Blood pump

Abstract

The invention discloses a blood pump and relates to the technical field of medical instruments, the blood pump comprises an axial flow impeller, a pump shell and a connector, the pump shell is provided with a containing cavity, a liquid inlet and a liquid outlet, the containing cavity communicates with the liquid inlet and the liquid outlet, and the whole axial flow impeller is arranged in the area, located between the liquid outlet and the liquid inlet, of the containing cavity; the connector is located on the axial side of the axial flow impeller, a flow guide part is arranged at the end, close to the axial flow impeller, of the connector and extends into the pump shell, the circumferential surface of the flow guide part is a flow guide face, and the flow guide face obliquely extends in the direction away from the axial flow impeller and the direction close to the liquid outlet and is used for guiding blood to the liquid outlet. A first electromagnetic assembly is arranged in the flow guide part and used for generating magnetic moment between the first electromagnetic assembly and the first permanent magnet assembly under the condition that a power source is switched on, so that the axial flow impeller rotates under the action of the magnetic moment. The risk that thrombus is formed between the connector and the impeller is reduced.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly relates to a blood pump. Background Art

[0002] A blood pump is a commonly used medical device that can provide power for the flow of blood. For example, the heart is the power organ of the human body. The main function of the heart is to provide power for the flow of blood and transport the blood to various parts of the body. When a patient's heart has problems and cannot provide power, the patient's life is in danger. The blood pump can be implanted into the patient's heart to provide power for the patient's blood.

[0003] In related technologies, the impeller of the blood pump is driven by a motor. The output shaft of the motor rotates and outputs power to drive the impeller fixed to the output shaft to rotate. However, a blood clot is likely to form at the connection between the output shaft of the motor and the impeller, increasing the surgical risk. Summary of the Invention

[0004] In view of this, the embodiments of this application are expected to provide a blood pump to improve the safety during the use of the blood pump.

[0005] To achieve the above object, the embodiments of this application provide a blood pump, including:

[0006] An axial-flow impeller;

[0007] A pump housing having a receiving cavity, a liquid inlet, and a liquid outlet. The receiving cavity communicates with the liquid inlet and the liquid outlet. The entire axial-flow impeller is disposed in the area of the receiving cavity between the liquid outlet and the liquid inlet;

[0008] A connector located on one axial side of the axial-flow impeller and connected to the axial end of the pump housing near the liquid outlet. One end of the connector close to the axial-flow impeller has a guiding portion that extends into the pump housing. The circumferential surface of the guiding portion is a guiding surface that extends obliquely towards the liquid outlet in a direction away from the axial-flow impeller for guiding blood to the liquid outlet;

[0009] The axial-flow impeller has a first permanent magnet assembly, and the inside of the guiding portion has a first electromagnetic assembly. The first electromagnetic assembly is used to generate a magnetic torque with the first permanent magnet assembly when the power is turned on, so that the axial-flow impeller rotates under the action of the magnetic torque.

[0010] In some embodiments, the axial-flow impeller includes a hub and blades. The blades are disposed on the hub. The blood pump includes a ferromagnetic unit. A second permanent magnet assembly is disposed at one end of the hub away from the connector. The ferromagnetic unit is disposed on the inner wall of the pump housing. During the rotation of the axial-flow impeller, the ferromagnetic unit can form at least a radial acting force with the second permanent magnet assembly, so that the axial-flow impeller is suspended in the accommodation cavity.

[0011] In some embodiments, the ferromagnetic unit includes a permanent magnet ring structure that surrounds one end of the hub away from the connector.

[0012] In some embodiments, the ferromagnetic unit includes an electromagnetic ring structure that surrounds one end of the hub away from the connector. The electromagnetic ring structure is configured to form a radial acting force with the second permanent magnet assembly when the power is turned on.

[0013] In some embodiments, one side of the axial-flow impeller facing the connector has a first end face, and one side of the guiding portion facing the axial-flow impeller has a second end face. The first end face and the second end face face each other. When the first electromagnetic assembly is powered on, a magnetic floating gap can be formed between the first end face and the second end face under the interaction of the first permanent magnet assembly and the first electromagnetic assembly.

[0014] In some embodiments, when the first electromagnetic assembly is powered off, the first end face and the second end face are in contact with each other under the interaction of the first permanent magnet assembly and the first electromagnetic assembly.

[0015] In some embodiments, the first end face and the second end face are parallel to each other.

[0016] In some embodiments, the outer diameter of the first end face is 0.9 to 1.1 times the outer diameter of the second end face.

[0017] In some embodiments, the axial-flow impeller includes a hub and blades. The blades are disposed on the hub. Along the axial direction approaching the connector, the outer diameter of the hub continuously increases.

[0018] In some embodiments, the circumferential surface of the hub is a convex arc surface.

[0019] In some embodiments, one side of the axial-flow impeller facing the connector has a first end face. The blade extends to one end of the hub close to the connector, and the distance between the extended end of the blade and the first end face does not exceed the radius of the first end face.

[0020] In some embodiments, the axial flow impeller includes a hub and blades. The blades are disposed on the hub. The hub includes a housing and a cover. The first permanent magnet assembly is disposed inside the housing. The axial end of the housing facing the connector has an opening. The cover is disposed at one end of the housing close to the connector and closes the opening.

[0021] In the blood pump provided by the embodiment of the present application, the connector is located on one axial side of the axial flow impeller. When the first electromagnetic assembly of the connector is powered on, a magnetic moment is generated between the first electromagnetic assembly and the first permanent magnet assembly, so that the axial flow impeller rotates under the action of the magnetic moment, driving blood to flow from the liquid inlet of the pump housing to the liquid outlet. By the driving method of the magnetic moment, the contact between the connector and the axial flow impeller during the working process is reduced. The connector does not need to be connected to the axial flow impeller by setting an output shaft, the structure is simple, and the risk of thrombus formation between the connector and the axial flow impeller is reduced, improving the surgical safety; secondly, the connector is disposed on one axial side of the axial flow impeller, the structure is simple and compact, the radial size of the blood pump is reduced, facilitating the placement of the blood pump into the body, such as a target position with a small space like the ventricle, without occupying a large radial space, reducing the surgical risk; in addition, the circumferential surface of the guiding portion is a guiding surface, and no additional guiding structure needs to be provided, which can change the blood flow direction and guide the blood to the liquid outlet, reducing the damage to the blood; in addition, the setting of the axial flow impeller enables the blood to flow smoothly in the pump housing, providing a higher flow rate while reducing the pressure loss. In addition, the overall setting of the axial flow impeller is between the liquid inlet and the liquid outlet, and the overall structure of the axial flow impeller can be relatively compact, reducing the requirement for the axial size of the blood pump. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a blood pump provided by an embodiment of the present application;

[0023] Figure 2 is Figure 1 a schematic structural diagram of the blood pump from another perspective as shown;

[0024] Figure 3 is Figure 1 a schematic cross-sectional view of the blood pump as shown, wherein the dotted arrow in the figure indicates the blood flow direction;

[0025] Figure 4 is a schematic cross-sectional view of an impeller provided by an embodiment of the present application.

[0026] Description of the Reference Numerals

[0027] Axial flow impeller 1; first end face 1a; first permanent magnet assembly 11; hub 12; housing 121; opening 121a; cover 122; blade 13; second permanent magnet assembly 14; pump housing 2; accommodation cavity 2a; liquid inlet 2b; liquid outlet 2c; support 21; connector 3; second end face 3a; first electromagnetic assembly 31; diversion part 32; diversion surface 32a; ferromagnetic unit 4. Specific embodiments

[0028] The following further describes the embodiments of the present application in detail with reference to the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0029] In the following description, the terms "first / second / ..." involved are only used to distinguish different objects, and do not indicate that there are the same or related relationships between the objects. It should be understood that the orientation description "axial direction" involved represents the axial direction shown in the specific corresponding schematic diagram, which may or may not be the axial direction in the normal use state.

[0030] It should be noted that the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element. "Plurality" means greater than or equal to two.

[0031] The blood pump is a commonly used medical device, and the blood pump can provide power for the flow of blood. For example, the heart is the power organ of the human body. The main function of the heart is to provide power for the flow of blood and transport the blood to various parts of the body. When the patient's heart has problems and cannot provide power, the patient's life is very dangerous. For high-risk and complex coronary heart disease patients, the myocardial ischemia caused by the transient blood flow interruption during percutaneous coronary intervention or the increased heart load caused by injecting contrast agent may both trigger circulatory collapse and even sudden death. At this time, the blood pump can provide power for the patient's blood and pump the blood from the ventricle to the arterial blood vessel.

[0032] An embodiment of the present application provides a blood pump. Please refer to Figures 1 to 4 , the blood pump includes an axial flow impeller 1, a pump housing 2 and a connector 3.

[0033] The pump housing 2 has an accommodation cavity 2a, a liquid inlet 2b and a liquid outlet 2c, and the accommodation cavity 2a communicates with the liquid inlet 2b and the liquid outlet 2c. That is, the blood enters the blood pump from the liquid inlet 2b and flows out of the blood pump through the accommodation cavity 2a from the liquid outlet 2c.

[0034] The axial flow impeller 1 is used to drive blood to flow from the liquid inlet 2b to the liquid outlet 2c.

[0035] It can be understood that the liquid inlet 2b is used for blood to enter the blood pump, and the liquid outlet 2c is used for blood to leave the blood pump. Exemplarily, the liquid inlet 2b can be communicated with the ventricle, and the liquid outlet 2c can be communicated with the arterial blood vessel. Thus, under the driving action of the axial flow impeller 1, the blood from the ventricle can flow through the liquid inlet 2b and the liquid outlet 2c to the arterial blood vessel to realize the pumping of blood.

[0036] It should be noted that the axial flow impeller 1 mentioned refers to that the whole of the axial flow impeller 1 is arranged in the area of the accommodation cavity 2a between the liquid outlet 2c and the liquid inlet 2b, that is, any part of the axial flow impeller 1 is located between the liquid inlet 2b and the liquid outlet 2c.

[0037] Please refer to Figure 3 , the axial flow impeller 1 includes blades 13, the blades 13 extend in the accommodation cavity 2a and do not extend into the range where the liquid outlet 2c is located. When driving the blood to flow, the axial flow impeller 1 can push the blood to flow centrally to the liquid outlet 2c. Exemplarily, the blades 13 are in an airfoil shape or extend obliquely along the axial direction of the accommodation cavity 2a. When the axial flow impeller 1 rotates, the blood passes through the blades 13 along the axial direction of the axial flow impeller 1. The blood changes the flow direction under the action of the blades 13. The blades 13 make the blood have a larger tangential velocity and a smaller pressure, and flow from the liquid inlet 2b to the liquid outlet 2c. The setting of the axial flow impeller 1 enables the blood to flow smoothly in the pump housing 2, provides a higher flow rate, and reduces the pressure loss at the same time.

[0038] It can be understood that the liquid inlet 2b and the liquid outlet 2c of the pump housing 2 are located on both sides of the axial flow impeller 1 along the axial direction, and the projection of the axial flow impeller 1 on the pump housing 2 along the radial direction is located on the cavity wall of the accommodation cavity 2a.

[0039] The connector 3 is located on one axial side of the axial flow impeller 1, and the connector 3 is connected to the axial end of the pump housing 2 close to the liquid outlet 2c.

[0040] One end of the connector 3 close to the axial flow impeller 1 has a guiding portion 32, the guiding portion 32 extends into the pump housing 2, the circumferential surface of the guiding portion 32 is a guiding surface 32a, and along the direction away from the axial flow impeller 1, the guiding surface 32a is inclined towards the direction close to the liquid outlet 2c for guiding the blood to the liquid outlet 2c.

[0041] Exemplarily, the guiding surface 32a is an arc surface, which can better change the blood flow direction and reduce the damage to the blood.

[0042] The axial-flow impeller 1 has a first permanent magnet assembly 11, and the connector 3 has a first electromagnetic assembly 31. The first electromagnetic assembly 31 is used to generate a magnetic torque between it and the first permanent magnet assembly 11 when the power is turned on, so that the axial-flow impeller 1 rotates under the action of the magnetic torque.

[0043] Specifically, when the first electromagnetic assembly 31 is powered on, the blood pump can drive the axial-flow impeller 1 to rotate in the pump housing 2 through the connector 3, forming a negative pressure near the liquid inlet 2b of the blood pump, so that the blood in the ventricle smoothly enters the accommodation cavity 2a of the pump housing 2 from the liquid inlet 2b. Through the work of the axial-flow impeller 1, the mechanical energy is converted into the kinetic energy and pressure potential energy of the blood, and is discharged from the liquid outlet 2c and enters the arterial blood vessel to achieve the purpose of ventricular assistance.

[0044] In the related art, the impeller of the blood pump is driven by a motor. The output shaft of the motor will rotate and output power to drive the impeller fixed on the output shaft to rotate. However, thrombus is likely to form at the connection between the output shaft of the motor and the impeller, increasing the surgical risk. In addition, the motor adopts a structure in which the stator and the rotor are arranged radially, making the radial dimension of the motor relatively large, which is not conducive to the miniaturization of the blood pump.

[0045] The blood pump provided by the embodiment of the present application has the connector 3 located on the axial side of the axial-flow impeller 1. The first electromagnetic assembly 31 of the connector 3 generates a magnetic torque between it and the first permanent magnet assembly 11 when the power is turned on, so that the axial-flow impeller 1 rotates under the action of the magnetic torque, driving the blood to flow from the liquid inlet 2b of the pump housing 2 to the liquid outlet 2c. Through the driving mode of the magnetic torque, the connector 3 does not need to be connected to the axial-flow impeller 1 by setting an output shaft, with a simple structure, and reduces the risk of thrombus formation between the connector 3 and the axial-flow impeller 1, improving the surgical safety; secondly, the connector 3 is arranged on the axial side of the axial-flow impeller 1, with a simple and compact structure, reducing the radial dimension of the blood pump, facilitating the placement of the blood pump into a target position with a small space in the body such as the ventricle, not occupying a large radial space, and reducing the surgical risk; in addition, the circumferential surface of the guiding part 32 is a guiding surface 32a, and no additional guiding structure needs to be set, which can change the blood flow direction and guide the blood to the liquid outlet 2c, reducing the damage to the blood; in addition, the whole of the axial-flow impeller 1 is arranged between the liquid inlet 2b and the liquid outlet 2c, and the overall structure of the axial-flow impeller 1 can be relatively compact, reducing the requirement for the axial dimension of the blood pump.

[0046] The blood pump provided by the embodiment of the present application generates an axial thrust on the blood during the rotation of the axial-flow impeller 1, enabling the blood to flow axially, and can obtain a relatively high blood flow at a relatively low rotational speed, improving the blood pumping capacity of the blood pump.

[0047] In some embodiments, please refer to Figure 3 and Figure 4, the axial flow impeller 1 includes a hub 12 and blades 13. The blades 13 are arranged on the hub 12.

[0048] The shape of the blades 13 is not limited. For example, the blades 13 can be entire blades extending axially; or, for another example, the blades 13 can be formed by combining a plurality of independent sub - blades.

[0049] The cross - sectional shape of the blades 13 is not limited. For example, the cross - sectional shape of the blades 13 can be an airfoil shape. In this case, the thicknesses of various parts of the cross - section of the blades 13 are different. Of course, the thicknesses of various parts of the cross - section of the blades 13 can also be the same.

[0050] The number of the blades 13 is not limited. For example, the number of the blades 13 can be one or multiple.

[0051] In some embodiments, please refer to Figure 3 , one side of the axial flow impeller 1 facing the connector 3 has a first end face 1a, and one side of the guiding part 32 facing the axial flow impeller 1 has a second end face 3a. The first end face 1a and the second end face 3a face each other. When the first electromagnetic component 31 is powered on, a magnetic floating gap can be formed between the first end face 1a and the second end face 3a under the interaction of the first permanent magnet component 11 and the first electromagnetic component 31.

[0052] It can be understood that the magnetic floating gap means that when the first electromagnetic component 31 is powered on, the first end face 1a and the second end face 3a are arranged at intervals, that is, the first end face 1a and the second end face 3a do not contact each other.

[0053] In this embodiment, a magnetic floating gap can be formed between the first end face 1a and the second end face 3a under the interaction of the first permanent magnet component 11 and the first electromagnetic component 31. The first end face 1a and the second end face 3a do not contact each other, avoiding the contact between the connector 3 and the axial flow impeller 1 during operation. There is no mechanical wear between the connector 3 and the axial flow impeller 1, extending the service lives of the connector 3 and the axial flow impeller 1. The structure is simple, with high reliability, facilitating the continuous operation of the blood pump and reducing the frequency of re - operations; in addition, there is almost no noise generated by mechanical friction during the operation of the blood pump, providing a quieter and more comfortable surgical treatment environment.

[0054] The formation method of the magnetic floating gap is not limited, and the method for maintaining the stable rotation of the axial flow impeller 1 under the magnetic floating gap is not limited.

[0055] Exemplarily, when the first electromagnetic component 31 is just powered on and has not yet driven the axial flow impeller 1 to rotate, there is an interaction between the first electromagnetic component 31 and the first permanent magnet component 11, generating a magnetic torque. The magnetic torque causes the axial flow impeller 1 to receive a rotational driving force and a repulsive force that repels the connector 3 in the axial direction. Under the action of the repulsive force, the axial flow impeller 1 moves in a direction away from the connector 3. Thus, a gap is generated between the first end face 1a and the second end face 3a, thereby forming a magnetic levitation gap. When the axial flow impeller 1 rotates, the axial flow impeller 1 drives the blood to flow from the liquid inlet 2b towards the liquid outlet 2c. The axial flow impeller 1 is axially subjected to a force exerted by the blood towards the liquid inlet 2b side. By changing the control program to change relevant parameters such as the current of the power supply, etc., the repulsive force that repels the connector 3 in the axial direction of the axial flow impeller 1 is converted into an attractive force that attracts the connector 3, that is, an attractive force that moves towards the second end face 3a. This attractive force is opposite to the direction of the force exerted by the blood and can balance each other. Thus, the axial flow impeller 1 is axially force-balanced, and the axial flow impeller 1 can stably rotate under the magnetic levitation gap.

[0056] It can be understood that

[0057] In some embodiments, when the first electromagnetic component 31 is powered off, the first end face 1a and the second end face 3a are in contact with each other under the interaction of the first permanent magnet component 11 and the first electromagnetic component 31.

[0058] Exemplarily, the first permanent magnet component 11 has a constant magnetic field. The first electromagnetic component 31 has an iron core and a coil wound around the iron core, which generates a magnetic field when passing current. When there is no current passing through the non-powered first electromagnetic component 31, there is no self-generated magnetic field. When the first electromagnetic component 31 approaches the first permanent magnet component 11, the magnetic field generated by the first permanent magnet component 11 will generate an induced magnetic field on the iron core of the first electromagnetic component 31, making the iron core of the first electromagnetic component 31 also have magnetism and attracting each other with the first permanent magnet component 11.

[0059] In this way, the axial flow impeller 1 and the connector 3 can be in contact with each other when the first electromagnetic component 31 is powered off. When the blood pump is implanted into the body, the axial flow impeller 1 can be fixed to the connector 3, reducing the surgical risk brought by the detachment of the axial flow impeller 1.

[0060] It can be understood that in this embodiment, the first electromagnetic component 31 is disconnected from the power supply, that is, the first electromagnetic component 31 and the first permanent magnet component 11 cannot generate a magnetic torque. That is, in this case, the axial flow impeller 1 is only subjected to an attractive force that moves axially towards the first electromagnetic component 31 under the interaction of the first permanent magnet component 11 and the first electromagnetic component 31, that is, an attractive force that moves towards the second end face 3a. Under the action of this attractive force, the first end face 1a and the second end face 3a are in contact with each other.

[0061] The following briefly describes the switching process of the forces acting on the axial flow impeller 1 of the blood pump in this embodiment from power-off to power-on operation.

[0062] When the first electromagnetic component 31 is not powered on, no magnetic torque is generated between the first electromagnetic component 31 and the first permanent magnetic component 11. An attractive force is generated between the first permanent magnetic component 11 and the first electromagnetic component 31 along the axial direction, driving the axial flow impeller 1 to move towards the connector 3 until it contacts the connector 3, that is, the first end face 1a and the second end face 3a are in contact with each other, facilitating the installation of the axial flow impeller 1 and the placement of the blood pump into the human body. When the blood pump is placed in the human body and the first electromagnetic component 31 is powered on, at this time, the axial flow impeller 1 has not started to rotate. Under the action of the magnetic torque generated between the first electromagnetic component 31 and the first permanent magnetic component 11, the axial flow impeller 1 is subjected to a rotational driving force and a repulsive force that moves away from the connector 3 along the axial direction. Thus, the first end face 1a moves away from the second end face 3a along the axial direction, creating a magnetic floating gap between them. The axial flow impeller 1 rotates under the action of the rotational driving force, driving the blood to flow from the liquid inlet 2b towards the liquid outlet 2c. The blood exerts a force on the axial flow impeller 1 along the axial direction towards the liquid inlet 2b side. By changing parameters such as the current of the power supply, the repulsive force that causes the axial flow impeller 1 to move away from the connector 3 along the axial direction is transformed into an attractive force that moves towards the connector 3 along the axial direction. This attractive force is opposite to the force exerted by the blood and is balanced with each other. In this way, the axial flow impeller 1 is in axial force balance and can rotate stably under the magnetic floating gap.

[0063] In some embodiments, please refer to Figure 3 , the first end face 1a and the second end face 3a are parallel to each other along the axial direction, which can make the magnetic floating gap between them be set at an equal distance, facilitating the uniform distribution of the magnetic field and facilitating the control of the force balance of the axial flow impeller 1.

[0064] In some embodiments, the outer diameter of the first end face 1a is 0.9 to 1.1 times the outer diameter of the second end face 3a.

[0065] Exemplarily, the outer diameter of the first end face 1a can be 0.9 times, 0.92 times, 0.95 times, 0.97 times, 1 time, 1.05 times or 1.1 times the outer diameter of the second end face 3a, etc. That is to say, the sizes of the two are the same or close, so as to make full use of the radial size of the first end face 1a and the radial size of the second end face 3a, arrange the first permanent magnetic component 11 uniformly in the area near the first end face 1a, arrange the first electromagnetic component 31 relatively uniformly near the second end face 3a, and make the structure as compact as possible within the limited space.

[0066] In some embodiments, please refer to Figure 3 andFigure 4 In the direction of approaching the connector 3 along the axis, the outer diameter of the hub 12 continuously increases.

[0067] That is to say, in the direction of approaching the connector 3 along the axis, the cross-sectional area of the hub 12 in the plane perpendicular to the axis of the axial flow impeller 1 gradually increases. In this way, the hub 12 can guide the blood flowing along the axis out of the liquid outlet 2c along the outer wall of the hub 12. The hub 12 can gently change the flow direction of the blood and reduce the blood flow resistance.

[0068] Exemplarily, the circumferential surface of the hub 12 is a convex arc surface. The convex arc surface is formed by the circumferential surface of the hub 12 protruding towards the outside of the hub 12. In this way, through the design of the convex arc surface, when the blood flows along the convex arc surface, on the one hand, it can better change the blood flow direction and reduce the damage to the blood; on the other hand, it can also reduce the flow resistance and increase the smoothness of the blood flow.

[0069] In some embodiments, the cross-sectional shape of the hub 12 at any part in the plane perpendicular to the axis of the axial flow impeller 1 is circular.

[0070] It can be understood that the cross-sectional area shape of the hub 12 at any part in the plane perpendicular to the axis of the axial flow impeller 1 is circular, and the resistance of the blood flowing on the outer wall of the hub 12 is relatively small. The curvature of the circular boundary is relatively small, and the blood can flow more freely along the cross-section, reducing the flow resistance of the blood on the surface of the hub 12. In addition, compared with other complex shapes, the circular cross-section is easier to achieve uniform stress distribution under the same material and size conditions. This makes the hub 12 have better durability and compressive capacity, and improves the structural strength of the hub 12.

[0071] In some embodiments, please refer to Figure 4 , the blade 13 extends to one end of the hub 12 close to the connector 3, and the distance between the extended end of the blade 13 and the first end face 1a does not exceed the radius of the first end face 1a.

[0072] Please refer to Figure 4 , where the distance between the extended end of the blade 13 and the first end face 1a is S1, and the radius of the first end face 1a is R1.

[0073] That is to say, the distance from the extended end of the blade 13 to the first end face 1a is relatively small. In this way, the driving effect of the blade 13 on the blood can be relatively strong, and the blood can flow to the liquid outlet 2c relatively quickly after leaving the extended end of the blade 13, improving the pumping effect of the axial flow impeller 1 on the blood.

[0074] The method of realizing the suspension of the axial flow impeller 1 in the accommodation cavity 2a is not limited.

[0075] Exemplarily, please refer to Figure 3, a second permanent magnet assembly 14 is provided at one end of the hub 12 away from the connector 3. The blood pump includes a ferromagnetic unit 4, and the ferromagnetic unit 4 is disposed on the inner wall of the pump housing 2. Wherein, during the rotation of the axial flow impeller 1, the ferromagnetic unit 4 can form at least a radial acting force with the second electromagnetic assembly 14, so that the axial flow impeller 1 is suspended in the accommodation cavity 2a.

[0076] It can be understood that the ferromagnetic unit 4 can form at least a radial acting force with the second electromagnetic assembly 14, which includes at least two cases.

[0077] First, only a radial acting force is formed between the ferromagnetic unit 4 and the second permanent magnet assembly 14. For example, a radial repulsive force. In this way, the axial flow impeller 1 can be stably suspended in the accommodation cavity 2a under this acting force, realizing radial limit, so that one end of the hub 12 away from the connector 3 rotates stably.

[0078] Second, the acting force formed between the ferromagnetic unit 4 and the second permanent magnet assembly 14 includes two component forces, one is a radial acting force and the other is an axial acting force. The radial acting force can be a repulsive force, so that the axial flow impeller 1 can be stably suspended in the accommodation cavity 2a, realizing radial limit. The axial acting force can be balanced with the attractive force generated by the first electromagnetic assembly 31 and the first permanent magnet assembly 11 and the acting force exerted by the blood on the axial flow impeller 1. The axial flow impeller 1 can maintain force balance axially, so that one end of the hub 12 away from the connector 3 rotates stably.

[0079] It can be understood that when only a radial acting force is formed between the ferromagnetic unit 4 and the second permanent magnet assembly 14, the axial flow impeller 1 realizes radial limit. At this time, the axial flow impeller 1 is subjected to the attractive force of the first electromagnetic assembly 31 and the acting force exerted by the blood axially, and the two are balanced with each other to realize the axial limit of the axial flow impeller 1. In this way, the axial flow impeller 1 can rotate stably; when the acting force formed between the ferromagnetic unit 4 and the second permanent magnet assembly 14 includes a radial acting force and an axial acting force, the radial acting force makes the axial flow impeller 1 realize radial limit. The axial acting force can be directed towards the liquid inlet 2b side or the liquid outlet 2c side. By controlling parameters such as the current of the power supply, this axial acting force can be balanced with the attractive force of the first electromagnetic assembly 31 and the acting force exerted by the blood on the axial flow impeller 1 axially, realizing the axial limit of the axial flow impeller 1. In this way, the axial flow impeller 1 can rotate stably.

[0080] It should be noted that in the related art, the rotation of the impeller during operation is not stable enough, and the end is prone to radial shaking, reducing its working efficiency and affecting the normal use of patients.

[0081] In this embodiment, by providing the ferromagnetic unit 4, radial limitation of the end of the hub 12 away from the connector 3 can be achieved, so that the end of the hub 12 away from the connector 3 rotates stably, reducing the probability of shaking during the rotation of the axial flow impeller 1 and improving the working efficiency of the blood pump.

[0082] The specific structure of the ferromagnetic unit 4 is not limited.

[0083] In some embodiments, the ferromagnetic unit 4 includes a permanent magnet ring structure that surrounds the end of the hub 12 away from the connector 3. In this way, the permanent magnet ring structure has a simple layout and can be quickly installed on the inner wall of the pump housing 2, and the permanent magnet ring structure can continuously form a radial force with the second permanent magnet assembly 14, so that the axial flow impeller 1 is suspended in the accommodation cavity 2a.

[0084] It should be noted that "ring-shaped" means that the overall contour of the permanent magnet ring structure is cylindrical.

[0085] The permanent magnet ring structure surrounding the hub 12 means that the permanent magnet ring structure surrounds the outer periphery of the hub 12 and a certain gap is formed between the inner wall of the permanent magnet ring structure and the outer wall of the hub 12.

[0086] In other embodiments, the ferromagnetic unit 4 includes an electromagnetic ring structure that surrounds the end of the hub 12 away from the connector 3, and the electromagnetic ring structure is used to form a radial force with the second permanent magnet assembly 14 when the power is turned on.

[0087] In this way, the electromagnetic ring structure can form a radial force with the second permanent magnet assembly 14 when the power is turned on, for example, a repulsive force, so that the axial flow impeller 1 is suspended in the accommodation cavity 2a.

[0088] It can be understood that in this embodiment, relevant parameters can also be changed through a control program, so that the electromagnetic ring structure can generate a magnetic torque with the second permanent magnet assembly 14 when the power is turned on, so that the axial flow impeller 1 rotates under the action of the magnetic torques of the first electromagnetic assembly 31 and the first permanent magnet assembly 11 and the magnetic torques of the electromagnetic ring structure and the second permanent magnet assembly 14. In this way, the rotational driving forces generated by the two magnetic torques received by the axial flow impeller 1 can be superimposed on each other, so that the work done by the axial flow impeller 1 per unit time is greater, the kinetic energy and pressure potential energy of the blood are greater, and thus the blood delivery speed can be increased, the working efficiency of the blood pump can be improved, and the situation of large energy consumption in only one driving point of the first electromagnetic assembly 31 and the first permanent magnet assembly 11 can be improved, and the heat dissipated during the operation of the blood pump can be reduced, thereby solving the problem of serious overheating of the blood pump and reducing the surgical risk.

[0089] The connection method of the electromagnetic ring structure to the external power supply is not limited.

[0090] Exemplarily, the pump housing 2 has a wire routing channel that is not in communication with the accommodation cavity 2a. The wire body for connecting to the electromagnetic ring structure is led out from the inside of the connector 3 and passes through the wire routing channel.

[0091] Exemplarily, the wire routing channel can be arranged in the internal space of the wall body of the pump housing 2.

[0092] It can be understood that the pump housing 2 has a wire routing channel, and an area for the wire body to pass through is also provided at the connection between the pump housing 2 and the connector 3, so that the wire body is led out from the inside of the connector 3. For example, the connector 3 has a lead hole that penetrates the circumferential outer wall of the connector 3. One end of the wire body for connecting to the electromagnetic ring structure is led out from the inside of the connector 3 through the lead hole, passes through the wire routing channel to be connected to the electromagnetic ring structure, and the other end of the wire body is used for connection to a power source.

[0093] Exemplarily, one end of the connector 3 axially away from the pump housing 2 is connected to the lead-out member, and the other end of the wire body is led out through the inside of the connector 3 into the lead-out member, and then led out of the body to be connected to the power source. In this way, the wire body does not come into contact with the blood in the pump housing 2, does not additionally occupy the space of the accommodation cavity 2a, does not affect the blood pumping efficiency, and improves safety.

[0094] It can be understood that one end of the connecting wire connected to the first electromagnetic component 31 is located inside the connector 3 and is connected to the first electromagnetic component 31, and the other end and the wire body connected to the electromagnetic ring structure are led out from the inside of the connector 3 to be connected to the lead-out member, and then connected to the power source, so that the power source can supply power to the first electromagnetic component 31 and the electromagnetic ring structure.

[0095] Exemplarily, the lead-out member can be a catheter.

[0096] In some embodiments, please refer to Figure 1 and Figure 2 , the pump housing 2 includes at least two support members 21. The support members 21 are formed at one end of the pump housing 2 close to the liquid outlet 2c. The support members 21 are connected to the connector 3, and the support members 21 are arranged at intervals along the circumference of the pump housing 2. The interval between two adjacent support members 21 forms the liquid outlet 2c.

[0097] Here, the support member 21 can be in a strip structure.

[0098] Exemplarily, three support members 21 are formed at one end of the pump housing 2 close to the liquid outlet 2c to improve the connection strength between the support members 21 and the connector 3.

[0099] The connection method between the support member 21 and the connector 3 is not limited, and can be a detachable connection or a non-detachable connection, etc.

[0100] In some embodiments, the support member 21 is welded to the connector 3, and the connection is reliable.

[0101] In some other embodiments, a clamping groove is formed on the circumferential outer surface of the connector 3, and the support member 21 is clamped with the clamping groove. In this way, it is convenient for the disassembly, assembly and cleaning of the support member 21 and the connector 3.

[0102] The specific structure of the hub 12 is not limited.

[0103] In some embodiments, please refer to Figure 4 , the hub 12 includes a housing 121 and a cover 122. The first permanent magnet assembly 11 is disposed in the housing 121. One axial end of the housing 121 facing the connector 3 has an opening 121a, and the cover 122 is disposed at one end of the housing 121 close to the connector to close the opening 121a. In this way, by disposing the first permanent magnet assembly 11 in the housing 121 and closing one end of the opening 121a, it can be effectively isolated and protected, the influence of blood on the first permanent magnet assembly 11 can be reduced, and its stability and service life can be improved; in addition, by providing the cover 122 to seal the first permanent magnet assembly 11, the structural strength of the hub 12 is increased.

[0104] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A blood pump, characterized in that, Comprising: An axial flow impeller; A pump casing having a receiving cavity, a liquid inlet and a liquid outlet, the receiving cavity communicating with the liquid inlet and the liquid outlet, and the whole of the axial flow impeller being disposed in a region of the receiving cavity between the liquid outlet and the liquid inlet; A connector located on one axial side of the axial flow impeller and connected to an axial end of the pump casing close to the liquid outlet. One end of the connector close to the axial flow impeller has a guiding portion which extends into the pump casing. The circumferential surface of the guiding portion is a guiding surface which extends obliquely towards the liquid outlet in a direction away from the axial flow impeller for guiding blood towards the liquid outlet; The axial flow impeller has a first permanent magnet assembly, and the inside of the guiding portion has a first electromagnetic assembly which is used for generating a magnetic torque with the first permanent magnet assembly when the power is switched on, so that the axial flow impeller rotates under the action of the magnetic torque.

2. The blood pump according to claim 1, wherein The axial flow impeller includes a hub and blades disposed on the hub. The blood pump includes a ferromagnetic unit. A second permanent magnet assembly is disposed at one end of the hub away from the connector, and the ferromagnetic unit is disposed on the inner wall of the pump casing. Wherein, during the rotation of the axial flow impeller, the ferromagnetic unit can form at least a radial acting force with the second permanent magnet assembly so that the axial flow impeller floats in the receiving cavity.

3. The blood pump according to claim 2, characterized in that, The ferromagnetic unit includes a permanent magnet ring structure surrounding one end of the hub away from the connector.

4. The blood pump according to claim 2, characterized in that, The ferromagnetic unit includes an electromagnetic ring structure surrounding one end of the hub away from the connector, and the electromagnetic ring structure is used for forming a radial acting force with the second permanent magnet assembly when the power is switched on.

5. The blood pump according to claim 1, wherein, One side of the axial flow impeller facing the connector has a first end face, and one side of the guiding portion facing the axial flow impeller has a second end face. The first end face and the second end face face each other. When the first electromagnetic assembly is powered on, a magnetic floating gap can be formed between the first end face and the second end face under the interaction of the first permanent magnet assembly and the first electromagnetic assembly.

6. The blood pump according to claim 5, characterized in that, When the first electromagnetic assembly is powered off, the first end face and the second end face are in contact with each other under the interaction of the first permanent magnet assembly and the first electromagnetic assembly.

7. The blood pump according to claim 5, characterized in that, The first end face and the second end face are parallel to each other.

8. The blood pump according to claim 5, characterized in that, The outer diameter of the first end face is 0.9 to 1.1 times the outer diameter of the second end face.

9. The blood pump according to claim 1, characterized in that, The axial flow impeller includes a hub and blades disposed on the hub. Along the axial direction towards the connector, the outer diameter of the hub continuously increases.

10. The blood pump according to claim 9, characterized in that, The circumferential surface of the hub is a convex arc surface.

11. The blood pump according to claim 9, characterized in that, One side of the axial flow impeller facing the connector has a first end face, and the blades extend to one end of the hub close to the connector. The distance between the extending end of the blade and the first end face does not exceed the radius of the first end face.

12. The blood pump according to claim 1, wherein The axial flow impeller includes a hub and blades, the blades are arranged on the hub, the hub includes a housing and a cover body, the first permanent magnet assembly is arranged in the housing, the housing has an opening at an axial end facing the connector, and the cover body is arranged at an end of the housing close to the connector and closes the opening.

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