CN215025223U

CN215025223U - Blood pump

Info

Publication number: CN215025223U
Application number: CN202023142986.6U
Authority: CN
Inventors: 余顺周
Original assignee: Shenzhen Core Medical Technology Co Ltd
Current assignee: Shenzhen Core Medical Technology Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-12-07
Anticipated expiration: 2030-12-22

Abstract

The utility model provides a blood pump, which comprises a sleeve, an impeller arranged in the sleeve and a driving unit for rotating the impeller, wherein the sleeve is provided with a blood flow inlet and a blood flow outlet; the driving unit comprises a shell, a rotor and a stator, wherein the rotor and the stator are arranged in the shell; characterized in that the rotor further comprises at least two magnets arranged on the rotating shaft; the stator comprises a first stator and a second stator which are arranged around the rotating shaft, the first stator and the second stator are arranged at intervals along the axial direction, a rotating magnetic field generated by the first stator interacts with one of the two magnets to enable the rotating shaft to rotate, and a rotating magnetic field generated by the second stator interacts with the other of the two magnets to enable the rotating shaft to rotate. The utility model discloses a blood pump can increase its drive unit's output and load torque on the basis of the whole radial dimension who reduces the blood pump.

Description

Blood pump

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a blood pump in percutaneous insertion patient's blood vessel.

Background

Intravascular blood pumps, designed for percutaneous insertion into a patient's blood vessel, such as the blood vessels of the arteries or veins of the thigh or armpit, may be advanced into the patient's heart to function as either a left ventricular assist device or a right ventricular assist device. Accordingly, intravascular blood pumps may also be referred to as intracardiac blood pumps.

The intravascular blood pump mainly comprises an impeller and a motor for driving the impeller to rotate, and when the impeller rotates, blood is conveyed from a blood inflow port of the blood pump to a blood outflow port. Specifically, the motor generates a rotating magnetic field when operating, and the impeller is provided with a magnet interacting with the rotating magnetic field to rotate the impeller around the axis thereof. However, the magnets on the impeller can increase the weight of the impeller, reducing the pumping efficiency of the impeller; furthermore, the size and shape of the impeller is limited by the magnets thereon, which increases the difficulty of machining the impeller.

SUMMERY OF THE UTILITY MODEL

To address at least one of the above-mentioned deficiencies, the present invention is directed to a blood pump with high pumping efficiency.

The utility model provides a blood pump, which comprises a sleeve, an impeller arranged in the sleeve and a driving unit for rotating the impeller, wherein the sleeve is provided with a blood flow inlet and a blood flow outlet; the drive unit comprises a shell, and a rotor and a stator which are arranged in the shell, the proximal end of the sleeve is connected to the shell, the rotor comprises a rotating shaft, and the rotating shaft extends out of the shell and is connected with the impeller; characterized in that the rotor further comprises at least two magnets arranged on the rotating shaft;

the stator comprises a first stator and a second stator which are arranged around the rotating shaft, the first stator and the second stator are arranged at intervals along the axial direction, a rotating magnetic field generated by the first stator interacts with one of the two magnets to enable the rotating shaft to rotate, and a rotating magnetic field generated by the second stator interacts with the other of the two magnets to enable the rotating shaft to rotate.

In the blood pump of the present invention, the rotor further includes at least one flywheel, two magnets fixed to the flywheel, respectively.

In the blood pump of the present invention, the flywheel is a disc-shaped structure, two the magnets are respectively a first magnet and a second magnet, the first magnet is fixed to the flywheel towards one side of the first stator, and the second magnet is fixed to the flywheel towards one side of the second stator.

In the blood pump of the present invention, the housing is close to the position of the flywheel, and a positioning structure is provided in the position of the flywheel, and the connecting wire of the stator is fixed in the positioning structure.

In the blood pump of the present invention, the stator includes a plurality of columns arranged around the axis of the rotating shaft, and a coil winding around the periphery of each of the columns; the axial distance between the magnet and the column is 0.1-2 mm.

In the blood pump of the present invention, the column comprises a rod portion and a head portion, and the head portion is fixed to one end of the rod portion;

the stator further comprises a back plate, the back plate is connected with one end, far away from the head, of the rod part, and a first mounting hole for the rotating shaft to penetrate is formed in the back plate.

In the blood pump of the present invention, the rotating shaft is provided with a first magnet, a second magnet, a third magnet and a fourth magnet, the first stator is located between the first magnet and the second magnet, and the second stator is located between the third magnet and the fourth magnet;

the post comprises a rod part, a first head part and a second head part, wherein the first head part and the second head part are respectively arranged at two ends of the rod part.

In the blood pump of the present invention, the shaft is provided with a first flywheel, a second flywheel and a third flywheel, the first magnet is fixed on the first flywheel, the second magnet and the third magnet are respectively fixed on the second flywheel, and the fourth magnet is fixed on the third flywheel.

In the blood pump of the present invention, the housing includes a first housing covering the distal end of the rotor, a second housing covering the proximal end of the rotor, two third housings respectively covering the first stator and the second stator, and a fourth housing covering the flywheel;

the first shell is connected with one third shell, the second shell is connected with the other third shell, and the two third shells are respectively connected to the fourth shell; the first shell is internally provided with a through hole, and the rotating shaft extends to the outside of the first shell and is fixedly connected with the impeller through the through hole.

In the blood pump of the present invention, the driving unit further includes a distal bearing and a proximal bearing respectively connected to the rotating shaft, and a control member electrically connected to the stator;

the distal bearing is fixed within the first housing and the proximal bearing is fixed within the second housing; the control piece is fixed in the first shell and/or the second shell, a second mounting hole is formed in the control piece, and the rotating shaft penetrates through the second mounting hole.

In conclusion, implement the utility model discloses a blood pump has following beneficial effect: because this application has two independent first stators and second stator, first stator and second stator interact in order to drive the pivot rotation with the magnet that corresponds respectively, and the load torque and the power of improvement pivot that can be very big to improve the pumping efficiency of impeller.

Furthermore, compared with the method that the magnets are directly arranged on the impeller, the method that the magnets are arranged on the rotating shaft enables the axial distance between each stator and the corresponding magnet not to be interfered by other parts, particularly the axial distance between the impeller and the shell and the thickness of the shell are affected, and the stator and the corresponding magnet are easy to obtain smaller axial distance. When the axial distance between the stator and the corresponding magnet is reduced, the magnetic density between the stator and the corresponding magnet is increased, and the output power of the driving unit is increased accordingly. And, because the magnet setting is in the pivot for the size and the shape design of this application impeller do not receive the influence of magnet, and the design of impeller is more nimble, has reduced the processing degree of difficulty of impeller. In addition, the first stator and the second stator are arranged at intervals along the axial direction, and the radial size of the driving unit is not increased. That is, the present application can greatly increase the output power and the load torque of the drive unit without increasing the overall radial dimension of the drive unit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a perspective view of a blood pump according to a first embodiment of the present invention;

FIG. 2 is an exploded view of the blood pump of FIG. 1;

FIG. 3 is a cross-sectional view of the impeller and drive unit connection of the blood pump of FIG. 1;

FIG. 4 is an exploded view of the impeller and drive unit of the blood pump of FIG. 3;

FIG. 5 is an exploded view of the rotor and stator of the drive unit shown in FIG. 3;

FIG. 6 is a schematic view of the rotor shaft and flywheel of the rotor shown in FIG. 5;

FIG. 7 is an exploded view of the stator shown in FIG. 5;

FIG. 8 is a schematic structural view of a back plate of the stator shown in FIG. 7;

FIG. 9 is an exploded view of the housing of the drive unit shown in FIG. 3;

FIG. 10 is a schematic view of a second housing of the housing of FIG. 9;

fig. 11 is a cross-sectional view of an impeller and drive unit of a blood pump according to a second embodiment of the present invention;

FIG. 12 is an exploded view of the impeller and drive unit of the blood pump of FIG. 11;

FIG. 13 is an exploded view of the stator and rotor of the drive unit of FIG. 11;

FIG. 14 is an exploded view of the stator shown in FIG. 13;

FIG. 15 is an exploded view of the housing of the drive unit shown in FIG. 11;

fig. 16 is a cross-sectional view of an impeller and drive unit of a blood pump according to a third embodiment of the present invention;

fig. 17 is an exploded view of the stator and rotor of the drive unit shown in fig. 16.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the field of interventional medicine, it is generally defined that the end of the instrument proximal to the operator is the proximal end and the end distal to the operator is the distal end.

Referring to fig. 1 and 2, a first embodiment of the present invention provides a blood pump 100, which at least includes an impeller 10, a driving unit 20, a sleeve 30 and a catheter 40. The distal end of the catheter 40 is connected to the proximal end of the drive unit 20 and the proximal end of the cannula 30 is connected to the distal end of the drive unit 20. The impeller 10 is disposed within the casing 30 in rotational connection with the drive unit 20.

The conduit 40 is used for accommodating a supply line, such as a cleaning line, a wire electrically connected to the driving unit 20, and the like. The cannula 30 is provided with a blood inlet 31 and a blood outlet 32, and when the impeller 10 is operated, blood enters the cannula 30 through the blood inlet 31 and is discharged from the blood outlet 32 along the blood flow path in the cannula 30.

Referring to fig. 3, the driving unit 20 at least includes a housing 21, and a rotor 22 and a stator 23 disposed in the housing 21.

The rotor 22 includes a rotation shaft 221, and a first magnet 223a and a second magnet 223b respectively fitted on the rotation shaft 221. The distal end of the rotating shaft 221 extends out of the casing 21 and is fixedly connected with the impeller 10, and the first magnet 223a and the second magnet 223b are located in the casing 21.

The stator 23 includes a first stator 23a and a second stator 23b arranged around the rotation shaft 221, respectively, and the first stator 23a and the second stator 23b are provided at intervals in the axial direction. Wherein the rotating magnetic field generated by the first stator 23a interacts with the first magnet 223a to rotate the rotation shaft 221, and the rotating magnetic field generated by the second stator 23b interacts with the second magnet 223b to rotate the rotation shaft 221.

Since the stator 23 includes two independent first stators 23a and second stators 23b, and the first stators 23a and the second stators 23b respectively interact with the corresponding magnets to drive the rotating shaft 221 to rotate, the torque and power of the rotating shaft 221 can be greatly improved, thereby improving the pumping efficiency of the impeller 10.

Further, compared with the arrangement of the magnets directly on the impeller, the arrangement of the magnets on the rotating shaft 221 in the present application can make the axial distance between each stator and the corresponding magnet not interfered by other components, especially the axial distance between the impeller 10 and the casing 21 and the thickness of the casing 21, so that a smaller axial distance between the stator and the corresponding magnet can be easily obtained. When the axial distance between the stator and the corresponding magnet is decreased, the magnetic density between the stator and the corresponding magnet is increased, and the output power of the driving unit 20 is increased accordingly. In addition, since the magnet is arranged on the rotating shaft 221, the size and shape design of the impeller 10 is not affected by the magnet, the design of the impeller 10 is more flexible, and the processing difficulty of the impeller 10 is reduced.

In addition, the present application provides the first stator 23a and the second stator 23b spaced apart in the axial direction, without increasing the radial dimension of the drive unit 20. That is, the present application can greatly increase the output power and the load torque of the drive unit 20 without increasing the overall radial size of the drive unit 20.

The structure of the drive unit 20 will be specifically described below.

Referring to fig. 4, the driving unit 20 includes a housing 21, and a rotor 22, a first stator 23a, a second stator 23b, a distal bearing 24, a proximal bearing 25 and a control member 26 respectively installed in the housing 21.

Referring to fig. 5, the rotor 22 includes a rotating shaft 221, a flywheel 222, a first magnet 223a and a second magnet 223 b.

Wherein, the distal end of the rotating shaft 221 extends out of the casing 21 and is fixedly connected with the impeller 10. The flywheel 222 is fixed to the rotating shaft 221 and extends in a radial direction toward a side away from the rotating shaft 221. The first stator 23a and the second stator 23b are respectively disposed on both sides of the flywheel 222. The first magnet 223a is fixed to a side of the flywheel 222 facing the first stator 23a, and the second magnet 223b is fixed to a side of the flywheel 222 facing the second stator 23 b.

Specifically, the first magnet 223a is formed by surrounding a plurality of magnetic units, and two adjacent magnetic units are arranged at intervals. If the gap between two adjacent magnetic units is too small, the innermost magnetic field extending between the two adjacent magnetic units cannot interact with the rotating magnetic field generated by the first stator 23a, and affects the rotation speed of the rotating shaft 221. Therefore, the present invention allows the adjacent two magnetic units to be spaced apart from each other, and adjusts the size of the gap between the adjacent two magnetic units according to the size of the axial distance between the first magnet 223a and the first stator 23 a. Similarly, the second magnet 223b is also formed by surrounding a plurality of magnetic units, and two adjacent magnetic units are disposed at intervals.

In the present embodiment, the first magnet 223a and the second magnet 223b are each composed of six magnetic units, which are arranged at intervals around the axis of the rotating shaft 221. Each magnetic unit is a fan-shaped magnet, so that the magnet is approximately in a circular ring structure. It is understood that in other embodiments, the first magnet 223a and the second magnet 223b may also be composed of more or less magnetic units, such as two, four, eight or ten, etc.; alternatively, in other embodiments, the number of magnetic units constituting the first magnet 223a is different from the number of magnetic units constituting the second magnet 223 b.

Referring to fig. 6, the flywheel 222 includes a main body 2221, a first mounting boss 2222a and a second mounting boss 2222 b.

The main body portion 2221 has a substantially disk-shaped structure, preferably a disk-shaped structure, and is fixed to the rotating shaft 221 to extend in a radial direction toward a side away from the rotating shaft 221, and the first magnet 223a and the second magnet 223b are respectively fixed to both sides of the main body portion 2221.

The first and second mounting bosses 2222a and 2222b are axially disposed at both sides of the main body portion 2221, the first magnet 223a is disposed around the outer circumference of the first mounting boss 2222a, and the second magnet 223b is disposed around the outer circumference of the second mounting boss 2222 b. The installation bosses are arranged on the two sides of the main body portion 2221, so that the magnet can be conveniently assembled and positioned, and the magnet can be better fixed on the main body portion 2221.

According to the present invention, the flywheel 222 is disposed on the rotating shaft 221, and the two magnets are fixed on the flywheel 222, and the rotating shaft 221 is driven to rotate by the flywheel 222, such that the connection strength between the magnets 223 and the rotating shaft 221 can be increased, and the stability of the rotation of the rotating shaft 221 can be improved.

In this embodiment, the flywheel 222 and the rotating shaft 221 are integrally formed. In other embodiments, the flywheel 222 can be fixedly connected to the rotating shaft 221 by other means, such as adhesion, welding, etc.

It should be understood that the flywheel 222 of the present embodiment is only used as an example, and is not limited to the present application, and the flywheel 222 of the present application may have other structures as long as the magnet can be fixed to the rotating shaft 221. For example, in other embodiments, the flywheel 222 only includes the main body portion 2221, and the two magnets are respectively fixed to two sides of the main body portion 2221; alternatively, the flywheel 222 is composed of a plurality of support rods spaced around the axis of the rotating shaft 221, one end of each support rod is fixed on the rotating shaft 221, and the other end extends in the radial direction toward the first side away from the rotating shaft 221, the number of the support rods is the same as that of the magnetic units constituting the magnet, and the magnetic units are fixed on the corresponding support rods.

It is also understood that in other embodiments, the flywheel 222 may not be disposed on the rotating shaft 221, and the magnet is directly fixed on the rotating shaft 221; alternatively, the rotation shaft 221 may be provided with fixing grooves, and the first magnet 223a and the second magnet 223b may be respectively fitted into the corresponding fixing grooves.

Referring to fig. 7, the first stator 23a and the second stator 23b have the same structure, and each stator includes a plurality of posts 231 arranged around the axis of the rotating shaft 221, a coil winding 232 surrounding the outer circumference of each post 231, and a back plate 233. The stator 23 has a passage extending through the center thereof in the axial direction, and the rotating shaft 221 rotatably passes through the passage.

Wherein, a plurality of posts 231 are arranged around the axis of the rotating shaft 221, and enclose into a circular ring-like structure, the rotating shaft 221 passes through the center of the circular ring-like structure, and the posts 231 and the corresponding magnets are arranged at intervals along the axial direction. The post 231 serves as a magnetic core and is made of a soft magnetic material such as cobalt steel or the like. The axial distance between the column 231 of the first stator 23a and the first magnet 223a is 0.1mm to 2mm, preferably 0.1mm to 0.5 mm; and/or the axial distance between the column 231 of the second stator 23b and the second magnet 223b is 0.1mm to 2mm, preferably 0.1mm to 0.5 mm.

It should be noted that, when the end surface of the magnet or the post 231 is a slant surface or a non-flat surface, the "axial distance" between the post 231 and the first magnet 223a (or the second magnet 223b) refers to the axial distance between the point of the first magnet 223a (or the second magnet 223b) at the most proximal end and the point of the post 231 at the most distal end; alternatively, the axial distance between the most distal point of the first magnet 223a (or the second magnet 223b) and the most proximal point of the post 231. The magnet and the column 231 are axially arranged on the rotating shaft 221 at intervals, and the axial distance between the magnet and the column 231 is set to be 0.1-2 mm, so that the magnet and the column can have larger magnetic density, and the output power of the driving unit 20 is increased.

Specifically, each post 231 includes a stem 2311 and a head 2312 secured to an end of the stem 2311, the head 2312 being magnetically coupled to a corresponding magnet.

The coil winding 232 includes a plurality of coils 2321, the number of coils 2321 is the same as the number of posts 231, and the outer circumference of each rod 2311 is surrounded by a corresponding coil 2321. The coil windings 232 are sequentially controlled by a control unit (not shown) to create a rotating magnetic field for driving the magnets.

The back plate 233 is connected to the end of the stem 2311 remote from the head 2312 to close the magnetic flux loop, increase the magnetic flux, improve the coupling capability, and facilitate the blood pump to increase the output power of the drive unit 20 while reducing the overall radial dimension. The back plate 233 is also made of a soft magnetic material, such as cobalt steel, as the material of the post 231.

As shown in fig. 8, a first mounting hole 2331 is formed in the back plate 233, the first mounting hole 2331 is in clearance fit with the shaft 221, and the shaft 221 rotatably passes through the first mounting hole 2331. The back plate 233 is further provided with a clearance groove 2332 for passing a connection line of the coil winding 232. The back plate 233 is further provided with a through hole 2333 extending axially therethrough, and during assembly, glue can be poured between the back plate 233 and the rod 2311 through the through hole 2333, so that the rod 2311 and the back plate 233 are fixedly connected. In the embodiment shown in fig. 8, the through holes 2333 are counter bored, the number of the through holes 2333 is the same as the number of the rods 2311, and each through hole 2333 corresponds to the position of the rod 2311. It is understood that in other embodiments, the through hole 2333 may have other hole structures as long as it can penetrate through the back plate 233; alternatively, the rod 2311 and the back plate 233 are fixedly connected by other connection means such as welding without providing the through hole 2333 in the back plate 233.

Referring to fig. 9, the housing 21 includes a first housing 211, a second housing 212, two third housings 213, and a fourth housing 214.

The first housing 211 is disposed outside the distal end of the rotor 22, the second housing 212 is disposed outside the proximal end of the rotor 22, the two third housings 213 are disposed outside the two stators, and the fourth housing 214 is located between the two third housings 213 and disposed outside the flywheel 222.

Specifically, the first housing 211 is substantially an open-ended structure with the other end closed, and is disposed around the distal end of the rotor 22.

Along the direction from the proximal end to the distal end of the first housing 211, a first connection groove 2110, a first installation groove 2111, a first limit groove 2112, a second limit groove 2113 and a through hole 2114 are disposed in the first housing 211.

The first coupling groove 2110 is for coupling with the third housing 213. In assembling, the distal end connector 2131 of the third housing 213 is inserted into the first connecting groove 2110 to fixedly connect the first housing 211 and the third housing 213.

The first mounting groove 2111 is used for receiving the back plate 233 of the first stator 23a, and the back plate 233 is fixed in the first mounting groove 2111. A side wall of the first mounting groove 2111 is provided with a first seating groove 2116, and the first seating groove 2116 is depressed from the side wall of the first mounting groove 2111 toward the outer surface of the first housing 211. As shown in fig. 8, a limiting protrusion 2334 is provided on a sidewall of the back plate 233. During assembly, the limiting protrusion 2334 of the back plate 233 is abutted against the first positioning groove 2116, so that the back plate 233 is prevented from rotating in the first mounting groove 2111.

The first retaining groove 2112 is used for accommodating the control member 26, and the control member 26 is fixed in the first retaining groove 2112. In this embodiment, the control member 26 includes three PCB boards, one of which is fixed in the first retaining groove 2112, and the other two of which are fixed in the second housing 212. The connection lines of the coil windings 232 are connected to the corresponding PCB boards, respectively. Each PCB is provided with a second mounting hole, the second mounting hole is in clearance fit with the rotating shaft 221, and the rotating shaft 221 can rotatably penetrate through the mounting hole. It is understood that the present embodiment is not limited to the specific number of PCB boards, and one, two or more PCB boards may be provided as required.

The second retaining groove 2113 is configured to receive the distal bearing 24, and the distal bearing 24 is fixed in the second retaining groove 2113. Wherein the distal bearing 24 abuts against the side wall of the second retaining groove 2113, preventing the distal bearing 24 from moving in the radial direction. As shown in fig. 6, the rotating shaft 221 is provided with a distal end limiting portion 2211, the distal end limiting portion 2211 is engaged with the bottom wall of the second limiting groove 2113, so as to limit the distal end bearing 24 between the distal end limiting portion 2211 and the second limiting groove 2113, and prevent the distal end bearing 24 from moving in the axial direction.

The through hole 2114 is for the distal end of the shaft 221 to pass through. The through hole 2114 is in clearance fit with the rotating shaft 221, and the distal end of the rotating shaft 221 extends out of the casing 21 through the through hole 2114 and is fixedly connected with the impeller 10.

Referring to fig. 9 and 10, the second housing 212 is generally an open-ended structure with the other end closed, and is disposed over the proximal end of the rotor 22.

In the direction from the distal end to the proximal end of the second housing 212, a second connecting groove 2120, a second mounting groove 2121, a third limiting groove 2122, a fourth limiting groove 2123 and a connecting hole 2124 are disposed in the second housing 212.

Wherein the second connecting slot 2120 is used for connecting with the third housing 213. When assembling, the proximal connector 2132 of the third housing 213 is inserted into the second connecting groove 2110, so that the second housing 212 and the third housing 213 are fixedly connected.

The second mounting groove 2121 is configured to receive the back plate 233 of the second stator 23b, and the back plate 233 is fixed in the second mounting groove 2121. The side wall of the second mounting groove 2121 is provided with a second positioning groove 2126, and the second positioning groove 2126 is recessed from the side wall of the second mounting groove 2121 toward the outer surface of the second housing 212. As shown in fig. 8, a limiting protrusion 2334 is provided on a sidewall of the back plate 233. During assembly, the limiting protrusion 2334 of the back plate 233 is abutted against the second positioning groove 2126 to prevent the back plate 233 from rotating in the first mounting groove 2111.

The third limiting groove 2122 is used for accommodating the control element 26, and the control element 26 is fixed in the third limiting groove 2122. In this embodiment, the control component 26 includes three PCB boards, one of the three PCB boards is fixed in the first retaining groove 2112 of the first housing 211, and the other two PCB boards are axially stacked and fixed in the third retaining groove 2122 of the second housing 212.

The fourth limiting groove 2123 is used for accommodating the proximal bearing 25, and the proximal bearing 25 is fixed in the fourth limiting groove 2123. The proximal bearing 25 abuts against the side wall of the fourth retaining groove 2123 to prevent the proximal bearing 25 from moving in the radial direction. As shown in fig. 6, the rotating shaft 221 is provided with a proximal end limiting portion 2212, the proximal end limiting portion 2212 is engaged with the bottom wall of the fourth limiting groove 2123, so as to limit the proximal bearing 25 between the proximal end limiting portion 2212 and the fourth limiting groove 2123, and prevent the proximal bearing 25 from moving axially.

The connection hole 2124 is used for passing supply lines (e.g., a cleaning line, and a wire electrically connected to the PCB board) in the guide duct 40. In the embodiment shown in fig. 10, the connection holes 2124 include three, and each connection hole 2124 axially penetrates the second housing 212.

Referring to fig. 9 again, the third housing 213 is substantially a cylindrical structure with two open ends, and the two third housings 231 are respectively sleeved outside the first stator 23a or the second stator 23 b.

A distal connector 2131 and a proximal connector 2132 are respectively disposed at two ends of the third housing 213. In assembly, the distal connector 2131 of one third housing 213 is inserted into the first connector groove 2110 of the first housing 211, and the proximal connector 2132 of the other third housing 213 is inserted into the second connector groove 2120 of the second housing 212.

The fourth housing 214 is a substantially cylindrical structure with two open ends, and is disposed outside the flywheel 222. The two ends of the fourth housing 214 are respectively provided with a connecting member (not numbered) engaged with the third housing 213, so that the fourth housing 214 is fixedly connected with the third housings 213 located at the two sides thereof.

The inner wall of the fourth housing 214 is provided with a positioning structure 2141, and the connecting wires of the coil winding 232 are fixed in the positioning structure 2141. By fixing the connecting wires of the coil windings 232 on the positioning structure 2141, the connecting wires of the coil windings 232 can be kept away from the flywheel 222, and the connecting wires are prevented from moving randomly, so that the connecting wires are prevented from being damaged when the flywheel 222 rotates at a high speed.

In the embodiment shown in fig. 9, the positioning structure 2141 is an axially extending slot structure in which the connecting wires of the coil windings 232 are held to prevent the connecting wires from being randomly displaced. It is understood that the present embodiment does not limit the specific structure of the positioning structure 2141, as long as it can prevent the connecting wires of the coil winding 232 from being damaged by the flywheel 222. For example, in other embodiments, the positioning structure 2141 is two hole structures spaced apart from each other, and the connection wires of the coil winding 232 extend through one of the hole structures to the outside of the fourth housing 214, and then extend through the other hole structure to the inside of the fourth housing 214 after passing over the flywheel 222.

It should be understood that the housing 21 of the present embodiment is only used as an example, and is not limited to the present application, and the housing 21 of the present application may also have other structures as long as it can be sleeved outside the stator 23 and the rotor 22 to play a role in sealing the stator 23 and the rotor 22. For example, in other embodiments, the housing 21 includes a first housing 211 that fits over the distal end of the rotor 22, a second housing 212 that fits over the proximal end of the rotor 22, and a fifth housing that fits over both the stator and the flywheel.

Referring to fig. 11, a second embodiment of the present invention provides a blood pump 100, which at least includes an impeller 10, a driving unit, a sleeve and a catheter. The driving unit includes at least a housing 21, and a rotor 22 and a stator 23 disposed in the housing 21. The rotor 22 includes a rotating shaft 221, and the rotating shaft 221 extends out of the casing 21 and is connected to the impeller 10.

The second embodiment is different from the first embodiment in that the rotor 22 includes a first magnet 223a, a second magnet 223b, a third magnet 223c, and a fourth magnet 223d that are provided at intervals in the axial direction of the rotation shaft 221. The first stator 23a is positioned between the first magnet 223a and the second magnet 223b, and the rotating magnetic field generated by the first stator 23a interacts with the first magnet 223a and the second magnet 223b, respectively, to rotate the rotating shaft 221. The second stator 23b is positioned between the third magnet 223c and the fourth magnet 223d, and the rotating magnetic field generated by the second stator 23b interacts with the third magnet 223c and the fourth magnet 223d, respectively, to rotate the rotating shaft 221.

Compared to the first embodiment, the second embodiment uses two stators to drive four magnets to rotate the rotating shaft 221, which can greatly improve the load torque and power of the rotating shaft 221, thereby improving the pumping efficiency of the impeller 10. Moreover, the two stators are axially spaced, and the rotating shaft 221 is driven to rotate by adopting an axial magnetic flux direct driving mode, so that the output power and the load torque of the driving unit 20 can be increased on the basis of not increasing the overall radial size of the driving unit 20.

The structure of the drive unit 20 will be specifically described below.

Referring to fig. 12, the driving unit 20 includes a housing 21, and a rotor 22, a first stator 23a, a second stator 23b, a distal bearing 24, a proximal bearing 25 and a control member 26 respectively installed in the housing 21.

Referring to fig. 13, the rotor 22 includes a rotating shaft 221, a first flywheel 222a, a second flywheel 222b, a third flywheel 222c, a first magnet 223a, a second magnet 223b, a third magnet 223c, and a fourth magnet 223 d.

Wherein, the distal end of the rotating shaft 221 extends out of the casing 21 and is fixedly connected with the impeller 10. Three flywheels are axially spaced on the shaft 221. The first magnet 223a is fixed to the first flywheel 222a, the second magnet 223b and the third magnet 223c are respectively disposed at both sides of the second flywheel 222b, and the fourth magnet 223d is fixed to the third flywheel 222 c.

Referring to fig. 14, the first stator 23a and the second stator 23b have the same structure, and each stator includes a plurality of posts 231 arranged around the axis of the rotating shaft 221, and a coil winding 232 wound around the outer circumference of each post 231. The post 231 includes a stem 2311, and a first head 2312a and a second head 2312b disposed at opposite ends of the stem 2311.

The axial distance between the post 231 of the first stator 23a and the first magnet 223a or/and the second magnet 223b is 0.1mm to 2mm, preferably 0.1mm to 0.5 mm. The axial distance between the post 231 of the second stator 23b and the third magnet 223c or/and the fourth magnet 223d is 0.1mm to 2mm, preferably 0.1mm to 0.5 mm.

The coil winding 232 includes a plurality of coils 2321, the number of coils 2321 is the same as the number of posts 231, and the outer circumference of each rod 2311 is surrounded by a corresponding coil 2321. The coil windings 232 are sequentially controlled by a control unit (not shown) to create a rotating magnetic field for driving the magnets 223.

Referring to fig. 15, the housing 21 includes a first housing 211, a second housing 212, two third housings 213, and a fourth housing 214.

The first housing 211 is disposed outside the distal end of the rotor 22, the second housing 212 is disposed outside the proximal end of the rotor 22, the two third housings 213 are disposed outside the two stators, and the fourth housing 214 is located between the two third housings 213 and disposed outside the second flywheel 222 b. Since the structures of the third housing 213 and the fourth housing 214 of the second embodiment are the same as those of the first embodiment, the detailed structures of the third housing 213 and the fourth housing 214 are not repeated herein.

The first housing 211 is substantially open at one end and closed at the other end. Along the direction from the proximal end to the distal end of the first housing 211, a first connection groove 2110, a first installation groove 2111, a first limit groove 2112, a second limit groove 2113 and a through hole 2114 are disposed in the first housing 211.

The first mounting groove 2111 is used for accommodating the first magnet 223a and the first flywheel 222a, and the first magnet 223a and the first flywheel 222a are rotatably accommodated in the first mounting groove 2111. The inner diameter of the first mounting groove 2111 is larger than the outer diameters of the first magnet 223a and the first flywheel 222a, so that the first magnet 223a and the first flywheel 222a are prevented from touching the inner wall of the first mounting groove 2111 during rotation.

The first coupling groove 2110 is used to couple with the third housing 213, as in the first embodiment. The first retaining groove 2112 is used for accommodating the control member 26, and the control member 26 is fixed in the first retaining groove 2112. The second retaining groove 2113 is configured to receive the distal bearing 24, and the distal bearing 24 is secured within the first retaining groove 2112. The through hole 2114 is used for the distal end of the rotating shaft 211 to pass through, and the distal end of the rotating shaft 221 extends out of the casing 21 through the through hole 2113 to be fixedly connected with the impeller 10.

The second housing 212 is generally open at one end and closed at the other end, and is disposed over the proximal end of the rotor 22. In the direction from the distal end to the proximal end of the second housing 212, a second connecting groove 2120, a second mounting groove 2121, a third limiting groove 2122, a fourth limiting groove 2123 and a connecting hole 2124 are disposed in the second housing 212.

The second mounting groove 2121 is used for accommodating the fourth magnet 223d and the third flywheel 222c, and the fourth magnet 223d and the third flywheel 222c are rotatably accommodated in the second mounting groove 2121. The inner diameter of the second mounting groove 2121 is larger than the outer diameters of the fourth magnet 223d and the third flywheel 222c, so that the fourth magnet 223d and the third flywheel 222c are prevented from touching the inner wall of the second mounting groove 2121 during rotation.

The second coupling groove 2120 is for coupling with the third housing 213, as in the first embodiment. The third limiting groove 2122 is used for accommodating the control member 26, and the control member 26 is fixed in the third limiting groove 2122. The fourth limiting groove 2123 is used for accommodating the proximal bearing 25, and the proximal bearing 25 is fixed in the fourth limiting groove 2123. The connection hole 2124 is used for passing supply lines (e.g., a cleaning line, and a wire electrically connected to the PCB board) in the guide duct 40.

Referring to fig. 16 and 17, a third embodiment of the present invention provides a blood pump 100, which includes at least an impeller 10, a drive unit, a cannula, and a catheter. The driving unit includes at least a housing 21, and a rotor 22 and a stator 23 disposed in the housing 21. The rotor 22 includes a rotating shaft 221, and the rotating shaft 221 extends out of the casing 21 and is connected to the impeller 10.

The third embodiment is different from the second embodiment in that the rotor 22 includes two flywheels, namely a first flywheel 222a and a second flywheel 222b, axially spaced from each other and disposed on the rotating shaft 221. The first flywheel 222a is provided with a first magnet 223a, and the second flywheel 222b is provided with a second magnet 223b and a third magnet 223c, respectively.

The stator 23 includes two stators, namely a first stator 23a and a second stator 23b, and the first stator 23a and the second stator 23b are axially spaced at two sides of the second flywheel 222 b. The first stator 23a is located between the first magnet 223a and the second magnet 223b, and the rotating magnetic field generated by the first stator 23a acts on the first magnet 223a and the second magnet 223b respectively to rotate the rotating shaft 221; the second stator 23b faces the third magnet 223c, and the rotating magnetic field generated by the second stator 23b acts on the third magnet 223c to rotate the rotating shaft 221.

Referring to fig. 17, the first stator 23a includes a plurality of first posts 231a arranged around the axis of the rotating shaft 221, and a coil winding 232 wound around the outer circumference of each first post 231 a. The first post 231a includes a rod portion, and a first head portion and a second head portion respectively disposed at both ends of the rod portion.

The second stator 23b includes a plurality of second columns 231b arranged around the axis of the rotation shaft 221, a coil winding 232 wound around the outer circumference of each second column 231b, and a back plate 233. The second post 231b includes a rod portion and a head portion at one end of the rod portion, and the back plate 233 is connected to one end of the rod portion 2311 remote from the head portion.

The axial distance between the first column 231a and the first magnet 223a or/and the second magnet 223b is 0.1mm to 2mm, preferably 0.1mm to 0.5 mm. The axial distance between the second column 231b and the third magnet 223c is 0.1mm to 2mm, preferably 0.1mm to 0.5 mm.

Compared with the first embodiment, the third embodiment uses two stators 23 to drive two flywheels 222 to rotate, and can greatly improve the load torque and power of the rotating shaft 221. Moreover, the two stators 23 are arranged at intervals along the axial direction, and the flywheel 222 is driven to rotate by adopting a mode of directly driving through axial magnetic flux, so that the output power and the load torque of the driving unit 20 can be increased on the basis of not increasing the overall radial size of the driving unit 20.

Since the structure of the first stator 23a of the third embodiment is the same as that of the second embodiment, and the structure of the second stator 23b is the same as that of the first embodiment, the specific structures of the first stator 23a and the second stator 23b and the specific structure of the corresponding housing are not repeated herein.

It is understood that the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A blood pump comprising a cannula having a blood flow inlet and a blood flow outlet, an impeller disposed within the cannula, and a drive unit to rotate the impeller; the drive unit comprises a shell, and a rotor and a stator which are arranged in the shell, the proximal end of the sleeve is connected to the shell, the rotor comprises a rotating shaft, and the rotating shaft extends out of the shell and is connected with the impeller; characterized in that the rotor further comprises at least two magnets arranged on the rotating shaft;

2. The blood pump of claim 1, wherein said rotor further comprises at least one flywheel disposed on said shaft, and wherein said two magnets are each secured to said flywheel.

3. The blood pump of claim 2, wherein said flywheel is a disk-shaped structure, and said two magnets are a first magnet and a second magnet, respectively, said first magnet being fixed to a side of said flywheel facing said first stator, and said second magnet being fixed to a side of said flywheel facing said second stator.

4. The blood pump of claim 2, wherein a positioning structure is provided at a position of the housing close to the flywheel, and a connection line of the stator is fixed in the positioning structure.

5. The blood pump of claim 1, wherein said stator comprises a plurality of posts disposed about the axis of said shaft, and a coil winding disposed about the periphery of each said post; the axial distance between the magnet and the column is 0.1-2 mm.

6. The blood pump of claim 5, wherein said post comprises a shaft and a head, said head being secured to one end of said shaft;

7. The blood pump of claim 5, wherein said shaft has disposed thereon a first magnet, a second magnet, a third magnet, and a fourth magnet, said first stator being positioned between said first magnet and said second magnet, said second stator being positioned between said third magnet and said fourth magnet;

8. The blood pump of claim 7, wherein the shaft is provided with a first flywheel, a second flywheel and a third flywheel, the first magnet is fixed on the first flywheel, the second magnet and the third magnet are respectively fixed on the second flywheel, and the fourth magnet is fixed on the third flywheel.

9. The blood pump of claim 2, wherein said housing comprises a first housing disposed over a distal end of said rotor, a second housing disposed over a proximal end of said rotor, two third housings disposed over said first and second stators, respectively, and a fourth housing disposed over said flywheel;

10. The blood pump of claim 9, wherein said drive unit further comprises a distal bearing and a proximal bearing respectively connected to said shaft, and a control electrically connected to said stator;