CN115177323A

CN115177323A - Thrombus taking device and thrombus taking system

Info

Publication number: CN115177323A
Application number: CN202211098590.7A
Authority: CN
Inventors: 梁柱; 李爽; 郭力友; 夏洁
Original assignee: Suzhou Zhongtian Medical Device Technology Co ltd
Current assignee: Suzhou Zhongtian Medical Device Technology Co ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2022-10-14

Abstract

The invention relates to the technical field of medical instruments, and particularly discloses a thrombus taking device and a thrombus taking system. The device can be placed in a blood vessel and comprises a catheter and a thrombus removal bracket; the catheter extends along the length of the blood vessel; the thrombus taking support can be collected in a catheter and comprises a connecting assembly, an outer support and an inner support, one end of the connecting assembly is connected with a conveying guide wire extending along the length direction of the catheter, the other end of the connecting assembly is connected with the outer support and the inner support, the outer support and the inner support are both tubular nets, the inner support comprises a first support and a second support which are connected, the aperture of the second support is larger than that of the first support, the outer support is sleeved on the first support, and the first support and the outer support are fixedly connected to the connecting assembly. The device is through setting up double-deck supporting structure's mode for get and tie the support and can establish the blood flow passageway fast when the expansion, win the time for in time dredging pathological change blood vessel, moreover, double-deck support still possesses radial holding power reinforce, the advantage that the support adherence performance is good.

Description

Bolt taking device and bolt taking system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a thrombus taking device and a thrombus taking system.

Background

Vascular embolism is a vascular disease that can cause tissue ischemia, including arterial thromboembolic diseases and venous thromboembolic diseases. Arterial thrombotic diseases include stroke and myocardial infarction. Venous thromboembolism includes pulmonary thromboembolism and deep vein thrombosis of the lower extremities. In addition to conventional thrombolytic therapy, endoluminal mechanical embolectomy is gaining increasing preference among patients and physicians due to its high rate of vascular recanalization and relatively small trauma.

As shown in FIG. 1, mechanical thrombectomy is performed by creating a passage through the puncture of a blood vessel 910', delivering an embolectomy device through the blood vessel 910' to the site of the occlusion of the blood vessel 910', and removing the thrombus 920' with the embolectomy device to recanalize the blood vessel 910 '. The thrombus removal device comprises a catheter 100' and a thrombus removal support 300', wherein the catheter 100' is provided with a developing ring 110' for marking the position of the catheter 100', one end of the thrombus removal support 300' is fixedly connected with a delivery guide wire 200', and the thrombus removal support 300' comprises a support main body 320' for capturing thrombus 920' and a connecting component 310' for connecting the delivery guide wire 200' and the support main body 320 '.

However, the existing embolectomy devices also have the following problems:

1) The wall sticking capability of the thrombus removal support 300' is poor, and the compliance performance cannot meet the thrombus removal requirement;

2) For the embolism with larger and harder thrombus 920', the thrombus removal effect of the thrombus removal device is poor;

3) The fixing effect on the small-size thrombus 920 'is poor, and the thrombus 920' is easy to escape;

4) When the thrombus 920 'is large and hard, the thrombus taking support 300' cannot rapidly open the thrombus to form a blood flow channel, so that the blood recanalization time is delayed, and the risk is increased for a patient.

Disclosure of Invention

The invention aims to provide a thrombus taking device and a thrombus taking system, so as to increase the radial expansion force of a support, improve the embedding effect on thrombus, reduce the escape risk of thrombus and accelerate the reconstruction speed of a blood flow channel.

In order to achieve the purpose, the invention adopts the following technical scheme:

the thrombus taking device can be arranged in a blood vessel and comprises a catheter and a thrombus taking bracket; the catheter extends along the length of the blood vessel; the thrombus taking support can be contracted in the catheter, and comprises a connecting assembly, an outer support and an inner support, wherein one end of the connecting assembly is connected with an edge of a conveying guide wire extending in the length direction of the catheter, the other end of the connecting assembly is connected with the outer support and the inner support, the outer support and the inner support are both tubular nets, the inner support comprises a first support and a second support which are connected, the aperture of the second support is larger than that of the first support, the outer support is sleeved on the first support, and the first support and the outer support are fixedly connected with the connecting assembly.

As a preferable technical scheme of the thrombus removal device, the inner-layer stent further comprises a third stent, the first stent and the second stent are connected through the third stent, and the aperture of the third stent is gradually increased along the direction far away from the delivery guide wire.

As a preferred technical scheme of the thrombus removal device, the outer-layer support and the inner-layer support form parallelogram grids which are spirally distributed along the length direction of the delivery guide wire, and the thrombus removal support can rotate along the length direction of the delivery guide wire.

As the preferred technical scheme of the thrombus removal device, the parallelogram grid is provided with a long edge and a short edge, the ratio of the length of the long edge to the length of the short edge is greater than a proportional threshold, and the included angle between the long edge and the short edge is within an angle threshold range.

As the preferred technical scheme of the bolt taking device, one end of the connecting component, which is close to the conveying guide wire, is provided with a connecting seat, one end of the conveying guide wire, which is close to the connecting component, is provided with a connector main body, the connecting seat forms a positioning groove, the connector main body is arranged in the positioning groove, and the surface of the connector main body is matched with the groove wall of the positioning groove.

As a preferable technical scheme of the bolt taking device, the joint main body is spherical or cylindrical.

The thrombus removing device comprises an outer layer bracket, an inner layer bracket and a plurality of developing belts, wherein the outer layer bracket and/or the inner layer bracket are wound with the developing belts, and the plurality of developing belts are uniformly distributed on the outer layer bracket and/or the inner layer bracket at intervals.

As a preferable technical scheme of the embolectomy device, the delivery guide wire comprises a first straight section, a first transition section, a second straight section, a second transition section and a third straight section which are connected end to end in the direction far away from the embolectomy support, the cross-sectional areas of the first straight section, the second straight section and the third straight section are sequentially increased, and the cross-sectional areas of the first transition section and the second transition section are gradually increased along the direction far away from the embolectomy support.

As the preferred technical scheme who gets the bolt device, it is close to carry the seal wire the one end rigid coupling of coupling assembling has the seal wire pipe, coupling assembling is close to the one end of carrying the seal wire is equipped with the spacing ring, the spacing ring cover is located the seal wire pipe.

The thrombus taking system comprises a catheter seat, a Ruhr connector and the thrombus taking device, wherein the catheter seat is sleeved at one end of the catheter far away from the thrombus taking support, and the Ruhr connector is fixedly connected at one end of the catheter seat far away from the catheter.

The invention has the beneficial effects that:

the thrombus taking device utilizes the design that the thrombus taking support can be contracted in the catheter, so that the thrombus taking support can be smoothly conveyed to an affected part by the catheter and then released, and the thrombus taking support which finishes thrombus taking operation can be recovered into the catheter. By means of the cooperation of the conveying guide wire and the thrombus taking support, an operator drives the thrombus taking support to complete corresponding actions by driving the conveying guide wire, so that the thrombus taking support can be smoothly released and recovered, the difficulty of thrombus taking operation is reduced, and the efficiency of thrombus taking operation is improved. Through the double-deck supporting structure who sets up outer support and inlayer support, increased and got the dynamics of tying the radial expansion of support, promoted the embedding effect to the thrombus, reduced the risk that broken thrombus escaped for get to tie the support and can establish blood flow passageway fast when the expansion, win the time for in time dredging pathological change blood vessel. Simultaneously, the design of first support and second support makes the inlayer support possess the structure that the near-end was drawn in, the distal end is expanded, and the radial holding power of this structure is strong, and adherence performance is good and get the bolt effect excellent.

Drawings

FIG. 1 is a schematic structural view of a prior art thrombectomy device and a blood vessel;

FIG. 2 is a first schematic structural diagram of a thrombus removal device according to an embodiment of the present invention;

FIG. 3 is a second schematic structural diagram of a thrombus removal device provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an embolectomy device and a blood vessel provided by an embodiment of the invention;

FIG. 5 is a first schematic structural view of an embolectomy stent and a delivery guidewire provided by an embodiment of the invention;

FIG. 6 is a second schematic structural view of an thrombectomy stent and a delivery guidewire according to the present invention;

FIG. 7 is a third schematic structural view of an thrombectomy stent and a delivery guidewire according to the present invention;

FIG. 8 is a schematic structural view of a delivery guidewire provided in accordance with an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of an inner stent provided by an embodiment of the invention;

FIG. 10 is a first schematic structural diagram of a thrombus removal system according to an embodiment of the present invention;

fig. 11 is a second schematic structural diagram of a thrombus removal system provided by an embodiment of the present invention.

In FIG. 1:

100', a conduit; 110', a developing ring; 200', a delivery guide wire; 300', a thrombus taking support; 310', a connection assembly; 320', a holder body; 910', blood vessels; 920' and thrombus.

In fig. 2-11:

100. a conduit; 110. a developing ring; 200. delivering a guide wire; 201. a first ball joint; 202. a second ball joint; 203. a cylindrical joint; 210. a first straight section; 220. a first transition section; 230. a second straight section; 240. a second transition section; 250. a third straight section; 300. a thrombus taking support; 310. a connection assembly; 311. a ball recess; 312. a third spherical joint; 313. a limiting buckle head; 320. an outer layer bracket; 321. an outer layer developing belt; 330. an inner layer support; 340. a connecting lantern ring; 350. embedding a buckling column; 360. a limiting ring; 370. sleeving a pipe; 380. a wire guide tube; 390. a delivery head; 400. a catheter hub; 500. a luer fitting; 510. a communication valve; 910. a blood vessel; 920. thrombosis.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 2-4, the present embodiment provides an embolectomy device, which can be placed in a blood vessel 910, and comprises a catheter 100 and an embolectomy stent 300; catheter 100 extends along the length of blood vessel 910; the thrombus removal support 300 can be collected in the catheter 100 and comprises a connecting assembly 310, an outer support 320 and an inner support 330, one end of the connecting assembly 310 is connected with a conveying guide wire 200 extending along the length direction of the catheter 100, the other end of the connecting assembly is connected with the outer support 320 and the inner support 330, the outer support 320 and the inner support 330 are both tubular nets, the inner support 330 comprises a first support and a second support which are connected, the aperture of the second support is larger than that of the first support, the outer support 320 is sleeved on the first support, and the first support and the outer support 320 are fixedly connected to the connecting assembly 310.

The thrombus taking device utilizes the design that the thrombus taking support 300 can be contracted in the catheter 100, so that the thrombus taking support 300 can be smoothly conveyed to an affected part by the catheter 100 and then released, and the thrombus taking support 300 which finishes thrombus taking operation can be recovered into the catheter 100. By means of the matching of the delivery guide wire 200 and the thrombus removal support 300, an operator drives the thrombus removal support 300 to complete corresponding actions by driving the delivery guide wire 200, so that the thrombus removal support 300 can be smoothly released and recovered, the difficulty of thrombus removal operation is reduced, and the efficiency of thrombus removal operation is improved. Through the double-deck supporting structure who sets up outer support 320 and inlayer support 330, increased the dynamics of radially expanding of support 300 of emboliaing, promoted the embedding effect to thrombus 920, reduced the risk that broken thrombus 920 escaped for support 300 of emboliaing can establish blood flow passageway fast when expanding, wins the time for the blood vessel 910 of in time dredging pathological change. Meanwhile, the design of the first and second stents makes the inner stent 330 have a structure with a folded proximal end and an unfolded distal end, the structure has strong radial supporting force, good wall-adhering performance and excellent thrombus removal effect.

When the thrombus removal stent 300 is released, the inner stent 330 plays the role of a dilator, the radial expansion capability of the outer stent 320 can be effectively enhanced, the embedding of hard thrombus 920 in the blood vessel 910 is facilitated, and the success rate of thrombus removal operation is further improved. When the thrombus removal stent 300 is withdrawn, the inner-layer stent 330 can effectively block the dissociated thrombus, so that the thrombus 920 is prevented from escaping, and secondary embolism is avoided.

Meanwhile, the tubular net structures of the outer layer stent 320 and the inner layer stent 330 are improved, so that the thrombus removal stent 300 has excellent flexibility and torque failure resistance, has good wall attachment capability in a bent blood vessel 910, and can adapt to blood vessels 910 with different shapes. The structure has the advantages of high thrombus removal efficiency, no damage to the blood vessel 910 and prevention of thrombus 920 from falling off.

Specifically, the pore size of the second scaffold is larger than the pore size of the outer scaffold 320; the outer stent 320 is concentrically sleeved with the first stent; the meshes of the inner stent 330 are denser than the meshes of the outer stent 320, and the thrombectomy stent 300 is formed by laser cutting.

The meshes of the outer layer support 320 are sparse, so that the thrombus 920 can be embedded conveniently, and the meshes of the inner layer support 330 are dense, so that the catching capacity of the escaped thrombus 920 can be improved conveniently.

Preferably, the catheter 100 is provided with a visualization ring 110 at an end thereof adjacent to the thrombectomy support 300. The placement of visualization ring 110 aids the operator in accurately positioning catheter 100 for delivery within vessel 910.

In this embodiment, the inner stent 330 further comprises a third stent, the first stent and the second stent are connected by the third stent, and the aperture of the third stent gradually increases along the direction away from the delivery guidewire 200. The structure of the inner layer support 330 is optimized by the third support, the production difficulty of the inner layer support 330 is reduced, the thrombus removal capability of the inner layer support 330 is improved, and the risk of escape of the thrombus 920 is further reduced.

Preferably, the outer stent 320 and the inner stent 330 each form a parallelogram grid that is helically distributed around the length of the delivery guidewire 200, and the thrombectomy stent 300 is rotatable around the length of the delivery guidewire 200.

By means of the design of the parallelogram grids on the outer-layer stent 320 and the inner-layer stent 330, the blockage of the blood vessel 910 to the outer-layer stent 320 and the inner-layer stent 330 can be avoided in a rotating mode in the process of withdrawing the embolectomy stent 300, so that the embolectomy stent 300 rotates around the axis of the delivery guide wire 200, the capturing capability of the thrombus 920 is enhanced, the condition that the thrombus 920 falls off in the withdrawing process of the embolectomy stent 300 is avoided, and the embolectomy operation effect is improved.

When the thrombus taking support 300 is withdrawn into the catheter 100 and meets resistance, the thrombus taking support 300 can also generate self-adaptive rotation, has good compliance performance, automatically avoids the resistance, can realize multidirectional cutting of the thrombus 920, further enhances the thrombus taking capability of the thrombus taking device, and reduces the damage to the blood vessel 910.

Furthermore, the parallelogram grid is provided with long sides and short sides, the ratio of the length of the long sides to the length of the short sides is larger than a proportional threshold, and the included angle between the long sides and the short sides is within the range of an angle threshold. Because the unequal design of the length of mesh long limit and minor face, the mesh that adopts above-mentioned structure is when embedding foreign matter such as thrombus 920, and the long limit is different with the contact condition of thrombus 920 with the minor face, when withdrawing the action to taking the embolia support 300, and the long limit is different with the accumulated resistance that the minor face received, because the atress of long limit and minor face is uneven, can lead to taking the embolus support 300 can take place autogyration at the in-process that withdraws.

The design limits the size ratio of the long side to the short side and the range of the included angle, and the limitation of the parallelogram grids is completed, so that the self-adaptive capacity of the rotation of the bolt taking support 300 is ensured, and the rotation of the bolt taking support 300 is accurately and effectively completed.

In the embodiment, all the connecting lines of the long sides and the short sides are spiral lines, and the spiral lines of the long sides and the short sides are opposite in direction; diamond grids are arranged at the edges of the outer layer support 320 and the inner layer support 330, and the metal wire grids forming the grids are gradually gathered to form connecting rods and are connected with the connecting component 310. The diamond mesh provides uniform radial support to the wire. By adding the connecting rod, the transmission of the twisting control force of the delivery guide wire 200 can be enhanced, and the delivery and retraction operation of the embolectomy support 300 can be facilitated.

In this embodiment, the proportional threshold is 1.1, and the angular threshold ranges from 60 ° to 120 °. Preferably, the ratio of the length of the long side to the length of the short side is within 1.5-3. Specifically, the ratio of the length of the long side to the length of the short side is 2.

In another embodiment, the outer stent 320 and the inner stent 330 are formed by two different mesh sizes alternately, the mesh sizes are larger to facilitate the insertion of the thrombus 920, and the mesh wires are denser and provide stronger radial support.

In this embodiment, the end of the connecting component 310 close to the conveying guide wire 200 is provided with a connecting seat, the end of the conveying guide wire 200 close to the connecting component 310 is provided with a connector main body, the connecting seat forms a positioning groove, the connector main body is installed in the positioning groove, and the surface of the connector main body is matched with the groove wall of the positioning groove. The design that the positioning groove is matched with the joint main body ensures that the embolectomy support 300 can rotate around the length direction of the delivery guide wire 200, and the structure has the advantages of small occupied space, convenient delivery and firm connection.

Further, the joint body is spherical or cylindrical. The spherical or cylindrical joint body is beneficial to the rotation of the thrombus removal support 300 and can ensure the stable connection of the thrombus removal support 300 and the delivery guide wire 200.

In this embodiment, still cup jointed the connection lantern ring 340 on the connecting seat, the design of cup jointing of connection lantern ring 340 has realized the restraint to the connecting seat, has reduced the risk that has the clearance between the cell wall of the surface of connecting the main part and positioning groove, further guarantee positioning groove and the stability of being connected of connecting the main part.

Preferably, the connection collar 340 is made of metal. The metal material is opaque to X-rays and can play a role in developing.

In this embodiment, the gap between the connection collar 340 and the connection seat is filled with polymer adhesive. After the polymer adhesive is cured, the connection sleeve ring 340 and the connection seat can be fixedly connected.

In this embodiment, as shown in fig. 5, the connecting seat is a ball concave part 311, the main body of the joint is a first ball joint 201, the ball concave part 311 is connected with the first ball joint 201 in a matching manner, and the connecting collar 340 is sleeved on an outer side surface of the ball concave part 311.

In another embodiment, as shown in fig. 6, the connector body is the second spherical connector 202, the connecting seat includes three third spherical connectors 312 and a snap-in post 350 fixedly connected to the connecting member 310, one end of the snap-in post 350 is provided with a first snap-in groove matched with the second spherical connector 202, the other end is provided with three second snap-in grooves matched with the third spherical connectors 312, and the connecting collar 340 is sleeved on the outer side of the snap-in post 350.

In another embodiment, as shown in fig. 7, the connector body is a cylindrical connector 203, the connecting seat is a plurality of position-limiting fastening heads 313, the position-limiting fastening heads 313 are fixedly connected to the connecting component 310, the position-limiting fastening heads 313 form position-limiting cavities, the position-limiting cavities are matched with the cylindrical connector 203, and the connecting collar 340 is sleeved on the position-limiting fastening heads 313.

Preferably, as shown in fig. 9, a plurality of developing belts are wound around the outer layer supporter 320 and/or the inner layer supporter 330, and the plurality of developing belts are uniformly spaced on the outer layer supporter 320 and/or the inner layer supporter 330. Specifically, the outer layer supporter 320 is wound with an outer layer developing tape 321, and the inner layer supporter 330 is wound with an inner layer developing tape. The arrangement of the developing belt is helpful for the operator to observe the conveying state and the releasing position of the thrombus removal support 300, and the developing belt structure can be convenient for the operator to observe the expansion state of the thrombus removal support 300 after being released in the process of using the thrombus removal support 300.

Preferably, the developing belt is made of a metal wire belt, and the developing belt is integrally woven with the outer layer holder 320 and/or the inner layer holder 330 and is embedded in the connecting seat. The metal wire belt has the characteristic of being opaque to X-rays and can play a role in development.

With continued reference to fig. 2-8, in this embodiment, the delivery guidewire 200 includes a first straight segment 210, a first tapered segment 220, a second straight segment 230, a second tapered segment 240, and a third straight segment 250 that are connected end-to-end in a direction away from the embolectomy stent 300, the cross-sectional areas of the first straight segment 210, the second straight segment 230, and the third straight segment 250 increase in sequence, and the cross-sectional areas of the first tapered segment 220 and the second tapered segment 240 each increase in a direction away from the embolectomy stent 300. The working performance of the conveying guide wire 200 is improved through the structural improvement, the design that the cross section area of the third straight section 250 is large can provide large pushing force for the third straight section 250, the second straight section 230 serves as a supporting structure and can effectively conduct the pushing force to the bolt taking support 300, the first transition section 220 is a transition cone, the torsion control performance of the conveying guide wire 200 is provided, the cross section area of the first straight section 210 is small, the assembly connection of the conveying guide wire 200 and the bolt taking support 300 is facilitated, and the flexibility is good. The overall gradual change design of the delivery guidewire 200 can avoid the occurrence of bending or knotting of the delivery guidewire 200 during the delivery process, and facilitate the thrombus removal device to pass through the tortuous blood vessel 910.

As shown in fig. 10 and fig. 11, the present embodiment further provides a thrombus removal system, which includes a catheter hub 400, a luer 500 and the thrombus removal device, wherein the catheter hub 400 is sleeved on an end of the catheter 100 away from the thrombus removal holder 300, and the luer 500 is fixedly connected to an end of the catheter hub 400 away from the catheter 100. Above simple structure is reliable, helps promoting operating personnel and gets the accurate degree of tying the operation to the device of tying, has improved the success rate and the work efficiency of the operation of tying.

Specifically, the luer 500 is provided with a communication valve 510 communicating with the catheter 100. The communication valve 510 facilitates other instruments to enter the thrombus removal position, and facilitates rapid exchange operation of the operator in combination with other instruments.

In this embodiment, a guidewire tube 380 is fixedly connected to one end of the delivery guidewire 200 close to the connecting assembly 310, a limiting ring 360 is disposed at one end of the connecting assembly 310 close to the delivery guidewire 200, and the guidewire tube 380 is sleeved with the limiting ring 360. The guide wire tube 380 is provided with a guide wire accommodating space, so that the matching of the thrombus taking device and other instruments with guide wires is facilitated, and the rapid exchange operation of an operator in combination with other instruments is further facilitated.

Preferably, the sleeve 370 is sleeved on both the delivery guide wire 200 and the guide wire tube 380 to realize the fixation of the delivery guide wire 200 and the guide wire tube 380.

Specifically, the end of the guidewire tube 380 distal to the delivery guidewire 200 is provided with a delivery head 390. Delivery head 390 is a polymer tip that moves smoothly through blood vessel 910, effectively reducing damage to blood vessel 910.

As shown in fig. 2 to 4, the present embodiment further provides a thrombus removal method, which is applied to the thrombus removal system described above, and includes the following steps:

the method comprises the following steps: a blood vessel 910 access is established through a conventional radiographic guide wire and a radiographic catheter and a guiding catheter, a puncture is made at the target site and a puncture hole is formed.

Step two: the embolectomy system is advanced through the puncture into the embolic site of blood vessel 910.

Step three: the catheter 100 is withdrawn and the thrombectomy stent 300 is released, allowing the outer stent 320 and the inner stent 330 to gradually expand until they conform to the inner wall of the vessel 910.

Step four: after the thrombus 920 is sufficiently combined with the thrombus 300, the thrombus 920 positioned in the thrombus 300 and the thrombus 300 are withdrawn into the catheter 100.

Step five: the catheter 100 is withdrawn from the vessel 910 to complete the thrombectomy procedure.

The thrombus removal method successfully completes the thrombus removal operation of the thrombus removal system by firstly unfolding and then retracting the thrombus removal support 300; the planning of the above process is simple and accurate, the flexibility of positioning the embolectomy support 300 is guaranteed, and the positioning time of the embolectomy support 300 is effectively shortened, so that the embolectomy operation can be smoothly and efficiently completed. The method has the advantages of wide application range, simple and convenient operation and low workload, effectively simplifies the process of thrombus removal operation, reduces the risk of thrombus removal misoperation, improves the thrombus removal effect, reduces the risk of thrombus 920 residue, and ensures the personal safety of patients.

After deployment in the vessel 910, the thrombectomy stent 300 gradually expands as the temperature increases, binding with the thrombus 920. If one thrombus 920 cannot be completely removed by one thrombus removal operation, the thrombus removal stent 300 can be re-expanded and recovered until the thrombus 920 is completely removed.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An embolectomy device, capable of being placed within a blood vessel (910), comprising:

a catheter (100) extending along a length of the blood vessel (910);

thrombectomy support (300), can tighten up in pipe (100), including coupling assembling (310), outer support (320) and inlayer support (330), the one end of coupling assembling (310) is connected with the edge conveying guide wire (200) that the length direction of pipe (100) extends, and the other end is connected with outer support (320) with inlayer support (330), outer support (320) with inlayer support (330) are the tubular net, inlayer support (330) are including the first support and the second support that are connected, the aperture of second support is greater than the aperture of first support, outer support (320) cover is located first support, just first support with the equal rigid coupling of outer support (320) in coupling assembling (310).

2. The embolectomy device of claim 1, wherein the inner stent (330) further comprises a third stent, the first stent and the second stent being connected by the third stent, the third stent having a gradually increasing pore size in a direction away from the delivery guidewire (200).

3. The embolectomy device of claim 1, wherein the outer stent (320) and the inner stent (330) each form a parallelogram lattice that is helically distributed around the length of the delivery guidewire (200), and the embolectomy device (300) is rotatable around the length of the delivery guidewire (200).

4. The embolectomy device of claim 3, wherein the parallelogram mesh has long sides and short sides, the ratio of the length of the long sides to the length of the short sides is greater than a proportional threshold, and the included angle between the long sides and the short sides is within an angular threshold range.

5. The embolectomy device of claim 1, wherein the end of the connecting member (310) near the pushwire (200) is provided with a connecting seat, the end of the pushwire (200) near the connecting member (310) is provided with a connector body, the connecting seat forms a positioning groove, the connector body is mounted in the positioning groove, and the surface of the connector body matches with the groove wall of the positioning groove.

6. The embolectomy device of claim 5, wherein the joint body is spherical or cylindrical.

7. The embolectomy device of claim 1, wherein a plurality of developing tapes are wound on the outer layer support (320) and/or the inner layer support (330), and are uniformly distributed on the outer layer support (320) and/or the inner layer support (330) at intervals.

8. The embolectomy device of claim 1, wherein the delivery guidewire (200) comprises a first straight section (210), a first transition section (220), a second straight section (230), a second transition section (240), and a third straight section (250) that are connected end to end in a direction away from the embolectomy stent (300), the cross-sectional areas of the first straight section (210), the second straight section (230), and the third straight section (250) increase sequentially, and the cross-sectional areas of the first transition section (220) and the second transition section (240) each increase gradually in a direction away from the embolectomy stent (300).

9. The thrombus removal device according to claim 1, wherein a guide wire tube (380) is fixedly connected to one end of the delivery guide wire (200) close to the connecting assembly (310), a limiting ring (360) is arranged at one end of the connecting assembly (310) close to the delivery guide wire (200), and the guide wire tube (380) is sleeved with the limiting ring (360).

10. Thrombectomy system, comprising a catheter hub (400), a luer connector (500) and a thrombectomy device according to any one of claims 1-9, wherein the catheter hub (400) is sleeved on the end of the catheter (100) away from the thrombectomy stent (300), and the luer connector (500) is fixedly connected to the end of the catheter hub (400) away from the catheter (100).