CN116058913A

CN116058913A - Thrombus treatment device

Info

Publication number: CN116058913A
Application number: CN202211606193.6A
Authority: CN
Inventors: 冯海全; 王鑫; 冯浩翔; 苏娟; 苏应龙
Original assignee: Inner Mongolia University of Technology
Current assignee: Inner Mongolia University of Technology
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-05-05

Abstract

The present invention relates to a thrombus treatment device. The cutting assembly comprises a shaft assembly movably arranged in the catheter, a driving assembly connected to the proximal end of the shaft assembly and/or the proximal end of the catheter and a cutting part arranged at the distal end of the shaft assembly, wherein the cutting part comprises a plurality of movable blades, the cutting part has an open state and a closed state, and when the cutting part is in the open state, the distal ends of the blades are far away, so that the cutting part has a larger cutting radius; when the cutting portion is in the closed state, the distal ends of the plurality of blades are brought together such that the cutting portion has a small cutting radius, the drive assembly is operated, and the cutting portion is switchable between the open state and the closed state. According to the thrombus treatment device, the cutting radius of the thrombus treatment device can be dynamically adjusted along with the diameter of thrombus, so that on one hand, the clearance rate of the thrombus is improved, on the other hand, the cut thrombus is complete, the thrombus is convenient to recycle, and the escape rate of broken thrombus is reduced.

Description

Thrombus treatment device

Technical Field

The present invention relates to a thrombus treatment device.

Background

Thrombosis refers to the pathological process in which blood-forming components form emboli in blood vessels under certain conditions, causing partial or complete blockage of the blood vessels, and blood supply at corresponding sites is impaired. The modern medical treatment for thrombi is in the form of drug dissolution, surgical removal and mechanical thrombi removal which has occurred in recent years. Mechanical thrombus removal devices generally remove intravascular thrombus by crushing and aspiration.

The existing mechanical thrombus removing device has the problems that the thrombus removing rate is low, and crushed thrombus is easy to escape from a blood vessel at the distal end of the thrombus. Therefore, it is necessary to develop a thrombus treatment device that can improve the clearance rate of thrombus and reduce the escape rate of broken thrombus.

Disclosure of Invention

The invention aims to provide a thrombus treatment device.

In order to solve the technical problems, the invention adopts a technical scheme that:

a thrombus treatment device comprising a catheter and a cutting assembly, the cutting assembly comprising: a shaft assembly movably disposed within the catheter; a drive assembly coupled to the proximal end of the shaft assembly and/or the proximal end of the catheter for driving the shaft assembly and the catheter to rotate and/or slide relative to each other; a cutting portion disposed at a distal end of the shaft assembly, the cutting portion including a plurality of movable blades, the cutting portion having an open state and a closed state, the distal ends of the plurality of blades being spaced apart when the cutting portion is in the open state such that the cutting portion has a larger cutting radius; when the cutting portion is in a closed state, distal ends of the plurality of blades are brought together so that the cutting portion has a smaller cutting radius; the drive assembly is operable and the cutting portion is switchable between an open state and a closed state.

According to the thrombus treatment device, the cutting radius of the thrombus treatment device can be dynamically adjusted along with the diameter of thrombus, so that on one hand, the clearance rate of the thrombus is improved, on the other hand, the cut thrombus is complete, the thrombus is convenient to recycle, and the escape rate of broken thrombus is reduced.

Preferably, when the shaft assembly rotates and slides relative to the catheter, the cutting portion rotates to cut thrombus while the cutting radius is gradually increased or gradually decreased.

The invention cuts thrombus in a rotary cutting mode, is more beneficial to cutting thrombus, can adjust the cutting radius of the cutting part according to the sizes of blood vessels and thrombus in the rotary cutting process, can avoid cutting damage to the blood vessels, can also adjust the cutting radius according to the sizes of thrombus, improves the cutting efficiency, and has strong controllability and convenient operation.

Preferably, the blade is sheet-like, and the outer and inner surfaces of the blade have arcuate surfaces that project outwardly. By the arrangement of the arc-shaped surface, on one hand, the cutting part is provided with a larger thrombus accommodating space, and the cut thrombus can be accommodated in the accommodating space, so that the escape rate of the thrombus is further reduced; on the other hand, the cutting surface of the blade with the outwards protruding arc surface is also an arc surface, so that the blade can be prevented from cutting a blood vessel, and a certain protection effect is achieved; in still another aspect, the beveled edge has a cutting efficiency that is higher than the perpendicular plane from the point of view of cutting efficiency.

Preferably, the blade tapers from the proximal side to the distal side thereof. The arrangement is that the distance from the distal end of the cutting part to the axial lead of the shaft component is smaller than the distance from the proximal end of the cutting part to the axial lead of the shaft component in the closed state, so that the cutting part forms an inclined surface which gradually expands from the distal end to the proximal end, and the cut thrombus is promoted to move to the catheter along the inclined surface and be discharged out of the body through the catheter, thereby being beneficial to clearing the thrombus.

According to some preferred embodiments, the cutting portion is substantially conical when the cutting portion is in a closed state, the two sides of the blade respectively abutting the sides of the blade adjacent thereto.

Preferably, the cutting portion is collapsible within the conduit when the cutting portion is in the closed state.

Preferably, the blade has 2 to 8, for example 2, 3, 4, 5, 6, 7, 8, etc.

Preferably, the cutting part further comprises a connecting piece, a connecting shaft and an elastic piece, wherein the connecting piece is fixedly connected to the shaft assembly, the connecting piece is connected with the blade in a rotating mode through the connecting shaft, the elastic piece is sleeved on the connecting shaft, one end of the elastic piece abuts against the connecting piece, the other end of the elastic piece abuts against the blade, and the elastic piece is applied to the blade to enable the blade to rotate around the axis of the connecting shaft and enable the cutting part to tend to be in an open state.

Further preferably, the distal end side of the connecting member is provided with a plurality of grooves, the plurality of grooves are in one-to-one correspondence with the blades, the proximal ends of the blades are provided with convex parts matched with the grooves, and the connecting shaft penetrates through the convex parts to be connected to the grooves.

According to some preferred embodiments, the connector is substantially annular, and the connector has an outer diameter that is smaller than an inner diameter of the catheter to enable the connector to be received within the catheter.

According to some preferred embodiments, the elastic member is a torsion spring, and has a first torsion arm, a second torsion arm and a main body, wherein the main body is sleeved on the connecting shaft, and the first torsion arm and the second torsion arm are respectively abutted against the connecting member and the blade.

Preferably, the driving assembly comprises a first driving part for driving the shaft assembly to rotate and a second driving part for driving the catheter to slide, the first driving part comprises a first motor, a first gear and a second gear which are respectively arranged on a rotating shaft of the first motor and the shaft assembly, the first gear is meshed with the second gear, the first gear responds to the first motor and generates meshing force for pushing the second gear to rotate on the second gear, and the shaft assembly is driven by the second gear to rotate around the axis line of the shaft assembly; the second driving piece comprises a second motor and a limiting wheel arranged on a rotating shaft of the second motor, a circle of limiting groove is formed in the peripheral side of the limiting wheel, the limiting groove obliquely extends, a limiting boss matched with the limiting groove is arranged on the outer side wall of the guide pipe, the limiting boss is positioned in the limiting groove and is used for operating the second motor, the limiting wheel rotates, and the limiting boss slides in the limiting groove and pushes the guide pipe to reciprocate along the axial lead direction of the shaft assembly.

Preferably, the shaft assembly comprises a shaft core and a helical blade arranged on the outer circumferential side of the shaft core, the outer side wall of the helical blade with at least more than one circle is fixedly connected with the connecting piece of the cutting part, and the helical blade is not contacted with the inner side wall of the guide pipe. The spiral blade is arranged, so that negative pressure can be generated to suck the cut thrombus outwards when the spiral blade rotates, and the cut thrombus can be transported outwards according to the Archimedes spiral principle. In addition, through making at least a week helical blade and cutting portion connection, promoted the stability that cutting portion and helical blade connect, avoided the eccentric condition of cutting portion to take place.

Preferably, the thrombus treatment device further comprises a plugging assembly and a handle, wherein the plugging assembly comprises a balloon catheter and a balloon, the balloon catheter is positioned in a hollow cavity channel of the shaft assembly, two ends of the balloon catheter respectively extend outwards, the balloon catheter is provided with a guide wire cavity for a guide wire to pass through, the balloon is arranged at the distal end of the balloon catheter, filling medium is introduced into the balloon catheter, and the balloon can be outwards expanded; the handle is disposed at a proximal end of the shaft assembly, the handle having a passageway for the balloon catheter to pass through.

Preferably, the thrombus treatment device further comprises a suction pump communicated with the proximal end of the catheter, the inlet side of the suction pump is communicated with the catheter through a suction tube, a three-way valve is connected to the suction tube, and a thrombus recovery bag is connected to the outlet side of the suction pump. The chopped thrombus is reliably sucked by the suction pump and conveyed by the spiral blade to the proximal thrombus recovery bag.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

Drawings

FIG. 1 is a schematic view showing the structure of a thrombus treatment device of the present invention;

FIG. 2 is a schematic view of a cutting portion of the present invention in an open state;

FIG. 3 is a schematic view showing a structure of a cutting portion of the present invention when the cutting portion is changed from an open state to a closed state;

FIG. 4 is a schematic view of a cutting portion of the present invention in a closed configuration;

FIG. 5 is a schematic view of a cutting portion according to the present invention;

FIG. 6 is an enlarged view at FIG. 5A;

FIG. 7 is a top view of a cutting portion of the present invention;

FIG. 8 is a schematic view of a cutting assembly (drive assembly not shown) according to the present invention;

FIG. 9 is an exploded view of a cutting assembly (drive assembly not shown) of the present invention;

FIG. 10 is a schematic view of a cutting assembly (drive assembly and shaft assembly not shown) according to the present invention;

FIG. 11 is a schematic view showing the structure of a thrombus treatment device of the present invention for cutting out a first cycle;

FIG. 12 is a schematic view showing the structure of a thrombus treatment device of the present invention for cutting out a second cycle;

FIG. 13 is a schematic view of another cutting portion according to the present invention;

FIG. 14 is a top view of another cutting portion of the present invention;

FIG. 15 is a schematic view of a cutting portion according to still another embodiment of the present invention;

FIG. 16 is a top view of yet another cutting portion of the present invention;

FIG. 17 is a schematic view of a cutting portion according to still another embodiment of the present invention;

FIG. 18 is a top view of yet another cutting portion of the present invention;

FIG. 19 is a schematic view of a connector according to the present invention;

in the figure: 1. a conduit; 11. a limit boss;

21. a shaft core; 211. a helical blade; 22. a first driving member; 221. a first motor; 222. a first gear; 223. a second gear; 23. a second driving member; 231. a second motor; 232. a limiting wheel; 2321. a limit groove; 24. a cutting portion; 241. a blade; 2411. a convex portion; 242. a connecting piece; 2421. a groove; 243. a torsion spring; 2431. a first torsion arm; 2432. the second torsion arm; 2433. a main body;

31. a balloon; 32. a balloon catheter;

4. a handle;

5. a suction pump;

6. a three-way valve;

7. a thrombus recovery bag;

8. a guide wire; 81. a developing section;

9. thrombus;

r, cutting radius.

Detailed Description

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in numerous different ways without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

In describing embodiments of the present invention, it should be understood that the terms "proximal", "distal", and the like refer to an orientation or positional relationship based on that shown in fig. 1, for example, where the end remote from the operator is the distal end and the end near the operator is the proximal end. It is merely for convenience in describing and simplifying the description of embodiments of the present invention and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.

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 description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In embodiments of the invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different implementations, or examples, for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

Example 1

A thrombus treatment device comprising a catheter 1 and a cutting assembly.

As shown in fig. 1, the cutting assembly includes a shaft assembly movably disposed within the catheter 1, a drive assembly coupled to the proximal end of the shaft assembly and/or catheter 1 for driving the shaft assembly and catheter 1 relative to one another in rotation and/or sliding, and a cutting portion 24 disposed at the distal end of the shaft assembly.

As shown in fig. 2 to 4, the cutting portion 24 includes a plurality of movable blades 241, the cutting portion 24 having an open state and a closed state, when the cutting portion 24 is in the open state, distal ends of the plurality of blades 241 are spaced apart such that the cutting portion 24 has a larger cutting radius R; when the cutting portion 24 is in the closed state, the distal ends of the plurality of blades 241 are brought together such that the cutting portion 24 has a smaller cutting radius R; the drive assembly is operated and the cutting portion 24 is switchable between an open state and a closed state. According to the present invention, the cutting radius R refers to the distance of the distal end of the blade 241 from the axis of the shaft assembly. The dynamic adjustment of the cutting radius R can be realized by operating the driving component, so that when the thrombus 9 is cut, on one hand, medical staff can adjust the cutting radius R according to the diameter of the thrombus 9 at the lesion position and the inner wall of the blood vessel, the application range is wider, and the clearing effect of the thrombus 9 is better; on the other hand, by controlling the opening and closing of the cutting portion 24, the cutting portion 24 can grasp the thrombus 9 while cutting, so that the escape rate of the thrombus 9 is reduced, and the clearance rate of the thrombus 9 is further increased.

As shown in fig. 5 and 6, the cutting portion 24 further includes a connecting piece 242, a connecting shaft (not shown), and an elastic piece. The connecting piece 242 is fixedly connected to the distal end portion of the shaft assembly, the connecting piece 242 is rotatably connected to the blade 241 through the connecting shaft, the elastic piece is sleeved on the connecting shaft, one end of the elastic piece abuts against the connecting piece 242, the other end of the elastic piece abuts against the blade 241, and the elastic force applied to the blade 241 by the elastic piece drives the blade 241 to rotate around the axial line of the connecting shaft and enables the cutting portion 24 to be in an open state.

Specifically, as shown in fig. 19, the connector 242 is substantially annular and has an outer diameter smaller than the inner diameter of the catheter 1, and the connector 242, the shaft assembly and the coaxial assembly of the catheter 1 are disposed such that the connector 242 can be accommodated in the catheter 1. The distal end side of the connecting piece 242 is provided with a plurality of grooves 2421, and the plurality of grooves 2421 are in one-to-one correspondence with the blades 241. The proximal end of the blade 241 has two protrusions 2411 engaged with the grooves 2421, the protrusions 2411 are two spaced apart, the elastic member is disposed between the two protrusions 2411, and the connecting shaft sequentially passes through one of the protrusions 2411, the elastic member and the other protrusion 2411 and is connected to the grooves 2421, so that the blade 241 is rotatably connected to the connecting member 242, and the axis of the connecting shaft is perpendicular to the axis of the connecting member 242.

Preferably, the elastic member is a torsion spring 243 having a first torsion arm 2431, a second torsion arm 2432, and a main body 2433, the main body 2433 is sleeved on the connecting shaft between the two protrusions 2411, and the first torsion arm 2431 and the second torsion arm 2432 are respectively abutted against the connecting member 242 and the blade 241.

As shown in fig. 7 to 9, the blade 241 has a sheet shape, and an outer surface and an inner surface thereof have arc surfaces protruding outward. The blade 241 tapers from its proximal side to its distal side. When the catheter 1 slides relative to the shaft assembly, the pushing force of the catheter 1 on the blade 241 forces the blade 241 against the elastic force of the elastic member, thereby rotating the blade 241 relative to the link 242, and as the blade 241 rotates, the cutting radius R of the cutting portion 24 gradually decreases until the cutting portion 24 is shifted to the closed state. When the cutting portion 24 is in the closed state, both sides of the blade 241 are respectively fitted to the side portions of the adjacent blade 241, so that the cutting portion 24 is tapered. The conical cutting part 24 is more beneficial to grabbing the thrombus 9, has smaller volume and is convenient for the cutting part 24 to be folded in the catheter 1.

The number of blades 241 may be designed according to practical situations. Preferably, the number of blades 241 is 2 to 8. In this embodiment, the number of blades 241 is 3. In other embodiments, blades 241 may also be 4 (as shown in fig. 13 and 14), 5 (as shown in fig. 15 and 16), 6 (as shown in fig. 17 and 18), or the like.

The shaft assembly includes a shaft core 21 and a spiral blade 211 provided on the outer circumferential side of the shaft core 21, and a spiral center line of the spiral blade 211 is an axial line of the shaft core 21. The length of the helical blade 211 in the axial direction thereof is substantially equal to the length of the catheter 1 in the axial direction thereof, that is, the helical blade 211 is provided on the outer peripheral side of the shaft core 21 located inside the catheter 1, and the helical blade 211 is not provided on the outer peripheral side of the shaft core 21 located outside the catheter 1. When the shaft assembly rotates, on one hand, the spiral blade 211 rotates to generate negative pressure to suck the cut thrombus 9 outwards; on the other hand, a spiral channel is formed between the spiral blade 211 and the shaft assembly, and the cut thrombus 9 can be transported outwards along the spiral channel according to the archimedes spiral principle.

Further, as shown in fig. 9 and 10, the spiral blade 211 has a certain thickness, and the outer side wall of at least one turn of the spiral blade 211 is fixedly connected to the cutting portion 24 and the inner side wall of the connector 242. By the arrangement, the stability of the connection of the connecting piece 242 and the helical blade 211 is improved, and the eccentric condition of the connecting piece 242 is avoided. In addition, the cut thrombus 9 can be discharged through the spiral passage formed by the shaft core 21, the connector 242 and the spiral blade 211 and the spiral passage formed by the spiral blade 211, the shaft core 21 and the catheter 1. Preferably, the helical blades 211 are in close proximity to but not in contact with the inner side wall of the catheter 1. The inside of the shaft core 21 is provided with a hollow cavity passage which is penetrated.

As shown in fig. 1, the drive assembly comprises a first drive member 22 for driving the rotation of the shaft assembly and a second drive member 23 for driving the sliding of the catheter 1.

The first driving member 22 includes a first motor 221, a first gear 222 and a second gear 223 respectively disposed on a rotation shaft of the first motor 221 and on the shaft assembly, the first gear 222 and the second gear 223 are engaged, the first gear 222 responds to the first motor 221 and generates an engagement force for the second gear 223 to push the second gear 223 to rotate, so that the shaft assembly rotates around an axis line thereof under the driving of the second gear 223, thereby realizing the rotation cutting of the cutting portion 24. In the present embodiment, the second gear 223 is provided on the shaft core 21.

The second driving piece 23 comprises a second motor 231 and a limiting wheel 232 arranged on the rotating shaft of the second motor 231, a circle of limiting groove 2321 is formed in the outer peripheral side of the limiting wheel 232, the limiting groove 2321 extends obliquely, a limiting boss 11 matched with the limiting groove 2321 is arranged on the outer side wall of the guide tube 1, and the limiting boss 11 is located in the limiting groove 2321. The second motor 231 is operated, the limiting wheel 232 rotates, so that the limiting boss 11 slides in the limiting groove 2321 and pushes the guide pipe 1 to reciprocate along the axial line direction of the shaft assembly, thereby realizing the relative sliding of the guide pipe 1 and the shaft assembly, and further realizing the dynamic adjustment of the cutting radius R of the cutting part 24 and the grabbing and cutting of the cutting part 24.

The thrombus treatment device further comprises a blocking assembly, a handle 4 and a suction assembly.

The occlusion assembly comprises a balloon catheter 32 and a balloon 31, the balloon catheter 32 is positioned in the hollow cavity of the shaft core 21 and two ends of the balloon catheter extend outwards respectively, and the balloon catheter 32 is provided with a guide wire cavity for the guide wire 8 to pass through. The front end of the guide wire 8 is provided with a developing section 81 for positioning the thrombus treatment device, and an operator can clearly see the position of the thrombus treatment device in a blood vessel under X-rays, so that thrombus can be cleared conveniently. The balloon 31 is disposed at the distal end of the balloon catheter 32, and a filling medium is introduced into the balloon catheter 32, and the balloon 31 can be expanded outwards and contacted with the blood vessel, so that the distal end of the lesion area is isolated, and the cut thrombus is prevented from flowing into the blood circulation system from the distal end of the lesion area, and other complications are caused.

A handle 4 is provided at the proximal end of the shaft core 21, the handle 4 having a passage through which the balloon catheter 32 passes.

The suction assembly comprises a suction pump 5 communicated with the proximal end of the catheter 1, the inlet side of the suction pump 5 is communicated with the catheter 1 through a suction tube, a three-way valve 6 is connected to the suction tube, and a thrombus 9 recovery bag 7 is connected to the outlet side of the suction pump 5 for recovering thrombus 9.

Working principle:

the medical staff inserts the thrombus treatment device along the guide wire 8 to the lesion site with thrombus 9 in the blood vessel, and fills the balloon 31 with filling medium through the balloon catheter 32, so that the balloon 31 is expanded at the distal end of the thrombus 9. In the expanded state of the balloon 31, the outer surface thereof is closely attached to the inner wall of the blood vessel, so that the balloon 31 isolates the distal end of the lesion region.

The medical staff adjusts the cutting radius R of the cutting portion 24 according to the size of the diameter of the thrombus 9 at the lesion site and the size of the inner wall of the blood vessel, and the adjustment of the cutting radius R can be achieved by moving the catheter 1. Starting the first motor 221 and the second motor 231 after the adjustment is finished, and along with the starting of the first motor 221, rotating the blade 241 to cut thrombus under the action of the first gear 222 and the second gear 223; the guide pipe 1 is driven by the second motor 231 to reciprocate along the axial direction under the action of the limiting wheel 232, so that the opening and closing functions of the blade 241 are realized, and the grabbing and cutting functions of the cutting part 24 are realized.

The cutting of the thrombus 9 is performed in a periodic manner, and the opening and closing of the cutting portion 24 is defined as the completion of one cycle (as shown in fig. 11), and the operation of one cutting cycle can cut out one thrombus 9. The thrombus 9 cut after completion of one cycle is transported to the outside of the body along with the screw blade 211 by the negative pressure generated by the rotation of the screw blade 211. Then, a second cycle of cutting operation is performed (as shown in fig. 12) with respect to one cutting radius R of the cutting portion 24 according to the diameter of the thrombus 9 at the next position until the thrombus 9 is completely removed. If during operation the catheter 1 is found to be prone to clogging, the suction pump 5 may be started and the auxiliary helical blade 211 removes the cut thrombus 9 from the body.

The thrombus treatment device of the present invention has at least the following advantages:

(1) The cutting radius of the thrombus treatment device can be changed in real time along with the diameter of thrombus, so that the clearance rate of the thrombus is improved; and through the real-time adjustment of the cutting radius, the cut thrombus is in a relatively finished sheet shape, so that the thrombus is convenient to recover, and the escape rate of broken thrombus is reduced.

(2) The thrombus treatment device can realize the opening and closing of the cutting part in the cutting process, so that the cutting part can grasp thrombus while cutting, the escape rate of thrombus is reduced, and the clearance rate of thrombus is further increased.

(3) The thrombus treatment device has simple structure and wide applicability.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims

1. A thrombus treatment device comprising a catheter and a cutting assembly, characterized in that: the cutting assembly includes:

a shaft assembly movably disposed within the catheter;

a drive assembly coupled to the proximal end of the shaft assembly and/or the proximal end of the catheter for driving the shaft assembly and the catheter to rotate and/or slide relative to each other;

a cutting portion disposed at a distal end of the shaft assembly, the cutting portion including a plurality of movable blades, the cutting portion having an open state and a closed state, the distal ends of the plurality of blades being spaced apart when the cutting portion is in the open state such that the cutting portion has a larger cutting radius; when the cutting portion is in a closed state, distal ends of the plurality of blades are brought together so that the cutting portion has a smaller cutting radius;

the drive assembly is operable and the cutting portion is switchable between an open state and a closed state.

2. The thrombus treatment device of claim 1, wherein: the cutting portion rotates to cut thrombus while the cutting radius is gradually increased or gradually decreased when the shaft assembly rotates and slides relative to the guide tube.

3. The thrombus treatment device of claim 1, wherein: the blade is sheet-shaped, and the outer surface and the inner surface of the blade are provided with arc-shaped surfaces protruding outwards; and/or the number of the groups of groups,

the blade tapers from a proximal side to a distal side thereof.

4. A thrombus treatment device as in claim 3 wherein: when the cutting portion is in a closed state, the two sides of the blade are respectively attached to the side parts of the adjacent blade, and the cutting portion is approximately conical.

5. The thrombus treatment device of claim 1, wherein: the cutting portion is collapsible within the conduit when the cutting portion is in a closed state.

6. The thrombus treatment device of claim 1, wherein: the number of the blades is 2-8.

7. The thrombus treatment device of claim 1, wherein: the cutting part further comprises a connecting piece, a connecting shaft and an elastic piece, wherein the connecting piece is fixedly connected to the shaft assembly, the connecting piece is connected with the blade in a rotating mode through the connecting shaft, the elastic piece is sleeved on the connecting shaft, one end of the elastic piece is abutted to the connecting piece, the other end of the elastic piece is abutted to the blade, and the elastic piece is applied to the blade to enable the blade to rotate around the axial lead of the connecting shaft and enable the cutting part to tend to be in an open state.

8. The thrombus treatment device of claim 7, wherein: the distal end side of connecting piece has seted up a plurality of recesses, and a plurality of the recess with the blade one-to-one, the proximal end of blade have with recess matched with convex part, the connecting axle passes the convex part is connected on the recess.

9. The thrombus treatment device of claim 7, wherein: the connecting piece is in a general ring shape, and the outer diameter of the connecting piece is smaller than the inner diameter of the guide pipe so that the connecting piece can be accommodated in the guide pipe; and/or the number of the groups of groups,

the elastic piece is a torsion spring and is provided with a first torsion arm, a second torsion arm and a main body, wherein the main body is sleeved on the connecting shaft, and the first torsion arm and the second torsion arm are respectively abutted to the connecting piece and the blade.

10. The thrombus treatment device of claim 1, wherein: the driving assembly comprises a first driving piece for driving the shaft assembly to rotate and a second driving piece for driving the catheter to slide,

the first driving piece comprises a first motor, a first gear and a second gear, the first gear and the second gear are respectively arranged on a rotating shaft of the first motor and the shaft assembly, the first gear is meshed with the second gear, the first gear responds to the first motor and generates meshing force for pushing the second gear to rotate on the second gear, and the shaft assembly is driven by the second gear to rotate around the axial lead of the shaft assembly;

the second driving piece comprises a second motor and a limiting wheel arranged on a rotating shaft of the second motor, a circle of limiting groove is formed in the peripheral side of the limiting wheel, the limiting groove obliquely extends, a limiting boss matched with the limiting groove is arranged on the outer side wall of the guide pipe, the limiting boss is positioned in the limiting groove and is used for operating the second motor, the limiting wheel rotates, and the limiting boss slides in the limiting groove and pushes the guide pipe to reciprocate along the axial lead direction of the shaft assembly.

11. The thrombus treatment device of claim 1, wherein: the shaft assembly comprises a shaft core and a spiral blade arranged on the outer circumferential side of the shaft core, the outer side wall of the spiral blade with at least more than one circle is fixedly connected with the connecting piece of the cutting part, and the spiral blade is not contacted with the inner side wall of the guide pipe.

12. The thrombus treatment device of claim 1, wherein: the thrombus treatment device also comprises a plugging assembly and a handle, wherein the plugging assembly comprises a balloon catheter and a balloon, the balloon catheter is positioned in a hollow cavity channel of the shaft assembly, two ends of the balloon catheter respectively extend outwards, the balloon catheter is provided with a guide wire cavity for a guide wire to pass through, the balloon is arranged at the distal end of the balloon catheter, filling medium is introduced into the balloon catheter, and the balloon can be outwards expanded; the handle is disposed at a proximal end of the shaft assembly, the handle having a passageway for the balloon catheter to pass through.

13. The thrombus treatment device of claim 1, wherein: the thrombus treatment device further comprises a suction pump communicated with the proximal end of the catheter, the inlet side of the suction pump is communicated with the catheter through a suction tube, a three-way valve is connected to the suction tube, and a thrombus recovery bag is connected to the outlet side of the suction pump.