Blood discharge cage and blood pump thereof

Abstract

According to the bleeding cage and the blood pump thereof, the blood mixing loss can be reduced, the supporting strength is good, the whole bleeding cage is in a circular tube shape, a far-end opening of the bleeding cage forms a blood inlet, a bleeding opening and a flushing outlet are formed in the outer wall of the bleeding cage, and the bleeding opening and the flushing outlet are formed in the axial direction at intervals. Normal blood pumped by the blood pump flows out from the blood outlet, and flushing fluid flows out from the flushing outlet after flushing the gap, so that energy loss caused by blood mixing is reduced, and the hydraulic performance of the blood pump is improved; the bleeding cage has a certain length in the axial direction, and the bleeding opening and the flushing outlet are arranged at an interval, so that the overall structural strength of the bleeding cage is ensured, and the bleeding cage is prevented from being deformed due to stress; meanwhile, the turbulence influence generated when blood flows through the bleeding cage is reduced, stable rotation of the magnet is improved, and then the rotation stability of the whole blood pump is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to a bleeding cage and its blood pump. Background Technology

[0002] A blood pump, also known as a mechanical blood circulation support device or heart pump assembly, can be introduced into the heart and can be configured to assist or replace natural heart function by circulating or continuously pumping blood, providing hemodynamic support for cardiogenic shock and acute heart failure. The bleeding cage, the component of the blood pump, directly affects blood flow rate, velocity, head, ejection direction, and hemolysis, thus placing higher demands on its design. Summary of the Invention

[0003] The purpose of this invention is to provide a bleeding cage and its blood pump that can reduce blood mixing loss and have good support strength.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a bleeding cage, the bleeding cage is in the shape of a cylindrical tube, the distal end of which is open to form a blood inlet, and the outer wall of the bleeding cage is provided with a bleeding outlet and a rinsing outlet, and the bleeding outlet and the rinsing outlet are arranged at intervals in the axial direction.

[0005] The bleeding outlet is located in the middle section of the bleeding cage, which divides the bleeding cage into a distal section, a middle section, and a proximal section. Multiple bleeding outlets are evenly and intermittently arranged in the circumferential direction of the middle section, and multiple flushing outlets are evenly and intermittently arranged in the proximal section.

[0006] The flushing outlet is formed by a notch extending from the proximal end to the distal end of the near-pipe section. The notch has a U-shaped cross-section, and the notches are set one-to-one with the bleeding outlets. The support columns between adjacent bleeding outlets and the connecting columns between adjacent notches are arranged one-to-one in the axial direction.

[0007] The bleeding point includes a first side and a second side parallel to the axis, a third side distal to the axis, and a fourth side proximal to the axis. The fourth side is a straight side and is arranged perpendicular to the first and second sides. The third side is an arc-shaped side and has an asymmetrical structure, with its curvature gradually increasing in the clockwise direction.

[0008] The radius of the rounded corner between the first and third sides is 0.6mm to 0.8mm, the radius of the rounded corner between the first and fourth sides is 0mm to 0.3mm, the radius of the rounded corner between the second and third sides is 0.6mm to 0.8mm, and the radius of the rounded corner between the second and fourth sides is 0mm to 0.3mm.

[0009] The flushing outlet includes a fifth and a sixth side that are parallel to each other on the axial side, and a seventh side that is on the far side. The seventh side is a straight side and is arranged perpendicular to the fifth and sixth sides. The radius of the rounded corner between the fifth and sixth sides is 0.3 mm to 0.6 mm.

[0010] The inner and outer edges of each side of the bleeding opening are chamfered, and the chamfered areas are coated with colloid.

[0011] The length of the distal pipe section L1 is 4mm to 5mm, the length of the middle pipe section L2 is 4mm to 5mm, the length of the proximal pipe section L3 is 5mm to 6mm, and the length of the notch L3 is 1mm to 1.5mm.

[0012] An installation groove is provided at the end of the far pipe section, and the support rod is inserted into the installation groove to form a fixed connection. The axial direction of the support rod is parallel to the radial direction of the far pipe section.

[0013] A blood pump includes a bleeding cage and a drive mechanism connected to the bleeding cage. An impeller is disposed inside the bleeding cage, and the drive mechanism drives the impeller to rotate. Blood enters from the blood inlet and flows out from the bleeding outlet and the flushing outlet.

[0014] The above-mentioned solution has at least the following beneficial effects: 1. Normal blood pumped by the blood pump flows out from the bleeding point, while the flushing fluid flows out from the flushing outlet after rinsing the gap, reducing energy loss caused by blood mixing and improving the hydraulic performance of the blood pump. 2. Because the bleeding cage has a certain length in the axial direction, the bleeding outlet and the flushing outlet are set at intervals to ensure the overall structural strength of the bleeding cage and prevent it from deforming under stress. 3. When blood flows through the bleeding cage, it will form turbulence, which can easily affect the rotation and make it unstable. The cover between the bleeding port and the flushing port protects the magnet and prevents the impeller from rotating unstablely due to blood turbulence. 4. Due to the presence of the cover between the bleeding port and the flushing port, blood flows evenly from the periphery of the magnet, carrying away the heat generated during the operation of the magnet in a timely and even manner, preventing denaturation of blood proteins. Attached Figure Description

[0015] Figure 1 For the three-dimensional blood cage Figure 1 ; Figure 2 for Figure 1 A schematic diagram of the structure after removing the support rods; Figure 3 For the three-dimensional blood cage Figure 2 ; Figure 4 for Figure 1 The main view; Figure 5 For the simple bleeding point Figure 1 ; Figure 6 For the simple bleeding point Figure 2 ; Figure 7 This is a schematic diagram of a blood pump. Detailed Implementation

[0016] To facilitate understanding, we first define the orientation: "proximal" or "proximal" refers to the side closest to the operator / doctor, while "distal" or "distal" refers to the side furthest from the operator / doctor, i.e., the side closest to the heart. See the attached diagram for further details. Figure 1-7 The present invention will be described in further detail below.

[0017] A bleeding cage 10 is generally cylindrical, with its distal end open to form a blood inlet 11. The outer wall of the bleeding cage 10 has a bleeding outlet 12 and a flushing outlet 13, which are spaced apart axially. This bleeding cage 10 is used in a magnetically coupled blood pump. The working principle of this blood pump is briefly described below: The blood pump includes an impeller 30 and a drive mechanism 20. A magnet is fixed to the proximal end of the impeller 30. The coil windings of the drive mechanism 20 are sequentially controlled to generate a rotating magnetic field. The magnet interacts with the rotating magnetic field to drive the rotation of the impeller 30. This eliminates the need for bearings, reducing the number of moving parts and allowing for a simplified mechanical structure. A small volume can provide high torque, and the small size reduces invasiveness. Furthermore, the absence of bearings reduces wear, extending the lifespan of the blood pump and making it suitable for long-term hemodynamic support. The bleeding cage 10 in this invention is positioned outside the impeller 30 and magnet of the magnetically coupled blood pump.

[0018] In the magnetic coupling drive mode, there is a gap between the magnet and the drive mechanism housing. To prevent blood from stagnating in this gap, flushing fluid is needed to flush it and ensure that the blood is in a flowing state. Therefore, a flushing outlet 13 is provided at the corresponding position of the bleeding cage 10. Normal blood pumped by the blood pump flows out from the bleeding port 12, while flushing fluid (blood or other) flows out from the flushing outlet 13 after flushing the gap, reducing energy loss caused by blood mixing and improving the hydraulic performance of the blood pump. At the same time, since the bleeding cage 10 is covered on the outer periphery of the impeller 30 and the magnet, it has a certain length in the axial direction. If the bleeding port 12 and the flushing outlet 13 are set as a large integrated outlet, it will reduce the overall strength of the bleeding cage and increase the possibility of deformation. Once the bleeding cage deforms, the impeller 30 may rub against the inner wall of the bleeding cage 10, affecting the normal rotation of the impeller 30 and causing blood damage. The above phenomenon must be prevented. Therefore, in this invention, the bleeding port 12 and the flushing outlet 13 are spaced apart and connected by a solid tube in between, which ensures the overall structural strength of the bleeding cage 10, prevents it from deforming under stress, and ensures the stable rotation of the impeller 30. Moreover, since there is no fixed connection between the impeller 30 and the near end of the magnet and the drive mechanism housing, turbulence will be formed when blood flows through the bleeding cage 10. The rotation will be unstable when affected by turbulence. Here, the magnet is protected by the cover between the bleeding port 12 and the flushing outlet 13, which reduces turbulence, facilitates stable rotation, reduces energy dissipation, and prevents blood from stagnating in the gap between the magnet and the drive mechanism housing.

[0019] The specific structure is as follows: the bleeding port 12 is located in the middle section of the bleeding cage 10, dividing the bleeding cage 10 into a distal section 10a, a middle section 10b, and a proximal section 10c. Multiple bleeding ports 12 are evenly spaced along the circumference of the middle section 10b, and multiple flushing outlets 13 are evenly spaced along the proximal section 10c. When applied to a magnetically coupled blood pump, the distal section 10a covers the outer periphery of the distal section of the impeller 30 and is connected to the sleeve. The middle section 10b covers the proximal end of the impeller 30, and its bleeding ports 12 allow blood from the tail of the impeller 30 to flow out. The proximal section 10c covers the outer periphery of the magnet and is connected to the housing of the drive mechanism. Its flushing outlets 13 correspond precisely to the gap between the housing and the magnet, ensuring that the blood within this gap remains in a flowing state, thus preventing blood coagulation and the formation of blood clots, and improving the overall performance of the blood pump. Simultaneously, the blood flowing through the outer periphery of the magnet also carries away the heat generated during magnet operation, improving the safety of the blood pump.

[0020] To simplify the manufacturing process, the flushing outlet 13 is formed by a notch extending distally from the proximal end of the near-pipe section 10c. The notch has a U-shaped cross-section, making the manufacturing process simpler than creating windows on the pipe body. Furthermore, the notches correspond one-to-one with the bleeding outlets 12, and the supports 14 between adjacent bleeding outlets 12 and the connecting columns 15 between adjacent notches are arranged axially in a one-to-one correspondence. Depending on the required blood flow rate, 2 to 4 bleeding outlets 12 are provided. Too few windows can easily cause the overall structure to scratch the vessel wall during entry into the blood vessels and heart, while too many windows can lead to insufficient flow and increased hemolysis. Therefore, selecting an appropriate number of windows is crucial; simultaneously, the choice of the number of windows must also consider its impact on the overall structural strength of the bleeding cage 10.

[0021] Furthermore, the bleeding outlet 12 includes a first side 121 and a second side 122 parallel to the axial direction, a distal third side 123, and a proximal fourth side 124. The fourth side 124 is a straight edge and is arranged perpendicular to the first side 121 and the second side 122. To reduce hemolysis, the third side 123 is an arc-shaped edge and has an asymmetrical structure, with its curvature gradually increasing clockwise. For the blood pump in this invention, the impeller 30 rotates clockwise, therefore the swirling direction of blood at the tail of the impeller 30 is also clockwise. Setting the curvature of the third side 123 to gradually increase clockwise reduces the impact of blood on the support, thus reducing hemolysis. Figure 6 and Figure 7 These are two simplified diagrams of the bleeding opening 12. The curvature of the third side 123 changes at different rates. As can be seen from the diagram, the upper part of the third side 123 changes more slowly and has a smaller curvature, while the lower part of the third side 123 changes more steeply and has a larger curvature.

[0022] As a preferred embodiment of the present invention, the radius of the rounded corner between the first side 121 and the third side 123 is 0.6mm to 0.8mm, the radius of the rounded corner between the first side 121 and the fourth side 124 is 0 to 0.3mm, the radius of the rounded corner between the second side 122 and the third side 123 is 0.6mm to 0.8mm, and the radius of the rounded corner between the second side 122 and the fourth side 124 is 0 to 0.3mm, further reducing hemolysis.

[0023] Similarly, the flushing outlet 13 includes a fifth side 131 and a sixth side 132 that are parallel to each other on the axial side, and a seventh side 133 on the far side. The seventh side 133 is a straight side and is arranged perpendicular to the fifth side 131 and the sixth side 132. The radius of the rounded corner between the fifth side 131 and the sixth side 132 is 0.3mm to 0.6mm.

[0024] The inner and outer edges of each side of the bleeding site 12 are chamfered, and the chamfered areas are coated with colloid, allowing blood to flow along the chamfered edges and further reducing hemolysis.

[0025] Furthermore, the length L1 of the distal pipe section 10a is 4mm to 5mm, the length L2 of the middle pipe section 10b is 4mm to 5mm, the length L3 of the proximal pipe section 10c is 5mm to 6mm, and the length L3 of the notch is 1mm to 1.5mm.

[0026] Since this invention is applied in a magnetically coupled blood pump, the proximal end of the impeller 30 is not fixed to the housing of the drive mechanism. To improve the smoothness of the impeller 30's rotation, a mounting groove 16 is provided at the end of the distal tube section 10a. The support rod 17 is inserted into the mounting groove 16 to form a fixed connection, and the axial direction of the support rod 17 is parallel to the radial direction of the distal tube section 10a. Thus, after the distal end of the impeller 30 and the support rod 17 are assembled, they form a circumferential rotation and circumferential limiting fit, thereby improving the stability of the impeller 30's rotation. Ideally, the end of the support rod 17 should be flush with the outer circumferential surface of the distal tube section 10a to reduce the outer diameter of the blood cage 10 and also reduce damage to the blood vessel during intervention. Of course, both ends of the support rod 17 can also be directly fixed to the inner wall of the distal tube section 10a; the connection methods include, but are not limited to, the two methods described above.

[0027] like Figure 5 As shown, a blood pump includes a bleeding cage 10 and a drive mechanism 20 connected to the bleeding cage 10. An impeller 30 is disposed within the bleeding cage 10. The drive mechanism 20 drives the impeller 30 to rotate. Blood enters through the inlet 11 and flows out through the bleeding outlet 12 and the flushing outlet 13. The coil windings of the drive mechanism 20 are sequentially controlled to generate a rotating magnetic field. A magnet coaxially fixed to the impeller 30 interacts with the rotating magnetic field to drive the rotation of the impeller 30. This blood pump eliminates the need for bearings, reducing the number of moving parts and allowing for a simplified mechanical structure. Its small size provides high torque, and its small size reduces invasiveness. Furthermore, the absence of bearings reduces wear, extending the pump's lifespan and making it suitable for prolonged hemodynamic support. When blood is pumped into the blood flow channel 10, most of the blood flows directly out from the bleeding outlet 12, while a small portion continues to flow downstream along the inner cavity of the bleeding cage 10 and enters the end face gap between the drive mechanism 20 and the magnet through the flushing outlet 13, preventing blood from stagnating in this gap and forming a thrombus. Using blood directly as the flushing fluid eliminates the need for additional flushing fluid and its pathway, simplifying the structure of the blood pump.

[0028] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bleeding cage (10) is generally cylindrical, with its distal end open to form a blood inlet (11), characterized in that: The outer wall of the bleeding cage (10) is provided with a bleeding port (12) and a rinsing outlet (13), and the bleeding port (12) and the rinsing outlet (13) are arranged at intervals in the axial direction.

2. The bleeding cage according to claim 1, characterized in that: The bleeding outlet (12) is located in the middle section of the bleeding cage (10) and divides the bleeding cage (10) into a distal pipe section (10a), a middle pipe section (10b) and a proximal pipe section (10c). Multiple bleeding outlets (12) are evenly and intermittently arranged in the circumferential direction of the middle pipe section (10b), and multiple flushing outlets (13) are evenly and intermittently arranged in the proximal pipe section (10c).

3. The bleeding cage according to claim 2, characterized in that: The flushing outlet (13) is formed by a notch extending from the proximal end to the distal end of the near pipe section (10c). The notch has a U-shaped cross section and is set one-to-one with the bleeding outlet (12). The support column (14) between adjacent bleeding outlets (12) and the connecting column (15) between adjacent notches are arranged one-to-one in the axial direction.

4. The bleeding cage according to claim 2, characterized in that: The bleeding opening (12) includes a first side (121) and a second side (122) parallel to the axis, as well as a third side (123) on the far side and a fourth side (124) on the near side. The fourth side (124) is a straight side and is arranged perpendicular to the first side (121) and the second side (122). The third side (123) is an arc-shaped side and has an asymmetrical structure with its curvature gradually increasing in the clockwise direction.

5. The bleeding cage according to claim 4, characterized in that: The radius of the rounded corner between the first side (121) and the third side (123) is 0.6mm to 0.8mm, the radius of the rounded corner between the first side (121) and the fourth side (124) is 0 to 0.3mm, the radius of the rounded corner between the second side (122) and the third side (123) is 0.6mm to 0.8mm, and the radius of the rounded corner between the second side (122) and the fourth side (124) is 0 to 0.3mm.

6. The bleeding cage according to claim 2, characterized in that: The flushing outlet (13) includes a fifth side (131) and a sixth side (132) that are parallel to each other on the axial side, and a seventh side (133) on the far side. The seventh side (133) is a straight side and is arranged perpendicular to the fifth side (131) and the sixth side (132). The radius of the rounded corner between the fifth side (131) and the sixth side (132) is 0.3 mm to 0.6 mm.

7. The bleeding cage according to claim 6, characterized in that: The bleeding opening (12) has chamfers on both the inner and outer edges of each side, and the chamfers are coated with colloid.

8. The bleeding cage according to claim 2, characterized in that: The length L1 of the distal pipe section (10a) is 4mm to 5mm, the length L2 of the middle pipe section (10b) is 4mm to 5mm, the length L3 of the proximal pipe section (10c) is 5mm to 6mm, and the length L3 of the notch is 1mm to 1.5mm.

9. The bleeding cage according to claim 2, characterized in that: An installation groove (16) is provided at the end of the distal pipe section (10a), and a support rod (17) is inserted into the installation groove (16) to form a fixed connection. The axial direction of the support rod (17) is parallel to the radial direction of the distal pipe section (10a).

10. A blood pump, characterized in that: The blood collection cage (10) according to any one of claims 1-9 is further comprising a drive mechanism (20) connected to the blood collection cage (10), an impeller (30) disposed inside the blood collection cage (10), the drive mechanism (20) driving the impeller (30) to rotate, and blood entering from the blood inlet (11) and flowing out from the blood outlet (12) and the rinsing outlet (13).

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