An implantable nutating blood pump supported by a bearing
By introducing a bearing support structure into the miniature mechanical nutation blood pump, the problem of high-speed wear was solved, the service life was extended, debris contamination was reduced, and higher blood compatibility was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FUZHOU UNIV
- Filing Date
- 2026-05-27
- Publication Date
- 2026-07-14
Smart Images
Figure CN122376995A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an implantable endovascular blood pump supported by a bearing. Background Technology
[0002] Heart failure is a severe and end-stage stage of various heart diseases and one of the most important cardiovascular diseases of the 21st century. Its incidence increases with age and is a leading cause of hospitalization for patients over 65 in Western countries. With the aging population, the incidence and prevalence of heart failure in my country will increase significantly. For patients with mild heart failure, medication is the primary treatment, while the most effective treatment for severe heart failure is heart transplantation. However, heart transplantation faces two major challenges: a severe shortage of heart donors and the difficulty in resolving post-transplant immune rejection, which severely impacts transplant survival rates. Artificial blood pumps utilize mechanical movement to propel blood circulation, partially or completely replacing the heart's pumping function. Therefore, research into artificial blood pumps has become one of the most effective treatments for heart failure, helping to alleviate global healthcare needs, in order to replace expensive drug treatments and organ transplantation.
[0003] From a structural perspective, most artificial blood pumps currently designed are centrifugal or axial flow pumps. Centrifugal pumps have lower rotational speeds but are larger in size, which is detrimental to implantation, especially for pediatric patients. Axial flow pumps are small and efficient, but their rotor speeds are generally very high, generating significant shear stress and potentially damaging blood cells. Therefore, miniaturization and low-speed design of blood pumps have always been among the challenges in structural innovation, and are a bottleneck restricting artificial heart transplantation and blood compatibility. Miniature mechanical nutation blood pumps are characterized by their small size, low speed, and high flow rate. However, the rotor in the pump body experiences wear at contact points during high-speed operation, which reduces the lifespan of the blood pump over time. Furthermore, the debris generated by this wear can contaminate the blood. Therefore, to address these issues, a corresponding structure for the miniature mechanical nutation blood pump has been designed, resulting in a miniature mechanical nutation blood pump with reduced wear. Summary of the Invention
[0004] The present invention addresses the problems existing in the prior art. Specifically, the technical problem to be solved by the present invention is to provide an implantable nutation blood pump with bearing support, which is reasonably designed to improve the service life of the blood pump and avoid the contamination of blood by debris generated by wear.
[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an implantable nutating blood pump supported by a bearing, comprising a pump body with an internal pump chamber and a nutating disc disposed within the pump chamber. The peripheral sidewall of the pump chamber is provided with an inlet and an outlet. An anti-rotation baffle is radially disposed between the inlet and the outlet inside the pump chamber. The nutating disc comprises a circular planar disc body. A spherical pair is disposed through the center of the circular planar disc body. An eccentric drive sleeve for connecting to the output shaft of a motor is disposed in the inner hole of the spherical pair. A first bearing for contacting the inner hole of the spherical pair is sleeved on the outer side of the eccentric drive sleeve. A rectangular notch extending radially is provided on the circular planar disc body to facilitate the insertion of the anti-rotation baffle. A cylindrical pin fixed to the outer spherical surface of the spherical pair is disposed in the rectangular notch. A second bearing is sleeved on the outer side of the cylindrical pin. An arc-shaped groove is provided on the inner end of the anti-rotation baffle to facilitate the insertion of the cylindrical pin. The second bearing and the arc-shaped groove form a rolling fit.
[0006] Furthermore, the eccentric drive sleeve is fitted on the outside of the vertically positioned motor output shaft, and the axis of the eccentric drive sleeve is inclined to the axis of the motor output shaft.
[0007] Furthermore, there are two first bearings, which are respectively sleeved on the outer sides of the upper and lower ends of the eccentric drive sleeve.
[0008] Furthermore, the outer peripheral side of the eccentric drive sleeve has an annular flange in the middle; the inner hole of the spherical pair is a stepped through hole, and a retaining ring groove is provided on the upper peripheral side of the inner hole of the spherical pair; the first bearing located at the lower end is provided with an annular flange between the inner hole of the spherical pair and the stepped surface located at the lower end; the first bearing located at the upper end is provided on the upper side of the annular flange, and a retaining ring for limiting the first bearing located at the upper end is provided in the retaining ring groove.
[0009] Furthermore, both the first and second bearings are deep groove ball bearings.
[0010] Furthermore, the inner end of the anti-rotation baffle is provided with a spherical adaptation part for matching the outer spherical surface of the spherical pair, and the arc-shaped groove is coaxially provided on the side of the spherical adaptation part facing the spherical pair.
[0011] Furthermore, the pump body includes a pump casing, an upper pump cover and a lower pump cover respectively disposed at the upper and lower ends of the pump casing, the pump casing, the upper pump cover and the lower pump cover together form a pump cavity, the inner circumferential side of the pump casing is a spherical surface that matches the movement trajectory of the nutation disc edge; the suction port and the discharge port are both disposed on the spherical surface; the upper pump cover has a stepped hole in the middle to facilitate the passage of the motor output shaft.
[0012] Furthermore, the outer peripheral side of the pump casing is provided with a pair of cylindrical through holes, which are respectively connected to the suction port and the discharge port.
[0013] Furthermore, the outer end of the anti-rotation baffle is embedded in the spherical surface, and the anti-rotation baffle is interference-fitted with the pump casing; the lower surface of the upper pump cover and the upper surface of the lower pump cover are both provided with positioning grooves for installing the anti-rotation baffle.
[0014] Furthermore, the lower surface of the upper pump cover is a conical surface, and a first ball socket for engaging with the upper end of the spherical pair is provided in the middle of the conical surface; the upper surface of the upper pump cover is a conical surface, and a second ball socket for engaging with the lower end of the spherical pair is provided in the middle of the conical surface.
[0015] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed and incorporates bearings at the locations where the blood pump rotor will wear down during high-speed operation, which can greatly reduce the corresponding wear, thereby improving the service life of the blood pump and preventing the contamination of blood by wear debris. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 This is a side cross-sectional view of an embodiment of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of an embodiment of the present invention; Figure 4 This is an exploded view diagram of an embodiment of the present invention (driving motor omitted). Figure 5 This is a three-dimensional structural diagram of the pump body in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the pump body after the pump cover is hidden in an embodiment of the present invention; Figure 7 This is a schematic diagram of the fit between the eccentric drive sleeve and the first bearing in an embodiment of the present invention; Figure 8 This is a schematic diagram showing the disassembled state of the eccentric drive sleeve and the first bearing in an embodiment of the present invention; Figure 9 This is a schematic diagram of the cross-sectional structure of the eccentric drive sleeve in an embodiment of the present invention; Figure 10 This is a three-dimensional structural diagram of the upper pump cover in an embodiment of the present invention; Figure 11 This is a three-dimensional structural diagram of the nutation disk in an embodiment of the present invention.
[0017] Figure 12 This is a schematic diagram of implantation according to an embodiment of the present invention.
[0018] In the picture: 1-Pump body; 2-Nutrition disc; 3-Drive motor; 4-Motor output shaft; 5-Suction port; 6-Discharge port; 7-Anti-rotation baffle; 8-Circular flat disc; 9-Spherical pair; 10-Inner hole of spherical pair; 11-Eccentric drive sleeve; 12-Rectangular notch; 13-Cylindrical pin; 14-First bearing; 15-Second bearing; 16-Arc-shaped groove; 17-Inner hole of eccentric drive sleeve; 18-Annular flange; 19-Snap ring groove; 20-Snap ring; 21-Spherical adapter; 22-Pump housing; 23-Upper pump cover; 24-Lower pump cover; 25-Spherical surface; 26-Cylindrical through hole; 27-Positioning groove; 28-First ball socket; 29-Second ball socket; 30-Artificial blood vessel; 31-Suture ring; 32-Nutrition blood pump; 33-Stepped hole; 34-Pump chamber. Detailed Implementation
[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0020] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0021] like Figures 1-11As shown, this invention discloses an implantable nutating blood pump supported by bearings, comprising a pump body 1 with an internal pump chamber 34, a nutating disc 2 disposed within the pump chamber, and a drive motor 3 disposed on the top of the pump body 1. The output shaft 4 of the drive motor 3 passes through the top of the pump body 1 and extends into the pump chamber, connecting to the nutating disc 2. The peripheral wall of the pump chamber is provided with an inlet 5 and an outlet 6. An anti-rotation baffle 7 is radially disposed between the inlet 5 and the outlet 6 inside the pump chamber. The nutating disc 2 serves as the blood pump rotor and includes a circular flat disc 8. A spherical joint 9 is fixedly disposed through the center of the circular flat disc 8. The spherical joint forms a spherical hinge structure for the pump body. The inner hole of the spherical joint 9 is provided for connecting with the motor output shaft 3. An eccentric drive sleeve 11 is connected to the output shaft 4. A first bearing 14 is fitted on the outer side of the eccentric drive sleeve 11 to contact the inner hole 10 of the spherical pair. The motor output shaft 4 drives the nutation disk 2 to nutate within the pump chamber via the eccentric drive sleeve 11 and the first bearing 14. A rectangular notch 12 extending radially on the circular flat disk 8 facilitates the insertion of an anti-rotation baffle 7. A cylindrical pin 13 fixed to the outer spherical surface of the spherical pair 9 is located within the rectangular notch 12. A second bearing 15 is fitted on the outer side of the cylindrical pin 13. An arc-shaped groove 16 is provided on the inner end of the anti-rotation baffle 7 to facilitate the insertion of the cylindrical pin 13. The second bearing 15 and the arc-shaped groove 16 form a rolling fit. Due to the circumferential limiting effect of the radially arranged anti-rotation baffle, the possibility of the nutation disk rotating with the motor output shaft is blocked. Therefore, under the forced actuation of the eccentric drive sleeve, the nutation disk can only make periodic, non-rotating pure nutation oscillations. When the nutation disk makes nutation oscillations, the cylindrical pin slides in the arc-shaped groove.
[0022] The areas between the cylindrical pin 13 and the arc-shaped groove 16, and between the eccentric drive sleeve 11 and the inner hole of the spherical pair 9 of the nutation disk 3, are where the blood pump rotor (i.e., the nutation disk) will experience wear during high-speed operation. This invention incorporates bearings (i.e., a first bearing is fitted on the outer side of the eccentric drive sleeve, and a second bearing is fitted on the outer side of the cylindrical pin) at these locations where the blood pump rotor will experience wear during high-speed operation. This significantly reduces wear, thereby improving the service life of the blood pump and preventing wear debris from contaminating the blood.
[0023] In this embodiment, the eccentric drive sleeve 11 is sleeved on the outside of the vertically arranged motor output shaft 4, that is, the inner hole 17 of the eccentric drive sleeve is engaged with the motor output shaft 4, and the axis of the eccentric drive sleeve 11 is inclined to the axis of the motor output shaft 4. Furthermore, the inner hole of the eccentric drive sleeve 11 is a rectangular hole, and the cross-section of the motor output shaft 4 is rectangular.
[0024] In this embodiment, there are two first bearings 14, which are respectively sleeved on the outer sides of the upper and lower ends of the eccentric drive sleeve 11. Specifically, the eccentric drive sleeve 11 is cylindrical, with an annular flange 18 in the middle of its outer circumferential side. The inner hole 10 of the spherical pair is a stepped through hole with a decreasing diameter from top to bottom, and a retaining ring groove 19 is provided on the upper circumferential side of the inner hole 10. Of the two first bearings, the lower first bearing 14 is positioned between the bottom of the annular flange 18 and the stepped surface of the inner hole 10 at the lower end, achieving positioning. The upper first bearing 14 is positioned on the upper side of the annular flange 18, and a retaining ring 20 is provided in the retaining ring groove 19 to limit the position of the upper first bearing 14.
[0025] In this embodiment, both the first bearing 14 and the second bearing 15 are deep groove ball bearings.
[0026] In this embodiment, the inner end of the anti-rotation baffle 7 is provided with a spherical adapter 21 for adapting to the outer spherical surface of the spherical pair 9, and the arc-shaped groove 16 is coaxially provided on the side of the spherical adapter 21 facing the spherical pair 9.
[0027] In this embodiment, the pump body 1 includes a cylindrical pump shell 22, an upper pump cover 23 and a lower pump cover 24 respectively disposed at the upper and lower ends of the pump shell 22, and the pump shell 22, the upper pump cover 23 and the lower pump cover 24 together form a pump cavity. The inner circumferential side of the pump shell 22 is a spherical surface that matches the movement trajectory of the edge of the nutation disk 2. The suction port 5 and the discharge port 6 are both disposed on the spherical surface 25. The upper pump cover 23 has a stepped hole 33 in the middle to facilitate the passage of the motor output shaft 4.
[0028] In this embodiment, the outer peripheral side of the pump housing 22 is provided with a pair of cylindrical through holes 26, which are respectively connected to the suction port 5 and the discharge port 6. In use, the pair of cylindrical through holes are used to connect to the artificial blood vessel.
[0029] In this embodiment, the outer end of the anti-rotation baffle 7 is embedded in the spherical surface 25, and the anti-rotation baffle 7 is interference-fitted with the pump housing 22; the lower surface of the upper pump cover 23 and the upper surface of the lower pump cover 24 are both provided with positioning grooves 27 for installing the anti-rotation baffle 7.
[0030] In this embodiment, the lower surface of the upper pump cover 23 is a conical surface, which forms a line contact with the nutating disk 2, and a first ball socket 28 is provided in the middle of the conical surface for engaging with the upper end of the spherical pair 9; the upper surface of the upper pump cover 23 is a conical surface, which forms a line contact with the nutating disk 2, and a second ball socket 29 is provided in the middle of the conical surface for engaging with the lower end of the spherical pair 9. The spherical pair is supported by the first ball socket and the second ball socket.
[0031] In this embodiment, during assembly, the pump housing 22 is used as a base, and the anti-rotation baffle 7 is planarly positioned with the pump housing 22 and is interference-fitted onto the peripheral sidewall of the pump housing 22. The upper pump cover 23 is installed above the pump housing 22, with the upper pump cover 23 and the pump housing 22 positioned by a circumferential step. The upper pump cover 23 and the anti-rotation baffle 7 are planarly positioned, and the upper surface of the anti-rotation baffle 7 is installed onto the positioning groove 27 on the conical surface of the upper pump cover 23. The lower pump cover 24 is installed below the pump housing 22, with the lower pump cover 24 and the pump housing 22 positioned by a circumferential step. The lower pump cover 24 and the anti-rotation baffle 7 are planarly positioned, and the lower surface of the anti-rotation baffle 7 is installed onto the positioning groove 27 on the conical surface of the lower pump cover 24. Install the rectangular notch 12 of the nutation disc 2 facing the position of the anti-rotation baffle 7. After the cylindrical pin 13 at the rectangular notch 12 is fitted with the second bearing 15, it is installed into the arc-shaped groove 16 on the anti-rotation baffle 7. The ball head structure (i.e., the spherical pair 9) on the upper and lower surfaces of the nutation disc 2 is installed into the ball sockets of the upper and lower pump covers. The two first bearings 14 are assembled on the upper and lower ends of the eccentric drive sleeve 11. The snap ring 20 is inserted into the upper end of the inner hole 10 of the spherical pair. Then, the eccentric drive sleeve 11 with the two first bearings 14 is assembled into the inner hole 10 of the spherical pair of the nutation disc 2. The eccentric drive sleeve and the spherical pair are concentrically fitted, and the lower surface of the eccentric drive sleeve coincides with the lower surface of the ball head pair.
[0032] The blood pump operates primarily on the principle of nutation transmission. After assembly, the pump housing, upper pump cover, and lower pump cover form an annular cavity (i.e., the pump chamber) surrounded by a portion of a spherical surface and two inner conical surfaces. The nutation disc, acting as the blood pump rotor, moves within this cavity. The output shaft of the drive motor drives the nutation disc to nutate without rotation. The motor output shaft is inserted into the inner hole of the eccentric drive sleeve. After the drive motor starts, the rotation of the motor output shaft causes the eccentric drive sleeve to move eccentrically. The eccentric drive sleeve drives the first bearing to rotate, which in turn drives the nutation disc to oscillate. Thus, the nutation disc remains tilted, and the upper surface of the nutation disc forms line contact with the conical surface of the upper pump cover, and the lower surface of the nutation disc also forms line contact with the conical surface of the lower pump cover. The eccentric drive sleeve is fixedly connected to the motor output shaft and rotates with the motor, ensuring that the contact lines rotate synchronously with the motor. When the nutating disc is working, the cylindrical pin drives the second bearing to rotate and slides within the arc-shaped groove of the anti-rotation baffle, thus limiting the nutating disc's rotation. Consequently, under the action of the motor output shaft, the nutating disc performs a non-rotating directional oscillating motion, and the oscillation direction is consistent with the rotation direction of the drive motor. During this non-rotating nutating oscillation, the edge of the nutating disc undulates, and this undulating motion is transmitted along the circumference. If there is fluid medium on both sides of the nutating disc, the fluid medium will also undergo circumferential motion. At this time, because an anti-rotation baffle is placed at the rectangular notch of the nutating disc, the fluid flow circulation loop is interrupted, forcing the fluid to flow in a directional manner. Taking the cavity below the nutating disc as an example: Because the lower surface of the nutator disc forms a line contact with the conical surface of the lower pump cover, the contact line divides the lower cavity into two regions: the region connected to the suction port is the inlet region, and the region connected to the discharge port is the outlet region. Taking the counterclockwise rotation of the motor output shaft as an example, the nutator disc performs a counterclockwise circular oscillation without rotation of its own axis, and the contact line also rotates counterclockwise, with the contact line's rotational speed equal to the drive motor's speed. At this time, the inlet region continuously expands, creating negative pressure, and fluid flows in from the suction port. The outlet region continuously shrinks, forcing the fluid out from the discharge port. When the contact line rotates to the anti-rotation baffle position, the inlet region reaches its maximum, and the outlet region reaches its minimum. At this time, the contact line quickly passes around the anti-rotation baffle, turning the original inlet region into the outlet region. Then, the inlet region continuously expands from small to large, and the outlet region continuously shrinks from large to small, and so on in a cycle. The working condition of the cavity above the nutator disc is the same as that of the lower cavity. Simply put, the motor drives the nutplate to oscillate counterclockwise, which in turn drives the blood on both sides of the nutplate to also oscillate counterclockwise. Because the anti-rotation baffle isolates the pump chamber, the fluid is forced to flow from the inlet on the right side of the baffle to the outlet on the left side of the baffle.
[0033] The ball joint of the nutator disc mates with the ball sockets at the centers of the upper and lower pump covers to form a spherical support pair. For example... Figure 12 As shown, the nutative blood pump is located in the lateral region of the heart, near the apex. The suction port of the nutative blood pump is fixed to the apex of the left ventricle by a suture ring and communicates with the left ventricular cavity. The discharge port of the nutative blood pump is connected to the ascending aorta via an artificial blood vessel. When the nutative blood pump is working, blood from the left ventricle is drawn in by the pump and delivered to the ascending aorta through the artificial blood vessel, thus achieving blood pumping.
[0034] Without a second bearing, the cylindrical pin of the nutating disc would experience significant wear during oscillation. With the second bearing, the pin's up-and-down movement within the arc-shaped groove of the anti-rotation baffle during oscillation drives the second bearing's rotation. This second bearing can withstand complex loads, operate smoothly at high speeds, and boasts a simple yet high-precision structure. It also prevents direct contact between the cylindrical pin and the arc-shaped groove of the anti-rotation baffle, significantly reducing pin wear. Adding two first bearings and retaining rings to the eccentric drive sleeve avoids direct contact between the eccentric drive sleeve and the center of the nutating disc (i.e., the inner hole of the spherical pair), greatly reducing wear on the eccentric drive sleeve. Adding deep groove ball bearings and retaining rings at these two locations further reduces wear and increases the service life of the nutating blood pump.
[0035] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).
[0036] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.
[0037] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.
Claims
1. An implantable nutation blood pump supported by a bearing, characterized in that: The device includes a pump body with an internal pump chamber and a nutation disc disposed within the pump chamber. The pump chamber has an inlet and an outlet on its peripheral sidewall. An anti-rotation baffle is radially disposed between the inlet and outlet inside the pump chamber. The nutation disc includes a circular flat disc body. A spherical joint is disposed through the center of the circular flat disc body. An eccentric drive sleeve for connecting to the output shaft of a motor is disposed in the inner hole of the spherical joint. A first bearing for contacting the inner hole of the spherical joint is disposed on the outer side of the eccentric drive sleeve. A rectangular notch extending radially on the circular flat disc body facilitates the insertion of the anti-rotation baffle. A cylindrical pin fixed to the outer spherical surface of the spherical joint is disposed in the rectangular notch. A second bearing is disposed on the outer side of the cylindrical pin. An arc-shaped groove is disposed on the inner end of the anti-rotation baffle to facilitate the insertion of the cylindrical pin. The second bearing and the arc-shaped groove form a rolling fit.
2. The implantable nutation blood pump with bearing support according to claim 1, characterized in that: The eccentric drive sleeve is fitted on the outside of the vertically positioned motor output shaft, and the axis of the eccentric drive sleeve is inclined to the axis of the motor output shaft.
3. An implantable nutation blood pump with bearing support according to claim 1, characterized in that: There are two first bearings, which are respectively sleeved on the outer sides of the upper and lower ends of the eccentric drive sleeve.
4. An implantable nutation blood pump with bearing support according to claim 3, characterized in that: The outer peripheral side of the eccentric drive sleeve has an annular flange in the middle; the inner hole of the spherical pair is a stepped through hole, and a retaining ring groove is provided on the upper peripheral side of the inner hole of the spherical pair; the first bearing at the lower end is provided with an annular flange between the inner hole of the spherical pair and the stepped surface at the lower end; the first bearing at the upper end is provided on the upper side of the annular flange, and a retaining ring for limiting the first bearing at the upper end is provided in the retaining ring groove.
5. An implantable endovascular blood pump with bearing support according to claim 1, characterized in that: Both the first and second bearings are deep groove ball bearings.
6. An implantable nutation blood pump with bearing support according to claim 1, characterized in that: The inner end of the anti-rotation baffle is provided with a spherical fitting part for adapting to the outer spherical surface of the spherical pair, and the arc-shaped groove is coaxially provided on the side of the spherical fitting part facing the spherical pair.
7. An implantable endovascular blood pump with bearing support according to claim 1, characterized in that: The pump body includes a pump casing, an upper pump cover and a lower pump cover respectively disposed at the upper and lower ends of the pump casing, and the pump casing, the upper pump cover and the lower pump cover together form a pump cavity. The inner circumferential side of the pump casing is a spherical surface that matches the movement trajectory of the nutation disc edge. The suction port and the discharge port are both disposed on the spherical surface. A stepped hole is opened in the middle of the upper pump cover to facilitate the passage of the motor output shaft.
8. An implantable endovascular blood pump with bearing support according to claim 7, characterized in that: The outer peripheral side of the pump casing is provided with a pair of cylindrical through holes, which are respectively connected to the suction port and the discharge port.
9. An implantable endovascular blood pump with bearing support according to claim 7, characterized in that: The outer end of the anti-rotation baffle is embedded in the spherical surface, and the anti-rotation baffle is interference-fitted with the pump casing; the lower surface of the upper pump cover and the upper surface of the lower pump cover are both provided with positioning grooves for installing the anti-rotation baffle.
10. An implantable nutation blood pump with bearing support according to claim 1, characterized in that: The lower surface of the upper pump cover is a conical surface, and a first ball socket is provided in the middle of the conical surface for engaging with the upper end of the spherical pair; the upper surface of the upper pump cover is a conical surface, and a second ball socket is provided in the middle of the conical surface for engaging with the lower end of the spherical pair.