A continuous blood purification device

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a continuous blood purification device, which includes: a filtering part, including a blood inlet filter tube, a blood filter machine inlet blood tube, a filtering pump, a blood filter machine, a blood filter machine return blood tube and a return blood filter tube arranged on one side; a connecting part, including a hose, a first connecting port, a measuring port and a second connecting port; the first connecting port and the second connecting port are respectively located at the two ends of the hose; the measuring port is connected in series inside the hose; the hose is connected to the blood inlet filter tube and the blood filter machine inlet blood tube at the same time through the first connecting port; the hose is connected to the blood filter machine return blood tube and the return blood filter tube at the same time through the second connecting port; a control part, including a pressure meter and a controller connected by a wire; the pressure meter and the measuring port are detachably connected; the controller is sleeved on the outside of the hose and is located between the measuring port and the second connecting port; a limiter is provided inside the controller; the limiter can selectively clamp the hose.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a continuous blood purification device. Background Art

[0002] Continuous blood purification is a new blood purification method. It uses a continuous blood purification therapy that lasts 24 hours or nearly 24 hours a day to replace the purification method of damaged kidney function. It is one of the most commonly used blood purification technologies in critical care. It imitates the filtration principle of the glomerulus and achieves the purpose of solute removal through two methods: convection and diffusion. Arterial or venous blood is introduced into a semipermeable membrane filter with good permeability. The water in the plasma and the small and medium molecular weight solutes dissolved therein are removed by convection, that is, the purpose of removing water and solutes is achieved by the pressure gradient on both sides of the semipermeable membrane. Substances smaller than the pores of the filter membrane are filtered out, and at the same time, substances needed by the body are introduced into the body in the form of replacement fluid to maintain the stability of the internal environment.

[0003] During continuous blood purification treatment, the proper functioning of the machine is crucial for smooth progress. The machine's monitoring system ensures patient safety during treatment. When abnormalities occur during treatment, the machine alerts medical staff with an alarm. However, frequent alarms can interrupt treatment, causing the blood pump to stop functioning and blood to remain outside the patient's body. This increases the risk of coagulation events, and in severe cases, can even threaten the patient's life.

[0004] Continuous blood purification system alarms are primarily caused by pressure, balance, air bubbles, and blood leakage. Pressure alarms are the most common of these alarms. The primary cause of pressure alarms is insufficient blood flow. Therefore, preventing continuous blood purification alarms, especially those caused by poor blood flow at the blood draw point, is crucial.

[0005] In view of the above problems, the present invention provides a continuous blood purification device. Summary of the Invention

[0006] In order to overcome the problems mentioned in the background art, the present invention provides a continuous blood purification device.

[0007] A continuous blood purification device, comprising:

[0008] The filtration unit includes a blood inlet filter tube, a blood filter inlet blood tube, a filtration pump, a blood filter, a blood filter return blood tube, and a return blood filter tube; one end of the filtration pump is connected to the blood inlet filter tube via the blood filter inlet blood tube, and the other end is connected to the blood filter via a catheter; the end of the blood filter away from the filtration pump is connected to the return blood filter tube via the blood filter return blood tube;

[0009] The connecting portion includes a hose, a first connecting port, a measuring port, and a second connecting port; the first connecting port and the second connecting port are respectively located at two ends of the hose; the measuring port is connected in series inside the hose; the hose is connected to both the blood inlet filter tube and the blood inlet blood vessel of the hemofiltration machine through the first connecting port; the hose is connected to both the blood return blood vessel of the hemofiltration machine and the blood return filter tube through the second connecting port;

[0010] The control unit includes a pressure gauge and a controller connected by a wire; the pressure gauge is detachably connected to the measuring port; the controller is sleeved on the outside of the hose and located between the measuring port and the second connection port; a limiter is provided inside the controller; the limiter can selectively clamp the hose.

[0011] Furthermore, the connecting portion further includes a first auxiliary port; the first auxiliary port is connected in series to the hose; and the first auxiliary port is located between the first connecting port and the measuring port.

[0012] Preferably, the filter unit includes a first pump; and the first connection port is detachably connected to the first pump.

[0013] Preferably, the first pumping device includes a first pumping tube, a first liquid pump, and a first pumping wire; one end of the first liquid pump is connected to the first auxiliary port through the first pumping tube, and the other end is connected to the controller through the first pumping wire.

[0014] Preferably, a first pumping connector is provided at one end of the first pumping wire away from the first liquid pump; a first pumping interface is provided on the controller; and the first pumping connector is detachably connected to the first pumping interface.

[0015] Preferably, the first auxiliary port is a three-way valve.

[0016] Furthermore, the connecting portion further includes a second auxiliary port; the second auxiliary port is connected in series to the hose; and the second auxiliary port is located between the second connecting port and the measuring port.

[0017] Preferably, the filter unit includes a second pump; and the second connection port is detachably connected to the second pump.

[0018] Preferably, the second pumping device includes a second pumping tube, a second liquid pump, and a second pumping wire; one end of the second liquid pump is connected to the second auxiliary port through the second pumping tube, and the other end is connected to the controller through the second pumping wire.

[0019] Preferably, the second pumping lead is provided with a second pumping connector at one end away from the second liquid pump; the controller is provided with a second pumping interface; the second pumping connector is detachably connected to the second pumping interface.

[0020] Preferably, the second auxiliary port is a three-way valve.

[0021] Furthermore, the controller includes a shell and a limit member; the shell and the limit member are detachably connected; a first mounting groove is provided on the side of the shell facing the limit member; a second mounting groove is provided on the side of the limit member facing the shell; when the limit member is installed on the shell, the first mounting groove and the second mounting groove are spliced ​​into a channel.

[0022] Preferably, the limiter is located inside the housing.

[0023] Preferably, the hose passes through the controller via a channel.

[0024] Furthermore, the controller further includes a display and buttons; the display and buttons are both arranged on the side wall of the shell.

[0025] Preferably, the buttons include one or more of a power button, a reset button, and a control button.

[0026] Preferably, the controller further includes an alarm; the alarm is arranged on the side wall of the shell.

[0027] Preferably, the button also includes a mute button.

[0028] Furthermore, the pressure gauge includes a pressure gauge, a pressure measuring port and a pressure measuring wire; the pressure gauge is connected to the measuring port through the pressure measuring port; and the pressure gauge is connected to the controller through the pressure measuring wire.

[0029] Preferably, a pressure measuring interface is provided on the housing; a pressure measuring connector is provided at one end of the pressure measuring wire away from the pressure gauge; and the pressure measuring connector is detachably connected to the pressure measuring interface.

[0030] Furthermore, a power interface is provided on the shell.

[0031] Furthermore, the first connection port, the measuring port and the second connection port are all three-way valves.

[0032] Furthermore, the limiter includes a pressing block, a push rod and a motor; the motor drives the push rod to drive the pressing block to move.

[0033] Preferably, the moving direction of the push rod is perpendicular to the axis of the channel.

[0034] Furthermore, the blood filter is provided with a liquid inlet pipe and a liquid outlet pipe.

[0035] Beneficial effects of the present invention:

[0036] 1. When in use, connect the first connection port to the blood inlet filter tube and the blood filter machine blood inlet blood tube, and connect the second connection port to the return blood filter tube and the blood filter machine return blood tube. At this time, the measuring port is located between the first connection port and the control unit. Connect the manometer to the measuring port to obtain blood inlet flow information by measuring the blood pressure at the blood inlet end; when the blood flow is sufficient, the limiter clamps the hose; when the manometer detects that the blood flow is insufficient, the limiter loosens the hose, allowing the filtered blood to flow again through the hose to the blood filter machine blood inlet end and into the interior of the blood filter, preventing the blood filter machine from stopping, maintaining the continuity of treatment, avoiding interruption of the treatment process, reducing the risk of extracorporeal coagulation, improving treatment efficiency, and relatively reducing nursing workload.

[0037] 2. When the manometer detects insufficient blood flow, the control unit will issue an alarm to prompt medical staff to come and deal with it.

[0038] 3. Use the first pump and the second pump to inject anticoagulant drugs or normal saline into the hose through the first auxiliary port and the second auxiliary port respectively, to flush the hose and further prevent blood coagulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a three-dimensional diagram of a continuous blood purification device implementing the present invention;

[0040] Figure 2 A top view of a continuous blood purification device implementing the present invention;

[0041] Figure 3 A front view of a controller implementing the present invention;

[0042] Figure 4 for Figure 3 AA sectional view;

[0043] Figure 5 A rear view of a controller implementing the present invention;

[0044] Figure 6 is a perspective view of a pressure gauge implementing the present invention;

[0045] Figure 7 is a perspective view of another continuous blood purification device implementing the present invention;

[0046] Figure 8 A top view of another continuous blood purification device implementing the present invention;

[0047] Figure 9 A rear view of another controller implementing the present invention;

[0048] Figure 10 A perspective view of a pump implementing the present invention;

[0049] In the figure, 1. connection unit; 2. control unit; 3. filter unit; 4. first pump; 11. first connection port; 12. measurement port; 13. second connection port; 14. first auxiliary port; 15. second auxiliary port; 21. pressure gauge; 22. controller; 23. limiter; 24. power supply interface; 25. pump interface; 31. blood inlet filter tube; 32. blood filter tube; 33. filter pump; 34. blood filter; 35. blood filter return tube; 36. blood return filter tube; 41. first pump inlet tube; 42. First liquid pump; 43. First pump inlet wire; 431. First pump inlet connector; 211. Pressure gauge; 212. Pressure measuring connector; 213. Pressure measuring port; 214. Pressure measuring wire; 221. Display; 222. Alarm; 223. Pressure measuring interface; 224. Reset button; 225. Mute button; 226. Control button; 227. Housing; 228. Limiting member; 229. Power button; 231. Pressure block; 232. Push rod; 233. Motor; 341. Liquid inlet pipe; 342. Liquid discharge pipe. DETAILED DESCRIPTION

[0050] 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, rather than all the embodiments. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0053] The present invention provides a blood purification device which automatically connects a hose and performs circulation when the blood drawing pressure at the blood drawing end reaches a certain pressure during treatment, thereby preventing the filter pump from stopping, alleviating the problem of insufficient blood drawing, and reducing the occurrence of coagulation events.

[0054] Example 1

[0055] like Figure 1-6 A continuous blood purification device is shown, comprising:

[0056] The filter unit 3 includes a blood inlet filter tube 31, a blood filter inlet blood tube 32, a filter pump 33, a blood filter 34, a blood filter return blood tube 35, and a blood return filter tube 36. One end of the filter pump 33 is connected to the blood inlet filter tube 31 via the blood filter inlet blood tube 32, and the other end is connected to the blood filter 34 via a catheter. The end of the blood filter 34 away from the filter pump 33 is connected to the blood return filter tube 36 via the blood filter return blood tube 35.

[0057] The connecting portion 1 includes a flexible tube, a first connecting port 11, a measuring port 12, and a second connecting port 13. The first connecting port 11 and the second connecting port 13 are located at either end of the flexible tube; the measuring port 12 is connected in series within the flexible tube. The flexible tube is connected to both the blood inlet filter tube 31 and the blood filter inlet tube 32 via the first connecting port 11. The flexible tube is connected to both the blood filter return tube 35 and the blood return filter tube 36 via the second connecting port 13.

[0058] The control unit 2 includes a pressure gauge 21 and a controller 22 connected by a wire; the pressure gauge 21 is detachably connected to the measuring port 12; the controller 22 is mounted on the outside of the hose and is located between the measuring port 12 and the second connection port 13; a limiter 23 is provided inside the controller 22; the limiter 23 can optionally clamp the hose.

[0059] During use, the blood inlet filter tube 31 and the blood return filter tube 36 are inserted into the patient's blood vessels, so that the patient's blood enters the filtering part 3 through the blood inlet filter tube 31, and the blood filtered by the blood filter 34 returns to the patient's blood vessels through the blood return filter tube 36.

[0060] Specifically, the first connection port 11, the measurement port 12, and the second connection port 13 are all three-way valves. One end of each of the first and second connection ports 11, 13 is connected to a hose. Both ends of the measurement port 12 are connected to a hose, and the third port is detachably connected to the pressure gauge 21.

[0061] During use, first pre-flushed the connector 1 with saline, then connected the first connection port 11 to the blood inlet end of the hemofiltration tube and the blood filter 34, and connected the second connection port 13 to the blood return end of the hemofiltration tube and the blood filter 34. The control unit 2 is then placed on the outside of the flexible tube, positioned between the measurement port 12 and the second connection port 13. The measurement port 12 is now positioned between the first connection port 11 and the control unit 2. Connecting the pressure gauge 21 to the measurement port 12 allows blood flow information to be obtained by measuring blood pressure at the blood inlet end.

[0062] The measuring port 12 is located between the first connection port 11 and the control unit 2. By connecting the manometer 21 to the measuring port 12, the blood flow information can be obtained by measuring the blood pressure at the blood drawing end; when the blood flow is sufficient, the limiter 23 clamps the hose; when the manometer 21 detects that the blood flow is insufficient, the limiter 23 loosens the hose, allowing the filtered blood to flow again through the hose to the blood drawing end of the blood filter 34 and enter the interior of the blood filter 34, preventing the blood filter 34 from stopping, maintaining the continuity of treatment, avoiding interruption of the treatment process, reducing the risk of extracorporeal coagulation, improving treatment efficiency, and relatively reducing the nursing workload.

[0063] In some embodiments of the present application, the controller 22 includes a shell 227 and a limit member 228; the shell 227 and the limit member 228 are detachably connected; a first mounting groove is provided on the side of the shell 227 facing the limit member 228; a second mounting groove is provided on the side of the limit member 228 facing the shell 227; when the limit member 228 is installed on the shell 227, the first mounting groove and the second mounting groove are spliced ​​into a channel.

[0064] The restrictor 23 is located inside the housing 227. When in use, the hose is passed through the controller 22 via the passage, with the restrictor 23 now facing the hose.

[0065] In the exemplary embodiment of the present application, the restrictor 23 includes a pressure block 231, a push rod 232, and a motor 233. The motor 233 drives the push rod 232 to move the pressure block 231. The movement direction of the push rod 232 is perpendicular to the axis of the channel to ensure that the pressure block 231 can completely clamp the hose when driven by the motor 233.

[0066] Specifically, the push rod 232 is a screw; the pressing block 231 is rotatably connected to the push rod 232, and the motor 233 rotates to drive the push rod 232 to move along its own axis.

[0067] Furthermore, the controller 22 further includes a display 221 and buttons, which are both disposed on the sidewalls of the housing 227. The posture of the controller 22 can be adjusted by pressing the buttons.

[0068] Specifically, the buttons include one or more of a power button 229, a reset button 224, and a control button 226. The power button 229 can turn on or off the controller 22. The reset button 224 can reset the limiter 23. The control button 226 can adjust the critical value of the alarm.

[0069] In some examples of the present application, the controller 22 further includes an alarm 222, which is disposed on a side wall of the housing 227. When the pressure gauge 21 detects insufficient blood flow, the controller 2 activates the alarm 222 to sound an alarm, prompting medical personnel to come and handle the situation.

[0070] Specifically, the alarm 222 issues an alarm by sound, light off, etc.

[0071] Preferably, the button further includes a mute button 225. The mute button 225 can cancel the alarm of the alarm 222.

[0072] In the specific example of the present application, the pressure gauge 21 includes a pressure gauge 211, a pressure measuring port 213, and a pressure measuring wire 214. During use, the pressure gauge 211 is connected to the measuring port 12 via the pressure measuring port 213; the pressure gauge 211 is connected to the controller 22 via the pressure measuring wire 214. The pressure gauge 211 can then sense the pressure in the blood drainage filter tube 31, thereby measuring the amount of blood drawn, and transmit the blood drainage amount data to the controller 22 via the pressure measuring wire 214.

[0073] Preferably, a pressure measuring interface 223 is provided on the housing 227 ; a pressure measuring connector 212 is provided at one end of the pressure measuring wire 214 away from the pressure gauge 211 ; and the pressure measuring connector 212 is detachably connected to the pressure measuring interface 223 .

[0074] Furthermore, a power interface 24 is provided on the housing 227. When in use, the power cord is plugged into the power interface 24 to provide energy for the controller 22 and the pressure sensor 21.

[0075] In the exemplary embodiment of the present application, the hemofiltration machine 34 is provided with an inlet pipe 341 and a drain pipe 342. Clean dialysate enters the hemofiltration machine 34 through the inlet pipe 341, and used dialysate leaves the hemofiltration machine 34 through the drain pipe 342.

[0076] Preferably, the direction in which the dialysate enters the hemofiltration machine 34 is opposite to the direction in which the blood enters the hemofiltration machine 34 .

[0077] The operating principle of this embodiment:

[0078] When the pressure inside the blood filter tube 31 monitored by pressure gauge 211 is normal, the blood flow is within the normal range. At this point, restrictor 23 clamps the flexible tube, and the patient's blood flows through the blood filter tube 31, the blood filter inlet tube 32, and the filter pump 33, then enters the blood filter 34 for filtration. The filtered blood then flows through the blood filter return tube 35 and the return blood filter tube 36 and returns to the patient's blood vessels.

[0079] When the pressure gauge 211 detects an abnormal pressure inside the blood filter tube 31, indicating that the blood flow volume is below the normal range, the restrictor 23 releases the hose, temporarily connecting the blood filter inlet tube 32 and the blood filter return tube 35 under the hose's guidance. The filtered blood then returns to the blood filter inlet tube 32 through the hose for further filtration, and the alarm 222 alerts the medical staff. This design prevents the filtration pump 33 from stalling. Specifically, when the blood flow volume is low, the filtered blood is re-drawn into the blood filter inlet tube 32, maintaining the filtration pump 33 in normal operation and preventing blood from clotting inside the filter section 3. After medical staff have treated the patient and restored the blood flow volume to the normal range, they activate the restrictor 23 to close the hose, resuming the original filtration mode. The patient's blood then enters the filter section 3 through the blood filter tube 31, and the filtered blood returns to the patient's blood vessels through the return tube 36.

[0080] Example 2

[0081] like Figure 7-10 As shown, the difference between this embodiment and embodiment 1 is that:

[0082] The connecting portion 1 also includes a first auxiliary port 14; the first auxiliary port 14 is connected in series to the hose; the first auxiliary port 14 is located between the first connecting port 11 and the measuring port 12; when in use, liquid medicines such as anticoagulants or saline can be injected through the first auxiliary port 14 to further prevent blood coagulation.

[0083] Preferably, the filter unit 3 includes a first pump 4; the first connection port 11 is detachably connected to the first pump 4. This design allows the controller 22 to control the opening and closing of the first pump 4, thereby automatically injecting liquid medicine into the hose through the first auxiliary port 14.

[0084] Specifically, the first pump 4 includes a first pumping tube 41, a first liquid pump 42, and a first pumping wire 43; one end of the first liquid pump 42 is connected to the first auxiliary port 14 through the first pumping tube 41, and the other end is connected to the controller 22 through the first pumping wire 43.

[0085] Preferably, in order to facilitate disassembly and cleaning, a first pumping connector 431 is provided at one end of the first pumping wire 43 away from the first liquid pump 42; a first pumping interface 25 is provided on the controller 22; and the first pumping connector 431 is detachably connected to the first pumping interface 25;

[0086] Preferably, the first auxiliary port 14 is a three-way valve, so that the first auxiliary port 14 can be used selectively.

[0087] The connecting portion 1 also includes a second auxiliary port 15; the second auxiliary port 15 is connected in series to the hose; the second auxiliary port 15 is located between the second connecting port 13 and the measuring port 12; when in use, liquid medicines such as anticoagulants or saline can be injected through the second auxiliary port 15 to further prevent blood coagulation.

[0088] Preferably, the filter unit 3 includes a second pump; the second connection port 13 is detachably connected to the second pump. This design is intended to enable the controller 22 to control the opening and closing of the second pump, thereby automatically injecting liquid medicine into the hose through the second auxiliary port 15.

[0089] Specifically, the second pumping device includes a second pumping tube, a second liquid pump, and a second pumping wire; one end of the second liquid pump is connected to the second auxiliary port 15 through the second pumping tube, and the other end is connected to the controller 22 through the second pumping wire.

[0090] Preferably, in order to facilitate disassembly and cleaning, a second pumping connector is provided at one end of the second pumping wire away from the second liquid pump; a second pumping interface 25 is provided on the controller 22; and the second pumping connector is detachably connected to the second pumping interface 25;

[0091] Preferably, the second auxiliary port 15 is a three-way valve, so that the second auxiliary port 15 can be used selectively.

[0092] The first pump 4 and the second pump are used to inject anticoagulant drugs or physiological saline into the interior of the hose through the first auxiliary port 14 and the second auxiliary port 15 respectively, so as to further prevent blood coagulation while flushing the hose.

[0093] The operating principle of this embodiment:

[0094] When the pressure inside the blood filter tube 31 monitored by the pressure gauge 211 is normal, the blood draw volume is within the normal range. At this time, the restrictor 23 clamps the hose, and the patient's blood enters the filter unit 3 through the blood filter tube 31 for filtration. The filtered blood returns to the patient's blood vessels through the blood filter tube 36.

[0095] When the pressure gauge 211 monitors that the internal pressure of the blood filter tube 31 is abnormal, the blood draw volume is lower than the normal range. At this time, the limiter 23 loosens the hose, so that the blood filter machine inlet blood tube 32 and the blood filter machine return blood tube 35 are temporarily connected under the guidance of the hose, and the filtered blood is re-absorbed into the blood filter machine inlet blood tube 32, maintaining the filter pump 33 in a normal operating state to prevent blood from coagulating inside the filter part 3. After the medical staff handles it, when the blood draw volume returns to the normal range, the first pump 4 and the second pump can be used to inject anticoagulants or saline into the hose through the first auxiliary port 14 and the second auxiliary port 15 respectively, and the hose is flushed to complete the tube sealing. Then the limiter 23 is driven to clamp the hose, restore the original filtering mode, and continue to filter the patient's blood.

[0096] Throughout this specification, reference to terms such as "embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," and "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0097] The embodiments described in this application are only some of the embodiments of the present invention, rather than all of the embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A continuous blood purification device, characterized in that: It includes: The filtration part includes a blood inlet filter tube, a blood filter inlet tube, a filtration pump, a blood filter, a blood filter return tube and a blood return filter tube connected in sequence; The connecting portion includes a hose, a first connecting port, a measuring port, and a second connecting port; the first connecting port and the second connecting port are respectively located at two ends of the hose; the measuring port is connected in series inside the hose; the hose is connected to both the blood inlet filter tube and the blood inlet blood vessel of the hemofiltration machine through the first connecting port; the hose is connected to both the blood return blood vessel of the hemofiltration machine and the blood return filter tube through the second connecting port; The control unit includes a pressure gauge and a controller connected by a wire; the pressure gauge is detachably connected to the measuring port; the controller is sleeved on the outside of the hose and located between the measuring port and the second connection port; a limiter is provided inside the controller; When the blood flow rate is higher than a predetermined value, the restrictor clamps the hose; when the blood flow rate is lower than a predetermined value, the restrictor releases the hose, allowing the filtered blood to flow through the hose again to the blood inlet end of the blood filter and enter the interior of the blood filter, preventing the blood filter from stopping.

2. A continuous blood purification device according to claim 1, characterized in that: The connecting portion further includes a first auxiliary port; the first auxiliary port is connected in series to the hose; and the first auxiliary port is located between the first connecting port and the measuring port.

3. A continuous blood purification device according to claim 2, characterized in that: The filter unit includes a first pump; the first connection port is detachably connected to the first pump.

4. A continuous blood purification device according to claim 3, characterized in that: The first pumping device includes a first pumping tube, a first liquid pump, and a first pumping wire; one end of the first liquid pump is connected to the first auxiliary port through the first pumping tube, and the other end is connected to the controller through the first pumping wire.

5. A continuous blood purification device according to claim 4, characterized in that: A first pumping connector is provided at one end of the first pumping wire away from the first liquid pump; a first pumping interface is provided on the controller; and the first pumping connector is detachably connected to the first pumping interface.

6. A continuous blood purification device according to claim 5, characterized in that: The first auxiliary port is a three-way valve.

7. The continuous blood purification device according to claim 1, characterized in that: The connecting portion further includes a second auxiliary port; the second auxiliary port is connected in series to the hose; and the second auxiliary port is located between the second connecting port and the measuring port.

8. A continuous blood purification device according to claim 7, characterized in that: The filter unit includes a second pump; the second connection port is detachably connected to the second pump.

9. A continuous blood purification device according to claim 8, characterized in that: The second pumping device includes a second pumping tube, a second liquid pump, and a second pumping wire; one end of the second liquid pump is connected to the second auxiliary port through the second pumping tube, and the other end is connected to the controller through the second pumping wire.

10. A continuous blood purification device according to claim 9, characterized in that: A second pumping connector is provided at one end of the second pumping wire away from the second liquid pump; a second pumping interface is provided on the controller; and the second pumping connector is detachably connected to the second pumping interface.

11. A continuous blood purification device according to claim 10, characterized in that: The second auxiliary port is a three-way valve.

12. The continuous blood purification device according to claim 1, characterized in that: The controller includes a shell and a limit member; the shell and the limit member are detachably connected; a first mounting groove is provided on the side of the shell facing the limit member; a second mounting groove is provided on the side of the limit member facing the shell; when the limit member is installed on the shell, the first mounting groove and the second mounting groove are spliced ​​into a channel.

13. A continuous blood purification device according to claim 12, characterized in that: The restrictor is located inside the housing.

14. A continuous blood purification device according to claim 13, characterized in that: The hose passes through the controller via a channel.

15. The continuous blood purification device according to claim 14, characterized in that: The controller further comprises a display and buttons; the display and buttons are both arranged on the side wall of the shell.

16. A continuous blood purification device according to claim 15, characterized in that: The buttons include one or more of a power button, a reset button, and a control button.

17. A continuous blood purification device according to claim 16, characterized in that: The controller further comprises an alarm; the alarm is arranged on the side wall of the shell.

18. The continuous blood purification device according to claim 17, characterized in that: The buttons also include a mute button.

19. The continuous blood purification device according to claim 14, characterized in that: The pressure gauge includes a pressure gauge, a pressure measuring port and a pressure measuring wire; the pressure gauge is connected to the measuring port through the pressure measuring port; and the pressure gauge is connected to the controller through the pressure measuring wire.

20. The continuous blood purification device according to claim 19, characterized in that: The housing is provided with a pressure measuring interface; the end of the pressure measuring wire away from the pressure gauge is provided with a pressure measuring joint; the pressure measuring joint is detachably connected to the pressure measuring interface.

21. The continuous blood purification device according to claim 14, characterized in that: The shell is provided with a power interface.

22. The continuous blood purification device according to claim 14, characterized in that: The first connection port, the measuring port and the second connection port are all three-way valves.

23. The continuous blood purification device according to claim 14, characterized in that: The limiter includes a pressing block, a push rod and a motor; the motor drives the push rod to drive the pressing block to move.

24. A continuous blood purification device according to claim 23, characterized in that: The moving direction of the push rod is perpendicular to the axis of the channel.

25. The continuous blood purification device according to claim 14, characterized in that: The blood filter is provided with a liquid inlet pipe and a liquid outlet pipe.

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