Driven magnet rapid installation device for centrifugal blood pump and centrifugal blood pump

Abstract

The utility model discloses a driven magnet rapid installation device for a centrifugal blood pump and the centrifugal blood pump, and relates to the technical field of ECMO centrifugal blood pump installation design. The driven magnet rapid installation device comprises a magnet installation ring and an impeller base, and a plurality of magnet installation faces are evenly arranged on the outer circumferential face of the magnet installation ring; the plurality of driven magnets are respectively adsorbed on the magnet mounting surfaces in a one-to-one correspondence manner; the impeller base is arranged in a centrifugal blood pump shell of the centrifugal blood pump, and a plurality of clamping grooves are evenly formed in the impeller base in the circumferential direction. The magnet mounting ring and the driven magnets adsorbed on the magnet mounting ring are mounted in the impeller base in a matched mode, and the driven magnets are embedded into the corresponding clamping grooves in a one-to-one mode. According to the utility model, the designed magnet mounting ring and the driven magnet adsorbed on the magnet mounting ring are directly arranged on the impeller base in a matching manner, so that the mounting can be quickly completed, the assembly efficiency is improved, the accurate mounting of the position of the driven magnet and the fixation of the axial and radial positions are ensured, and the normal and safe centrifugal operation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of ECMO centrifugal blood pump installation design, and in particular to a driven magnet quick installation device for a centrifugal blood pump and a centrifugal blood pump. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Extracorporeal membrane oxygenation (ECMO) provides patients with continuous extracorporeal oxygenation and circulatory support, giving medical staff more time to treat patients. The power pump is an important part of ECMO, used to provide power to drive blood to flow in the pipeline. Currently, centrifugal blood pumps are mainly used clinically. In order to further reduce blood damage, the centrifugal blood pumps often use magnetic coupling drive.

[0004] In the existing magnetic coupling driven centrifugal blood pump, the driven magnets in the pump are usually fixed to the set position on the impeller base by strong glue. However, this method of fixing with strong glue has the risk of the driven magnets failing to stick and moving under the centrifugal force of high-speed operation, thereby causing the internal magnetic ring group to burst. Once this happens, the centrifugal blood pump will be unusable. For this reason, another fixing method for the driven magnets has been proposed. For example, patent CN204669117U discloses a driving magnetic fixing assembly and a magnetic pump thereof, which fixes the driven magnets by setting a slot.

[0005] However, in order to facilitate manufacturing and reduce costs, the driven magnets currently used in centrifugal blood pumps are usually rectangular in shape. The slot fixing design scheme for matching the magnet shape proposed in the above patent cannot completely fasten the rectangular driven magnet, that is: when the rectangular driven magnet is placed in the slot of the impeller base, the circumferential and axial positions can be limited by the slot, but the radial position of the magnet cannot be limited, and the magnet will still move in the slot. In order to ensure the accuracy of the gap between the magnet and the driving magnet and ensure the normal and safe centrifugation, it is still necessary to determine the radial position of the driven magnet and fix it with strong glue, that is, there is still the problem of unstable rotation of the impeller due to loose adhesion or inaccurate position, and because the impeller is in contact with blood, in order to have biocompatibility, it is necessary to use non-toxic glue, which is relatively expensive. In addition, another method of fixing with bolts makes the assembly of the driven magnet very complicated and cumbersome. Utility Model Content

[0006] In view of the above-mentioned problems and defects existing in the prior art, the utility model provides a driven magnet quick installation device for a centrifugal blood pump and a centrifugal blood pump. By designing a magnet mounting ring, the driven magnet is firmly adsorbed on the magnet mounting ring. The magnet mounting ring and the driven magnet adsorbed thereon are directly matched and placed on the impeller base, so that the installation can be completed quickly and the assembly efficiency is improved. The magnet mounting ring and the impeller base slot jointly ensure the accurate installation of the driven magnet and the fixation of the axial and radial positions, thereby ensuring the normal and safe operation of the centrifuge.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A driven magnet quick mounting device for a centrifugal blood pump, comprising a magnet mounting ring and an impeller base;

[0009] A plurality of magnet mounting surfaces are evenly arranged on the outer circumferential surface of the magnet mounting ring, and a plurality of driven magnets are adsorbed on the magnet mounting surfaces one by one; the impeller base is arranged in a centrifugal blood pump housing of the centrifugal blood pump, and a plurality of slots are evenly arranged in the impeller base along the circumferential direction;

[0010] The magnet mounting ring and the driven magnets adsorbed thereon are matched and mounted in the impeller base, and each driven magnet is embedded in a corresponding slot one by one.

[0011] According to a further technical solution, the magnet mounting surface matches the driven magnet, the magnet mounting surface is a shallow groove structure, and the groove surface of the shallow groove structure is a plane, and the driven magnet is embedded in the shallow groove structure and adsorbed on the magnet mounting surface.

[0012] According to a further technical solution, each driven magnet is in the shape of an elongated cube, and each driven magnet is identical.

[0013] According to a further technical solution, the groove depth of the shallow groove structure is equal to the difference between the width of the driven magnet and the width of the clamping groove.

[0014] According to a further technical solution, the magnet mounting surface is an isosceles trapezoidal plane or a rectangular plane.

[0015] A further technical solution is that the centrifugal blood pump includes a centrifugal blood pump housing, which is rotatably connected to a driving motor. An impeller base is provided in the centrifugal blood pump housing, and a protrusion is provided in the middle of the bottom of the impeller base. The protrusion is placed in the bottom center recess of the centrifugal blood pump housing for single-point support.

[0016] According to a further technical solution, a plurality of driving magnets are evenly embedded on the driving motor along the circumferential direction, and the driving magnets and the driven magnets embedded in the impeller base attract each other.

[0017] According to a further technical solution, the magnet mounting ring is made of an integrated material of iron, nickel, cobalt and their alloys.

[0018] According to a further technical solution, a circular groove is provided on the impeller base, a plurality of slots are evenly arranged on the outer circumference of the circular groove, and the circular groove matches the magnet mounting ring.

[0019] The utility model also provides a centrifugal blood pump, which is installed by using the centrifugal blood pump driven magnet quick installation device as described above.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The utility model provides a device for quickly installing a driven magnet for a centrifugal blood pump and a centrifugal blood pump. By designing a magnet mounting ring, a corresponding magnet mounting surface is precisely machined on the magnet mounting ring according to the spatial position of the driven magnet when it is installed. During installation, the driven magnet is firmly adsorbed on the magnet mounting surface of the magnet mounting ring, and then the magnet mounting ring and the driven magnet adsorbed thereon are directly matched and placed on the impeller base, thereby completing the quick installation of the driven magnet and improving the assembly efficiency.

[0022] 2. The utility model fixes the driven magnet by the magnet mounting ring provided with the magnet mounting surface and the impeller base slot, thereby ensuring the accurate installation of the driven magnet and the axial and radial position fixation, thereby ensuring the normal and safe operation of centrifugation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0024] Figure 1 It is a structural schematic diagram of a driven magnet quick installation device for a centrifugal blood pump in the utility model;

[0025] Figure 2 It is a schematic diagram of the principle of the centrifugal blood pump in the utility model;

[0026] Figure 3 It is a schematic diagram of the structure of the impeller base and the driven magnet embedded in the slot in the utility model;

[0027] Figure 4 It is a structural schematic diagram of the magnet mounting ring in the utility model;

[0028] Figure 5 It is a schematic structural diagram of a magnet mounting ring and a driven magnet adsorbed thereon in the utility model.

[0029] Among them, 1. centrifugal blood pump; 101. centrifugal blood pump housing; 102. impeller assembly; 103. driven magnet; 2. driving motor; 201. driving magnet; 3. magnet mounting ring; 4. magnet mounting surface; 5. annular groove; 6. card slot. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] Embodiment 1

[0033] The working principle of a centrifugal blood pump is Figure 2 As shown, the centrifugal blood pump 1 comprises a centrifugal blood pump housing 101 (PC material), in which an impeller assembly 102 (PC material) and a plurality of driven magnets 103 (NdFeB material) are arranged. The impeller assembly comprises an impeller and an impeller base that are fixedly connected. The plurality of driven magnets 103 in the pump are in the shape of long cubes and are embedded in the impeller base. They are evenly distributed on the same diameter centered on the central axis of rotation of the impeller assembly 102, as shown in FIG. Figure 3 As shown, the centrifugal blood pump housing 101 wraps the entire impeller assembly therein to form a complete blood pump. In the centrifugal blood pump 1, the impeller assembly 102 is placed in the centrifugal blood pump housing 101, and there is a gap between the impeller assembly 102 and the centrifugal blood pump housing 101. A protrusion is provided in the middle of the bottom of the impeller base in the impeller assembly 102, and the protrusion is placed at the center of the bottom of the centrifugal blood pump housing for single-point support.

[0034] Furthermore, the centrifugal blood pump 1 is placed on the driving motor 2, that is, the centrifugal blood pump housing is connected to the driving motor in rotation, and the driving magnet 201 embedded in the driving motor 2 and the driven magnet 103 embedded in the impeller base attract each other, and then the impeller assembly 102 is tightly pressed to the bottom of the centrifugal blood pump housing 101 through a single point support, and at the same time, the impeller assembly 102 is suspended except for the contact with the centrifugal blood pump housing 101 through a single point support. There is a gap between the driving magnet 201 and the centrifugal blood pump housing 101, so as to realize the magnetic coupling drive of the centrifugal blood pump 1. Specifically, when the driving motor rotates, the driving motor shaft will drive the driving magnet 201 to rotate together, and the driving magnet 201 will drive the driven magnet 103 and the impeller assembly 102 formed as a whole with it to rotate through the effect of magnetic coupling; at this time, blood enters the blood pump through the centrifugal blood pump inlet, and is ejected to the volute flow channel under the rotation of the impeller, and finally flows out from the centrifugal blood pump outlet, so as to complete the centrifugation.

[0035] Considering that the slots provided on the impeller base cannot completely fasten the long cube-shaped driven magnet, that is, the driven magnet is placed in the slots of the impeller base, and its circumferential and axial positions can be limited by the slots, but the slots cannot limit the radial position of the driven magnet, and the magnet will still move in the slots. For example, when the centrifugal blood pump is moved, the magnet may be shaken and detach from the slots and move radially inward or change its position up and down. Using strong glue or bolts to fix will make the entire assembly process complicated and cumbersome. Therefore, if Figure 1 As shown, this embodiment discloses a driven magnet quick installation device for a centrifugal blood pump, the device comprises a magnet installation ring 3 and an impeller base, wherein the magnet installation ring 3 is as shown in FIG. Figure 4 As shown, a plurality of magnet mounting surfaces 4 are evenly arranged on the outer circumference thereof, and the magnet mounting surface on the magnet mounting ring is precisely machined according to the spatial position of the driven magnet when it is installed, and a plurality of driven magnets are adsorbed on the magnet mounting surface one by one, as shown in FIG. Figure 5 As shown; the impeller base is arranged in the centrifugal blood pump housing of the centrifugal blood pump, and a plurality of slots 6 are evenly arranged in the impeller base along the circumferential direction, the magnet mounting ring and the driven magnet adsorbed thereon are matched and mounted in the impeller base, and each driven magnet is respectively embedded in the corresponding slot. In this way, on the one hand, the magnet mounting ring can prevent the driven magnet from moving radially inward, and on the other hand, when the centrifugal blood pump rotates at a high speed, this radial position will change only when the centrifugal force of the inner magnet (i.e. the driven magnet) plus the attraction of the outer magnet (i.e. the driving magnet) to the inner magnet is greater than the attraction of the magnet mounting ring to the magnet, but this situation will not occur within the working speed range of the pump, that is, the magnet mounting ring can also effectively prevent the driven magnet from moving radially outward and changing its position.

[0036] Furthermore, each driven magnet 103 is in the shape of a long cube, and each driven magnet is the same, the magnet mounting surface 4 matches the driven magnet 103, the magnet mounting surface 4 is a shallow groove structure, and the groove surface of the shallow groove structure is a plane, and the driven magnet is embedded in the shallow groove structure and adsorbed on the magnet mounting surface. The material of the magnet mounting ring is made of iron, nickel, cobalt and their alloy materials, which can make the driven magnet fastened and adsorbed, and does not affect the magnetic attraction between the driven magnet and the driving magnet.

[0037] Preferably, the groove surface is an isosceles trapezoidal plane or a rectangular plane to facilitate the adsorption of the driven magnet. When it is an isosceles trapezoidal plane, the upper base and height of the isosceles trapezoid are equal to the length and height of the driven magnet; when it is a rectangle, the length and height of the rectangle are equal to the length and height of the driven magnet.

[0038] Furthermore, an annular groove 5 is provided on the impeller base, and a plurality of slots 6 are evenly arranged on the outer circumference of the annular groove 5. The annular groove 5 matches the magnet mounting ring 3, and the magnet mounting ring 3 and the driven magnet 103 adsorbed thereon can be directly matched and placed on the impeller base, the magnet mounting ring 3 is embedded in the annular groove 5, and the driven magnet 103 is embedded in the slot 6, so as to complete the rapid installation of the driven magnet. Preferably, the groove depth of the shallow groove structure is equal to the difference between the width of the driven magnet and the width of the slot, so as to adapt to the matching between the annular groove, the slot, the magnet mounting ring, and the driven magnet.

[0039] The specific working process of the utility model is as follows:

[0040] During installation, the driven magnets 103 are firmly adsorbed on the magnet mounting surfaces of the magnet mounting ring 3, and then the whole part is matched and placed on the impeller base, so that the magnet mounting ring 3 is embedded in the annular groove 5 of the impeller base, and the driven magnets 103 are embedded in the slots 6 of the impeller base, so that the installation of the driven magnets 103 can be completed. Through this assembly method, the magnet mounting ring and the impeller base slots jointly ensure the accurate installation and fixation of the driven magnets, ensuring the normal and safe operation of the centrifuge.

[0041] Embodiment 2

[0042] This embodiment provides a centrifugal blood pump, which is installed using the centrifugal blood pump driven magnet quick installation device as proposed in the first embodiment.

[0043] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A driven magnet quick installation device for a centrifugal blood pump, characterized in that: Includes magnet mounting ring and impeller base; A plurality of magnet mounting surfaces are evenly arranged on the outer circumferential surface of the magnet mounting ring, and a plurality of driven magnets are adsorbed on the magnet mounting surfaces one by one in correspondence; the impeller base is arranged in a centrifugal blood pump housing of the centrifugal blood pump, and a plurality of slots are evenly arranged in the impeller base along the circumferential direction; The magnet mounting ring and the driven magnets adsorbed thereon are matched and mounted in the impeller base, and each driven magnet is embedded in a corresponding slot one by one.

2. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 1, characterized in that: The magnet mounting surface matches the driven magnet, the magnet mounting surface is a shallow groove structure, and the groove surface of the shallow groove structure is a plane, and the driven magnet is embedded in the shallow groove structure and adsorbed on the magnet mounting surface.

3. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 1, characterized in that: Each driven magnet is in the shape of an elongated cube, and each driven magnet is identical.

4. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 2, characterized in that: The groove depth of the shallow groove structure is equal to the difference between the width of the driven magnet and the depth of the card groove.

5. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 2, characterized in that: The groove surface is an isosceles trapezoidal plane or a rectangular plane.

6. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 1, characterized in that: The centrifugal blood pump comprises a centrifugal blood pump housing, which is rotatably connected to a driving motor. An impeller base is arranged in the centrifugal blood pump housing, and a protrusion is arranged in the middle of the bottom of the impeller base. The protrusion is placed in the center recess of the bottom of the centrifugal blood pump housing for single-point support.

7. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 6, characterized in that: A plurality of driving magnets are evenly inlaid on the driving motor along the circumferential direction, and the driving magnets and the driven magnets embedded in the impeller base attract each other.

8. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 1, characterized in that: The impeller base is provided with an annular groove, and a plurality of clamping grooves are evenly arranged on the outer circumference of the annular groove, and the annular groove matches the magnet mounting ring.

9. A driven magnet quick installation device for a centrifugal blood pump as claimed in claim 1, characterized in that: The magnet mounting ring is made of iron, nickel, cobalt and their alloy materials in an integrated manner.

10. A centrifugal blood pump, characterized in that: The centrifugal blood pump is installed using the driven magnet quick installation device as described in any one of claims 1 to 9.

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