CN117503267B

CN117503267B - Thrombus aspiration catheter

Info

Publication number: CN117503267B
Application number: CN202311446404.9A
Authority: CN
Inventors: 朱宽; 王震; 李志刚
Original assignee: Weiming Medical Equipment Shanghai Co ltd
Current assignee: Weiming Medical Equipment Shanghai Co ltd
Priority date: 2023-11-02
Filing date: 2023-11-02
Publication date: 2024-08-09
Anticipated expiration: 2043-11-02
Also published as: CN117503267A

Abstract

The invention provides a thrombus aspiration catheter, belonging to the technical field of interventional operation medical equipment; the device at least comprises a group of outer guide pipes and inner guide pipes, wherein the outer guide pipes and the inner guide pipes are communicated with each other, the outer guide pipes are arranged at the proximal ends of the inner guide pipes in a sealing manner, the radial dimension of the outer guide pipe cavities is larger than that of the inner guide pipe cavities, the proximal ends of the inner guide pipes extend out of the outer guide pipes and form operation ends, and the operation ends can drive the inner guide pipes to rotate in the circumferential direction and/or move in the axial direction in the outer guide pipes; solves the technical problems that in the prior art, in order to increase the suction force of the thrombus-aspiration catheter, the thrombus-aspiration catheter is poor in-place and the bending capability is reduced due to the simple increase of the lumen of the thrombus-aspiration catheter.

Description

Thrombus aspiration catheter

Technical Field

The invention belongs to the technical field of interventional operation medical equipment, and particularly relates to a thrombus aspiration catheter.

Background

Intravenous injection of rt-PA thrombolysis is the only effective treatment method of cerebral infarction proved by evidence-based medicine at present. However, intravenous injection thrombolysis has long treatment time, great damage to ischemic brain tissue, and bleeding risk, and very low recanalization rate; the recanalization rate of the basilar artery thrombolysis is only about 30%, the pathological change thrombolysis at the tail end of the carotid artery is only about 6%, and the common carotid artery thrombolysis is only about 27%. And the time window for intravenous thrombolysis is only about 4 hours. From the above, it can be seen that venous thrombolysis alone for cerebral arterial occlusion is far from sufficient, and that venous thrombolysis alone may not be sufficient to meet practical clinical needs.

Mechanical thrombus taking is to convey the thrombus taking device to a lesion position, then take out thrombus outside the body through a sheath tube, and the mechanical thrombus taking comprises the following methods: thrombectomy, which is a thorough thrombus removal method, has excessive damage to the vessel wall and is extremely easy to cause various complications; the method has the advantages that the operation difficulty of the method is high, the laser energy is too low and is ineffective, the energy is too high and damages blood vessels, and various inflammations are caused; the thrombus catching net is used for taking out the thrombus, and is simple to operate, but cannot be used in intracranial stenosed vessels due to the large volume of the thrombus catching net, and takes relatively long time.

The thrombus suction catheter is a new thrombus extraction means at present, can reduce the time from femoral artery puncture to reperfusion, shortens the overall operation time, reduces the damage to the vessel wall, and is the key of successful suction whether the thrombus suction catheter head end can reach the thrombus position in the vessel.

At present, a suction and thrombus removal mode is mainly used clinically, but the following problems are also existed, in order to improve the suction force of the inner cavity of the thrombus suction catheter, the inner cavity of the catheter is enlarged, the diameter of the thrombus suction catheter is inevitably enlarged due to the characteristic that the diameter of a blood vessel of a human body is gradually reduced from an arterial end to a tip end, once the diameter of the thrombus suction catheter is enlarged, the capability of the thrombus suction catheter to be sent to a cerebral blood vessel at a farther end is reduced, meanwhile, the bending capability of the thrombus suction catheter after the diameter is enlarged is also reduced, and the capability of the distal end of the thrombus suction catheter to pass through a tortuosity blood vessel is reduced.

Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

The invention aims to provide a thrombus suction catheter, which aims to solve the technical problems of poor in-place performance and reduced bending capacity of the thrombus suction catheter caused by simply increasing the lumen of the thrombus suction catheter in order to increase the suction force of the thrombus suction catheter in the prior art.

In order to achieve the above object, the thrombus aspiration catheter of the present invention provides the following technical scheme:

The thrombus sucking catheter at least comprises a group of outer catheters and inner catheters, wherein the lumens of the outer catheters are communicated with each other, the sealing sleeve of the outer catheters is arranged at the proximal end of the inner catheters, the radial dimension of the tube cavities of the outer catheters is larger than that of the tube cavities of the inner catheters, the proximal end of the inner catheters extends out of the outer catheters to form an operation end, and the operation end can drive the inner catheters to rotate in the circumferential direction and/or move in the axial direction in the outer catheters.

As a further optimized technical scheme, a bending control unit is arranged in a sleeved section of the outer catheter and the inner catheter and used for driving the distal end of the inner catheter to bend freely.

As a further optimized technical scheme, a stop structure which is arranged along the circumferential direction is fixedly connected on the inner side wall of the outer catheter, a sliding structure is slidably arranged on the outer side wall of the corresponding inner catheter, the sliding structure is arranged on one side, close to the proximal end of the outer catheter, of the stop structure, a traction component is arranged on the inner catheter, the traction component extends and is arranged along the axial direction of the inner catheter, one end of the traction component is fixedly connected with the distal end of the inner catheter, the other end of the traction component is fixedly connected with the sliding structure, and the stop structure, the sliding structure and the traction component jointly form the bending control unit; under the non-working state, the stop structure and the sliding structure are axially arranged at intervals, under the working state, the inner catheter is pushed to the far end, and the sliding structure and the stop structure can be mutually extruded, so that the pulling part is pulled to pull the far end of the inner catheter to bend towards one side where the sliding structure is arranged.

As a further optimized technical scheme, the inner catheter at least comprises a high polymer layer and a supporting layer, wherein the supporting layer is arranged on the inner side of the high polymer layer and comprises a reinforcing section and a bending section which are integrally and fixedly arranged, and the bending section is arranged at the far end.

As a further optimized technical scheme, the reinforcing section is of a metal pipe cutting hole-shaped structure, the bending section comprises a plurality of annular components which are arranged at intervals along the axial direction, and the annular components are fixedly connected.

As a further optimized technical scheme, the inner guide pipe is provided with a sliding groove, and the sliding structure is in sliding fit with the inner guide pipe through the sliding groove.

As a further optimized technical scheme, the inner catheter is internally provided with a mounting hole along the axial direction, and the traction component is movably arranged in the mounting hole.

As a further optimized technical scheme, the inner catheter is provided with a driving section and a sucking section along the axial extension direction, the sucking section is of a tubular structure, part of the proximal end of the sucking section stretches into the distal end of the outer catheter and is communicated with the lumen of the outer catheter, the driving section comprises at least one connecting guide wire, the proximal end of the connecting guide wire forms the operating end, and the distal end is fixedly connected with the proximal end of the sucking section.

As a further optimized technical scheme, the radial dimension of the lumen of the outer catheter is gradually reduced from the proximal end to the distal end.

As a further optimized technical scheme, the proximal end of the outer catheter is fixedly connected with a three-way valve, the inner catheter is communicated with the outer catheter through the three-way valve, and the outer catheter is connected with external suction equipment through the three-way valve;

the distal ends of the outer catheter and the inner catheter are respectively provided with a developing ring.

The beneficial effects are that: by arranging the thrombus-aspiration catheter as an inner catheter and an outer catheter, the lumen radial dimension of the outer catheter is larger than the lumen radial dimension of the inner catheter, the outer catheter is arranged at the proximal end relative to the inner catheter, and is positioned at a position where the blood vessel is close to the arterial end during the operation, and the inner catheter is used for being conveyed to the blood vessel end of the brain; the whole mode that sets up the big distal end of inner chamber near-end with thrombus aspiration catheter like this is little, has increased the lumen more rationally than the mode that directly increases the lumen of thrombus aspiration catheter among the prior art, has increased the suction capacity of the distal end of thrombus aspiration catheter, simultaneously, such setting mode has reduced the influence to the crookedness of inner catheter distal end, also can not influence the problem of the target in place of inner catheter distal end simultaneously.

The whole inner cavity of the aspiration thin catheter can be increased only by increasing the outer catheter cavity, so that the bending degree of the distal end of the inner catheter is not influenced, or the inner catheter cavity is reduced, and at the moment, if the whole inner catheter cavity is reduced to a smaller extent than the whole outer catheter cavity, the whole inner cavity of the thrombus aspiration catheter is enlarged, and thus, the aspiration capability of the catheter is increased, and the in-place property and bending property of the distal end of the inner catheter are also increased.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:

FIG. 1 is a schematic view showing the overall structure of a thrombus aspiration catheter according to an embodiment of the present invention;

FIG. 2 is a schematic view showing the overall structure of an outer catheter according to an embodiment of the present invention;

FIG. 3 is a schematic view showing the overall structure of an inner catheter according to an embodiment of the present invention;

FIG. 4 is a schematic view showing a distal end bending operation state of an inner catheter according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view taken along the direction A-A in FIG. 3;

FIG. 6 is a schematic cross-sectional view taken along the B-B direction in FIG. 3;

FIG. 7 is a schematic cross-sectional view taken along the direction C-C in FIG. 2;

FIG. 8 is a schematic cross-sectional view taken along the direction D-D in FIG. 2;

FIG. 9 is a schematic view showing a part of the structure of an inner reinforcing layer in an outer catheter according to an embodiment of the present invention;

FIG. 10 is a schematic view showing a part of the structure of an inner support layer in an inner catheter according to an embodiment of the present invention;

FIG. 11 is an enlarged schematic view of the distal portion of the inner support layer in the inner catheter according to one embodiment of the invention;

fig. 12 is an axial cross-sectional view of an inner catheter in one embodiment of the invention.

In the figure: 1. an outer conduit; 101. an outer protective layer; 102. an inner reinforcing layer; 2. an inner catheter; 201. a polymer layer; 202. a support layer; 203. a drive section; 2031. connecting a guide wire; 204. a suction section; 2021. a reinforcing section; 2022. a curved section; 2023. a mounting hole; 3. a stop structure; 4. a sliding structure; 401. a bump; 5. a pulling member; 6. a three-way valve; 7. a developing ring; 8. a chute; 9. and operating the handle.

Detailed Description

The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.

In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.

The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

Example 1 of a thrombus aspiration catheter:

the invention provides a thrombus aspiration catheter, which is characterized in that an inner cavity of the thrombus aspiration catheter is reasonably enlarged by arranging an outer catheter and an inner catheter with the inner cavities communicated with each other, so that the aspiration force of the distal end of the thrombus aspiration catheter is increased, the in-place property and the bending capability of the distal end are reduced and even optimized, the operation is more convenient, and the operation efficiency is improved.

Specifically, as shown in fig. 1, the thrombus-aspiration catheter includes a set of outer catheter 1 and inner catheter 2 with lumens communicating with each other, the proximal end of the outer catheter 1 is sealed and sleeved on the proximal end of the inner catheter 2, where it is to be noted that, in the present invention, the "proximal end" refers to the end close to the operator in the surgical procedure, and the "distal end" refers to the end far away from the operator, and the radial dimension of the lumen of the outer catheter 1 is greater than that of the lumen of the inner catheter 2, so that the overall lumen of the thrombus-aspiration catheter is made to be greater than that of the distal end, and thus, the real application scene of the human blood vessel is better met, and, in order to make the thrombus-aspiration catheter move more smoothly in the blood vessel, the radial dimension of the lumen of the outer catheter 1 can be gradually reduced from the proximal end to the distal end, i.e., the outer catheter 1 has a taper, so that the distal end of the outer catheter 1 gradually and gently transitions to connect with the inner catheter 2. The proximal end of the inner catheter 2 extends out of the outer catheter 1 and forms an operation end, the operation end can drive the inner catheter 2 to rotate circumferentially and/or move axially in the outer catheter 1, and in order to facilitate the operation of the movement of the inner catheter 2, an operation handle 9 is fixedly connected to the operation end, so that the inner catheter 2 can be driven to move relative to the outer catheter 1 conveniently by driving the operation handle 9.

In this way, the inner cavity of the thrombus-aspiration catheter can be reasonably enlarged by arranging the thrombus-aspiration catheter in such a way that the inner cavity of the outer catheter 1 and the inner catheter 2 are communicated with each other, and the specific enlarging way is two, namely, the whole inner cavity of the aspiration fine catheter can be increased only by increasing the lumen of the outer catheter 1, so that the bending of the distal end of the inner catheter 2 is not influenced. The other is to shrink the lumen of the inner catheter 2, and if the overall shrinking degree of the lumen of the inner catheter 2 is smaller than the overall enlarging degree of the lumen of the outer catheter 1, the overall inner cavity of the thrombus aspiration catheter is enlarged, so that the aspiration capability of the catheter is increased, the in-place performance and the bending performance of the distal end of the inner catheter are also increased, and the in-place performance and the bending capability of the distal end are optimized.

As shown in fig. 2, the outer catheter 1 is integrally in a tubular structure, the proximal end of the outer catheter 1 is fixedly communicated with a three-way valve 6, the three-way valve 6 is used for enabling the inner catheter 2 to be communicated with the outer catheter 1 through the three-way valve 6, and meanwhile, the outer catheter 1 is connected with an external suction device through the three-way valve 6, which is not shown in the drawing, so that thrombus at a patient position can be sucked by the suction device in the operation process conveniently. As shown in fig. 7, the outer catheter 1 comprises a two-layer structure, namely an outer protective layer 101 and an inner reinforcing layer 102, wherein the outer protective layer 101 is made of a polymer material, so that the influence on a patient is reduced; the specific structure of the inner reinforcing layer 102 is shown in fig. 9, and is a mesh-like structure formed by laser cutting using an integral metal tube.

In order to locate the advanced position of the outer catheter 1 within the blood vessel in time during the operation, the distal end of the outer catheter 1 is provided with a visualization ring 7, as shown in particular in fig. 4.

As shown in fig. 3, the inner catheter 2 is specifically provided with a driving section 203 and a suction section 204 along the axial extension direction, the suction section 204 is of a tubular structure with equal diameter, and part of the proximal end extends into the distal end of the outer catheter 1 to be in sealed communication with the lumen of the outer catheter 1, the driving section 203 comprises two connecting guide wires 2031, the two connecting guide wires 2031 are oppositely arranged at two radial ends of the inner catheter 2, the proximal end of the connecting guide wire 2031 forms the operation end, and the distal end is fixedly connected with the proximal end of the suction section 204. So that the proximal end of the inner catheter 2 has no lumen, and the communication with the lumen of the outer catheter 1 is conveniently and directly realized. At the same time, the two connecting wires 2031 are more convenient and balanced in driving the motion of the suction section 204. Particularly, when the inner catheter 2 is driven to rotate relative to the outer catheter 1, the two connecting wires 2031 can make the rotation torque larger, so that the suction section 204 can be easily rotated. In this embodiment, as shown in fig. 6, the inner catheter 2 also includes a two-layer structure, namely a polymer layer 201 and a supporting layer 202, wherein the supporting layer 202 is disposed inside the polymer layer 201 for supporting the polymer layer 201.

In order to locate the position of the inner catheter 2 in time within the vessel during surgery, the distal end of the inner catheter 2 is provided with a visualization ring 7, as shown in particular in fig. 4.

In order to facilitate control of the distal end of the inner catheter 2 to conform to the bending of the blood vessel, a bending control unit is arranged in a sleeved section of the outer catheter 1 and the inner catheter 2 and is used for driving the distal end of the inner catheter 2 to bend freely.

In this embodiment, as shown in fig. 4,5 and 8, the bending control unit includes a sliding structure 4, a pulling member 5 and an annular stop structure 3. The stop structure 3 is fixedly connected to the inner side wall arranged along the circumferential direction of the outer catheter 1, and the stop structure 3 protrudes towards the inner side of the outer catheter 1, so that the outer side wall of the inner catheter 2 with elasticity can be pressed tightly, and the sealing communication between the outer catheter 1 and the lumen of the inner catheter 2 is realized. The corresponding sliding structure 4 is slidably mounted on the outer side wall of the inner catheter 2 and protrudes towards the outer side of the inner catheter 2, and the degree to which the stop structure 3 and the sliding structure 4 protrude enables the inner catheter to mutually squeeze when moving along the axial direction. In addition, the sliding structure 4 is arranged on one side of the stop structure 3 near the proximal end of the outer catheter 1, the traction component 5 is arranged on the inner catheter 2, the traction component 5 extends along the axial direction of the inner catheter 2, one end of the traction component 5 is fixedly connected with the distal end of the inner catheter 2, and the other end of the traction component is fixedly connected with the sliding structure 4; in the non-working state, the stop structure 3 and the sliding structure 4 are axially arranged at intervals, in the working state, the inner catheter 2 is pushed to the distal end, the sliding structure 4 and the stop structure 3 can be mutually extruded, and accordingly the pulling part 5 is pulled to pull the distal end of the inner catheter 2 to bend towards one side where the sliding structure 4 is arranged. When the bending direction of the distal end of the inner catheter 2 needs to be adjusted, the inner catheter 2 is only required to be rotated by operating the handle 9.

As shown in fig. 10 and 11, the support layer 202 includes a reinforcing section 2021 and a bending section 2022 which are integrally and fixedly provided, and specifically, the support layer is also formed by machining an integral metal tube by laser cutting, and the bending section 2022 is provided at a distal end.

In this embodiment, the reinforcement section 2021 is a metal tube cutting hole structure, so that the overall strength of the inner catheter 2 is conveniently enhanced and the polymer layer 201 is supported, the bending section 2022 comprises a plurality of annular components which are axially arranged at intervals, and the annular components are fixedly connected, so that the purpose of the arrangement is to increase the flexibility of the distal end of the inner catheter 2 due to the existence of gaps between the annular components, thereby facilitating the bending of the distal end of the inner catheter 2 and increasing the operation convenience of the operation.

As shown in fig. 12, in this embodiment, a chute 8 is disposed on the support layer 202 of the inner catheter 2 along the axial extending direction, a protrusion 401 extending into the chute 8 is disposed on a side of the sliding structure 4 facing the inner catheter 2, the shape of the protrusion 401 is adapted to the chute 8, it should be noted that, in a section of the inner catheter 2 where the chute 8 is disposed, a slot hole axially disposed on a side wall of the inner catheter 2 penetrates through the inner catheter, the chute 8 is disposed on two sides of the slot hole, so that the protrusion 401 of the sliding structure 4 is mounted in the chute 8 through the slot hole, and thus the protrusion 401 can slide in the chute 8 smoothly, and thus the sliding structure 4 is in sliding fit with the inner catheter 2 through the chute 8.

In this embodiment, the support layer 202 of the inner catheter 2 is provided with an installation hole 2023 along the axial direction, the pulling member 5 is a wire, the wire is movably disposed in the installation hole 2023, and the wire is welded and fixed to the distal end of the support layer 202, so that the wire can slide along the installation hole 2023 under the driving of the sliding structure 4 when pulled by the sliding structure 4, so as to pull the distal end of the inner catheter 2.

The specific working principle of the thrombus aspiration catheter in the invention is as follows: first, the thrombus-aspiration catheter is delivered to the intravascular site near the thrombus site by the relevant delivery device, the aspiration device is not operated during delivery, the outer catheter 1 and the inner catheter 2 are not relatively moved, when the distal end of the inner catheter 2 approaches the thrombus site and further advances forward, in order to adjust the curvature of the distal end of the inner catheter 2, the inner catheter 2 can be pushed distally so that the sliding structure 4 outside the inner catheter 2 and the stopper structure 3 inside the outer catheter 1 are pressed against each other, at this time, the sliding structure 4 slides proximally along the chute 8 under the pressing of the stopper structure 3, thereby pulling the wire to slide proximally, the wire bends toward the side where the sliding structure 4 is mounted, and after the distal end of the inner catheter 2 is placed near the thrombus site, the external aspiration device is then started to aspirate the thrombus. And by arranging the thrombus-aspiration catheter as an inner catheter 2 and an outer catheter 1, the lumen radial dimension of the outer catheter 1 is larger than the lumen radial dimension of the inner catheter 2, the outer catheter 1 is arranged proximally with respect to the inner catheter 2, in a position where the blood vessel is near the arterial end during the operation, and the inner catheter 2 is for being delivered to the vascular end of the brain; the whole mode that sets up the big distal end of inner chamber near-end with thrombus aspiration catheter like this is little, has increased the lumen more rationally than the mode that directly increases the lumen of thrombus aspiration catheter among the prior art, has increased the suction capacity of the distal end of thrombus aspiration catheter, simultaneously, such setting mode has reduced the influence to the crookedness of inner catheter distal end, also can not influence the problem of the target in place of inner catheter distal end simultaneously.

In another embodiment of the thrombus aspiration catheter, the present embodiment is different from embodiment 1 in that in the present embodiment, a sliding groove is provided on the outer side of the polymer layer of the inner catheter, and the sliding structure is directly slidably fitted with the sliding groove, and at this time, the mounting hole is provided in the polymer layer.

In other embodiments of a thrombus aspiration catheter, the difference between this embodiment and embodiment 1 is that in this embodiment, a catheter with a smaller diameter may be further sleeved in the inner catheter, and at this time, a corresponding stop structure may be disposed on the inner wall of the inner catheter, and a corresponding sliding structure may be disposed on the outer wall of the catheter with a smaller diameter.

In other embodiments of a thrombus aspiration catheter, this embodiment differs from embodiment 1 in that in this embodiment, the drive section 203 may be provided with only one connecting guide wire, and in other embodiments, two or more of them may be provided.

In other embodiments of a thrombus aspiration catheter, this embodiment differs from embodiment 1 in that in this embodiment, the bent end is a coil spring-like structure.

In another embodiment of the thrombus aspiration catheter, the difference between the present embodiment and embodiment 1 is that in the present embodiment, the inner catheter may further include other structural layers not only a polymer layer and a supporting layer.

In other embodiments of a thrombus aspiration catheter, this embodiment differs from embodiment 1 in that in this embodiment, in order to ensure a sealed connection of the outer catheter with the lumen of the inner catheter, the outer catheter distal end may be provided with a few constant diameter sections to mate with the inner catheter.

It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. A thrombus aspiration catheter, which is characterized by comprising at least one group of outer catheter (1) and inner catheter (2) with lumens communicated with each other, wherein the outer catheter (1) is arranged at the proximal end of the inner catheter (2) in a sealing manner, the radial size of the lumens of the outer catheter (1) is larger than that of the lumens of the inner catheter (2), the proximal end of the inner catheter (2) extends out of the outer catheter (1) and forms an operation end, and the operation end can drive the inner catheter (2) to rotate in the circumferential direction and/or move in the axial direction in the outer catheter (1);

a bending control unit is arranged in a sleeved section of the outer catheter (1) and the inner catheter (2) and used for driving the distal end of the inner catheter (2) to bend freely;

The device comprises an outer catheter (1), a stop structure (3) which is arranged along the circumferential direction is fixedly connected to the inner side wall of the outer catheter (1), the stop structure (3) protrudes towards the inner side of the outer catheter (1), a sliding structure (4) is slidably arranged on the outer side wall of the corresponding inner catheter (2), the sliding structure (4) protrudes towards the outer side of the inner catheter (2), the sliding structure (4) is arranged on one side, close to the proximal end of the outer catheter (1), of the stop structure (3), a traction component (5) is arranged on the inner catheter (2), the traction component (5) extends along the axial direction of the inner catheter (2), one end of the traction component is fixedly connected with the distal end of the inner catheter (2), the other end of the traction component is fixedly connected with the sliding structure (4), and the stop structure (3), the sliding structure (4) and the traction component (5) jointly form the bending control unit; in the non-working state, the stop structure (3) and the sliding structure (4) are axially arranged at intervals, in the working state, the inner catheter (2) is pushed to the far end, and the sliding structure (4) and the stop structure (3) can be mutually extruded, so that the pulling component (5) is pulled to pull the far end of the inner catheter (2) to bend towards one side where the sliding structure (4) is arranged; the inner catheter (2) is provided with a chute (8), and the sliding structure (4) is in sliding fit with the inner catheter (2) through the chute (8).

2. The thrombus aspiration catheter according to claim 1, wherein said inner catheter (2) comprises at least a polymer layer (201), a support layer (202), said support layer (202) being arranged inside the polymer layer (201), said support layer (202) comprising a reinforcement section (2021) and a bending section (2022) fixedly arranged integrally, said bending section (2022) being arranged distally.

3. A thrombus-aspiration catheter according to claim 2, wherein said reinforcement section (2021) is a metal tube cut-hole structure, and said curved section (2022) comprises a plurality of axially spaced annular members, a plurality of said annular members being fixedly connected.

4. A thrombus-aspiration catheter according to claim 3, wherein said inner catheter (2) is provided with a mounting hole (2023) in the axial direction, said pulling member (5) being movably arranged in the mounting hole (2023).

5. The thrombus aspiration catheter according to any one of claims 1-4, wherein said inner catheter (2) is provided with a driving section (203) and an aspiration section (204) in an axially extending direction, said aspiration section (204) being of tubular construction and having a portion of its proximal end extending into the distal end of the outer catheter (1) and communicating with the lumen of the outer catheter (1), said driving section (203) comprising at least one connecting guidewire (2031), the proximal end of the connecting guidewire (2031) constituting said operating end, the distal end being fixedly connected to the proximal end of the aspiration section (204).

6. The thrombi aspiration catheter according to any one of claims 1-4, wherein the lumen radial dimension of said outer catheter (1) tapers from proximal to distal lumen.

7. The thrombus-aspiration catheter according to any one of claims 1-4, wherein the proximal end of the outer catheter (1) is fixedly connected with a three-way valve (6), the inner catheter (2) is in communication with the outer catheter (1) through the three-way valve (6), and the outer catheter (1) is connected with an external aspiration device through the three-way valve (6);

The distal ends of the outer catheter (1) and the inner catheter (2) are respectively provided with a developing ring (7).