Driving magnet mounting structure for centrifugal blood pump and centrifugal blood pump

Abstract

The utility model discloses a driving magnet mounting structure for a centrifugal blood pump and the centrifugal blood pump, and belongs to the technical field of medical instruments. Comprising a driving disc, a pump supporting seat and a driving magnet, the driving disc is arranged in the pump supporting seat, and the driving disc and the pump supporting seat are coaxially arranged; a containing groove is formed in the middle of the driving disc, and a motor shaft through hole is formed in the center of the containing groove; magnet mounting grooves which are uniformly distributed in the circumferential direction of the driving disc are formed in the driving disc; the inner side wall of the magnet mounting groove is of a step structure, a containing space is formed between the upper portion of the step structure and the driving magnet, and adhesive glue is placed in the containing space; and the width of the bottom surface of the magnet mounting groove is matched with that of the driving magnet. And through the arrangement of the bonding glue and the limiting protrusions, installation of the driving magnets is more stable, and the problem that the driving magnets are prone to flying out in the high-speed rotation process of the driving disc is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an active magnet mounting structure 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) devices are mainly used in clinical practice to support cardiac insufficiency and / or respiratory insufficiency, and are a key technology for the treatment of severe heart failure and respiratory failure. Currently, ECMO circulatory support is becoming more and more common, and the use of ECMO devices to provide circulatory support for patients with severe cardiopulmonary failure has achieved good results.

[0004] The power pump is one of the important components of ECMO equipment. It is used to provide power to drive blood to flow in the pipeline. In clinical practice, magnetic coupling-driven centrifugal pumps are mainly used, and the driving magnets are fixed to the driving turntable through the mounting groove. However, the speed of the driving turntable during the power pump driving process is too high, and there is a risk of the driving magnet shifting or flying out at high speed, affecting the normal use of the centrifugal blood pump; at the same time, if there is a large error in the installation position of the magnet, it will also affect the operation of the centrifugal blood pump. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide an active magnet mounting structure for a centrifugal blood pump and a centrifugal blood pump, in which the driving magnet is fixed to the mounting slot of the driving disk by adhesive and a slot to ensure the accuracy of the mounting position of the driving magnet, and the centrifugal force of the driving magnet during high-speed rotation is borne by the mounting slot to prevent the driving magnet from shifting or flying out.

[0006] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] An active magnet mounting structure for a centrifugal blood pump comprises a driving disc, a pump support seat and a driving magnet, wherein the driving disc is arranged inside the pump support seat, and the driving disc and the pump support seat are coaxially arranged;

[0008] A receiving groove is provided in the middle of the driving disk, the receiving groove has a receiving space at the bottom of the centrifugal blood pump, and a motor shaft through hole is provided at the center of the receiving groove; a plurality of magnet mounting grooves are provided on the driving disk, the magnet mounting grooves are evenly distributed along the circumference of the driving disk, and are located between the driving disk and the receiving groove;

[0009] The inner side wall of the magnet mounting groove is a step structure, and there is a receiving space between the upper part of the step structure and the driving magnet, and adhesive is placed in the receiving space; the bottom width of the magnet mounting groove matches the width of the driving magnet.

[0010] By adopting the above technical solution, the driving magnet is installed in the installation groove. The installation groove is accurately machined to ensure the accuracy of the installation position of the driving magnet. At the same time, a storage space for adhesive is provided in the installation groove, which can improve the stability of the installation of the driving magnet.

[0011] In some embodiments, an impeller base is provided in the centrifugal blood pump, and the impeller base is located at the bottom of the centrifugal blood pump;

[0012] The impeller base is coaxially arranged with the driving disk, and a plurality of passive magnets are arranged on the impeller base, and the plurality of passive magnets are evenly distributed along the circumference of the impeller base;

[0013] The driving magnet and the passive magnet are arranged opposite to each other, and the installation angles of the driving magnet and the passive magnet are consistent. The installation height of the driving magnet is lower than the installation height of the passive magnet.

[0014] By adopting the above technical solution, the pulling force generated between the driving magnet and the passive magnet causes the middle part of the impeller to be pressed against the bottom of the centrifugal blood pump through a single-point support.

[0015] In some embodiments, the driving magnet is a cubic structure, and the height of the driving magnet is equal to the height of the receiving groove.

[0016] By adopting the above technical solution, the cubic structure of the driving magnet is easy to process, and the height of the driving magnet is equal to the height of the accommodating groove, so that the driving disk and the driving magnet are basically on the same plane, preventing wind caused by uneven surface and improving energy transfer efficiency.

[0017] In some embodiments, a connecting seat is provided at the bottom of the driving disk, and the motor shaft through hole passes through the connecting seat.

[0018] By adopting the above technical solution, the contact area between the drive disc and the motor output shaft is increased, making the connection between them more stable.

[0019] In some embodiments, the driving plate is made of aluminum alloy, and the driving magnet is made of neodymium iron boron material.

[0020] By adopting the above technical solution, the strength of the driving disk is guaranteed, and the driving magnet made of NdFeB material has strong magnetic force.

[0021] In some embodiments, a driving motor is further included, and the driving motor is disposed at the bottom of the pump support seat. The output shaft of the driving motor passes through the pump support seat and is connected to the driving disk through the motor shaft through hole.

[0022] By adopting the above technical solution, the driving motor starts to drive the driving disk to rotate, and the driving magnet mounted on the driving disk rotates together. The driving magnet drives the passive magnet and the impeller forming an integral part thereof to rotate through the effect of magnetic coupling, thereby realizing the magnetic coupling drive of the centrifugal blood pump.

[0023] In some embodiments, the centrifugal blood pump includes a pump housing, which is hollow; an impeller and an impeller base are arranged in sequence from top to bottom inside the pump housing, and the impeller base is coaxial with the impeller.

[0024] By adopting the above technical solution, under the drive of magnetic coupling, the blood is accelerated between the impeller blades to form a high-speed rotating vortex.

[0025] In some embodiments, the pump housing and the impeller are both made of PC material.

[0026] By adopting the above technical solution, the mass of the pump casing and the impeller can be significantly reduced, while having good strength and toughness.

[0027] In some embodiments, a supporting protrusion is provided at the bottom of the impeller base, the supporting protrusion is located at the center of the impeller base, and the bottom surface of the supporting protrusion abuts against the bottom surface of the pump housing.

[0028] By adopting the above technical solution, the impeller assembly consisting of the impeller and the impeller base is supported at the bottom of the pump housing only by a single point of the support protrusion, and the rest of the parts are suspended in the air, thereby realizing the rotation of the impeller assembly.

[0029] The embodiment of the utility model further provides a centrifugal blood pump, comprising the above-mentioned active magnet mounting structure for the centrifugal blood pump.

[0030] The technical solution provided by the utility model has at least the following technical effects or advantages:

[0031] 1. The technical solution provided by the utility model, through the design of the driving disk, uses adhesive to firmly fix the driving magnet on the driving disk, thereby reducing the probability of the driving magnet shifting or flying out during the high-speed operation of the driving disk, thereby ensuring the normal operation of the centrifugal blood pump.

[0032] 2. The technical solution provided by the utility model can ensure the accuracy of the installation position of the driving magnet by designing the position of the magnet installation groove, and the driving magnet and the driving disk are in the same plane, preventing the driving disk from being uneven and causing the driving disk to spin during rotation, affecting the energy transfer efficiency.

[0033] 3. The technical solution provided by the utility model is that the driving disk is made of aluminum alloy, so that the magnet mounting groove has a metal outer wall, and the magnet mounting groove can withstand the centrifugal force of the driving magnet during high-speed rotation, thereby preventing the driving magnet from shifting or flying out. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 This is a schematic diagram of the installation structure of the active magnet installation structure for the centrifugal blood pump provided by the embodiment of the utility model;

[0036] Figure 2 It is a schematic diagram of the installation structure of the driving magnet provided in the embodiment of the utility model;

[0037] Figure 3 It is a schematic diagram of the structure of the drive disk provided by the embodiment of the utility model;

[0038] Figure 4 It is a schematic diagram of the structure of the installation slot provided by the embodiment of the utility model;

[0039] In the figure: 1. centrifugal blood pump; 101. pump housing; 102. impeller assembly; 103. passive magnet; 2. pump support base; 3. driving magnet; 4. driving disk; 5. driving motor; 6. magnet mounting slot.

[0040] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0041] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0042] Embodiment 1

[0043] Combination Figure 1-Figure 4 The working principle of the centrifugal blood pump 1 is as follows Figure 1As shown, the centrifugal blood pump 1 includes a pump housing 101, which is hollow. An impeller assembly 102 consisting of an impeller and an impeller base is sequentially installed inside the pump housing 101 from top to bottom. The impeller and the impeller base are coaxially arranged along the center of the pump housing 101, and the impeller and the impeller base are an integrated structure; a plurality of passive magnets 103 are embedded in the impeller base, and the plurality of passive magnets 103 are evenly distributed along the circumference of the impeller base; the impeller base is placed in the central recess at the bottom of the pump housing 101, and a supporting protrusion is connected to the bottom of the impeller base, and the supporting protrusion is located at the center of the impeller base. The bottom surface of the supporting protrusion abuts against the bottom surface of the pump housing 101, forming a single-point support between the impeller base and the pump housing 101. Except for the contact with the pump housing 101 through the single-point support here, the rest of the impeller assembly 102 is suspended, and there is a certain gap between the impeller assembly 102 and the pump housing 101.

[0044] In order to realize the driving of the centrifugal blood pump 1, it is necessary to drive the centrifugal blood pump 1 through magnetic coupling with the driving magnet 3, the passive magnet 103 and the driving motor 5. However, most of the existing driving magnets 3 are directly fixed in the mounting groove, and the driving magnets 3 cannot be well fastened during the high-speed rotation in the driving process.

[0045] Therefore, the present embodiment provides an active magnet installation structure for a centrifugal blood pump 1, including a drive disk 4, a pump support seat 2 and a drive magnet 3. The pump support seat 2 is a hollow structure with an opening at the top. The drive disk 4 is installed inside the pump support seat 2, and the drive disk 4 and the pump support seat 2 are coaxially arranged. A receiving groove is provided in the middle of the drive disk 4, and the receiving groove has a receiving space at the bottom of the centrifugal blood pump 1. The centrifugal blood pump 1 is placed in the pump support seat 2 and mounted on the receiving groove. The receiving groove surrounds the bottom of the centrifugal blood pump 1 and has a certain gap with the bottom of the centrifugal blood pump 1. A motor shaft through hole is provided at the center of the receiving groove. A drive motor 5 is installed at the bottom of the pump support seat 2. The output shaft of the drive motor 5 passes through the pump support seat 2 and is connected to the drive disk 4 through the motor shaft through hole.

[0046] A plurality of magnet mounting grooves 6 are provided on the driving disk 4, and the magnet mounting grooves 6 are evenly distributed along the circumference of the driving disk 4 and are located between the edge of the driving disk 4 and the accommodating groove. One end of the magnet mounting groove 6 is set as an opening, and the other inner side walls of the magnet mounting groove 6 are all step structures, and the step structure includes an upper step and a lower step arranged up and down along the height direction of the magnet mounting groove 6, and there is a accommodating space between the upper step and the driving magnet 3, and an adhesive is placed in the accommodating space. The spacing between the two lower steps arranged opposite to each other on both sides of the magnet mounting groove 6 is consistent with the size of the driving magnet 3, so that the driving magnet 3 forms a tight fit after being placed in the magnet mounting groove 6. At the same time, the driving magnet 3 abuts against the lower step at the other end of the magnet mounting groove 6, and the accurate installation position of the magnet is ensured by relying on the lower step with precise size in the magnet mounting groove. At the same time, the driving magnet 3 is fastened by the fixing effect of the adhesive to improve its installation stability and ensure the normal operation of the centrifugal blood pump 1.

[0047] The step structure at the other end of the magnet mounting slot 6 is located in the middle of the inner wall, and its side is a groove structure, which can also be used to place adhesive to further enhance the fastness of the driving magnet 3.

[0048] The number of driving magnets 3 and passive magnets 103 is equal and their polarities are opposite. Any driving magnet 3 is arranged opposite to the corresponding passive magnet 103, and the installation angles of the driving magnet 3 and the passive magnet 103 are consistent. The installation height of the driving magnet 3 is slightly lower than that of the passive magnet 103. The attraction generated by the driving magnet 3 and the passive magnet 103 makes the impeller assembly 102 pressed against the bottom of the pump housing 101 through a single point support.

[0049] As an implementation method, in order to increase the contact area between the drive disk 4 and the motor output shaft, a connecting seat is connected to the bottom of the drive disk 4, and the motor shaft through hole passes through the connecting seat. The output shaft of the drive motor 5 is connected to the connecting seat and the drive disk 4 via the motor shaft through hole, thereby improving the stability of the connection between the drive disk 4 and the drive motor 5.

[0050] In this embodiment, the number of driving magnets 3 and passive magnets 103 are both 6, the driving disk 4 is made of non-magnetic material-aluminum alloy, the driving magnet 3 is made of neodymium iron boron material and has a cubic structure, and the pump housing 101 and impeller assembly 102 are made of PC material.

[0051] The working method of this embodiment is as follows:

[0052] During installation, the driving magnet 3 is placed in the magnet mounting groove 6 through the opening, and adhesive is placed in the accommodation space and the gap between the driving magnet 3 and the magnet mounting groove 6, so that after the adhesive is cured, the driving magnet 3 and the magnet mounting groove 6 are further fixed. The driving disk 4 and the centrifugal blood pump 1 are placed in the pump support seat 2 in sequence, and the output shaft of the driving motor 5 passes through the pump support seat 2 and is connected to the driving disk 4 through the motor shaft through hole.

[0053] When in use, the driving motor 5 works, the output shaft rotates to drive the driving disk 4, and the driving magnet 3 mounted on the driving disk 4 rotates together. The driving large magnet drives the passive magnet 103 and the impeller assembly 102 integral therewith to rotate through the effect of magnetic coupling.

[0054] The impeller assembly 102 rotates at high speed, forcing the blood to rotate faster between the impeller blades, forming a high-speed rotating vortex. This rotational motion generates centrifugal force in the fluid, causing the blood to be thrown toward the outer edge of the impeller under the action of the centrifugal force, and enter the discharge pipeline along the flow channel of the pump housing 101, and finally flow out from the blood pump outlet. In this process, the kinetic energy and static pressure of the blood increase, thereby achieving blood transportation.

[0055] Embodiment 2

[0056] Based on the above-mentioned active magnet mounting structure for the centrifugal blood pump 1, the present embodiment further provides a centrifugal blood pump 1, the bottom of the centrifugal blood pump 1 is provided with the active magnet mounting structure for the centrifugal blood pump 1 described in the above-mentioned embodiment, the centrifugal blood pump 1 is arranged inside the pump support seat 2, and the bottom of the centrifugal blood pump 1 is located in the accommodating groove. Since the above-mentioned active magnet mounting structure has the above-mentioned technical effects, please refer to the above-mentioned embodiment for the technical effects of the centrifugal blood pump 1 adopting the active magnet mounting structure.

[0057] 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. An active magnet mounting structure for a centrifugal blood pump, characterized in that: It includes a driving disc, a pump support seat and a driving magnet, wherein the driving disc is arranged inside the pump support seat, and the driving disc and the pump support seat are coaxially arranged; A receiving groove is provided in the middle of the driving disk, the receiving groove has a receiving space at the bottom of the centrifugal blood pump, and a motor shaft through hole is provided at the center of the receiving groove; a plurality of magnet mounting grooves are provided on the driving disk, the magnet mounting grooves are evenly distributed along the circumference of the driving disk, and are located between the driving disk and the receiving groove; The inner side wall of the magnet mounting groove is a step structure, and there is a receiving space between the upper part of the step structure and the driving magnet, and adhesive is placed in the receiving space; the bottom width of the magnet mounting groove matches the width of the driving magnet.

2. The active magnet mounting structure for a centrifugal blood pump according to claim 1, characterized in that: An impeller base is provided in the centrifugal blood pump, and the impeller base is located at the bottom of the centrifugal blood pump; The impeller base is coaxially arranged with the driving disk, and a plurality of passive magnets are arranged on the impeller base, and the plurality of passive magnets are evenly distributed along the circumference of the impeller base; The driving magnet and the passive magnet are arranged opposite to each other, and the installation angles of the driving magnet and the passive magnet are consistent.

3. The active magnet mounting structure for a centrifugal blood pump according to claim 1, characterized in that: The driving magnet is a cubic structure, and the height of the driving magnet is equal to the height of the accommodating groove.

4. The active magnet mounting structure for a centrifugal blood pump according to claim 1, characterized in that: A connecting seat is arranged at the bottom of the driving disk, and the motor shaft through hole passes through the connecting seat.

5. The active magnet mounting structure for a centrifugal blood pump according to claim 1, characterized in that: The driving disk is made of aluminum alloy, and the driving magnet is made of neodymium iron boron material.

6. The active magnet mounting structure for a centrifugal blood pump according to claim 1, characterized in that: It also includes a driving motor, which is arranged at the bottom of the pump support seat. The output shaft of the driving motor passes through the pump support seat and is connected to the driving disk through the motor shaft through hole.

7. The active magnet mounting structure for a centrifugal blood pump according to claim 1, characterized in that: The centrifugal blood pump comprises a pump casing, which is hollow; an impeller and an impeller base are arranged in sequence from top to bottom inside the pump casing, and the impeller base and the impeller are coaxially arranged.

8. The active magnet mounting structure for a centrifugal blood pump according to claim 7, characterized in that: The pump housing and the impeller are both made of PC material.

9. The active magnet mounting structure for a centrifugal blood pump according to claim 7, characterized in that: A supporting protrusion is arranged at the bottom of the impeller base, and the supporting protrusion is located at the center of the impeller base. The bottom surface of the supporting protrusion abuts against the bottom surface of the pump housing.

10. A centrifugal blood pump, characterized in that: The invention comprises the active magnet mounting structure for a centrifugal blood pump as described in any one of claims 1 to 9.

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