A centrifugal blood pump

Abstract

The present invention proposes a centrifugal blood pump, comprising: a blood pump rotor, comprising a rotor body and a blade group arranged at one end of the rotor body; a blood pump housing, having a housing chamber, in which the blood pump rotor is located; a reflux flow hole, which passes through both axial ends of the rotor body; a gap between the rotor body and the blood pump housing, the reflux flow hole being connected to the gap to form a secondary flow channel for blood; a plurality of diffusers arranged on the inner wall surface of the blood pump housing; a diffuser flow channel formed between adjacent diffusers, the diffuser flow channel gradually widening from the center to the periphery of the blood pump housing; a liquid inlet, which is arranged at one end of the blood pump housing; a liquid outlet, which is arranged at the periphery of the liquid inlet, and the liquid outlet and the liquid inlet are both located at the same end of the blood pump housing; the liquid inlet is connected to the diffuser flow channel and the secondary flow channel, and the diffuser flow channel is connected to the liquid outlet. The centrifugal blood pump of the present invention reduces blood damage caused by repeated agitation of the blades during blood circulation, and at the same time, reduces the circulation volume of the secondary flow and increases the secondary flow velocity.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a centrifugal blood pump. Background Art

[0002] The blood pump is the core component of the extracorporeal membrane oxygenation (ECMO) system, replacing the heart's function of pumping blood to promote blood circulation. The blood pump is also an important component of the ventricular assist device, used to partially or completely replace the function of the heart in heart failure. The centrifugal blood pump system currently commonly used in clinical practice is magnetically coupled driven, consisting of a blood pump and a magnetically coupled drive device outside the blood pump. The interior of the blood pump consists of a high-speed rotating rotor and an outer casing. The complex configuration and mechanical movement of previous blood pumps inevitably lead to complex flows in the blood pump and cause blood damage. For example, the high-speed rotation and complex flow field of the blood pump lead to the generation of non-physiological shear forces. In particular, the blood in the existing blood pump easily circulates between the rotating periphery of the blood pump rotor and the outer casing, increasing the risk of blood damage. Summary of the Invention

[0003] The purpose of the present invention is to provide a centrifugal blood pump to solve the problem of non-physiological shear force caused by high-speed rotation and complex flow field of the blood pump. In particular, the blood in the existing blood pump easily circulates between the rotating periphery of the blood pump rotor and the outer casing, increasing the risk of blood damage.

[0004] To solve the above technical problems, according to some embodiments, the present application provides a centrifugal blood pump, characterized in that it includes:

[0005] A blood pump rotor comprising a rotor body and a blade assembly provided at one end of the rotor body;

[0006] A blood pump housing having a receiving cavity, wherein the blood pump rotor is located in the receiving cavity;

[0007] A return flow hole passes through both ends of the rotor body in the axial direction;

[0008] There is a gap between the rotor body and the blood pump housing, and the reflux hole is connected to the gap to form a secondary flow channel for blood;

[0009] A plurality of pressure diffusers are provided on the inner wall surface of the blood pump housing;

[0010] A pressure diffusion channel is formed between adjacent pressure diffusion parts, and the pressure diffusion channel gradually widens from the center to the periphery of the blood pump housing;

[0011] a liquid inlet, provided at one end of the blood pump housing;

[0012] a liquid outlet, disposed on the periphery of the liquid inlet, and the liquid outlet and the liquid inlet are both located at the same end of the blood pump housing;

[0013] The liquid inlet is communicated with the diffuser flow channel and the secondary flow channel, and the diffuser flow channel is communicated with the liquid outlet.

[0014] Furthermore, the inner wall surface of the blood pump housing includes a first inner wall and a second inner wall that are coaxial;

[0015] The radius of the first inner wall is greater than the radius of the second inner wall;

[0016] One end of the first inner wall is a through opening, and the other end is connected to one end of the second inner wall through the annular first bottom surface;

[0017] The other end of the second inner wall is closed by a second bottom surface; the diffuser is provided on the first bottom surface and extends axially along the first inner wall.

[0018] The rotor body is adapted to the cavity formed by the second inner wall surface and the second bottom surface.

[0019] Further, the blood pump housing includes: an upper housing and a lower housing;

[0020] The liquid inlet is arranged on the upper shell;

[0021] The upper housing further comprises a blood output wall and a transition portion connecting the liquid inlet and the blood output wall;

[0022] The blood output wall and the first inner wall located on the lower shell form the liquid outlet.

[0023] Furthermore, the outer circumferential radius of the blade assembly is greater than the outer circumferential radius of the rotor body.

[0024] Furthermore, the blade group includes: main blades and splitter blades;

[0025] The main blade is longer in radial direction than the splitter blade;

[0026] The main blades and splitter blades are arranged alternately.

[0027] Furthermore, the pressure diffuser has a flow guide portion extending axially along the first inner wall;

[0028] The plurality of guide portions separate the liquid outlet into a plurality of guide channels;

[0029] The blade flow channels between adjacent main blades and the guide channel constitute a blood output flow channel.

[0030] Furthermore, the diffuser flow channel formed between every two adjacent diffusers is spiral-shaped.

[0031] Furthermore, the reflux holes are provided between adjacent main blades;

[0032] The circumferential radius of the return flow hole is greater than the distance from the main blade to the axis of the blood pump rotor, and smaller than the distance from the splitter blade to the axis of the blood pump rotor.

[0033] Furthermore, the rotor body is provided with a guide cone, the diameter of the guide cone gradually increases along the axial direction toward one end close to the second bottom surface, and the blade group is arranged on the guide cone.

[0034] Furthermore, the centrifugal blood pump further includes a liquid inlet tube;

[0035] One end of the liquid inlet tube is connected to the liquid inlet, and the other end passes through the center of the oxygenator; or,

[0036] One end of the liquid inlet tube is connected to the liquid inlet, the other end of the liquid inlet tube passes through the pressure diffuser, and the liquid inlet tube protrudes from the outer periphery of the blood pump housing.

[0037] The present invention provides a centrifugal blood pump, comprising: a blood pump rotor, comprising a rotor body and a blade group arranged at one end of the rotor body; a blood pump housing, having an accommodating cavity, and the blood pump rotor is located in the accommodating cavity; a reflux flow hole, running through both axial ends of the rotor body; a gap between the rotor body and the blood pump housing, and the reflux flow hole is connected to the gap to form a secondary flow channel for blood; a plurality of diffusers are arranged on the inner wall surface of the blood pump housing; a diffuser flow channel is formed between adjacent diffusers, and the diffuser flow channel gradually widens from the center to the periphery of the blood pump housing; a liquid inlet is arranged at one end of the blood pump housing; a liquid outlet is arranged on the periphery of the liquid inlet, and the liquid outlet and the liquid inlet are both located at the same end of the blood pump housing; the liquid inlet is connected to the diffuser flow channel and the secondary flow channel, and the diffuser flow channel is connected to the liquid outlet.

[0038] The above technical solution of the present invention has at least the following beneficial technical effects:

[0039] (1) The centrifugal blood pump provided in this application can, on the one hand, enable the blood pump to be directly connected to the oxygenator, allowing blood to enter the oxygenator evenly from all directions, thereby reducing the volume of the ECMO system and improving portability.

[0040] (2) The blood pump of the present invention can reduce blood damage caused by repeated agitation of the blades during blood circulation caused by the blood pump volute. At the same time, it can reduce the circulation volume of the secondary flow and increase the secondary flow velocity, thereby improving the blood pump efficiency and reducing the risk of blood damage and blood stasis. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 is a schematic half-section diagram of a centrifugal blood pump according to an embodiment of the present invention;

[0043] Figure 2 is a perspective schematic diagram of a blood pump rotor according to an embodiment of the present invention;

[0044] Figure 3 is a perspective schematic diagram of a centrifugal blood pump according to an embodiment of the present invention;

[0045] Figure 4 is a perspective schematic diagram of a centrifugal blood pump according to another embodiment of the present invention;

[0046] Figure 5 is a three-dimensional anatomical diagram of a centrifugal blood pump according to an embodiment of the present invention;

[0047] Figure 6 FIG. 1 is a cross-sectional schematic diagram of a centrifugal blood pump according to another embodiment of the present invention.

[0048] Reference numerals:

[0049] 101. Liquid inlet; 102. Liquid inlet pipe; 103. Blood output wall; 210. First inner wall; 212. First bottom surface; 220. Second inner wall; 222. Second bottom surface; 230. Diffuser; 300. Blood pump rotor; 310. Rotor body; 320. Blade assembly; 321. Main blade; 322. Diverter blade; 330. Reflux hole; 400. Liquid outlet; 500. Blood pump housing. DETAILED DESCRIPTION

[0050] Currently, in the existing technology, blood in a centrifugal blood pump easily circulates between the rotating periphery of the centrifugal blood pump rotor and the outer casing. The blood in the circulating area is repeatedly agitated by the blades, which can easily cause blood damage. At the same time, the secondary flow circulation of the centrifugal blood pump is large but the speed is low, resulting in low efficiency of the centrifugal blood pump and a high risk of blood damage and blood congestion. The centrifugal blood pump is assembled with multiple ports of the oxygenator, which increases the probability of failure.

[0051] To solve the above problems, an embodiment of the present invention provides a centrifugal blood pump, comprising: a blood pump rotor 300, comprising a rotor body 310 and a blade assembly 320 provided at one end of the rotor body 310; a blood pump housing 500, having a receiving cavity, wherein the blood pump rotor 300 is located; a return flow hole 330, which passes through both ends of the rotor body 310 in the axial direction; a gap between the rotor body 310 and the blood pump housing 500, wherein the return flow hole 330 is connected to the gap to form a secondary flow path for blood; A diffuser portion 230 is arranged on the inner wall surface of the blood pump housing 500; a diffuser flow channel is formed between adjacent diffusers 230, and the diffuser flow channel gradually widens from the center to the periphery of the blood pump housing 500; the liquid inlet 101 is arranged at one end of the blood pump housing 500; the liquid outlet 400 is arranged on the periphery of the liquid inlet 101, and the liquid outlet 400 and the liquid inlet 101 are both located at the same end of the blood pump housing 500; the liquid inlet 101 is connected to the diffuser flow channel and the secondary flow channel, and the diffuser flow channel is connected to the liquid outlet 400.

[0052] In this technical solution, if Figure 1 As shown, the rotor body 310 is internally provided with a magnet housing cavity for securing permanent magnets. The permanent magnets form a magnetic coupling with a magnetic coupling drive device external to the centrifugal blood pump, allowing the centrifugal blood pump rotor 300 to suspend within the centrifugal blood pump housing 500 and drive the blood pump rotor 300 to rotate, providing power for the centrifugal blood pump. Multiple diffusers 230 are disposed on the inner wall of the centrifugal blood pump housing 500. Adjacent diffusers 230 form diffuser channels that gradually widen from the center of the centrifugal blood pump housing 500 toward the periphery. Because pressure is proportional to area at the same pressure, blood experiences lower pressure in areas with smaller cross-sectional areas than in areas with larger cross-sectional areas. Driven by the blade assembly 320 of the centrifugal blood pump rotor 300, the blood undergoes centrifugal motion. The diffuser channels formed by adjacent diffusers 230 can pressurize the flowing blood, converting velocity energy into pressure energy. The liquid inlet 101 is located at one end of the centrifugal blood pump housing 500; the liquid outlet 400 is located on the periphery of the liquid inlet 101. The liquid outlet 400 and the liquid inlet 101 are both located at the same end of the blood pump housing 500. This allows the centrifugal blood pump to be directly and integrally connected to the oxygenator at one end, reducing the volume of the ECMO system and improving its portability. It also allows blood to enter the oxygenator evenly from all directions. On the other hand, the reflux hole 330 extends through both axial ends of the rotor body 310. A gap is provided between the rotor body 310 and the blood pump housing 500, and the reflux hole 330 is connected to the gap to form a secondary flow channel for blood. This avoids power loss and reduces blood damage caused by repeated agitation by the blades during blood circulation. It also improves the low-speed secondary flow in the centrifugal blood pump, improves the efficiency of the centrifugal blood pump, and reduces the risk of blood damage and blood stasis.

[0053] In one embodiment of the present invention, the inner wall surface of the blood pump housing 500 includes a coaxial first inner wall 210 and a second inner wall 220; the radius of the first inner wall 210 is greater than the radius of the second inner wall 220; one end of the first inner wall 210 is a through opening, and the other end is connected to one end of the second inner wall 220 through an annular first bottom surface 212; the other end of the second inner wall 220 is closed by the second bottom surface 222; the diffuser 230 is provided on the first bottom surface 212 and extends axially along the first inner wall 210.

[0054] In this technical solution, the lower portion of the rotor body 310 fits within the cavity formed by the second inner wall 220 and the second bottom surface 222. The lower portion of the rotor body 310 and the cavity form a regular columnar structure, which helps the rotor body 310 remain stably suspended within the rotor body 310's accommodating cavity and reduces the impact of blood flow on the position of the blood pump rotor 300. Blood enters the centrifugal blood pump through the liquid inlet 101. The blade assembly 320 generates centrifugal force on the blood, causing it to enter the diffuser 230 on the first inner wall 210, where it is pressurized. The blood then flows out through the liquid outlet 400 and enters the oxygenator connected to the centrifugal blood pump.

[0055] In one embodiment of the present invention, the blood pump housing 500 includes: an upper shell and a lower shell; the liquid inlet 101 is provided on the upper shell; the upper shell also has a blood output wall 103 and a transition portion connecting the liquid inlet 101 and the blood output wall 103; the blood output wall 103 and the first inner wall 210 located on the lower shell form the liquid outlet 400.

[0056] In this technical solution,

[0057] In one embodiment of the present invention, the outer radius of the blade assembly 320 is greater than the outer radius of the rotor body 310, enabling the centrifugal blood pump to generate greater centrifugal force at the same rotational speed, thereby outputting a higher pressure differential. Preferably, the outer radius of the blade assembly 320 is greater than the radius of the second inner wall 220, allowing the outer ends of the blades to extend into the area of ​​the first bottom surface 212. The extended blades are beneficial for enhancing the blade's work capacity.

[0058] In one embodiment of the present invention, Figure 2 As shown, the blade set 320 includes: main blades 321 and splitter blades 322; the main blades 321 are longer in radial direction than the splitter blades 322; the main blades 321 and the splitter blades 322 are arranged alternately.

[0059] In this technical solution, the blade group 320 with staggered lengths is used to improve the working capacity of the centrifugal blood pump rotor 300. At the same time, the shorter diverter blades 322 divert the blade flow channels formed between the main blades 321, which is beneficial to reducing the flow loss at the blade edge and the flow separation on the suction side of the blade, improving the efficiency of the centrifugal blood pump, and avoiding blood damage caused by the non-physiological shear force of the leading edge of the blade and blood congestion and thrombosis caused by flow separation on the suction side.

[0060] In one embodiment of the present invention, the diffuser 230 has a guide portion extending axially along the first inner wall 210 to form a guide portion; the multiple guide portions separate the liquid outlet 400 into multiple guide channels; the blade flow channels between adjacent main blades 321 and the guide channels constitute the blood output flow channel; further, the blood output wall 103 is adapted to the multiple guide portions; the multiple guide portions separate the blood output wall 103 and the first inner wall 210 into multiple guide channels, which can reduce the axial rotation of the blood when it flows out, so that the rotational component of the outflowing blood is smaller, thereby reducing the retention time of the blood in the liquid outlet 400 and avoiding the occurrence of thrombosis at the centrifugal blood pump outlet. At the same time, it can also reduce the collision between the centrifugal blood pump blood and the oxygenator, further reduce the non-physiological shear force at the centrifugal blood pump liquid outlet 400 (the blood inlet of the oxygenator) caused by the blood collision, and reduce the damage to red blood cells and the activation of platelets. Preferably, the diffuser 230 is integrally formed with the centrifugal blood pump housing 500.

[0061] In one embodiment of the present invention, Figure 3 、 Figure 4 and Figure 5 As shown, the diffuser channel formed between each two adjacent diffusers 230 is spiral-shaped; preferably, the diffuser channel curves in the same direction as the blood flow. The diffuser channel gradually widens from the center of the first bottom surface 212 toward the periphery. Blood flows from smaller cross-sections to larger cross-sections, increasing the pressure in the larger cross-sections. This reduces blood flow losses in the diffuser and improves the efficiency of the centrifugal blood pump.

[0062] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3As shown, the reflux holes 330 are provided between adjacent main blades 321. The radius of the circumference of the multiple reflux holes 330 is greater than the distance from the main blades 321 to the axis of the centrifugal blood pump rotor 300, and less than the distance from the diverter blades 322 to the axis of the centrifugal blood pump rotor 300. The rotor body 310 is adapted to the cavity formed by the second inner wall 220 and the second bottom surface 222. The gap between the rotor body 310, the second inner wall 220, and the second bottom surface 222 forms a blood reflux cavity. The rotor body 310 is suspended within the centrifugal blood pump housing 500 and generates relative motion with the centrifugal blood pump housing 500. A certain gap is required between the centrifugal blood pump rotor 300 and the housing. In the prior art, blood in this gap cannot participate in blood circulation well, easily forming a blood flow stagnation zone. The blood flow stagnation zone is subjected to high pressure, which is prone to thrombosis. In the present invention, multiple reflux holes 330, together with the gaps between the rotor body 310, the second inner wall 220, and the second bottom surface 222, form a blood reflux chamber, which together constitute a secondary channel for blood circulation. The centrifugal force of the blood on the periphery of the blades is greater than the centrifugal force of the blood on the periphery of the centrifugal blood pump rotor 300. The radius of the first inner wall 210 is greater than the radius of the second inner wall 220, which allows the blood between the outer end of the blade group 320 and the first bottom surface 212 to flow between the rotor body 310 and the second inner wall 220, and then flow back to the upper part of the centrifugal blood pump rotor 300 through the multiple reflux holes 330, and then participate in the blood output flow channel. The improvement in the secondary flow circulation efficiency can better flush the centrifugal blood pump rotor 300, further avoiding the formation of blood clots due to blood congestion in the rotor area. In addition, the design of the reflux holes 330 in the present invention can also reduce the pressure applied to the rotor by the secondary flow channel, thereby reducing the lift of the rotor and improving the dynamic balance of the rotor. During the actual operation of the centrifugal blood pump, the magnetic coupling system applies axial and radial balancing forces to the centrifugal blood pump rotor 300. This balancing force is precisely balanced with the hydraulic, axial and radial forces of the rotor, keeping the centrifugal blood pump rotor 300 suspended in the rotor accommodating cavity and able to rotate stably with the rotation of the magnetic driver; the return flow hole 330 provided by the present invention greatly reduces the axial lift of the rotor, so the required driving power consumption in the magnetic coupling drive device is smaller, and further blood damage caused by heating of the drive device is avoided.

[0063] In one embodiment of the present invention, the rotor body 310 includes a guide cone, the diameter of which gradually increases axially toward the end closest to the second bottom surface 222. The blade assembly 320 is arranged on the guide cone. In this technical solution, the guide cone gradually changes the direction of blood entering the centrifugal blood pump through the liquid inlet 101 from axial to radial, allowing blood to flow more smoothly into the blade flow passages and avoiding unstable flow in the impeller flow passages and resulting blood damage caused by sudden changes in flow direction.

[0064] The present invention provides a centrifugal blood pump, comprising: a blood pump rotor 300, comprising a rotor body 310 and a blade assembly 320 provided at one end of the rotor body 310; a blood pump housing 500, having a receiving cavity, wherein the blood pump rotor 300 is located; a return flow hole 330, which passes through both ends of the rotor body 310 in the axial direction; a gap between the rotor body 310 and the blood pump housing 500, wherein the return flow hole 330 is connected to the gap to form a secondary flow path for blood; and a plurality of diffusers 230. It is arranged on the inner wall surface of the blood pump housing 500; a diffusion channel is formed between adjacent diffusion parts 230, and the diffusion channel gradually widens from the center to the periphery of the blood pump housing 500; the liquid inlet 101 is arranged at one end of the blood pump housing 500; the liquid outlet 400 is arranged on the periphery of the liquid inlet 101, and the liquid outlet 400 and the liquid inlet 101 are both located at the same end of the blood pump housing 500; blood enters from the liquid inlet 101, passes through the diffusion channel and the secondary channel, and flows out from the liquid outlet 400. The centrifugal blood pump provided by the present invention, on the one hand, can make the centrifugal blood pump directly connected to the oxygenator, and can make blood enter the oxygenator evenly from all directions, avoiding power loss. On the other hand, it reduces blood damage caused by repeated stirring of the blades due to blood circulation. At the same time, it also improves the low-speed secondary flow in the centrifugal blood pump, improves the efficiency of the centrifugal blood pump, and reduces the risk of blood damage and blood congestion.

[0065] In one embodiment of the present invention, the centrifugal blood pump further includes a liquid inlet tube 101; one end of the liquid inlet tube 102 is connected to the liquid inlet port 101, and the other end passes through the center of the oxygenator; or, one end of the liquid inlet tube 102 is connected to the liquid inlet port 101, and the other end of the liquid inlet tube 102 passes through the diffuser, and the liquid inlet tube 102 protrudes from the outer periphery of the blood pump housing 500.

[0066] There are two implementation methods for connecting the liquid inlet 101 of the centrifugal blood pump via the liquid inlet pipe 102. One implementation method is as follows: Figure 1 As shown, in this connection method, the liquid inlet 101 of the centrifugal blood pump and the blood outlet of the oxygenator are located on the same side, and the liquid inlet 101 of the blood pump is located at the axial center of the oxygenator, and the blood inlet of the oxygenator is arranged in a ring shape along the oxygenator shell; the liquid inlet pipe 102 of the centrifugal blood pump is a straight pipe, which is used to pass through the center position of the oxygenator; the liquid outlet 400 is directly adapted to the annular blood inlet of the oxygenator, and is connected to the ECMO cannula by opening a through hole on the oxygenator. The use of a straight pipe can greatly reduce the flow separation in the liquid inlet pipe 102, but it will also destroy the original structure of the oxygenator. Another embodiment is as follows Figure 6As shown, the centrifugal blood pump's inlet pipe 102 protrudes from the outer periphery of the blood pump housing; preferably, the inlet pipe 102 is elbow-shaped and is connected to the ECMO cannula through the through-hole opened on the diffuser 230 and the blood pump housing 500. Due to the elbow shape of the inlet pipe 102, flow separation is likely to occur in the corner area, thereby inducing thrombosis. However, this method can avoid affecting the oxygenator structure. Figure 1 and Figure 6 The direction of the arrow indicates the direction of blood flow.

[0067] It should be understood that the above-mentioned specific embodiments of the present application are merely illustrative or explain the principles of the present application and do not constitute a limitation of the present application. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present application should be included in the scope of protection of the present application. In addition, the claims attached hereto are intended to cover all variations and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A centrifugal blood pump, characterized in that: include: A blood pump rotor (300) comprises a rotor body (310) and a blade assembly (320) arranged at one end of the rotor body (310); A blood pump housing (500) having an accommodating cavity, wherein the blood pump rotor (300) is located in the accommodating cavity; A return flow hole (330) passes through both ends of the rotor body (310) in the axial direction; A gap is provided between the rotor body (310) and the blood pump housing (500), and the reflux hole (330) is connected to the gap to form a secondary flow channel for blood; A plurality of pressure diffusers (230) are arranged on the inner wall surface of the blood pump housing (500); A pressure diffusion channel is formed between adjacent pressure diffusion portions (230), and the pressure diffusion channel gradually widens from the center to the periphery of the blood pump housing (500); A liquid inlet (101) is provided at one end of the blood pump housing (500); a liquid outlet (400) disposed on the periphery of the liquid inlet (101), and the liquid outlet (400) and the liquid inlet (101) are both located at the same end of the blood pump housing (500); The liquid inlet (101) is in communication with the pressure diffuser flow channel and the secondary flow channel, and the pressure diffuser flow channel is in communication with the liquid outlet (400); The outer radius of the blade assembly (320) is greater than the outer radius of the rotor body (310); The diffuser flow channel formed between each two adjacent diffusers (230) is spiral-shaped.

2. The centrifugal blood pump according to claim 1, characterized in that The inner wall surface of the blood pump housing (500) includes a first inner wall (210) and a second inner wall (220) that are coaxial; The radius of the first inner wall (210) is greater than the radius of the second inner wall (220); One end of the first inner wall (210) is a through opening, and the other end is connected to one end of the second inner wall (220) through a first annular bottom surface; The other end of the second inner wall (220) is closed by a second bottom surface (222); The diffuser (230) is provided on the first bottom surface (212) and extends axially along the first inner wall (210).

3. The centrifugal blood pump according to claim 2, characterized in that The blood pump housing (500) comprises: an upper housing and a lower housing; A liquid inlet (101) is provided on the upper shell; The upper housing further comprises a blood output wall (103) and a transition portion connecting the liquid inlet (101) and the blood output wall (103); The blood output wall (103) and the first inner wall (210) located on the lower shell form the liquid outlet (400).

4. The centrifugal blood pump according to claim 2, characterized in that The blade assembly (320) includes: a main blade (321) and a splitter blade (322); The main blade (321) has a greater radial length than the splitter blade (322); The main blades (321) and the splitter blades (322) are arranged alternately.

5. The centrifugal blood pump according to claim 4, characterized in that The diffuser (230) has a flow guide portion extending axially along the first inner wall (210); The plurality of guide portions separate the liquid outlet (400) into a plurality of guide channels; The blade flow channels between adjacent main blades (321) and the guide channel constitute a blood output flow channel.

6. The centrifugal blood pump according to claim 4, characterized in that The reflux hole (330) is provided between adjacent main blades (321); The circumferential radius of the return flow hole (330) is greater than the distance from the main blade (321) to the axis of the blood pump rotor (300), and smaller than the distance from the splitter blade (322) to the axis of the blood pump rotor (300).

7. The centrifugal blood pump according to claim 2, characterized in that The rotor body (310) is provided with a guide cone, the diameter of which gradually increases along the axial direction toward one end close to the second bottom surface (222), and the blade group (320) is arranged on the guide cone.

8. The centrifugal blood pump according to claim 1, characterized in that Also includes a liquid inlet pipe (102); One end of the liquid inlet pipe (102) is connected to the liquid inlet (101), and the other end passes through the center of the oxygenator; or, One end of the liquid inlet tube (102) is connected to the liquid inlet (101), the other end of the liquid inlet tube (102) passes through the diffuser (230), and the liquid inlet tube (102) protrudes from the outer periphery of the blood pump housing (500).

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