Blood extracorporeal circulation device

Abstract

The utility model discloses a blood extracorporeal circulation device, which belongs to the technical field of blood extracorporeal circulation equipment and comprises an inner tube and an outer tube, the inner tube and the outer tube are integrally nested, one end of the outer tube is connected with an air inlet tube, the air inlet tube is communicated with oxygen inlet equipment, and the other end of the outer tube is connected with an air outlet tube. A temperature changer and a flow speed controller are connected between one end, far away from the air outlet end, of the outer pipe and the oxygen inlet equipment; one end of the inner tube is a liquid inlet end for transporting blood, the other end of a blood inlet of the inner tube is a liquid outlet end, and the liquid outlet end is connected with a temperature sensor, an oxygen saturation sensor, a blood pump and a microembolus filter; the part, in the outer pipe, of the inner pipe is made of a gas exchange membrane material, and the liquid inlet end of the inner pipe is opposite to the gas inlet pipe of the outer pipe. The blood temperature rising process is safer, meanwhile, in the blood temperature rising process, the oxygen saturation index in the blood can be directly adjusted, the blood oxygen value is simple, convenient and controllable on the basis of convenient temperature rising, temperature control and oxygen saturation of in-vitro blood circulation are carried out at the same time, and operation is easy and safe.

Description

Technical Field

[0001] This utility model relates to the field of extracorporeal blood circulation equipment technology, specifically to an extracorporeal blood circulation device. Background Technology

[0002] Extracorporeal blood circulation devices generally include blood tubing and several components for blood circulation, such as a dialyzer and infusion chamber. Hemodialysis utilizes the principle of a semipermeable membrane to complete gas exchange, allowing oxygen to enter the blood and carbon dioxide to leave, thereby purifying the blood and correcting electrolyte and acid-base imbalances.

[0003] However, the final step after dialysis is to return the filtered blood back into the body. The entire extracorporeal blood circulation device operates outside the body, but when the blood is transported back into the body, it is usually drawn out of the body through a venous catheter. The venous catheter leads the blood into the device, where it is purified. The purified blood is then introduced into the body through an arterial catheter. The blood purification device is equipped with a constant temperature device. Because the blood delivery tubing is directly exposed, the temperature of the blood will drop when it flows in the exposed blood delivery tubing, resulting in the temperature of the blood entering the body being too low.

[0004] In clinical anesthesia for cardiac surgery, common extracorporeal circulation devices that warm blood and body fluids include temperature converters or external water baths. Because the heating mechanism is in direct contact with the blood transport tubing, mechanical failure can easily lead to safety hazards. Furthermore, the heating structure is complex and space-consuming, hindering the efficient use of operating room space. Oxygen saturation is insufficient and difficult to control, resulting in unclear blood oxygen levels and imprecise blood temperature control. Cardiac surgery requires hypothermia protection of the heart, and intraoperative anesthesia management necessitates precise control of blood temperature and oxygen saturation. Therefore, a blood extracorporeal circulation device that addresses these issues is needed. Utility Model Content

[0005] The purpose of this invention is to overcome the aforementioned technical difficulties and provide a blood extracorporeal circulation device.

[0006] To achieve the above objectives, the technical solution adopted is as follows: a blood extracorporeal circulation device, comprising an inner tube and an outer tube, wherein the inner tube and the outer tube are nested together, one end of the outer tube is connected to an air inlet pipe, the air inlet pipe is connected to an oxygen supply device, the other end of the outer tube is connected to an air outlet pipe, and the end of the outer tube away from the air outlet end is connected to the oxygen supply device with a temperature converter and a flow rate controller.

[0007] One end of the inner tube is the inlet for transporting blood, and the other end of the blood inlet of the inner tube is the outlet. The outlet is connected to a temperature sensor, an oxygen saturation sensor, a blood pump, and a micro-embolism filter. The part of the inner tube inside the outer tube is made of gas exchange membrane material, and the inlet of the inner tube is arranged opposite to the air inlet of the outer tube.

[0008] Furthermore, the temperature converter, flow rate controller, temperature sensor, and oxygen saturation sensor are all connected to a control system, which includes a control module and an information processing module.

[0009] Furthermore, the information processing module collects data from the temperature sensor and the oxygen saturation sensor and provides feedback. The control module then reacts based on the data from the information processing module, adjusting the temperature converter and the flow rate controller.

[0010] Furthermore, the method of using the extracorporeal blood circulation device is as follows:

[0011] ① Connect the inner tube outlet end to the temperature sensor, oxygen saturation sensor, blood pump, and microembolism filter;

[0012] ② Connect the air inlet pipe of the outer tube to the temperature converter and the flow rate controller, and then connect the air inlet pipe to the oxygen supply equipment. The direction of oxygen supply in the outer tube is opposite to the direction of blood flow in the inner tube.

[0013] ③ Connect the oxygen inlet end of the outer tube to the temperature converter and flow rate controller, connect the inner tube to the human vein, so that the blood enters from the liquid inlet end of the inner tube, and then turn on the oxygen inlet device connected to the air inlet tube of the outer tube.

[0014] Furthermore, the air inlet pipe of the outer tube is connected in sequence to a flow rate controller, a temperature converter, and an oxygen supply device, away from the air outlet end; and the liquid outlet end of the inner tube is connected in sequence to a temperature sensor, an oxygen saturation sensor, a blood pump, and a micro-embolism filter, away from the liquid inlet end.

[0015] Furthermore, the temperature sensor is provided with an anti-clogging mechanism connected to the inner tube near the liquid outlet end. The anti-clogging mechanism includes a filter screen perpendicular to the blood flow direction in the inner tube. A blockage-removing block is provided on the surface of the filter screen near the liquid inlet end of the inner tube. The blockage-removing block has a hollow structure and multiple through holes on its surface. The inner tube is connected to a blockage-removing mechanism on one side of the blockage-removing block. The blockage-removing mechanism includes a blockage-removing box. A blockage-removing hole is provided on the outer wall of the inner tube and communicates with the blockage-removing box. A suction hole is provided on the outer wall of the blockage-removing box. A suction component is detachably provided in the suction hole. The inner diameter of the blockage-removing hole is smaller than the inner diameter of the suction hole.

[0016] Furthermore, the blockage removal block is an equilateral triangle with its bottom surface connected to the filter screen, the through holes on the surface of the blockage removal block are equilateral triangles, and the outer wall of the inner tube is connected to a blockage removal box on each side of the blockage removal block.

[0017] Furthermore, the suction device is a needle tube, and the cross-section of the inner cavity of the unblocking box gradually increases in the direction of blood flow.

[0018] The beneficial effects of the above scheme are as follows: When this extracorporeal blood circulation device is in use, blood flows in from the inlet end of the inner tube, and the oxygen supply device in the air inlet of the outer tube starts to supply oxygen. Oxygen begins to flow into the air inlet, and the blood flow direction is opposite to the oxygen inlet direction. The blood flows to the temperature sensor, and the oxygen saturation sensor displays the blood temperature and oxygen saturation data. Based on the data, the temperature of the temperature regulator in the air inlet of the outer tube is adjusted, thereby adjusting the oxygen temperature, which in turn controls the temperature of the blood in the outer tube. The flow rate controller in the air inlet of the outer tube is adjusted to control the oxygen flow rate into the outer tube. Since the inner tube is gas... The blood exchange membrane regulates the oxygen saturation of the blood in the inner tube. After application, when the blood circulates outside the body and is transported to the human body, the blood's warming process does not directly contact the temperature control device, making the warming process safer. Simultaneously, during the warming process, the oxygen saturation index in the blood can be directly adjusted, allowing for more precise temperature regulation. This achieves the goal of protecting the heart in the anesthesia management of cardiac surgery. In addition to convenient warming, blood oxygen levels are also easily controllable, achieving simultaneous temperature control and oxygen saturation in extracorporeal blood circulation. The operation is simple and safe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the extracorporeal blood circulation device of this utility model.

[0020] Figure 2 This is a schematic diagram of the connection structure between the inner tube and the drain box in Example 3.

[0021] Figure 3 This is a cross-sectional view of Example 3.

[0022] Figure 4 This is a flowchart of the existing extracorporeal blood circulation process in Example 4.

[0023] In the diagram, 1. Inlet; 2. Outlet; 3. Temperature sensor; 4. Oxygen saturation sensor; 5. Blood pump; 6. Microembolism filter; 7. Flow controller; 8. Temperature converter; 9. Air inlet pipe; 10. Inner pipe; 11. Outer pipe; 12. Air outlet pipe; 13. Suction port; 14. Unblocking box; 15. Through hole; 16. Unblocking hole; 17. Filter screen; 18. Unblocking block. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. The described embodiments are merely some, not all, of these embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. Example 1

[0025] like Figure 1 An extracorporeal blood circulation device includes an inner tube 10 and an outer tube 11, which are nested together. One end of the outer tube 11 is connected to an air inlet pipe 9, which is connected to an oxygen supply device. The other end of the outer tube 11 is connected to an air outlet pipe 12. The end of the outer tube 11 away from the air outlet is connected to the oxygen supply device via a temperature converter 8 and a flow rate controller 7.

[0026] One end of the inner tube 10 is the inlet 1 for transporting blood, and the other end of the blood inlet of the inner tube 10 is the outlet 2. The outlet 2 is connected to a temperature sensor 3, an oxygen saturation sensor 4, a blood pump 5, and a microembolism filter 6. The part of the inner tube 10 inside the outer tube 11 is made of gas exchange membrane material. The inlet 1 of the inner tube 10 is arranged opposite to the air inlet 9 of the outer tube 11.

[0027] When this extracorporeal blood circulation device is in use, blood flows in from the inlet 1 of the inner tube 10, and the oxygen supply device of the air inlet 9 of the outer tube 11 starts to supply oxygen. Oxygen begins to flow into the air inlet 9, and the blood flow direction is opposite to the oxygen inflow direction. The blood flows to the temperature sensor 3, and the oxygen saturation sensor 4 displays the blood temperature and oxygen saturation data. Based on the data, the temperature of the temperature regulator 8 of the air inlet 9 of the outer tube 11 is adjusted, thereby adjusting the oxygen temperature and thus controlling the temperature of the blood in the outer tube 11. The flow rate controller 7 of the air inlet 9 of the outer tube 11 is adjusted to control the oxygen flow rate into the outer tube 11. Since the inner tube 10 is a gas exchange membrane, the oxygen saturation of the blood in the inner tube 10 is adjusted. At the same time, when oxygen enters the air inlet 9, the oxygen filling will cause carbon dioxide or waste gas in the inner tube 10 to be discharged to the outlet 12, thereby achieving the effect of adjusting the oxygen saturation and blood circulation in the inner tube 10. After overall application, when blood circulates outside the body and is transported to the human body, the blood temperature rise process does not directly contact the temperature control device, making the blood temperature rise process safer. At the same time, during the blood temperature rise process, the oxygen saturation index in the blood can be directly adjusted. On the basis of convenient temperature rise, the blood oxygen value is also easy to control. It achieves simultaneous temperature control and oxygen saturation in extracorporeal blood circulation. The operation is simple and safe. Example 2

[0028] Based on Embodiment 1, the applicant, considering to simplify the operation of this device, further connects the temperature converter 8, flow rate controller 7, temperature sensor 3 and oxygen saturation sensor 4 to a control system, which includes a control module and an information processing module.

[0029] Furthermore, after the information processing module collects data from the temperature sensor 3 and the oxygen saturation sensor 4, it provides feedback. After seeing the reminder, people can operate the control module to react according to the data from the information processing module and adjust the temperature converter 8 and the flow rate controller 7.

[0030] The information processing and control modules within the aforementioned control system are achievable using existing technologies. For example, after data collection, the control board reacts to the data, and then the operation control board issues commands to the system. Sensor adjustment systems are already mature technologies. The applicant's implementation scheme can be carried out without intelligence; however, if intelligent control is subsequently integrated, using electrical signals and data collection and processing for intelligent control feedback, it will simply be more convenient and reduce manual workload.

[0031] In the above implementation, the air inlet pipe 9 of the outer tube 11, away from the air outlet end, is sequentially connected to the flow rate controller 7, the temperature converter 8, and the oxygen supply device, thus avoiding mutual interference between the flow rate controller 7 and the temperature converter 8. The liquid outlet end 2 of the inner tube 10, away from the liquid inlet end 1, is sequentially connected to the temperature sensor 3, the oxygen saturation sensor 4, the blood pump 5, and the microembolism filter 6. The applicant, after multiple experiments, ultimately found that this sequence yielded the most stable values.

[0032] After the above application, the method of using the extracorporeal blood circulation device is as follows:

[0033] ① Connect the outlet end 2 of the inner tube 10 to the temperature sensor 3, oxygen saturation sensor 4, blood pump 5, and microembolism filter 6;

[0034] ② Connect the air inlet pipe 9 of the outer pipe 11 to the temperature converter 8 and the flow rate controller 7, and then connect the air inlet pipe 9 to the oxygen supply equipment. The direction of oxygen supply in the outer pipe 11 is opposite to the direction of blood flow in the inner pipe 10.

[0035] ③ Connect the oxygen inlet end of the outer tube 11 to the temperature converter 8 and the flow rate controller 7, connect the inner tube 10 to the human vein, so that the blood enters from the liquid inlet end 1 of the inner tube 10, and then turn on the oxygen inlet device connected to the air inlet pipe 9 of the outer tube 11.

[0036] After implementation, based on Example 1, blood flows through the inner tube 10 and oxygen flows through the outer tube 11, with opposite flow directions. When the blood flows to the temperature sensor 3, the sensor transmits the electrical signal of the blood temperature to the information processing module in the control system. After the processing module reacts, according to the system-set indicators, the control module manipulates the temperature converter 8 to control the oxygen temperature, thereby directly controlling the blood temperature. The oxygen saturation measured in the blood is also transmitted as an electrical signal to the information processing module. After the module reacts, the control module controls the flow rate controller 7 to control the rate at which oxygen enters the outer tube 11, thereby achieving intelligent regulation of the oxygen saturation and temperature of the extracorporeal blood circulation. Example 3

[0037] Based on Embodiment 1 and Embodiment 2, the applicant discovered during the experiment that when the blood first enters the inner tube 10 and the device is started, the blood temperature changes, often causing blockage at the liquid outlet 2 of the inner tube 10. This ultimately leads to the temperature sensor 3 and oxygen saturation sensor 4 maintaining constant values ​​for a long time or suddenly showing peak values. Therefore, the applicant has made the following improvements to address this issue.

[0038] like Figure 2-3 The temperature sensor 3 is provided with an anti-blocking mechanism connected to the inner tube 10 on the side near the liquid outlet 2 of the inner tube 10. The anti-blocking mechanism includes a filter screen 17 perpendicular to the blood flow direction of the inner tube 10. The filter screen 17 is provided with a blockage removal block 18 on the surface near the liquid inlet 1 of the inner tube 10. The blockage removal block 18 is a hollow structure and has multiple through holes 15 on its surface. The inner tube 10 is connected to the blockage removal mechanism on one side of the blockage removal block 18. The blockage removal mechanism includes a blockage removal box 14. The outer wall of the inner tube 10 is provided with a blockage removal hole 16 connected to the blockage removal box 14. The outer wall of the blockage removal box 14 is provided with a suction hole 13. The suction hole 13 is detachably equipped with a suction component. The inner diameter of the blockage removal hole 16 is smaller than the inner diameter of the suction hole 13.

[0039] The unblocking block 18 is an equilateral triangle with its bottom surface connected to the filter screen 17. The through holes 15 on the surface of the unblocking block 18 are also equilateral triangles. The outer wall of the inner tube 10 is connected to an unblocking box 14 on each face of the unblocking block 18. The applicant has used both circular and square unblocking blocks 18. After implementation, it was found that the circular unblocking block 18 easily clogs itself when there is sediment in the blood. The square block 18 has the same problem. After multiple implementations, it was found that only when the triangular block is placed on the filter screen 17 will the vertices of the triangular block change the direction of blood flow. Subsequently, the sediment in the blood will be suspended to a certain extent within the filter screen 17 and the three outer sides of the triangular block, so that most of the sediment cannot come into contact with the surface of the unblocking block 18, thus avoiding clogging.

[0040] Furthermore, in specific implementation, the aspiration component is a needle, and the cross-sectional area of ​​the inner cavity of the drain box 14 gradually increases in the direction of blood flow. During the use of the extracorporeal circulation device, if abnormal fluctuations are found in the values ​​of the temperature sensor 3 and the oxygen saturation sensor 4, and adjusting the temperature converter 8 and the flow controller 7 fails to normalize the oxygen saturation blood temperature sensor 3 value, the needle can be inserted into the aspiration hole 13 of the drain box 14 to draw 0.5-3 ml of blood. During the aspiration process, the blood sediment between the drain block 18 and the inner tube 10 wall will flow from the drain hole 16 into the drain box 14 and finally into the needle due to pressure. After the operation, the blood flow in the inner tube 10 is ensured to be unobstructed, avoiding blockage. Based on Embodiments 1 and 2, the stability of the entire device is better. Example 4

[0041] In Embodiments 1, 2, and 3, the applicant incorporated an external blood oxygen saturation temperature control effect into the entire blood circulation device, such as... Figure 4 The figure shows the general operation process of most extracorporeal blood circulation in the prior art. The device in this application is simple to operate, highly controllable, more efficient, and safer.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A blood extracorporeal circulation device, characterized in that: It includes an inner tube (10) and an outer tube (11), which are nested together. One end of the outer tube (11) is connected to an air inlet pipe (9), which is connected to an oxygen supply device. The other end of the outer tube (11) is connected to an air outlet pipe (12). The end of the outer tube (11) away from the air outlet is connected to the oxygen supply device with a temperature converter (8) and a flow rate controller (7). One end of the inner tube (10) is the inlet end (1) for transporting blood, and the other end of the blood inlet of the inner tube (10) is the outlet end (2). The outlet end (2) is connected to a temperature sensor (3), an oxygen saturation sensor (4), a blood pump (5) and a microembolism filter (6). The portion of the inner tube (10) inside the outer tube (11) is made of gas exchange membrane material, and the liquid inlet (1) of the inner tube (10) is set opposite to the air inlet (9) of the outer tube (11).

2. The extracorporeal blood circulation device according to claim 1, characterized in that: The temperature converter (8), flow rate controller (7), temperature sensor (3) and oxygen saturation sensor (4) are all connected to a control system, which includes a control module and an information processing module.

3. The extracorporeal blood circulation device according to claim 2, characterized in that: The information processing module collects data from the temperature sensor (3) and the oxygen saturation sensor (4) and then feeds it back. The control module reacts according to the data from the information processing module and adjusts the temperature converter (8) and the flow rate controller (7).

4. The extracorporeal blood circulation device according to claim 1, characterized in that: The method of using the extracorporeal blood circulation device is as follows: ① Connect the outlet end (2) of the inner tube (10) to the temperature sensor (3), oxygen saturation sensor (4), blood pump (5) and microembolism filter (6); ② Connect the air inlet pipe (9) of the outer tube (11) to the temperature converter (8) and the flow rate controller (7), and then connect the air inlet pipe (9) to the oxygen supply equipment. The direction of oxygen supply in the outer tube (11) is opposite to the direction of blood flow in the inner tube (10). ③ Connect the oxygen inlet end of the outer tube (11) to the temperature converter (8) and the flow rate controller (7), connect the inner tube (10) to the human vein, so that the blood enters from the liquid inlet end (1) of the inner tube (10), and then turn on the oxygen inlet device connected to the air inlet pipe (9) of the outer tube (11).

5. The extracorporeal blood circulation device according to claim 1, characterized in that: The air inlet pipe (9) of the outer tube (11) is connected in sequence to the flow rate controller (7), the temperature converter (8) and the oxygen supply device, away from the air outlet end. The liquid outlet end (2) of the inner tube (10) is connected in sequence to the temperature sensor (3), the oxygen saturation sensor (4), the blood pump (5) and the microembolism filter (6), away from the liquid inlet end (1).

6. The extracorporeal blood circulation device according to claim 1, characterized in that: The temperature sensor (3) is provided with an anti-blocking mechanism connected to the inner tube (10) on the side near the liquid outlet (2) of the inner tube (10). The anti-blocking mechanism includes a filter screen (17) perpendicular to the blood flow direction of the inner tube (10). The filter screen (17) is provided with a blockage block (18) on the side near the liquid inlet (1) of the inner tube (10). The blockage block (18) is a hollow structure. Multiple through holes (15) are opened on the surface of the blockage block (18). The inner tube (10) is connected to a blockage mechanism on one side of the blockage block (18). The blockage mechanism includes a blockage box (14). The outer wall of the inner tube (10) is provided with a blockage hole (16) connected to the blockage box (14). The outer wall of the blockage box (14) is provided with a suction hole (13). The suction hole (13) is detachably provided with a suction component. The inner diameter of the blockage hole (16) is smaller than the inner diameter of the suction hole (13).

7. The extracorporeal blood circulation device according to claim 6, characterized in that: The drain block (18) is an equilateral triangle with its bottom surface connected to the filter screen (17), and the through hole (15) on the surface of the drain block (18) is an equilateral triangle.

8. The extracorporeal blood circulation device according to claim 7, characterized in that: The outer wall of the inner tube (10) is connected to a drain box (14) on each side of the drain block (18).

9. The extracorporeal blood circulation device according to claim 8, characterized in that: The suction device is a needle tube, and the cross-section of the inner cavity of the drainage box (14) is gradually increased in the direction of blood flow.

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