CN219847840U - Impeller assembly, pump head and interventional catheter device - Google Patents

Abstract

The utility model discloses an impeller assembly, a pump head and an interventional catheter device, wherein the impeller assembly comprises a driving shaft, an impeller and a magnetic attraction structure, the proximal end of the driving shaft is connected with a motor so as to receive the rotation power of the motor, and the driving shaft comprises a hard shaft; the impeller is provided with a mounting channel in a penetrating way along the axial direction of the impeller, the mounting channel is used for the hard shaft to penetrate so that the impeller is driven by the driving shaft to rotate, the impeller comprises at least two impeller monomers, each impeller monomer comprises a hub monomer and blades formed on the radial outer wall of the hub monomer, and each hub monomer is enclosed together to define the mounting channel; the magnetic attraction structure magnetically attracts and fixes every two adjacent impeller monomers. According to the utility model, each hub monomer can be spliced, and the magnetic attraction structure is used for carrying out magnetic attraction fixation on every two adjacent impeller monomers, so that each hub monomer is connected around the outer side of the hard shaft to form an impeller whole, the installation of the hard shaft and the impeller is more conveniently completed, and the installation efficiency and the installation yield are improved.

Description

Impeller assembly, pump head and interventional catheter device

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an impeller assembly, a pump head and an interventional catheter device.

Background

Heart disease, represented by heart failure, is a major health problem leading to high mortality rates. While heart transplantation (Heart Transplantation, HT) is the best option for treating end-stage heart failure, the development and use of HT is hampered by the limited organ donor. Ventricular assist, in particular left ventricular assist devices (Left Ventricular Assist Device, LVAD), have demonstrated its value in heart failure patients who are not fit for HT. Thus, in the face of such patients, there is an urgent need to clinically support the treatment of heart failure using mechanical ventricular assist devices, and to rapidly and minimally invasively deploy therapeutic regimens.

A traditional mechanical device for treating the above-mentioned diseases is an intrA-Aortic balloon pump (IABP), which is placed in the aorta and actuated in an anti-pulse manner to provide partial support to the circulatory system. However, IABP is capable of providing very small flows (typically around 0.5L/min). Therefore, in practice, the IABP is difficult to independently play or take on the ventricular assist function, and in many cases, only plays a role in regulating flow and pressure.

To this end, minimally invasive rotary catheter pumps have been developed in which the impeller assembly can be inserted into the ventricle. The catheter pump can provide higher flow and further has wide application prospect. Currently, catheter pumps in this field are classified as being built-in and non-collapsible in motors and being built-out and collapsible in motors. The latter can be folded, so that the advantages of smaller wound and more convenient and quick use can be achieved during the intervention.

As a known embodiment of publication number CN114010937a, a catheter pump is provided which achieves a small intervention size, the general working principle of which is: the motor transmits rotational power to the distal impeller through the drive shaft, and rotation of the impeller provides flow power to the blood, pumping it from the left ventricle pump into the aorta. The driving shaft comprises a flexible shaft penetrating through the catheter and a hard shaft connected to the far end of the flexible shaft, and the hub of the impeller is sleeved on the hard shaft, so that the impeller is fixedly connected with the driving shaft.

As in the known embodiment of publication No. CN216934447U, it is basically disclosed that when the impeller rotates, blood is pumped proximally, and the blood exerts a counter force on the impeller, which in turn tends to move distally. In this known embodiment, by distal limiting the hard shaft, undesired distal movement of the impeller is prevented, thereby avoiding scraping of the pump housing by the impeller, ensuring that pumping continues to occur effectively.

In the prior art, a mounting channel is penetrated through the hub along the circumferential direction of the hub, and a hard shaft is penetrated in the mounting channel, so that certain difficulty exists in the operation of penetrating the hard shaft in the mounting channel due to the small overall size of the impeller assembly.

Disclosure of Invention

The utility model mainly aims to provide an impeller assembly, a pump head and an interventional catheter device, and aims to provide a simpler installation mode between a hub and a hard shaft.

To achieve the above object, the present utility model provides an impeller assembly, comprising:

a drive shaft having a proximal end for connection to a motor for receiving rotational power from the motor, the drive shaft including a hard shaft proximate a distal end thereof;

the impeller is provided with a mounting channel along the axial direction of the impeller in a penetrating way, and the mounting channel is used for the hard shaft to penetrate through so that the impeller is driven by the driving shaft to rotate, wherein the impeller comprises at least two impeller monomers, each impeller monomer comprises a hub monomer and blades formed on the radial outer wall of the hub monomer, and the hub monomers are enclosed together to define the mounting channel; the method comprises the steps of,

the magnetic attraction structure is used for magnetically attracting and fixing every two adjacent impeller monomers.

Optionally, the magnetic attraction structure is mounted between every two adjacent hub units.

Optionally, the magnetic attraction structures are at least two, and each magnetic attraction structure is arranged on the hub monomer in a one-to-one correspondence manner.

Alternatively, the magnetic attraction structures on every two adjacent hub monomers are magnets with opposite magnetic poles.

Optionally, one of the magnetic attraction structures on every two adjacent hub monomers is a magnet, wherein the other magnetic attraction structure is made of iron metal, cobalt metal and/or nickel metal.

Optionally, at least one of the magnetic attraction structures on every two adjacent hub monomers is a magnet, and the hard shaft is made of iron metal, cobalt metal and/or nickel metal.

Optionally, the magnetic attraction structure is suitable for extending in an arc shape corresponding to the shape of the hub unit.

Optionally, the hub monomer wraps the entire outer surface of the corresponding magnetic structure.

In addition, to achieve the above object, the present utility model provides a pump head comprising a pump housing for connection to a distal end of a catheter in an interventional catheter device, and an impeller assembly as described in any of the above.

In addition, to achieve the above object, the present utility model provides an interventional catheter device comprising a catheter, a motor and a pump head as described above, the pump head being deliverable to a desired location of a heart of a subject through the catheter and pumping blood, an impeller assembly being driven by the motor.

In the technical scheme provided by the utility model, the impeller comprises a plurality of impeller monomers, wherein each impeller monomer at least comprises a hub monomer, and blades integrally formed with the hub monomer can be further included according to actual design requirements. The radial inner side walls of the hub monomers are arc surfaces, and part of the inner walls of the mounting channels along the circumferential direction of the mounting channels are respectively formed. When the hard shaft and the impellers are required to be installed, the hub monomers can be spliced, and the magnetic attraction structure is used for carrying out magnetic attraction fixation on every two adjacent impeller monomers, so that the hub monomers are connected around the outer side of the hard shaft to form an impeller whole, the operation of penetrating the hard shaft into an installation channel with smaller inner diameter is not required, the installation operation of the hard shaft and the impellers is simplified, and the installation efficiency and the installation yield are improved.

Drawings

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

FIG. 1 is a schematic perspective view of an interventional catheter device according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a partial structure of a working assembly of the interventional catheter device of FIG. 1;

FIG. 3 is a schematic view of a part of the pump head of FIG. 2

FIG. 4 is a schematic illustration of the pump head of FIG. 1 in exploded view;

FIG. 5 is a schematic view of a portion of the impeller assembly of FIG. 1;

FIG. 6 is a schematic partial cross-sectional view of the first embodiment of FIG. 5 at A-A, wherein the impeller assembly is not assembled;

FIG. 7 is a schematic partial cross-sectional view of the first embodiment of FIG. 5 at A-A, wherein the impeller assembly is assembled;

FIG. 8 is a schematic partial cross-sectional view of the second embodiment of FIG. 5 at A-A, wherein the impeller assembly is not assembled;

fig. 9 is a schematic partial cross-sectional view of the second embodiment of fig. 5 at A-A, wherein the impeller assembly is assembled.

Reference numerals illustrate:

1 a catheter pump; 100 drive assembly; 110 motor housing; 200 working components; 211 a catheter; 212 drive the catheter handle; 221 proximal bearing; 222 distal bearings; 223 proximal bearing chamber; 224 distal bearing chamber; 231 stops; 232 limit; 240 protecting the head; 30 pump heads; 310 pump housing; 311 liquid inlet; 312 outlet; 320 brackets; 330 coating; 40 impeller assembly; 410 a drive shaft; 411 hard shaft; 412 a flexible shaft; 420 impellers; 421 impeller units; 422a first hub unit; 422b a second hub unit; 422c mounting channels; 423 blades; 431 a first magnetic structure; 432 a second magnetic structure; 433 a third magnetic attraction structure.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1-9, the present utility model provides an impeller assembly 40, wherein the impeller assembly 40 is mainly used at a pump head 30, and the pump head 30 is mainly used in an interventional catheter device, such as an interventional catheter pump 1.

The catheter pump 1 in the embodiment of the utility model can at least partially assist the pumping function of the heart, and realize the effect of at least partially reducing the burden of the heart. In an exemplary scenario, catheter pump 1 may be used as a left ventricular assist, and its working portion (specifically, for example, pump head 30 provided with pump head 30) may be interposed in the left ventricle, and pump head 30 may be operated to pump blood in the left ventricle into the ascending aorta.

It is noted that the above example is used as left ventricular assist only as a viable applicable scenario for the present catheter pump 1. In other possible and not explicitly excluded scenarios, catheter pump 1 may also be used as a right ventricular assist, pump head 30 may be inserted into the right ventricle, and pump head 30 operates to pump venous blood into the right ventricle. Of course, the catheter pump 1 may also be applied to assist the kidney as a kidney pump.

The following will mainly describe the scenario in which the present catheter pump 1 is used as left ventricular assist. It will be appreciated from the foregoing that the scope of embodiments of the utility model is not limited thereby.

As shown in fig. 1, catheter pump 1 includes a drive assembly 100 and a working assembly 200. The driving assembly 100 includes a motor housing 110, a motor (not shown) received in the motor housing 110, and a driving member (not shown) driven by the motor. As shown in connection with fig. 2 and 3, the working assembly 200 includes a catheter 211, a drive shaft 410 disposed through the catheter 211, a follower coupled to a proximal end of the drive shaft 410, and a drive catheter handle 212 and pump head 30 coupled to a proximal end and a distal end of the catheter 211, respectively. The pump head 30 includes a pump housing 310 having a liquid inlet 311 and a liquid outlet 312, and an impeller 420 received in the pump housing 310, the impeller 420 being connected to a distal end of a drive shaft 410. When the impeller 420 rotates, blood is sucked into the pump housing 310 from the inlet 311, and is pumped out of the pump housing 310 from the outlet 312.

The pump housing 310 includes a holder 320 and an elastic coating 330 coated on the holder 320. The metal lattice of the supporter 320 has a mesh design, the cover 330 covers the middle and rear end portions of the supporter 320, and meshes of the portion of the front end of the supporter 320 not covered by the cover 330 form the liquid inlet 311. The rear end of the covering film 330 is covered outside the distal end of the catheter 211, and the liquid outlet 312 is an opening formed at the rear end of the covering film 330.

The impeller 420 includes a hub and blades 423 supported on the outer wall of the hub. The blades 423 are made of a flexible material, and thus form the foldable pump head 30 with the supporter 320 and the cover 330 made of the nickel, titanium memory alloy.

Of course, the pump head 30 may be non-collapsible. Accordingly, the pump housing 310 may be a metal sleeve that is not radially collapsible and self-expanding. Impeller 420 is also made of a hard but biocompatible material.

The driving shaft 410 comprises a flexible shaft 412 which can be bent and a hard shaft 411 connected to the distal end of the flexible shaft 412, the flexible shaft 412 is penetrated in the catheter 211, the hard shaft 411 is penetrated in the hollow channel of the hub, and the outer wall of the hard shaft 411 and the inner wall of the hollow channel of the hub are fixed by bonding.

The proximal and distal ends of the holder 320 are connected to the proximal and distal bearing chambers 223 and 224, respectively, and the proximal and distal bearings 221 and 222 are provided in the proximal and distal bearing chambers 223 and 224, respectively. The proximal and distal ends of hard shaft 411 are threaded into proximal bearing 221 and distal bearing 222, respectively. Thus, the two ends of the hard shaft 411 are supported by the two bearings, and the high rigidity of the hard shaft 411 allows the impeller 420 to be preferably held in the pump housing 310.

As in CN114225213a, the proximal bearing housing 223 can be an additional component connected between the distal end of the catheter 211 and the stent 320. Of course, the proximal bearing housing 223 may also be part of the structure of the stent 320, formed by the proximal hypotube of the stent 320.

The hard shaft 411 is provided with a stop portion 231 located at the proximal side of the proximal bearing 221, and is used for limiting the distal movement of the hard shaft 411 and the impeller 420 to 232, so as to prevent the impeller 420 from moving distally due to the reverse action of blood when the impeller 420 pumps blood. The hard shaft 411 is further provided with a limiting portion 232 located near the stopping portion 231, and the limiting portion 232 is used for limiting the movement of the hard shaft 411 and the stopping portion 231 in the proximal direction, so that the stopping portion 231 is prevented from being biased against the distal end of the catheter 211 to release particulate matters.

The distal end of the distal bearing chamber 224 is provided with a protective head 240 made of flexible material, and the protective head 240 can be supported on the inner wall of the ventricle in a non-invasive or non-invasive manner, so that the liquid suction inlet 311 of the pump head 30 is separated from the inner wall of the ventricle, and the liquid suction inlet 311 is prevented from being attached to the inner wall of the ventricle due to the reaction force of blood in the working process of the pump head 30, thereby ensuring the pumping area.

The drive catheter handle 212 and drive assembly 100 are removably coupled in a manner that may be a lock nut or a snap-fit connection as provided in US9421311B 2. The driven member is non-contact coupled with the driving member to transmit the rotation power of the motor to the driving shaft 410, thereby driving the impeller 420 to rotate and pump blood. As described above, the driven member and the driving member may be magnetically coupled to each other as provided in CN103120810B or CN101820933B, or may be coupled to an eddy current coupler (Eddy Current Coupling) as provided in CN216061675U or CN114452527a, which is not limited in this embodiment.

The above is a collapsible tube pump 1, the pump housing 310 being collapsible together with the impeller 420. It should be noted that the application scenario of the embodiment of the present utility model is not limited thereto. In fact, the non-collapsible catheter pump 1 is equally applicable to the solution of the utility model.

Similarly, the catheter pump 1 is an external motor. Based on the above, the catheter pump 1 may be configured to have a built-in motor. At this point, the motor is coupled to the distal end of the catheter 211, and the elongate flexible drive shaft 410 is no longer threaded within the catheter 211, and the motor drives the impeller 420 by way of a stiff stub, magnetic coupling, or the like.

The mounting manner between the impeller 420 and the hard shaft 411 affects whether axial movement is easy to occur between the two to a certain extent, for example, when the mounting between the hard shaft 411 and the hub is realized by passing the hard shaft 411 through the hub in the prior art, if the outer diameter of the hard shaft 411 is smaller than the inner diameter of the hub, convenient mounting of the hard shaft 411 and the hub is facilitated to a certain extent, but a gap is easy to form between the radial outer side wall of the hard shaft 411 and the radial inner side wall of the hub, and then in the long-term use process, the gap increases due to material expansion and other reasons, so that the impeller 420 is axially displaced relative to the hard shaft 411; conversely, if the outer diameter of the hard shaft 411 is larger than the inner diameter of the hub, the probability of relative axial displacement between the hard shaft 411 and the hub is reduced to some extent, but the convenient installation of the hard shaft 411 and the hub is not facilitated.

Therefore, the impeller assembly 40 provided by the present utility model is mainly used for overcoming the defect that the impeller 420 and the hard shaft 411 are inconvenient to be assembled and disassembled in the prior art.

It should be noted that the impeller assembly 40 generally has a liquid inlet end and a liquid outlet end. The impeller assembly 40 may be a centrifugal impeller assembly or an axial impeller assembly in accordance with its operating mechanism. When the impeller assembly 40 is a centrifugal impeller assembly, the liquid inlet end of the impeller assembly 40 is positioned at the shaft end, and the liquid outlet end of the impeller assembly 40 is positioned at the peripheral side, so that blood can be guided to enter from the axial direction and be centrifugally thrown out through the peripheral side; when the impeller assembly 40 is an axial flow impeller assembly, the liquid inlet end of the impeller assembly 40 is located at one axial end thereof, and the liquid outlet end of the impeller assembly 40 is located at the other axial end thereof, so as to be capable of guiding blood to enter and exit along the axial direction thereof.

Since the improvement of the present design is mainly applied to limit the axial movement of the impeller 420 relative to the hard shaft 411, the following embodiments will mainly be directed to the improvement of the axial flow impeller assembly, and the liquid inlet end of the impeller assembly 40 is disposed near the liquid inlet 311 of the pump casing 310, and the liquid outlet end of the impeller assembly 40 is disposed near the liquid outlet 312 of the pump casing 310.

Referring to fig. 4 to 7, the impeller assembly 40 provided by the present utility model includes a driving shaft 410, an impeller 420 and a magnetic attraction structure. Wherein the proximal end of the drive shaft 410 is adapted to be coupled to a motor to receive the rotational power of the motor, the drive shaft 410 including a hard shaft 411 near its distal end; the impeller 420 is provided with a mounting channel 422c along the axial direction thereof in a penetrating way, the mounting channel 422c is used for the hard shaft 411 to penetrate through, so that the impeller 420 is driven by the driving shaft 410 to rotate, wherein the impeller 420 comprises at least two impeller monomers 421, the impeller monomers 421 comprise hub monomers and blades 423 formed on the radial outer wall of the hub monomers, and each hub monomer is enclosed together to define the mounting channel 422c; the magnetic attraction structure is used for magnetically attracting and fixing every two adjacent impeller monomers 421.

In the technical scheme provided by the utility model, the impeller 420 comprises a plurality of impeller monomers 421, wherein the impeller monomers 421 at least comprise hub monomers, and blades 423 integrally formed with the hub monomers can be further included according to actual design requirements; the radial inner side walls of the hub monomers are arc-shaped and respectively form part of the inner walls of the mounting channels 422c along the circumferential direction; when the hard shaft 411 and the impeller 420 need to be installed, each hub monomer can be spliced, and the magnetic attraction structure is used for carrying out magnetic attraction fixation on every two adjacent impeller monomers 421, so that each hub monomer is connected around the outer side of the hard shaft 411 to form an impeller 420 whole, the operation of penetrating the hard shaft 411 into the installation channel 422c with smaller inner diameter is not needed, the installation operation of the hard shaft 411 and the impeller 420 is simplified, and the installation efficiency and the installation yield are improved.

For ease of understanding, in the following embodiments, every two adjacent hub monomers are defined as a first hub monomer 422a and a second hub monomer 422b.

The structural parameters such as the size, shape, and material of first hub unit 422a and second hub unit 422b may be the same or different. For example, as shown in fig. 6 to 9, the cross sections of the first hub unit 422a and the second hub unit 422b are approximately semicircular, and the two units are spliced and then enclosed to form a mounting channel 422c with a circular cross section.

In addition, blades 423 with the same shape, the same size, the same number and the same position can be arranged on each hub monomer; or a part of the hub single body is provided with the blades 423 according to actual needs, and a part of the hub single body is provided with no blades 423.

The blades 423 and the hub monomers can be integrally formed, or can be detachably connected or fixedly connected after being separately arranged.

Since first hub unit 422a and second hub unit 422b have substantially adjacent, coupled end surfaces, a magnetic attraction structure is generally disposed on first hub unit 422a and second hub unit 422b. Of course, if the ends of blades 423 of both first hub unit 422a and second hub unit 422b are sufficiently close, the magnetic attraction structure may be further disposed at the ends of two adjacent blades 423 to increase the connection strength between two impeller units 421.

Referring to fig. 6 to fig. 7, in an embodiment, at least two magnetic structures are provided, and each magnetic structure is disposed on each hub unit in a one-to-one correspondence. The structural parameters of each magnetic attraction structure on each corresponding hub monomer can be set to be identical or different according to actual needs.

For ease of understanding, the magnetic attraction structure provided to the first hub unit 422a is defined as a first magnetic attraction structure 431, and the magnetic attraction structure provided to the second hub unit 422b is defined as a second magnetic attraction structure 432. However, when the first hub unit 422a carries the first magnetic structure 431 and the second hub unit 422b carries the second magnetic structure 432 to splice with each other, the first hub unit 422a and the second hub unit 422b can be fixedly connected by means of the splicing operation. And, through the structure setting is inhaled to the magnetism on the wheel hub monomer that corresponds, need not to inhale the structure for the magnetism and additionally set up accommodation space, and make first magnetism inhale structure 431 and second magnetism inhale the structure 432 and more stable to the connection between first wheel hub monomer 422a and the second wheel hub monomer 422b.

Further, in an embodiment, the magnetic attraction structures on every two adjacent hub units are magnets with opposite magnetic poles. That is, for example, the side of the first magnetic attraction structure 431 facing the second magnetic attraction structure 432 is an N pole, the side of the second magnetic attraction structure 432 facing the first magnetic attraction structure 431 is an S pole, and the mutual attraction of the first hub unit 422a and the second hub unit 422b is realized by the mutual attraction of the N pole and the S pole.

Or in one embodiment, one of the magnetic attraction structures on every two adjacent hub monomers is a magnet, wherein the other magnetic attraction structure is made of iron metal, cobalt metal and/or nickel metal. That is, for example, the first magnetic attraction structure 431 is a magnet, and the second magnetic attraction structure 432 is made of a material containing at least one of iron, cobalt, and nickel metals, and is magnetically attracted by the magnet.

In one embodiment, when at least one of the magnetic attraction structures on each two adjacent hub units is a magnet, the hard shaft 411 is made of a material including iron metal, cobalt metal and/or nickel metal. In this way, when the first hub unit 422a and the second hub unit 422b are magnetically attracted and fixed by the first magnetic attraction structure 431 and the second magnetic attraction structure 432, a certain magnetic attraction force can be applied to the hard shaft 411 at the same time, so that the first hub unit 422a and the second hub unit 422b are connected and fixed with each other, and meanwhile, the first hub unit 422a and the second hub unit 422b can be fixed on the hard shaft 411, so that the fixed connection of the three can be realized.

In addition, in an embodiment, the magnetic attraction structure is suitable for extending in an arc shape of the corresponding hub unit. In this way, the magnetic attraction structure can be distributed as much as possible around the mounting channel 422c formed by the hub units, which is helpful to increase the connection stability among the first hub unit 422a, the second hub unit 422b and the hard shaft 411.

Based on any of the above embodiments, the hub unit may have a mounting groove formed on a surface thereof, and the corresponding magnetic structure is fixedly mounted in the mounting groove, and one side of the magnetic structure is exposed, so that a better magnetic effect of the magnetic structure is achieved.

Alternatively, in an embodiment, the hub unit wraps the entire outer surface of the corresponding magnetic structure. The scheme for realizing the mode is as follows: for example, the hub unit may directly form a mounting cavity in the hub unit or define a mounting cavity by means of assembly, etc., and the corresponding magnetic structure is accommodated in the mounting cavity to accommodate and mount the magnetic structure. Or for example, in the injection molding process of the hub monomer, the magnetic attraction structure is placed in the molding cavity of the hub monomer, so that the hub monomer and the magnetic attraction structure are integrally formed.

In addition, referring to fig. 7 to 8, in an embodiment, a magnetic attraction structure (hereinafter, the magnetic attraction structure is defined as a third magnetic attraction structure 433 for convenience of understanding) may be separately provided from the first hub unit 422a and the second hub unit 422b, and when the first hub unit 422a and the second hub unit 422b need to be assembled, the third magnetic attraction structure 433 is installed between every two adjacent hub units. When the third magnetic structure 433 is a magnet, the materials of the first hub unit 422a, the second hub unit 422b, and the hard shaft 411 may include iron-cobalt-nickel metal, so that the first hub unit 422a, the second hub unit 422b, and the hard shaft 411 are all magnetically fixed by the third magnetic structure 433.

It should be noted that, the magnet may be a common structure such as a magnet, or may be an electromagnet, and by arranging a power supply circuit for the electromagnet, the electromagnet is controlled to be powered on or powered off, so that flexible disassembly and assembly between the first hub unit 422a and the second hub unit 422b and/or between each hub unit and the hard shaft 411 may be flexibly controlled.

The present utility model further provides a pump head 30, the pump head 30 comprising a pump housing 310 and an impeller assembly 40 as described above, wherein the pump housing 310 is adapted to be coupled to a distal end of a catheter 211 in an interventional catheter device. It should be noted that, the detailed structure of the impeller assembly 40 in the pump head 30 can refer to the embodiment of the impeller assembly 40 described above, and will not be described herein again; because the impeller assembly 40 is used in the pump head 30 of the present utility model, the embodiments of the pump head 30 of the present utility model include all the technical solutions of all the embodiments of the impeller assembly 40, and the achieved technical effects are identical, and are not described in detail herein.

Furthermore, the present utility model provides an interventional catheter device, such as in particular the catheter pump 1 described above, the catheter pump 1 may include, but is not limited to, a catheter 211, a motor and a pump head 30 as described above, the pump head 30 being capable of being delivered to a desired location of the subject's heart via the catheter 211 and pumping blood. It should be noted that, the detailed structure of the pump head 30 in the interventional catheter device can refer to the embodiment of the pump head 30 described above, and will not be described herein again; because the pump head 30 is used in the interventional catheter device of the present utility model, the embodiments of the interventional catheter device of the present utility model include all the technical solutions of all the embodiments of the pump head 30, and the achieved technical effects are identical, and are not described in detail herein.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims (10)

1. An impeller assembly, comprising:

a drive shaft having a proximal end for connection to a motor for receiving rotational power from the motor, the drive shaft including a hard shaft proximate a distal end thereof;

the impeller is provided with a mounting channel along the axial direction of the impeller, and the mounting channel is used for the hard shaft to penetrate through so that the impeller is driven to rotate by the driving shaft; the impeller comprises at least two impeller monomers, wherein each impeller monomer comprises a hub monomer and blades formed on the radial outer wall of the hub monomer, and the hub monomers are enclosed together to define the mounting channel;

the magnetic attraction structure is used for magnetically attracting and fixing every two adjacent impeller monomers.

2. The impeller assembly of claim 1 wherein said magnetic attraction structure is mounted between each two adjacent said hub units.

3. The impeller assembly of claim 1 wherein the magnetic attraction structure is provided in at least two, and each magnetic attraction structure is provided on each hub unit in a one-to-one correspondence.

4. The impeller assembly of claim 3 wherein said magnetic attraction structures on each adjacent two of said hub units are magnets of opposite polarity.

5. An impeller assembly according to claim 3, wherein one of said magnetically attractable structures on each adjacent two of said hub units is a magnet, and wherein the other of said magnetically attractable structures is made of a material comprising iron metal, cobalt metal and/or nickel metal.

6. The impeller assembly of claim 3 wherein at least one of said magnetically attractable structures on each adjacent two of said hub units is a magnet and said hard shaft is made of a material comprising iron metal, cobalt metal and/or nickel metal.

7. The impeller assembly of claim 3 wherein the magnetic attraction structure is adapted to extend in an arc shape corresponding to the shape of the hub unit.

8. The impeller assembly of any one of claims 3 to 7, wherein the hub unit wraps around the entire outer surface of the corresponding magnetic attraction structure.

9. A pump head, comprising:

a pump housing for connection with a distal end of a catheter in the interventional catheter device;

an impeller assembly according to any one of claims 1 to 8.

10. An interventional catheter device, comprising:

a conduit;

a motor;

the pump head of claim 9, being deliverable to a desired location of a subject's heart and pumping blood through the catheter, the impeller assembly being driven by the motor.