Driving device and blood pump

Abstract

The utility model relates to a driving device and a blood pump. The driving device comprises a shell, a stator, a rotating assembly and a balancing assembly. The rotating assembly comprises a rotating shaft and a rotor, the rotating shaft is rotatably arranged on the shell, and the rotor is fixedly connected with the rotating shaft; the stator is fixedly connected with the shell and generates a first attraction force on the rotor along the axial direction of the rotating shaft; the balance assembly, the rotor and the stator are arranged in the axial direction of the rotating shaft, the rotor is located between the stator and the balance assembly, the balance assembly comprises a first magnet and a second magnet, the first magnet is fixedly connected with the rotating shaft, the second magnet is fixedly connected with the shell and applies a second attraction force to the first magnet, and the direction of the second attraction force is opposite to that of the first attraction force. According to the driving device, the complexity of the structure and the manufacturing difficulty of the driving device can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a driving device and a blood pump. Background Art

[0002] A blood pump is a mechanical circulation device that is inserted percutaneously into the patient's body to assist the heart in completing the function of pumping blood. The drive device, as one of the components of the blood pump, mainly provides power for the blood pump. Two rotors are usually arranged in the drive device. The two rotors are located on both sides of the axial direction of the stator. The two ends of the stator respectively generate attractive forces in opposite directions on the two rotors, so that the rotating shaft remains balanced in the axial direction under the action of the two attractive forces, so that it does not move in the axial direction. The rotor of this drive device usually has a Halbach array magnetic ring composed of a plurality of fan-shaped magnetic blocks, and the two adjacent magnetic blocks are fixed by bonding. However, there is a large repulsive force and rotational torque between the two adjacent magnetic blocks of the rotor, which makes the bonding of the rotor difficult and difficult to manufacture, increasing the complexity of the structure of the drive device and the difficulty of manufacturing. Utility Model Content

[0003] Based on this, it is necessary to provide a driving device and a blood pump to address the above technical problems, aiming to reduce the complexity of the driving device structure and the difficulty of manufacturing.

[0004] The driving device of the present application includes a shell, a rotating component, a stator and a balancing component; wherein the rotating component includes a rotating shaft and a rotor, the rotating shaft is rotatably arranged on the shell, and the rotor is fixedly connected to the rotating shaft; the stator is fixedly connected to the shell, and the stator generates a first attraction force on the rotor along the axial direction of the rotating shaft; the balancing component, the rotor and the stator are arranged along the axial direction of the rotating shaft, and the rotor is located between the stator and the balancing component, and the balancing component includes a first magnet and a second magnet, the first magnet is fixedly connected to the rotating shaft, the second magnet is fixedly connected to the shell, and the second magnet generates a second attraction force on the first magnet, and the second attraction force is opposite to the direction of the first attraction force.

[0005] In one embodiment, the rotating shaft has a connecting end located outside the driving device; the shell has a proximal end, a distal end adjacent to the connecting end, and a accommodating cavity located between the proximal end and the distal end; the stator and the rotor are both arranged in the accommodating cavity, and the second magnet is arranged at the distal end.

[0006] In one embodiment, a thrust ring is disposed on the outer circumferential surface of the rotating shaft, and the thrust ring is disposed between the rotor and the second magnet; and the first magnet is disposed on the thrust ring.

[0007] In one embodiment, the thrust ring has a circumferential surface; the first magnet is arranged on the circumferential surface of the thrust ring and is located between the second magnet and the rotor; wherein the first magnet has a first end facing the second magnet, the second magnet has a second end opposite to the first end, and the magnetic pole of the second end is opposite to the magnetic pole of the first end.

[0008] In one embodiment, the second magnet has an axial hole inside for the rotating shaft to pass through; the thrust ring has a distal surface facing away from the rotor, and the first magnet is arranged on the distal surface of the thrust ring and is at least partially accommodated in the axial hole; wherein, the first magnet has a first end facing the rotor, the second magnet has a second end facing the rotor, and the magnetic pole of the second end is opposite to the magnetic pole of the first end.

[0009] In one embodiment, the first magnet further has a third end away from the rotor, the third end extends into the shaft hole, and the first end is located outside the shaft hole; or, the first end is located in the shaft hole, and the third end is located outside the shaft hole.

[0010] In one embodiment, the diameter of the distal end of the shell gradually decreases in the direction from the stator to the rotor, so that the distal end is truncated into a cone shape, and a mounting cavity is provided at the large diameter end of the distal end, and the second magnet is embedded in the mounting cavity.

[0011] In one embodiment, the driving device further includes a fixed seat and a first sleeve, wherein the fixed seat is disposed in the proximal end portion of the shell, and the fixed seat has a first surface facing the stator; the first sleeve is installed on the fixed seat for rotatable installation of the rotating shaft, and the first sleeve has a second surface facing the stator; wherein at least one of the first surface and the second surface is against the stator.

[0012] In one embodiment, the driving device further includes at least one of the following four features:

[0013] The first attraction is equal to the second attraction;

[0014] The first magnet is a ring-shaped magnet and is arranged around the rotating shaft;

[0015] The second magnet is a ring-shaped magnet;

[0016] The rotor includes a plurality of magnetic blocks, and the plurality of magnetic blocks are arranged into a Halbach array magnetic ring.

[0017] The present application also provides a blood pump, which includes a pump casing, an impeller and a driving device; wherein the driving device refers to any one of the above-mentioned embodiments; the pump casing is fixedly connected to the distal end of the shell of the driving device, and the pump casing has a blood flow channel; the impeller is rotatably arranged in the blood flow channel; the driving device is fixedly connected to the pump casing, and the rotating shaft portion of the driving device is located in the blood flow channel to be fixedly connected to the impeller.

[0018] The above-mentioned drive device and blood pump, by arranging a second magnet in the shell and a first magnet on the rotating shaft, can use the second magnet to generate a second attractive force on the first magnet. The direction of the second attractive force is opposite to the direction of the first attractive force generated by the stator on the rotor, so that the second attractive force can at least partially offset the first attractive force to balance the axial force exerted on the rotating shaft. In this way, there is no need to arrange rotors with Halbach array magnetic rings on both axial sides of the stator to maintain the force balance of the rotating shaft, thereby reducing the number of rotors and reducing the structural complexity and manufacturing difficulty of the drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A longitudinal cross-sectional view of a driving device provided in one embodiment of the present application.

[0020] Figure 2 A longitudinal cross-sectional view of a driving device provided in another embodiment of the present application.

[0021] Figure 3 A longitudinal cross-sectional view of a driving device provided in another embodiment of the present application.

[0022] Figure 4 for Figures 1 to 3 A schematic diagram of the three-dimensional structure of a rotor of a driving device is provided.

[0023] Figure 5 for Figures 1 to 3 A schematic diagram of the three-dimensional structure of the second magnet of the driving device is provided.

[0024] Figure 6 for Figures 1 to 3 A schematic diagram of the three-dimensional structure of a first magnet of a driving device is provided.

[0025] Figure 7 for Figures 1 to 3 A longitudinal cross-sectional view of the rotating shaft of the drive device is provided.

[0026] Figure 8 for Figure 1 A schematic diagram of one polarity distribution of the first magnet and the second magnet.

[0027] Fig. 9 for Figure 1Schematic diagram of another polarity distribution of the first magnet and the second magnet.

[0028] Fig.10 for Figure 2 A schematic diagram of one polarity distribution of the first magnet and the second magnet.

[0029] Fig.11 for Figure 3 A schematic diagram of one polarity distribution of the first magnet and the second magnet.

[0030] Fig.12 A schematic diagram of the three-dimensional structure of a blood pump provided in another embodiment of the present application.

[0031] The numbers in the appendix are explained as follows:

[0032] 10. blood pump; 100. drive device; 110. housing; 111. first housing; 112. second housing; 101. proximal end; 102. distal end; 102a. mounting cavity; 103. accommodation cavity; 104. first step surface; 105. second step surface; 120. rotating assembly; 121. rotating shaft; 1211. connecting section; 1212. thrust ring; M. outer peripheral surface; N. distal side surface; P. proximal side surface; 122. rotor; 1221. flywheel; 1222. magnetic block; 130. stator; 140. Balance assembly; 141, first magnet; 1411, first end; 1412, third end; 142, second magnet; 1421, second end; 1422, fourth end; 142a, axial hole; 150, first bushing; 151, second surface; 160, second bushing; 170, fixing seat; 171, first surface; 200, pump housing; 210, first metal tube; 220, sleeve; 230, second metal tube; 201, proximal opening; 202, distal opening; 300, catheter; 400, flexible support member. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] It should be noted that the terms “distal end” and “proximal end” throughout the text are only used to indicate relative positional relationships. The “distal end” of a component refers to the end of the component that enters the patient's body first compared to the other end during normal operation and / or the end that is farther away from the operator, while the “proximal end” refers to the end that enters the patient's body later than the other end and / or the end that is closer to the operator. Figures 1 to 3 In the figure, the arrow Y+ indicates the direction from the "proximal end" to the "distal end"; the arrow Y- indicates the direction from the "distal end" to the "proximal end".

[0040] like Figures 1 to 3 As shown, an embodiment of the present application provides a driving device 100, which includes a housing 110, a stator 130, a rotating assembly 120 and a balancing assembly 140; the rotating assembly 120 includes a rotating shaft 121 and a rotor 122, the rotating shaft 121 is rotatably disposed on the housing 110, and the rotor 122 is fixedly connected to the rotating shaft 121; the stator 130 is fixedly connected to the housing 110, and the stator 130 generates a first attraction F1 along the axial direction of the rotating shaft 121 on the rotor 122 The balancing assembly 140, the rotor 122 and the stator 130 are arranged axially along the rotating shaft 121. The rotor 122 is located between the stator 130 and the balancing assembly 140. The balancing assembly 140 includes a first magnet 141 and a second magnet 142. The first magnet 141 is fixedly connected to the rotating shaft 121, and the second magnet 142 is fixedly connected to the housing 110. The second magnet 142 generates a second attraction F2 on the first magnet 141, and the direction of the second attraction F2 is opposite to that of the first attraction F1.

[0041] Specifically, when the stator 130 is working, it can generate a rotating magnetic field that causes the rotor 122 to rotate. The stator 130 includes an iron core and a coil surrounding the iron core; and the rotor 122 is a magnetic part, so there is a first attraction force F1 between the rotor 122 and the stator 130 that attracts each other. Since the stator 130 is fixed to the housing 110, the stator 130 remains relatively fixed, and the first attraction force F1 generated by the stator 130 on the rotor 122 will make the rotor 122 have a tendency to move toward the stator 130, so for the rotor 122, the direction of the first attraction force F1 on the rotor 122 is toward the stator 130.

[0042] Similarly, since the second magnet 142 of the balancing assembly 140 is fixedly connected to the shell 110, the second magnet 142 remains relatively fixed. Since the direction of the second attraction F2 generated by the second magnet 142 on the first magnet 141 is opposite to the direction of the first attraction F1, the first magnet 141 tends to move away from the stator 130.

[0043] Optionally, the first attraction F1 and the second attraction F2 can be equal in magnitude, so that the first attraction F1 and the second attraction F2 can offset each other, so that the rotating shaft 121 can maintain balance along its axial direction. Of course, in other embodiments, if it is considered that the driving device 100 will generate a thrust in the same direction as the second attraction F2 when it is working, the second attraction F2 can be slightly smaller than the first attraction F1. For example, when the driving device 100 is used to drive the impeller of the blood pump 10 to work, the impeller drives the blood to flow, and the blood flow will generate an axial thrust in the same direction as the second attraction F2 on the rotating shaft 121 through the impeller. This axial thrust can also offset part of the first attraction F1. At this time, the second attraction F2 can be smaller than the first attraction F1, and the rotor 122 can also be balanced in the axial direction of the rotating shaft 121. However, the axial thrust is usually small, so the axial thrust can be ignored, so that the first attraction F1 is set to be equal to the second attraction F2.

[0044] like Figure 4 As shown, the rotor 122 of the rotating component 120 may include a flywheel 1221 and a plurality of magnetic blocks 1222 disposed on the flywheel 1221, and the plurality of magnetic blocks 1222 are arranged in a Halbach array magnetic ring. Of course, the rotor 122 may not include the flywheel 1221. There is a large repulsive force and rotational torque between two adjacent magnetic blocks 1222 of the Halbach array magnetic ring, which makes it difficult to bond adjacent magnetic blocks 1222. Therefore, compared with a conventional drive device having two rotors 122, the drive device 100 of the present application has only one rotor 122, which reduces the number of rotors 122; and by adding a balancing component 140, the attraction of the stator 130 to the rotating shaft 121 of the only rotor 122 is balanced.

[0045] like Figure 5 As shown, the second magnet 142 may be a ring magnet and arranged around the outer periphery of the rotating shaft 121; or, the second magnet 142 may be composed of a plurality of magnet blocks that are arranged at intervals but not spliced, and the plurality of magnet blocks are arranged at intervals along the outer periphery of the rotating shaft 121. Figure 6As shown, for the first magnet 141, the entire first magnet 141 may also be a ring magnet; or the second magnet 142 may be composed of a plurality of magnetic blocks that are arranged at intervals but not spliced, and the plurality of magnetic blocks are arranged at intervals along the outer circumference of the rotating shaft 121. In this way, the structures of the first magnet 141 and the second magnet 142 are simpler than the rotor 122 with the Halbach array magnetic ring, thereby simplifying the structural complexity and manufacturing difficulty of the driving device 100.

[0046] It should be noted that the polarity of the proximal end of the first magnet 141 and the distal end of the first magnet 141 are opposite, for example, if the proximal end of the first magnet 141 is an N pole, the distal end of the first magnet 141 is an S pole; or, if the proximal end of the first magnet 141 is an S pole, the distal end of the first magnet 141 is an N pole. Similarly, the polarity of the proximal end of the second magnet 142 and the distal end of the second magnet 142 are opposite, for example, if the proximal end of the second magnet 142 is an N pole, the distal end of the second magnet 142 is an S pole; or, if the proximal end of the second magnet 142 is an S pole, the distal end of the second magnet 142 is an N pole. It is worth mentioning that, since the multiple magnetic blocks 1222 on the rotor 122 are arranged into a Halbach array magnetic ring, the end surface of the rotor 122 facing the second magnet 142 has both an S pole and an N pole, so there is both an attractive force and a repulsive force between the rotor 122 and the second magnet 142, and these attractive and repulsive forces offset each other, so that the magnetic force between the rotor 122 and the second magnet 142 can be ignored. Similarly, the magnetic force between the rotor 122 and the second magnet 142 can also be ignored.

[0047] It can be seen that the above-mentioned driving device 100, by arranging the second magnet 142 in the shell 110 and arranging the first magnet 141 on the rotating shaft 121, can use the second magnet 142 to generate a second attraction F2 on the first magnet 141, and the direction of the second attraction F2 is opposite to the direction of the first attraction F1 generated by the stator 130 on the rotor 122, so that the second attraction F2 can at least partially offset the first attraction F1 to reduce the axial force on the rotating shaft 121 and reduce the wear of the contact between the rotating shaft 121 and the shell 110 (such as the shaft sleeve). In this way, it is not necessary to arrange the rotor 122 with the Halbach array magnetic ring on both axial sides of the stator 130 to maintain the force balance of the rotating shaft 121, thereby reducing the number of rotors 122 and reducing the structural complexity and manufacturing difficulty of the driving device 100.

[0048] like Figures 1 to 3As shown, in some embodiments, a portion of the rotating shaft 121 is disposed inside the housing 110, and another portion of the rotating shaft 121 is disposed outside the housing 110 for connecting a component (such as an impeller) to be driven. Based on this, the rotating shaft 121 has a connecting end 1211 located outside the driving device 100, and the connecting end 1211 can be used to be fixedly connected to the impeller. Optionally, the housing 110 has a proximal end 101, a distal end 102 adjacent to the connecting end 1211, and a receiving cavity 103 located between the proximal end 101 and the distal end 102; the stator 130 and the rotor 122 are both located in the receiving cavity 103, and the second magnet 142 is located at the distal end 102. The positional relationship of the stator 130, the rotor 122 and the balancing assembly 140 is set in this way, which facilitates the assembly of the driving device 100.

[0049] Specifically, one end of the rotating shaft 121 away from the connecting end 1211 is rotatably mounted on the proximal portion 101 of the housing 110, and the rotating shaft 121 passes through the stator 130, the balancing assembly 140, and the distal portion 102, so that the connecting end 1211 of the rotating shaft 121 extends out of the housing 110. At this time, the direction of the first attraction F1 is the Y-direction, and the direction of the second attraction F2 is the Y+ direction. Of course, in some other embodiments, the balancing assembly 140 can also be located at the proximal portion 101 of the housing 110, and the rotor 122 can be located between the stator 130 and the balancing assembly 140; at this time, the direction of the first attraction F1 is the Y+ direction, and the direction of the second attraction F2 is the Y-direction.

[0050] The structure of the driving device 100 and its assembly process are briefly described below.

[0051] like Figures 1 to 3 As shown, in some embodiments, the driving device 100 may further include a first sleeve 150 and a second sleeve 160, wherein the first sleeve 150 is disposed at the proximal end 101 of the housing 110, and the second sleeve 160 is disposed at the distal end 102 of the housing 110, the first sleeve 150 is used for rotationally mounting the rotating shaft 121, and the second sleeve 160 is used for passing the rotating shaft 121. Both the first sleeve 150 and the second sleeve 160 are used to support the rotating shaft 121 to ensure that the rotating shaft 121 rotates smoothly.

[0052] Specifically, the second sleeve 160 is provided with a through hole, and the rotating shaft 121 is passed through the through hole of the second sleeve 160. The first sleeve 150 is provided with a groove, and the groove and the through hole of the first sleeve 150 are on the same central axis; the proximal end of the rotating shaft 121 is rotatably installed in the groove and abuts against the bottom of the groove. The greater the axial force along the Y-direction on the rotating shaft 121, the easier it is to cause the proximal end of the rotating shaft 121 to wear. Therefore, in this embodiment, since the second attractive force F2 at least partially offsets the first attractive force F1, the axial force along the Y-direction on the rotating shaft 121 can be reduced, thereby reducing the wear between the rotating shaft 121 and the first sleeve 150.

[0053] like Figures 1 to 3 As shown, in order to facilitate the installation of the first sleeve 150, the drive device 100 may further include a fixing seat 170, which is disposed in the proximal portion 101 of the housing 110. The fixing seat 170 may be a fixing pin, and the fixing seat 170 may be fixedly connected to the proximal portion 101 of the housing 110 by means of threading, bonding, etc., and the first sleeve 150 may be disposed in the fixing seat 170 by means of bonding, clamping, etc.

[0054] like Figures 1 to 3 As shown, the fixing seat 170 has a first surface 171 facing the stator 130, and the first sleeve 150 has a second surface 151 facing the stator 130, and at least one of the first surface 171 and the second surface 151 abuts against the stator 130. Preferably, both the first surface 171 and the second surface 151 abut against the stator 130. It should be noted that if the first surface 171 of the fixing seat 170 and the second surface 151 of the first sleeve 150 abut against the stator 130, the first surface 171 of the fixing seat 170 and the second surface 151 of the first sleeve 150 are flush. The housing 110 includes a first housing 111 and a second housing 112. After the first housing 111 and the second housing 112 are connected, a receiving cavity 103 is formed inside the first housing 111 and the second housing 112. Among them, the proximal end 101 of the housing 110 is located at the proximal end of the first housing 111; the distal end 102 of the housing 110 is located at the distal end of the second housing 112.

[0055] Before assembly, the first magnet 141 of the balancing assembly 140 can be fixedly connected to the rotating shaft 121 of the rotating assembly 120 in advance; and the second magnet 142 of the balancing assembly 140 can be fixed in advance to the second housing 112. During assembly, the rotating assembly 120 and the stator 130 can be installed in the first housing 111 first; then the fixing seat 170 with the first sleeve 150 installed and the second sleeve 160 can be installed on the proximal end of the first housing 111. When installing the fixing seat 170 of the first sleeve 150, once the first surface 171 of the fixing seat 170 and the second surface 151 of the first sleeve 150 are in contact with the stator 130, it can be determined that the fixing seat 170 and the first sleeve 150 have been installed in place. In addition, the second surface 151 of the first sleeve 150 is abutted against the stator 130, and the stator 130 can also be used to limit the first sleeve 150 in the axial direction. Finally, the second housing 112 fixed to the second magnet 142 is connected to the first housing 111 .

[0056] like Figures 1 to 3 As shown, in some embodiments, the diameter of the distal end portion 102 of the housing 110 gradually decreases in the direction from the stator 130 to the magnetic conductive member 140, so that the distal end portion 102 is truncated cone-shaped. When the driving device 100 is used to drive the impeller of the blood pump 10, the truncated cone-shaped distal end portion 102 can guide the flow of blood, so that the blood can smoothly flow into the blood flow channel through the proximal opening 201 or flow out of the blood flow channel through the proximal opening 201. It can be understood that, as Figure 1 As shown, the inner and outer contours of the distal end portion 102 of the shell 110 are both truncated cone-shaped, that is, the inner diameter and outer diameter of the distal end portion 102 of the shell 110 are gradually reduced along the direction from the stator 130 to the magnetic conductive member 140.

[0057] Since the inner diameter of the distal end portion 102 of the housing 110 gradually decreases in the direction from the stator 130 to the magnetic conductive member 140, the interior of the distal end portion 102 has an inner space that is close to a cone. With respect to the volume of the rotor 122 and the stator 130, the inner space in the distal end portion 102 is not sufficient to accommodate the rotor 122 and the stator 130, so that the inner space in the distal end portion 102 of the housing 110 cannot be utilized.

[0058] like Figure 1As shown, in view of the above situation, in this embodiment, the large diameter end of the distal end 102 of the housing 110 is provided with a mounting cavity 102a, and the second magnet 142 is embedded in the mounting cavity 102a. Among them, the large diameter end of the distal end 102 refers to the end of the distal end 102 with a larger diameter. The second magnet 142 is arranged in the large diameter end of the distal end 102 of the housing 110, and the space of the distal end 102 of the housing 110 can be fully utilized to accommodate the second magnet 142, so that the accommodating cavity 103 of the housing 110 does not need to reserve or reserve less space for accommodating the second magnet 142. In this way, the axial dimension of the accommodating cavity 103 of the housing 110 can be designed to be smaller, thereby shortening the axial dimension of the driving device 100 accordingly. When the driving device 100 is applied to the blood pump 10, the shorter the axial dimension of the driving device 100, the less difficult it is to push the blood pump, and the smoother it is to push the blood pump 10 into the patient's body.

[0059] Optionally, the second magnet 142 may be fixed to the large diameter section of the distal end portion 102 of the housing 110 by bonding or the like.

[0060] When the impeller of the blood pump 10 rotates, the shaft 121 is driven to move in the direction from the stator 130 to the rotor 122. In order to prevent the shaft 121 from moving too much, Figures 1 to 3 and Figure 7 As shown, in one embodiment, a thrust ring 1212 is disposed on the outer circumferential surface of the rotating shaft 121. The thrust ring 1212 is disposed between the second magnet 142 and the rotor 122 and is used to limit the axial movement of the rotating shaft 121. How the thrust ring 1212 limits the circumferential movement of the rotating shaft 121 is mainly related to the positional relationship between the first magnet 141, the second magnet 142, and the thrust ring 1212, which will be explained below.

[0061] Among them, Figure 7 As shown, the thrust ring 1212 has a proximal side surface P facing the rotor 122, and the proximal side surface P can be abutted against or fixedly connected to the rotor 122. In this way, when assembling, once the rotor 122 contacts the thrust ring 1212, it can be determined that the rotor 122 is installed in place on the rotating shaft 121. When the thrust ring 1212 is fixedly connected to the rotor 122, the bonding area between the rotor 122 and the rotating shaft 121 can be indirectly increased, and the connection strength between the rotor 122 and the rotating shaft 121 can be improved.

[0062] like Figures 1 to 3 As shown in FIG. 1 , the first magnet 141 is disposed on the thrust ring 1212. This allows the first magnet 141 to be bonded to the outer circumferential surface of the rotating shaft 121 or to the outer surface of the thrust ring 1212, which can indirectly improve the connection strength between the first magnet 141 and the rotating shaft 121. Optionally, the thrust ring 1212 has a circumferential surface M, a distal surface N, and a proximal surface P (see FIG. 1 ). Figure 7); wherein, the proximal side surface P faces the rotor 122 and is fixedly connected to the rotor 122; the distal side surface N faces away from the rotor 122; the first magnet 141 can be arranged on the circumferential surface M or the distal side surface N of the thrust ring 1212.

[0063] like Figure 1 and Figure 7 As shown, in one embodiment, the first magnet 141 is disposed on the circumferential surface M of the thrust ring 1212, and the first magnet 141 is opposite to the second magnet 142 along the axial direction of the rotating shaft 121. By disposing the first magnet 141 on the circumferential surface M of the thrust ring 1212, the attraction force generated by the second magnet 142 on the first magnet 141 can be distributed entirely along the axial direction without generating components in other directions.

[0064] Among them, Figure 8 and Fig. 9 As shown, the first magnet 141 has a first end 1411 facing the second magnet 142, and the second magnet 142 has a second end 1421 opposite to the first end 1411, and the polarity of the second end 1421 is opposite to that of the first end 1411. The first magnet 141 also has a third end 1412 away from the first end 1411, and the second magnet 142 also has a fourth end 1422 away from the second end 1421, and the polarity of the fourth end 1422 is also opposite to that of the third end 1412. The polarity distribution of the first magnet 141 and the second magnet 142 can be set accordingly according to the specific situation, as long as it can ensure that the first magnet 141 and the second magnet 142 are attracted to each other.

[0065] For example, Figure 8 As shown, the first end 1411 of the first magnet 141 is an N pole, and the second end 1421 of the second magnet 142 is an S pole. Fig. 9 As shown, the first end 1411 of the first magnet 141 is an S pole, and the second end 1421 of the second magnet 142 is an N pole.

[0066] Based on the first magnet 141 being disposed on the annular surface M of the thrust ring 1212 and being in a relative positional relationship with the second magnet 142 along the axial direction of the rotating shaft 121, the outer diameter of the thrust ring 1212 is further set to be larger than the inner diameter of the second magnet 142. In this way, when the rotating shaft 121 moves in the direction from the stator 130 to the rotor 122, the distal surface N of the thrust ring 1212 will abut against the proximal end surface of the second magnet 142, thereby preventing the rotating shaft 121 from continuing to move in the direction from the stator 130 to the rotor 122. It should be noted that when the rotating shaft 121 moves in the direction from the rotor 122 to the stator 130, the rotating shaft 121 is blocked by the bottom of the groove of the first sleeve 150, thereby preventing the rotating shaft 121 from moving too much.

[0067] like Figure 2 and Figure 3As shown, in other embodiments, the second magnet 142 has an axial hole 142a for the rotating shaft 121 to pass through; the first magnet 141 is disposed on the distal side N of the thrust ring 1212 and is at least partially received in the axial hole 142a (e.g. Fig.10 and Fig.11 As shown in FIG. 1 ). The first magnet 141 is at least partially inserted into the axial hole 142a of the second magnet 142, so that the axial length of the driving device 100 can be shortened, which is beneficial for the blood pump 10 to be delivered in the patient's body.

[0068] In these embodiments, the first end 1411 of the first magnet 141 and the second end 1421 of the second magnet 142 have opposite polarities. The third end 1412 of the first magnet 141 and the fourth end 1422 of the second magnet 142 also have opposite polarities. By setting the magnetic pole distribution of the first magnet 141 and the second magnet 142 in this way, the second magnet 142 can effectively generate an attractive force on the first magnet 141. It should be noted that the second attractive force F2 generated by the second magnet 142 on the first magnet 141 is the magnetic force component between the second magnet 142 and the first magnet 141 along the axial direction.

[0069] The polarity distribution of the first magnet 141 and the second magnet 142 can be set accordingly according to the specific situation, as long as the first magnet 141 and the second magnet 142 can be attracted to each other. For example, the first end 1411 of the first magnet 141 is the S pole, and the second end of the second magnet 142 is the N pole; for another example, the first end 1411 of the first magnet 141 is the N pole, and the second end of the second magnet 142 is the S pole.

[0070] There are two ways to arrange the first magnet 141 to at least partially extend into the shaft hole 142a of the second magnet 142. As an example, Figure 2 and Fig.10 As shown, the third end 1412 of the first magnet 141 extends into the shaft hole 142a, and the first end 1411 of the first magnet 141 is located outside the shaft hole 142a (that is, the first end 1411 is located between the shaft hole 142a and the distal end surface N of the thrust ring 1212). At this time, the outer diameter of the thrust ring 1212 is smaller than the diameter of the shaft hole 142a of the second magnet 142, and a first step surface 104 is provided in the distal end portion 102 of the housing 110. In this way, when the rotating shaft 121 moves in the direction from the stator 130 to the rotor 122, the thrust ring 1212 abuts against the first step surface 104 of the distal end portion 102 of the housing 110 through the first magnet 141, thereby preventing the rotating shaft 121 from continuing to move in the direction from the stator 130 to the rotor 122.

[0071] like Fig.10As shown, there is a gap between the outer circumference of the first magnet 141 and the inner circumference of the shaft hole 142a, which can prevent the two from being attracted together and affecting the rotation of the shaft 121. In addition, the fourth end 1422 of the second magnet 142 can be fixedly connected to the first step surface 104 by bonding or other methods, which can also increase the connection strength between the first magnet 141 and the distal end 102 of the housing 110.

[0072] As another example, Figure 3 and Fig.11 As shown, the first end 1411 of the first magnet 141 extends into the shaft hole 142a, and the third end 1412 of the first magnet 141 is located outside the shaft hole 142a (i.e., the third end 1412 is located on the side of the shaft hole 142a facing away from the rotor 122). Specifically, the axial thickness of the thrust ring 1212 can be increased so that the first end 1411 of the first magnet 141 is accommodated in the shaft hole 142a of the second magnet 142, which can also shorten the axial length of the driving device 100, facilitating the delivery of the blood pump 10 in the patient's body.

[0073] Furthermore, the outer diameter of the thrust ring 1212 is smaller than the diameter of the shaft hole 142a of the second magnet 142, and a second step surface 105 is provided in the distal end portion 102 of the housing 110 (see Figure 3 ). Thus, when the rotating shaft 121 moves in the direction from the stator 130 to the rotor 122, the thrust ring 1212 abuts against the second step surface 105 in the distal end 102 of the housing 110 through the third end 1412 of the first magnet 141, thereby preventing the rotating shaft 121 from continuing to move in the direction from the stator 130 to the rotor 122. Figure 3 As shown, there is a gap between the outer circumference of the first magnet 141 and the inner circumference of the shaft hole 142 a to prevent the two from being attracted together and affecting the rotation of the shaft 121 .

[0074] The driving device 100 of the present application can be applied to the blood pump 10, and of course can also be applied to other pumps. Fig.12 As shown, some embodiments of the present application further provide a blood pump 10, which includes a pump housing 200, an impeller, and a driving device 100 as described in any of the above items; the pump housing 200 is fixedly connected to the distal end of the housing 110 of the driving device 100, the pump housing 200 has a blood flow channel, and the impeller is rotatably disposed in the blood flow channel; the driving device 100 is fixedly connected to the pump housing 200, and a rotating shaft 121 of the driving device 100 is partially located in the blood flow channel to be fixedly connected to the impeller. Since the blood pump 10 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0075] Specifically, the pump housing 200 of the blood pump 10 is provided with a proximal opening 201 and a distal opening 202; the proximal opening 201 and the distal opening 202 are connected through the blood flow channel. The blood pump 10 can be a right heart interventional pump or a left heart interventional pump. When the blood pump 10 is a right heart interventional pump, the proximal opening 201 is a blood inlet, and the distal opening 202 is a blood outlet. When the blood pump 10 is a left heart interventional pump, the proximal opening 201 is a blood outlet, and the distal opening 202 is a blood inlet.

[0076] like Figure 2 As shown, in some embodiments, the blood pump 10 may further include a catheter 300, the distal end of which is fixedly connected to the proximal end of the driving device 100. The catheter 300 can accommodate the flushing tube, sensor optical fiber and other cables of the blood pump 10. The blood pump 10 may further include a flexible support member 400, which is fixedly connected to the distal end of the pump housing 200. The flexible support member 400 can abut against the inner wall of the tissue to position the distal end of the blood pump 10. The shape of the flexible support member 400 can be a pigtail shape, a spherical shape, an arrow shape or a prism shape, etc.

[0077] The right heart interventional pump and the left heart interventional pump may have certain differences or no differences in the structure of the pump housing 200. In some embodiments, the pump housing 200 of the left heart interventional pump may include a first metal tube 210, a sleeve 220 and a second metal tube 230 connected in sequence, the proximal opening 201 is opened in the second metal tube 230, and the distal opening 202 is opened in the first metal tube 210, wherein the sleeve 220 may be a curved tube with certain elasticity. In some embodiments, the pump housing 200 of the right heart interventional pump may be the same as the pump housing 200 of the left heart interventional pump. Of course, in other embodiments, the pump housing 200 of the right heart interventional pump may be a straight tube with a shorter length to facilitate passing through the narrow path of the right ventricle.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A driving device, characterized in that: include: case; A rotating assembly, the rotating assembly comprising a rotating shaft and a rotor, the rotating shaft being rotatably disposed on the housing, and the rotor being fixedly connected to the rotating shaft; A stator, wherein the stator is fixedly connected to the housing, and the stator generates a first attraction force on the rotor along the axial direction of the rotating shaft; as well as A balancing assembly, wherein the balancing assembly, the rotor and the stator are arranged axially along the rotating shaft, the rotor is located between the stator and the balancing assembly, the balancing assembly comprises a first magnet and a second magnet, the first magnet is fixedly connected to the rotating shaft, the second magnet is fixedly connected to the housing, the second magnet generates a second attraction to the first magnet, and the second attraction is opposite to the direction of the first attraction.

2. The driving device according to claim 1, characterized in that: The rotating shaft has a connecting end located outside the driving device; the shell has a proximal end, a distal end adjacent to the connecting end, and a accommodating cavity located between the proximal end and the distal end; the stator and the rotor are both arranged in the accommodating cavity, and the second magnet is arranged at the distal end.

3. The driving device according to claim 2, characterized in that: A thrust ring is arranged on the outer circumferential surface of the rotating shaft, and the thrust ring is arranged between the rotor and the second magnet; the first magnet is arranged on the thrust ring.

4. The driving device according to claim 3, characterized in that: The thrust ring has a circumferential surface; the first magnet is arranged on the circumferential surface of the thrust ring and is located between the second magnet and the rotor; wherein the first magnet has a first end facing the second magnet, the second magnet has a second end opposite to the first end, and the magnetic pole of the second end is opposite to the magnetic pole of the first end.

5. The driving device according to claim 3, characterized in that: The second magnet has an axial hole inside for the rotating shaft to pass through; the thrust ring has a distal end surface facing away from the rotor, and the first magnet is arranged on the distal end surface of the thrust ring and is at least partially accommodated in the axial hole; wherein, The first magnet has a first end facing the rotor, and the second magnet has a second end facing the rotor, wherein a magnetic pole of the second end is opposite to a magnetic pole of the first end.

6. The driving device according to claim 5, characterized in that: The first magnet also has a third end away from the rotor, the third end extends into the shaft hole, and the first end is located outside the shaft hole; or, the first end is located in the shaft hole, and the third end is located outside the shaft hole.

7. The driving device according to any one of claims 2 to 6, characterized in that: The diameter of the distal end portion of the shell gradually decreases in the direction from the stator to the rotor, so that the distal end portion is truncated cone-shaped. The large diameter end of the distal end portion is provided with an installation cavity, and the second magnet is embedded in the installation cavity.

8. The driving device according to any one of claims 2 to 6, characterized in that: The driving device further comprises a fixing seat and a first sleeve, wherein the fixing seat is arranged in the proximal end portion of the housing, and the fixing seat has a first surface facing the stator; the first sleeve is mounted on the fixing seat for the rotating shaft to be rotatably mounted, and the first sleeve has a second surface facing the stator; At least one of the first surface and the second surface abuts against the stator.

9. The driving device according to any one of claims 1 to 6, characterized in that: The driving device also includes at least one of the following four features: The first attraction is equal to the second attraction; The first magnet is a ring-shaped magnet and is arranged around the rotating shaft; The second magnet is a ring-shaped magnet; The rotor includes a plurality of magnets, and the plurality of magnets are arranged into a Halbach array magnetic ring.

10. A blood pump, characterized in that: The blood pump comprises a pump casing, an impeller and a driving device as described in any one of claims 1 to 9; wherein the pump casing is fixedly connected to the distal end of the housing of the driving device, and the pump casing has a blood flow channel; the impeller is rotatably disposed in the blood flow channel; the driving device is fixedly connected to the pump casing, and a rotating shaft portion of the driving device is located in the blood flow channel to be fixedly connected to the impeller.

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