A centrifugal impeller for a blood pump, a blood pump

Abstract

The application discloses a centrifugal impeller for blood pump and a blood pump. The centrifugal impeller for blood pump comprises a bottom plate, which is circular, and a through hole is formed in the middle of the bottom plate to form a secondary flow channel; centrifugal blades are arranged on the upper surface of the bottom plate, the centrifugal blades are banana-shaped blades with thick middle and thin ends, and the wrap angle is greater than or equal to 90 DEG and extends radially from the outer edge of the through hole to the outer periphery of the bottom plate; a support structure comprises a support shaft and support blades, the support shaft is arranged at the center of the through hole, one end of the support blade is connected with the support shaft, and the other end is connected with the bottom plate. The banana-shaped blade configuration with a wrap angle greater than or equal to 90 DEG can reduce blood injury and thrombosis in the impeller. The support structure arranged in the through hole of the bottom plate can support the high-speed rotation of the centrifugal impeller, increase the overall structural strength and stability, the blood flow rate in the secondary flow channel can be increased by arranging the support blades, and thrombosis can be avoided and the rotor dynamic balance can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotors, in particular to a centrifugal impeller for blood pump and a blood pump. BACKGROUND

[0002] A blood pump is a medical device that can assist the circulation of human blood, and is often used in extracorporeal circulation support and heart failure treatment. The blood pump is also an important component of an extracorporeal membrane oxygenation (ECMO) system. The blood pump commonly used in clinical practice is a magnetic coupling driven blood pump. The magnetic coupling driven motor outside the pump head drives the centrifugal impeller inside the pump head to rotate and push the blood circulation. The high-speed rotation of the centrifugal impeller leads to the occurrence of turbulent flow in the impeller. The existence of these turbulent flows will affect the flow and reduce the hydraulic performance of the blood pump. On the other hand, the turbulent flow often contains a large non-physiological shear force, and the disturbance of the turbulent flow to the flow field will also form a large number of flow stagnation zones. The upper center of the centrifugal impeller is usually the place where the main flow and the secondary flow collide and converge, and a large energy loss and a high non-physiological shear force often occur, which will also lead to a reduction in the hydraulic performance of the blood pump. In addition, below the center of the centrifugal impeller, near the secondary flow channel, the blood flow is slow, making it easy for blood to accumulate in the secondary flow channel area. The existence of non-physiological high shear force will inevitably cause damage to blood cells and proteins (such as destroying red blood cells and activating platelets), and the existence of flow stagnation zones will cause blood accumulation, further leading to the formation of thrombus. More seriously, once thrombus occurs at the bearing, it is easy to destroy the dynamic balance, leading to rotor instability, and thus causing the blood pump to fail, which may cause serious clinical accidents. At the same time, since modern centrifugal blood pumps mostly use magnetic coupling driving method, when the rotor starts or the speed changes, a large lift force is easily generated. This lift force needs to be precisely balanced with the liquid pressure borne by the rotor to ensure the stable operation of the blood pump. SUMMARY

[0003] (I) Invention purposes

[0004] The purpose of the present application is to provide a centrifugal impeller for blood pump that avoids or reduces blood damage and blood accumulation and improves rotor dynamic balance.

[0005] (II) Technical solutions

[0006] To solve the above problems, the first aspect of the embodiment of the present application provides a centrifugal impeller for blood pump, comprising:

[0007] The bottom plate is circular, and a through hole is formed in the middle of the bottom plate to form a secondary flow channel;

[0008] A plurality of centrifugal blades are arranged on the upper surface of the bottom plate, the centrifugal blades are banana-shaped blades with thick middle and thin ends, the included angle of the centrifugal blades is greater than or equal to 90°, and the plurality of centrifugal blades extend radially from the outer edge of the through hole to the outer periphery of the bottom plate.

[0009] A support structure includes a support shaft arranged at the center of the through hole and a support blade having one end connected to the support shaft and the other end connected to the bottom plate.

[0010] In some embodiments, the plurality of support blades extend radially from the center of the top surface of the support shaft to the inner peripheral wall of the through hole.

[0011] In some embodiments, the centrifugal blade includes a tip portion close to the support structure and a root portion away from the support structure, and the height of the tip portion is higher than the height of the root portion.

[0012] In some embodiments, the centrifugal blade is curved in the direction of rotation of the centrifugal impeller, and the support blade is curved in the opposite direction of the centrifugal blade.

[0013] In some embodiments, the number of centrifugal blades is greater than or equal to 3, and the centrifugal blades are uniformly distributed along the circumference of the through hole.

[0014] In some embodiments, the number of support blades is greater than or equal to 3, and the support blades are uniformly distributed along the circumference of the through hole.

[0015] In some embodiments, the height of the centrifugal blade along the axis of the centrifugal impeller is greater than the depth of the through hole.

[0016] In some embodiments, the included angle of the support blade is greater than or equal to 10°.

[0017] In some embodiments, the support shaft is a semispherical shape that protrudes upward.

[0018] The second aspect of the embodiments of the present application provides a blood pump, which includes the centrifugal impeller for blood pump provided by any of the above embodiments.

[0019] (III) Beneficial Effects

[0020] The above technical solutions of the present application have the following beneficial technical effects:

[0021] This invention utilizes banana-shaped blades, thicker in the middle and thinner at both ends, on the upper surface of the base plate to reduce non-physiological shear forces and blood damage caused by the narrow effective flow area at the impeller inlet and outlet. Simultaneously, the blades' wrap angle is greater than or equal to 90°, which constrains the flow within the impeller, preventing flow stagnation zones caused by flow separation and thus avoiding thrombus formation. A support structure within the through-holes of the base plate supports the high-speed rotation of the centrifugal impeller, maintaining balance during rotation and increasing overall structural strength and stability. The support blades, with their curvature opposite to that of the centrifugal blades, increase the blood velocity in the secondary flow channel, reducing collisions between the secondary and main flow, and improving the flow field near the support shaft to prevent blood stasis and thrombus formation. Furthermore, the increased flow velocity in the secondary flow channel converts pressure into velocity energy, increasing the velocity in the lower cavity and preventing blood stasis there, thus reducing the likelihood of thrombus formation. The reduced pressure energy in the lower cavity also reduces the upward lift force exerted by the lower cavity on the circular base plate, improving the rotor's dynamic balance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a centrifugal impeller for a blood pump in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A three-dimensional diagram of a centrifugal impeller used in a blood pump;

[0024] Figure 3 This is a schematic diagram of a support structure according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a blood pump according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram showing the relationship between the wrap angle of the centrifugal blades and the shear force in a blood pump according to an embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram showing the relationship between the wrap angle of the centrifugal blades and the hemolysis index of a blood pump in an embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the blood flow velocity distribution of a blood pump according to an embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram showing the relationship between the centrifugal blade wrap angle and the average blood retention time in a blood pump according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic diagram illustrating the relationship between the wrap angle of the centrifugal blades of a blood pump and the probability of thrombosis in an embodiment of the present invention.

[0031] Reference signs:

[0032] Base plate, 1; through hole, 11;

[0033] Centrifugal blade, 2; blade tip, 21; blade root, 22;

[0034] Supporting structure, 3; supporting shaft, 31; supporting blade, 32;

[0035] Housing, 4; base, 41; blood inlet, 42; first chamber, 43; second chamber, 44; third chamber, 45. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present application clearer, further detailed description will be made to the present application with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are only exemplary, and are not intended to limit the scope of the present application. In addition, in the following description, the description of the well-known structures and technologies will be omitted to avoid unnecessary confusion of the concept of the present application.

[0037] The schematic diagrams according to the embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, and some details can be omitted for the purpose of clarity. The various regions shown in the drawings and their relative sizes and positional relationships are only exemplary, and in actuality, they can be deviated due to manufacturing tolerances or technical limitations, and regions with different shapes, sizes, and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0038] Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0039] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict. The present application will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are denoted by similar reference signs. Each part in the drawings is not drawn to scale for the purpose of clarity.

[0040] Figure 1 is a structural schematic diagram of a centrifugal impeller for a blood pump in an embodiment of the present application, Figure 2 is Figure 1 is a perspective view of a centrifugal impeller for a blood pump in an embodiment of the present application. As Figure 1 , Figure 2As shown, in the first embodiment of the present application, a centrifugal impeller for blood pump is provided, which comprises a bottom plate 1, centrifugal blades 2 and a support structure 3. The bottom plate 1 is circular, and a permanent magnet is embedded in the bottom plate 1. The axis of the bottom plate 1 is the same as the axis of the centrifugal impeller. A through hole 11 is formed in the center of the bottom plate 1 to form a secondary flow channel. The through hole 11 is circular, and the diameter of the secondary flow channel is one-tenth to one-half of the diameter of the bottom plate 1. The thickness of the bottom plate 1 gradually increases from the center to the periphery. The top surface of the bottom plate 1 is in the same horizontal plane, and the side surface of the bottom plate 1 extends downward from the top surface and inclines to the axis of the centrifugal impeller. The centrifugal blades 2 are arranged on the upper surface of the bottom plate 1. The number of the centrifugal blades 2 is greater than or equal to 3. The centrifugal blades 2 extend radially from the outer edge of the through hole 11 to the periphery of the bottom plate 1 and are uniformly distributed along the circumference of the bottom plate 1. The centrifugal blades 2 are curved in the direction of rotation of the centrifugal impeller to drive the blood to flow to the periphery of the bottom plate 1. The support structure 3 comprises a support shaft 31 and support blades 32. The support shaft 31 is arranged in the center of the through hole 11. One end of the support blade 32 is connected to the support shaft 31, and the other end is connected to the bottom plate 1. The number of the support blades 32 is greater than or equal to 3, and the support blades 32 are uniformly distributed along the circumference of the through hole 11. The support blades 32 are curved in the opposite direction of the centrifugal blades 2 to make the blood gather to the center of the bottom plate 1.

[0041] The present application can support the high-speed rotation of the centrifugal impeller by arranging the support structure 3 in the through hole 11 of the bottom plate 1, maintain dynamic balance during rotation, increase the overall structural strength and stability, and increase the blood flow rate in the secondary flow channel by arranging the support blades 32 to avoid blood stasis and thrombosis. At the same time, the increase of the flow rate in the secondary flow channel can convert the pressure energy in the secondary flow channel into kinetic energy, reduce the pressure in the cavity below the bottom plate 1, and thus reduce the flow resistance in the cavity below the bottom plate 1. In this case, on the one hand, the blood in the cavity below the bottom plate 1 can flow out smoothly, reducing the possibility of thrombosis in the cavity below the bottom plate 1; on the other hand, the increase of the flow rate of the lower cavity 5 also reduces the pressure energy of the cavity below the bottom plate 1, thereby reducing the upward lift generated by the cavity below the bottom plate 1 on the rotor, further improving the dynamic balance of the rotor, and ensuring the stable operation of the entire blood pump.

[0042] In some embodiments, the centrifugal blade includes a blade root portion near the through hole and a blade tip portion extending away from the through hole, the blade root portion gradually increases in thickness along a direction away from the through hole, the blade tip portion gradually decreases in thickness along the direction away from the through hole, the blade root portion gradually increases in width along the direction away from the through hole, and the blade tip portion gradually decreases in width to zero along the direction away from the through hole. The centrifugal blade is a banana-shaped blade with a large wrap angle, and the height of the blade tip portion near the rotating center is higher than the height of the blade root portion away from the centrifugal center. This design can improve the blood flow near the impeller, reduce the damage to the blood caused by high-speed rotation of the impeller, and improve the hydraulic performance of the blood pump. The banana-shaped blade configuration is beneficial to reduce the shear force at the inlet and outlet of the impeller and avoid blood damage. At the same time, the design of the large wrap angle also enhances the restriction of the blade on the blood flow in the impeller, avoiding or reducing the blood stasis and thrombosis caused by flow separation in the impeller. Unlike the conventional support blade, the wrap angle of each support blade in the present application is greater than or equal to 10°, and the bending direction of the support blade is opposite to that of the centrifugal blade. This design can reduce the collision between the secondary flow and the main flow, improve the flow field near the rotor, and improve the compatibility of the blood in the blood pump. The centrifugal impeller of the blood pump can support the high-speed rotation of the centrifugal impeller by setting the support structure in the through hole of the bottom plate, maintain balance during rotation, increase the overall structural strength and stability, and increase the blood flow rate in the secondary flow passage by setting the support blade to avoid blood stasis and thrombosis. At the same time, the increase of the flow rate in the secondary flow passage can convert the pressure in the secondary flow passage into velocity energy, reduce the pressure in the cavity below the bottom plate, avoid or reduce the lift of the bottom plate by the cavity below, and thus improve the dynamic balance of the rotor.

[0043] In some embodiments, the centrifugal blade 2 includes a blade tip portion 21 near the through hole 11 and a blade root portion 22 extending away from the through hole 11, and the height of the blade tip portion 21 is higher than that of the blade root portion 22. The blade tip portion 21 gradually increases in thickness along a direction away from the through hole 11, the blade root portion 22 gradually decreases in thickness along the direction away from the through hole 11, the blade tip portion 21 gradually increases in width along the direction away from the through hole 11, and the blade root portion 22 gradually decreases in width to zero along the direction away from the through hole 11. The banana-shaped blade design is beneficial to increase the effective flow area at the inlet and outlet regions of the impeller, thereby reducing the flow velocity gradient and shear force near the inlet and outlet regions to avoid or reduce damage to the blood. The angle a (blade wrap angle) between the blade tip portion 21 and the blade root portion 22 and the center of rotation of the impeller is greater than or equal to 90°, so as to enhance the restriction on the flow in the impeller and avoid blood damage and flow stagnation caused by flow separation in the impeller. In some embodiments, the wrap angle a of the centrifugal blade 2 is greater than or equal to 100° and less than or equal to 150°. At the same time, the banana-shaped blade design with a wrap angle greater than or equal to 90° is beneficial to improve the flow and improve the hydraulic performance of the blood pump.

[0044] In some embodiments, a plurality of support blades 32 extend radially from the center of the top surface of the support shaft 31 toward the inner peripheral wall of the through hole 11. The width of the support blades 32 gradually increases along the extension direction to twice the depth of the through hole 11 and then gradually decreases. The support blades 32 are curved arc-shaped, and the bending direction is opposite to the bending direction of the blade 2.

[0045] Figure 3 This is a schematic diagram of a support structure according to an embodiment of the present invention. Figure 3 As shown, the wrap angle b of the supporting blade is greater than or equal to 10° to enhance the constraint on blood flow within the through hole 11, avoid the formation of a flow stagnation zone above the supporting shaft 31, and reduce the probability of thrombosis. In some embodiments, the wrap angle b of the blade is greater than or equal to 10° and less than or equal to 100°.

[0046] Figure 4 This is a schematic diagram of the structure of a blood pump according to an embodiment of the present invention. Figure 4As shown, the blood pump comprises a housing 4 and a centrifugal impeller arranged in the housing 4, the center of the bottom surface of the housing 4 comprises an upwardly protruding base 41, the bottom surface of the shaft 31 supporting the centrifugal impeller comprises a groove matched with the base 41, and the centrifugal impeller is supported on the base 41 through the groove. The lower part of the bottom surface of the housing 4 comprises a magnetic suspension element for controlling the rotation of a permanent magnet in the centrifugal impeller, thereby driving the rotation of the centrifugal impeller. The center of the top surface of the housing 4 comprises a blood inlet 42, and the housing 4 comprises a first chamber 43, a second chamber 44 and a third chamber 45. The first chamber 43 is arranged above the centrifugal impeller, the second chamber 44 is annular and arranged above the outer periphery of the centrifugal impeller, and the third chamber 45 is arranged below the centrifugal impeller. The arrows represent the flow direction of the blood. During the rotation of the centrifugal impeller, the blood is sucked from the blood inlet 42 into the first chamber 43, and the blood in the first chamber 43 flows into the second chamber 44 to form a main flow after being accelerated by the centrifugal impeller. The banana-shaped blade design with an included angle greater than or equal to 90° can reduce the high shear force in the first chamber 43 and regulate the flow of blood in the first chamber 43, improve the hydraulic performance of the blood pump and reduce or avoid blood damage caused by non-physiological shear force in the first chamber 43 and blood stasis and thrombus formation caused by flow stagnation. Due to the pressure difference between the first chamber 43, the second chamber 44 and the third chamber 45, part of the blood in the second chamber 44 backflows into the first chamber 43 or the third chamber 45. The blood in the third chamber 45 returns to the first chamber 43 from the secondary flow passage to form a secondary flow, and the blood flow in the secondary flow is slow, which is easy to cause blood stasis near the third chamber 45 and the supporting shaft 31, resulting in thrombosis. Once the thrombosis is formed, it will destroy the dynamic balance of the rotor, causing the blood pump to fail. In addition, when the blood in the secondary flow enters the first chamber 43, it collides with the blood in the main flow, which will reduce the hydraulic performance of the blood pump. The main flow and the secondary flow collide at the top surface of the supporting shaft 31, resulting in energy loss and non-physiological shear force, which is easy to cause damage to blood cells and proteins, such as destroying red blood cells and activating platelets. The present embodiment is helpful to improve the flow rate of the secondary flow by arranging a plurality of centrifugal blades 2, thereby avoiding the formation of thrombosis caused by blood stasis. The supporting blade 32 is bent in the opposite direction of the centrifugal blade 2, so that the blood in the secondary flow is gathered to the center of the top surface of the supporting shaft 31, reducing the collision between the secondary flow and the main flow, improving the compatibility of the blood in the blood pump, and thereby reducing the incidence of complications during clinical blood circulation assistance.

[0047] Figure 5 is a schematic diagram of the relationship between the included angle of the centrifugal blade of a blood pump and the shear force in the embodiment of the present application. Figure 6 is a schematic diagram of the relationship between the included angle of the centrifugal blade of a blood pump and the hemolysis index in the embodiment of the present application. Figure 7 is a schematic diagram of the blood flow rate distribution of a blood pump in the embodiment of the present application. Figure 8is a schematic diagram of the relationship between the wrap angle of the centrifugal blade of a blood pump and the average residence time of blood in the embodiments of the present application. Figure 9 is a schematic diagram of the relationship between the wrap angle of the centrifugal blade of a blood pump and the thrombosis probability in the embodiments of the present application.

[0048] Figure 5 is a schematic diagram of the relationship between the wrap angle of the centrifugal blade of a blood pump and the shear force in the embodiments of the present application. As shown in the figure, Figure 5 the abscissa is the wrap angle of the centrifugal blade 2, and the ordinate is the volume of blood in the blood pump subjected to shear force greater than 100 Pa. The greater the shear force on the blood, the greater the damage to the blood. Experimental data show that as the wrap angle increases, the volume of non-physiological shear force greater than 100 Pa gradually decreases, and the damage to red blood cells gradually decreases. When the wrap angle increases to 90°, the decrease in the volume of non-physiological shear force greater than 100 Pa is small. When the wrap angle increases to the critical angle of 90° and 130°, the decrease in the volume of non-physiological shear force greater than 100 Pa is significantly increased. When the wrap angle is greater than 150°, there is no non-physiological shear force greater than 100 Pa. Experimental results show that increasing the wrap angle of the centrifugal blade helps to reduce the damage to red blood cells.

[0049] Figure 6 is a schematic diagram of the relationship between the wrap angle of the centrifugal blade of a blood pump and the hemolysis index in the embodiments of the present application. As shown in the figure, Figure 6 the abscissa is the wrap angle of the centrifugal blade 2, and the ordinate is the normalized hemolysis index. The lower the hemolysis index of the blood, the better the performance of the blood pump. Damage to red blood cells will cause the hemolysis index to rise. Experimental data show that as the wrap angle increases, the hemolysis index of the blood gradually decreases. When the wrap angle increases to 90°, the decrease in the hemolysis index of the blood is small. When the wrap angle increases to the critical angle of 90°, the decrease in the hemolysis index is significantly increased. As the wrap angle increases, the hemolysis index continues to decrease. Experimental results show that increasing the wrap angle of the centrifugal blade helps to reduce the hemolysis index.

[0050] Figure 7 is a schematic diagram of the blood flow rate distribution of a blood pump in the embodiments of the present application. As shown in the figure, Figure 7 when the wrap angle is 0°, there is a large amount of flow separation in the impeller flow passage, and the uniformity of the blood flow rate distribution is poor. When the wrap angle is 110°, the uniformity of the blood flow rate distribution is better than when the wrap angle is 0°. When the wrap angle is 150°, the uniformity of the blood flow rate distribution is better than when the wrap angle is 110°. Experimental results show that increasing the wrap angle of the centrifugal blade helps to suppress flow separation and regulate flow in the blood impeller.

[0051] Figure 8 is a schematic diagram of the relationship between the wrap angle of the centrifugal blade of a blood pump and the average residence time of blood in the embodiments of the present application. As shown in the figure, Figure 8As shown, the horizontal axis represents the wrap angle of centrifuge blade 2, and the vertical axis represents the normalized mean blood retention time. A lower mean blood retention time indicates a lower probability of thrombus formation and better pump performance. Experimental data shows that the mean blood retention time gradually decreases as the wrap angle increases. The experimental results indicate that increasing the wrap angle of the centrifuge blades helps to reduce the mean blood retention time.

[0052] Figure 9 This is a schematic diagram illustrating the relationship between the centrifugal blade wrap angle of a blood pump and the probability of thrombosis in an embodiment of the present invention. Figure 9 As shown, the horizontal axis represents the wrap angle of centrifuge blade 2, and the vertical axis represents the probability of thrombosis. Experimental data show that the probability of thrombosis gradually decreases as the wrap angle increases. When the wrap angle increases to a critical angle of 110°, the probability of thrombosis decreases significantly. The experimental results indicate that increasing the wrap angle of the centrifuge blade helps to reduce the probability of thrombosis.

[0053] The present invention has been described above with reference to embodiments thereof. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A centrifugal impeller for a blood pump, characterized in that The centrifugal impeller comprises: a bottom plate, which is circular, and a through hole is formed in the middle of the bottom plate to form a secondary flow channel; centrifugal blades arranged on the upper surface of the bottom plate, the centrifugal blades being banana-shaped blades with thick middle and thin ends, the wrap angle of the centrifugal blades being greater than or equal to 90°, and a plurality of the centrifugal blades extending radially from the outer edge of the through hole to the outer periphery of the bottom plate; a support structure comprising a support shaft and support blades, the support shaft being arranged at the center of the through hole, one end of the support blades being connected to the support shaft, and the other end being connected to the bottom plate; the centrifugal blades are curved in the direction of rotation of the centrifugal impeller, and the support blades are curved in the opposite direction of the centrifugal blades; a plurality of the support blades extend radially from the center of the top surface of the support shaft to the inner peripheral wall of the through hole.

2. The centrifugal impeller for a blood pump according to claim 1, wherein: the centrifugal blades comprise blade tip portions close to the support structure and blade root portions away from the support structure, the height of the blade tip portions being higher than the height of the blade root portions.

3. The centrifugal impeller for a blood pump according to claim 1, characterized in that the number of the centrifugal blades is greater than or equal to 3, and the centrifugal blades are uniformly distributed along the circumference of the through hole.

4. The centrifugal impeller for a blood pump according to claim 1, characterized in that the number of the support blades is greater than or equal to 3, and the support blades are uniformly distributed along the circumference of the through hole.

5. The centrifugal impeller for a blood pump according to claim 1, characterized in that the height of the centrifugal blades in the direction of the centrifugal impeller axis is greater than the depth of the through hole.

6. The centrifugal impeller for a blood pump according to claim 1, characterized in that the wrap angle of the support blades is greater than or equal to 10°.

7. The centrifugal impeller for a blood pump according to any one of claims 1 to 6, characterized in that the support shaft is a semispherical shape that is convex upward.

8. A blood pump, characterized by a blood pump comprising the centrifugal impeller according to any one of claims 1-7.

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