CN217430665U - Drive device and blood pump - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, the utility model provides a drive arrangement and blood pump, this drive arrangement is including the drive shell, the rotor, first drive unit, second drive unit and magnetic conduction spare, the rotor includes the pivot, first magnet and second magnet, the equal rigid coupling of first magnet and second magnet in the pivot, first drive unit includes first magnetic core and first coil, second drive unit includes second magnetic core and second coil, first coil of first drive unit and second drive unit's second coil can produce the rotatory rotating magnetic field of first magnet of drive and second magnet respectively, thereby it is rotatory with the drive pivot, the magnetic conduction spare is located between first drive unit and the second drive unit, first magnetic core and second magnetic core all with magnetic conduction spare rigid coupling. The assembly difficulty of the driving device is low.

Description

Drive device and blood pump

Technical Field

The utility model belongs to the technical field of the medical instrument technique and specifically relates to a drive arrangement and blood pump are related to.

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 driving part 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 of the blood pump. The drive portion generates a rotating magnetic field that interacts with magnets on the impeller to rotate the impeller about its axis. However, since the intravascular blood pump is inserted through a blood vessel of a patient, the intravascular blood pump and the driving part thereof are generally small in volume, particularly having a diameter of at most 10 mm, and the driving part is difficult to assemble.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a blood pump and drive arrangement that the assembly degree of difficulty is lower.

In order to achieve the above object, the utility model adopts the following technical scheme: a drive device, comprising:

a drive case;

the rotor comprises a rotating shaft, a first magnet and a second magnet, the rotating shaft is rotatably mounted on the driving shell, the first magnet and the second magnet are fixedly connected to the rotating shaft, and the first magnet and the second magnet are arranged at intervals along the extending direction of the rotating shaft;

the first driving unit and the second driving unit are arranged at intervals along the extending direction of the rotating shaft, the first driving unit and the second driving unit are positioned between the first magnet and the second magnet, the first driving unit comprises a plurality of first magnetic cores arranged around the rotating shaft and first coils wound on the first magnetic cores, and the first coils can generate a rotating magnetic field for driving the first magnet to rotate; the second driving unit comprises a plurality of second magnetic cores arranged around the rotating shaft and a second coil wound on the plurality of second magnetic cores, and the second coil can generate a rotating magnetic field for driving the second magnet to rotate;

the magnetic conduction piece is fixedly contained in the driving shell, the magnetic conduction piece is located between the first driving unit and the second driving unit, wherein the first magnetic core and the second magnetic core are multiple, the second magnetic core is fixedly connected with the magnetic conduction piece, and the rotating shaft can be rotatably penetrated and arranged on the magnetic conduction piece.

In one embodiment, a clamping groove is formed in the inner wall of the driving shell, and the clamping groove can be clamped with the magnetic conduction piece.

In one embodiment, the magnetic conducting member includes a first magnetic conducting plate portion and a second magnetic conducting plate portion stacked with the first magnetic conducting plate portion, the first magnetic conducting plate portion is fixedly connected to the plurality of first magnetic cores, the second magnetic conducting plate portion is fixedly connected to the plurality of second magnetic cores, and the rotating shaft is rotatably disposed through the first magnetic conducting plate portion and the second magnetic conducting plate portion.

In one embodiment, the first magnetic conductive plate part and the second magnetic conductive plate part are fixedly connected.

In one embodiment, a clamping groove is formed in the inner wall of the driving shell, and the edges of the first magnetic conducting plate portion and the second magnetic conducting plate portion are clamped in the clamping groove.

In one embodiment, the driving device further includes a first flywheel and a second flywheel fixedly connected to the rotating shaft, the first magnet is fixedly connected to the first flywheel, and the second magnet is fixedly connected to the second flywheel.

In one embodiment, the first flywheel and the second flywheel each comprise:

an annular body;

the tubular part is fixedly connected to the inner periphery of the annular body and fixedly sleeved on the rotating shaft;

the annular wall is fixedly connected to the outer periphery of the annular body, and the annular wall, the tubular part and the annular body jointly enclose an annular groove;

wherein the first magnet is mounted in the annular groove of the first flywheel and the second magnet is mounted in the annular groove of the second flywheel.

In one embodiment, an end face of the first magnet, which is far away from the annular body of the first flywheel, is higher than an end face of the annular wall of the first flywheel, which is far away from the annular body.

In one embodiment, an end face of the second magnet, which is far away from the annular body of the second flywheel, is higher than an end face of the annular wall of the second flywheel, which is far away from the annular body.

In one embodiment, the first magnetic core and the second magnetic core are both columnar structures.

In one embodiment, the driving device further includes a bearing fixedly accommodated in the driving housing, and the rotating shaft is fixedly disposed through the bearing.

In one embodiment, one end of the rotating shaft close to the first magnet extends out of the driving shell, and the bearing is positioned at the other end of the rotating shaft; the driving device further comprises a fixed seat fixedly installed on the driving shell, and a mounting groove for accommodating the bearing is formed in the fixed seat.

In one embodiment, the inner wall of the driving shell is further provided with a positioning groove, the fixing seat is provided with a positioning protrusion, and the positioning protrusion is accommodated in the positioning groove.

In one embodiment, the driving housing has a communication port, the driving device further includes a shaft sleeve fixedly installed on the driving housing, the shaft sleeve is installed at the communication port, and the rotating shaft can rotatably penetrate through the shaft sleeve.

In one embodiment, the bushing is a ceramic bushing.

In one embodiment, the clearance between the rotating shaft and the shaft sleeve is less than or equal to 2 microns.

In one embodiment, the driving device further comprises a waterproof sealing film coated on the first driving unit, the second driving unit and the magnetic conductive member.

The utility model also provides a blood pump, include:

an impeller; and

in the driving device of any one of the above claims, a portion of the rotating shaft is located outside the driving housing and is fixedly connected to the impeller, so that the impeller can rotate along with the rotating shaft.

The utility model provides a drive arrangement's beneficial effect is: first drive unit and second drive unit arrange between first magnet and second magnet, magnetic conduction spare is located between first drive unit and the second drive unit, a plurality of first magnetic cores and a plurality of second magnetic cores all with magnetic conduction spare rigid coupling, so, can directly fix through magnetic conduction spare in order to realize first drive unit and second drive unit location and installation in the drive shell, solved the big technical problem of the current drive part installation degree of difficulty, thereby reduced drive arrangement's the installation degree of difficulty.

Furthermore, the magnetic conduction piece is respectively and fixedly connected with the first magnetic core and the second magnetic core, and plays a role in closing a magnetic circuit, so that the generation of magnetic flux is promoted and increased, and the coupling capacity is improved. And, because the magnetic conduction piece can increase the magnetic flux, consequently, the setting of magnetic conduction piece does benefit to the whole diameter that reduces drive arrangement and blood pump.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions 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 it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a blood pump according to an embodiment of the present invention;

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

fig. 3 is a schematic structural view of the blood pump provided by the embodiment of the present invention without a part of the cannula assembly and the pigtail;

FIG. 4 is a cross-sectional view of the blood pump of FIG. 3 taken along line A-A;

FIG. 5 is a schematic structural view of a drive device of the blood pump shown in FIG. 1;

FIG. 6 is a cross-sectional view of the drive unit of FIG. 5 taken along line B-B;

FIG. 7 is an exploded view of the drive arrangement of FIG. 5;

FIG. 8 is a schematic view of a portion of a drive housing of the drive of FIG. 5;

FIG. 9 is a schematic structural view of the driving device of FIG. 5 with a part of the driving case omitted;

fig. 10 is an assembly view of the rotor, the magnetic conductive member, the first driving unit and the second driving unit in fig. 9;

FIG. 11 is an assembled schematic view of the rotor and sleeve of the drive of FIG. 9;

FIG. 12 is an exploded view of FIG. 11;

fig. 13 is a schematic structural view of a first flywheel or a second flywheel of the driving device in fig. 9;

fig. 14 is a schematic view of the connection between the first driving unit and the first magnetic conductive plate in fig. 9;

fig. 15 is a schematic structural diagram of a fixing seat of the driving device in fig. 9.

Wherein, in the figures, the respective reference numerals:

10. an impeller;

20. a drive device; 21. a drive case; 211. a card slot; 212. positioning a groove; 213. a communication port; 214. a limiting bulge; 22. a rotor; 221. a rotating shaft; 222. a first magnet; 223. a second magnet; 23. a first drive unit; 231. a first magnetic core; 232. a first coil; 24. a second driving unit; 241. a second magnetic core; 242. a second coil; 25. a magnetic conductive member; 251. a first magnetic conductive plate portion; 252. a second magnetic conductive plate portion; 261. a first flywheel; 262. a second flywheel; 263. an annular body; 2631. an inner peripheral edge; 2632. an outer peripheral edge; 264. a tubular portion; 265. an annular wall; 266. an annular groove; 271. a bearing; 272. a shaft sleeve; 2721. a glue groove; 28. a fixed seat; 281. mounting grooves; 282. positioning the projection; 283. a through hole; 284. an end cap;

30. a bushing assembly; 301. an inflow port; 302. an outflow port; 31. inserting a tube; 32. an inlet tube; 33. an outlet pipe;

40. a catheter assembly; 50. pigtail tube.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, 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 indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

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.

As shown in fig. 1 to 4, a blood pump according to an embodiment, in particular to an intravascular blood pump. The blood pump comprises an impeller 10, a drive device 20 and a cannula assembly 30. Wherein, drive arrangement 20 is connected with impeller 10 transmission, and drive arrangement 20 can drive impeller 10 rotatory. The casing assembly 30 is fixed to the driving device 20, and the impeller 10 is rotatably accommodated in the casing assembly 30.

The sleeve assembly 30 has an inlet port 301 and an outlet port 302, and when the impeller 10 is rotated, blood can flow into the sleeve assembly 30 from the inlet port 301 and flow out from the outlet port 302. Specifically, the inflow port 301 is located at the distal end of the cannula assembly 30 and the outflow port 302 is located at the proximal end of the cannula assembly 30. The proximal end of the cannula assembly 30 is fixedly attached to the distal end of the drive device 20. In particular use, the cannula assembly 30 extends through a heart valve, such as an aortic valve, with the inflow port 301 located within the heart and the outflow port 302 and the drive device 20 located in a vessel, such as the aorta, outside the heart.

Specifically, the cannula assembly 30 includes a cannula 31, an inlet tube 32 and an outlet tube 33, the inlet tube 32 and the outlet tube 33 being engaged with the distal and proximal ends of the cannula 31, respectively. The inflow port 301 is located on the inlet pipe 32, and the outflow port 302 is located on the outlet pipe 33. The end of the outlet tube 33 remote from the cannula 31 is fixedly connected to the driving device 20.

In particular, the blood pump further comprises a catheter assembly 40, the distal end of the catheter assembly 40 being connected to the proximal end of the drive means 20. Wherein the conduit assembly 40 is adapted to receive various supply lines. For example, the supply lines comprise electrical connection lines for electrical connection with the drive device 20 and a purge line for passing a purge fluid to the blood pump.

Further, the blood pump also includes a pigtail 50, the proximal end of the pigtail 50 engaging the distal end of the inlet tube 32. The distal end of the pigtail 50 is curved. The pigtail 50 may be used to stabilize the position of the blood pump in the heart, providing atraumatic support for the heart tissue. Specifically, the pigtail 50 is a hollow structure. The distal end of the inlet tube 32 is provided with a perforation (not shown) for communicating the lumen of the inlet tube 32 with the lumen of the pigtail 50 for passing a guide wire therethrough.

Referring to fig. 5 to 7, the driving device 20 includes a driving housing 21, a rotor 22, a first driving unit 23, a second driving unit 24, and a magnetic conducting member 25.

The drive case 21 is a substantially hollow cylindrical case. The sleeve assembly 30 is fixedly connected to the driving case 21. Specifically, the proximal end of cannula assembly 30 engages the distal end of drive housing 21; the distal end of catheter assembly 40 is fixedly attached to the proximal end of drive housing 21.

The rotor 22 is rotatably mounted to the drive case 21. The rotor 22 is fixedly connected with the impeller 10, and the rotor 22 can drive the impeller 10 to rotate. The rotor 22 includes a rotating shaft 221, a first magnet 222 and a second magnet 223, the rotating shaft 221 is rotatably mounted on the driving housing 21, the first magnet 222 and the second magnet 223 are both fixed to the rotating shaft 221, and the first magnet 222 and the second magnet 223 are disposed at intervals along an extending direction of the rotating shaft 221. Specifically, a portion of the rotating shaft 221 is accommodated in the driving housing 21, and a portion of the rotating shaft extends out of the driving housing 21 and is fixedly connected to the impeller 10, so that the impeller 10 can rotate along with the rotating shaft 221.

The first driving unit 23 and the second driving unit 24 are both mounted on the driving housing 21, the first driving unit 23 and the second driving unit 24 are disposed at intervals along the extending direction of the rotating shaft 221, and the first driving unit 23 and the second driving unit 24 are both located between the first magnet 222 and the second magnet 223.

The first driving unit 23 includes a plurality of first cores 231 and first coils 232, the plurality of first cores 231 being disposed around the rotation shaft 221. The first coil 232 is wound around the plurality of first magnetic cores 231. Specifically, the outer circumference of each first core 231 is wound with a first coil 232. The first coil 232 is capable of generating a rotating magnetic field that drives the first magnet 222 to rotate.

The second driving unit 24 includes a plurality of second magnetic cores 241 and a second coil 242, the plurality of second magnetic cores 241 are disposed around the rotation shaft 221, and the second coil 242 is wound around the plurality of second magnetic cores 241. The second coil 242 is capable of generating a rotating magnetic field that drives the second magnet 223 to rotate. Specifically, the first and second cores 231 and 241 each extend in a direction parallel to the extending direction of the rotation shaft 221.

The magnetic conduction member 25 is fixedly accommodated in the driving case 21, and the magnetic conduction member 25 is located between the first driving unit 23 and the second driving unit 24. The plurality of first magnetic cores 231 and the plurality of second magnetic cores 241 are all fixedly connected with the magnetic conduction member 25. The rotating shaft 221 can rotatably penetrate through the magnetic conductive member 25, the first driving unit 23, and the second driving unit 24.

The magnetic conductive member 25 plays a role of closing a magnetic circuit to promote and increase generation of magnetic flux and improve coupling capability. Also, since the magnetic conductive member 25 can increase the magnetic flux, the provision of the magnetic conductive member 25 is advantageous for reducing the overall diameter of the drive device 20.

The first driving unit 23 and the second driving unit 24 of the driving device 20 are disposed between the first magnet 222 and the second magnet 223, the magnetic conduction member 25 is disposed between the first driving unit 23 and the second driving unit 24, and the plurality of first magnetic cores 231 and the plurality of second magnetic cores 241 are all fixedly connected with the magnetic conduction member 25, so that, the positioning and mounting of the first drive unit 23 and the second drive unit 24 in the drive housing 21 can be achieved directly by the fixation of the magnetic conductive member 25, meanwhile, the magnetic conductive member 25 also performs a magnetic circuit closing function, in other words, the magnetic conductive member 25 not only performs a function of closing the magnetic circuit between the first driving unit 23 and the first magnet 222, and closing the magnetic circuit between the second driving unit 24 and the second magnet 223, and moreover, the positioning and the installation of the first driving unit 23 and the second driving unit 24 can be realized, and the assembly difficulty of the first driving unit 23 and the second driving unit 24 is reduced.

In addition, the above-described structure of the driving device 20 can reduce the number of positioning structures provided on the driving housing 21, thereby simplifying the structure of the driving housing 21 and also simplifying the assembly process of the entire driving device 20.

Referring to fig. 6 to 8, a locking groove 211 is disposed on an inner wall of the driving shell 21, the locking groove 211 can be locked with the magnetic conductive member 25, and the magnetic conductive member 25 can be quickly and stably mounted in the driving shell 21 by being locked in the locking groove 211.

In the illustrated embodiment, the magnetic conductive member 25 includes a first magnetic conductive plate portion 251 and a second magnetic conductive plate portion 252, and the first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252 are laminated. The first magnetic conductive plate 251 is fixedly connected to the plurality of first magnetic cores 231, the second magnetic conductive plate 252 is fixedly connected to the plurality of second magnetic cores 241, and the rotating shaft 221 is rotatably inserted through the first magnetic conductive plate 251 and the second magnetic conductive plate 252. The edges of the first magnetic conductive plate 251 and the second magnetic conductive plate 252 are engaged with the engaging groove 211.

Through with first magnetic core 231 rigid coupling first magnetic conduction board portion 251, second magnetic core 241 rigid coupling second magnetic conduction board portion 252, can make things convenient for first magnetic core 231 and second magnetic core 241 to assemble respectively to first magnetic conduction board portion 251 and second magnetic conduction board portion 252 on, can make first magnetic core 231 and second magnetic core 241 assemble more conveniently.

Specifically, the first magnetic conductive plate 251 and the second magnetic conductive plate 252 are fixedly connected, so that the first driving unit 23, the second driving unit 24 and the magnetic conductive member 25 form a whole, and the assembly is easier. The first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252 may be connected together by gluing or welding. In some embodiments, the first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252 are not fixed together, and at this time, the surfaces of the first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252 close to each other are abutted.

It should be noted that the magnetic conductive member 25 is not limited to the above-mentioned manner of combining the first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252, and the magnetic conductive member 25 may also be a plate-shaped structure, and the first magnetic core 231 and the second magnetic core 241 are both connected to the magnetic conductive member 25 and respectively extend from two opposite surfaces of the magnetic conductive member 25 in opposite directions, that is, the first driving unit 23 and the second driving unit 24 share one magnetic conductive member 25.

Referring to fig. 9 to 12, the driving device 20 further includes a first flywheel 261 and a second flywheel 262 fixedly connected to the rotating shaft 221, the first magnet 222 is fixedly connected to the first flywheel 261, and the second magnet 223 is fixedly connected to the second flywheel 262. The first flywheel 261 can increase the coupling strength of the first magnet 222 with the rotation shaft 221, and the second flywheel 262 can increase the coupling strength of the second magnet 223 with the rotation shaft 221, thereby improving the stability of the rotation shaft 221. Specifically, the first drive unit 23 and the second drive unit 24 are located between the first flywheel 261 and the second flywheel 262.

Specifically, the first flywheel 261 is integrally formed with the rotating shaft 221, or the first flywheel 261 is fixed to the rotating shaft 221 by means of bonding, welding, or the like. The second flywheel 262 is integrally formed with the rotating shaft 221, or the second flywheel 262 is fixed to the rotating shaft 221 by means of bonding, welding, or the like.

Referring to fig. 13, the first flywheel 261 and the second flywheel 262 each include an annular body 263, a tubular portion 264 and an annular wall 265. The tubular portion 264 is fixed to the inner periphery 2631 of the annular body 263, and the tubular portion 264 is fixedly sleeved on the rotating shaft 221. The annular wall 265 is fixedly connected to the outer periphery 2632 of the annular body 263, and the annular wall 265, the tubular portion 264 and the annular body 263 together define the annular groove 266.

The first magnet 222 is installed in the annular groove 266 of the first flywheel 261, the second magnet 223 is installed in the annular groove 266 of the second flywheel 262, so that the first magnet 222 and the second magnet 223 are stably installed, the connection strength between the first magnet 222 and the first flywheel 261 and between the second magnet 223 and the second flywheel 262 is improved, and meanwhile, the annular groove 266 is designed to facilitate the positioning and assembling of the first magnet 222 and the second magnet 223.

Specifically, an end surface of the first magnet 222, which is away from the annular body 263 of the first flywheel 261, is higher than an end surface of the annular wall 265 of the first flywheel 261, which is away from the annular body 263 of the first flywheel 261. That is, an end of the first magnet 222 away from the annular body 263 is exposed to the annular groove 266, so that the first magnet 222 is fitted into the first flywheel 261.

Likewise, an end surface of the second magnet 223, which is away from the annular body 263 of the second flywheel 262, is higher than an end surface of the annular wall 265 of the second flywheel 262, which is away from the annular body 263 of the second flywheel 262, so that the second magnet 223 is fitted into the second flywheel 262.

It is to be appreciated that the first and second flywheels 261, 262 are not limited to the above-described configuration, and in some embodiments, one or both of the first and second flywheels 261, 262 may not have the annular wall 265; in some embodiments, one or both of the first flywheel 261 and the second flywheel 262 do not have the annular wall 265 and the tubular portion 264, and the rotating shaft 221 is fixedly disposed through the annular body 263, e.g., the center of the annular body 263. The provision of the tubular portion 264 enables the flywheel to be more stably connected to the rotating shaft 221 than a flywheel having only the annular body 263.

Specifically, the first magnet 222 and the second magnet 223 are both ring-shaped. The first and second magnets 222 and 223 are arranged in a ring structure by a plurality of magnetic blocks in a halbach array. In the illustrated embodiment, the first and second magnets 222 and 223 each include eight magnetic blocks arranged around the rotational shaft 221. Each magnetic block is a fan-shaped annular magnet, so that the magnet is approximately in an annular structure.

It is understood that in other embodiments, the first magnet 222 and the second magnet 223 may also be composed of more or less magnetic blocks, such as two, four, six or ten, etc.

Referring to fig. 6, 7 and 14 again, in the illustrated embodiment, the first magnetic core 231 and the second magnetic core 241 are both of a cylindrical structure, and the first magnetic core 231 and the second magnetic core 241 do not have a head portion (i.e., a pole shoe) with a larger width. That is, the width of the first and second magnetic cores 231 and 241 is constant in the length direction, and the entire first and second magnetic cores 231 and 241 are magnetically coupled to the first and second magnets 222 and 223, respectively, so that compared to the magnetic core provided with the pole shoe, the first and second magnetic cores 231 and 241 having the pillar structure can reduce the magnetic loss and increase the magnetic coupling density between the magnetic core and the magnet to increase the torque of the stator to the first and second magnets 222 and 223 (under the equal current condition). In addition, the first and second cores 231 and 241 without the head portions can greatly reduce the problems of local magnetic short circuit and motor power reduction caused by the contact between the adjacent cores.

The first and second magnetic cores 231 and 241 have a substantially triangular prism shape, and one edge of each of the first and second magnetic cores 231 and 241 faces the axis of the rotation shaft 221.

Specifically, the edges of the first magnetic core 231 and the second magnetic core 241 are rounded to facilitate the winding of the first coil 232 and the second coil 242, and at the same time, to facilitate the protection of the insulating material coated on the first coil 232 and the second coil 242.

It should be noted that in other embodiments, the cross-sections of the first magnetic core 231 and the second magnetic core 241 may also be fan-shaped, circular, polygonal, fan-shaped, irregular, and so on.

It is understood that in other embodiments, the first magnetic core 231 and the second magnetic core 241 may further include a pillar portion and a head portion disposed at one end of the pillar portion, in which case the first coil 232 or the second coil 242 is disposed around the pillar portion, and the magnetic conductive member 25 is engaged with one end of the pillar portion away from the head portion.

Specifically, the first and second magnetic cores 231 and 241 are soft magnetic materials, such as cobalt steel, and the like.

Optionally, the magnetic conductive member 25 is made of the same material as the first and second magnetic cores 231 and 241.

Specifically, the rotating shaft 221 is a ceramic shaft or a stainless steel shaft.

Referring to fig. 6 and 7, the driving device 20 further includes a bearing 271 fixedly received in the driving housing 21, and the shaft 221 is fixedly inserted through the bearing 271, so that the shaft 221 is rotatably mounted in the driving housing 21 through the bearing 271. Specifically, one end of the rotating shaft 221 near the first magnet 222 extends to the outside of the driving shell 21 to be fixedly connected with the impeller 10, and the bearing 271 is located at the other end of the rotating shaft 221. Specifically, the distal end of the rotating shaft 221 extends to the outside of the distal end of the driving housing 21, and the proximal end of the rotating shaft 221 passes through the bearing 271.

The driving device 20 further includes a fixing base 28 fixedly installed on the driving shell 21, and a mounting groove 281 is formed on the fixing base 28 for accommodating the bearing 271. Thus, the bearing 271 is assembled on the fixing seat 28 through the mounting groove 281, so that the bearing 271 is installed on the driving shell 21 through the fixing seat 28, and the installation difficulty of the bearing 271 is reduced.

Specifically, the bearing 271 is a ball bearing, the bearing 271 is positioned in the driving housing 21 through the fixing seat 28, an outer ring of the bearing 271 is fixedly connected to the fixing seat 28, and an inner ring of the bearing 271 is fixedly sleeved on the rotating shaft 221.

It is understood that the bearing 271 may also be a ceramic bearing or a metal bearing.

Specifically, referring to fig. 6 to 8 and 15, a positioning groove 212 is further disposed on the inner wall of the driving shell 21, a positioning protrusion 282 is disposed on the fixing base 28, and the positioning protrusion 282 is accommodated in the positioning groove 212. The positioning protrusions 282 and the positioning grooves 212 are provided to facilitate the quick and accurate mounting of the fixing base 28 to the driving case 21.

Specifically, referring to fig. 4 and fig. 7, the driving device 20 further includes an end cover 284, the end cover 284 is sleeved on the driving shell 21 and the duct assembly 40, a part of the fixing base 28 is accommodated in the driving shell 21, and a part of the fixing base is accommodated in the end cover 284. End cap 284 serves to couple drive housing 21 to catheter assembly 40 and also serves to protect anchor block 28. In the illustrated embodiment, the anchor block 28 also extends partially into the catheter assembly 40.

Referring to fig. 6 and 9, the driving housing 21 is provided with a communication port 213, the driving device 20 further includes a shaft sleeve 272 fixedly mounted on the driving housing 21, the shaft sleeve 272 is disposed at the communication port 213, and the rotating shaft 221 is rotatably disposed through the shaft sleeve 272. The shaft 221 and the sleeve 272 form a bearing. The communication port 213 communicates with the cannula assembly 30.

Specifically, the shaft sleeve 272 is cylindrical, and a shaft hole for the shaft 221 to pass through is formed in the middle of the shaft sleeve 272. Specifically, the bushing 272 is a ceramic bushing or a metal bushing.

Specifically, referring to fig. 6 to 8, a limiting protrusion 214 is further disposed inside the driving shell 21, and the bushing 272 abuts against the limiting protrusion 214, so as to position the bushing 272 in the driving shell 21, so as to facilitate installation of the bushing 272.

Specifically, a glue groove 2721 is formed on the outer peripheral surface of the shaft sleeve 272, so that the shaft sleeve 272 and the driving shell 21 are fixedly connected in a glue dispensing manner.

Referring to fig. 2, the cleaning fluid introduced into the cleaning line can flow through the interior of the driving housing 21 and then flow out from the gap between the shaft sleeve 272 and the rotating shaft 221 into the sleeve assembly 30. On the one hand, the introduction of the cleaning fluid prevents the blood from penetrating from the drive housing 21 into the drive device 20, and on the other hand, the cleaning fluid acts as a lubricant between the shaft 221 and the sleeve 272.

Specifically, the gap between the shaft 221 and the bushing 272 is less than or equal to 2 microns. Thus, the smallest red blood cells (about 8 microns in diameter and about 2 microns thick) are difficult to enter and block the gap between the shaft 221 and the sleeve 272, and because of the width limitation of the gap, the cleaning fluid flows through the gap at high velocity, pushing blood out of the gap with high kinetic energy.

Referring to fig. 15, in detail, a through hole 283 is formed in the fixing base 28, the through hole 283 is communicated with the inner cavity of the driving shell 21, and the distal end of the cleaning pipeline is accommodated in the through hole 283.

Specifically, the cleaning fluid may be physiological saline, physiological saline containing heparin, glucose, or the like.

In order to avoid the cleaning fluid from being contaminated and/or the elements in the driving device 20 from being corroded, the driving device 20 further includes a waterproof sealing film coated on the first driving unit 23, the second driving unit 24 and the magnetic conductive member 25, wherein the waterproof sealing film may be made of silicone, a film formed after the glue is cured, or the like.

It is to be understood that the drive device 20 is not limited to the blood pump, and may be applied to other fields such as medical instruments and home appliances.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (15)

1. A drive device, comprising:

a drive case;

the rotor comprises a rotating shaft, a first magnet and a second magnet, the rotating shaft can be rotatably arranged on the driving shell, the first magnet and the second magnet are fixedly connected to the rotating shaft, and the first magnet and the second magnet are arranged at intervals along the extending direction of the rotating shaft;

the first driving unit and the second driving unit are arranged at intervals along the extending direction of the rotating shaft, the first driving unit and the second driving unit are positioned between the first magnet and the second magnet, the first driving unit comprises a plurality of first magnetic cores arranged around the rotating shaft and first coils wound on the first magnetic cores, and the first coils can generate a rotating magnetic field for driving the first magnet to rotate; the second driving unit comprises a plurality of second magnetic cores arranged around the rotating shaft and a second coil wound on the plurality of second magnetic cores, and the second coil can generate a rotating magnetic field for driving the second magnet to rotate;

the magnetic conduction piece is fixedly contained in the driving shell, the magnetic conduction piece is located between the first driving unit and the second driving unit, wherein the first magnetic core and the second magnetic core are multiple, the second magnetic core is fixedly connected with the magnetic conduction piece, and the rotating shaft can be rotatably penetrated and arranged on the magnetic conduction piece.

2. The driving device according to claim 1, wherein a locking groove is formed on an inner wall of the driving shell, and the locking groove can be locked with the magnetic conductive member.

3. The drive device according to claim 1, wherein the magnetic conductive member includes a first magnetic conductive plate portion and a second magnetic conductive plate portion laminated with the first magnetic conductive plate portion, the first magnetic conductive plate portion is fixedly connected to the plurality of first magnetic cores, the second magnetic conductive plate portion is fixedly connected to the plurality of second magnetic cores, and the rotating shaft is rotatably inserted through the first magnetic conductive plate portion and the second magnetic conductive plate portion.

4. The drive device according to claim 3, wherein the first and second magnetically permeable plate portions are fixedly connected;

and/or a clamping groove is formed in the inner wall of the driving shell, and the edges of the first magnetic conduction plate part and the second magnetic conduction plate part are clamped in the clamping groove.

5. The driving apparatus as claimed in claim 1, further comprising a first flywheel and a second flywheel fixedly connected to the rotating shaft, wherein the first magnet is fixedly connected to the first flywheel and the second magnet is fixedly connected to the second flywheel.

6. The drive of claim 5, wherein the first flywheel and the second flywheel each comprise:

an annular body;

the tubular part is fixedly connected to the inner periphery of the annular body and fixedly sleeved on the rotating shaft;

the annular wall is fixedly connected to the outer periphery of the annular body, and the annular wall, the tubular part and the annular body jointly enclose an annular groove;

wherein the first magnet is mounted in the annular groove of the first flywheel and the second magnet is mounted in the annular groove of the second flywheel.

7. The drive device according to claim 6, wherein an end face of the first magnet, which is away from the annular body of the first flywheel, is higher than an end face of the annular wall of the first flywheel, which is away from the annular body;

and/or one end face of the second magnet, which is far away from the annular body of the second flywheel, is higher than one end face of the annular wall of the second flywheel, which is far away from the annular body.

8. The driving device according to claim 1, wherein the first magnetic core and the second magnetic core are each a columnar structure.

9. The drive of claim 1, further comprising a bearing fixedly received in the drive housing, the shaft being fixedly disposed through the bearing.

10. The drive of claim 9, wherein one end of the shaft proximate the first magnet extends outside the drive housing, and the bearing is located at the other end of the shaft; the driving device further comprises a fixed seat fixedly installed on the driving shell, and a mounting groove for accommodating the bearing is formed in the fixed seat.

11. The driving device as claimed in claim 10, wherein a positioning groove is further formed on an inner wall of the driving shell, and a positioning protrusion is formed on the fixing base and received in the positioning groove.

12. The driving device as claimed in claim 1, wherein the driving shell has a communicating opening, the driving device further comprises a shaft sleeve fixedly mounted on the driving shell, the shaft sleeve is disposed at the communicating opening, and the rotating shaft is rotatably disposed through the shaft sleeve.

13. The drive of claim 12, wherein said bushing is a ceramic bushing;

and/or the clearance between the rotating shaft and the shaft sleeve is less than or equal to 2 microns.

14. The drive arrangement of claim 1, further comprising a waterproof sealing membrane that covers the first drive unit, the second drive unit, and the magnetically permeable member.

15. A blood pump, comprising:

an impeller; and

a drive arrangement according to any one of claims 1 to 14 wherein part of the shaft is located outside the drive housing and is secured to the impeller so that the impeller can rotate with the shaft.

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