Blood pump head and blood pump

Abstract

The utility model provides a blood pump head and a blood pump, the blood pump head comprises a pump shell and a rotor, and a spiral flow channel is formed in the pump shell; therefore, vortex of blood in the spiral flow channel can be reduced, the flowing property of the blood is improved, and damage to blood cells is reduced; the distance between the outer edge of the starting point of the spiral flow channel and the rotating axis of the rotor is 1.1-1.25 times of the distance between the outer edge of the blade and the rotating axis of the rotor; thus, the distance between the starting point of the spiral flow channel and the outer edge of the blade is increased, the shearing force of the starting point of the spiral flow channel to blood can be effectively reduced, and damage to blood cells is reduced.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a blood pump head and a blood pump. Background Technology

[0002] In magnetically levitated blood pumps, the rotor rotates and levitates under the drive of a motor. However, the rotation of the rotor often generates high shear forces as the fluid flows through it. For biologically active fluids like blood, excessive shear forces can damage the cellular components. Therefore, effectively reducing shear forces and protecting blood cells from damage has become a pressing problem. Utility Model Content

[0003] To address the aforementioned technical problems, this application provides a blood pump head and a blood pump.

[0004] A first aspect of this application provides a blood pump head, including a pump housing and a rotor;

[0005] The rotor is disposed within the pump casing; the rotor includes a rotor body and blades; the blades are disposed on the end face of the rotor body;

[0006] A spiral flow channel is formed inside the pump casing; the distance between the outer edge of the starting point of the spiral flow channel and the rotation axis of the rotor is 1.1 to 1.25 times the distance between the outer edge of the blade and the rotation axis of the rotor.

[0007] In some embodiments of this application, the blade includes a first blade and a second blade; the first blade and the second blade are evenly distributed at intervals along the rotation axis on the end face of the rotor body; the distance between the outer edge of the first blade and the rotation axis is equal to the distance between the outer edge of the second blade and the rotation axis.

[0008] In some embodiments of this application, the first blade includes an integrally formed first part and a second part; the first part is disposed on the end face of the rotor body; the second part extends to the outside of the rotor body; the end of the first part away from the rotor body has a first inclined surface; the angle between the first inclined surface and the end face of the rotor body is a first angle; the first angle is 15° to 25°; the end of the second part near the rotor body has a second inclined surface; the angle between the second inclined surface and the end face of the rotor body is a second angle; the second angle is 5° to 10°.

[0009] In some embodiments of this application, the second blade includes an integrally formed third portion and a fourth portion; the third portion is disposed on the end face of the rotor body; the fourth portion extends to the outer side of the rotor body; the end of the third portion away from the rotor body has a third inclined surface; the angle between the third inclined surface and the end face of the rotor body is a third angle; the third angle is 15° to 25°; the end of the fourth portion near the rotor body has a fourth inclined surface; the angle between the fourth inclined surface and the end face of the rotor body is a fourth angle; the fourth angle is 5° to 10°.

[0010] In some embodiments of this application, the first included angle is equal to the third included angle; the second included angle is equal to the fourth included angle.

[0011] In some embodiments of this application, the pump housing includes a first pump housing and a second pump housing that are sealed together; the first pump housing is provided with a blood inlet; the first pump housing includes a conical section connecting to the blood inlet, a horizontal section connecting to the conical section, and an arc-shaped section connecting to the horizontal section; when the rotor is statically suspended, the distance between the side of the second part and the fourth part near the first pump housing and the inner wall of the horizontal section is 3mm to 5mm.

[0012] In some embodiments of this application, the angle between the tangent at the outer normal circle of the outer edge vertex of the second part and the extension of the second part is a fifth angle; the fifth angle is 60° to 75°.

[0013] In some embodiments of this application, the angle between the tangent at the outer normal circle of the outer edge vertex of the fourth part and the extension of the fourth part is the sixth angle; the sixth angle is 55° to 70°.

[0014] In some embodiments of this application, the third part forms a second blade inlet near the axis of rotation; the diameter of the second blade inlet is 0.6 to 0.7 times the outer circumferential diameter of the rotor body.

[0015] In some embodiments of this application, the second pump housing includes a second pump housing body and a mounting portion disposed on the circumferential surface of the second pump housing body; the mounting portion has a snap-fit ​​portion protruding from the mounting portion along the rotation axis direction.

[0016] In some embodiments of this application, a blood outlet is provided on the side of the second pump housing; a support portion is provided on the side of the blood outlet away from the first pump housing.

[0017] A second aspect of this application provides a blood pump, including the aforementioned blood pump head.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: The blood pump head of the present application includes a pump housing and a rotor, and a spiral flow channel is formed inside the pump housing; thus, the eddy current of blood in the spiral flow channel can be reduced, the flow performance of blood can be improved, and the damage to blood cells can be reduced; the distance between the outer edge of the starting point of the spiral flow channel and the rotation axis of the rotor is 1.1 to 1.25 times the distance between the outer edge of the blade and the rotation axis of the rotor; thus, the distance between the starting point of the spiral flow channel and the outer edge of the blade is increased, which can effectively reduce the shear force on the blood at the starting point of the spiral flow channel and reduce the damage to blood cells.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0020] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a top view of a blood pump head (with the first pump housing hidden) provided in an exemplary embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the structure of a blood pump head provided in an exemplary embodiment of this application;

[0023] Figure 3 This is a cross-sectional view of a blood pump head provided in an exemplary embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the rotor structure provided in an exemplary embodiment of this application;

[0025] Figure 5 This is a front view of the rotor provided in an exemplary embodiment of this application;

[0026] Figure 6 This is a top view of a rotor provided in an exemplary embodiment of this application;

[0027] Figure 7 This is a front view of a blood pump head provided in an exemplary embodiment of this application;

[0028] Figure 8 This is a bottom view of a blood pump head provided in an exemplary embodiment of this application.

[0029] In the picture:

[0030] 10. Pump casing; 11. First pump casing; 111. First partition; 12. Second pump casing; 121. Second partition; 122. Second pump casing body; 123. Mounting part; 124. Snap-fit ​​part; 13. Blood inlet; 14. Blood outlet; 15. Spiral flow channel; 16. Support part; 20. Rotor; 21. Blade; 211. First blade; 2111. First part; 2112. Second part; 212. Second blade; 2121. Third part; 2122. Fourth part; 22. Rotor body; A1. First included angle; A2. Second included angle; A3. Third included angle; A4. Fourth included angle; A5. Fifth included angle; A6. Sixth included angle. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0032] In magnetically levitated blood pumps, the rotor rotates and levitates under the drive of a motor. However, the rotation of the rotor often generates high shear forces as the fluid flows through it. For biologically active fluids like blood, excessive shear forces can damage the cellular components. Therefore, effectively reducing shear forces and protecting blood cells from damage has become a pressing problem.

[0033] Based on this, an exemplary embodiment of this application provides a blood pump head, which includes a pump housing and a rotor, with a spiral flow channel formed inside the pump housing. This reduces blood eddies within the spiral flow channel, improves blood flow performance, and reduces damage to blood cells. The distance between the outer edge of the spiral flow channel's starting point and the rotor's rotation axis is 1.1 to 1.25 times the distance between the outer edge of the blade and the rotor's rotation axis. This increases the distance between the spiral flow channel's starting point and the blade's outer edge, effectively reducing the shear force on the blood at the spiral flow channel's starting point and minimizing damage to blood cells.

[0034] Example 1:

[0035] An exemplary embodiment of this application provides a blood pump head, such as... Figures 1 to 3As shown, the pump head includes a pump housing 10 and a rotor 20; the pump housing 10 includes a first pump housing 11 and a second pump housing 12, which are sealed together; a blood inlet 13 is provided on the first pump housing 11; a blood outlet 14 is provided on the side of the second pump housing 12. A first spiral flow channel is formed inside the first pump housing 11, and a second spiral flow channel is formed inside the second pump housing 12. The first and second spiral flow channels together form a spiral flow channel 15 inside the pump housing 10. The spiral flow channel 15 can improve the flow of fluid, reduce eddies inside the pump housing 10, improve the performance of the blood pump, and thus reduce the speed of the blood pump and reduce damage to the blood; the diameter of the spiral flow channel 15 increases spirally from the starting point to the blood outlet 14, which can adapt to the continuously increasing flow rate and reduce shear force. Figure 1 and 3 As shown, a first partition 111 and a second partition 121 are formed at the connection between the blood outlet 14 and the spiral flow channel 15. The first partition 111 is located on the first pump housing 11, and the second partition 121 is located on the second pump housing 12. The first partition 111 and the second partition 121 together restrict the backflow of blood, thereby reducing the amount of blood backflow. The first partition 111 and the second partition 121 are the starting points of the spiral flow channel 15. The rotor 20 is disposed inside the pump housing 10; the rotor 20 includes a rotor body 22 and blades 21; the blades 21 are disposed on the end face of the rotor body 22; under the action of electromagnetic force, the rotor 20 can rotate and suspend inside the pump housing 10. When the rotor 20 rotates, it can drive blood to flow in from the blood inlet 13 and out from the blood outlet 14.

[0036] Since blood is pumped out from blood outlet 14, the flow rate of the fluid pumped by rotor 20 at the flow channel initiation point is zero. In the prior art, to prevent blood backflow or reduce blood backflow, the distance between the flow channel initiation point and the outer edge of blade 21 in some blood pump heads is very close. However, this arrangement can lead to excessive shearing force, causing excessive damage to blood cells. In this application, the distance between the outer edge of the spiral flow channel initiation point and the rotation axis of rotor 20 is... Figure 1 As shown, half of D1, the distance between the outer edge of blade 21 and the rotation axis of rotor 20 is half of D2, and the distance between the outer edge of the starting point of helical flow channel 15 and the rotation axis of rotor 20 is 1.1 to 1.25 times the distance between the outer edge of blade 21 and the rotation axis of rotor 20; preferably, as Figure 1As shown, the distance between the outer edge of the starting point of the spiral flow channel 15 and the rotation axis of the rotor 20 is 1.22 times the distance between the outer edge of the blade 21 and the rotation axis of the rotor 20. This maintains a large gap between the starting point of the spiral flow channel 15 and the outer edge of the rotor 20, increases the distance between the starting point of the spiral flow channel 15 and the outer edge of the blade 21, reduces the interference between the blade 21 and the starting point of the spiral flow channel 15, effectively reduces the shear force of the spiral flow channel 15 on the blood, and reduces damage to blood cells. At the same time, the first partition 111 and the second partition 121 jointly restrict blood backflow and improve pump performance.

[0037] For example, such as Figure 4 As shown, the blade 21 includes a first blade 211 and a second blade 212; the first blade 211 and the second blade 212 are evenly distributed at intervals along the rotation axis on the end face of the rotor body 22; preferably, the end face of the rotor body 22 is a plane, the first blade 211 is the main blade, and the second blade 212 is a flow divider blade. The distance between the outer edge of the first blade 211 and the rotation axis is equal to the distance between the outer edge of the second blade 212 and the rotation axis, which can improve the pump performance and reduce damage to the blood. It should be noted that all distances mentioned in this application refer to vertical distances.

[0038] like Figure 4 and 5 As shown, the first blade 211 includes an integrally formed first part 2111 and a second part 2112; the first part 2111 is disposed on the end face of the rotor body 22; the second part 2112 extends to the outside of the rotor body 22; the end of the first part 2111 away from the rotor body 22 has a first inclined surface; the angle between the first inclined surface and the end face of the rotor body 22 is a first angle A1, that is, the inlet inclination angle of the first blade 211; preferably, the first angle A1 is 15° to 25°, such as... Figure 5 As shown, the first included angle A1 is 18°; the second part 2112 has a second inclined surface at one end near the rotor body 22, and the second inclined surface is connected to the end face of the rotor body 22 with a rounded corner; the included angle between the second inclined surface and the end face of the rotor body 22 is the second included angle A2, which is the outlet inclined angle of the first blade 211; preferably, the second included angle A2 is 5° to 10°, such as... Figure 5 As shown, the second included angle A2 is 9°; the end of the second part 2112 that is away from the end face of the rotor body 22 is parallel to the end face of the rotor body 22.

[0039] The second blade 212 includes an integrally formed third part 2121 and a fourth part 2122; the third part 2121 is disposed on the end face of the rotor body 22; the fourth part 2122 extends to the outside of the rotor body 22; the end of the third part 2121 away from the rotor body 22 has a third inclined surface; the angle between the third inclined surface and the end face of the rotor body 22 is a third angle A3, which is the inlet inclination angle of the second blade 212; the third angle A3 is 15° to 25°, such as... Figure 5 As shown, the third included angle A3 is 18°; the fourth part 2122 has a fourth inclined surface at one end near the rotor body 22, and the fourth inclined surface is connected to the end face of the rotor body 22 with a rounded corner; the included angle between the fourth inclined surface and the end face of the rotor body 22 is the fourth included angle A4, which is the outlet inclined angle of the second blade 212; the fourth included angle A4 is 5° to 10°, as shown. Figure 5 As shown, the fourth included angle A4 is 9°; the end of the fourth part 2122 that is away from the end face of the rotor body 22 is parallel to the end face of the rotor body 22. Preferably, the first included angle A1 is equal to the third included angle A3; the second included angle A2 is equal to the fourth included angle A4, so that each blade 21 has the same inlet tilt angle and outlet tilt angle, making the velocity gradient distribution in the flow channel uniform, reducing eddies, and reducing shear force.

[0040] During the pumping of blood, losses occur within the rotor 20 due to secondary flow and frictional heat. The secondary flow causes secondary damage to the blood, while frictional heat increases shear force. The secondary flow primarily occurs within the flow channels of the blades 21. Figure 6 As shown, the angle between the tangent at the outer normal circle of the outer edge vertex of the second part 2112 and the extension of the second part 2112 is the fifth included angle A5; preferably, the fifth included angle A5 is 60° to 75°, such as... Figure 6 As shown, the fifth included angle A5 is 70°. The angle between the tangent line at the outer normal circle of the outer edge vertex of the fourth part 2122 and the extension line of the fourth part 2122 is the sixth included angle A6; preferably, the sixth included angle A6 is 55° to 70°, such as... Figure 6 As shown, the sixth included angle A6 is 65°; thus, the transition between the edges of the first blade 211 and the second blade 212 and the spiral flow channel 15 is smoother, which can avoid flow separation at the outlet of blade 21, reduce secondary flow in the flow channels of the first blade 211 and the second blade 212, and reduce secondary damage to the blood.

[0041] Frictional heat generation mainly occurs at the inlet of blade 21. In this application, the inlet of the second blade 212 is formed near the axis of rotation of the third part 2121; the diameter D4 of the inlet of the second blade 212 is 0.6 to 0.7 times the diameter D3 of the outer circumferential surface of the rotor body 22, preferably, as shown below. Figure 6As shown, the diameter D4 of the inlet of the second blade 212 is 0.625 times the diameter D3 of the outer circumference of the rotor body 22; this reduces the friction at the inlet of the second blade 212, avoids increased shear force due to frictional heat, reduces damage to the blood, and thus improves the pump performance.

[0042] When rotor 20 floats, the distance between the upper edge of rotor 20 and the inner wall of pump casing 10 changes with the rotational speed of rotor 20. The higher the rotational speed, the smaller the distance between the upper edge of rotor 20 and the inner wall of pump casing 10. In this application, as... Figure 3 As shown, the first pump housing 11 includes a conical section connecting to the blood inlet 13, a horizontal section connecting to the conical section, and an arc-shaped section connecting to the horizontal section. When the rotor 20 is statically suspended, the distance between the side of the second part 2112 and the fourth part 2122 near the first pump housing 11 and the inner wall of the horizontal section is 3mm to 5mm. This makes the distance between the upper edge of the rotor 20 and the inner wall of the pump housing 10 larger, so that the upper edge of the rotor 20 and the inner wall of the pump housing 10 maintain a large distance in the high speed range of the blood pump, which can reduce damage to the blood.

[0043] For example, to facilitate the installation of the blood pump head, such as Figure 7 and 8 As shown, the second pump housing 12 includes a second pump housing body 122 and a mounting portion 123 disposed on the circumferential surface of the second pump housing body 122; a snap-fit ​​portion 124 protruding from the mounting portion 123 along the rotation axis is formed on the mounting portion 123. Preferably, the snap-fit ​​portion 124 has an inclined surface that connects to the upper surface of the mounting portion 123, and the motor body is provided with a snap-fit ​​groove that cooperates with the snap-fit ​​portion 124. When the blood pump head is installed on the motor body, it is rotated at a certain angle so that the snap-fit ​​portion 124 is snapped into the snap-fit ​​groove, so that the inclined surface of the snap-fit ​​portion 124 can be tightly fitted with the snap-fit ​​groove to prevent the blood pump head from rotating during operation.

[0044] Preferably, as shown in Question 8, a support portion 16 is provided on the side of the blood outlet 14 away from the first pump housing 11. The support portion 16 can abut against the motor body, so that the blood pump head is stably mounted on the motor body.

[0045] Example 2:

[0046] An exemplary embodiment of this application provides a blood pump, including a blood pump head as described in Embodiment 1 and a motor body, wherein the motor body is capable of generating electromagnetic force to drive the rotor 20 to rotate and levitate.

[0047] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0048] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0049] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A blood pump head, characterized in that, Including the pump casing and rotor; The rotor is disposed within the pump casing; the rotor includes a rotor body and blades; the blades are disposed on the end face of the rotor body; A spiral flow channel is formed inside the pump casing; the distance between the outer edge of the starting point of the spiral flow channel and the rotation axis of the rotor is 1.1 to 1.25 times the distance between the outer edge of the blade and the rotation axis of the rotor.

2. The blood pump head according to claim 1, characterized in that, The blade includes a first blade and a second blade; the first blade and the second blade are evenly distributed at intervals along the rotation axis on the end face of the rotor body; the distance between the outer edge of the first blade and the rotation axis is equal to the distance between the outer edge of the second blade and the rotation axis.

3. The blood pump head according to claim 2, characterized in that, The first blade includes an integrally formed first part and a second part; the first part is disposed on the end face of the rotor body; the second part extends to the outside of the rotor body; the end of the first part away from the rotor body has a first inclined surface; the angle between the first inclined surface and the end face of the rotor body is a first angle; the first angle is 15° to 25°; the end of the second part near the rotor body has a second inclined surface; the angle between the second inclined surface and the end face of the rotor body is a second angle; the second angle is 5° to 10°.

4. The blood pump head according to claim 3, characterized in that, The second blade includes an integrally formed third part and a fourth part; the third part is disposed on the end face of the rotor body; the fourth part extends to the outside of the rotor body; the end of the third part away from the rotor body has a third inclined surface; the angle between the third inclined surface and the end face of the rotor body is a third angle; the third angle is 15° to 25°; the end of the fourth part near the rotor body has a fourth inclined surface; the angle between the fourth inclined surface and the end face of the rotor body is a fourth angle; the fourth angle is 5° to 10°.

5. The blood pump head according to claim 4, characterized in that, The first included angle is equal to the third included angle; the second included angle is equal to the fourth included angle.

6. The blood pump head according to claim 4, characterized in that, The pump housing includes a first pump housing and a second pump housing that are sealed together; the first pump housing is provided with a blood inlet; the first pump housing includes a conical section connecting to the blood inlet, a horizontal section connecting to the conical section, and an arc-shaped section connecting to the horizontal section; when the rotor is statically suspended, the distance between the side of the second part and the fourth part near the first pump housing and the inner wall of the horizontal section is 3mm to 5mm.

7. The blood pump head according to claim 4, characterized in that, The angle between the tangent at the outer normal circle of the outer edge vertex of the second part and the extension of the second part is the fifth angle; the fifth angle is 60° to 75°.

8. The blood pump head according to claim 4, characterized in that, The angle between the tangent at the outer normal circle of the outer edge vertex of the fourth part and the extension of the fourth part is the sixth included angle; the sixth included angle is 55° to 70°.

9. The blood pump head according to claim 4, characterized in that, The third part forms a second blade inlet near the axis of rotation; the diameter of the second blade inlet is 0.6 to 0.7 times the outer circumferential diameter of the rotor body.

10. The blood pump head according to claim 6, characterized in that, The second pump housing includes a second pump housing body and a mounting portion disposed on the circumferential surface of the second pump housing body; the mounting portion has a snap-fit ​​portion protruding from the mounting portion along the rotation axis direction.

11. The blood pump head according to claim 6, characterized in that, The second pump housing has a blood outlet on its side; a support portion is provided on the side of the blood outlet away from the first pump housing.

12. A blood pump, characterized in that, Includes the blood pump head as described in any one of claims 1 to 11.

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