Drive mechanism and blood pump

Abstract

The application relates to a driving mechanism and a blood pump, the driving mechanism comprising a shell assembly and a rotating assembly, the shell assembly being provided with a mounting groove and a through hole, the mounting groove being provided with a bottom wall and a side wall; the rotating assembly being provided with a distal end and a proximal end, the distal end of the rotating assembly being rotatably arranged in the through hole, the proximal end of the rotating assembly being provided with a rotating head, the rotating head being rotatably arranged in the mounting groove and being in sliding abutment with the bottom wall and the side wall, and the rotating head being provided with a first spherical wall, the first spherical wall being tangent to the side wall. The service life of the driving mechanism and the blood pump is relatively long.

Description

TECHNICAL FIELD

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

[0002] Blood pumps are designed to be inserted percutaneously into a blood vessel of a patient, for example into an artery or vein of the thigh or axillary, and can be advanced into the heart of the patient to function as a left ventricular assist device or a right ventricular assist device. Therefore, blood pumps can also be referred to as intracardiac blood pumps or intravascular blood pumps.

[0003] Generally, a blood pump has a driving mechanism and an impeller, the impeller is connected with a rotating assembly of the driving mechanism, in order to realize stable rotation of the rotating assembly, a structure for positioning or limiting the rotating assembly is usually required to be arranged, and the limiting end of the rotating assembly usually rotates relative to the housing to cause abrasion, which makes it difficult to maintain the wear resistance of the rotating assembly for a long time. SUMMARY

[0004] The present application aims to provide a driving mechanism and a blood pump with a longer service life.

[0005] The present application provides a driving mechanism, which comprises:

[0006] A housing assembly has a mounting slot and a through hole, the mounting slot has a bottom wall and a side wall; a rotating assembly has a distal end and a proximal end, the distal end of the rotating assembly is rotatably arranged in the through hole, the proximal end of the rotating assembly has a rotating head, the rotating head is rotatably arranged in the mounting slot and in sliding abutment with the bottom wall and the side wall, the rotating head has a first spherical wall, and the first spherical wall is tangent to the side wall.

[0007] Optionally, the cross section of the mounting slot along the direction perpendicular to the rotation axis of the rotating assembly is circular or rectangular.

[0008] Optionally, the cross section of the side wall along the direction of the rotation axis of the rotating assembly is parallel to the rotation axis of the rotating assembly.

[0009] Optionally, the first spherical wall is tangent to the bottom wall, and / or the bottom wall is perpendicular to the side wall.

[0010] Optionally, the mounting slot further has a slot opening and an arc wall, the rotating head is arranged in the slot opening, the side wall connects the arc wall and the bottom wall, and the arc wall is close to the slot opening.

[0011] Optionally, the distance from the tangent point where the first spherical wall is tangent to the side wall to the connecting line of the side wall and the bottom wall is 60%-75% of the distance from the notch to the connecting line of the side wall and the bottom wall.

[0012] Optionally, the distance from the tangent point where the first spherical wall is tangent to the side wall to the connecting line of the side wall and the arc is 0.01mm-0.015mm.

[0013] Optionally, the rotating head comprises a spherical head portion and a rod portion connected to the spherical head portion, the rod portion is arranged in the notch of the mounting groove, the spherical head portion is rotatably received in the mounting groove, one end of the rod portion close to the spherical head portion forms an avoiding section, the avoiding section is arranged in the notch of the mounting groove, and the width of the cross section of the avoiding section in the direction perpendicular to the rotating axis of the rotating assembly is less than the diameter of the spherical head portion.

[0014] Optionally, the width of the cross section of the avoiding section in the direction perpendicular to the rotating axis of the rotating assembly is 75%-85% of the diameter of the sphere where the spherical head portion is located.

[0015] Optionally, the rotating head comprises a spherical head portion, the spherical head portion is arranged in the notch of the mounting groove, the caliber of the notch of the mounting groove is less than or equal to the diameter of the sphere where the spherical head portion is located, and greater than or equal to 1 / 2 of the diameter of the sphere where the spherical head portion is located.

[0016] Optionally, the rotating head further comprises a second spherical wall, the second spherical wall is connected to the first spherical wall, the second spherical wall is in sliding abutment with the bottom wall of the mounting groove, and the second spherical wall is tangent to the bottom wall.

[0017] Optionally, the rotating head further comprises a convex ring, the central axis of the convex ring coincides with the rotating axis of the rotating assembly, and the second spherical wall is arranged on the convex ring.

[0018] Optionally, the inner diameter of the convex ring is not less than 1 / 2 of the diameter of the sphere where the first spherical wall is located.

[0019] Optionally, the housing assembly comprises a pump housing and a support member mounted on the pump housing, the mounting groove is arranged on the support member, the driving mechanism further comprises a mounting seat, the mounting seat is fixedly connected to the pump housing, the mounting seat is provided with a mounting cavity and a liquid passage hole in communication with the mounting cavity, the support member is mounted in the mounting cavity, and at least one of the mounting seat and the support member is provided with a flow channel in communication with the liquid passage hole.

[0020] Optionally, the support member is provided with the flow channel, the flow channel of the support member has a first opening and a second opening, the first opening is communicated with the mounting slot, the second opening is communicated with the liquid passage hole, and the rotating head avoids the first opening.

[0021] Optionally, the support member comprises a sleeve and a bottom plate, the bottom plate is connected to one end of the sleeve, the bottom plate and the sleeve jointly enclose the mounting slot, at least part of the inner wall of the sleeve forms the side wall, and the bottom wall is arranged on the bottom plate.

[0022] Optionally, the bottom plate is provided with the flow channel communicated with the mounting slot, the flow channel of the bottom plate is formed by extending from the side of the bottom plate to the center of the bottom plate, and the rotating head avoids the flow channel of the bottom plate.

[0023] Optionally, the rotating assembly further comprises a rotating shaft and a rotor, the rotating shaft has a proximal end and a distal end, the distal end of the rotating shaft is rotatably arranged in the through hole, the rotor comprises a first rotor unit, the first rotor unit is fixedly connected to the rotating shaft, and at least one of the first rotor unit and the rotating shaft is connected to the rotating head.

[0024] Optionally, the rotating head is provided with a stop surface, the stop surface is located on the side of the rotating head away from the bottom wall of the mounting slot, the stop surface is spaced apart from the slot opening of the mounting slot by a distance, the first rotor unit abuts against the stop surface, and the first rotor unit is spaced apart from the slot opening of the mounting slot by a distance.

[0025] Optionally, the housing assembly comprises a pump housing and a shaft sleeve arranged on the pump housing, the through hole is arranged on the shaft sleeve, the driving mechanism further comprises a stopper, the stopper is fixedly connected to the rotating assembly, the stopper is located between the shaft sleeve and the rotating head, the stopper can abut against the shaft sleeve, and the movement of the rotating assembly in the direction away from the mounting slot is limited.

[0026] The embodiment of the application further provides a blood pump comprising an impeller and the driving mechanism, the impeller is connected to the rotating assembly, and the impeller can rotate with the rotating assembly.

[0027] The rotating head of the driving mechanism of the scheme abuts against the side wall and the bottom wall of the mounting groove, the first spherical wall of the rotating head is tangent to the side wall, when the rotating head rotates, the contact between the rotating head and the side wall of the mounting groove can be regarded as line and line contact, compared with the cooperation mode that the whole first spherical wall of the rotating head is in contact with the groove wall of the ball head groove, the contact area between the rotating head and the groove wall is reduced, that is, the wear area of the rotating head and the side wall is small, the wear resistance of the rotating head is better, and the service life is longer; at the same time, the contact area is small, when the rotating head is just started, the friction resistance is small, the starting torque is small, and the starting is faster. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 The structure schematic diagram of the blood pump provided by the present application is shown in the figure.

[0030] Figure 2 The structure schematic diagram of the blood pump provided by the present application is shown in the figure. Figure 1 The cross-sectional view of the blood pump omitting part of the catheter is shown in the figure.

[0031] Figure 3 The partial enlarged view of the I part is shown in the figure. Figure 2 The partial enlarged view of the I part is shown in the figure.

[0032] Figure 4 The partial enlarged view of the I part is shown in the figure. Figure 2 The partial enlarged view of the I part is shown in the figure.

[0033] Figure 5 The partial enlarged view of the I part is shown in the figure. Figure 2 The partial enlarged view of the I part is shown in the figure.

[0034] Figure 6 The partial structure enlarged view of the distal end part of the blood pump is shown in the figure. Figure 2 The structure schematic diagram of the support of the blood pump is shown in the figure.

[0035] Figure 7 The structure schematic diagram of the mounting seat of the blood pump is shown in the figure. Figure 2 The structure schematic diagram of the mounting seat of the blood pump is shown in the figure.

[0036] Figure 8 The partial structure enlarged view of the proximal end part of the blood pump is shown in the figure. Figure 2 The partial structure enlarged view of the proximal end part of the blood pump is shown in the figure.

[0037] Figure 9 The partial structure enlarged view of the proximal end part of the blood pump is shown in the figure. Figure 2 The partial structure enlarged view of the proximal end part of the blood pump is shown in the figure.

[0038] Figure 10 Fig. 1 is a schematic view of a blood pump according to the present application; Figure 2 Fig. 2 is a schematic view of a structure of a shaft sleeve in Fig. 1;

[0039] Figure 11 Fig. 3 is an enlarged view of a partial structure of a distal end portion of an embodiment two of the blood pump according to the present application;

[0040] Figure 12 Fig. 4 is a schematic view of a structure of a rotating head in Fig. 3; Figure 11 Fig. 5 is an enlarged view of a partial structure of a II part of Fig. 4;

[0041] Figure 13 Fig. 6 is an enlarged view of a partial structure of a distal end portion of an embodiment three of the blood pump according to the present application;

[0042] Figure 14 Fig. 7 is a schematic view of a structure of a rotating head in Fig. 6; Figure 13

[0043] Figure 15 Fig. 8 is a schematic view of a structure of a support in Fig. 7; Figure 13 Fig. 9 is an enlarged view of a partial structure of a support in Fig. 8 composed of a collar and a bottom plate.

[0044] Figure 16 Fig. 10 is a schematic view of a structure of a support in Fig. 7 composed of a collar and a bottom plate. Figure 13 DETAILED DESCRIPTION The embodiments of the present application will be described in detail below with reference to the drawings, wherein the same or like designations denote the same or like elements or elements having the same or similar functions throughout the description. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0045] Throughout the specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the appearance of the phrases "in one embodiment" or "in some embodiments" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0046] In the description of the present application, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like mean the orientation or positional relationship as shown in the drawings based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047]

[0048] ​​In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity of the indicated technical features. Thus, features with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0049] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connect", "connection", "fixed", and the like are to be construed as broadly as possible, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the field of interventional medicine, the end of the instrument close to the operator is usually defined as the proximal end, and the end far from the operator is usually defined as the distal end.

[0051] The driving mechanism 10 and the blood pump 1 in the embodiment of the present application will be described.

[0052] Please refer to Figure 1 The blood pump 1 comprises a driving mechanism 10 and an impeller 20, the driving mechanism 10 is in transmission connection with the impeller 20, and the driving mechanism 10 can drive the impeller 20 to rotate.

[0053] Specifically, the blood pump 1 further comprises a cannula 30, the cannula 30 is connected with the driving mechanism 10. The impeller 20 is rotatably accommodated in the cannula 30. The cannula 30 has a blood inlet 31 and a blood outlet 32. When the impeller 20 rotates, blood flows into the cannula 30 from the blood inlet 31 and then flows out from the blood outlet 32. When the blood pump 1 is used in the left ventricle, the cannula 30 extends through the heart valve, such as the aortic valve, the blood inlet 31 is located in the ventricle of the heart, and the blood outlet 32 and the driving mechanism 10 are located in the blood vessel outside the heart, such as the aorta.

[0054] Specifically, the blood pump 1 further comprises a catheter 40, the catheter 40 is connected with the driving mechanism 10. The catheter 40 is used to accommodate various supply lines. More specifically, the supply lines include an electric wire for electrically connecting with the driving mechanism 10, a signal line for electrically connecting with the sensor on the blood pump 1, and a flushing line for supplying flushing liquid to the blood pump 1. For example, the flushing liquid can be normal saline, normal saline containing heparin, or glucose, etc.

[0055] Please refer to Figures 2 to 6The driving mechanism 10 comprises a housing assembly and a rotating assembly. The housing assembly has a mounting groove 511 with a bottom wall 512 and a side wall 513, and a through hole 522. The rotating assembly has a distal end rotatably arranged in the through hole 522, and a proximal end with a rotating head 800 rotatably arranged in the mounting groove 511 and in sliding abutment with the bottom wall 512 and the side wall 513. The rotating head 800 has a first spherical wall 810 tangent to the side wall 513. The cannula 30 and the catheter 40 are fixed to the housing assembly. The rotating assembly is partially arranged in the cannula 30 and partially arranged in the housing assembly. The impeller 20 is fixed to the distal end of the rotating assembly.

[0056] The rotating head 800 of the driving mechanism is in abutment with the side wall 513 and the bottom wall 512 of the mounting groove 511, thereby limiting the proximal end of the rotating assembly. The first spherical wall 810 of the rotating head 800 is tangent to the side wall 513. When the rotating head 800 rotates, the contact between the rotating head 800 and the side wall 513 of the mounting groove 511 can be regarded as line-to-line contact. Compared with the contact between the entire first spherical wall 810 of the rotating head 800 and the groove wall of the spherical head groove, the contact area between the rotating head 800 and the groove wall of the mounting groove 511 is reduced, i.e., the wear area between the rotating head 800 and the side wall 513 is small, the wear resistance of the rotating head 800 is better, and the service life is longer. At the same time, the small contact area also reduces the frictional resistance when the rotating head 800 starts, thereby reducing the starting torque and facilitating the start.

[0057] In the illustrated embodiment, the side wall 513 is parallel to the rotation axis of the rotating assembly when the rotating assembly rotates stably. Due to the small axial movement or radial deflection that may occur during the rotation of the rotating assembly, the rotating head 800 can maintain abutment with the side wall 513 and stable radial limitation regardless of the position of the axial movement of the rotating assembly in the mounting groove 511. When the rotating assembly deflects radially, the rotating head 800 can roll in the mounting groove 511, and the first spherical wall 810 is always tangent to the side wall 513.

[0058] The stable rotation of the rotating assembly refers to a state in which the rotation axis of the rotating assembly is substantially coincident with the central axis of the housing assembly when the rotating assembly rotates.

[0059] Of course, in other embodiments, the side wall 513 can be inclined at a certain angle to the rotation axis of the rotating assembly. Specifically, the angle between the side wall 513 and the rotation axis of the rotating assembly is an acute angle, i.e., the distance between the side wall 513 and the rotation axis of the rotating assembly gradually increases away from the bottom wall 512. In this way, the rotating head 800 can be more smoothly arranged in the mounting groove 511 during assembly.

[0060] The mounting groove 511 has a certain depth, and its cross-section along the rotation axis of the vertical rotating assembly is circular. In the illustrated embodiment, the side wall 513 is cylindrical. When the rotating head 800 abuts against the side wall 513, the first spherical wall 810 is tangent to the side wall 513. That is, when the rotating head 800 rotates, the first spherical wall 810 and the side wall 513 can be considered to be in line-to-line contact, which can reduce the contact area. At the same time, when the rotating assembly wobbles radially, the cylindrical side wall 513 can be tangent to the rotating head 800 in a line-to-line contact manner whenever the rotating head 800 rolls to any position, maintaining the radial limiting effect on the rotating head 800.

[0061] In some embodiments, the cross-section of the mounting groove 511 can also be rectangular, meaning the side wall 513 is formed by four planes. When the rotating head 800 abuts against the side wall 513, the first spherical wall 810 is tangent to each of the four planes. As the rotating head 800 rotates, the first spherical wall 810 and the side wall 513 can be considered to be in point-to-point contact. This arrangement reduces the contact area, thereby reducing wear on the rotating head 800. In other embodiments, the cross-section of the mounting groove 511 can also be triangular, pentagonal, hexagonal, etc., which can also form point-to-point contact, reducing the contact area and thus reducing wear.

[0062] Please combine Figures 2 to 3 , Figure 9 and Figure 10 As shown, the housing assembly includes a pump housing 100, a support member 510, and a bushing 520.

[0063] Specifically, the pump housing 100 is generally a cylindrical structure with openings at both ends. The distal end of the pump housing 100 is fixedly connected to the insertion tube 30, and the proximal end is fixedly connected to the conduit 40.

[0064] Both the support member 510 and the bushing 520 are installed inside the pump housing 100. The support member 510 is located at the near end of the pump housing 100, and the bushing 520 is located at the far end of the pump housing 100. Both the support member 510 and the bushing 520 are fixedly connected to the pump housing 100. Specifically, a mounting groove 511 is formed in the support member 510; a through hole 522 is formed in the bushing 520.

[0065] The central axis of the through hole 522 coincides with the central axis of the mounting groove 511. The distal end of the rotating assembly is rotatably inserted through the through hole 522, and there is a gap between the wall of the through hole 522 of the bushing 520 and the rotating assembly for fluid flow. The flushing fluid entering the pump housing 100 can flow through the gap between the rotating assembly and the wall of the through hole 522 and exit the pump housing 100.

[0066] The rotating assembly further comprises a rotating shaft 300 and a rotor 400. The rotating shaft 300 has a rotation axis which coincides with the rotation axis of the rotating assembly. That is, when the rotating assembly rotates steadily, the rotation axis of the rotating shaft 300 substantially coincides with the central axis of the housing assembly. The rotating shaft 300 is rotatably installed in the pump housing 100, and has a connecting end 310 for connecting with the impeller 20 so that the impeller 20 can rotate with the rotating shaft 300. In the illustrated embodiment, the rotating shaft 300 passes through the through hole 522 of the shaft sleeve 520. The rotating shaft 300 extends substantially along the axial direction of the pump housing 100. The connecting end 310 of the rotating shaft 300 extends out of the pump housing 100 or extends into the cannula 30 to connect with the impeller 20. The rotation axis of the rotating assembly is the rotation axis of the rotating shaft 300. The rotor 400 is arranged in the pump housing 100, and is fixedly connected with the rotating shaft 300.

[0067] The driving mechanism further comprises a stator 200 arranged in the pump housing 100. The stator 200 can drive the rotating assembly to rotate. In the illustrated embodiment, the stator 200 is located between the support 510 and the shaft sleeve 520.

[0068] The stator 200 can drive the rotor 400 to rotate, and the rotor 400 can drive the rotating shaft 300 to rotate. Specifically, the rotor 400 has magnetism, and the stator 200 can generate a rotating magnetic field to drive the rotor 400 to rotate. The rotating shaft 300 rotatably passes through the stator 200. The rotor 400 is located between the support 510 and the shaft sleeve 520.

[0069] Please refer to the above description again Figure 2 In the illustrated embodiment, the rotor 400 comprises a first rotor unit 410 and a second rotor unit 420, and the first rotor unit 410 and the second rotor unit 420 are both fixedly connected with the rotating shaft 300. The first rotor unit 410 and the second rotor unit 420 are arranged along the axis of the rotating shaft 300. The stator 200 is located between the first rotor unit 410 and the second rotor unit 420. The first rotor unit 410 and the second rotor unit 420 both have magnetism, and the stator 200 can generate a rotating magnetic field to drive the first rotor unit 410 and the second rotor unit 420 to rotate. At least one of the rotating shaft 300 and the first rotor unit 410 is connected with the rotating head 800. In the illustrated embodiment, the rotating head 800 is fixedly connected with the end of the rotating shaft 300 which is away from the connecting end 310.

[0070] The rotating head 800 and the rotating shaft 300 can be separate components. The rotating head 800 can be fixed to the rotating shaft 300 and the first rotor unit 410 by welding, bonding, or other methods. In some embodiments, the rotating head 800 and the rotating shaft 300 can also be integrally formed, which is convenient for processing and shaping. Alternatively, in other embodiments, the rotating head 800 may not be directly connected to the rotating shaft 300; for example, the rotating head 800 may be connected to the first rotor unit 410.

[0071] The drive mechanism also includes a stop 600, which is fixed to the rotating assembly. The stop 600 is located between the bushing 520 and the rotating head 800. The stop 600 can abut against the bushing 520 to restrict the movement of the rotating assembly away from the mounting groove 511.

[0072] Please combine Figure 9 and Figure 10 As shown, specifically, the stop 600 is fixed to at least one of the rotating shaft 300 and the rotor 400 (specifically, the second rotor unit 420). In other words, the stop 600 can be directly fixed only to the rotor 400, only to the rotating shaft 300, or directly fixed to both the rotor 400 and the rotating shaft 300. Since the rotor 400 is fixed to the rotating shaft 300, the stop 600, the rotating shaft 300, and the rotor 400 rotate and move synchronously. The stop 600 is located between the rotor 400 and the bushing 520, and the stop 600 can abut against the bushing 520 to restrict the movement of the rotating shaft 300 along the axis of the rotating shaft 300 in a direction away from the mounting groove 511.

[0073] In the illustrated embodiment, the stop 600 and the rotating shaft 300 are integrally formed. Since the overall volume of the blood pump 1 is small, the volume of the stop 600 is even smaller, the machining accuracy is difficult, and the assembly is difficult. Integrating the stop 600 and the rotating shaft 300 into one piece facilitates installation and eliminates the need for fixing operations.

[0074] Specifically, the stop 600 is approximately annular, and its central axis coincides with the axis of the rotating shaft 300. The stop 600 has a stop surface 610, which is arc-shaped to reduce the contact area with the bushing 520, thus reducing wear on both. When the stop surface 610 abuts against the bushing 520, it restricts the movement of the rotating shaft 300 along its axis towards the impeller 20.

[0075] The one side of the shaft sleeve 520 facing the stopper 600 is partially recessed to form a flow guide groove 524, and the flow guide groove 524 is in communication with the through hole 522 of the shaft sleeve 520; when the stopper 600 abuts against the shaft sleeve 520, part of the flow guide groove 524 is not covered by the stopper 600, so that even if there is a problem of flow obstruction of the flushing liquid caused by the stopper 600 blocking the gap between the through hole 522 of the shaft sleeve 520 and the shaft 300 when the stopper 600 abuts against the shaft sleeve 520, the flow guide groove 524 not covered by the stopper 600 can realize fluid communication when the stopper 600 abuts against the shaft sleeve 520, thereby ensuring the smoothness of the flushing liquid flow. In addition, the flow guide groove 524 is formed by partially recessing the one side of the shaft sleeve 520 facing the stopper 600, so that the flushing liquid can flow better into the space between the stopper 600 and the shaft sleeve 520, thereby playing a lubricating role on the contact surface of the stopper 600 and the shaft sleeve 520, reducing the friction between the stopper 600 and the shaft sleeve 520, and reducing the wear problem caused by the friction between the stopper 600 and the shaft sleeve 520.

[0076] In the illustrated embodiment, the flow guide groove 524 is provided with three rows, and the three rows of flow guide grooves 524 are in communication with the through hole 522 and are uniformly distributed with respect to the through hole 522. The presence of the three rows of flow guide grooves 524 can first introduce more flushing liquid, better lubricate the contact surface of the stop surface 610 and the shaft sleeve 520, reduce friction, and at the same time reduce the contact area of the shaft sleeve 520 and the stop surface 610, thereby reducing wear.

[0077] Of course, in other embodiments, the number of flow guide grooves 524 can also be one, two or more than three, which is not limited herein.

[0078] The following embodiments specifically describe the structure of the rotating head 800:

[0079] Embodiment one: combined with Figure 3As shown, the rotating head 800 comprises a spherical head 800a which is rotatably arranged in the mounting groove 511 and is in sliding abutment with the bottom wall 512 and the side wall 513 respectively. In the illustrated embodiment, a first spherical surface 810 of the spherical head 800a is tangent to both the bottom wall 512 and the side wall 513. The side wall 513 of the mounting groove 511 is a cylindrical surface, and the bottom wall 512 is a flat surface which is perpendicular to the side wall 513. The first spherical surface 810 is at least a half-spherical surface of a sphere in which the first spherical surface 810 is located, so that the volume of the spherical head 800a is at least half of the volume of the sphere in which the first spherical surface 810 is located. The tangent point at which the first spherical surface 810 is tangent to the side wall 513 is located on the cross section of the spherical head 800a with the largest diameter, and the diameter of the largest cross section is equal to the diameter of the sphere in which the spherical head 800a is located. Thus, when the rotating head 800 rotates, the first spherical surface 810 is in line-to-line contact with the side wall 513, so that the contact is less and the abrasion is reduced. The tangent point at which the first spherical surface 810 is tangent to the bottom wall 512 can be regarded as point-to-point contact, so that the friction and abrasion with the bottom wall 512 are reduced. In addition, the abutment of the spherical head 800a with the bottom wall 512 can also achieve axial positioning of the proximal end of the rotating assembly, and the spherical head 800a is accommodated in the mounting groove 511 and is stably radially positioned, so that the rolling of the spherical head 800a in the mounting groove 511 is smoother.

[0080] In the present embodiment, the volume of the spherical head 800a is greater than half of the volume of the sphere in which the first spherical surface 810 is located, so that the contact of the angle formed at the junction of the face of the spherical head 800a which is away from the bottom wall 512 of the mounting groove 511 and the first spherical surface 810 with the side wall 513 of the mounting groove 511 is avoided as much as possible, so that the side wall 513 of the mounting groove 511 is not scratched and abraded.

[0081] More specifically, the mounting groove 511 further has a slot 514 and an arc wall 513a, the rotating head 800 is arranged in the slot 514, the arc wall 513a is arranged close to the edge of the slot 514 and extends away from the central axis of the slot 514, and the side wall 513 is connected to the arc wall 513a and the bottom wall 512. In the embodiment, the arc wall 513a is a rounded structure arranged at the edge of the slot 514. During rotation of the rotating assembly, the distal end of the rotating assembly will vibrate, which will cause the rotating head 800 at the proximal end of the rotating assembly to swing radially, and the rotating head 800 will swing away from the rotation axis of the rotating assembly rotating stably, which will cause the rotating head 800 to be stuck in the mounting groove 511. The arc wall 513a (rounded structure) arranged at the slot 514 can relatively expand the caliber of the slot 514 and make the wall smooth, which can provide space for the rotating head 800 to swing radially, reduce the risk of the rotating head 800 being stuck, and also reduce the risk of the rotating head 800 being scratched and worn by the edge of the opening of the mounting groove which is not rounded when the rotating head 800 swings radially.

[0082] In combination Figure 3 As shown in the figure, when the rotating assembly rotates stably, the distance between the tangent point A at which the first spherical wall 810 is tangent to the side wall 513 and the connecting line of the side wall 513 and the bottom wall 512 is 60%-75% of the distance between the slot 514 and the connecting line of the side wall 513 and the bottom wall 512. Specifically, the tangent point A at which the first spherical wall 810 is tangent to the side wall 513 is the abutting point of the spherical head 800a and the side wall 513. By arranging the abutting point in the above manner, the risk of the rotating head 800 moving axially and coming out of the mounting groove 511 during rotation can be reduced.

[0083] In the embodiment, the bottom wall 512 is a plane, the bottom wall 512 is perpendicular to the side wall 513, and the first spherical wall 810 is tangent to the bottom wall 512 and the side wall 513 respectively. Therefore, the distance between the tangent point A at which the first spherical wall 810 is tangent to the side wall 513 and the connecting line of the side wall 513 and the bottom wall 512 is the radius of the sphere in which the spherical head 800a is located, defined as L; the distance between the slot 514 and the connecting line of the side wall 513 and the bottom wall 512 is the depth of the mounting groove 511, defined as L1, and therefore 60%≤L / L1≤75%.

[0084] Specifically, the distance between the tangent point A, at which the first spherical wall 810 is tangent to the side wall 513, and the connecting line of the side wall 513 and the arc wall 513a is 0.01mm-0.015mm. The distance between the connecting line of the side wall 513 and the arc wall 513a and the connecting line of the side wall 513 and the bottom wall 512 is defined as L2, i.e. the difference between L2 and L is 0.01mm-0.015mm. In this way, on the one hand, the installation groove 511 can have a more appropriate depth, and on the other hand, the risk of the rotating head 800 moving out of the installation groove 511 can be reduced; in addition, the risk of the rotating head 800 moving out of abutment with the side wall 513 of the installation groove 511 can be reduced.

[0085] In combination Figure 4 As shown, the ball head 800a is rotatably accommodated in the installation groove 511, and the radius of the sphere in which the ball head 800a is located is not greater than the depth of the installation groove 511, so that the ball head 800a is completely placed in the installation groove 511, which can increase the stability of the rotation of the ball head 800a.

[0086] The rotating head 800 further comprises a rod portion 850 connected with the ball head 800a, and the rod portion 850 is arranged in the slot opening 514 of the installation groove 511. Specifically, one end of the rod portion 850 away from the ball head 800a is connected with the rotating shaft 300 or the first rotor unit 410. In the illustrated embodiment, one end of the rod portion 850 away from the ball head 800a is fixedly connected with the rotating shaft 300 (specifically, one end of the rotating shaft 300 away from the connecting end 310). In this embodiment, the rod portion 850 is a columnar segment similar to the rotating shaft 300, and the rotating shaft 300, the rod portion 850 and the ball head 800a are integrally formed.

[0087] In order to further reduce the risk of the rotating head 800 being stuck and colliding with the edge of the slot opening 514 of the installation groove 511 when the rotating head 800 is radially deflected, one end of the rod portion 850 close to the ball head 800a forms an avoiding segment 820, the avoiding segment 820 is arranged in the slot opening 514 of the installation groove 511, and the width of the cross section of the avoiding segment 820 in the direction perpendicular to the rotation axis of the rotating shaft 300 is smaller than the diameter of the sphere in which the ball head 800a is located. The rotation axis of the rotating shaft 300 is the rotation axis of the rotating assembly.

[0088] In the state when the rotating assembly is not started, the cross section of the side wall 513 in the direction of the axis of the rotating shaft 300 is parallel to the rotation axis of the rotating shaft 300, and the diameter of the sphere in which the ball head 800a is located is the width of the installation groove 511; in this embodiment, the diameter of the sphere in which the ball head 800a is located is defined as R1, i.e. the width of the installation groove 511, and the diameter of the avoiding segment 820 is defined as R2, so R1

[0089] When the rotating assembly is in a state of deflection, the ball head 800a can roll in the mounting groove 511, and the diameter of the avoiding section 820 is smaller than the width of the mounting groove 511, so that the distance between the rod portion 850 and the notch 514 is increased during the deflection, the rod portion 850 can have a larger deflection angle, the upper limit of the deflection angle is improved, and a larger radial deflection distance can be adapted.

[0090] Further, under the condition of adapting to the deflection, the diameter of the avoiding section 820 cannot be too small, otherwise the part is too thin and the strength is not enough to be easily broken, and the diameter of the avoiding section 820 is set to be in the range of 75%-85% of the diameter of the sphere in which the ball head 800a is located, that is, 75%≤R1 / R2≤85%, so that in the range of the conditions, the avoiding section 820 not only has the effect of adapting to the deflection and reducing the risk of knocking against the edge of the notch 514, but also can make the strength of the avoiding section 820 meet the requirements.

[0091] In combination Figure 5 As shown in the drawings, the avoiding section 820 also has a certain axial length in the direction of the rotation axis of the rotating shaft 300, and the distance from the end of the avoiding section 820 away from the ball head 800a to the end of the ball head 800a away from the avoiding section 820 is not less than the depth of the mounting groove 511. In the embodiment, the depth of the mounting groove 511 is defined as L4, the rotating shaft 300 is connected to the first rotor unit 410, the rod portion 850 is also connected to the first rotor unit 410, the avoiding section 820 is arranged between the first rotor unit 410 and the support 510, the avoiding section 820 extends from the mounting groove 511 to the first rotor unit 410 and has a certain length. The distance from the end of the avoiding section 820 away from the ball head 800a to the end of the ball head 800a away from the avoiding section 820 is defined as L3, so that L3>L4, and thus when the ball head 800a abuts against the bottom wall 512 of the mounting groove 511, the farthest end of the avoiding section 820 away from the bottom wall 512 is higher than the position of the notch 514, so that the rotating shaft 300 is not easy to knock against the edge of the notch 514 when it is deflected to the maximum angle, and the risk of being stuck of the rotating head 800 is reduced.

[0092] Specifically, due to L3>L4, the avoidance section 820 partially protrudes from the mounting groove 511, i.e., the rod portion 850 protrudes from the mounting groove 511, so that the length of the entire rotating head 800 in the axial direction of the rotating shaft 300 is greater than the depth of the mounting groove 511. Specifically, in the illustrated embodiment, the side of the rod portion 850 away from the rotating head 800 forms a stop surface 860; the first rotor unit 410 is provided with a first shaft hole 411, and part of the rod portion 850 is sleeved in the first shaft hole 411, and the stop surface 860 abuts against the side of the first rotor unit 410 close to the support 510. Again, due to the protrusion of the rod portion 850 from the mounting groove 511, the rod portion 850 is located between the first rotor unit 410 and the support 510, and the first rotor unit 410 is spaced apart from the slot opening 514 of the mounting groove 511 by a certain distance, so as to avoid interference and friction between the first rotor unit 410 and the support 510 during rotation. In Figure 5 In the illustrated embodiment, the avoidance section 820 is located between the stop surface 860 and the ball head portion 800a.

[0093] It should be noted that in Embodiment I described above, the arc surface wall 513a can be provided only at the slot opening 514, or the avoidance section 820 can be provided only on the rotating head 800, or both can be provided, which is not limited herein.

[0094] Furthermore, in other embodiments, the bottom surface wall 512 can also be a curved surface wall. Specifically, the bottom surface wall 512 is an outward convex or inward concave arc surface; when the bottom surface wall 512 is an outward convex arc surface, the rotating head 800 abuts against the outward convex arc surface, and the first spherical surface wall 810 is tangent to the outward convex arc surface; or when the bottom surface wall 512 is an inward concave arc surface, the rotating head 800 abuts against the inward concave arc surface, and the first spherical surface wall 810 is tangent to the inward concave arc surface; or when the bottom surface wall 512 is an outward convex arc surface, the side of the rotating head 800 facing the bottom surface wall is a plane wall, which can also be tangent to the outward convex arc surface of the bottom surface wall 512.

[0095] Please refer to Figure 6 , Figure 7 and Figure 8 together, the drive mechanism 10 further comprises a mounting seat 700, which is fixedly connected to the pump shell 100. The mounting seat 700 is provided with a mounting cavity 710 and a liquid passage hole 720 communicating with the mounting cavity 710, and the support 510 is mounted in the mounting cavity 710. The mounting seat 700 is provided with a flow channel. In this embodiment, the flow channel is a first flow channel 730, which communicates with the liquid passage hole 720, so that the flushing liquid flowing through the liquid passage hole 720 can flow into the inner cavity of the pump shell 100 through the first flow channel 730. Among them, the end of the liquid passage hole 720 away from the mounting cavity 710 is used to communicate with the flushing pipeline of the catheter 50, so that the flushing liquid can flow into the inner cavity of the pump shell 100 through the liquid passage hole 720 and the first flow channel 730.

[0096] Specifically, one end of the first flow channel 730 is communicated with the gap between the support 510 and the cavity bottom 712 of the mounting cavity 710, and the other end is communicated with the inner cavity of the pump housing 100. In the illustrated embodiment, the first flow channel 730 is formed by partially recessing the cavity wall of the mounting cavity 710. In the illustrated embodiment, the number of first flow channels 730 is two, and the two first flow channels 730 are oppositely arranged. It can be understood that the number of first flow channels 730 can be adjusted according to design needs, for example, in some embodiments, the number of first flow channels 730 can also be one or more than two.

[0097] Specifically, the mounting cavity 710 has a cavity bottom 712, one opening of the liquid passage hole 720 is located at the cavity bottom 712 of the mounting cavity 710, and a support step 713 is arranged in the mounting cavity 710. The support step 713 abuts against the support 510, so that the support 510 is spaced apart from the cavity bottom 712 by a distance, so as to better ensure the smoothness of the flow of the flushing liquid. The support 700 is installed in the mounting cavity 710, and the support step 713 abuts against the side of the support 510 away from the shaft sleeve 520.

[0098] Embodiment two: Embodiment two is substantially the same as embodiment one, and the difference from the above-mentioned embodiment one is the structure of the rotating head 800 and the structure of the mounting groove 511.

[0099] In combination Figure 11 And 12 As shown, the rotating head 800 includes a ball head part 800a, the ball head part 800a is arranged in the slot 514, and the ball head part 800a respectively abuts against the bottom wall 512 and the side wall 513. Specifically, in the illustrated embodiment, the first spherical wall 810 of the ball head part 800a is tangent to both the side wall 513 and the bottom wall 512. The side wall 513 of the mounting groove 511 is a cylindrical surface, and the bottom wall 512 is a flat surface, and the bottom wall 512 is perpendicular to the side wall 513. The caliber of the slot 514 of the mounting groove 511 is less than or equal to the diameter of the sphere in which the ball head part 800a is located, so that part of the ball head part 800a is located outside the slot 514, so that at least part of the first spherical wall 810 is also located outside the slot 514. Therefore, the ball head part 800a is not completely limited in the radial direction by the side wall 514. In this way, when the rotating assembly is deflected, the first spherical wall 810 can slide in the mounting groove 511, and the first spherical wall 810 can slide along the slot 514. The ball head part 800a is not limited by the slot 514 of the mounting groove 511, thereby avoiding being stuck.

[0100] In the embodiment, the volume of the ball head 800a is greater than half of the sphere in which the first spherical wall 810 is located, the tangent point B at which the first spherical wall 810 is tangent to the side wall 513 is lower than the cross section of the maximum diameter of the ball head 800a, that is, the tangent point B is lower than the radius of the sphere in which the ball head 800a is located in the axial direction; and the caliber of the slot mouth 514 of the mounting groove 511 is smaller than the diameter of the sphere in which the ball head 800a is located. In this way, the contact between the angle formed by the connection between the surface of the ball head 800a away from the bottom wall 512 of the mounting groove 511 and the first spherical wall 810 and the side wall 513 of the mounting groove 511 is avoided as much as possible, and the abrasion and wear of the side wall 513 of the mounting groove 511 are avoided. In addition, the volume of the ball head 800a in the mounting groove 511 is less than half of the volume of the sphere in which the first spherical wall 810 is located, and when the rotating assembly is deflected, the first spherical wall 810 slides more smoothly in the mounting groove 511, and the risk of being stuck by the slot mouth 514 is smaller.

[0101] Specifically, the diameter of the sphere in which the ball head 800a is located is defined as R3, the caliber of the slot mouth 514, that is, the width of the mounting groove 511, is defined as R4, the radius of the sphere in which the ball head 800a is located is defined as r3, and the depth of the mounting groove 511 is defined as L5, that is, R3>R4, r3>L5. In addition, in the illustrated embodiment, the volume of the ball head 800a is relatively large in the mounting groove 511, and when the abrasion occurs between the bottom wall 512 and the side wall 513, the pressure points are dispersed on the ball head 800a, so that the anti-abrasion effect is good, and the service life is long.

[0102] In addition, the caliber of the slot mouth 514 of the mounting groove 511 is not less than 1 / 2 of the diameter of the sphere in which the ball head 800a is located, that is, the minimum range of the caliber of the slot mouth 514 is limited. If the caliber of the slot mouth 514 is too small, the depth and width of the rotating head 800 placed in the mounting groove 511 are also too small, the axial or radial limiting ability of the rotating head 800 at high speed is too weak, and the rotating head 800 is easy to be separated from the mounting groove 514.

[0103] In combination Figure 12 As shown, the rotating head 800 is provided with a stop surface 860 located on the side of the rotating head 800 away from the bottom wall 512 of the mounting groove 511, and the stop surface 860 is spaced apart from the slot mouth 514 of the mounting groove 511 by a distance. The first rotor unit 410 abuts against the stop surface 860, so that the first rotor unit 410 is spaced apart from the slot mouth 514 of the mounting groove 511 by a distance.

[0104] In the embodiment, the rotating head 800 comprises a rod part 850 connected with the spherical head part 800a. Specifically, the rod part 850 is arranged separately from the rotating shaft 300, one end of the rod part 850 away from the spherical head part 800a is fixedly connected with the first rotor unit 410, and one end of the rotating shaft 300 away from the connecting end 310 is also fixedly connected with the first rotor unit 410. In the illustrated embodiment, the first rotor unit 410 is provided with a first shaft hole 411, and the rod part 850 and the rotating shaft 300 are respectively sleeved in the first shaft hole 411. At this time, the stopper 600 can be integrally formed with the rotating shaft 300, and the machining precision is good, so that the rotating shaft 300 can be assembled from the distal end direction of the first shaft hole 411.

[0105] Specifically, the width of the cross section of the rod part 850 in the direction perpendicular to the rotation axis of the rotating shaft 300 is smaller than the diameter of the sphere in which the spherical head part 800a is located, and a stop surface 860 is formed between the rod part 850 and the spherical head part 800a, the stop surface 860 abuts against one side of the first rotor unit 410 facing the support 510, and has a limiting effect on the rotating head 800 during assembly. The first rotor unit 410 is spaced apart from the notch 514 of the mounting groove 511 by a certain distance, and can also space apart the support 510 and the first rotor unit 410, effectively avoiding interference and friction between the first rotor unit 410 and the support 510 during rotation.

[0106] Embodiment three: Embodiment three is substantially the same as embodiment two, and the difference from the above-mentioned embodiment two lies in the structure of the rotating head 800 and the structure of the support 510.

[0107] In combination Figures 13 to 15 As shown, the rotating head 800 also has a second spherical surface wall 840 connected to the first spherical surface wall 810, and the rotating head 800 is in sliding abutment with the side wall 513 and the bottom wall 512. Specifically, the first spherical surface wall 810 is tangent to the side wall 513, and the second spherical surface wall 840 is tangent to the bottom wall 512, and the second spherical surface wall 840 is arranged towards the bottom wall 512.

[0108] Specifically, the side of the rotating head 800 facing the bottom wall 512 is provided with a convex ring 830, the central axis of the convex ring 830 coincides with the rotation center axis of the rotating assembly, and the second spherical surface wall 840 is arranged on the convex ring 830. In the embodiment, the second spherical surface wall 840 is an outer convex curved surface arranged around the convex ring 830, when the convex ring 830 abuts against the bottom wall 512, the second spherical surface wall 840 is just tangent to the bottom wall 512. In this way, the contact between the bottom wall 512 and the rotating head 800 can be regarded as line-to-line contact, reducing friction and wear. Moreover, since the convex ring 830 is circumferentially arranged, the contact area with the bottom wall 512 is relatively dispersed and uniform, so that the pressure of the relative friction part is not too concentrated, further reducing wear, and improving the service life of the rotating head 800.

[0109] More specifically, the inner diameter of the convex ring 830 is not less than half the diameter of the sphere containing the first spherical wall 810. With this configuration, when the second spherical wall 840 on the convex ring 830 is tangent to the bottom wall 512, the circumference of the circle formed by the convex ring 830 is relatively large, which disperses the pressure of the convex ring 830 on the bottom wall 512, preventing it from becoming too concentrated and resulting in better wear resistance.

[0110] Furthermore, in other embodiments, instead of providing the convex ring 830, multiple convex spheres can be evenly arranged circumferentially along the rotation center axis of the rotating assembly, with the second spherical wall 840 disposed on the convex spheres, achieving the same effect. The number of convex spheres can also be three, four, or more.

[0111] It should be noted that the convex ring 830 structure in this embodiment 3 can also be applied to embodiment 1, and is not limited here.

[0112] Combination Figure 13 and 15 As shown, in this embodiment, the support member 510 has a flow channel, which is a second flow channel 516. The second flow channel 516 on the support member 510 has a first opening 515 and a second opening 517. The first opening 515 communicates with the mounting groove 511, and the second opening 517 communicates with the liquid passage hole 720. The rotating head 800 avoids the first opening 515. Specifically, one end of the second flow channel 516 is connected to the gap between the support member 510 and the bottom 712 of the mounting cavity 710, and the other end is connected to the mounting groove 511. The flushing fluid can flow into the mounting groove 511 through the liquid passage hole 720, the second opening 517, the second flow channel 516, and the second opening 515. The flushing fluid entering the mounting groove 511 and the rotating head 800 can play a role in lubrication and heat dissipation, thereby reducing the friction between the rotating head 800 and the mounting groove 511 and dissipating the generated heat, thus reducing the wear between the rotating head 800 and the mounting groove 511. Furthermore, the rotating head 800 will not cover the first opening 515, ensuring unobstructed entry of the flushing fluid, and will not come into contact with the edge of the first opening 515, thus avoiding wear. In the illustrated embodiment, there are two second flow channels 516, which are arranged opposite to each other. It is understood that the number of second flow channels 516 can be adjusted according to design needs; for example, in some embodiments, the number of second flow channels 516 may be one or more than two.

[0113] It should be noted that the first flow channel 730 on the mounting base 700 and the second flow channel 516 on the support member 510 can be set simultaneously or only one of them can be set; when both are set simultaneously, the flushing liquid enters the mounting cavity 710 from the liquid passage 720 and is divided into two streams, one of which flows into the mounting groove 511 of the support member 510 through the second flow channel 516, and the other flows out through the first flow channel 730.

[0114] In addition, the support 510 can be integrally formed or composed of two parts. Figure 15 and Figure 16 As shown in FIGS. 5 and 6, when the support 510 is composed of two parts, the support 510 includes a sleeve 518 and a bottom plate 519 connected to one end of the sleeve 518, the bottom plate 519 and the sleeve 518 together define the mounting slot 511, at least part of the inner wall of the sleeve 518 forms the side wall 513, and the bottom wall 512 is arranged on the bottom plate 519.

[0115] Specifically, the sleeve 518 and the bottom plate 519 can be bonded or abutted, and the first is that the machining is better and the material selection is more flexible when machining, and the same material such as ceramic material can be used for both, or different materials such as ceramic material for the sleeve 518 and metal for the bottom plate 519 can be used, and a diamond coating needs to be coated on the surface of the bottom plate 519 to improve the surface roughness; the second is that the rotary head 800 can enter from two axial directions of the sleeve 518 when assembling, which is more convenient.

[0116] When the support 510 is composed of two parts, the second flow channel 516 is arranged on the bottom plate 519, the second flow channel 516 is a gap formed by extending from the side wall of the bottom plate 519 to the center of the bottom plate 519, the second flow channel 516 is in communication with the liquid passage 720, and the rotary head 800 avoids the second flow channel 516; or in other embodiments, the second flow channel 516 is arranged on the sleeve 518, the second flow channel 516 is a gap formed by extending from the side wall of the sleeve 518 to the center of the sleeve 518, the second flow channel 516 is in communication with the liquid passage 720, and the rotary head 800 avoids the second flow channel 516.

[0117] It should be noted that the structure of the support 510 in the third embodiment can also be applicable to the first and second embodiments, which is not limited herein.

[0118] The above are only the preferred embodiments of the present application, and are not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A drive mechanism characterized by, The driving mechanism comprises: a housing assembly having a mounting groove and a through hole, the mounting groove having a bottom wall and a side wall; a stator arranged in the housing assembly; and a rotating assembly having a distal end and a proximal end, the distal end of the rotating assembly being rotatably arranged in the through hole, the stator being capable of driving the rotating assembly to rotate; wherein the proximal end of the rotating assembly has a rotating head, the rotating head being rotatably arranged in the mounting groove and being in sliding abutment with the bottom wall and the side wall, the rotating head having a first spherical wall, the first spherical wall being tangent to the side wall; when the rotating assembly is in a rotating state and radial deflection occurs, the rotating head is capable of rolling in the mounting groove, and the first spherical wall is always tangent to the side wall; the rotating head comprises a spherical head portion and a rod portion connected to the spherical head portion, the spherical head portion being rotatably accommodated in the mounting groove, and the spherical head portion being completely arranged in the mounting groove; the mounting groove further has a slot and an arc wall, the rotating head being arranged in the slot, the side wall connecting the arc wall and the bottom wall, and the arc wall being close to the slot; a distance from a tangent point of the first spherical wall to the side wall to a connecting line of the side wall and the arc wall is 0.01mm-0.015mm.

2. The drive mechanism of claim 1, wherein: the rod portion is a columnar segment, the rod portion being arranged in the slot of the mounting groove, and a width of a section of the rod portion in a direction perpendicular to a rotating axis of the rotating assembly being smaller than a diameter of a sphere in which the spherical head portion is located.

3. The drive mechanism of claim 2, wherein: an end of the rod portion close to the spherical head portion forms an avoiding segment, the avoiding segment being arranged in the slot of the mounting groove, and a width of a section of the avoiding segment in a direction perpendicular to the rotating axis of the rotating assembly being smaller than the diameter of the sphere in which the spherical head portion is located.

4. The drive mechanism of claim 3, wherein: the width of the section of the avoiding segment in the direction perpendicular to the rotating axis of the rotating assembly is 75%-85% of the diameter of the sphere in which the spherical head portion is located; and / or, a distance from an end of the avoiding segment away from the spherical head portion to an end of the spherical head portion away from the avoiding segment is greater than a depth of the mounting groove, so that the avoiding segment partially protrudes out of the mounting groove.

5. The drive mechanism of claim 1, wherein: the side wall is a cylindrical surface, and a section of the mounting groove in a direction perpendicular to the rotating axis of the rotating assembly is circular; alternatively, the section of the mounting groove in the direction perpendicular to the rotating axis of the rotating assembly is rectangular.

6. The drive mechanism of claim 1, wherein: the side wall is parallel to the rotating axis of the rotating assembly.

7. The drive mechanism of claim 1, wherein: the first spherical wall is tangent to the bottom wall, and / or the bottom wall is a plane, and the bottom wall is perpendicular to the side wall.

8. The drive mechanism of claim 1, wherein: the rotating assembly further comprises a rotating shaft and a rotor, the rotating shaft being arranged in the stator, the rotating shaft having a proximal end and a distal end, the distal end of the rotating shaft being rotatably arranged in the through hole, the rotor comprising a first rotor unit, the first rotor unit being fixedly connected to the rotating shaft, and an end of the rod portion away from the spherical head portion being connected to the rotating shaft or the first rotor unit.

9. The drive mechanism of claim 1, wherein: The distance from the tangent point of the first spherical wall and the side wall to the connecting line of the side wall and the bottom wall is 60%-75% of the distance from the notch to the connecting line of the side wall and the bottom wall.

10. The drive mechanism of claim 1, wherein: The bottom wall is convex or concave.

11. The drive mechanism of claim 1, wherein: The rotating assembly further comprises a rotating shaft and a rotor, the rotor is fixedly connected with the rotating shaft, and the stator can drive the rotor to rotate; the rotating shaft, the rod portion and the ball head portion are integrally formed.

12. The drive mechanism of claim 1, wherein: The first spherical wall is at least half of the spherical surface of the sphere where the first spherical wall is located.

13. The drive mechanism of claim 1, wherein: The arc wall is a rounding structure arranged at the edge of the notch.

14. The drive mechanism of any one of claims 1-13, wherein: The housing assembly comprises a pump housing and a support member mounted on the pump housing, the mounting groove is arranged on the support member, the driving mechanism further comprises a mounting seat, the mounting seat is fixedly connected with the pump housing, the mounting seat is provided with a mounting cavity and a liquid passage hole communicating with the mounting cavity, the support member is mounted in the mounting cavity, at least one of the mounting seat and the support member is provided with a flow channel, and the flow channel communicates with the liquid passage hole; The flow channel is arranged on the support member, the flow channel on the support member has a first opening and a second opening, the first opening communicates with the mounting groove, and the second opening communicates with the liquid passage hole; the rotating head avoids the first opening.

15. The drive mechanism of claim 14, wherein: The support member comprises a sleeve ring and a bottom plate, the bottom plate is connected to one end of the sleeve ring, the bottom plate and the sleeve ring jointly enclose the mounting groove, at least part of the inner wall of the sleeve ring forms the side wall, and the bottom wall is arranged on the bottom plate. The bottom plate is provided with the flow channel which communicates with the mounting groove, the flow channel on the bottom plate is formed by extending from the side of the bottom plate to the center of the bottom plate, and the rotating head avoids the flow channel on the bottom plate.

16. The drive mechanism of claim 1, wherein: The rotating assembly further comprises a rotating shaft and a rotor, the rotating shaft is arranged in the stator, the rotating shaft has a proximal end and a distal end, the distal end of the rotating shaft is rotatably arranged in the through hole, the rotor comprises a first rotor unit, the first rotor unit is fixedly connected with the rotating shaft, and at least one of the first rotor unit and the rotating shaft is connected with the rotating head.

17. The drive mechanism of claim 16, wherein: The rotating head is provided with a stop surface, the stop surface is located on the side of the rotating head away from the bottom wall of the mounting groove, the stop surface is spaced apart from the notch of the mounting groove by a distance, the first rotor unit abuts against the stop surface, so that the first rotor unit is spaced apart from the notch of the mounting groove by a distance; The rod portion is a columnar segment, one end of the rod portion close to the ball head portion forms an avoiding segment, the avoiding segment is arranged in the notch of the mounting groove, the width of the cross section of the rod portion in the direction perpendicular to the rotating axis of the rotating assembly is smaller than the diameter of the sphere where the ball head portion is located, the stop surface is arranged between the avoiding segment and the ball head portion.

18. The drive mechanism of any one of claims 1-13, wherein: The shell assembly comprises a pump shell and a shaft sleeve mounted on the pump shell, the through hole is arranged on the shaft sleeve, the driving mechanism further comprises a stopper, the stopper is fixedly connected with the rotating assembly, the stopper is located between the shaft sleeve and the rotating head, and the stopper can abut against the shaft sleeve to limit the movement of the rotating assembly away from the mounting groove.

19. A blood pump, characterized by: The blood pump comprises a pump shell, a shaft sleeve mounted on the pump shell, a rotating head mounted on the shaft sleeve, a driving mechanism arranged in the pump shell and connected with the rotating head, and a rotating assembly arranged in the rotating head and connected with the driving mechanism.

20. The blood pump of claim 19, wherein: The blood pump is designed to be inserted into a blood vessel of a patient percutaneously; the blood pump further comprises a cannula connected with the driving mechanism; the impeller is rotatably accommodated in the cannula; and the cannula has a blood inlet and a blood outlet.

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