Distal end support structure of blood pump

Abstract

The far-end supporting structure of the blood pump is good in abrasion resistance, a supporting frame comprises an outer ring and an inner ring which are coaxially arranged, the outer ring and the inner ring are fixedly connected through a connecting rod, the outer ring is fixed to a blood cage, a ceramic sleeve is arranged in an inner cavity of the inner ring, and an impeller shaft is inserted into an inner cavity of the ceramic sleeve to form supporting fit. The ceramic sleeve is embedded in the inner cavity of the inner ring, and the ceramic sleeve has extremely high hardness and wear resistance, so that the problem of wear of a friction surface can be effectively avoided, the service life of the blood pump is prolonged, and the pumping performance of the blood pump is improved.

Description

Technical Field

[0001] This utility model relates to the field of ventricular assist device technology, specifically to a distal support structure for a blood pump. Background Technology

[0002] As a type of ventricular assist device, a blood pump can be introduced percutaneously into the heart and can be configured to assist or replace the natural heart pumping function by circulating or continuously pumping blood, providing hemodynamic support for cardiogenic shock and acute heart failure. For magnetically coupled blood pumps, a support structure is required at the distal end of the impeller to ensure its stability. Under long-term rotation, severe wear of this distal support can affect the stability of the impeller rotation, thereby impacting the overall hydraulic and hemolytic performance of the blood pump. Utility Model Content

[0003] The purpose of this invention is to provide a distal support structure for a blood pump with good wear resistance.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a distal support structure for a blood pump, the support frame including an outer ring and an inner ring arranged coaxially, the outer ring and the inner ring being fixedly connected by a connecting rod, the outer ring being fixed to the blood cage, the inner cavity of the inner ring being provided with a ceramic sleeve, and the impeller shaft being inserted into the inner cavity of the ceramic sleeve to form a support fit.

[0005] The inner ring has a variable inner diameter, including a large diameter section on the far side and a small diameter section on the near side, with a step between them. The ceramic sleeve is inserted into the inner cavity of the large diameter section from the far end of the inner ring, and the near end face of the ceramic sleeve abuts against the step to form an axial limiting fit. The far end face of the ceramic sleeve is flush with the far end face of the inner ring.

[0006] The inner diameter of the ceramic sleeve is equal to the inner diameter of the small diameter section, and the connection surface transitions smoothly.

[0007] The inner diameter of the ceramic sleeve is smaller than the inner diameter of the smaller diameter section.

[0008] The inner diameter of the large-diameter section is a tapered hole that gradually increases from near to far, and the inner diameter of the ceramic sleeve is equal to the diameter of the far side of the tapered hole.

[0009] The axial length of the ceramic sleeve is greater than 1 / 2 of the axial length of the inner ring.

[0010] The outer ring is configured with a variable outer diameter, including a large diameter section on the far side and a small diameter section on the near side, forming a step between them. The small diameter section is inserted into the inner cavity of the blood cage and fits tightly against the inner wall of the blood cage. The step abuts against the far end face of the blood cage. The outer diameter of the large diameter section is equal to the outer diameter of the blood cage, and the connection surface is smoothly transitioned.

[0011] In the above solution, a ceramic sleeve is embedded in the inner cavity of the inner ring. The ceramic sleeve has extremely high hardness and wear resistance, which can effectively avoid the wear problem of the friction surface, extend the service life of the blood pump and improve the blood pumping performance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the three-dimensional structure of the support frame;

[0013] Figure 2 This is a cross-sectional view of the support frame in Example 1;

[0014] Figure 3 This is a cross-sectional view of the support frame in Example 2;

[0015] Figure 4 This is a cross-sectional view of the support frame in Example 3;

[0016] Figure 5 This is a schematic diagram of the assembly structure of the support frame in the blood pump. Detailed Implementation

[0017] like Figure 1 , Figure 5 As shown, a distal support structure for a blood pump includes a support frame 10 comprising an outer ring 11 and an inner ring 12 arranged coaxially. The outer ring 11 and the inner ring 12 are fixedly connected by a connecting rod 13. The outer ring 11 is fixed to a blood cage 20. A ceramic sleeve 14 is provided in the inner cavity of the inner ring 12, and an impeller shaft 30 is inserted into the inner cavity of the ceramic sleeve 14 to form a support fit. The support frame 10 is located at the distal end of the blood cage 20 to support the distal end of the impeller shaft 30. To achieve the above purpose, the outer ring 11 and the inner ring 12 are connected by a connecting rod 13. The outer ring 11 is fixed to the blood cage 20 to fix the position of the entire support frame 10, and the inner ring 12 is used to support the impeller shaft 30. Blood flows into the inner cavity of the blood cage 20 from the area enclosed by the outer ring 11, the inner ring 12, and the connecting rod 13. Generally, the blood cage 20 is made of stainless steel. In order to ensure the reliability and strength requirements of the connection, the support frame 20 is also made of stainless steel. When the impeller shaft 30 rotates in the inner ring 12, it will wear out severely over a long period of time. Therefore, a ceramic sleeve 14 is embedded in the inner cavity of the inner ring 12. The ceramic sleeve 14 has extremely high hardness and wear resistance, which can effectively avoid the wear problem of the friction surface, extend the service life of the blood pump and improve the blood pumping performance.

[0018] Furthermore, the inner diameter of the inner ring 12 is configured to vary, including a large diameter section on the far side and a small diameter section on the near side, with a step between them. The ceramic sleeve 14 is inserted into the inner cavity of the large diameter section from the far end of the inner ring 12 and can be fixed by adhesive. The near end face of the ceramic sleeve 14 abuts against the step to form an axial limiting fit, and the far end face of the ceramic sleeve 14 is flush with the far end face of the inner ring 12. Example 1

[0019] like Figure 2 As shown, the inner diameter of the ceramic sleeve 14 is equal to the inner diameter of the small diameter section, and the connection surface transitions smoothly. In this embodiment, the inner diameter of the sleeve formed by the ceramic sleeve 14 and the inner ring 12 is equal, and they can be viewed as a whole. Example 2

[0020] like Figure 3 As shown, the inner diameter of the ceramic sleeve 14 is smaller than the inner diameter of the small diameter section. In this embodiment, the inner diameter of the small diameter section is slightly larger to facilitate the assembly of the impeller shaft 30. Example 3

[0021] like Figure 4 As shown, the inner diameter of the large-diameter section is a tapered hole that gradually increases from near to far, and the inner diameter of the ceramic sleeve 14 is equal to the diameter of the far side of the tapered hole. Similar to Embodiment 2, the tapered hole facilitates the assembly of the impeller shaft 30 and also serves as a guide.

[0022] To ensure wear resistance, the axial length of the ceramic sleeve 14 is greater than half the axial length of the inner ring 12.

[0023] Furthermore, in order to securely connect with the blood cage 20, the outer ring 11 is configured with a variable outer diameter, including a large diameter section on the distal side and a small diameter section on the proximal side, forming a step between them. The small diameter section is inserted into the inner cavity of the blood cage 20 and fits tightly against the inner wall of the blood cage. The step abuts against the distal end face of the blood cage 20. The outer diameter of the large diameter section is equal to the outer diameter of the blood cage 20, and the connection surface is smoothly transitioned, reducing damage to blood vessels, the heart, and blood.

[0024] The embodiments described above are merely some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A distal support structure for a blood pump, characterized by: Support frame (10) including coaxial arrangement of outer ring (11) and inner ring (12), outer ring (11) and inner ring (12) are fixedly connected by connecting rod (13), outer ring (11) is fixed with blood cage (20), characterized by: the inner cavity of the inner ring (12) is provided with a ceramic sleeve (14), the impeller shaft (30) is inserted into the inner cavity of the ceramic sleeve (14) and constitutes a bearing fit.

2. The distal support structure of a blood pump of claim 1, wherein: The inner diameter of the inner ring (12) is variable, including a large diameter section at the distal end and a small diameter section at the proximal end, forming a step between the two, the ceramic sleeve (14) is inserted into the inner cavity of the large diameter section from the distal end of the inner ring (12), and the proximal end face of the ceramic sleeve (14) abuts against the step to form an axial limiting fit, and the distal end face of the ceramic sleeve (14) is flush with the distal end face of the inner ring (12).

3. The distal support structure of a blood pump of claim 2, wherein: The inner diameter of the ceramic sleeve (14) is equal to the inner diameter of the small diameter section, and the interface is smoothly transitioned.

4. The distal support structure of a blood pump of claim 2, wherein: The inner diameter of the ceramic sleeve (14) is smaller than the inner diameter of the small diameter section.

5. The distal support structure of a blood pump of claim 2, wherein: The inner diameter of the large diameter section is a tapered hole that gradually increases from the proximal end to the distal end, and the inner diameter of the ceramic sleeve (14) is equal to the hole diameter at the distal end of the tapered hole.

6. The distal support structure of a blood pump of claim 2, wherein: The axial length of the ceramic sleeve (14) is greater than 1 / 2 of the axial length of the inner ring (12).

7. The distal support structure of a blood pump of claim 1, wherein: The outer diameter of the outer ring (11) is variable, including a large diameter section at the distal end and a small diameter section at the proximal end, forming a step between the two, the small diameter section is inserted into the inner cavity of the blood cage (20) and tightly adheres to the inner wall of the blood cage, the step abuts against the distal end face of the blood cage (20), the outer diameter of the large diameter section is equal to the outer diameter of the blood cage (20), and the interface is smoothly transitioned.

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