CN219231201U - Cannula assembly and blood pump - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, and provides a sleeve assembly and a blood pump, wherein the sleeve assembly comprises a cannula and a connecting pipe sleeved with the cannula, and the inner wall of one end of the connecting pipe is connected with the outer wall of the cannula; and the outer wall of the connecting part is connected with the inner wall of one end of the connecting pipe, which is far away from the cannula. The sleeve assembly is more convenient and firm to assemble.

Description

Cannula assembly and blood pump

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a sleeve assembly and a blood pump.

Background

An intravascular blood pump, designed for percutaneous insertion into a patient's blood vessel, such as an artery or vein of the thigh or armpit, may be advanced into the patient's heart to function as a left ventricular assist device or a right ventricular assist device. Thus, an intravascular blood pump may also be referred to as an intracardiac blood pump.

The intravascular blood pump mainly comprises an impeller, a driving part for driving the impeller to rotate and a sleeve assembly, wherein the sleeve assembly consists of a cannula and an outlet pipe which are connected with each other, and when the impeller rotates, blood is conveyed from a blood inflow port of the cannula to a blood outflow port of the outlet pipe. However, the outlet end of the conventional cannula needs to be connected with the outlet pipe after being molded by a process, the process is complicated, the connection is not firm enough, and the strength of the molded part is reduced.

Disclosure of Invention

The utility model aims to provide a cannula component and a blood pump, which are stable in connection and simple in assembly operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

providing a cannula assembly comprising a cannula;

the inner wall of one end of the connecting pipe is connected with the outer wall of the cannula;

the outlet pipe is sleeved with the connecting pipe, the outlet pipe comprises a connecting part and an outlet part far away from the connecting pipe, and the outer wall of the connecting part is connected with the inner wall of one end, far away from the cannula, of the connecting pipe.

Optionally, a limiting convex ring is arranged on the inner wall of the connecting tube, the limiting convex ring is provided with a first end face and a second end face which are arranged along the axial direction of the connecting tube, the first end face is abutted to the end part of the insertion tube, and the second end face is abutted to the end part of the connecting part; the outer diameter of the connecting portion is smaller than that of the outlet portion, the end portion, away from one end of the insertion tube, of the connecting tube is abutted to the end portion, close to one end of the connecting portion, of the outlet portion, and the outer wall of the connecting tube is flush with the outer wall of the outlet portion.

Optionally, the inner diameter of the insertion tube is smaller than the inner diameter of the outlet tube, the width of the first end face in the radial direction is larger than the width of the second end face in the radial direction, so that the inner wall of the insertion tube is flush with the edge of the first end face, the inner wall of the outlet tube is flush with the edge of the second end face, and the limiting convex ring further comprises a transition face, and the transition face is connected with the edge of the first end face and the edge of the second end face.

Optionally, the transition surface has with the cylinder of linking pipe coaxial line and with the inclined plane of linking pipe axis angle, the one end of inclined plane with the one end of cylinder is connected, the one end of cylinder keep away from the inclined plane is connected in the edge of first terminal surface, the cylinder with the inner wall parallel and level of intubate, the one end of inclined plane keep away from the cylinder is connected in the edge of second terminal surface.

Optionally, the linking pipe includes interconnect's first pipe portion and second pipe portion, the inner wall of first pipe portion with the outer wall connection of intubate, the inner wall of second pipe portion with the outer wall connection of connecting portion, spacing bulge loop sets up the inner wall of second pipe portion, first pipe portion with the external diameter of second pipe portion is the same, the internal diameter of first pipe portion is greater than the internal diameter of second pipe portion.

Optionally, the axial length of the first tube portion is 50% -80% of the axial length of the second tube portion.

Optionally, a plurality of hollow grooves are formed in the connecting pipe, and the hollow grooves are formed in the connecting part of the connecting pipe and the cannula.

Optionally, the connecting tube and the outlet tube are metal tubes, the insertion tube is a flexible tube, the inner wall of one end of the connecting tube is fixedly bonded with the outer wall of the insertion tube, and one end of the connecting tube, which is far away from the insertion tube, is fixedly welded with the outer wall of the connecting portion.

The embodiment of the utility model also provides a blood pump, which comprises an impeller;

the driving device is in transmission connection with the impeller and can drive the impeller to rotate; and

the sleeve assembly as described above, wherein the outlet portion of the outlet tube is fixedly connected to the driving device, and the impeller is rotatably disposed in the outlet tube.

Optionally, the impeller comprises a blade, an end of the blade remote from the end of the drive means not exceeding an end of the connection remote from the end of the drive means.

The sleeve assembly provided by the utility model has the beneficial effects that: the cannula is in transitional connection with the outlet pipe through the connecting pipe, the inner wall of one end of the connecting pipe is connected with the outer wall of the cannula, and the outer wall of the connecting part of the outlet pipe is connected with the inner wall of the other end of the connecting pipe, so that the cannula and the outlet pipe are fixedly connected to form a coherent pipeline; the step that the cannula is directly sleeved with the outlet pipe and the cannula is required to be subjected to a molding process is omitted, and the cannula is firmly connected and is simple in assembly operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

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

FIG. 3 is a schematic view of a sleeve assembly according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic view of the structure of FIG. 3C;

FIG. 5 is a schematic view of the construction of an adapter tube according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of the adapter shown in FIG. 5;

FIG. 7 is a schematic cross-sectional view of a connecting tube according to another embodiment of the present utility model;

FIG. 8 is a schematic view of the blood pump of FIG. 1 with a portion of the cannula assembly omitted;

FIG. 9 is a cross-sectional view of the blood pump of FIG. 8 taken along line A-A;

fig. 10 is a schematic view of a driving device of the blood pump shown in fig. 1;

FIG. 11 is a cross-sectional view of the drive device of FIG. 10 taken along line B-B;

FIG. 12 is an exploded view of the drive device of FIG. 10;

FIG. 13 is a schematic diagram illustrating an assembly of the rotor, the magnetic conductive member, the first driving unit and the second driving unit shown in FIG. 11;

FIG. 14 is a schematic view of an assembly of a rotor and a sleeve of the drive device shown in FIG. 11;

FIG. 15 is an exploded view of FIG. 14;

FIG. 16 is a schematic view of the first flywheel or the second flywheel of the driving device shown in FIG. 13;

FIG. 17 is a schematic diagram illustrating the connection between the first driving unit and the first magnetic conductive plate in FIG. 13;

fig. 18 is a schematic structural view of a fixing base of the driving device shown in fig. 11.

Wherein, each reference sign in the figure:

10. an impeller; 11. a blade; 12. a hub;

20. a driving device; 21. a driving case; 211. a clamping groove; 212. a positioning groove; 213. a communication port; 214. a limit protrusion; 22. a rotor; 221. a rotating shaft; 2221. ball head; 222. a first magnet; 223. a second magnet; 23. a first driving 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 periphery; 2632. an outer peripheral edge; 264. a tubular portion; 265. an annular wall; 266. an annular groove; 271. a first sleeve; 2711. bowl-shaped grooves; 272. a second sleeve; 273. a shaft tube; 2721. a glue groove; 28. a fixing seat; 281. a mounting groove; 282. a through hole;

30. a sleeve assembly; 301. an inflow port; 302. an outflow port; 31. a cannula; 32. a connecting pipe; 33. an outlet tube; 321. a first pipe section; 322. a second pipe section; 323. a limit convex ring; 331. a connection part; 332. an outlet portion; 3231. a first end face; 3232. a second end face; 3233. a transition surface; 3233a, cylinder; 3233b, inclined plane; 3211. a hollow groove; 3212. a gap;

40. a catheter assembly.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should 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 the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

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

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the field of interventional medicine, it is common to define the end of the instrument proximal to the operator as the proximal end and the end distal to the operator as the distal end.

As shown in fig. 1 to 2, the blood pump according to one embodiment relates to an intravascular blood pump. The blood pump includes an impeller 10, a drive device 20, and a cannula assembly 30. The driving device 20 is in transmission connection with the impeller 10, and the driving device 20 can drive the impeller 10 to rotate. The sleeve assembly 30 is fixedly connected with the driving device 20, and the impeller 10 is rotatably arranged in the sleeve assembly 30.

The sleeve assembly 30 has an inflow port 301 and an outflow port 302, and when the impeller 10 rotates, blood can flow into the sleeve assembly 30 from the inflow port 301 and then flow out from the outflow 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 coupled to the distal end of the driver 20. In particular use, the sleeve 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.

Referring to fig. 2 to 6, the cannula assembly 30 includes a cannula 31, a connecting tube 32 and an outlet tube 33, wherein the cannula 31, the connecting tube 32 and the outlet tube 33 are hollow tubular structures, and the cannula 31 is sleeved with the connecting tube 32 so that an inner wall of one end of the connecting tube 32 is connected with an outer wall of the cannula 31. Specifically, the cannula 31 has a proximal end and a distal end, the proximal end of the cannula 31 being engaged with the adapter tube 32, wherein the inflow port 301 is located on the distal end of the cannula 31.

The outlet tube 33 includes a connection portion 331 near the adapter tube 32 and an outlet portion 332 remote from the adapter tube 32, and the outlet tube 33 is sleeved with the adapter tube 32 so that the outer wall of the connection portion 331 is connected with the inner wall of the end of the adapter tube 32 remote from the cannula 31. Wherein the end of the outlet portion 332 remote from the adapter tube 32 is fixedly connected to the drive device 20, and the impeller 10 is rotatably arranged in the outlet tube 33 or partly in the outlet tube 33 and partly in the cannula 31. The outflow opening 302 is located on the outlet 332. The plurality of outflow ports 302 are uniformly provided in the outlet portion 332 along the circumferential direction of the outlet tube 33, and the impeller 10 is driven to rotate by the driving device 20 so as to flow blood from the inflow port 301, through the cannula 31, and out of the plurality of outflow ports 302 of the outlet tube 33.

Because the traditional connection mode between the cannula 31 and the outlet pipe 33 is that the cannula 31 is directly sleeved on the outlet pipe 33, but because the cannula 31 is a flexible pipe, the outlet pipe 33 is a metal pipe, no matched assembly position exists, and the pipe diameters of the cannula 31 and the outlet pipe are different, the caliber of the port of the cannula 31 before connection needs to be enlarged through process molding to be matched with the outlet pipe 33, so that the cannula 31 can be sleeved on the outer wall of the outlet pipe 33, the process is complex, the connection is unstable, and the strength of the molded part is reduced.

The cannula 31 and the outlet tube 33 in the cannula assembly 30 provided in this embodiment are connected in transition through the connecting tube 32, the inner wall of one end of the connecting tube 32 is connected with the outer wall of the cannula 31, the outer wall of the connecting portion 331 of the outlet tube 33 is connected with the inner wall of the other end of the connecting tube 32, so that the cannula 31 and the outlet tube 33 are fixedly connected to form a coherent pipeline; the step of directly sleeving the cannula 31 and the outlet tube 33, which requires molding the cannula 31, is omitted, the connection is stable, and the assembly operation is simple.

As shown in fig. 3 to 6, the inner wall of the engagement tube 32 is provided with a limiting collar 323; specifically, the limiting convex ring 323 is arranged on the inner wall of the connecting tube 32 in a ring shape in a protruding way, and the limiting convex ring 323 and the connecting tube 32 are coaxial; the limiting collar 323 has a first end face 3231 and a second end face 3232 disposed along an axial direction of the engagement tube 32, the first end face 3231 abuts against an end portion of the insertion tube 31, the second end face 3232 abuts against an end portion of the connection portion 331, an outer diameter of the connection portion 331 is smaller than an outer diameter of the outlet portion 332, an end portion of the engagement tube 32, which is far away from the insertion tube 31, abuts against an end portion of the outlet portion 332, which is close to the end portion of the connection portion 331, and an outer wall of the engagement tube 32 is flush with an outer wall of the outlet portion 332.

Specifically, the inner diameters of the connection portion 331 and the outlet portion 332 are the same, and the limiting collar 323 has a certain thickness to form a first end face 3231 near the cannula 31 and a second end face 3232 near the outlet tube 33; when the cannula 31 and the outlet tube 33 are respectively sleeved in the connecting tube 32, the limiting convex ring 323 can limit the axial direction of the outlet tube 33 and the cannula 31 at the same time, so that the sleeve joint depth of the outlet tube 33 and the cannula 31 is controlled, the preset positioning function is realized, and the subsequent fixedly connecting operation is convenient; meanwhile, the end part of the connecting pipe 32 can be abutted against the end part of the outlet part 332 and is in combined action with the limiting convex ring 323, so that the limiting in two directions in the axial direction is formed, and the connecting pipe is more stable and matched; at this time, the outer wall of the connecting pipe 32 is flush with the outer wall of the outlet 332, so that the outer wall of the connecting pipe 32 and the outer wall of the outlet 33 are on the same cylindrical surface, and meanwhile, the cannula 31 is sleeved in the connecting pipe 32, so that the overall outer diameter of the connecting pipe 32 and the whole outer diameter of the connecting pipe 33 after being connected are effectively controlled, the outer diameters of the connecting pipe 32 and the outer diameter of the connecting pipe 33 tend to be consistent, the joint is smoother, and unsmooth entering of blood vessels of a human body and even scratching of the blood vessels caused by fluctuation fall are avoided.

In addition, as shown in fig. 2 to 4, 8 and 9, the impeller 10 includes the blades, and the end of the blade 11 at the end remote from the driving device 20 does not exceed the end of the connection portion 331 at the end remote from the driving device 20. Specifically, the impeller 10 further includes a hub 12, and the blades 11 are spirally wound around the hub 12. The impeller 10 is partially arranged in the outlet pipe 33, the driving device 20 drives the impeller 10 to rotate, and the impeller 10 rotates to vibrate to generate deflection, so that a certain distance is required to be arranged between the impeller 10 and the inner wall of the outlet pipe 33, and the blades 11 cannot collide with the inner wall of the outlet pipe 33 when the impeller 10 deflects to the maximum extent; since the limiting collar 323 narrows the inner wall of the connecting tube 32 and the blades 11 have a certain height in the axial direction of the outlet tube 33, the blades 11 occupy a certain width in the radial direction of the outlet tube 33, and the highest point of the blades 11 in the axial direction does not protrude from the outlet tube 33, so that the blades 11 do not contact the limiting collar 323.

Furthermore, the limiting convex ring 323 is not limited to the complete circular ring structure in the above embodiment, and may be a plurality of boss structures which are not connected with each other and are uniformly distributed at intervals, so that materials can be saved under the condition of ensuring limiting; the limiting collar 323 may be a structure separately connected to the connecting tube 32, or may be a structure integrally formed with the connecting tube 32, and the integrally formed strength is higher.

As shown in fig. 4, the inner diameter of the insertion tube 31 is smaller than the inner diameter of the outlet tube 33, and the width of the first end face 3231 in the radial direction is larger than the width of the second end face 3232 in the radial direction, so that the inner wall of the insertion tube 31 is flush with the edge of the first end face 3231, the inner wall of the outlet tube 33 is flush with the edge of the second end face 3232, and the stopper flange 323 further includes a transition face 3233, the transition face 3233 connecting the edge of the first end face 3231 and the edge of the end face of the second end face 3232.

Specifically, the dimensions and specifications of the cannula 31 and the outlet tube 33 are different, because the inner diameters of the cannula 31 and the outlet tube 33 are different, that is, the first end face 3231 protrudes from the inner wall of the connecting tube 32 in the radial direction relative to the second end face 3232, when the two end faces are respectively abutted against the limiting convex ring 323, the edge of the first end face 3231 is required to be flush with the inner wall of the cannula 31, and the edge of the second end face 3232 is required to be flush with the inner wall of the outlet tube 33, so that after the outlet tube 33 and the cannula 31 are abutted against the limiting convex ring 323, the blood flow channels formed by the inner walls of the cannula 31, the connecting tube 32 and the outlet tube 33 are more consistent, no dead angle is formed at the joint transition, and blood is prevented from entering the dead angle to cause blood blocking and thrombus.

More specifically, because the widths of the first end face 3231 and the second end face 3232 are different, a large vertical drop is formed between the distance from the first end face 3231 to the second end face 3232, and a dead angle is formed between the two because the direction of blood flow flows from the cannula 31 to the outlet tube 33, so that a gentle transition face 3233 is formed by connecting the edge of the first end face 3231 and the edge of the second end face 3232 through the transition face 3233, blood can directly flow along the transition face 3233, and dead angle is not formed, so that blood blocking and thrombus risks are avoided.

The transition surface 3233 may be a convex arc surface or a concave arc surface, which has better flow guiding effect on blood.

As shown in fig. 4, the transition surface 3233 has a cylindrical surface 3233a coaxial with the adapter tube 32 and a slope 3233b angled with respect to the axis of the adapter tube 32, one end of the cylindrical surface 3233a is connected to one end of the slope 3233b, one end of the cylindrical surface 3233a remote from the slope 3233b is connected to the edge of the first end surface 3231, the cylindrical surface 3233a is flush with the inner wall of the cannula 31, and one end of the slope 3233b remote from the cylindrical surface 3233a is connected to the edge of the second end surface 3232.

The transition surface 3233 is formed by two parts, one end of the cylindrical surface 3233a is connected to the edge of the first end surface 3231, and the cannula 31 is flush with the inner wall of the cannula 31 after being abutted against the first end surface 3231; flush means that the connection surface of the cylindrical surface 3233a and the cannula 31 is in smooth transition, and no undulating fall exists; because the transition of the cylindrical surface 3233a is performed when the limiting convex ring 323 is formed, the inclined surface 3233b is prevented from being directly connected with the edge of the first end surface 3231 to form a sharp corner structure at the connecting position, and the processing difficulty is low. The edges of the cylindrical surface 3233a and the second end surface 3232 are connected through the inclined surface 3233b, and at this time, the blood flows through the cylindrical surface 3233a and then flows along the inclined surface 3233b to the outlet tube 33, so that the cannula 31 and the outlet tube 33 with different inner diameters are connected through the limiting convex ring 323, the blood flow channel forms a coherent channel, the blood flows from the inner wall of the cannula 31 to the transition surface 3233 of the limiting convex ring 323 and then flows into the inner wall of the outlet tube 33, the whole process is unobstructed, and the generation of blood blocking and thrombus formation are avoided.

Further, the outlet tube 33 is a metal tube, and the cannula 31 is a flexible tube and has elasticity. In this embodiment, the outlet tube 33 is specifically a plastic tube, the connecting tube 32 is also a metal tube, and since two ends of the connecting tube 32 are respectively required to be joined with two different materials, in the joining process, the inner wall of one end of the connecting tube 32 is adhered and fixed to the outer wall of the insertion tube 31, and the end of the connecting tube 32 far away from the insertion tube 31 is welded and fixed to the outer wall of the connecting portion 331, so as to meet the process requirements, and the strength is ensured by sleeving the connecting tube 32 made of metal at the joint of the insertion tube 31 and the outlet tube 33.

As shown in fig. 4, the connecting tube 32 includes a first tube portion 321 and a second tube portion 322 that are connected to each other, wherein an inner wall of the first tube portion 321 is connected to an outer wall of the insertion tube 31, an inner wall of the second tube portion 322 is connected to an outer wall of the connecting portion 331, a limiting collar 323 is disposed on an inner wall of the second tube portion 322, outer diameters of the first tube portion 321 and the second tube portion 322 are the same, and an inner diameter of the first tube portion 321 is larger than an inner diameter of the second tube portion 322. The pipe wall thickness of the connecting pipe 32 is divided into two sections, the first pipe portion 321 with a thinner thickness is connected with the insertion pipe 31, the second pipe portion 322 with a thicker thickness is connected with the outlet pipe 33, the insertion pipe 31 is a flexible pipe and has elasticity, the curved human body blood vessel is easier to enter by virtue of the characteristics, the connecting pipe 32 is a metal pipe and is harder in material, the connecting pipe 32 is sleeved on the outer wall of the insertion pipe 31 in the axial direction of the connecting pipe, the nesting part is too stiff, and then the elasticity of the first pipe portion 321 is improved by reducing the thickness of the first pipe portion 321, so that the connecting pipe is not too hard and can adapt to deformation in the blood vessel entering the human body.

Further, a gap 3212 is provided between the inner wall of the first pipe portion 321 and the outer wall of the cannula 31. Certain gaps 3212 are reserved in the radial direction for dispensing operation between the first pipe portion 321 and the insertion pipe 31, and meanwhile, after the preset adhesive is fully dispensed, the outer wall of the first pipe portion 321 cannot be expanded outwards, so that the outer diameter of a dispensing position is prevented from being expanded.

Because the gap 3212 exists, after the cannula 31 and the connecting tube 32 are sleeved, the two cannot be guaranteed to be coaxial, and in a specific operation process, an auxiliary positioning tool is needed to realize the coaxial of the cannula 31 and the connecting tube 32, and the auxiliary positioning tool can be a cylindrical positioning column, and the outer diameter of the positioning column is the same as the inner diameter of the cylindrical surface 3233a of the cannula 31 or the limiting convex ring 323. Specifically, the positioning column is inserted into the cylindrical surface 3233a of the limiting convex ring 323 to attach the outer wall of the positioning column, then the insertion tube 31 is inserted into the cylindrical surface 3233a of the limiting convex ring to attach the inner wall of the insertion tube 31 to the outer wall of the positioning column, and then dispensing is performed in the gap 3212 between the insertion tube 31 and the connecting tube 32.

Further, as shown in fig. 7, a plurality of hollow grooves 3211 are formed in the first pipe 321. The hollow groove 3211 is a through groove penetrating through the inner wall and the outer wall of the first pipe portion 321, so that the area of the first pipe portion 321 can be effectively reduced, and the elasticity of the first pipe portion 321 is improved; meanwhile, in the dispensing process, dispensing can be performed in the hollow groove 3211 on the side surface of the first pipe portion 321, multi-azimuth operation dispensing can be performed, dispensing is more uniform, the adhesive effect is better, when the adhesive is heated and dried, the adhesive can expand, if the side surface of the first pipe portion 321 is a closed space, the outer diameter can be enlarged when the adhesive expands, and at the moment, the hollow groove 3211 can also accommodate a part of adhesive, so that the adhesive has an expandable space and can not expand the outer diameter.

The hollow groove 3211 may be an "I" straight groove or a meandering curved groove such as an "S" type or a "J" type. In arrangement, the hollowed-out grooves 3211 may be arranged along the radial direction of the connecting tube 32 or along the axial direction of the connecting tube 32.

The cannula 31 has a length such that the axial length of the first tube portion 321 is 50% -80% of the axial length of the second tube portion 322 in order to ensure better flexibility and ability to accommodate deformation of the cannula 31. That is, limiting the maximum and minimum axial lengths of the first tube portion 321, if the maximum axial length is exceeded, the length of the cannula 31 covered by the connecting tube 32 in the axial direction is too long, which can make the cannula 31 too stiff, reduce flexibility and ability to adapt to deformation, and may have difficulty in accessing a curved blood vessel; while below the minimum, the length of the engagement tube 32 covering the cannula 31 in the axial direction is too short, and the connection strength is low for a connection area with the cannula 31 to be easily broken.

As shown in fig. 8 to 18, the blood pump further includes a driving device 20, and 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 conductive member 25.

The drive housing 21 is a generally hollow cylindrical housing. The sleeve assembly 30 is fixedly connected with the driving housing 21. Specifically, the outlet portion 332 of the outlet tube 33 engages the distal end of the drive housing 21.

The rotor 22 is rotatably mounted to the drive housing 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 fixedly connected 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 rotation shaft 221 is accommodated in the driving housing 21, and a portion of the rotation shaft 221 extends out of the driving housing 21 to be fixedly connected with the impeller 10, so that the impeller 10 can rotate along with the rotation shaft 221.

The first driving unit 23 and the second driving unit 24 are mounted to the driving case 21, the first driving unit 23 and the second driving unit 24 are disposed along an extending direction of the rotation shaft 221, and the first driving unit 23 and the second driving unit 24 are located between the first magnet 222 and the second magnet 223.

The first driving unit 23 includes a first magnetic core 231 and a first coil 232, the number of the first magnetic cores 231 is plural, and the plurality of first magnetic cores 231 are 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 magnetic 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 second coils 242, the plurality of second magnetic cores 241 are disposed around the rotation shaft 221, and the second coils 242 are 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 magnetic core 231 and the second magnetic core 241 each extend in a direction parallel to the extending direction of the rotation shaft 221.

The magnetic conductive member 25 is fixedly accommodated in the driving housing 21, and the magnetic conductive 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 fixedly connected with the magnetic conductive member 25. The rotating shaft 221 rotatably penetrates through the magnetic conductive member 25, the first driving unit 23 and the second driving unit 24.

The magnetic conductive member 25 functions as a closed magnetic circuit to promote and increase generation of magnetic flux and enhance coupling capability. Also, since the magnetic flux can be increased by the magnetic conductive member 25, the provision of the magnetic conductive member 25 is advantageous in reducing the overall diameter of the driving 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 conductive member 25 is located 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 fixedly connected with the magnetic conductive member 25, so that the positioning and the installation of the first driving unit 23 and the second driving unit 24 in the driving shell 21 can be directly realized through the fixing of the magnetic conductive member 25, and meanwhile, the magnetic conductive member 25 also plays a role of closing a magnetic circuit between the first driving unit 23 and the first magnet 222, in other words, the magnetic conductive member 25 plays a role of closing a magnetic circuit between the second driving unit 24 and the second magnet 223, and the positioning and the installation of the first driving unit 23 and the second driving unit 24 can also be realized, so that the assembly difficulty of the first driving unit 23 and the second driving unit 24 is reduced.

In addition, the driving device 20 of the above-described structure can reduce the arrangement of the positioning structure on the driving case 21, thereby simplifying the structure of the driving case 21, while also simplifying the assembly process of the entire driving device 20.

Referring to fig. 10 to 11, a clamping groove 211 is formed in an inner wall of the driving housing 21, the clamping groove 211 can be engaged with the magnetic conductive member 25, and the magnetic conductive member 25 can be quickly and stably mounted in the driving housing 21 by being engaged with the clamping groove 211.

In the illustrated embodiment, the magnetically permeable member 25 includes a first magnetically permeable plate portion 251 and a second magnetically permeable plate portion 252, the first magnetically permeable plate portion 251 being laminated with the second magnetically permeable plate portion 252. The first magnetic conductive plate portion 251 is fixedly connected to the plurality of first magnetic cores 231, the second magnetic conductive plate portion 252 is fixedly connected to the plurality of second magnetic cores 241, and the rotation shaft 221 is rotatably inserted through the first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252. Wherein, edges of the first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252 are both engaged in the clamping 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 portion 251 and the second magnetic conductive plate portion 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 assembly is easier. Wherein, 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 that are close to each other abut.

Note that, the magnetic conductive member 25 is not limited to the above-described combination of the first magnetic conductive plate portion 251 and the second magnetic conductive plate portion 252, and the magnetic conductive member 25 may have a plate-like structure, and the first magnetic core 231 and the second magnetic core 241 may be connected to the magnetic conductive member 25 and extend reversely from two opposite surfaces of the magnetic conductive member 25, that is, the first driving unit 23 and the second driving unit 24 share one magnetic conductive member 25.

Referring to fig. 11 to 15, 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 connection strength of the first magnet 222 and the rotation shaft 221, and the second flywheel 262 can increase the connection strength of the second magnet 223 and the rotation shaft 221, thereby improving the rotation stability of the rotation shaft 221. Specifically, the first driving unit 23 and the second driving unit 24 are located between the first flywheel 261 and the second flywheel 262.

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

Referring to fig. 16 together, each of the first flywheel 261 and the second flywheel 262 includes an annular body 263, a tubular portion 264 and an annular wall 265. The tubular portion 264 is fixedly connected to an inner peripheral edge 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 jointly enclose an annular groove 266.

The first magnet 222 is installed in the annular groove 266 of the first flywheel 261, and 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, 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 assembly of the first magnet 222 and the second magnet 223.

Specifically, an end face of the first magnet 222, which is far from the annular body 263 of the first flywheel 261, is higher than an end face of the annular wall 265 of the first flywheel 261, which is far from the annular body 263 of the first flywheel 261. I.e., the end of the first magnet 222 remote from the annular body 263 is exposed to the annular groove 266 to facilitate the assembly of the first magnet 222 into the first flywheel 261.

Also, an end face of the second magnet 223, which is far from the annular body 263 of the second flywheel 262, is higher than an end face of the annular wall 265 of the second flywheel 262, which is far 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 understood that the first flywheel 261 and the second flywheel 262 are not limited to the above-described structure, and in some embodiments, one or both of the first flywheel 261 and the second flywheel 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, at which time the shaft 221 is fixedly threaded 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 rotation shaft 221 than the flywheel having only the annular body 263.

Specifically, the first magnet 222 and the second magnet 223 are each annular. The first magnet 222 and the second magnet 223 are arranged in a ring-shaped structure by a plurality of magnet blocks in a halbach array. In the illustrated embodiment, the first magnet 222 and the second magnet 223 each include eight magnet pieces that are arranged around the rotation shaft 221. Each magnet is a sector ring magnet, so that the magnet is in a circular ring structure.

It will be appreciated that in other embodiments, the first magnet 222 and the second magnet 223 may also be comprised of more or fewer magnet blocks, such as two, four, six, ten, etc.

Referring again to fig. 11, 12, 13 and 17, in the illustrated embodiment, the first magnetic core 231 and the second magnetic core 241 are each of a columnar structure, and the first magnetic core 231 and the second magnetic core 241 have no wider heads (i.e., pole pieces). That is, the widths of the first magnetic core 231 and the second magnetic core 241 are constant in the length direction, and the whole first magnetic core 231 and the second magnetic core 241 are magnetically coupled with the first magnet 222 and the second magnet 223 respectively, so that the magnetic losses of the first magnetic core 231 and the second magnetic core 241 with columnar structures can be reduced and the magnetic coupling density between the magnetic cores and the magnets can be increased compared with the magnetic cores provided with pole shoes, so that the torque of the stator to the first magnet 222 and the second magnet 223 (under the condition of equal current) can be increased. In addition, the first core 231 and the second core 241 without the head portions can also 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 generally triangular prism shape, and one edge of each of the first and second magnetic cores 231 and 241 faces the axis of the rotating shaft 221.

Specifically, edges of the first magnetic core 231 and the second magnetic core 241 are rounded to facilitate winding of the first coil 232 and the second coil 242, and to protect 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, or the like.

It will be appreciated that in other embodiments, the first and second magnetic cores 231, 241 may further comprise a post and a head disposed at one end of the post, with the first or second coils 232, 242 disposed around the post and the magnetically permeable member 25 engaged with the end of the post remote from the head.

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

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

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

Referring to fig. 11 and 12, the driving device 20 further includes a first shaft sleeve 271 fixedly received in the driving housing 21, a ball head 2211 is disposed at an end of the rotating shaft 221 adjacent to the first shaft sleeve 271, a bowl-shaped groove 2711 capable of partially receiving the ball head 2211 is disposed in the first shaft sleeve 271, and the ball head 2211 is rotatably disposed in the bowl-shaped groove 2711, so that the rotating shaft 221 is rotatably mounted in the driving housing 21 through the first shaft sleeve 271, and has an axial limiting function on the rotating shaft 221. Specifically, one end of the rotating shaft 221, which is close to the first magnet 222, extends out of the driving shell 21 and is fixedly connected with the impeller 10, the first shaft sleeve 271 is positioned at the other end of the rotating shaft 221, the ball head 2711 is hemispherical, the diameter of the ball head 2711 is larger than that of the rotating shaft 221, one side of the ball head 2711, which is far away from the first shaft sleeve 271, is abutted against the second flywheel 262, the rotating shaft 221 is limited in the axial direction, and the second flywheel 262 and the first shaft sleeve 271 are separated from each other, so that interference friction cannot be generated; the bottom of bowl-shaped slot 2711 is also connected to the shaft bore for the passage of cleaning fluid.

The driving device 20 further includes a fixing base 28 fixedly mounted on the driving housing 21, and a mounting groove 281 for accommodating the first shaft sleeve 271 is formed in the fixing base 28. In this way, the first shaft sleeve 271 is fitted to the fixing base 28 through the fitting groove 281, so that the first shaft sleeve 271 is fitted to the driving housing 21 through the fixing base 28, and the fitting difficulty of the first shaft sleeve 271 is reduced.

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

Referring to fig. 11 and 15, the driving housing 21 includes a distal shaft tube 273, the distal end of the shaft tube 273 is connected to an outlet portion 332 of the outlet tube 33, a communication port 213 is formed in the shaft tube 273, the driving device 20 further includes a second shaft sleeve 272 fixedly mounted in the shaft tube 273, the second shaft sleeve 272 is disposed at the communication port 213, and the rotating shaft 221 can rotatably pass through the second shaft sleeve 272.

Specifically, the second sleeve 272 is cylindrical, and a shaft hole through which the rotation shaft 221 passes is formed in the middle of the second sleeve 272. Specifically, the second shaft sleeve 272 is a ceramic sleeve or a metal sleeve.

Specifically, referring to fig. 11 to 14, a thrust ring 214 is further disposed in the shaft tube 273, the second sleeve 272 abuts against the thrust ring 214, so that the position of the second sleeve 272 in the driving housing 21 is axially positioned, so that the second sleeve 272 is mounted conveniently, the thrust ring 214 abuts against the first flywheel 261, and the second sleeve 272 and the first flywheel 261 can be separated from each other, and friction is generated due to no direct contact between the two.

Specifically, an adhesive groove 2721 is formed on the outer peripheral surface of the second sleeve 272, so as to fixedly connect the second sleeve 272 with the driving housing 21 in a dispensing manner.

As shown, the blood pump 100 further includes a catheter assembly 40, the distal end of the catheter assembly 40 being connected to the proximal end of the drive device 20, and in particular the distal end of the catheter assembly 40 being connected to the proximal end of the drive housing 21. Wherein the conduit assembly 40 is adapted to house various supply lines. For example, the supply line comprises an electrical connection line for electrical connection with the drive device 20 and a washing line for feeding the blood pump 100 with a washing fluid.

The cleaning fluid introduced into the cleaning line is able to flow through the interior of the drive housing 21 and then out of the gap between the second hub 272 and the shaft 221 into the sleeve assembly 30. On the one hand, the introduction of the washing fluid prevents the penetration of blood from the drive housing 21 into the drive device 20, and on the other hand, the washing fluid also acts as a lubricant between the shaft 221 and the second sleeve 272.

Specifically, the gap between the rotation shaft 221 and the second sleeve 272 is less than or equal to 2 micrometers. As such, the smallest red blood cells (about 8 microns in diameter and about 2 microns in thickness) have difficulty entering and blocking the gap between the shaft 221 and the second hub 272, and because of the width limitations 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, specifically, the fixing base 28 is provided with a through hole 282, the through hole 282 is communicated with the inner cavity of the driving housing 21, and the distal end of the cleaning line is accommodated in the through hole 282.

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

In order to avoid contamination of the cleaning fluid and/or corrosion of components in the driving device 20, the driving device 20 further comprises 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 silica gel, a film formed by curing glue, and the like.

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

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. A cannula assembly comprising:

a cannula;

the inner wall of one end of the connecting pipe is connected with the outer wall of the cannula;

the outlet pipe is sleeved with the connecting pipe, the outlet pipe comprises a connecting part and an outlet part far away from the connecting pipe, and the outer wall of the connecting part is connected with the inner wall of one end, far away from the cannula, of the connecting pipe.

2. The cannula assembly according to claim 1, wherein the inner wall of the adapter tube is provided with a limit collar, the limit collar has a first end face and a second end face arranged along the axial direction of the adapter tube, the first end face is abutted against the end of the cannula, and the second end face is abutted against the end of the connecting portion; the outer diameter of the connecting portion is smaller than that of the outlet portion, the end portion, away from one end of the insertion tube, of the connecting tube is abutted to the end portion, close to one end of the connecting portion, of the outlet portion, and the outer wall of the connecting tube is flush with the outer wall of the outlet portion.

3. The cannula assembly of claim 2, wherein the cannula has an inner diameter that is smaller than an inner diameter of the outlet tube, a width of the first end face in a radial direction that is greater than a width of the second end face in a radial direction such that an inner wall of the cannula is flush with an edge of the first end face and an inner wall of the outlet tube is flush with an edge of the second end face, the stop collar further comprising a transition surface connecting an edge of the first end face and an edge of the second end face.

4. A cannula assembly according to claim 3, wherein the transition surface has a cylindrical surface coaxial with the adapter tube and a bevel surface angled with respect to the axis of the adapter tube, one end of the bevel surface being connected to one end of the cylindrical surface, one end of the cylindrical surface remote from the bevel surface being connected to the edge of the first end surface, the cylindrical surface being flush with the inner wall of the cannula, one end of the bevel surface remote from the cylindrical surface being connected to the edge of the second end surface.

5. The cannula assembly of any of claims 2-4, wherein the adapter tube comprises a first tube portion and a second tube portion that are connected to each other, wherein an inner wall of the first tube portion is connected to an outer wall of the cannula, an inner wall of the second tube portion is connected to an outer wall of the connecting portion, the limiting collar is disposed on the inner wall of the second tube portion, outer diameters of the first tube portion and the second tube portion are the same, and an inner diameter of the first tube portion is larger than an inner diameter of the second tube portion.

6. The cannula assembly of claim 5, wherein the axial length of the first tube portion is 50% -80% of the axial length of the second tube portion.

7. The cannula assembly of claim 1, wherein the adapter tube is provided with a plurality of hollowed-out grooves, and the hollowed-out grooves are arranged on the connecting part of the adapter tube and the cannula.

8. The cannula assembly of claim 1, wherein the adapter tube and the outlet tube are metal tubes, the cannula is a flexible tube, an inner wall of one end of the adapter tube is adhesively secured to an outer wall of the cannula, and an end of the adapter tube distal from the cannula is welded to an outer wall of the connection.

9. A blood pump, comprising:

an impeller;

the driving device is in transmission connection with the impeller and can drive the impeller to rotate; and

a sleeve assembly according to any one of claims 1 to 8, wherein the outlet portion of the outlet tube is fixedly connected to the drive means, and the impeller is rotatably disposed in the outlet tube.

10. The blood pump of claim 9, wherein the impeller includes a blade, an end of the blade distal from the end of the drive means not exceeding an end of the connection portion distal from the end of the drive means.

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