A lung membrane oxygenation device

Abstract

The application discloses a lung membrane oxygenation device, which comprises a lung membrane oxygenator, a telescopic chamber, a centrifugal pump and a controller in sequence through a catheter, the controller is used for controlling the switch of the centrifugal pump to form pulse blood supply, the centrifugal pump comprises a hollow shell, the hollow shell is provided with a blood inlet and a blood outlet, a connecting piece is fixedly arranged on the inner bottom wall of the hollow shell, a rotating piece is arranged in the hollow shell, the bottom of the rotating piece is rotationally connected with the connecting piece, so that the rotating piece can rotate in the hollow shell, a magnet array is arranged in the rotating piece, an electromagnetic driver is sleeved on the hollow shell, and the electromagnetic driver is used for driving the rotating piece to rotate, and the telescopic chamber comprises an outer shell and an inner membrane, the inner membrane is arranged in the outer shell, the inner membrane divides the inner space of the outer shell into a first space and a second space, and the first space is used for blood circulation. By adopting the application, the damage caused by mechanical contact with blood is reduced during blood pumping, and the blood transfusion quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a lung membrane oxygenation device. BACKGROUND

[0002] Extracorporeal membrane oxygenation (ECMO) has been widely used in clinical critical care for many years, mainly used for providing continuous extracorporeal respiration and circulation for patients with severe heart and lung failure, to maintain the life of the patient, ECMO mainly includes intravascular cannula, connecting tube, power pump (artificial heart), oxygenator (artificial lung), oxygen supply tube, monitoring system and other parts, its main working principle is to guide the venous blood in the patient's body to the outside of the body for oxygenation, and then the oxygenated blood is pumped back into the body for oxygen supply, thereby temporarily replacing the heart and lung function. Clinically, centrifugal blood pumps, magnetic suspension blood pumps and the like are used more. The centrifugal blood pump adopts the mode of rotating the rotor around the shaft to drive the blood to rotate, and finally the blood is discharged from the outermost output pipe into the human body under the action of centrifugal force. This way has a large damage to blood cells. In the process of rotating the rotor around the shaft, the friction generated by the rotation of the rotor and the shaft will damage the blood cells, resulting in poor blood quality pumped by this way, and the blood contains a large number of dead blood cells. Long-term use will have adverse effects on the patient's body. SUMMARY

[0003] The present application provides a lung membrane oxygenation device to at least solve the problem of poor blood quality delivered by the centrifugal blood pump in the prior art.

[0004] According to the lung membrane oxygenation device provided by the embodiment of the present application, the lung membrane oxygenator, the telescopic chamber, the centrifugal pump and the controller electrically connected with the centrifugal pump are connected in sequence through the catheter, and the controller is used to control the switch of the centrifugal pump to form pulse blood supply.

[0005] The lung membrane oxygenator, the telescopic chamber, the centrifugal pump and the controller electrically connected with the centrifugal pump are connected in sequence through the catheter, and the controller is used to control the switch of the centrifugal pump to form pulse blood supply.

[0006] The centrifugal pump comprises:

[0007] The hollow shell is provided with a blood inlet and a blood outlet;

[0008] The connecting piece is fixedly arranged on the inner bottom wall of the hollow shell;

[0009] The rotating piece is arranged in the hollow shell, the bottom of the rotating piece is rotationally connected with the connecting piece, so that the rotating piece can rotate in the hollow shell, and the rotating piece is provided with a magnet array;

[0010] The electromagnetic driver is sleeved on the hollow shell, and the electromagnetic driver is used to drive the rotating piece to rotate;

[0011] The telescopic chamber comprises an outer shell and an inner membrane arranged in the outer shell, the inner membrane divides the inner space of the outer shell into a first space and a second space, and the first space is used for blood circulation.

[0012] According to some embodiments of the present application, the connecting piece is a rotating ball, the lower end of the rotating ball is embedded in the inner bottom wall of the hollow shell, and the upper end of the rotating ball is connected with the bottom of the rotating piece.

[0013] According to some embodiments of the present application, the connecting piece is a conical piece, the lower end of the conical piece is embedded in the inner bottom wall of the hollow shell, and the upper end of the conical piece is connected with the bottom of the rotating piece.

[0014] According to some embodiments of the present application, in the direction from the end of the rotating piece close to the connecting piece to the end far from the connecting piece, the cross-sectional diameter of the rotating piece gradually decreases, and the outer peripheral wall of the rotating piece is a smooth curved surface.

[0015] The rotating piece has a through channel suitable for blood circulation in the direction of the central axis of the rotating piece, and the through channel is provided with a hollow matching part close to the end of the connecting piece, and the matching part is suitable for matching connection with the connecting piece.

[0016] According to some embodiments of the present application, the bottom wall and the outer peripheral wall of the rotating piece are each provided with at least two impellers, and the extension direction of the impeller is consistent with the circulation direction of the blood flowing through the impeller.

[0017] According to some embodiments of the present application, a valve is arranged at the outlet of the first space, and the valve is electrically connected with the controller.

[0018] According to some embodiments of the present application, the controller is a programmable signal controller, which can generate a first square wave and a second square wave, the first square wave is used to control the opening and closing of the centrifugal pump, and the second square wave is used to control the opening and closing of the valve.

[0019] According to some embodiments of the present application, the side of the inner membrane close to the first space is coated with an anticoagulant coating.

[0020] According to some embodiments of the present application, the electromagnetic driver is a plurality of electromagnetic coils uniformly distributed along the circumference of the hollow shell.

[0021] According to some embodiments of the present application, the lung membrane oxygenation device further comprises:

[0022] A temperature sensor is arranged in the hollow shell.

[0023] A heating assembly is arranged in the hollow shell and is electrically connected with the temperature sensor.

[0024] By setting the rotating part and the connecting part with small contact area in the centrifugal pump, the mechanical contact between the rotating part and the blood is reduced when the rotating part rotates on the connecting part to pump blood, so that the damage to the blood cells is reduced, and the quality of the output blood is improved.

[0025] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0026] By reading the detailed description of the embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the present application. In the drawings:

[0027] Figure 1 is a structural schematic diagram of a lung membrane oxygenation device in an embodiment of the present application;

[0028] Figure 2 is a structural schematic diagram of a telescopic chamber in an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of a square wave that can be formed by the controller in an embodiment of the present application;

[0030] Figure 4 is a structural schematic diagram of an electromagnetic driver in an embodiment of the present application;

[0031] Figure 5 is a schematic diagram of the distribution of electromagnetic coils in the electromagnetic driver in an embodiment of the present application;

[0032] Figure 6 is a structural schematic diagram of a connecting part in an embodiment of the present application;

[0033] Figure 7 is a structural schematic diagram of a magnet array in an embodiment of the present application;

[0034] Figure 8 is a structural schematic diagram of a rotating part in an embodiment of the present application;

[0035] Figure 9 is a structural schematic diagram of a rotating part in an embodiment of the present application;

[0036] Figure 10 is a structural schematic diagram of a centrifugal pump in an embodiment of the present application;

[0037] Figure 11 is a schematic diagram of a method for driving the rotating part to rotate by the electromagnetic driver in an embodiment of the present application. Detailed Implementation

[0038] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0039] This invention provides a pulmonary membrane oxygenation device, with reference to... Figure 1 ,include:

[0040] A pulmonary membrane oxygenator, a retractable chamber, a centrifugal pump, and a controller electrically connected to the centrifugal pump are sequentially connected via catheters. The controller is used to control the switching of the centrifugal pump to form a pulsed blood supply.

[0041] refer to Figure 10 The centrifugal pump 1 includes:

[0042] A hollow shell 11 is provided with a blood inlet 12 and a blood outlet 13. For example, the blood inlet is located at the upper end of the hollow shell 11, and the blood outlet 13 is located on the side wall of the hollow shell 11.

[0043] The connector 14 is fixedly installed on the inner bottom wall of the hollow shell 11.

[0044] It is understandable that the connector 14 can be directly fixed to the inner bottom wall of the hollow shell 11, or it can be fixed to the inner bottom wall of the hollow shell 11 through an intermediate component.

[0045] A rotating component 15 is disposed within the hollow housing 11. The bottom of the rotating component 15 is rotatably connected to the connecting component 14, allowing the rotating component 15 to rotate within the hollow housing 11. (Reference) Figure 7 The rotating component 15 is provided with a fixing frame 152, and the fixing frame 152 is provided with a magnet array 151.

[0046] Electromagnetic driver 16, reference Figure 4 The electromagnetic actuator 16 is fitted onto the hollow housing 11 and is used to drive the rotating component 15 to rotate. For example, the electromagnetic actuator 16 generates a magnetic field that cooperates with the magnet array 151 inside the rotating component 15, thereby driving the rotating component 15 to rotate inside the hollow housing 11, thereby causing the blood flowing through the rotating component 15 to be pumped out of the centrifugal pump 1 through the blood outlet 13.

[0047] refer to Figure 2The expandable chamber 2 includes an outer shell 21 and an inner membrane 22, with the inner membrane 22 disposed within the outer shell 21. The inner membrane 22 is made of a flexible, expandable membrane and has high elasticity. The inner membrane 22 divides the internal space of the outer shell 21 into a first space and a second space, with the second space covering the first space. The first space has openings at both ends for blood to flow through it. The second space supports the expansion of the first space's volume when the inner membrane 22 deforms, thereby increasing the blood carrying capacity of the first space.

[0048] Using the technical solution of this embodiment, blood sequentially enters the centrifugal pump through the pulmonary membrane oxygenator and the retractable chamber. By setting a rotating part and a connecting part with a small contact area inside the centrifugal pump, the mechanical contact between the rotating part and the blood is reduced when the rotating part rotates on the connecting part to pump blood, thereby reducing damage to blood cells and improving the quality of the output blood.

[0049] Based on the above embodiments, further variant embodiments are proposed. It should be noted that, in order to keep the description brief, only the differences from the above embodiments are described in each variant embodiment.

[0050] According to some embodiments of the present invention, the connector 14 is a rotating ball, the lower end of which is embedded in the inner bottom wall of the hollow shell, and the upper end of which is connected to the bottom of the rotating component 15.

[0051] According to some embodiments of the present invention, reference Figure 6 The connector 14 is a rotating ball. A first mounting base 111 is fixedly provided in the central area of ​​the inner bottom wall of the hollow shell 11. The first mounting base 111 is provided with a first groove adapted to the rotating ball. The rotating ball is engaged in the first groove. (Refer to...) Figure 9 The bottom of the rotating component 15 is provided with a first mating part 153, which is rotatably connected to the connecting component 14 so that the rotating component 15 rotates inside the hollow shell 11.

[0052] According to some embodiments of the present invention, the connecting member is a conical member, the inner bottom wall of the hollow shell is provided with a second mounting seat, the second mounting seat is provided with a second groove adapted to the conical member, the conical member is engaged in the second groove, and the rotating member is provided with a second mating part at one end near the conical member, the second mating part is rotatably connected to the upper end of the conical member, so that the rotating member rotates inside the hollow shell.

[0053] According to some embodiments of the present invention, the cross-sectional diameter of the rotating member 15 gradually decreases from one end near the connecting member 14 to the end away from the connecting member 14, and the plane containing the cross-section is parallel to the plane containing the rotation direction of the rotating member 15. For example, the rotating member 15 is trumpet-shaped, and the outer peripheral wall of the rotating member 15 is a smooth curved surface.

[0054] refer to Figure 10 The rotating member 15 has a through channel 154 suitable for blood flow along its central axis. (Reference) Figure 9 The through channel 154 has a hollowed-out first mating part 153 at one end near the connector 14, and the other end of the through channel 154 is aligned with the blood inlet of the centrifugal pump. The first mating part 153 is adapted to mate with the connector 14. Blood can flow through the through channel 154 and enter the space between the rotating part 15 and the inner bottom wall of the hollow shell 11 through the hollowed-out part of the first mating part 153.

[0055] According to some embodiments of the present invention, reference Figures 8-9 The bottom wall and outer peripheral wall of the rotating component 15 are provided with a plurality of impellers 155, and the extension direction of the impellers 155 is consistent with the flow direction of the blood flowing through the impellers 155. The impellers 155 on the bottom wall can reduce the retention of blood between the bottom wall of the rotating component 15 and the inner bottom wall of the hollow shell 11.

[0056] According to some embodiments of the present invention, reference Figure 2 A valve 23 is provided at the outlet of the first space, and the valve 23 is electrically connected to the controller. By controlling the opening and closing of the valve 23, blood flows from the retractable chamber into the centrifugal pump 1. The valve 23 can prevent blood from flowing back into the retractable chamber 2 due to the lower pressure inside the retractable chamber 2 when the centrifugal pump 1 stops working, thereby preventing blood backflow from the patient.

[0057] According to some embodiments of the present invention, the controller is a programmable pulse signal controller, see reference. Figure 3The system generates a first square wave and a second square wave. The first square wave controls the opening and closing of the centrifugal pump, and the second square wave controls the opening and closing of the valve. By adjusting the frequency and duty cycle of the programmable pulse signal controller, the high and low levels of the first square wave output are switched to control the opening and closing of the centrifugal pump. Rhythmic blood transfusions can be performed for patients of different ages and weights. For example, infants: 6 ml / kg / min; children: 4-5 ml / kg / min; adults: 3 ml / kg / min. This translates to blood flow rates of: infants: 100-120 ml / kg / min; children: 80-100 ml / kg / min; adults: 60-80 ml / kg / min. Based on the patient's age and weight, the pulse signal controller outputs a pulse signal with a specific frequency and duty cycle to control the blood pump to output an appropriate pulsating blood flow.

[0058] The programmable pulse signal controller controls the valve opening and closing by controlling a second square wave. Before the centrifugal pump starts pumping blood, the first square wave outputs a high level to open the valve, and outputs a low level while the centrifugal pump is pumping blood. After the first square wave outputs a low level to control the centrifugal pump to finish pumping blood, the second square wave outputs a high level again to close the valve, preventing blood from flowing back into the expandable chamber due to pressure.

[0059] According to some embodiments of the present invention, the inner membrane 22 is coated with an anticoagulant coating on the side near the first space.

[0060] According to some embodiments of the present invention, reference Figure 5 The electromagnetic driver 16 includes a plurality of electromagnetic coils 161 evenly distributed circumferentially along the hollow housing 11.

[0061] The electromagnetic coil 161 is magnetically aligned with the magnet array 151 in the rotating component 15. One pair of electromagnetic coils is energized every 10 milliseconds, and then the adjacent electromagnetic coils are alternately replaced. The rotating component is rotated 360 degrees along the central axis, which can drive the rotating component, thereby realizing the rotation of the rotating component inside the housing with the connecting component as the bearing.

[0062] For details, please refer to Figure 11Part a describes the force on the magnetic array inside the pump body when the electromagnetic coil is energized to A1 and A2, and part b describes the force on the magnetic array inside the pump body when the electromagnetic coil is energized to B1 and B2. As shown in part a, when A1 and A2 are energized, according to the principle of like poles repelling and unlike poles attracting, the electromagnetic coil A1 will generate two forces F1 and F2 on the magnetic array 1 and magnetic array 2. Since the distance between A1 and magnetic array 1 is smaller than the distance between A1 and magnetic array 2, the magnetic field between A1 and magnetic array 1 is stronger. Therefore, the repulsive force F1 generated by the magnetic field is greater than the force F2, thus generating a clockwise rotational force on the rotating part. Similarly, electromagnetic coil A2 will generate two forces, F3 and F4, on magnet array 3 and magnet array 4 respectively. Since the distance between A2 and magnet array 3 is smaller than that between magnet array 4, the magnetic field between A2 and magnet array 3 is stronger. Therefore, the repulsive force F3 generated by the magnetic field is greater than F4. Electromagnetic coil A2 also generates a clockwise rotational force on the rotating component. As mentioned above, the two magnetic fields generated by energizing A1 and A2 both generate a clockwise rotational force on the rotor, causing the rotating component to rotate clockwise.

[0063] When the rotating component rotates clockwise to the state shown in part b under the action of the magnetic force generated by A1 and A2, A1 and A2 are de-energized, and B1 and B2 are energized simultaneously, as shown in part b. According to the principle of like poles repelling and unlike poles attracting, the magnetic field generated by B1 generates repulsive forces F1 and F2 on magnet array 1 and magnet array 2, respectively. Similarly, since the distance between magnet array 1 and B1 is smaller than the distance between magnet array 2 and electromagnetic coil B1, the magnetic field strength at magnet array 1 is greater. Therefore, the repulsive force F1 of B1 on magnet array 1 is greater than the repulsive force F2 on magnet array 2, generating a clockwise rotational force on the rotor. B2 generates repulsive forces F3 and F4 on magnet arrays 3 and 4 respectively. Since the distance between magnet array 3 and electromagnetic coil B2 is smaller than that between magnet array 4 and electromagnetic coil B2, the magnetic field strength at magnet array 3 is greater. Therefore, the repulsive force F3 generated by the magnetic field is greater than F4. Thus, the magnetic field generated by B2 produces a clockwise rotational force on the rotating component. As mentioned above, both magnetic fields generated by the energization of B1 and B2 produce a clockwise rotational force on the rotating component, causing the rotor to rotate clockwise.

[0064] By alternating the clockwise switching of electromagnet pairs, different magnetic fields are generated to continuously drive the rotor to rotate in a certain direction.

[0065] When it is necessary to stop the rotor from rotating, it is only necessary to stop switching the electromagnetic coils and keep the last set of electromagnetic coils continuously energized. Since the direction of the magnetic field stops changing, the constant magnetic field generated by the last set of electromagnetic coils will eventually control the magnet array inside the rotating part in a stable state, as shown in part c of the figure. Assuming that when the electromagnetic coils are switched to B1 and B2, if you want to stop its rotation, you only need to stop switching the electromagnetic coil pairs and keep only electromagnetic coil pairs B1 and B2 energized. When the rotating part rotates to the state shown in part c of the figure, electromagnetic coil B1 is located in the middle of magnet array 1 and magnet array 2. Since the distance from electromagnetic coil B1 is the same, the magnetic field strength at permanent magnet array 1 and permanent magnet array 2 is the same. The magnetic field forces F1 and F2 generated by electromagnetic coil B1 on magnet array 1 and magnet array 2 are equal, and the rotating part stops rotating in a stable state.

[0066] Similarly, electromagnetic coil B2 is positioned between permanent magnet arrays 3 and 4. Since it is equidistant from electromagnetic coil B2, the magnetic field strength is the same at both permanent magnet arrays 3 and 4. Therefore, the magnetic forces F3 and F4 generated by electromagnetic coil B2 on permanent magnet arrays 3 and 4 are equal, thus the rotating component stops rotating and remains in a stable, stationary state. The above description illustrates the principle of controlling the blood pump to stop.

[0067] When it is necessary to control the centrifugal pump to continue rotating from the above-mentioned stopped state, as shown in part d of the figure, B1 and B2 are de-energized, and the pair of electromagnetic coils that were energized before B1 and B2 are re-energized, as shown in part d, electromagnetic coils A1 and A2. Since A1 and A2 are located between magnet array 2 and magnet array 6, and magnet array 4 and magnet array 5 respectively, in the above-mentioned stopped state, the distance between magnet array 2 and electromagnetic coil A1 is smaller than the distance between magnet array 6 and electromagnetic coil A1. Therefore, the repulsive force F1 of the magnetic field generated by A1 on magnet array 2 is greater than the repulsive force F2 on magnet array 6, controlling the rotating part to rotate clockwise. Similarly, the repulsive force F3 generated by electromagnetic coil A2 on permanent magnet array 4 is greater than the repulsive force F4 generated on magnet array 5, controlling the rotating part to rotate clockwise.

[0068] After the rotor rotates, the electromagnet is energized in a clockwise direction to control the rotor inside the blood pump to rotate continuously in a clockwise direction.

[0069] According to some embodiments of the present invention, reference Figure 4 The pulmonary membrane oxygenation device further includes:

[0070] Temperature sensor 17 is disposed in the hollow housing 11.

[0071] A heating component 18 is disposed in the hollow housing 11 and electrically connected to the temperature sensor 17. The temperature sensor 17 detects the blood flow temperature inside the pump. When the temperature of the flowing blood is detected to be lower than a preset temperature, the heating component 18 is activated to heat the flowing blood, thereby enabling the blood flowing through the centrifugal pump to maintain a constant temperature in the pulmonary membrane oxygenation device.

[0072] The pulmonary membrane oxygenation device is described in detail below with reference to a specific embodiment. It is important to understand that the following description is merely illustrative and not intended to limit the scope of the invention. Any similar structures or variations thereof employing the present invention should be included within the scope of protection of this invention.

[0073] In this embodiment, reference Figure 1 The pulmonary membrane oxygenation device includes a pulmonary membrane oxygenator, a retractable chamber, a centrifugal pump, and a controller that is electrically connected to both the centrifugal pump and the retractable chamber, which are connected in sequence via catheters to control the switching of the centrifugal pump to form a pulsed blood supply and to control the opening and closing of the retractable chamber.

[0074] refer to Figure 10 The centrifugal pump 1 includes a hollow housing 11, with a blood inlet 12 and a blood outlet 13. A spherical bearing made of sapphire glass is fixedly installed on the inner bottom wall of the hollow housing 11. (Reference) Figure 6 The inner bottom wall of the hollow shell 11 is provided with a first mounting seat 111 specifically for placing the ball bearing. The rotating component 15 is trumpet-shaped and disposed inside the hollow shell 11, and can cooperate with the ball bearing to achieve rotation within the hollow shell 11. The rotating component 15 is provided with a through channel 154, and at the bottom of the through channel 154 is a first mating part 153 that mates with the ball bearing, as detailed in the reference. Figure 9 The first mating part 153 is provided with a groove adapted to the spherical bearing, allowing the rotating part 15 to rotate around the spherical bearing. The groove of the first mating part 153 is circumferentially open to facilitate blood flow. (Reference) Figures 8-9 The bottom wall and outer peripheral wall of the rotating component 15 are equipped with multiple impellers 155, which facilitates faster blood pumping and reduces the residence time of blood in the rotating component. (Reference) Figure 7 The rotating component 15 has a fixed frame 152 inside, and a magnet array 151 is evenly arranged on the fixed frame 152 along the circumference of the rotating component 15. (Reference) Figure 4 An electromagnetic actuator 16 is disposed outside the hollow housing 11, for reference. Figure 5 The electromagnetic actuator 16 includes electromagnetic coils 161 that are uniformly distributed circumferentially along the hollow housing 11, and the electromagnetic coils 161 are coplanar with the magnet array 151.

[0075] refer to Figure 4A temperature sensor 17 and a heating component 18 are provided at the upper end of the hollow shell 11. The temperature sensor 17 can monitor the temperature of the blood flowing through the centrifugal pump 1. When the temperature is lower than the preset temperature, the heating component 18 is controlled to heat the blood to keep it at a constant temperature.

[0076] refer to Figure 2 The expandable chamber 2 includes an outer shell 21 and an inner membrane 22, with the inner membrane 22 disposed within the outer shell 21. The inner membrane 22 is made of a flexible, expandable membrane with high elasticity. The inner membrane 22 divides the internal space of the outer shell 21 into a first space and a second space, with the second space covering the first space. The first space has openings at both ends for blood to flow through it. The second space supports the expansion of the first space's volume when the inner membrane 22 deforms, increasing its blood capacity. A valve 23 is located at the outlet of the first space and is electrically connected to the controller. Controlling the opening and closing of the valve 23 controls the flow of blood from the expandable chamber into the centrifugal pump. The valve 23 also prevents backflow of blood into the expandable chamber when the centrifugal pump stops operating, as the lower pressure within the expandable chamber could cause blood to flow back into the patient's blood.

[0077] refer to Figure 3 The controller generates a first square wave and a second square wave. The first square wave controls the opening and closing of the centrifugal pump, while the second square wave controls the opening and closing of valve 23. By adjusting the controller's frequency and duty cycle, the high and low levels of the first square wave output are switched to control the opening and closing of the centrifugal pump. Before the centrifugal pump starts pumping blood, the second square wave outputs a high level to open the valve and then outputs a low level while the centrifugal pump is pumping blood. After the centrifugal pump finishes pumping blood, the second square wave outputs a high level again to close the valve, preventing blood from flowing back into the expandable chamber due to pressure.

[0078] When using the pulmonary membrane oxygenation device in this embodiment, one end of the pulmonary membrane oxygenator is connected to a catheter for venous blood retrieved from the body to oxygenate the input blood, and the other end is connected to one end of a retractable chamber via a catheter. The other end of the retractable chamber is connected to the blood inlet of a centrifugal pump via a catheter, and the blood outlet of the centrifugal pump is connected to the catheter for pumping blood into the body. Blood flows through the body, through the pulmonary membrane oxygenator and the retractable chamber, into the centrifugal pump. The controller controls the opening and closing of the centrifugal pump through specific pulse signals to provide pulsed blood supply. The rotating component inside the centrifugal pump rotates within the pump via a ball bearing, reducing mechanical contact with the blood and further reducing friction on the device components, thus improving the quality of blood transfusion. A through channel is provided at the central axial position of the rotating component, and impellers are provided at the bottom and outer peripheral wall, ensuring that the blood at the bottom of the rotating component is always in a flowing state, preventing the blood at the bottom from clotting into thrombi and causing serious complications such as vascular blockage. The retractable chamber can deform while the blood pump is rapidly pumping blood, allowing it to recover excess blood from the patient's body and preventing complications caused by sudden changes in blood pressure.

[0079] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations, and the various embodiments can be freely combined in different ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0080] It should be noted that well-known methods, structures, and techniques are not shown in detail in this specification so as not to obscure the understanding of this specification.

Claims

1. A pulmonary membrane oxygenation device, comprising: The application relates to a lung membrane oxygenator device. The lung membrane oxygenator device comprises a lung membrane oxygenator, a telescopic chamber, a centrifugal pump and a controller. The centrifugal pump comprises a hollow shell, a connecting piece and a rotating piece. The connecting piece is fixedly arranged on the inner bottom wall of the hollow shell. The rotating piece is arranged in the hollow shell and rotationally connected to the connecting piece. The rotating piece is provided with a magnet array. The electromagnetic driver is arranged on the hollow shell and generates a magnetic field to drive the rotating piece to rotate. The telescopic chamber comprises an outer shell and an inner membrane.

2. The pulmonary membrane oxygenation device of claim 1, wherein, The inner membrane divides the inner space of the outer shell into a first space and a second space.

3. The pulmonary membrane oxygenation device of claim 1, wherein, The first space is provided with openings at both ends for blood flow.

4. The pulmonary membrane oxygenation device of claim 2 or 3, wherein, The second space is arranged outside the first space and is used to support the deformation of the inner membrane. The connecting piece is a rotating ball.

5. The pulmonary membrane oxygenation device of claim 1, wherein, The connecting piece is a conical piece.

6. The pulmonary membrane oxygenation device of claim 1, wherein, The cross-sectional diameter of the rotating piece gradually decreases from the end close to the connecting piece to the end far from the connecting piece.

7. The pulmonary membrane oxygenation device of claim 6, wherein, The rotating piece is provided with a through channel suitable for blood flow.

8. The pulmonary membrane oxygenation device of claim 1, wherein, The through channel is provided with a hollow matching part close to the connecting piece.

9. The pulmonary membrane oxygenation device of claim 1, wherein, The bottom wall and the outer peripheral wall of the rotating piece are provided with at least two impellers.

10. The pulmonary membrane oxygenation device of claim 1, wherein, The outlet of the first space is provided with a valve. The controller is a programmable signal controller. The inner membrane close to the first space is coated with an anticoagulant coating. The electromagnetic driver is a plurality of electromagnetic coils uniformly distributed along the circumference of the hollow shell. The lung membrane oxygenator device further comprises a temperature sensor and a heating assembly.

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