A blood exchange device fluid bag connecting tube

Abstract

This invention provides a fluid bag connecting tube for a blood exchange device. The connecting tube includes: a connecting tube body, connecting two fluid bags and a blood exchange device; the connecting tube body includes: a tube body, fixedly connected to the blood exchange device; two branch tubes, one end of each branch tube fixedly connected to the tube body, and the other end of each branch tube connected to a fluid bag or the tube body of another connecting tube body; a control module for controlling the connection and disconnection of the branch tubes based on a flow rate value, including: a flow meter fixed to the end of the branch tube furthest from the tube body for real-time flow rate detection; a solenoid valve fixed to the end of the branch tube furthest from the tube body and downstream of the flow meter for controlling the connection and disconnection of the branch tubes; a control unit for controlling the opening and closing of the solenoid valve; and a processing unit that processes the flow rate value and a preset flow threshold to obtain a control signal to control the control unit and drive the solenoid valve to open and close. The beneficial effect is to extend the fluid bag replacement cycle and reduce the frequency of fluid bag replacement.

Description

Technical Field

[0001] This invention relates to the technical field of medical devices, and more particularly to a fluid bag connecting tube for a blood exchange device. Background Technology

[0002] Continuous renal replacement therapy is a blood purification treatment technique that continuously and slowly removes water and solutes through extracorporeal blood circulation. It is used in the clinical treatment of patients with acute renal failure, autoimmune diseases, hepatic encephalopathy, and other diseases.

[0003] Currently, during blood exchange, whole blood is drawn from the body and separated into plasma and cellular components. The patient's plasma is discarded, and then fresh plasma, albumin solution, balanced electrolyte solution, or other plasma substitutes are reinfused into the patient at the same rate. To ensure blood supply, medical staff need to replenish plasma substitutes promptly. When plasma substitutes are stored in fluid bags, these bags need to be changed frequently to ensure timely supply during blood exchange. A drawback exists: if medical staff fail to change the fluid bags in a timely manner, plasma can coagulate inside the connecting tube between the fluid bag and the blood exchange machine, leading to treatment failure. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a fluid bag connecting tube for a blood exchange device, wherein the fluid bag connecting tube is respectively connected to a blood exchange device and at least two fluid bags, and the fluid bag connecting tube includes:

[0005] A connecting tube body, which connects to the two liquid bags and the blood replacement device respectively, comprises:

[0006] The tube body is fixedly connected to the blood exchange device via a connector;

[0007] Two branch pipes, one end of each branch pipe is fixedly connected to one end of the pipe body, and the other end of each branch pipe is connected to the liquid bag or the end of the pipe body on another connecting pipe body that is away from the other branch pipe;

[0008] The control module is used to control the connection and disconnection of the branch pipe according to a flow value in the branch pipe, including:

[0009] A flow meter, fixed to the end of the branch pipe away from the main pipe, is connected to both the liquid bag and the branch pipe, and is used to detect the flow rate in real time.

[0010] A solenoid valve, fixed to the end of the branch pipe away from the pipe body and located downstream of the flow meter, is used to control the connection and disconnection of the branch pipe.

[0011] The control unit is connected to the solenoid valve to control its opening and closing, thereby enabling the connection and disconnection of the branch pipe.

[0012] The processing unit is connected to the control unit and processes the flow rate value and a preset flow rate threshold to obtain a control signal to control the control unit to drive the solenoid valve to open and close.

[0013] Preferably, the tube body is connected to an insertion cannula via the connector, and the end of the insertion cannula away from the tube body is connected to the blood replacement device. The connector includes:

[0014] A terminal is fixed to the end of the tube body away from the branch tube and inserted into the insertion tube. The terminal has a through hole along its length, and the through hole passes through the terminal to communicate with the tube body.

[0015] A positioning ring is sleeved on the terminal and threaded to the insertion tube, and the positioning ring is rotatably connected to the terminal.

[0016] Preferably, the cannula is provided with a positive pressure device for generating a positive pressure environment at the end of the cannula connected to the tube body, the positive pressure device comprising:

[0017] A rotating seat has a first chamber, and the terminal is inserted into the first chamber. A first adjustment hole is provided on the bottom wall of the rotating seat near the insertion tube. The first adjustment hole is connected to the first chamber and is offset from the axis of the rotating seat.

[0018] A connecting seat has a second chamber. One end of the connecting seat is rotatably connected to the rotating seat, and the other end is connected to the insertion tube. A second adjustment hole is provided on the bottom wall of the connecting seat near the rotating seat. The second adjustment hole is coaxially arranged with the first adjustment hole to connect the first chamber and the second chamber.

[0019] Inflatable components, including:

[0020] The airbag is circumferentially fixed to the outer wall of the rotating seat and communicates with the first chamber.

[0021] An inflation line is connected to the airbag. After the airbag is inflated through the inflation line, the gas inside the airbag flows into the first chamber.

[0022] An inflation device is connected to the control unit and the inflation line respectively. The processing unit outputs a positive pressure signal according to the connection status of the insertion tube and the tube body. The control unit drives the inflation device to open and close according to the positive pressure signal.

[0023] Preferably, the rotating seat and the connecting seat are rotatably connected by a rotating ring. One end of the rotating ring is sleeved on the rotating seat, and the other end of the rotating ring is fixed to the connecting seat. A limiting ring is provided at the end of the rotating ring away from the insertion tube, and a limiting groove is provided circumferentially on the rotating seat for the limiting ring to engage.

[0024] Preferably, a plurality of positioning blocks are evenly distributed circumferentially on the outer wall of the rotating seat, and at least one positioning groove is provided on the inner wall of the rotating ring for the positioning blocks to engage.

[0025] Preferably, the inner wall of the first chamber is provided with a coating made of a hydrophilic material.

[0026] Preferably, the end of the terminal away from the tube body is tapered, and an elastic membrane is fixed in the first cavity. The elastic membrane has a socket for inserting the terminal.

[0027] One end of the through hole is connected to a conical surface of the terminal, and the other end of the through hole is connected to the tube body.

[0028] The socket is closed to isolate the first chamber from an external environment; when the terminal is inserted through the elastic membrane, the socket expands accordingly, and the conical surface is located on the side of the elastic membrane near the connector so that the through hole communicates with the first chamber.

[0029] Preferably, a sleeve is provided at the end of the branch pipe away from the pipe body, and an elastic membrane for the terminal on the pipe body to be inserted is fixed inside the sleeve, and the positioning ring on the terminal is threadedly connected to the sleeve.

[0030] Preferably, an end cap is provided at the end of the rotating seat away from the connecting seat, and the end cap is fastened to the end of the rotating seat away from the connecting seat to close the first chamber.

[0031] The above technical solution has the following advantages or beneficial effects:

[0032] (1) At least two plasma bags are fixedly connected to the plasma bag connecting tube and connected to the plasma exchange device through the cannula on the connecting tube. The infusion sequence of at least two plasma bags is controlled by a solenoid valve, which extends the replacement cycle of the plasma bags. When the plasma in the plasma bag connected to one connecting tube is exhausted, the medical staff can replace it with a connecting tube that connects at least two plasma bags. During long-term blood exchange, the medical staff do not need to replace the plasma bags one by one, which reduces the frequency of plasma bag replacement and thus reduces the probability of plasma coagulation and treatment failure due to untimely replacement of plasma bags.

[0033] (2) When the fluid bag connecting tube needs to connect more than two fluid bags, multiple connecting tube bodies can be spliced ​​together. When splicing, one tube body with a branch tube fixed to it is inserted into the branch tube on another tube body. The end of the branch tube away from the tube body is connected to the fluid bag, which improves the applicability of the fluid bag connecting tube. Medical staff can adjust the replacement cycle of the fluid bag during blood exchange treatment by splicing the fluid bag connecting tube.

[0034] (3) One end of the cannula is connected to the tube body, and the other end of the cannula is connected to the blood exchange equipment. A positive pressure device is installed at the end of the cannula closest to the tube body. When medical staff pull out the terminal on the tube body from the cannula, the positive pressure device generates a positive pressure environment at the end of the cannula away from the blood exchange equipment, reducing the probability of impurities in the environment entering the cannula, thereby reducing the probability of contamination at the connection between the cannula and the tube body when changing the fluid bag. Attached Figure Description

[0035] Figure 1 A schematic diagram of the structure of the liquid bag connecting tube in a preferred embodiment of the present invention;

[0036] Figure 2 An exploded view of the rotating seat and the connecting seat in a preferred embodiment of the present invention;

[0037] Figure 3 A cross-sectional view of the rotating seat in a preferred embodiment of the present invention;

[0038] Figure 4 A cross-sectional view of the connecting seat in a preferred embodiment of the present invention;

[0039] Figure 5 An exploded view of the terminals and positioning ring on the tube body in a preferred embodiment of the present invention;

[0040] Figure 6 The control principle diagram of the control module is shown in a preferred embodiment of the present invention. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within the scope of the present invention.

[0042] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a fluid bag connecting tube for a blood exchange device is provided. The fluid bag connecting tube is respectively connected to a blood exchange device and at least two fluid bags. The fluid bag connecting tube includes:

[0043] The connecting tube body connects to two fluid bags and the blood exchange device respectively. The connecting tube body includes:

[0044] Tube 1 is fixedly connected to the blood exchange device via a connector;

[0045] Two branch pipes 2, one end of each branch pipe 2 is fixedly connected to one end of the pipe body 1, and the other end of the branch pipe 2 is connected to the liquid bag or the end of the pipe body 1 on another pipe body that is away from the other branch pipe 2.

[0046] Control module 3, used to control the connection and disconnection of branch pipe 2 based on a flow value within branch pipe 2, includes:

[0047] Flow meter 4 is fixed to the end of branch pipe 2 away from pipe body 1, and is connected to both the liquid bag and branch pipe 2, for real-time detection of flow rate.

[0048] Solenoid valve 5 is fixed at the end of branch pipe 2 away from pipe body 1 and located downstream of flow meter 4, and is used to control the connection and disconnection of branch pipe 2.

[0049] Control unit 6 is connected to solenoid valve 5 to control the opening and closing of solenoid valve 5, thereby enabling the connection and disconnection of branch pipe 2.

[0050] The processing unit 7 is connected to the control unit 6. It processes the flow rate value and a preset flow rate threshold to obtain a control signal to control the control unit 6 to drive the solenoid valve 5 to open and close.

[0051] Specifically, in this embodiment, during the blood exchange process, the control unit 6 controls the solenoid valve 5 to open, and the plasma in the liquid bag is input into the blood exchange device through the flow meter 4 and the liquid bag connecting pipe.

[0052] During this process, the processing unit 7 compares the real-time collected flow rate with the preset flow rate threshold. When the flow rate is less than the preset flow rate threshold, the processing unit 7 outputs a control signal, and the control unit 6 controls the solenoid valve 5 to remain open according to the control signal. When the flow rate is not less than the preset flow rate threshold, the processing unit 7 outputs a control signal, and the control unit 6 controls the solenoid valve 5 to switch to the closed state according to the control signal.

[0053] Next, the medical staff replaced the connecting tube and the empty plasma bag as a whole. After the plasma bag was replaced, the processing unit 7 output a control signal, and the control unit 6 drove the solenoid valve 5 to open according to the control signal to continue to supply plasma to the blood exchange equipment.

[0054] Specifically, in this embodiment, the liquid bag is connected to the inlet of the flow meter 4, the outlet of the flow meter 4 is connected to the inlet of the solenoid valve 5, and one end of the branch pipe 2 is fixedly connected to the outlet of the solenoid valve 5, so that the plasma flows from the liquid bag through the flow meter 4 and the solenoid valve 5 in sequence, and flows into the branch pipe 2.

[0055] One of the liquid bag connecting pipes is provided with two branch pipes 2. One end of the branch pipe 2 is integrally formed with one end of the pipe body 1, and the two branch pipes 2 are set on the pipe body 1 at the same end. The two branch pipes 2 and the pipe body 1 are interconnected to form a three-way pipe.

[0056] The end of tube 1 away from branch tube 2 is connected to the blood exchange device via a connector. When medical staff need to splice the fluid bag connecting tube, the end of tube 1 away from branch tube 2 is connected to the branch tube 2 of another fluid bag connecting tube.

[0057] The fluid bag connecting tube offers high flexibility in practical use. Medical staff can splice multiple fluid bag connecting tubes according to the actual consumption of fluid bags, extending the replacement cycle of multiple fluid bags and fluid bag connecting tubes, reducing the frequency of fluid bag replacement for medical staff, and bringing convenience to blood exchange therapy.

[0058] In a preferred embodiment of the present invention, the tube body 1 is connected to an insertion cannula 37 via a connector, and the end of the insertion cannula 37 away from the tube body 1 is connected to a blood exchange device. The connector includes:

[0059] Terminal 8 is fixed to the end of the tube body 1 away from the branch tube 2 and inserted into the insertion tube 37. Terminal 8 has a through hole 9 along its length, and the through hole 9 passes through terminal 8 to connect to the tube body 1.

[0060] The positioning ring 10 is sleeved on the terminal 8 and threaded to the insertion tube 37, and the positioning ring 10 is rotatably connected to the terminal 8.

[0061] Specifically, in this embodiment, when assembling the tube body 1 and the insertion tube 37, the end of the terminal 8 away from the tube body 1 is inserted into the insertion tube 37, and then the positioning ring 10 is rotated so that the positioning ring 10 is threaded onto the outer wall of the insertion tube 37, which enhances the connection strength between the tube body 1 and the insertion tube 37, reduces the probability of the tube body 1 falling off the insertion tube 37 during the blood replacement process, and improves the reliability of the liquid bag connecting tube during use.

[0062] In a preferred embodiment of the present invention, the insertion cannula 37 is provided with a positive pressure device for generating a positive pressure environment at one end of the insertion cannula 37 connected to the tube body 1. The positive pressure device includes:

[0063] The rotating seat 11 has a first chamber 12, and the terminal 8 is inserted into the first chamber 12. A first adjustment hole 13 is provided on the bottom wall of the rotating seat 11 near the insertion tube 37. The first adjustment hole 13 is connected to the first chamber 12 and is offset from the axis of the rotating seat 11.

[0064] The connecting seat 14 has a second chamber 15. One end of the connecting seat 14 is rotatably connected to the rotating seat 11, and the other end is connected to the insertion tube 37. A second adjustment hole 16 is provided on the bottom wall of the connecting seat 14 near the rotating seat 11. The second adjustment hole 16 is coaxially arranged with the first adjustment hole 13 to connect the first chamber 12 and the second chamber 15.

[0065] Inflatable components, including:

[0066] The airbag 17 is circumferentially fixed to the outer wall of the rotating seat 11 and communicates with the first chamber 12.

[0067] The inflation line 18 is connected to the airbag 17. After the airbag 17 is inflated through the inflation line 18, the gas inside the airbag 17 flows into the first chamber 12.

[0068] The inflation device 19 is connected to the control unit 6 and the inflation line 18 respectively. The processing unit 7 outputs a positive pressure signal according to the connection status between the insertion tube 37 and the tube body 1. The control unit 6 drives the inflation device 19 to open and close according to the positive pressure signal.

[0069] Specifically, in this embodiment, the connecting seat 14 is fixed to one end of the intubation tube 37, and the rotating seat 11 is rotatably connected to the end of the connecting seat 14 away from the intubation tube 37. Since the first adjustment hole 13 is offset from the axis of the rotating seat 11 and the second adjustment hole 16 is offset from the axis of the connecting seat 14, medical personnel can rotate the connecting seat 14 to prevent the first adjustment hole 13 from communicating with the second adjustment hole 16, thereby sealing the end of the rotating seat 11 near the connecting seat 14 and preventing gas from entering the second chamber 15 of the connecting seat 14 through the second adjustment hole 16.

[0070] An inflatable component for generating a positive pressure environment is mounted on the outer wall of the rotating base 11. The airbag 17 is circumferentially fixed to the outer wall of the rotating base 11, and the outer wall of the rotating base 11 is also circumferentially provided with three ventilation holes 20, which are connected to the first chamber 12, and cleaned air is blown into the first chamber 12.

[0071] At this time, the first adjustment hole 13 is not connected to the second adjustment hole 16, and the air entering the first chamber 12 is blown out from the end of the rotating seat 11 away from the connecting seat 14, thereby reducing the probability of impurities in the environment entering the first chamber 12 and keeping the first chamber 12 clean.

[0072] Specifically, a waterproof membrane 21 is provided inside the vent 20 to isolate the first chamber 12 from the airbag 17 and prevent plasma from entering the airbag 17 through the vent 20.

[0073] In a preferred embodiment of the present invention, the rotating seat 11 and the connecting seat 14 are rotatably connected by a rotating ring 22. One end of the rotating ring 22 is sleeved on the rotating seat 11, and the other end of the rotating ring 22 is fixed to the connecting seat 14. A limiting ring 23 is provided at the end of the rotating ring 22 away from the insertion tube 37. A limiting groove 24 is provided circumferentially on the rotating seat 11 for the limiting ring 23 to be engaged.

[0074] Specifically, in this embodiment, the rotating ring 22 is integrally formed on the end of the connecting seat 14 away from the insertion tube 37. When medical staff need to adjust the relative position between the first adjustment hole 13 and the second adjustment hole 16, they can rotate the rotating seat 11 to make the rotating seat 11 and the rotating ring 22 rotate relative to each other, which is convenient for operation.

[0075] In a preferred embodiment of the present invention, a plurality of positioning blocks 25 are evenly distributed circumferentially on the outer wall of the rotating seat 11, and at least one positioning groove 26 is provided on the inner wall of the rotating ring 22 for the positioning blocks 25 to engage.

[0076] Specifically, in this embodiment, the rotating ring 22 is made of a ductile material. When the rotating ring 22 rotates circumferentially on the rotating seat 11, the inner wall of the rotating ring 22 is slightly deformed by the pressure of the positioning block 25. When the positioning block 25 rotates into the positioning groove 26, the inner wall of the rotating ring 22 is no longer pressured by the positioning block 25 and returns to its original state. At this time, the inner wall of the rotating ring 22 abuts against the outer wall of the rotating seat 11.

[0077] The number of positioning grooves 26 is set to 6, and they are evenly distributed circumferentially on the inner wall of the rotating ring 22. When the positioning block 25 is engaged in the positioning groove 26, the rotating ring 22 is relatively fixed to the rotating seat 11, thereby reducing the probability of positional displacement between the rotating seat 11 and the connecting seat 14.

[0078] When medical staff rotate the rotating seat 11 so that the first adjustment hole 13 is connected to the second adjustment hole 16, the positioning block 25 is engaged in the positioning groove 26. During the plasma exchange process, this reduces the probability of poor plasma flow caused by positional displacement between the connecting seat 14 and the rotating seat 11, and improves the reliability of the connection structure between the connecting seat 14 and the rotating seat 11.

[0079] Similarly, when medical staff change the IV bag, by rotating the rotating seat 11, the first adjustment hole 13 is not connected to the second adjustment hole 16. At this time, the positioning block 25 is engaged in the positioning groove 26, so that the rotating seat 11 and the connecting seat 14 are not prone to positional displacement, reducing the probability that the gas in the airbag 17 will enter the second chamber 15 or even the intubation tube 37 through the second adjustment hole 16, thus improving the reliability of the positive pressure device.

[0080] In a preferred embodiment of the present invention, a coating 27 made of a hydrophilic material is provided on the inner wall of the first chamber 12.

[0081] Specifically, in this embodiment, the coating 27 has good hydrophilicity. When the plasma flows through the first chamber 12, the coating 27 acts as a lubricant, reducing the probability of plasma remaining in the first chamber 12.

[0082] When replacing the liquid bag, terminal 8 is pulled out from the rotating seat 11, and then the processing unit 7 controls the control unit 6 to drive the inflation device 19 to inflate the airbag 17. In particular, the airbag 17 buffers the airflow speed so that the air enters the first chamber 12 evenly and slowly.

[0083] When medical staff replace the entire fluid bag and connecting tube body, they disinfect the terminal 8 on the tube body 1, and then insert the terminal 8 into the rotating seat 11 to connect the insertion tube 37 to the tube body 1.

[0084] In a preferred embodiment of the present invention, the end of the terminal 8 away from the tube body 1 is tapered, and an elastic membrane 28 is fixed inside the first chamber 12. The elastic membrane 28 has a socket 29 for the terminal 8 to be inserted.

[0085] One end of the through hole 9 is connected to a conical surface of the terminal 8, and the other end of the through hole 9 is connected to the tube body 1.

[0086] The socket 29 is closed to isolate the first chamber 12 from an external environment; when the terminal 8 is inserted through the elastic membrane 28, the socket 29 expands accordingly, and the conical surface is located on the side of the elastic membrane 28 near the connector 14 so that the through hole 9 communicates with the first chamber 12.

[0087] Specifically, in this embodiment, a retaining ring 30 is circumferentially fixed at one end of the terminal 8 near the tube body 1, and an annular groove 31 is formed on the inner wall of the positioning ring 10. The retaining ring 30 is engaged in the annular groove 31, so that the positioning ring 10 is axially positioned on the terminal 8.

[0088] The end of terminal 8 away from tube 1 is tapered, which reduces the resistance of elastic membrane 28 on the end of terminal 8 away from tube 1, and makes it easier for the end of terminal 8 away from tube 1 to pass through the insertion hole 29 of elastic membrane 28.

[0089] As the terminal 8 moves toward the insertion tube 37, the inner diameter of the insertion hole 29 is expanded by the terminal 8, while the elastic membrane 28 is tightened on the outer wall of the terminal 8. The positioning ring 10 is threadedly connected to the rotating seat 11 to fix the terminal 8 on the rotating seat 11.

[0090] The positioning ring 10 has an external thread on its outer wall, and the rotating seat 11 has an internal thread on its inner wall at the end furthest from the connecting seat 14. When the terminal 8 is inserted into the rotating seat 11, the positioning ring 10 is screwed in, so that the positioning ring 10 is inserted into the rotating seat 11 and the two are threadedly fixed. Since the positioning ring 10 is axially positioned on the terminal 8, the probability of the terminal 8 coming loose from the rotating seat 11 after it is inserted into the rotating seat 11 is reduced, and the connection strength between the terminal 8 and the rotating seat 11 is improved.

[0091] When assembling the tube body 1 and the insertion tube 37, when the terminal 8 is inserted into the insertion tube 37, the through hole 9 on the conical surface of the terminal 8 communicates with the first chamber 12 to allow plasma to pass through.

[0092] In a preferred embodiment of the present invention, a sleeve 32 is provided at the end of the branch pipe 2 away from the pipe body 1. An elastic membrane 28 for the terminal 8 on the pipe body 1 to be inserted is fixed inside the sleeve 32. The positioning ring 10 on the terminal 8 is threadedly connected to the sleeve 32.

[0093] Specifically, in this embodiment, medical staff connect three liquid bags to a catheter 37 by splicing two connecting tube bodies. After the plasma in the three liquid bags is consumed, the medical staff replace the liquid bags and connecting tube bodies as a whole, which reduces the frequency of liquid bag replacement by medical staff and improves the applicability of the liquid bag connecting tube in different application environments.

[0094] An elastic membrane 28 is provided at the end of the branch pipe 2 away from the pipe body 1. Because the elastic membrane 28 has tension, when the terminal 8 is not inserted into the branch pipe 2, the inner diameter of the insertion hole 29 is smaller, thereby reducing the probability of external impurities entering the branch pipe 2.

[0095] In addition, the solenoid valve 5 and the branch pipe 2 are fixedly connected by the terminal 8.

[0096] The sleeve 32, fixed to the end of the branch pipe 2 away from the pipe body 1, is used for the insertion and fixing of the terminal 8 on the pipe body 1 and the liquid outlet pipe 38.

[0097] The outlet of the solenoid valve 5 is fixedly connected to an outlet pipe 38. The terminal 8 is fixed to the end of the outlet pipe 38 away from the solenoid valve 5 and inserted into the sleeve 32. The elastic membrane 28 is fixed to the inner wall of the sleeve 32.

[0098] When branch pipe 2 is connected to pipe body 1 of another connecting pipe body, terminal 8 on pipe body 1 is inserted into sleeve 32 and passes through insertion hole 29 of elastic membrane 28, and positioning ring 10 on terminal 8 is threaded to sleeve 32.

[0099] When the branch pipe 2 is connected to the outlet pipe 38, the terminal 8 on the outlet pipe 38 is inserted into the sleeve 32 and passes through the insertion hole 29 of the elastic membrane 28 inside the sleeve 32. The terminal 8 on the outlet pipe 38 is threadedly connected to the sleeve 32 through the positioning ring 10.

[0100] In a preferred embodiment of the present invention, an end cap 33 is provided at the end of the rotating seat 11 away from the connecting seat 14, and the end cap 33 is fastened to the end of the rotating seat 11 away from the connecting seat 14 to close the first chamber 12.

[0101] Specifically, in this embodiment, one end of the end cap 33 has a cover groove 34 for the end of the rotating seat 11 away from the connecting seat 14 to be inserted. In order to enhance the connection strength between the end cap 33 and the rotating seat 11, an annular protrusion 35 is provided on the side wall of the cover groove 34. The annular protrusion 35 is extensible. When one end of the rotating seat 11 is inserted into the cover groove 34 of the end cap 33, the annular protrusion 35 is squeezed and pressed against the side wall of the rotating seat 11.

[0102] During transportation, the end cap 33 is fastened to the end of the rotating seat 11 away from the connecting seat 14, which serves to seal the first chamber 12 and reduce the probability of impurities entering the first chamber 12.

[0103] Before blood exchange treatment, the outlet of the fluid bag is connected to the inlet of the flow meter 4, and the outlet of the flow meter 4 is connected to the inlet of the solenoid valve 5. Then, the terminal 8 on the outlet pipe 38 of the solenoid valve 5 is inserted into the sleeve 32 of the branch pipe 2, and the terminal 8 on the outlet pipe 38 is fixed to the sleeve 32 by the positioning ring 10.

[0104] After the fluid bag is installed on the branch tube 2, the terminal 8 on the tube body 1 is fixed to the end of the rotating seat 11 away from the connecting seat 14, and the insertion tube 37 fixedly connected to the connecting seat 14 is connected to the blood replacement device to complete the installation of the fluid bag.

[0105] During blood exchange therapy, the processing unit 7 controls each solenoid valve 5 to open sequentially according to the priority of the fluid bag usage set by the medical staff, so as to supply blood to the blood exchange equipment.

[0106] The flow meter 4 collects real-time flow values ​​to monitor the flow rate of plasma discharged from the liquid bag. The processing unit 7 compares the flow value with a preset flow threshold and outputs a control signal.

[0107] When the flow rate reaches the preset flow rate threshold, i.e. the maximum capacity of the liquid bag, the processing unit 7 outputs a control signal to control the control unit 6 to drive the corresponding solenoid valve 5 to close, stop the blood supply of the current liquid bag, and open the solenoid valve 5 corresponding to another liquid bag to ensure continuous blood supply to the blood exchange device.

[0108] When the flow rate does not reach the preset flow rate threshold, the processing unit 7 outputs a control signal to control the control unit 6 to drive the corresponding solenoid valve 5 to remain open.

[0109] When the plasma in the fluid bag connected to the connecting tube body is about to be used up, medical staff prepare a fluid bag containing plasma in advance and connect the fluid bag to another connecting tube body in the above manner.

[0110] When replacing the liquid bag, all solenoid valves 5 are in the closed state. Remove the terminal 8 on the tube body 1 from the rotating seat 11.

[0111] A pressure sensor 36 is provided on the inner wall of the rotating seat 11 to detect the pressure value on the side wall of the rotating seat 11 in real time. When the terminal 8 is inserted into the rotating seat 11, the side wall of the terminal 8 abuts against the inner wall of the first chamber 12. At this time, the pressure value is non-zero, the processing unit 7 does not output a positive pressure signal, and the inflation device 19 does not inflate the airbag 17.

[0112] When terminal 8 is removed from rotating seat 11, the pressure value detected by pressure sensor 36 is zero. Processing unit 7 outputs positive pressure signal to control control unit 6 to drive inflation device 19 to start. Cleaned air is slowly and steadily blown into first chamber 12 through vent 20, reducing the probability of external impurities contaminating first chamber 12.

[0113] To prevent air from entering the connector 14 or even the intubation tube 37 through the second adjustment hole 16 during the inhalation process, medical staff need to rotate the rotating ring 22 in advance to adjust the relative position between the first adjustment hole 13 and the second adjustment hole 16, so that the first chamber 12 is not connected to the second chamber 15.

[0114] After removing the terminal 8 of the tube body 1 to be replaced from the rotating seat 11, insert the terminal 8 of the new tube body 1 into the rotating seat 11.

[0115] At this time, the pressure value detected by the pressure sensor 36 is non-zero, the processing unit 7 no longer outputs a positive pressure signal, and the control unit 6 drives the inflation device 19 to stop operating.

[0116] Then, the processing unit 7 controls the corresponding solenoid valve 5 to open according to the preset usage priority of the liquid bag in order to supply blood to the blood replacement device.

[0117] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A fluid bag connecting tube for a blood exchange device, characterized in that, A fluid bag connecting tube is connected to a blood exchange device and at least two fluid bags, wherein the fluid bag connecting tube includes: A connecting tube body, which connects to the two liquid bags and the blood replacement device respectively, comprises: The tube body is fixedly connected to the blood exchange device via a connector; Two branch pipes, one end of each branch pipe is fixedly connected to one end of the pipe body, and the other end of each branch pipe is connected to the liquid bag or the end of the pipe body on another connecting pipe body that is away from the other branch pipe; The control module is used to control the connection and disconnection of the branch pipe according to a flow value in the branch pipe, including: A flow meter, fixed to the end of the branch pipe furthest from the main pipe, is connected to both the liquid bag and the branch pipe, and is used to detect the flow rate in real time. A solenoid valve, fixed to the end of the branch pipe away from the pipe body and located downstream of the flow meter, is used to control the connection and disconnection of the branch pipe. The control unit is connected to the solenoid valve to control its opening and closing, thereby enabling the connection and disconnection of the branch pipe. The processing unit is connected to the control unit and processes the flow rate value and a preset flow rate threshold to obtain a control signal to control the control unit to drive the solenoid valve to open and close. The tube body is connected to an insertion cannula via the connector, and the end of the insertion cannula away from the tube body is connected to the blood replacement device. The connector includes: A terminal is fixed to the end of the tube body away from the branch tube and inserted into the insertion tube. The terminal has a through hole along its length, and the through hole passes through the terminal to communicate with the tube body. A positioning ring is sleeved on the terminal and threaded to the insertion tube, and the positioning ring is rotatably connected to the terminal; The cannula is equipped with a positive pressure device for generating a positive pressure environment at one end of the cannula connected to the tube body. The positive pressure device includes: A rotating seat has a first chamber, and the terminal is inserted into the first chamber. A first adjustment hole is provided on the bottom wall of the rotating seat near the insertion tube. The first adjustment hole is connected to the first chamber and is offset from the axis of the rotating seat. A connecting seat has a second chamber. One end of the connecting seat is rotatably connected to the rotating seat, and the other end is connected to the insertion tube. A second adjustment hole is provided on the bottom wall of the connecting seat near the rotating seat. The second adjustment hole is coaxially arranged with the first adjustment hole to connect the first chamber and the second chamber. Inflatable components, including: The airbag is circumferentially fixed to the outer wall of the rotating seat and communicates with the first chamber. An inflation line is connected to the airbag. After the airbag is inflated through the inflation line, the gas inside the airbag flows into the first chamber. An inflation device is connected to the control unit and the inflation line respectively. The processing unit outputs a positive pressure signal according to the connection status of the insertion tube and the tube body. The control unit drives the inflation device to open and close according to the positive pressure signal.

2. The blood exchange device fluid bag connecting tube according to claim 1, characterized in that, The rotating seat and the connecting seat are rotatably connected by a rotating ring. One end of the rotating ring is sleeved on the rotating seat, and the other end of the rotating ring is fixed to the connecting seat. A limiting ring is provided at the end of the rotating ring away from the insertion tube. A limiting groove is provided circumferentially on the rotating seat for the limiting ring to engage.

3. The blood exchange device fluid bag connecting tube according to claim 2, characterized in that, The outer wall of the rotating seat has a plurality of positioning blocks evenly distributed circumferentially, and the inner wall of the rotating ring has at least one positioning groove for the positioning blocks to engage.

4. The blood exchange device fluid bag connecting tube according to claim 1, characterized in that, The inner wall of the first chamber is provided with a coating made of a hydrophilic material.

5. The blood exchange device fluid bag connecting tube according to claim 1, characterized in that, The end of the terminal furthest from the tube body is tapered. An elastic membrane is fixed inside the first cavity, and the elastic membrane has a socket for inserting the terminal. One end of the through hole is connected to a conical surface of the terminal, and the other end of the through hole is connected to the tube body. The socket is closed to isolate the first chamber from an external environment; when the terminal is inserted through the elastic membrane, the socket expands accordingly, and the conical surface is located on the side of the elastic membrane near the connector so that the through hole communicates with the first chamber.

6. The blood exchange device fluid bag connecting tube according to claim 2, characterized in that, A sleeve is provided at the end of the branch pipe away from the pipe body. An elastic membrane for the terminal on the pipe body to be inserted is fixed inside the sleeve. The positioning ring on the terminal is threaded to the sleeve.

7. The blood exchange device fluid bag connecting tube according to claim 1, characterized in that, An end cap is provided at the end of the rotating seat away from the connecting seat, and the end cap is fastened to the end of the rotating seat away from the connecting seat to close the first chamber.

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