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 rotating assembly, a stator and a magnetic conducting piece. Wherein the rotating assembly comprises a rotating shaft and a rotor, the rotating shaft is rotatably arranged in the shell, and the rotor is fixedly connected with the rotating shaft; the stator is fixedly connected with the shell, and the stator generates a first attraction force on the rotor along the axial direction of the rotating shaft; the magnetic conductive part is fixedly connected with the shell and is arranged along the axial direction of the rotating shaft together with the rotor and the stator, the rotor is positioned between the stator and the magnetic conductive part, the magnetic conductive part generates a second attraction force to the rotor, and the direction of the first attraction force is opposite to that of the second 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 particularly to a driving device and a blood pump. Background Art

[0002] A blood pump is a mechanical circulatory device that is inserted into a patient's body through a blood vessel to assist the heart in performing the blood pumping function. As one of the components of the blood pump, the driving device mainly provides power for the blood pump. Usually, two rotors are arranged inside the driving device. These two rotors are respectively located on the two axial sides of the stator. The two ends of the stator respectively generate attractive forces with opposite directions on the two rotors, so that the rotating shaft remains balanced along the axial direction under the action of these two attractive forces and does not displace along the axial direction. The rotors of such a driving device usually have Halbach array magnetic rings formed by arranging a plurality of sector-shaped magnetic blocks, and adjacent two magnetic blocks are fixed by bonding. However, there are relatively large repulsive forces and rotational torques between adjacent two magnetic blocks of the rotor, which makes the bonding of the rotor difficult, not easy to manufacture, and increases the complexity of the structure and the manufacturing difficulty of the driving device. Summary of the Utility Model

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

[0004] The driving device of the present application includes a housing, a rotating assembly, a stator and a magnetic conductive member. Among them, the rotating assembly includes a rotating shaft and a rotor. The rotating shaft is rotatably arranged in the housing, and the rotor is fixedly connected to the rotating shaft; the stator is fixedly connected to the housing, and the stator generates a first attractive force on the rotor along the axial direction of the rotating shaft; the magnetic conductive member is fixedly connected to the housing and is arranged along the axial direction of the rotating shaft with the rotor and the stator. The rotor is located between the stator and the magnetic conductive member, and the magnetic conductive member generates a second attractive force on the rotor. The directions of the first attractive force and the second attractive force are opposite.

[0005] In one embodiment, the rotating shaft has a connection end located outside the driving device; the housing has a proximal end, a distal end adjacent to the connection end, and an accommodation cavity located between the proximal end and the distal end; the stator and the rotor are both arranged in the accommodation cavity, and the magnetic conductive member is arranged at the distal end.

[0006] In one embodiment, the diameter of the distal end of the housing gradually decreases in the direction from the stator to the magnetic conductive member, so that the distal end is in a frustum shape; an installation cavity is provided at the large-diameter end of the distal end, and at least part of the magnetic conductive member is embedded in the installation cavity.

[0007] In one embodiment, the magnetic member includes a main body portion embedded in the installation cavity, and the shape of the main body portion is set as a frustum shape adapted to the distal end portion of the housing.

[0008] In one embodiment, the driving device further includes a first bushing, and the first bushing is installed at the distal end portion of the housing for the rotating shaft to pass through; a stepped surface adjacent to the first bushing is provided in the installation cavity, and the end surface of the magnetic member facing away from the rotor abuts against or is fixedly connected to the stepped surface.

[0009] In one embodiment, the driving device further includes a fixed seat and a second bushing; the fixed seat is disposed inside the proximal end portion of the housing, and the fixed seat has a first surface facing the stator; the second bushing is installed on the fixed seat for the rotating shaft to be rotatably installed, and the second bushing has a second surface facing the stator; wherein, at least one of the first surface and the second surface abuts against the stator.

[0010] In one embodiment, a thrust ring is provided on the outer peripheral surface of the rotating shaft, and the thrust ring is disposed between the magnetic member and the rotor. The thrust ring has a first thrust surface and a second thrust surface. The first thrust surface can abut against the magnetic member, and the second thrust surface can abut against the rotor.

[0011] In one embodiment, the magnetic member is provided with a shaft hole for the rotating shaft to pass through and a receiving groove communicating with the shaft hole. The radial width of the receiving groove is greater than the aperture of the shaft hole, so that the receiving groove has a groove bottom surface adjacent to the shaft hole; at least a part of the thrust ring is located in the receiving groove, so that the first thrust surface can abut against the groove bottom surface of the receiving groove.

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

[0013] The first attractive force is equal to the second attractive force in magnitude;

[0014] The rotor includes a plurality of magnets, and the plurality of magnets are arranged into a Halbach array magnetic ring;

[0015] The magnetic member is a magnetically conductive metal that can be attracted by a magnetic member, and the magnetically conductive metal includes one or more materials of iron, cobalt, and nickel.

[0016] The present application also provides a blood pump, which includes a pump housing, an impeller and a driving device. Among them, the pump housing is fixedly connected to the distal end of the housing of the driving device. The pump housing has a blood flow passage. The impeller is rotatably arranged in the blood flow passage. The structure of the driving device refers to any of the above embodiments. The driving device is fixedly connected to the pump housing, and a rotating shaft portion of the driving device is located in the blood flow passage to be fixedly connected to the impeller.

[0017] In the above driving device, by adding a magnetic conductive member in the housing, and the rotor of the driving device is located between the stator and the magnetic conductive member, the magnetic conductive member can generate a second attractive force on the rotor, and the direction of the second attractive force is opposite to that of the first attractive force generated by the stator on the rotor. Thus, the second attractive force can at least partially offset the first attractive force to reduce the axial force on the rotating shaft and reduce the wear at the contact between the rotating shaft and the housing (such as the shaft sleeve). In this way, it is not necessary to arrange rotors on both axial sides of the stator to maintain the force balance of the rotating shaft, and thus the number of rotors can be reduced, and the complexity of the structure of the driving device and the manufacturing difficulty can be reduced. Description of the Drawings

[0018] Figure 1 It is a longitudinal sectional view of the driving device provided by an embodiment of the present application.

[0019] Figure 2 It is Figure 1 A three-dimensional structural schematic diagram of the rotor of the driving device provided.

[0020] Figure 3 It is Figure 1 A three-dimensional structural schematic diagram of the magnetic conductive member of the driving device provided.

[0021] Figure 4 It is Figure 3 A side view of the magnetic conductive member provided.

[0022] Figure 5 It is Figure 1 A sectional view of the rotating shaft of the driving device provided.

[0023] Figure 6 It is Figure 4 A sectional view of the magnetic conductive member in the A-A direction provided.

[0024] Figure 7 It is a three-dimensional structural schematic diagram of the blood pump provided by an embodiment of the present application.

[0025] Among them, the reference numerals in the drawings are described as follows:

[0026] 10. Blood pump; 100. Driving device; 110. Housing; 111. First housing; 112. Second housing; 101. Proximal end; 102. Distal end; 103. Accommodation cavity; 102a. Installation cavity; 102b. Step surface; 120. Rotating assembly; 121. Rotating shaft; 1211. Connection end; 1212. Thrust ring; M. First thrust surface; N. Second thrust surface; 122. Rotor; 1221. Flywheel; 1222. Magnet; 130. Stator; 140. Magnetic conductive member; 141. Shaft hole; 142. Accommodating groove; P. Bottom surface of the groove; 150. Second shaft sleeve; 151. Second surface; 160. First shaft sleeve; 170. Fixed 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 implementation manners

[0027] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand 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 departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0029] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plural", the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In this application, unless otherwise clearly defined and limited, if there is a description such as the first feature being "on" or "under" the second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0033] It should be noted that the "distal end" and "proximal end" throughout the text are only for indicating the relative position relationship. The "distal end" of a component refers to the end of the component that first enters the patient's body compared to the other end and / or the end that is farther from the operator during normal operation, while the "proximal end" refers to the end that enters the patient's body later compared to the other end and / or the end that is closer to the operator. Figures 1 to 3 In, 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".

[0034] As Figure 1 shown, an embodiment of the present application provides a driving device 100, and the driving device 100 can be applied to a blood pump 10 (see Figure 2 ), and can also be applied to other pump machines that require electric drive.

[0035] As Figure 1As shown, in one embodiment, the driving device 100 may include a housing 110, a rotating assembly 120, a stator 130, and a magnetic conductive member 140; the rotating assembly 120 includes a rotating shaft 121 and a rotor 122, the rotating shaft 121 is rotatably disposed in 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 attractive force F1 on the rotor 122 in the axial direction of the rotating shaft 121; the magnetic conductive members 140 are all fixedly connected to the housing 110, the magnetic conductive members 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 magnetic conductive members 140, the magnetic conductive members 140 generate a second attractive force F2 on the rotor 122, and the directions of the first attractive force F1 and the second attractive force F2 are opposite.

[0036] Specifically, when the stator 130 operates, it can generate a rotating magnetic field that causes the rotor 122 to rotate. The stator 130 includes an iron core and a coil wound around the iron core; and the rotor 122 is a magnetic member, so there is a first attractive force F1 that attracts each other between the rotor 122 and the stator 130. Since the stator 130 is fixedly connected to the housing 110 and the stator 130 remains relatively fixed, the first attractive force F1 generated by the stator 130 on the rotor 122 will cause the rotor 122 to tend to move in the direction of approaching the stator 130. Therefore, for the rotor 122, the direction of the first attractive force F1 received by the rotor 122 is towards the stator 130 (that is, as Figure 1 shown in the Y - direction).

[0037] Similarly, since the magnetic conductive members 140 are fixedly connected to the housing 110 and the magnetic conductive members 140 remain relatively fixed, the second attractive force F2 generated by the magnetic conductive members 140 on the rotor 122 will cause the rotor 122 to tend to move in the direction of approaching the magnetic conductive members 140. Therefore, for the rotor 122, the direction of the second attractive force F2 received by the rotor 122 is towards the magnetic conductive members 140 (that is, as Figure 1 shown in the Y+ direction).

[0038] Optionally, the first attractive force F1 and the second attractive force F2 may be equal in magnitude, so that the first attractive force F1 and the second attractive force F2 can cancel each other out, causing the rotating shaft 121 to maintain balance along its axial direction. Of course, in other embodiments, if it is considered that a thrust force in the same direction as the second attractive force F2 will be generated when the driving device 100 operates, then the second attractive force F2 may be slightly smaller than the first attractive force F1. For example, when the driving device 100 is applied 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 force in the same direction as the second attractive force F2 on the rotating shaft 121 through the impeller. This axial thrust force can also cancel out part of the first attractive force F1. At this time, the second attractive force F2 can be smaller than the first attractive force F1, and the rotor 122 can also be in force balance in the axial direction of the rotating shaft 121. However, since the axial thrust force is usually small, the axial thrust force can be ignored, and thus the first attractive force F1 is set to be equal in magnitude to the second attractive force F2.

[0039] As Figure 2 shown, the rotor 122 of the rotating assembly 120 includes a flywheel 1221 and a plurality of magnetic blocks 1222 arranged on the flywheel 1221. The plurality of magnetic blocks 1222 are arranged in a Halbach array magnetic ring. Of course, the flywheel 1221 may not be provided on the rotor 122. There is a large repulsive force and rotational torque between two adjacent magnetic blocks 1222 of the rotor 122, making it difficult to bond the adjacent magnetic blocks 1222. Therefore, compared with the traditional driving device having two rotors 122, the driving device 100 of the present application only has one rotor 122, reducing the number of rotors 122; and a magnetic conductive member 140 is added to balance the attractive force generated by the stator 130 on the only one rotor 122 on the rotating shaft 121.

[0040] Among them, the entire magnetic conductive member 140 can be an annular member. The magnetic conductive member 140 is a magnetic conductive metal that can be attracted by a magnetic member. In other words, the magnetic conductive member 140 itself does not have magnetism, but can be attracted by a magnetic member. Optionally, the magnetic conductive metal includes one or more materials of iron, cobalt, and nickel. This material can be magnetized under the action of an external magnetic field, so that the magnetic conductive member 140 can be adsorbed by the magnetic material. That is to say, the magnetic conductive member 140 can be adsorbed by the rotor 122 under the action of the magnetic field generated by the rotor 122, so that a second attractive force F2 is generated between the magnetic conductive member 140 and the rotor 122.

[0041] It can be seen that in the above-mentioned driving device 100, by adding a magnetic conductive member 140 inside the housing 110 and arranging the rotor 122 between the stator 130 and the magnetic conductive member 140, a second attractive force F2 is generated on the rotor 122 by the magnetic conductive member 140. The direction of the second attractive force F2 is opposite to that of the first attractive force F1 generated by the stator 130 on the rotor 122. Thus, the second attractive force F2 can at least partially offset the first attractive force F1, so as to reduce the axial force received by one side of the rotating shaft 121 and alleviate the wear at the contact between the rotating shaft 121 and the housing 110 (such as a bushing). In this way, it is not necessary to arrange rotors 122 with Halbach array magnetic rings on both axial sides of the stator 130 to maintain the force balance of the rotating shaft 121. Furthermore, the number of rotors 122 can be reduced, and the complexity of the structure and the manufacturing difficulty of the driving device 100 can be lowered.

[0042] In some embodiments, as Figure 1 shown, a part of the rotating shaft 121 is arranged inside the housing 110, and another part of the rotating shaft 121 is arranged outside the housing 110 for connecting the component to be driven (such as an impeller). Based on this, the rotating shaft 121 has a connection end 1211 located outside the housing 110, and the connection end 1211 can be used for fixedly connecting with the impeller. Optionally, the housing 110 has a proximal end 101, a distal end 102 adjacent to the connection end 1211, and a receiving cavity 103 located between the proximal end 101 and the distal end 102; both the stator 130 and the rotor 122 are arranged in the receiving cavity 103, and the magnetic conductive member 140 is arranged at the distal end 102. Such an arrangement of the installation positions of the stator 130, the rotor 122, and the magnetic conductive member 140 facilitates the assembly of the driving device 100.

[0043] Specifically, one end of the rotating shaft 121 away from the connection end 1211 is rotatably installed at the proximal end 101 of the housing 110, and the rotating shaft 121 passes through the stator 130, the magnetic conductive member 140, and the distal end 102, so that the connection end 1211 of the rotating shaft 121 extends to the outside of the housing 110. At this time, the direction of the first attractive force F1 is the Y - direction, and the direction of the second attractive force F2 is the Y + direction. Of course, in some other embodiments, the magnetic conductive member 140 can also be located at the proximal end 101 of the housing 110, and the rotor 122 is located between the stator 130 and the magnetic conductive member 140; at this time, the direction of the first attractive force F1 is the Y + direction, and the direction of the second attractive force F2 is the Y - direction.

[0044] Next, a brief description will be continued on the structure and the assembly process of the driving device 100.

[0045] As Figure 1As shown, in some embodiments, the driving device 100 may further include a first bushing 160 and a second bushing 150. Among them, the first bushing 160 is installed at the distal end portion 102 of the housing 110 for the rotating shaft 121 to pass through. The second bushing 150 is disposed at the proximal end portion 101 of the housing 110 for the rotating shaft 121 to be rotatably mounted. Both the second bushing 150 and the first bushing 160 are used to support the rotating shaft 121 to ensure the smooth rotation of the rotating shaft 121.

[0046] Specifically, the first bushing 160 is provided with a through hole, and the rotating shaft 121 passes through the through hole of the first bushing 160. The second bushing 150 is provided with a groove, and the groove and the through hole of the first bushing 160 are on the same central axis; the proximal end of the rotating shaft 121 is rotatably mounted in the groove and abuts against the bottom of the groove. The greater the axial force in the Y - direction applied to the rotating shaft 121, the more likely it is to cause wear of the proximal end of the rotating shaft 121. Therefore, in this embodiment, since the second attraction force F2 at least partially offsets the first attraction force F1, the axial force in the Y - direction applied to the rotating shaft 121 can be reduced, thereby reducing the wear between the rotating shaft 121 and the second bushing 150.

[0047] Furthermore, for the convenience of installing the second bushing 150, as Figure 1 shown, the driving device 100 further includes a fixing seat 170, and the fixing seat 170 is disposed inside the proximal end portion 101 of the housing 110. The fixing seat 170 can be a fixing pin, and the fixing seat 170 can be fixedly connected to the proximal end portion 101 of the housing 110 by means of threads, bonding, etc., and the second bushing 150 can be disposed inside the fixing seat 170 by means of bonding, snap - fitting, etc.

[0048] As Figure 1 shown, among them, the fixing seat 170 has a first surface 171 facing the stator 130, and the second bushing 150 has a second surface 151 facing the stator 130; 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 both the first surface 171 of the fixing seat 170 and the second surface 151 of the second bushing 150 abut against the stator 130, the first surface 171 of the fixing seat 170 and the second surface 151 of the second bushing 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, an accommodation cavity 103 is formed inside the first housing 111 and the second housing 112. The proximal end portion 101 of the housing 110 is located at the proximal end of the first housing 111; the distal end portion 102 of the housing 110 is located at the distal end of the second housing 112.

[0049] Before assembly, the magnetic conduction member 140 can be pre-fixed inside the second housing 112. During assembly, the rotating assembly 120 and the stator 130 can be first installed on the magnetic conduction member 140 in the first housing 111, and then the fixing seat 170 with the second bushing 150 and the first bushing 160 can be installed on the first housing 111. Once the first surface 171 of the fixing seat 170 and the second surface 151 of the second bushing 150 abut against the stator 13, it can be determined that the fixing seat 170 and the second bushing 150 are installed in place. In addition, by abutting the second surface 151 of the second bushing 150 against the stator 130, the stator 130 can also play an axial limiting role on the second bushing 150 to prevent the second bushing 150 from falling off the fixing seat 170. Finally, the second housing 112 fixed to the magnetic conduction member 140 can be connected to the first housing 111.

[0050] As Figure 1 and Figure 7 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 conduction member 140, making the distal end portion 102 frustum-shaped. When the driving device 100 is applied to drive the impeller of the blood pump 10 to work, the frustum-shaped distal end portion 102 can play a guiding role in the blood flow, enabling the blood to smoothly flow into or out of the blood flow path through the proximal opening 201. It can be understood that, as Figure 1 shown, both the inner and outer contours of the distal end portion 102 of the housing 110 are frustum-shaped, that is, the inner diameter and the outer diameter of the distal end portion 102 of the housing 110 gradually decrease in the direction from the stator 130 to the magnetic conduction member 140.

[0051] 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 conduction member 140, an internal space close to a cone is formed inside the distal end portion 102. For the volumes of the rotor 122 and the stator 130, the internal space inside the distal end portion 102 is not sufficient to accommodate the rotor 122 and the stator 130, resulting in the underutilization of the internal space inside the distal end portion 102 of the housing 110.

[0052] In view of the above situation, as Figure 1As shown, in this embodiment, an installation cavity 102a is provided at the large-diameter end of the distal end portion 102 of the housing 110, and at least a part of the magnetic conductive member 140 is embedded in the installation cavity 102a. Herein, the large-diameter end of the distal end portion 102 refers to the end with a larger diameter of the distal end portion 102. By disposing the magnetic conductive member 140 in the installation cavity 102a at the distal end portion 102 of the housing 110, the internal space of the distal end portion 102 of the housing 110 can be fully utilized to accommodate the magnetic conductive member 140, so that the accommodation cavity 103 of the housing 110 does not need to reserve or only needs to reserve a small amount of space for accommodating the magnetic conductive member 140. Thus, the axial dimension of the accommodation cavity 103 of the housing 110 can be designed to be smaller, and accordingly, the axial dimension of the driving device 100 can be shortened. When the driving device 100 is applied to the blood pump 10, the shorter the axial dimension of the driving device 100 is, the smaller the pushing difficulty of the blood pump is, and the more smoothly the blood pump 10 can be pushed into the patient's body.

[0053] It can be understood that the magnetic conductive member 140 can be integrally embedded in the installation cavity 102a, or as Figure 1 shown, the middle part of the magnetic conductive member 140 and the distal part of the connection end 1211 adjacent to the rotating shaft 121 are embedded in the installation cavity 102a, while the proximal part of the magnetic conductive member 140 adjacent to the rotor 122 can be in a cylindrical shape and installed in the accommodation cavity 103 of the housing 110.

[0054] The magnetic conductive member 140 can be fixedly connected to the installation cavity 102a at the distal end portion 102 of the housing 110 by means of bonding or the like. Embedding at least the middle part and the distal part of the magnetic conductive member 140 in the installation cavity 102a can also ensure the connection strength between the magnetic conductive member 140 and the housing 110.

[0055] As Figure 1 、 Figures 3 to 5 shown, the magnetic conductive member 140 includes a main body part embedded in the installation cavity 102a, and the shape of the main body part is set to be a frustum shape adapted to the distal end portion 102 of the housing 110. Setting the magnetic conductive member 140 to have the same structure as the installation cavity 102a can further fully utilize the space at the distal end of the housing 110, and can also increase the volume of the magnetic conductive member 140, so that the second attraction force generated by the magnetic conductive member 140 on the rotor 122 can be the same as the magnitude of the first attraction force.

[0056] Continuing to refer to Figure 1 , the installation cavity 102a may have a step surface 102b adjacent to the first bushing 160, and the end surface of the magnetic conductive member 140 facing away from the rotor 122 abuts against or is fixedly connected to the step surface 101. During assembly, once the magnetic conductive member 140 contacts the step surface 101, it can be determined that the magnetic conductive member 140 is installed in place. And when the magnetic conductive member 140 is fixedly connected to the step surface 101, the step surface 101 can also increase the bonding area between the magnetic conductive member 140 and the housing 110 and improve the connection strength between the two.

[0057] When the impeller rotates, it will drive the rotating shaft 121 to move axially in the proximal-to-distal direction. To prevent the excessive axial movement of the rotating shaft 121, as Figure 1 and Figure 5 shown, in one embodiment, a thrust ring 1212 is provided on the outer peripheral surface of the rotating shaft 121. The thrust ring 1212 is disposed between the magnetic conductive member 140 and the rotor 122. The thrust ring 1212 has a first thrust surface M and a second thrust surface N. The first thrust surface M can abut against the magnetic conductive member 140, and the second thrust surface N can abut against the rotor 122.

[0058] Among them, as Figure 6 shown, the magnetic conductive member 140 is axially provided with a shaft hole 141 for the rotating shaft 121 to pass through, and a receiving groove 142 communicated with the shaft hole 141. The radial width D2 of the receiving groove 142 is greater than the aperture D1 of the shaft hole 141, that is, D2 > D1, so that the receiving groove 142 has a groove bottom surface P adjacent to the shaft hole 141; at least part of the thrust ring 1212 is located in the receiving groove 142, so that the first thrust surface M can abut against the groove bottom surface P of the receiving groove 142.

[0059] Placing at least part of the thrust ring 1212 in the receiving groove 142, rather than disposing the entire thrust ring 1212 outside the magnetic conductive member 140, can further shorten the axial length of the driving device 100, which is beneficial to the delivery of the blood pump 10 in the patient's body. Among them, the thrust ring 1212 can be integrally received in the receiving groove 142, or as Figure 1 shown, the middle part and the end part facing the magnetic conductive member 140 of the thrust ring 1212 are received in the receiving groove 142.

[0060] The thrust ring 1212 can abut against the groove bottom surface P of the receiving groove 142. In this way, it is equivalent to clamping the magnetic conductive member 140 between the stepped surface 101 of the housing 110 and the thrust ring 1212, which can prevent the magnetic conductive member 140 from moving towards the rotor 122 under the attraction of the rotor 122, and can also further shorten the axial length of the driving device 100. It should be noted that in order not to hinder the rotation of the rotating shaft 121, the thrust ring 1212 only contacts the groove bottom surface P of the receiving groove 142 and is not fixedly connected in any way (such as bonding).

[0061] Of course, the thrust ring 1212 may also have a gap with the bottom surface P of the receiving groove 142. This gap can prevent the thrust ring 1212 from contacting the bottom surface of the receiving groove 142, thereby preventing the generation of frictional force between the rotor 122 and the magnetic conductive member 140. It should be noted that the gap between the thrust ring 1212 and the receiving groove 142 can be on the millimeter level, for example, within 3 mm. When the rotating shaft 121 moves axially in the proximal-to-distal direction, once the thrust ring 1212 moves to abut against the bottom surface P of the receiving groove 142, the bottom surface P can block the further movement of the rotating shaft 121 towards the distal end; moreover, the force transmitted by the rotating shaft 121 to the magnetic conductive member 140 through the bottom surface P will be further transmitted to the stepped surface 102b of the housing 110 through the magnetic conductive member 140, rather than being transmitted to the first bushing 160, thus preventing the first bushing 160 from being pushed loose by the rotating shaft 120.

[0062] The first thrust surface M of the thrust ring 1212 can abut against or be fixedly connected to the rotor 122. In this way, during assembly, once the rotor 122 contacts the first thrust surface M of the thrust ring 1212, it can be determined that the rotor 122 is installed in place on the rotating shaft 121. Also, 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.

[0063] The drive device 100 of the present application can be applied to the blood pump 10, and of course, it can also be applied to other pump machines. As Figure 7 shown, some embodiments of the present application also provide a blood pump 10, which includes a pump housing 200, an impeller, and the drive device 100 as described in any of the above embodiments; the pump housing 200 is fixedly connected to the distal end of the housing 110 of the drive device 100, the pump housing 200 has a blood flow channel; the impeller is rotatably disposed in the blood flow channel; the drive device 100 is fixedly connected to the pump housing 200, and a part of the rotating shaft 121 of the drive device 100 is located in the blood flow channel to be fixedly connected to the impeller. Since the blood pump 10 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0064] 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 the blood inlet, and the distal opening 202 is the blood outlet. When the blood pump 10 is a left heart interventional pump, the proximal opening 201 is the blood outlet, and the distal opening 202 is the blood inlet.

[0065] As Figure 7As shown, in some embodiments, the blood pump 10 may further include a catheter 300, and the distal end of the catheter 300 is fixedly connected to the proximal end of the driving device 100. The catheter 300 can accommodate cables such as the flushing tube and the sensor optical fiber of the blood pump 10. The blood pump 10 may further include a flexible support member 400, and the flexible support member 400 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 pig-tail shape, a spherical shape, an arrow shape, a rhombus shape, etc.

[0066] There may be certain differences or no differences in the structure of the pump housing 200 between the right heart interventional pump and the left heart interventional pump. 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 formed in the second metal tube 230, and the distal opening 202 is formed in the first metal tube 210, where the sleeve 220 can be a bent tube with a 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.

[0067] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0068] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A driving device, characterized in that, Comprising: A housing; A rotating assembly, the rotating assembly including a rotating shaft and a rotor, the rotating shaft being rotatably disposed in the housing, and the rotor being fixedly connected to the rotating shaft; A stator, the stator being fixedly connected to the housing, the stator generating a first attractive force on the rotor along the axial direction of the rotating shaft; and A magnetic conductive member, the magnetic conductive member being fixedly connected to the housing, and being arranged axially along the rotating shaft with the rotor and the stator, the rotor being located between the stator and the magnetic conductive member, the magnetic conductive member generating a second attractive force on the rotor, and the directions of the first attractive force and the second attractive force being opposite.

2. The drive device according to claim 1, wherein The rotating shaft has a connection end located outside the housing; the housing has a proximal end, a distal end adjacent to the connection end, and a receiving cavity located between the proximal end and the distal end; the stator and the rotor are both arranged in the receiving cavity, and the magnetic conductive member is arranged at the distal end.

3. The drive device according to claim 2, characterized in that, The diameter of the distal end of the housing gradually decreases in the direction from the stator to the magnetic conductive member, so that the distal end is in a frustum shape; an installation cavity is provided at the large-diameter end of the distal end, and at least part of the magnetic conductive member is embedded in the installation cavity.

4. The drive device according to claim 3, characterized in that The magnetic conductive member includes a main body part embedded in the installation cavity, and the shape of the main body part is set to be frustum-shaped and adapted to the distal end of the housing.

5. The drive device according to claim 3, characterized in that The driving device further includes a first shaft sleeve, the first shaft sleeve is installed at the distal end of the housing for the rotating shaft to pass through; a step surface adjacent to the first shaft sleeve is provided in the installation cavity, and the end surface of the magnetic conductive member facing away from the rotor abuts against or is fixedly connected to the step surface.

6. The drive device according to claim 2, characterized in that The driving device further includes a fixed seat and a second shaft sleeve; the fixed seat is arranged at the proximal end of the housing, and the fixed seat has a first surface facing the stator; the second shaft sleeve is installed on the fixed seat for the rotating shaft to be rotatably installed, and the second shaft sleeve has a second surface facing the stator; wherein, at least one of the first surface and the second surface abuts against the stator.

7. The drive device according to any one of claims 1 to 6, characterized in that, A thrust ring is arranged on the outer peripheral surface of the rotating shaft, the thrust ring is arranged between the magnetic conductive member and the rotor, the thrust ring has a first thrust surface and a second thrust surface, the first thrust surface can abut against the magnetic conductive member, and the second thrust surface can abut against the rotor.

8. The drive device according to claim 7, characterized in that, The magnetic conductive member is provided with a shaft hole for the rotating shaft to pass through, and a receiving groove communicated with the shaft hole, the radial width of the receiving groove is greater than the aperture of the shaft hole, so that the receiving groove has a groove bottom surface adjacent to the shaft hole; at least part of the thrust ring is located in the receiving groove, so that the first thrust surface can abut against the groove bottom surface of the receiving groove.

9. The drive device according to any one of claims 1 to 6, characterized in that, The driving device at least further includes one of the following three features: The first attractive force is equal to the second attractive force in magnitude; The rotor includes a plurality of magnetic blocks, and the plurality of magnetic blocks are arranged into a Halbach array magnetic ring; The magnetic conductive member is a magnetic conductive metal that can be attracted by a magnetic member, and the magnetic conductive metal includes one or more materials of iron, cobalt, and nickel.

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

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