Self-balancing dual lumen nutating blood pump

Abstract

The present application relates to a kind of self-balancing double-cavity nutational blood pump, including pump cavity, pump cavity is separated into right ventricular pump cavity and left ventricular pump cavity of upper and lower distribution by stator isolation base, right ventricular pump cavity is equipped with right ventricular nutational disc, left ventricular pump cavity is equipped with left ventricular nutational disc;Center hole of stator isolation base is equipped with coaxial transmission main shaft through, coaxial transmission main shaft upper end is connected with right ventricular nutational disc by right ventricular eccentric drive sleeve, lower end is connected with left ventricular nutational disc by left ventricular eccentric drive sleeve, the inclination of right ventricular eccentric drive sleeve and left ventricular eccentric drive sleeve in circumferential direction is 180 degrees apart;Coaxial transmission main shaft drives right ventricular nutational disc and left ventricular nutational disc synchronous nutational swing of swing.The mechanical self-balancing of right ventricular pump cavity, left ventricular pump cavity is realized using 180° phase difference conjugate drive, the inherent violent mechanical vibration of single-disc nutational pump is eliminated from physical root, greatly guarantee the working stability of whole artificial heart implantation in human body and the comfort of patient.

Description

Technical Field

[0001] This invention relates to a self-balancing dual-chamber chordal blood pump. Background Technology

[0002] Heart failure is the end stage of various heart diseases. For patients with severe heart failure, heart transplantation is currently the most effective treatment, but it faces the challenge of an extreme shortage of donors. Totally artificial hearts, which use mechanical movement to propel blood circulation, are an important alternative to heart transplantation.

[0003] From a structural perspective, existing artificial heart blood pumps are mainly divided into centrifugal pumps, axial flow pumps, and volumetric pumps. Among them, centrifugal pumps have a low rotation speed but a large size, which is not conducive to implantation, especially for children. Axial flow pumps are small in size and highly efficient, but the rotor speed is generally very high, generating large shear stress, which can easily damage blood cells. Volumetric pumps are bulky and difficult to implant in children or patients with short stature.

[0004] Currently, there are also blood pumps based on the nutation principle (i.e., nutation pumps). Although they have a compact structure and low shear force, the single-disc rotor generates periodic eccentric inertial forces during high-speed precession, causing severe vibration of the device and affecting implantation stability. Furthermore, existing nutation pumps are designed for a single ventricle and cannot simultaneously meet the different physiological needs of the left and right ventricles. In view of this, the inventors proposed this invention based on the principle of conjugate kinematics. Summary of the Invention

[0005] 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 a self-balancing dual-chamber ventricular tachycardia pump that is rationally designed, meets the different physiological needs of the left and right ventricles, and has intrinsic dynamic balance characteristics.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a self-balancing dual-chamber nutation blood pump, comprising a pump body with an internal pump chamber, the pump chamber being divided into an upper and lower right ventricular pump chamber and a left ventricular pump chamber by a stator isolation base, the periphery of which is connected to an inlet and an outlet, a right ventricular nutation disk is disposed in the right ventricular pump chamber, and a left ventricular nutation disk is disposed in the left ventricular pump chamber; a coaxial drive main shaft is disposed through the central hole of the stator isolation base, the upper end of the coaxial drive main shaft is connected to the right ventricular nutation disk through a right ventricular eccentric drive sleeve, and the lower end is connected to the left ventricular nutation disk through a left ventricular eccentric drive sleeve, the right ventricular eccentric drive sleeve and the left ventricular eccentric drive sleeve are tilted 180 degrees out of phase in the circumferential direction; the coaxial drive main shaft drives the right ventricular nutation disk and the left ventricular nutation disk to nutation synchronously.

[0007] Furthermore, both the right ventricular nutation disk and the left ventricular nutation disk include a circular planar disk body, and a spherical pair is disposed through the middle of the circular planar disk body; the inner hole of the spherical pair of the right ventricular nutation disk is connected to the right ventricular eccentric drive sleeve; the inner hole of the spherical pair of the left ventricular nutation disk is connected to the left ventricular eccentric drive sleeve.

[0008] Furthermore, the right ventricular eccentric drive sleeve is fitted on the outer side of the upper end of the coaxial drive main shaft, and the axis of the right ventricular eccentric drive sleeve is inclined to the axis of the coaxial drive main shaft; the left ventricular eccentric drive sleeve is fitted on the outer side of the lower end of the coaxial drive main shaft, and the axis of the left ventricular eccentric drive sleeve is inclined to the axis of the coaxial drive main shaft; the axis of the right ventricular eccentric drive sleeve and the axis of the left ventricular eccentric drive sleeve are arranged in opposite directions by 180 degrees.

[0009] Furthermore, the inner walls of both the right ventricular pump chamber and the left ventricular pump chamber are radially provided with anti-rotation baffles; both the circular planar discs of the right ventricular nutation disk and the circular planar discs of the left ventricular nutation disk are provided with radially extending rectangular notches, the rectangular notches corresponding to the positions of the anti-rotation baffles, and the anti-rotation baffles extending into the rectangular notches to prevent the right ventricular nutation disk and the left ventricular nutation disk from rotating with the coaxial drive shaft.

[0010] Furthermore, the outer spherical surface of the spherical pair is provided with a guide post, the guide post being positioned corresponding to the rectangular notch and extending into the rectangular notch; the inner end of the anti-rotation baffle is provided with a spherical adaptation part for fitting with the outer spherical surface of the spherical pair, the spherical adaptation part having a coaxial arc-shaped groove on one side facing the spherical pair, the guide post extending into the arc-shaped groove and being able to slide along the arc-shaped groove.

[0011] Furthermore, the inlet and outlet of the right ventricular pump chamber are located on both sides of the anti-rotation baffle plate inside the right ventricular pump chamber; the inlet and outlet of the left ventricular pump chamber are located on both sides of the anti-rotation baffle plate inside the left ventricular pump chamber.

[0012] Furthermore, a right ventricular pump housing is fitted onto the outer periphery of the upper end of the stator isolation base. The inner periphery of the right ventricular pump housing is a first spherical surface that matches the movement trajectory of the edge of the right ventricular nutation disk. A right ventricular end cap is provided at the top of the right ventricular pump housing. The lower surface of the right ventricular end cap and the upper surface of the stator isolation base are both provided with a first ball socket for engaging with the spherical pair of the right ventricular nutation disk. A left ventricular pump housing is fitted onto the outer periphery of the lower end of the stator isolation base. The inner periphery of the left ventricular pump housing is a second spherical surface that matches the movement trajectory of the edge of the left ventricular nutation disk. A left ventricular end cap is provided at the bottom of the left ventricular pump housing. The upper surface of the left ventricular end cap and the lower surface of the stator isolation base are both provided with a second ball socket for engaging with the spherical pair of the left ventricular nutation disk.

[0013] Furthermore, the lower surface of the right ventricular end cap, the upper surface of the stator isolation base, the lower surface of the stator isolation base, and the upper surface of the left ventricular end cap are all provided with positioning grooves to facilitate the embedding of the anti-rotation baffle plate.

[0014] Furthermore, a permanent magnet rotor is provided in the middle of the coaxial drive spindle, and a stator coil is provided on the outer periphery of the permanent magnet rotor and installed in the central hole of the stator isolation base. The permanent magnet rotor and the stator coil constitute an inner rotor brushless motor structure.

[0015] Furthermore, the stator isolation base has a radial through hole on its peripheral side that communicates with the central hole, and a power and signal transmission interface is provided on the outer peripheral sidewall of the stator isolation base, which is connected to the radial through hole.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed and uses the conjugate drive with a 180° phase difference to achieve mechanical self-balancing of the right ventricular pump chamber and the left ventricular pump chamber. It eliminates the severe mechanical vibration inherent in the single-disc nutation pump from the physical source, which greatly ensures the working stability and patient comfort after the total artificial heart is implanted in the human body. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the disassembled state 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 a side cross-sectional view of an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the right ventricular endcap omitted in an embodiment of the present invention; Figure 6 yes Figure 5 A top-view structural diagram; Figure 7 This is a schematic diagram of the cooperation between the coaxial drive spindle and the nutation disk in an embodiment of the present invention; Figure 8 This is a cross-sectional schematic diagram of the coaxial drive spindle and the nutation disk in an embodiment of the present invention; Figure 9 This is a schematic diagram of the cooperation between the coaxial transmission main shaft and the eccentric drive sleeve in an embodiment of the present invention; Figure 10 This is a three-dimensional structural diagram of the coaxial drive spindle in an embodiment of the present invention; Figure 11 This is a three-dimensional structural diagram of the stator coil in an embodiment of the present invention; Figure 12This is a cross-sectional schematic diagram of the eccentric drive sleeve in an embodiment of the present invention; Figure 13 This is a three-dimensional structural diagram of the anti-rotation baffle plate in an embodiment of the present invention; Figure 14 This is a three-dimensional structural schematic diagram of the stator isolation base in an embodiment of the present invention; Figure 15 This is a three-dimensional structural diagram of the right ventricular endcap in an embodiment of the present invention; Figure 16 This is a schematic diagram of implantation according to an embodiment of the present invention.

[0018] In the picture: 1-Blood pump; 2-Right ventricular end cap; 3-Right ventricular pump housing; 4-Stator isolation base; 5-Left ventricular pump housing; 6-Left ventricular end cap; 7-Coaxial drive spindle; 8-Left ventricular eccentric drive sleeve; 9-Right ventricular eccentric drive sleeve; 10-Left ventricular nutation disk; 11-Right ventricular nutation disk; 12-Anti-rotation baffle; 13-Permanent magnet rotor; 14-Stator coil; 15-Right ventricular pump chamber; 151-Right ventricular pump chamber inlet; 152-Right ventricular pump chamber outlet; 16-Left ventricular pump chamber; 161-Left ventricular pump chamber inlet; 162-Left ventricular pump chamber outlet; 17-Center of stator isolation base 18-Circular planar disc; 19-Spherical pair; 20-Inner hole of eccentric drive sleeve; 21-Axis of coaxial drive main shaft; 22-Axis of right ventricular eccentric drive sleeve; 23-Axis of left ventricular eccentric drive sleeve; 24-First spherical surface; 25-First spherical socket; 26-Cylindrical through hole; 27-Second spherical surface; 28-Second spherical socket; 29-Rectangular notch; 30-Guide post; 31-Spherical adapter; 32-Arc-shaped groove; 33-Positioning groove; 34-Radial through hole; 35-Power and signal transmission interface; 36-Artificial blood vessel; 37-Suture ring; 38-Inhalation area; 39-Outflow area. 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 1-15As shown, this invention discloses a self-balancing dual-chamber nutation blood pump, which is a coaxial mechanically driven dual-chamber nutation blood pump 1 with an internal motor. Specifically, it includes a cylindrical pump body with internal pump chambers. The pump body mainly includes a right ventricular end cap 2, a right ventricular pump housing 3, a stator isolation base 4, a left ventricular pump housing 5, a left ventricular end cap 6, a coaxial drive main shaft 7, two eccentric drive sleeves, a left ventricular nutation disc 10, a right ventricular nutation disc 11, an anti-rotation baffle 12, a stator coil 15 integrated within the stator isolation base 4, and a permanent magnet rotor 13 integrated on the coaxial drive main shaft 7. The right ventricular end cap has the same structure as the left ventricular end cap, the right ventricular pump housing has the same structure as the left ventricular pump housing, and the left ventricular nutation disc has the same structure as the right ventricular nutation disc.

[0022] The specific structural scheme is as follows: the pump chamber is divided into a right ventricular pump chamber 15 and a left ventricular pump chamber 16, which are distributed vertically, via a stator isolation base 4. The right ventricular pump chamber 15 is provided with a right ventricular pump chamber inlet and a right ventricular pump chamber outlet connected to its periphery. The left ventricular pump chamber 16 is provided with a left ventricular pump inlet and a left ventricular pump outlet connected to its periphery. A right ventricular nutation disk 11 is provided inside the right ventricular pump chamber 15, and a left ventricular nutation disk 10 is provided inside the left ventricular pump chamber 16. The central hole 17 of the stator isolation base is rotatably penetrating vertically. A coaxial drive main shaft 7 is provided. The upper end of the coaxial drive main shaft 7 extends into the right ventricular pump chamber 15 and is connected to the right ventricular nutation disk 11 through the right ventricular eccentric drive sleeve 9. The lower end of the coaxial drive main shaft 7 extends into the left ventricular pump chamber 16 and is connected to the left ventricular nutation disk 10 through the left ventricular eccentric drive sleeve 8. The right ventricular eccentric drive sleeve 9 and the left ventricular eccentric drive sleeve 8 are 180 degrees out of phase in the circumferential direction. The coaxial drive main shaft 7 drives the right ventricular nutation disk 11 and the left ventricular nutation disk 10 to nutation oscillate synchronously.

[0023] In this embodiment, the right ventricular nutation disk 11 and the left ventricular nutation disk 10 have the same structure, both including a circular planar disk body 18. A spherical pair 19 is fixedly disposed through the middle of the circular planar disk body 18. The top and bottom of the spherical pair 19 are both planar, and the center of the spherical pair has an inner hole 20.

[0024] In this embodiment, both the left ventricular eccentric drive sleeve 8 and the right ventricular eccentric drive sleeve 9 are cylindrical, and their outer cylindrical surfaces have an inclination angle of 10-12° with respect to the axis of their inner holes 20. Figure 12 As shown. Furthermore, the axis 22 of the right ventricular eccentric drive sleeve is arranged 180 degrees out of phase with the axis 23 of the left ventricular eccentric drive sleeve.

[0025] In this embodiment, as Figure 8As shown, the right ventricular eccentric drive sleeve 9 extends into the inner hole of the spherical part 19 of the right ventricular nutation disk 11, and the two are fixedly connected; the left ventricular eccentric drive sleeve 8 extends into the inner hole of the spherical part 19 of the left ventricular nutation disk 10, and the two are fixedly connected.

[0026] In this embodiment, as Figure 8 As shown, the right ventricular eccentric drive sleeve 9 is fixedly sleeved on the outer side of the upper end of the coaxial drive main shaft 7, and the axis 22 of the right ventricular eccentric drive sleeve is inclined to the axis 21 of the coaxial drive main shaft; the left ventricular eccentric drive sleeve 8 is fixedly sleeved on the outer side of the lower end of the coaxial drive main shaft 7, and the axis 23 of the left ventricular eccentric drive sleeve is inclined to the axis 21 of the coaxial drive main shaft.

[0027] In this embodiment, a right ventricular pump housing 3 is fitted onto the outer periphery of the upper end of the stator isolation base 4. The right ventricular pump housing 3 is a rigid annular cylinder. The inner periphery of the right ventricular pump housing 3 is a first spherical surface 24 that matches the movement trajectory of the edge of the right ventricular nutation disk 11. A right ventricular end cap 2 is provided on the top of the right ventricular pump housing 3. The main structure of the right ventricular end cap 2 is that its upper surface is a circular plane. The middle of the lower surface of the right ventricular end cap 2 and the middle of the upper surface of the stator isolation base 4 are provided with first ball sockets 28 for cooperating with the spherical pair 19 of the right ventricular nutation disk 11. The right ventricular end cap 2, the right ventricular pump housing 3, and the upper surface of the stator isolation base 4 form a right ventricular pump chamber 15. Furthermore, a pair of cylindrical through holes 26 are provided on the outer periphery of the right ventricular pump housing 3 as fluid interfaces of the right ventricular pump chamber 15, that is, the pair of cylindrical through holes serve as the inlet and outlet of the right ventricular pump chamber, respectively.

[0028] In this embodiment, a left ventricular pump housing 5 is fitted onto the lower outer periphery of the stator isolation base 4. The structure of the left ventricular pump housing 5 is the same as that of the right ventricular pump housing 3, both being rigid annular cylinders. The inner peripheral side of the left ventricular pump housing 5 is a second spherical surface 27 that matches the movement trajectory of the edge of the left ventricular nutation disk 10. A left ventricular end cap 6 is provided at the bottom of the left ventricular pump housing 5. The main structure of the left ventricular end cap 6 is that its lower surface is a circular plane. The middle of the upper surface of the left ventricular end cap 6 and the middle of the lower surface of the stator isolation base 4 are both provided with second ball sockets 28 for cooperating with the spherical pair 19 of the left ventricular nutation disk 10. The left ventricular end cap 6, the left ventricular pump housing 5, and the lower surface of the stator isolation base 4 form the left ventricular pump cavity 16. Furthermore, a pair of cylindrical through holes 26 are also provided on the outer peripheral side of the left ventricular pump housing 5 as fluid interfaces for the left ventricular pump chamber 16, that is, the pair of cylindrical through holes serve as the inlet and outlet of the left ventricular pump chamber respectively.

[0029] In this embodiment, the inner walls of the right ventricular pump chamber 15 and the left ventricular pump chamber 16 are both radially provided with anti-rotation baffles 12. The circular planar discs 18 of the right ventricular nutation disc 11 and the left ventricular nutation disc 10 are both provided with radially extending rectangular notches 29. These rectangular notches 29 correspond to the positions of the anti-rotation baffles 12, which extend into the rectangular notches 29 to prevent the right ventricular nutation disc 11 and the left ventricular nutation disc 10 from rotating with the coaxial drive shaft 7. Due to the circumferential limiting effect of the radially arranged anti-rotation baffles, the possibility of the left and right ventricular nutation discs rotating with the coaxial drive shaft is blocked. Therefore, under the forced actuation of the eccentric drive sleeve, the two nutation discs can only perform periodic, non-rotating pure nutation oscillations within their respective ball-and-socket supports.

[0030] Since the upper and lower eccentric drive sleeves are arranged in opposite phases by 180 degrees, let the mass of the nutating disk be... angular velocity is eccentricity is : The centrifugal force vector generated by the right ventricular nutation disc: ; The centrifugal force vector generated by the ventricular ostial disc: According to Euler's formula The sum of two force vectors is always zero: .

[0031] In this embodiment, the outer spherical surface of the spherical pair 19 is provided with a guide post 30, the guide post 30 is positioned corresponding to the rectangular notch 29 and extends into the rectangular notch 29; the inner end of the anti-rotation baffle plate 12 (that is, the end facing the spherical pair) is provided with a spherical adaptation part 31 for adapting to the outer spherical surface of the spherical pair 19, the spherical adaptation part 31 is coaxially provided with an arc-shaped groove 32 on the side facing the spherical pair 19, the guide post 30 extends into the arc-shaped groove 32 and can slide along the arc-shaped groove 32, when the nutation turntable nutates, the guide post slides in the arc-shaped groove.

[0032] In this embodiment, the inlet and outlet of the right ventricular pump chamber 15 are located on both sides of the anti-rotation baffle 12 within the right ventricular pump chamber 15; the inlet and outlet of the left ventricular pump chamber 16 are located on both sides of the anti-rotation baffle 12 within the left ventricular pump chamber 16. Further, within the left ventricular pump chamber 16, a continuous contact line is formed between the outer edge of the left ventricular nutation disc 10 and the second spherical surface 27 of the inner wall of the left ventricular pump housing 5. This contact line continuously moves along both sides of the radially arranged anti-rotation baffle, strictly dividing the left ventricular pump chamber into an inlet zone 38 and an outlet zone 39. The inlet zone corresponds to the inlet, and the outlet corresponds to the outlet. During the inlet stroke, the inlet zone generates negative pressure to draw oxygen-rich blood in from the inlet; during the outlet stroke, the outlet zone gently squeezes the blood, pushing it from the outlet into the aorta to participate in systemic circulation. The smooth advancement of the nutation disc achieves stable pumping with low shear force, effectively reducing the risk of hemolysis. Completely synchronized with the left ventricular pump chamber, the right ventricular ventricular nutation disc in the right ventricular pump chamber also undergoes the same volume change cycle, pumping deoxygenated blood into the pulmonary artery.

[0033] In this embodiment, the lower surface of the right ventricular end cap 2, the upper surface of the stator isolation base 4, the lower surface of the stator isolation base 4, and the upper surface of the left ventricular end cap 6 are all provided with positioning grooves 33 to facilitate the embedding of the anti-rotation baffle plate 12. The anti-rotation baffle plate 12 in the right ventricular pump chamber 15 is embedded in the inner wall of the right ventricular pump housing 3, and the anti-rotation baffle plate 12 in the left ventricular pump chamber 16 is embedded in the inner wall of the left ventricular pump housing 5.

[0034] In this embodiment, the coaxial drive main shaft 7 and the stator isolation base 4 form an internal rotor brushless motor structure through a permanent magnet rotor 13 and a stator coil 14. The permanent magnet rotor 13 is located in the middle of the coaxial drive main shaft 7, and the stator coil 14 is located in the central hole 17 of the stator isolation base. Specifically, a ring of permanent magnets is embedded on the middle section surface of the coaxial drive main shaft 7 to form a permanent magnet rotor; the stator isolation base 4 is a disc with a certain axial thickness, and a ring-shaped sealed cavity (i.e., a central hole) is provided in its middle. The stator coil is wound on the iron core and pressed into the sealed cavity, physically isolated from the blood. The metal outer wall of the stator isolation base is in direct contact with the blood in the pump chamber, using the flowing blood to carry away the heat generated by the motor stator.

[0035] Furthermore, the stator isolation base 4 has a radial through hole 34 connected to the central hole on its peripheral side, and a power and signal transmission interface 35 is provided on the outer peripheral sidewall of the stator isolation base 4. The power and signal transmission interface 35 is connected to the radial through hole 34.

[0036] To accommodate the different physiological displacement and pressure requirements of the left and right ventricles, the left ventricular nutation disc 10, the right ventricular nutation disc 11, and the corresponding left and right ventricular eccentric drive sleeves adopt an asymmetrical structural design. Specifically, the asymmetrical structural design includes: Figure 8 As shown, the inclination angle between the left ventricular eccentric drive sleeve 8 and the coaxial transmission main shaft 7 is denoted as , and the inclination angle between the right ventricular eccentric drive sleeve 9 and the coaxial transmission main shaft 7 is denoted as . ,and ; and with asymmetric disk diameter and cavity volume design, the effective working outer diameter of the left ventricular nutating disk is denoted as The effective working diameter of the right ventricular nutating disc is denoted as ,and .

[0037] To ensure that the intrinsic mechanical self-balancing characteristics are still met after adopting the asymmetric structural design, the left ventricular nutation disk and the right ventricular nutation disk need to be dynamically balanced. Let the total mass of the left and right rotor assemblies be respectively... and The equivalent eccentricities are respectively and By adjusting the density of the disk material or adding local counterweights, the system can be made to strictly satisfy the dynamic balancing equations: .

[0038] In this embodiment, the device adopts a coaxially symmetrical hierarchical layout in terms of assembly structure. The assembly relationship is as follows: Based on the stator isolation base, the motor stator (i.e., the stator coil wound on the iron core) is pre-embedded inside it. The coaxial drive main shaft 7 passes through the central hole of the stator isolation base 4. Two eccentric drive sleeves are respectively installed on the upper and lower ends of the coaxial drive main shaft 7, ensuring that the two are out of phase. Two nutation discs are respectively fitted onto the upper and lower eccentric drive sleeves through the spherical joint 19 at the center. Two anti-rotation baffles are respectively inserted into the positioning grooves of the right ventricular pump chamber and the left ventricular pump chamber and the rectangular notch of the nutation disc. Finally, the right ventricular pump housing and the right ventricular end cover are fastened to the top of the stator isolation base, and the left ventricular pump housing and the left ventricular end cover are fastened to the bottom of the stator isolation base, and sealed and fixed by bolts or welding.

[0039] The working principle is as follows: When the blood pump starts, the motor integrated in the stator isolation base 4 drives the coaxial drive main shaft 7 to rotate at high speed, which in turn drives the left ventricular eccentric drive sleeve 8 and the right ventricular eccentric drive sleeve 9 to rotate synchronously. Due to the circumferential limiting effect of the radially arranged anti-rotation baffle 12, the possibility of the left ventricular nutation disk 10 and the right ventricular nutation disk 11 rotating with the coaxial drive main shaft 7 is blocked. Therefore, under the forced actuation of the two eccentric drive sleeves, the two nutation disks can only make periodic, non-rotating pure nutation oscillations within their respective ball-and-socket supports. In the left ventricular pump chamber, a continuous contact line is formed between the outer edge of the left ventricular nutation disk and the spherical surface of the inner wall of the left ventricular pump casing. This contact line is continuously pushed on both sides of the anti-rotation baffle, strictly dividing the left ventricular pump chamber into an inhalation zone and an exhaust zone. During the inhalation stroke, the inhalation zone generates negative pressure to draw oxygen-rich blood in from the inlet; during the exhaust stroke, the exhaust zone gently squeezes the blood, pushing it from the outlet into the aorta to participate in systemic circulation. The smooth advancement of the nutation disk enables stable pumping with low shear force, effectively reducing the risk of hemolysis. Inside the right ventricular pump chamber above the stator isolation base, the right ventricular nutation disk also undergoes the same volume change cycle, pumping deoxygenated blood into the pulmonary artery.

[0040] At any given moment during the aforementioned dual-chamber synchronous pumping, due to the strict 180-degree phase difference between the upper and lower eccentric drive sleeves in their assembly phase, the left ventricular nutating disk and the right ventricular nutating disk are always in completely opposite tilting postures. The eccentric centrifugal inertial force vectors generated by the two nutating disks during high-speed precession are always equal in magnitude and opposite in direction in space. This structural design based on conjugate kinematics allows the two mechanical excitation forces to achieve internal self-cancellation at the rigid stator isolation base. This technology eliminates the inherent severe mechanical vibration of a single-disc nutation pump from a physical source, greatly ensuring the working stability and patient comfort of the total artificial heart after implantation.

[0041] This invention addresses the problems of large size and strong vibration in existing total artificial heart blood pumps by innovatively proposing a compact coaxial dual-chamber nutation blood pump. In its working mechanism, this blood pump utilizes a conjugate drive with a 180° phase difference to achieve mechanical self-balancing. This invention provides a blood pumping structure that can simultaneously meet the different physiological needs of the left and right ventricles and possesses intrinsic dynamic balance characteristics, while meeting the requirements of limited implantation space.

[0042] 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).

[0043] 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.

[0044] 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.

[0045] 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. A self-balancing dual-chamber nutation blood pump, comprising a pump body having an internal pump chamber, characterized in that: The pump chamber is divided into upper and lower right ventricular pump chambers and left ventricular pump chambers by a stator isolation base. Both the right and left ventricular pump chambers are connected by an inlet and an outlet on their periphery. A right ventricular nutation disk is installed in the right ventricular pump chamber, and a left ventricular nutation disk is installed in the left ventricular pump chamber. A coaxial drive shaft is threaded through the central hole of the stator isolation base. The upper end of the coaxial drive shaft is connected to the right ventricular nutation disk via a right ventricular eccentric drive sleeve, and the lower end is connected to the left ventricular nutation disk via a left ventricular eccentric drive sleeve. The right and left ventricular eccentric drive sleeves are 180 degrees out of phase in the circumferential direction. The coaxial drive shaft drives the right and left ventricular nutation disks to nutate synchronously.

2. The self-balancing dual-chamber ventral blood pump according to claim 1, characterized in that: Both the right ventricular nutation disk and the left ventricular nutation disk include a circular planar disk body, and a spherical pair is provided through the middle of the circular planar disk body; the inner hole of the spherical pair of the right ventricular nutation disk is connected to the right ventricular eccentric drive sleeve; the inner hole of the spherical pair of the left ventricular nutation disk is connected to the left ventricular eccentric drive sleeve.

3. The self-balancing dual-chamber chordal blood pump according to claim 2, characterized in that: The right ventricular eccentric drive sleeve is fitted on the outer side of the upper end of the coaxial drive main shaft, and the axis of the right ventricular eccentric drive sleeve is inclined to the axis of the coaxial drive main shaft; the left ventricular eccentric drive sleeve is fitted on the outer side of the lower end of the coaxial drive main shaft, and the axis of the left ventricular eccentric drive sleeve is inclined to the axis of the coaxial drive main shaft; the axis of the right ventricular eccentric drive sleeve and the axis of the left ventricular eccentric drive sleeve are arranged in opposite directions by 180 degrees.

4. A self-balancing dual-chamber ventricular blood pump according to claim 2, characterized in that: The inner walls of the right ventricular pump chamber and the left ventricular pump chamber are both radially provided with anti-rotation baffles; the circular planar discs of the right ventricular nutation disk and the left ventricular nutation disk are both provided with radially extending rectangular notches, the rectangular notches correspond to the positions of the anti-rotation baffles, and the anti-rotation baffles extend into the rectangular notches to prevent the right ventricular nutation disk and the left ventricular nutation disk from rotating with the coaxial drive shaft.

5. A self-balancing dual-chamber chordal blood pump according to claim 4, characterized in that: The outer spherical surface of the spherical pair is provided with a guide post, which corresponds to the position of the rectangular notch and extends into the rectangular notch; the inner end of the anti-rotation baffle is provided with a spherical adaptation part for fitting with the outer spherical surface of the spherical pair, and the spherical adaptation part is coaxially provided with an arc-shaped groove on one side facing the spherical pair, and the guide post extends into the arc-shaped groove and can slide along the arc-shaped groove.

6. A self-balancing dual-chamber ventricular blood pump according to claim 4, characterized in that: The inlet and outlet of the right ventricular pump chamber are located on both sides of the anti-rotation baffle plate inside the right ventricular pump chamber, respectively; the inlet and outlet of the left ventricular pump chamber are located on both sides of the anti-rotation baffle plate inside the left ventricular pump chamber, respectively.

7. A self-balancing dual-chamber chordal blood pump according to claim 4, characterized in that: A right ventricular pump housing is fitted onto the outer periphery of the upper end of the stator isolation base. The inner periphery of the right ventricular pump housing is a first spherical surface that matches the movement trajectory of the edge of the right ventricular nutation disk. A right ventricular end cap is provided on the top of the right ventricular pump housing. The lower surface of the right ventricular end cap and the upper surface of the stator isolation base are both provided with a first ball socket for matching the spherical pair of the right ventricular nutation disk. A left ventricular pump housing is fitted onto the outer periphery of the lower end of the stator isolation base. The inner periphery of the left ventricular pump housing is a second spherical surface that matches the movement trajectory of the edge of the left ventricular nutation disk. A left ventricular end cap is provided on the bottom of the left ventricular pump housing. The upper surface of the left ventricular end cap and the lower surface of the stator isolation base are both provided with a second ball socket for matching the spherical pair of the left ventricular nutation disk.

8. A self-balancing dual-chamber chordal blood pump according to claim 7, characterized in that: The lower surface of the right ventricular end cap, the upper surface of the stator isolation base, the lower surface of the stator isolation base, and the upper surface of the left ventricular end cap are all provided with positioning grooves to facilitate the embedding of the anti-rotation baffle plate.

9. A self-balancing dual-chamber chordal blood pump according to claim 1, characterized in that: A permanent magnet rotor is provided in the middle of the coaxial drive main shaft, and a stator coil is provided on the outer periphery of the permanent magnet rotor and installed in the central hole of the stator isolation base. The permanent magnet rotor and the stator coil constitute an inner rotor brushless motor structure.

10. A self-balancing dual-chamber ventral blood pump according to claim 9, characterized in that: The stator isolation base has a radial through hole on its peripheral side that communicates with the central hole, and a power and signal transmission interface is provided on the outer peripheral side wall of the stator isolation base. The power and signal transmission interface is connected to the radial through hole.

Images