Three-convergent wedge shaft integrated hydrodynamic suspension bearing and heart pump

Abstract

An integrated hydraulic suspension bearing with three converging wedge shaft diameters is disclosed in relation to a heart pump. The rotor of the bearing employs a spherical helical groove dynamic pressure bearing surface in the axial direction, with the helical grooves forming an inner converging wedge. The rotor and stator of the bearing form an inner cavity of an elliptical arc three-wedge dynamic pressure bearing surface, with the inner cavity formed by three pairs of elliptical arcs on the rotor and stator surfaces. Applying this integrated hydraulic suspension bearing with three converging wedge shaft diameters to the heart pump allows it to rotate and suspend within the stator cavity of the heart pump. This reduces the volume of the hydraulically suspended artificial heart pump and increases the effective bearing surface of the rotor's hydraulic suspension, facilitating the formation of a dynamic pressure film to generate dynamic pressure. This helps maintain the stability and long-term operation of the heart pump rotor. Simultaneously, the increased clearance of the dynamic pressure bearing surface enhances the hydraulically suspended artificial heart pump's resistance to hemolysis, thrombosis, and bleeding, thus facilitating effective implantation and long-term safe operation of the artificial heart pump within the human body.

Description

Technical Field

[0001] This invention relates to the field of artificial heart pump technology, and in particular to an integrated hydraulic suspension bearing with three converging wedge shaft diameters and a heart pump. Background Technology

[0002] An artificial heart pump is a mechanical device made of mechanical materials and structures that can completely or partially replace the natural blood-pumping function of the human heart, maintaining normal blood perfusion to the patient's organs and tissues. Currently, the most commonly used artificial heart pump is the contact bearing centrifugal artificial heart pump. This type uses contact bearings to support the rotor, allowing it to rotate within the stator, thus improving the rotor's motion stability. For example, Chinese patent CN112587793A discloses a ball bearing centrifugal heart pump, which is a centrifugal artificial heart pump based on ball bearing support technology. Its disadvantages include the ball bearings' tendency to compress blood, creating high shear stress fields that can cause hemolysis; and the ball bearing-supported rotor structure can easily generate non-flowing areas, leading to blood damage problems such as thrombosis and bleeding. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention aims to provide a heart pump with an integrated hydraulic suspension bearing and a three-converging wedge shaft diameter. The dynamic pressure of the radial dynamic pressure bearing in the inner cavity of the three-converging wedge and the thrust dynamic pressure bearing in the spherical wedge helical groove, as well as the rotor driving force, rotate and suspend in the inner cavity of the stator of the heart pump, thereby increasing the clearance of the dynamic pressure bearing surface and solving the blood damage problems such as hemolysis, thrombosis, and bleeding in existing artificial heart pumps.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] An integrated hydraulic suspension bearing with three converging wedge shaft diameters includes a stator 2-1 and a rotor 2-2. The stator 2-1 is connected to or designed as an integral part of the inner wall of the heart pump housing 1. The rotor 2-2 adopts a spherical helical groove dynamic pressure bearing surface in the axial direction. The spherical helical groove dynamic pressure bearing surface is formed by helical grooves 5 to form an inner converging wedge. The rotor 2-2 and the stator 2-1 form an inner cavity of an elliptical arc three-wedge dynamic pressure bearing surface. The inner cavity is formed by three pairs of elliptical arcs on the rotor and stator surfaces to form converging wedges 61.

[0006] All spiral grooves 5 have smooth rounded corners.

[0007] The front end of the convergent wedge 61 has a large gap, while the rear end has a small gap; there is a transition section 6 between adjacent convergent wedges 61.

[0008] A heart pump with an integrated hydraulic suspension bearing and three converging wedge shaft diameters includes a heart pump housing 1, an integrated hydraulic suspension bearing with three converging wedge shaft diameters 2, a central shaft 3, and a motor stator coil 4;

[0009] A central shaft 3 extends from the center of the bottom of the inner cavity of the heart pump housing 1, forming an integral structure with the heart pump housing 1. A motor stator coil 4 is assembled inside the central shaft 3, and the motor stator coil 4 is coaxial with the central shaft 3. The outer periphery of the motor stator coil 4 is a motor rotor permanent magnet 22, which is embedded inside the rotor 2-2 of the three-converging wedge-diameter integrated hydraulic suspension bearing 2. An impeller 21 is positioned above the rotor 2-2 of the three-converging wedge-diameter integrated hydraulic suspension bearing 2. A longitudinally penetrating flow channel is formed between the central shaft 3 and the three-converging wedge-diameter integrated hydraulic suspension bearing 2.

[0010] The heart pump housing 1 has a blood outlet 7 and a blood inlet 8 on the outside of its inner cavity, with the blood inlet 8 located above the heart pump housing 1 and the blood outlet 7 located on the side of the heart pump housing 1.

[0011] The heart pump housing 1 is divided into an upper shell and a lower shell. The contact surfaces of the upper shell and the lower shell have the same shape, and the upper shell and the lower shell are relatively fixed and sealed by a detachable connection.

[0012] The rotor 2-2, impeller 21, and motor rotor permanent magnet 22 of the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters are designed as an integrated rotor.

[0013] A spiral blood-pressure chamber 12 with a circular cross-section is formed between the blood outlet 7 and the impeller 21 outlet.

[0014] A non-tapered, straight-cone blood-suction chamber 11 is formed between the blood inlet 8 and the impeller 21 inlet.

[0015] The permanent magnets 22 of the motor rotor are arranged radially and uniformly in the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The present invention relates to a heart pump rotor that utilizes an integrated hydraulic suspension bearing with three converging wedge shaft diameters to rotate and suspend within the stator cavity of the heart pump. The integrated hydraulic suspension bearing with three converging wedge shaft diameters employs an elliptical arc dynamic pressure bearing surface in the radial direction and a spherical spiral groove dynamic pressure bearing surface in the axial direction. This design reduces the volume of the hydraulically suspended artificial heart pump and increases the effective bearing surface of the rotor 2-2, facilitating the formation of a dynamic pressure liquid film to generate dynamic pressure. This is beneficial for maintaining the stability and long-term operation of the heart pump rotor. Simultaneously, the increased clearance of the dynamic pressure bearing surface enhances the hydraulically suspended artificial heart pump's resistance to hemolysis, thrombosis, and bleeding, thus promoting effective implantation and long-term safe operation of the artificial heart pump within the human body. Attached Figure Description

[0018] Figure 1This invention provides a schematic diagram of the radial structure and motion of rotor 2-2 of an integrated hydraulic suspension bearing with three converging wedge shaft diameters; wherein, Figure 1 (a) is a schematic diagram of the radial structure of rotor 2-2. Figure 1 (b) is a schematic diagram of the direction of motion.

[0019] Figure 2 This is a schematic diagram of the rotor 2-2 of an integrated hydraulic suspension bearing with three converging wedge shaft diameters provided by the present invention.

[0020] Figure 3 This is a schematic longitudinal cross-sectional view of the heart pump of the present invention.

[0021] Figure 4 This is a schematic diagram of the stator 2-1 and the heart pump housing 1 of the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters of the present invention.

[0022] Figure 5 This is a schematic diagram of the rotor 2-2 structure of the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters of the present invention.

[0023] In the diagram: 1. Heart pump housing; 11. Suction chamber; 12. Compression chamber; 2. Integrated hydraulic suspension bearing with three converging wedges; 2-1 Stator; 2-2 Rotor; 21. Impeller; 22. Motor rotor permanent magnet; 3. Central shaft; 4. Motor stator coil; 5. Helical groove; 6. Transition section; 61. Elliptical arc converging wedge; 7. Blood outlet; 8. Blood inlet. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] A three-converging wedge-shaped integrated hydraulic suspension bearing includes a stator 2-1 and a rotor 2-2, wherein the stator 2-1 is connected to or designed as an integral part of the inner wall of the heart pump housing 1.

[0028] like Figure 1 , Figure 4 , Figure 5 As shown, the bearing has an inner cavity formed by the rotor 2-2 and stator 2-1 in the radial direction, which is an elliptical arc three-wedge dynamic pressure bearing surface. The inner cavity is formed by three pairs of elliptical arcs on the surfaces of the rotor 2-1 and stator 2-2, forming a converging wedge 61. When working, it will generate a radial suspension force, which is directly loaded on the bearing rotor 2-2.

[0029] Each elliptical arc converging wedge 61 has a large front-end gap and a small rear-end gap, forming a smooth elliptical transition. The three elliptical arc converging wedges 61 have completely identical dimensions and structures. There are smooth transition sections 6 between each pair of elliptical arc converging wedges 61, which increases the effective bearing surface of the radial upper bearing rotor 2-2 and also increases the gap of the radial upper bearing surface. This facilitates the generation of levitation force by the radial upper bearing due to the dynamic pressure effect after the radial upper bearing rotor 2-2 starts to rotate. The design of the three-wedge inner cavity allows the surfaces of the bearing rotor 2-2 and the bearing stator 2-1 to be fully flushed, thus minimizing the risk of thrombosis.

[0030] like Figure 2 As shown, the rotor 2-2 employs a spherical helical groove dynamic pressure bearing surface in the axial direction. The spherical helical groove dynamic pressure bearing surface is formed by an inwardly converging wedge created by the helical groove 5. Besides generating levitation force, the helical groove 5 also guides the flow. After the thrust bearing rotor 2-2 rotates, it guides the fluid to flow outward, promoting backflow and increasing the scrubbing of the surfaces of the bearing rotor 2-2 and bearing stator 2-1. Simultaneously, the helical grooves 5 all have smooth rounded corners, reducing the risk of stagnation and thrombosis. In this embodiment of the invention, the depth of the helical groove 5 and the dynamic pressure liquid film are on the same order of magnitude; the specific manufacturing method can refer to any existing technology.

[0031] like Figure 3 As shown, the present invention provides a heart pump with an integrated hydraulic suspension bearing and a three-converging wedge shaft diameter, comprising a heart pump housing 1, an integrated hydraulic suspension bearing with a three-converging wedge shaft diameter 2, a central shaft 3, and a motor stator coil 4.

[0032] A central shaft 3 extends from the center of the bottom of the inner cavity of the heart pump housing 1, forming an integral structure with the heart pump housing 1. A motor stator coil 4 is assembled inside the central shaft 3, and the motor stator coil 4 is coaxial with the central shaft 3. The outer periphery of the motor stator coil 4 is the motor rotor permanent magnet 22, which is embedded inside the rotor 2-2 of the integrated three-converging wedge diameter hydraulic suspension bearing 2. An impeller 21 is integrally designed above the rotor 2-2 of the integrated three-converging wedge diameter hydraulic suspension bearing 2. The central shaft 3 and the integrated three-converging wedge diameter hydraulic suspension bearing... A longitudinally continuous flow channel is formed between the floating bearings 2; the three-wedge shaft diameter integrated hydraulic suspension bearing 2 forms a dynamic pressure liquid film with equal gap spherical bearing surface in the axial direction, which can generate radial and axial suspension force pointing towards the blood pump inlet; the gap formed radially in the three-wedge shaft diameter integrated hydraulic suspension bearing 2 is in the shape of a tube with equal cross section along the inner cavity of the three-wedge dynamic pressure bearing surface; the three-wedge shaft diameter integrated hydraulic suspension bearing 2 and the electromagnetic driving force generated work together to prevent the rotor 2-2 from getting too close to or even contacting the heart pump housing 1 in any direction.

[0033] The heart pump housing 1 has a blood outlet 7 and a blood inlet 8 externally located within its inner cavity. The blood inlet 8 is located above the heart pump housing 1, and the blood outlet 7 is located on the side of the heart pump housing 1. During centrifugation, the fluid flowing in through the blood inlet 8 is guided by the conical tip of the central shaft 3, with some entering the flow channel and flowing axially and radially towards the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters. A portion flows towards the impeller surface 21 and, along the impeller 21, centrifuges towards the blood outlet 7, thereby increasing the blood pressure at the blood outlet and perfusing blood into the patient's organs and tissues. The impeller 21 has a semi-open structure, which is simple to manufacture and causes minimal shear damage to the blood. This embodiment of the invention does not provide specific details regarding the design parameters and principles of the impeller 21, such as the inlet diameter and the number of blades.

[0034] The heart pump housing 1 is divided into an upper shell and a lower shell. The contact surfaces of the upper and lower shells have completely identical shapes, and the upper and lower shells are relatively fixed and sealed by a detachable connection method, such as using existing technologies like screw connections. The heart pump housing 1 adopts a volute shape, but cylindrical, conical, or other shapes suitable for blood centrifugation can also be used.

[0035] The rotor 2-2, impeller 21, and motor rotor permanent magnet 22 of the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters are designed as an integrated rotor.

[0036] A spiral-shaped blood-pressure chamber 12 with a circular cross-section is formed between the blood outlet 7 and the impeller 21 outlet. The blood flowing out of the impeller 21 is collected and transported to the blood outlet 7, reducing the flow velocity of the blood flowing out of the impeller 21, converting kinetic energy into static pressure energy, and eliminating the rotation of the blood flowing out of the rotating impeller 21 to avoid hydraulic loss.

[0037] A non-tapered, straight conical blood suction chamber 11 is formed between the blood inlet 8 and the impeller 21 inlet. The flow rate from the blood inlet 8 to the impeller 21 inlet is uniform, ensuring a consistent and stable flow of the fluid to the impeller 21 inlet. Because the heart pump structure is relatively small, the taper of the blood suction chamber is not large. Furthermore, for ease of manufacturing, the blood suction chamber is directly machined into a non-tapered, straight conical shape 11.

[0038] The motor rotor permanent magnets 22 are arranged radially and uniformly within the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters. The rotation of the integrated hydraulic suspension bearing 2 is driven by the NS-level alternating rotating magnetic field generated by the motor stator coils 4 mounted inside the central shaft 3. The motor of the motor rotor permanent magnets 22 is a brushless DC motor containing a position control feedback system. This system constantly monitors the position of the integrated hydraulic suspension bearing 2 with three converging wedge shaft diameters and makes appropriate adjustments to ensure stable operation. This part can be implemented with reference to existing technologies and is not specifically limited in this invention.

[0039] The working principle of this invention is as follows: Blood enters the heart pump through the blood inlet 8, flows through the conical tip of the central shaft 3, passes through the impeller 21, and flows axially and radially towards the integrated hydraulic suspension bearing 2 with three converging wedge diameters. Driven by a brushless motor consisting of the permanent magnet of the motor rotor 22 and the current-carrying stator coils 4 inside the central shaft 3, the bearing rotates, forming a radial blood support force that isolates the stator 2-1 and rotor 2-2 of the integrated hydraulic suspension bearing 2 with three converging wedge diameters in the radial direction. Similarly, the axial rotation drives the blood to form an axial blood support force, isolating the stator 2-1 and rotor 2-2 of the integrated hydraulic suspension bearing 2 with three converging wedge diameters in the axial direction. This achieves complete hydraulic suspension of the rotor 2-2 in the integrated hydraulic suspension bearing 2 with three converging wedge diameters. The fully hydraulically suspended rotor 2-2 drives the blood to collect and be transported to the blood outlet 7 via the impeller 21, thus realizing the output of blood.

[0040] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A three-convergent wedge shaft-diameter integrated hydrodynamic suspension bearing comprising a stator (2-1) and a rotor (2-2), characterized in that, The stator (2-1) is connected to or designed as an integral part of the inner wall of the heart pump housing (1); the rotor (2-2) adopts a spherical spiral groove dynamic pressure bearing surface in the axial direction, and the spherical spiral groove dynamic pressure bearing surface is formed by spiral groove (5) to form an inner converging wedge; the rotor (2-2) and the stator (2-1) form an inner cavity of an elliptical arc three-converging wedge dynamic pressure bearing surface, and the inner cavity is formed by three pairs of rotor and stator surface elliptical arcs to form a converging wedge (61).

2. A three-convergent wedge-axle-radial integrated hydrodynamic suspension bearing according to claim 1, characterized in that, The spiral grooves (5) are all rounded with smooth corners.

3. A three-convergent wedge-axle-radial integrated hydrodynamic suspension bearing according to claim 1, characterized in that, The front end of the convergence wedge (61) has a large gap and the rear end has a small gap; there is a transition section (6) between adjacent convergence wedges (61).

4. A three-converging wedge shaft diameter integrated hydraulic suspension bearing heart pump, characterized in that, The device includes a heart pump housing (1), a three-converging wedge diameter integrated hydraulic suspension bearing (2) according to any one of claims 1-3, a central shaft (3), and a motor stator coil (4). A central shaft (3) is drawn from the center of the bottom of the heart pump housing (1), and is an integral structure with the heart pump housing (1); a motor stator coil (4) is assembled inside the central shaft (3), and the motor stator coil (4) is coaxial with the central shaft (3); the outer periphery of the motor stator coil (4) is the motor rotor permanent magnet (22), and the motor rotor permanent magnet (22) is embedded inside the rotor (2-2) of the three-converging wedge shaft diameter integrated hydraulic suspension bearing (2), and an impeller (21) is arranged above the rotor (2-2) of the three-converging wedge shaft diameter integrated hydraulic suspension bearing (2); a longitudinally penetrating flow channel is formed between the central shaft (3) and the three-converging wedge shaft diameter integrated hydraulic suspension bearing (2); The heart pump housing (1) has a blood outlet (7) and a blood inlet (8) on the outside of its inner cavity, with the blood inlet (8) located above the heart pump housing (1) and the blood outlet (7) located on the side of the heart pump housing (1).

5. The integrated hydraulic suspension bearing pump with three converging wedge shaft diameters according to claim 4, characterized in that, The heart pump housing (1) is divided into an upper shell and a lower shell. The contact surfaces of the upper shell and the lower shell have the same shape, and the upper shell and the lower shell are relatively fixed and sealed by a detachable connection.

6. The integrated hydraulic suspension bearing heart pump with three converging wedge shaft diameters according to claim 4, characterized in that, The rotor (2-2), impeller (21), and motor rotor permanent magnet (22) of the three-converging wedge shaft integrated hydraulic suspension bearing (2) are designed as an integrated rotor.

7. The integrated hydraulic suspension bearing pump with three converging wedge shaft diameters according to claim 4, characterized in that, A spiral blood-pressure chamber (12) with a circular cross-section is formed between the blood outlet (7) and the impeller (21) outlet.

8. The integrated hydraulic suspension bearing heart pump with three converging wedge shaft diameters according to claim 4, characterized in that, A non-tapered, straight-cone blood-suction chamber (11) is formed between the blood inlet (8) and the impeller (21) inlet.

9. The integrated hydraulic suspension bearing pump with three converging wedge shaft diameters according to claim 4, characterized in that, The permanent magnets (22) of the motor rotor are arranged radially and uniformly in the integrated hydraulic suspension bearing (2) with three converging wedge shaft diameters.

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