can make the large molecules squeeze the filter membrane 3 under the action of the large suction force, so as to achieve the cleaning effect on the filter membrane 3.

[0031] An air cavity 25 is provided inside the cleaning ball 6, and a plurality of groups of small holes 26 are provided on the outer wall of the cleaning ball 6. A compression spring 27 is fixedly connected inside the plurality of small holes 26, and a brush 28 is movably connected inside the compression spring 27. The air cavity 25 is connected to the lower cavity 22 by a pipeline. When the filter membrane 3 is blocked, because the liquid cavity 7 rotates at a faster speed, the centrifugal force on the cleaning ball 6 is also larger, and the diameter of its rotation is also maximum. When the cleaning ball 6 rotates to the farthest distance, it can collide with the filter membrane 3, so that the filter membrane 3 produces intermittent vibration, and the macromolecules attached thereto are shaken off into the blood, thereby achieving the cleaning effect on the filter membrane 3. At the same time, because the liquid cavity 7 rotates at a faster speed, more liquid therein enters the upper cavity 23, so that the gas in the lower cavity 22 enters the air cavity 25 of the cleaning ball 6, and the gas in the air cavity 25 that enters pushes the brush 28 out of the small hole 26, so that the cleaning ball 6 can wash the inner surface of the filter membrane 3 while vibrating the filter membrane 3, thereby achieving the purpose of double cleaning.

[0032] An airbag 37 is fixedly connected to the right side of the electrical box 29, and the airbag 37 is fixedly connected to the switch 14. A left passage 41 and a right passage 42 are arranged between the artery and vein of the human body, and an adjustment chamber 38 is arranged between the left passage 41 and the right passage 42. The adjustment chamber 38 is fixedly connected to the filter 1, and an air chamber 40 is arranged on the right side of the adjustment chamber 38. A movable plug 39 is arranged inside the adjustment chamber 38. The left passage 41 and the right passage 42 are both movably connected to the movable plug 39, and the air chamber 40 is connected to the airbag 37 pipeline. When the filtering mechanism works normally, blood circulates through the right passage 42. When the filter membrane 3 is blocked, the rightward movement of the switch 14 squeezes the airbag 37, so that the liquid in the airbag 37 enters the air chamber 40 and pushes the movable plug 39 to move to the right. At this time, the right passage 42 is closed, and the left passage 41 is opened. Blood circulates through the left passage 41. At the same time, when the filter membrane 3 is blocked, the start state 3, and the filter 3 is in the state of being completely discharged. When the filter 3 is in the state of being discharged, the filter 3 is in the state of being completely discharged. When the filter 3 is in the state of being completely discharged, the filter 3 is in the state of being completely discharged. When the filter 3 is in the state of being completely discharged, the filter 3 is in the state of being completely discharged. When the filter 3 is in the state of being completely discharged, the filter 3 is in the state of being completely discharged. When the filter 3 is in the state of being completely discharged, the filter 3 is in the state of being completely discharged. When the filter 3 is in the state of being completely discharged, the filter 3 is in the state of being completely discharged. When the filter 3 is in the state of being completely discharged, the filter 3 is in the state of being completely discharged.

[0033] The filter membrane 3 is made of a polymer material with better strength and toughness to adapt to various mutation situations.

[0034] The cleaning ball 6 and the brush 28 are made of flexible materials to prevent the filter membrane 3 from being broken during collision and washing.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-stage pressure regulating blood filtration device, comprising a filter (1), characterized in that: The filter (1) is provided with a filtering mechanism inside, a detection mechanism is provided on the right side of the filtering mechanism, a pipeline on the right side of the filtering mechanism is connected to a negative pressure collection mechanism, the detection mechanism is fixedly connected to the filter (1), and the detection mechanism is connected to the pipeline of the negative pressure collection mechanism; A filter membrane (3) is arranged in the middle of the filter (1); The filtration membrane (3) is made of polymer material; The negative pressure collection mechanism comprises a buffer box (18), a conical hole (15) is arranged at the top of the buffer box (18), a tension spring (12) is fixedly connected to the lower end of the conical hole (15), a conical plug (16) is fixedly connected to the other end of the tension spring (12), a partition (17) is arranged in the middle of the conical plug (16), and the partition (17) divides the conical plug (16) into a lower chamber (22) and an upper chamber (23); The detection mechanism comprises a movable shaft (13), the movable shaft (13) is movably connected to the filter (1), a liquid chamber (7) is arranged inside the movable shaft (13), a spring (8) is fixedly connected inside the movable shaft (13), the other end of the spring (8) is fixedly connected to a piston (9), the outer circle of the movable shaft (13) is fixedly connected to a pull rope (5), the other end of the pull rope (5) is fixedly connected to a cleaning ball (6), a through hole (21) is arranged in the middle of the partition (17), and the upper chamber (23) is connected to the liquid chamber (7) through a pipeline; The cleaning ball (6) is provided with an air cavity (25) inside, and the outer wall of the cleaning ball (6) is provided with a plurality of groups of small holes (26), the insides of the plurality of groups of small holes (26) are fixedly connected with compression springs (27), the insides of the compression springs (27) are movably connected with a brush (28), and the air cavity (25) is connected to the lower cavity (22) through a pipeline; The filtering mechanism comprises a blood cavity (2), the blood cavity (2) is located on the left side of the filter (1), a convection box (36) is arranged on the right side of the filter (1), the buffer box (18) is connected to the right side pipeline of the convection box (36), the upstream pipeline of the buffer box (18) is connected to a blood pump (19), the upstream pipeline of the blood pump (19) is connected to a waste liquid tank (20), the upper end of the blood cavity (2) is connected to a human artery, and the lower end of the blood cavity (2) is connected to a human vein.

2. A multi-stage pressure regulating blood filtration device according to claim 1, characterized in that: A switch (14) is fixedly connected to the right side of the filter membrane (3); an electrical box (29) is fixedly connected to the upper end of the convection box (36); a torsion spring (24) is fixedly connected to the upper end of the electrical box (29); the torsion spring (24) is fixedly connected to the switch (14); a motor is arranged inside the convection box (36); the output shaft of the motor is fixedly connected to a rotating shaft (4); the outer circle of the rotating shaft (4) is fixedly connected to an elastic rope (30); the other end of the elastic rope (30) is fixedly connected to a convex block (10); a concave block (11) is arranged on the inner side of the movable shaft (13); and the switch (14) is electrically connected to the motor.

3. A multi-stage pressure regulating blood filtration device according to claim 2, characterized in that: An air bag (37) is fixedly connected to the right side of the electrical box (29), and the air bag (37) is fixedly connected to the switch (14). A left passage (41) and a right passage (42) are provided between the artery and vein of the human body, and an adjustment chamber (38) is provided between the left passage (41) and the right passage (42). The adjustment chamber (38) is fixedly connected to the filter (1). An air chamber (40) is provided on the right side of the adjustment chamber (38). A return spring (43) is fixedly connected to the inside of the adjustment chamber (38), and the other end of the return spring (43) is fixedly connected to a movable plug (39). The left passage (41) and the right passage (42) are both movably connected to the movable plug (39), and the air chamber (40) is connected to the air bag (37) pipeline.

4. The multi-stage pressure regulating blood filtration device according to claim 1, characterized in that: The cleaning ball (6) and the brush (28) are made of flexible materials.

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