Hemodialysis system

Abstract

The invention relates to a hemodialysis system which comprises a dialysis pump pressure unit used for purifying and pumping blood, the dialysis pump pressure unit has a pre-flushing state, a blood leading state, a dialysis state and a blood returning state, and the dialysis pump pressure unit is provided with a liquid inlet and a liquid outlet. Before blood purification, the dialysis pumping unit is in a pre-flushing state, and at the moment, a liquid inlet and a liquid outlet are connected with a pre-flushing liquid container in which pre-flushing liquid is stored; then the dialysis pumping unit is in a blood leading state, at the moment, the liquid inlet is connected with a dialysis outlet, and the liquid outlet is connected with a waste liquid recycling container; then the dialysis pumping unit is in a dialysis state, at the moment, the liquid inlet is connected with a dialysis outlet, and the liquid outlet is connected with a dialysis inlet; finally, the dialysis pump pressure unit is in a blood return state, at the moment, a liquid inlet is connected with a replacement liquid container loaded with replacement liquid, and a liquid outlet is connected with a dialysis inlet. According to the hemodialysis system, the purpose of improving the blood pumping quality can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of hemodialysis equipment, and in particular to a hemodialysis system. Background Art

[0002] Hemodialysis is a safe, easy and widely used blood purification method. It removes harmful and redundant metabolic waste and excess electrolytes from the human body by diffusion, thereby purifying the blood and correcting the balance of water, electrolytes and acid-base. Hemodialysis equipment is a medical device used to assist the human body in achieving hemodialysis. The most basic system of hemodialysis equipment is the blood pumping unit and the blood purification unit, which are used to complete the extracorporeal purification cycle of blood.

[0003] However, after conventional hemodialysis equipment pumps blood through the dialysate guiding pump, the dialysate used to guide the pump often enters the human body through the circulation pipeline, and the waste remaining in the dialysate at this time will also enter the blood and cause blood contamination; at the same time, when the dialysis is ended, due to the pumping principle, some blood often remains in the circulation pipeline and cannot be pumped into the human body, which easily causes blood waste.

[0004] In summary, how to improve the pumping quality of human blood is an urgent problem to be solved in the technical field of hemodialysis equipment. Summary of the invention

[0005] In order to solve the defect of poor quality when a hemodialysis device pumps human blood, the present invention provides a hemodialysis system.

[0006] The technical solution adopted by the present invention is a hemodialysis system, comprising a hemodialysis pump pressure unit, the hemodialysis pump pressure unit having a pre-flushing state, a blood drawing state, a hemodialysis state and a blood return state;

[0007] In the priming state, the liquid inlet and the liquid outlet of the dialysis pump pressure unit are both connected to the priming liquid container;

[0008] In the blood-drawing state, the liquid inlet is connected to the dialysis outlet, and the liquid outlet is connected to the waste liquid recovery container;

[0009] In the dialysis state, the liquid inlet is connected to the dialysis outlet, and the liquid outlet is connected to the dialysis inlet;

[0010] In the blood return state, the liquid inlet is connected to a replacement liquid container, and the liquid outlet is connected to a dialysis inlet.

[0011] Preferably, the priming liquid container is located above the dialysis pump pressure unit, and has a first priming liquid port and a second priming liquid port connected to the liquid outlet, the liquid inlet is connected to the inlet end of the three-way valve, and the first priming liquid port and the external environment are respectively connected to the two outlet ends of the three-way valve.

[0012] Preferably, the pre-flushing state includes a perfusion state and a flushing state;

[0013] In the perfusion state, the liquid inlet is connected to the outside through the three-way valve;

[0014] In the flushing state, the liquid inlet is connected to the first pre-flushing port through the three-way valve.

[0015] Preferably, the dialysis pump pressure unit comprises a dialyzer and a centrifugal pump which are interconnected, and the centrifugal pump is a magnetically suspended centrifugal pump.

[0016] Preferably, the pump outlet of the centrifugal pump is located at the upper side, and the angle formed between the axial direction of the centrifugal pump and the vertical direction ranges from 0 degrees to 90 degrees.

[0017] Preferably, the dialysis pump pressure unit is connected to a flow monitoring unit, and the flow monitoring unit works in the blood drawing state and the blood returning state to monitor the flow pumped out by the dialysis pump pressure unit.

[0018] Preferably, the liquid outlet of the dialysis pump pressure unit is connected to a bubble elimination unit;

[0019] The bubble elimination unit is a dialysis pot, and the dialysis pump pressure unit is connected to the dialysis inlet through the dialysis pot;

[0020] And / or, the bubble elimination unit is a mechanical debubbler, and the dialysis pump pressure unit is connected to the dialysis inlet via the mechanical debubbler.

[0021] Preferably, the liquid inlet is connected to the priming liquid container, the dialysis outlet and the replacement liquid container through a first multi-position valve, and the liquid outlet is connected to the priming liquid container, the waste liquid recovery container and the dialysis inlet through a second multi-position valve.

[0022] Preferably, the dialysis pump pressure unit is connected to a temperature control unit for maintaining temperature, and the temperature control unit operates in a pre-flushing state.

[0023] Preferably, the priming liquid container is connected to a negative pressure unit for generating negative pressure, and the negative pressure unit operates in a priming state.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present application discloses a hemodialysis system, including a dialysis pumping unit for blood purification and blood pumping, wherein the dialysis pumping unit has a pre-flushing state, a blood drawing state, a dialysis state and a blood return state, and the dialysis pumping unit has a liquid inlet and a liquid outlet. Before blood purification, the dialysis pumping unit is first placed in the pre-flushing state, at which time the liquid inlet and the liquid outlet are both connected to a pre-flushing liquid container storing a pre-flushing liquid, and the pre-flushing liquid can be poured into the dialysis pumping unit, so that the dialysis pumping unit can pump normally, and after the pump body is operated, the bubbles are cleared to realize the pre-flushing step; then the dialysis pumping unit is placed in the blood drawing state, at which time the liquid inlet is connected to the dialysis outlet, and the liquid outlet is connected to the waste liquid recovery container, and as the human body blood flows into the dialysis pumping unit, the pre-flushing liquid remaining in the dialysis pumping unit can be collected into the waste liquid recovery container without causing blood to flow out of the dialysis pumping unit. The residual priming fluid will enter the human body and cause blood contamination; then the dialysis pump pressure unit is placed in a dialysis state, at which time the liquid inlet is connected to the dialysis outlet, and the liquid outlet is connected to the dialysis inlet, so as to purify the human blood by dialysis; finally, the dialysis pump pressure unit is placed in a blood return state, at which time the liquid inlet is connected to a replacement fluid container loaded with replacement fluid, and the liquid outlet is connected to the dialysis inlet, as the replacement fluid flows into the dialysis pump pressure unit, the residual blood in the dialysis pump pressure unit will gradually flow into the human body, so that the human blood will not remain in the dialysis pump pressure unit, causing a waste of human blood. Therefore, the present application removes bubbles and rinses the dialysis pump pressure unit in the priming state, prevents the residual priming fluid from entering the human body and causing blood contamination in the blood in the blood-drawing state, and allows the human blood to flow back to the human body to the maximum extent in the blood return state, thereby improving the pumping quality of human hemodialysis from multiple directions and different angles with high quality.

[0026] Compared with the prior art, the hemodialysis system disclosed in the present application can achieve the purpose of improving the blood pumping quality when pumping human blood. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0028] Figure 1 A schematic structural diagram of a hemodialysis system provided according to an embodiment of the present invention is shown;

[0029] Figure 2 Shown according to Figure 1 A partially cutaway elevational view of an ion pump and mounting assembly in a provided hemodialysis system;

[0030] Figure 3 Shown according to Figure 2 A top view of an ion pump and mounting assembly in a hemodialysis system is provided.

[0031] Description of labels:

[0032] 10. Dialysis pump pressure unit; 11. Centrifugal pump; 12. Dialyzer; 13. Liquid inlet; 14. Liquid outlet;

[0033] 20. Pre-flushing liquid container; 21. First pre-flushing port; 22. Second pre-flushing port; 23. Three-way valve;

[0034] 30. Waste liquid recovery container;

[0035] 40. Replacement fluid container;

[0036] 50. Mounting assembly; 51. Pump mounting base plate; 52. Base; 53. Pump mounting seat; 54. First tightening hand wheel; 55. Second tightening hand wheel; 56. Bolt. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0038] The present invention discloses a hemodialysis system, please refer to Figure 1 , including a dialysis pump pressure unit 10, the dialysis pump pressure unit 10 has a pre-flushing state, a blood drawing state, a dialysis state and a blood return state;

[0039] In the priming state, the liquid inlet 13 and the liquid outlet 14 of the dialysis pump pressure unit 10 are both connected to the priming liquid container 20;

[0040] In the blood drawing state, the liquid inlet 13 is connected to the dialysis outlet, and the liquid outlet 14 is connected to the waste liquid recovery container 30;

[0041] In the dialysis state, the liquid inlet 13 is connected to the dialysis outlet, and the liquid outlet 14 is connected to the dialysis inlet;

[0042] In the blood return state, the liquid inlet 13 is connected to the replacement liquid container 40, and the liquid outlet 14 is connected to the dialysis inlet.

[0043] The dialysis pumping unit 10 has a pre-flushing state, a blood drawing state, a dialysis state and a blood return state, and the dialysis pumping unit 10 has a liquid inlet 13 and a liquid outlet 14. Before blood purification, the dialysis pumping unit 10 is first placed in the pre-flushing state, at which time the liquid inlet 13 and the liquid outlet 14 are both connected to a pre-flushing liquid container 20 storing a pre-flushing liquid, and the pre-flushing liquid can be poured into the dialysis pumping unit 10, so that the dialysis pumping unit 10 can be pumped normally, and after the pump body is operated, the bubbles are removed to implement the pre-flushing step; then the dialysis pumping unit 10 is placed in the blood drawing state, at which time the liquid inlet 13 is connected to the dialysis outlet, and the liquid outlet 14 is connected to the waste liquid recovery container 30, and as the human blood flows into the dialysis pumping unit 10, the pre-flushing liquid remaining in the dialysis pumping unit 10 can be collected in the waste liquid recovery container 30, and The residual priming liquid will not enter the human body and cause blood contamination; then the dialysis pump pressure unit 10 is placed in a dialysis state, at which time the liquid inlet 13 is connected to the dialysis outlet, and the liquid outlet 14 is connected to the dialysis inlet, so as to purify the human blood; finally, the dialysis pump pressure unit 10 is placed in a blood return state, at which time the liquid inlet 13 is connected to a replacement liquid container 40 loaded with replacement liquid, and the liquid outlet 14 is connected to the dialysis inlet, as the replacement liquid flows into the dialysis pump pressure unit 10, the residual blood in the dialysis pump pressure unit 10 will gradually flow into the human body, so that the human blood will not remain in the dialysis pump pressure unit 10, causing a waste of human blood. Therefore, the present application removes bubbles and rinses the dialysis pump pressure unit 10 through the pre-flushing state, avoids the residual priming liquid from entering the human body and causing blood contamination through the blood drawing state, and makes the human blood flow back to the human body to the maximum extent through the blood return state, so as to improve the pumping quality of human hemodialysis from multiple directions and different angles with high quality. Compared with the prior art, the hemodialysis system disclosed in the present application can achieve the purpose of improving the blood pumping quality when pumping human blood.

[0044] Specifically, the liquid inlet 13 and the liquid outlet 14 are both connected to the pre-flushing liquid container 20, and the setting of putting the dialysis pump pressure unit 10 in the pre-flushing state has the following purposes: first, to introduce the pre-flushing liquid into the dialysis pump pressure unit 10 so that the pump body of the dialysis pump pressure unit 10 can operate normally; second, to eliminate the bubbles in the dialysis pump pressure unit 10 to prevent the bubbles remaining in the dialysis pump pressure unit 10 from entering the human body and causing blood embolism; third, to eliminate the dust and pollutants in the dialysis pump pressure unit 10 to prevent contamination of the blood of the human body that needs dialysis.

[0045] The liquid inlet 13 is connected to the dialysis outlet, and the liquid outlet 14 is connected to the waste liquid recovery container 30. The setting of the dialysis pump pressure unit 10 in the blood-drawing state has the following purposes: first, to prevent the remaining undischarged priming liquid in the dialysis pump pressure unit 10 from entering the human body and causing a certain degree of contamination to the human blood; second, during the priming process, the priming liquid will adjust the flow rate of the priming liquid between the dialysis pump pressure unit 10 and the priming liquid container 20 according to the priming time, that is, the flow rate of the priming liquid is different from the flow rate of the subsequent dialyzed blood. Therefore, by setting the waste liquid recovery container 30, a buffering time can be added between the two links. On the one hand, it can prevent the dialysis pump pressure unit 10 from generating bubbles due to uneven flow rate, and on the other hand, it can purify the blood at the rated purification volume of the dialyzer 12 of the dialysis pump pressure unit 10 to improve the purification efficiency.

[0046] The liquid inlet 13 is connected to a replacement fluid container 40, and the liquid outlet 14 is connected to a dialysis inlet. The setting of the dialysis pump pressure unit 10 in a blood return state has the following purposes: first, it avoids the situation where part of the purified and dialyzed blood remains in the dialysis pump pressure unit 10 and does not return to the human body, thereby causing a waste of blood; second, when blood remains in the dialysis pump pressure unit 10, medical staff often pour the remaining blood into the sealing tape for treatment. During the treatment process, the exposure risk of medical staff increases sharply. If the blood remains in the dialysis pump pressure unit 10 for too long, it will cause blockage of the dialysis pump pressure unit 10 after coagulation, making it more difficult to clean it. The present application can reduce the exposure risk of medical staff and reduce the difficulty of cleaning the dialysis pump pressure unit 10 by setting a replacement fluid container 40.

[0047] In some embodiments, please refer to Figures 1 to 3 The priming liquid container 20 is located above the dialysis pump pressure unit 10, and has a first priming liquid port 21 and a second priming liquid port 22 connected to the liquid outlet 14. The liquid inlet 13 is connected to the inlet end of the three-way valve 23, and the first priming liquid port 21 and the external environment are respectively connected to the two outlet ends of the three-way valve 23.

[0048] Specifically, in the pre-flushing state, since the pre-flushing liquid container 20 is located above the dialysis pumping unit 10, when the liquid inlet 13 is connected to the external environment, the pre-flushing liquid in the pre-flushing liquid container 20 can be poured into the dialysis pumping unit 10 under the action of gravity, and the air in the dialysis pumping unit 10 can be easily discharged until the pre-flushing liquid reaches the position of the three-way valve 23. At this time, the liquid inlet 13 is connected to the first pre-flushing port 21, and the air between the three-way valve 23 and the pre-flushing liquid container 20 will also rise and be exhausted. This method uses gravity to perfuse the dialysis pumping unit 10, without flipping the dialyzer 12 in the dialysis pumping unit 10 to make it inverted, which is convenient for medical staff to carry out dialysis work. At the same time, the gravity perfusion method is relatively slow, so it is more effective in exhausting bubbles.

[0049] In some specific embodiments, the priming state includes a priming state and a flushing state;

[0050] In the perfusion state, the liquid inlet 13 is connected to the outside through the three-way valve 23;

[0051] In the flushing state, the liquid inlet 13 is connected to the first pre-flushing port 21 through the three-way valve 23 .

[0052] It should be noted that the normal liquid flow direction of the dialysis pump pressure unit 10 is to flow into the dialysis pump pressure unit 10 from the liquid inlet 13 and then flow out of the pump pressure unit from the liquid outlet 14. The priming state includes the perfusion state and the flushing state. In the two states, the priming liquid flows in opposite directions. For bubbles that cannot be normally removed in one direction, it is better to remove them from the other direction, thereby achieving a better effect of removing bubbles and cleaning pollutants.

[0053] In some more specific embodiments, the dialysis pump pressure unit 10 is connected to a peristaltic pump, and the setting of the peristaltic pump can speed up the priming and priming speed of the system.

[0054] In some embodiments, the dialysis pump pressure unit 10 includes a dialyzer 12 and a centrifugal pump 11 which are interconnected, and the centrifugal pump 11 is a magnetically suspended centrifugal pump 11 .

[0055] Specifically, in order to improve the quality of blood pumping, the present application targets the characteristics of pumping blood and selects a magnetic levitation centrifugal pump 11 that is frictionless and generates less heat to pump blood. At the same time, the magnetic levitation centrifugal pump 11 has less destructive effect on blood cells. Therefore, the use of the magnetic levitation centrifugal pump 11 can avoid the influence of temperature and damage to blood cells to the greatest extent.

[0056] Among them, please refer to Figure 2 and Figure 3The centrifugal pump 11 is installed on the frame through the mounting assembly 50. The centrifugal pump 11 can be retracted into the frame through the mounting assembly 50, and the centrifugal pump 11 can also be hung outside the frame through the mounting assembly 50. The mounting assembly 50 includes a base 52, a pump mounting base plate 51, a pump mounting seat 53, a bolt 56, a first tightening hand wheel 54 and a second tightening hand wheel 55. The base 52 is connected to the frame, the pump mounting base plate 51 is hinged on the base 52, the first tightening hand wheel 54 is threadedly connected to the pump mounting base plate 51, and the pump mounting base plate 51 can be prevented from moving relative to the base 52 or the frame by adjusting the first tightening hand wheel 54, the second tightening hand wheel 55 is threadedly connected to the pump mounting base plate 51, and the pump mounting seat 53 can be prevented from moving relative to the pump mounting base plate 51 by adjusting the second tightening hand wheel 55, and the bolt 56 penetrates the pump mounting seat 53 to install the centrifugal pump 11 on the pump mounting seat 53. In other embodiments, a universal arm can be selected as the mounting assembly 50.

[0057] In some specific embodiments, the centrifugal pump 11 is located below the dialyzer 12, so that the centrifugal pump 11 can provide sufficient power for the upper equipment.

[0058] In some specific embodiments, the pump outlet of the centrifugal pump 11 is located at the upper side, and the angle formed between the axial direction of the centrifugal pump 11 and the vertical direction ranges from 0 degrees to 90 degrees.

[0059] In order to enable the centrifugal pump 11 to operate better and pump a stable flow rate, the pump outlet of the centrifugal pump 11 is set on the upper side of the pump, and the centrifugal pump 11 does not have a large posture deviation in the vertical direction, so that the angle formed between the axial direction of the centrifugal pump 11 and the vertical direction is within a range of 0 degrees to 90 degrees.

[0060] In some embodiments, the dialysis pump pressure unit 10 is connected to a flow monitoring unit, and the flow monitoring unit works in the blood extraction state and the blood return state to monitor the flow pumped out by the dialysis pump pressure unit 10.

[0061] It should be noted that in order to enable the hemodialysis system to accurately collect the discharged priming fluid and input accurate replacement fluid, the present application also has a flow monitoring unit, which can monitor the liquid flow pumped by the dialysis pump pressure unit 10, so as to correctly judge the duration of the blood extraction state and the blood return state, so as to obtain higher quality blood pumping quality.

[0062] In some embodiments, the liquid outlet 14 of the dialysis pump pressure unit 10 is connected to a bubble elimination unit;

[0063] The bubble elimination unit is a dialysis pot, and the dialysis pump pressure unit 10 is connected to the dialysis inlet through the dialysis pot;

[0064] And / or, the bubble elimination unit is a mechanical debubbler, and the dialysis pump pressure unit 10 is connected to the dialysis inlet via the mechanical debubbler.

[0065] Among them, the bubble elimination unit is mainly used to eliminate bubbles, which can be achieved through a dialysis kettle or a mechanical defoamer, preferably a dialysis kettle, so as not to damage the blood cells in the blood. When specifically set up, one can be set at the dialysis outlet and the dialysis inlet.

[0066] In some embodiments, the liquid inlet 13 is connected to the priming liquid container 20, the dialysis outlet and the replacement liquid container 40 through a first multi-position valve, and the liquid outlet 14 is connected to the priming liquid container 20, the waste liquid recovery container 30 and the dialysis inlet through a second multi-position valve.

[0067] Specifically, in order to avoid bubbles that are easily generated during manual switching and contamination of the external environment, the hemodialysis system disclosed in the present application electrically switches and connects the priming liquid container 20, the dialysis outlet and the replacement liquid container 40 through a first multi-position valve, and electrically switches and connects the priming liquid container 20, the waste liquid recovery container 30 and the dialysis inlet through a second multi-position valve.

[0068] In some embodiments, the dialysis pump pressure unit 10 is connected to a temperature control unit for maintaining the temperature, and the temperature control unit operates in a pre-flushing state.

[0069] It should be noted that in order to cope with the dialysis environment with different temperatures and prevent the external temperature from affecting the normal temperature of the blood, a temperature control unit is provided to preheat the blood before hemodialysis to prevent the blood circulating in the extracorporeal circulation from being cooled by the overcooled pipeline. On the other hand, maintaining the temperature in the priming state can prevent the generation of bubbles that are easily caused in the priming state and when entering the blood drawing state due to uneven temperature.

[0070] In other embodiments, the temperature control unit works in the blood drawing state, the dialysis state and the blood drawing state in addition to the pre-flushing state, so as to maintain the temperature in the whole process of the hemodialysis system to prevent the blood from being overheated or overcooled, thereby affecting the pumping quality of the blood. In addition, the pipeline downstream of the temperature control unit is coated with a heat preservation material to prevent the temperature from changing again when passing through the pipeline.

[0071] In some embodiments, the priming liquid container 20 is connected to a negative pressure unit for generating negative pressure, and the negative pressure unit works in a priming state.

[0072] Specifically, the negative pressure unit connected to the pre-flushing liquid container 20 works in the pre-flushing state, and reduces the pressure, thereby causing the bubbles to expand and burst in the pre-flushing liquid. For some structural positions in the dialysis pump pressure where bubbles are difficult to remove, the bubbles at those locations can be easily eliminated through the setting of the negative pressure unit.

[0073] In the description of this specification, if the terms "embodiment one", "this embodiment", "in an embodiment" and the like appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the invention or at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example; moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in an appropriate manner.

[0074] In the description of this specification, the terms "connect", "install", "fix", "set", "have", etc. are all understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] In the description of this specification, relational terms such as "first" and "second" are used only 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 "comprises", "comprising" 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. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0076] The above description of the embodiments is to facilitate ordinary technicians in the technical field to understand and apply the technology of this case. People familiar with the technology in this field can obviously easily make various modifications to these examples and apply the general principles described here to other embodiments without creative work. Therefore, this case is not limited to the above embodiments. Modifications to the following situations should all be within the scope of protection of this case: ① A new technical solution implemented based on the technical solution of the present invention and combined with existing common knowledge, the technical effect produced by the new technical solution does not exceed the technical effect of the present invention; ② The equivalent replacement of some features of the technical solution of the present invention by using known technology, the technical effect produced is the same as the technical effect of the present invention; ③ The technical solution of the present invention can be expanded, and the substantive content of the expanded technical solution does not exceed the technical solution of the present invention; ④ The equivalent transformation made by using the contents of the description and drawings of the present invention is directly or indirectly applied to other related technical fields.

Claims

1. A hemodialysis system, characterized in that: It comprises a dialysis pump pressure unit, which has a pre-flushing state, a blood drawing state, a dialysis state and a blood return state; In the priming state, the liquid inlet and the liquid outlet of the dialysis pump pressure unit are both connected to a priming liquid container; In the blood-drawing state, the liquid inlet is connected to a dialysis outlet, and the liquid outlet is connected to a waste liquid recovery container; In the dialysis state, the liquid inlet is connected to the dialysis outlet, and the liquid outlet is connected to the dialysis inlet; In the blood return state, the liquid inlet is connected to a replacement liquid container, and the liquid outlet is connected to the dialysis inlet.

2. A hemodialysis system according to claim 1, characterized in that: The priming liquid container is located above the dialysis pump pressure unit, and has a first priming liquid container and a second priming liquid container connected to the liquid outlet, the liquid inlet is connected to the inlet end of the three-way valve, and the first priming liquid container and the external environment are respectively connected to the two outlet ends of the three-way valve.

3. A hemodialysis system according to claim 2, characterized in that: The pre-flushing state includes a perfusion state and a flushing state; In the perfusion state, the liquid inlet is connected to the outside through the three-way valve; In the flushing state, the liquid inlet is connected to the first pre-flushing port through the three-way valve.

4. A hemodialysis system according to claim 1, characterized in that: The dialysis pump pressure unit comprises a dialyzer and a centrifugal pump which are interconnected, and the centrifugal pump is a magnetically suspended centrifugal pump.

5. A hemodialysis system according to claim 4, characterized in that: The pump outlet of the centrifugal pump is located at the upper side, and the angle formed between the axial direction of the centrifugal pump and the vertical direction ranges from 0 degrees to 90 degrees.

6. A hemodialysis system according to any one of claims 1 to 5, characterized in that: The dialysis pump pressure unit is connected to a flow monitoring unit, and the flow monitoring unit works in the blood drawing state and the blood returning state to monitor the flow pumped out by the dialysis pump pressure unit.

7. A hemodialysis system according to any one of claims 1 to 5, characterized in that: The liquid outlet of the dialysis pump pressure unit is connected to a bubble elimination unit; The bubble elimination unit is a dialysis kettle, and the dialysis pump pressure unit is connected to the dialysis inlet through the dialysis kettle; And / or, the bubble elimination unit is a mechanical debubbler, and the dialysis pump pressure unit is connected to the dialysis inlet via the mechanical debubbler.

8. A hemodialysis system according to any one of claims 1 to 5, characterized in that: The liquid inlet is connected to the priming liquid container, the dialysis outlet and the replacement liquid container through a first multi-position valve, and the liquid outlet is connected to the priming liquid container, the waste liquid recovery container and the dialysis inlet through a second multi-position valve.

9. A hemodialysis system according to any one of claims 1 to 5, characterized in that: The dialysis pump pressure unit is connected to a temperature control unit for maintaining temperature, and the temperature control unit works in the priming state.

10. A hemodialysis system according to any one of claims 1 to 5, characterized in that: The priming liquid container is connected to a negative pressure unit for generating negative pressure, and the negative pressure unit works in the priming state.

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