CN113951976A

CN113951976A - Vascular opening device

Info

Publication number: CN113951976A
Application number: CN202111360565.7A
Authority: CN
Inventors: 刘载淳; 黄定国
Original assignee: Shanghai Tendfo Medical Technologies Co Ltd
Current assignee: Shanghai Tendfo Medical Technologies Co Ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-01-21

Abstract

The invention relates to the technical field of medical instruments and discloses a vascular opening device. It includes: a balloon catheter and a thrombus removal bracket; the balloon catheter has an inflatable and deflatable balloon; the thrombectomy support comprises: a thrombus taking basket and a thrombus cutting part; the thrombus cutting part is connected with the balloon catheter, is arranged around the outer side wall of the balloon body and can expand and contract along with the balloon body; the thrombus taking basket is an expandable and contractible bracket structure, is positioned at the far end of the balloon body and is fixedly arranged on the balloon catheter. According to the embodiment of the invention, the saccule is combined with the thrombus cutting part, so that thrombus can be cut better by utilizing the expansion effect of the saccule, the thrombus taking basket can collect the fallen thrombus and can cut and remove the thrombus for the second time.

Description

Vascular opening device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vascular opening device.

Background

Vascular disease has become the first fatal disease in our country, and vascular embolism has become the main causative factor in vascular disease. Especially, the total annual new diseases of patients suffering from cerebral arterial thrombosis, pulmonary embolism and lower limb venous embolism is over 500 ten thousand.

The interventional thrombus taking device has the advantages of small wound, short postoperative recovery time, few complications after treatment, good operation effect and the like, and can be accepted by patients better. Aiming at the problems that the existing balloon adopted by plaque can only expand stenosis and has the risk of plaque falling, the doctor in the operation needs to prevent the blockage risk of plaque falling by means of a far-end protective umbrella, and the operation is complicated; for the slow and chronic thrombus, the existing direct suction, rheological suction or mechanical thrombus extraction effect is still to be improved.

Disclosure of Invention

In view of this, an object of the embodiments of the present invention is to provide a vascular access device, which solves the problems of the conventional vascular access device that the operation is complicated and the thrombus removal effect is not good.

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

according to an aspect of the present invention, an embodiment of the present invention provides a vascular access device, including: a balloon catheter and a thrombus removal bracket; the balloon catheter has an inflatable and deflatable balloon; the thrombectomy support comprises: a thrombus taking basket and a thrombus cutting part; the thrombus cutting part is connected with the balloon catheter, is arranged around the outer side wall of the balloon body and can expand and contract along with the balloon body; the thrombus taking basket is of an expandable and contractible bracket structure, is positioned at the far end of the balloon body and is fixedly arranged on the balloon catheter.

In addition, the balloon catheter also comprises a tube body fixedly connected with the tubular inner cavity of the balloon body, and two ends of the tube body extend out of the balloon body; thrombus cutting portion includes a plurality of edges the circumference interval of utricule arranges in the cutting rod of utricule lateral wall, the near-end and the distal end of cutting rod all with body fixed connection.

In addition, the cutting rod is an S-shaped wave rod which extends along the axial direction of the capsule body in an S-shaped wave manner; the S-shaped wave-shaped rod comprises a plurality of arc-shaped rod sections, and different arc-shaped rod sections clamp the capsule body so that the S-shaped wave-shaped rod abuts against the outer wall of the capsule body.

In addition, the wave crests and the wave crests, and the wave troughs of the S-shaped rods are all arranged close to each other along the circumferential direction of the balloon, and the adjacent S-shaped rods do not interfere with each other when extending along with the inflation of the balloon.

In addition, the embolectomy basket comprises a basket cutting part and a collecting part which are smoothly connected in sequence from the near end to the far end;

the basket cutting part comprises a plurality of first V-shaped rods and a plurality of second V-shaped rods; the opening of the first V-shaped rod is larger than that of the second V-shaped rod, and the size of the first V-shaped rod is larger than that of the second V-shaped rod; the plurality of first V-shaped rods are connected in the circumferential direction and in the axial direction to form a circumferential closed-loop cylinder structure; the openings of the second V-shaped rods face to the proximal end, and the open ends of the second V-shaped rods are in butt joint with the open end of the first V-shaped rod, the opening of which faces to the distal end, to form a grid.

In addition, the collecting part comprises a plurality of bent connecting rods; the far ends of the plurality of bent connecting rods are converged and connected to the far end of the tube body; the near ends of the bending connecting rods are respectively connected to a plurality of far end connecting nodes of the net basket cutting part in parallel, and the far end connecting nodes are respectively the wave crests of the second V-shaped rods and the connecting nodes between the second V-shaped rods and the first V-shaped rods with the openings facing far ends.

In addition, the basket cutting part further comprises a plurality of fixed connecting rods; the near end of the basket cutting part is provided with the first V-shaped rod with an opening facing the near end, the far ends of the fixed connecting rods are respectively connected with the far ends of the first V-shaped rods at the near end of the basket cutting part, and the near ends of the fixed connecting rods surround and are fixedly arranged on the tube body; the plurality of fixed links form an opening of the basket cutting portion therebetween.

In addition, the bag body is cylindrical, two ends of the bag body are frustum-shaped when the bag body is expanded, and two ends of the cutting rod respectively comprise connecting sections; the connecting section comprises an extending section with the length matched with the frustum-shaped bag body part, a fixing section fixedly arranged on the outer side wall of the cylindrical bag body part and a bending part connected with the extending section and the fixing section, and the shape of the bending part is matched with the shape of the joint of the frustum-shaped bag body part and the cylindrical bag body part.

In addition, the thrombus taking bracket also comprises a ball head guide wire which is arranged at the far end of the thrombus taking basket and extends along the axial direction; the ball head guide wire comprises: the bulb and set up in the bulb with get the elasticity extending structure between the bolt support distal end.

In addition, the elastic telescopic structure is a spring structure made of memory metal or stainless steel.

According to the technical scheme, the embodiment of the invention at least has the following advantages and beneficial effects:

according to the vascular access device provided by the embodiment of the invention, the thrombus cutting part arranged around the outer side wall of the balloon body of the balloon catheter can be synchronously expanded and contracted along with the balloon body, so that thrombus can be better cut by utilizing the expansion effect of the balloon. Simultaneously, get and tie basket and locate the utricule distal end, not only can collect the thrombus that drops and prevent that it from blockking up the distal end blood vessel, through pulling the sacculus pipe withdrawal blood vessel moreover and open the device the time, can reach secondary thrombus and clear away the effect through getting the cutting of tie basket once more. The vascular opening device provided by the embodiment of the invention has the advantages of simple structure and convenience in operation, and can improve the clearing effects of acute, subacute and chronic thrombi, plaques and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is understood that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view of a vascular access device in an expanded state according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a balloon of a vascular access device according to an embodiment of the present invention in a contracted state;

FIG. 3 is a schematic structural diagram of an embolectomy stent of a vascular access device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an embolectomy stent of a vascular opening device according to a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.

Unless otherwise stated, the proximal and distal ends referred to in the present invention have the same meaning in the orientation, i.e. in the use state, the distal end is the end away from the operator, the proximal end is the end close to the operator, and the operator controls the vascular access device at the proximal end.

Referring to fig. 1-3, a vascular access device according to an embodiment of the present invention may be used with a delivery system to achieve rapid removal of blocking materials such as plaque and thrombus. The vascular opening device of the embodiment of the invention mainly comprises: a balloon catheter 1 and a thrombectomy stent 2.

The balloon catheter 1 is provided with an expandable and contractible balloon 10 and a tube body 11 fixedly connected with a tubular inner cavity of the balloon 10, two ends of the tube body 11 extend out of the balloon 10, so that the embolectomy stent 2 can be conveniently fixed on the tube body 11, and the embolectomy stent 2 is conveniently and integrally fixed on the balloon catheter 1. The balloon catheter 1 is further provided with a fluid passage (not shown) to inject fluid into the balloon 10 or withdraw fluid from the balloon 10, thereby inflating or deflating the balloon. The fluid channel of the balloon catheter 1 can be arranged in a manner known to those skilled in the art and will not be described in further detail herein.

The balloon 10 (namely, the balloon) of the balloon catheter 1 can provide strong radial expansion force when being expanded, and the radial expansion force when the balloon 10 is expanded can be concentrated on the thrombus cutting part 21 through the matching of the thrombus cutting part 21 of the thrombus taking stent 2 and the balloon 10, so that the thrombus or plaque can be cut more greatly, and the thrombus or plaque can be cut and separated more easily. And, can also control the sacculus inflation degree according to actual blood vessel size to satisfy the thrombus cutting demand of different size blood vessels more nimble. It should be noted that the balloon catheter 1 may adopt a semi-compliant or non-compliant balloon to ensure the inflation performance and safety of the balloon. The expansion pressure of the balloon is utilized to be concentrated on the cutting part (21),

specifically, the balloon 10 of the balloon catheter 1 may have a cylindrical shape, and both ends of the balloon 10 may have a frustum shape when inflated. The diameter of the barrel between the ends of the cylindrical bladder 10 may be the same. Alternatively, the diameter of the cylindrical balloon 10 may be increased from the distal end to the proximal end to accommodate changes in vessel size.

The thrombectomy support 2 comprises: an embolectomy basket and a thrombus cutting part 21, wherein the embolectomy basket and the thrombus cutting part 21 are both connected with the balloon catheter 1. The thrombus taking basket and the thrombus cutting part 21 can be fixedly connected with the tube body 11 of the balloon catheter 1, and the thrombus taking support 2 can synchronously move along with the balloon catheter 1 when the balloon catheter 1 is dragged.

The thrombus cutting part 21 is connected with the balloon catheter 1, the thrombus cutting part 21 is arranged around the outer side wall of the balloon body 10 and can expand and contract along with the balloon body 10, so that the expansion function of the balloon body 10 can act on the thrombus cutting part 21 to cut thrombus along the radial direction, and the balloon catheter 1 not only has the function of expanding stenosis, but also can cut thrombus.

The thrombus taking basket is an expandable and contractible bracket structure, is positioned at the far end of the balloon body 10 and is fixedly arranged on the balloon catheter 1. Get a thrombus basket when sacculus pipe 1 inflation cutting thrombus, can collect the plaque or the thrombus that drops to can remove along with sacculus pipe 1 when dragging sacculus pipe 1, realize the secondary cutting and collect the thrombus, thereby can improve the thrombus and clear away the effect.

The thrombus cutting portion 21 may include a plurality of cutting rods 212 arranged at the outer sidewall of the balloon 10 at intervals along the circumference of the balloon 10. A plurality of cutting rods 212 may be uniformly spaced along the circumference of the balloon 10, and each cutting rod 212 may extend along the length of the balloon 10, so that the thrombus cutting portion 21 may cut thrombus from a plurality of positions along the circumference of the balloon 10 and in the entire length direction of the balloon 10. The cutting rod 212 can adopt a rod-shaped structure with non-linear transition, the balloon can be tightly attached to the outer side of the balloon after being contracted, and the cutting rod can be unfolded by matching the diameter of the balloon through the self stretching deformation capacity in the balloon expansion process, so that the effect of cutting thrombus or plaque is achieved.

Further, the cutting rod 212 may be an S-wave shaped rod extending along the axial direction of the capsule 10 in an S-wave shape, the S-wave shaped rod includes a plurality of arc-shaped rod sections, and different arc-shaped rod sections clamp the capsule 10 so that the S-wave shaped rod abuts against the outer wall of the capsule 10, as shown in fig. 2. The S-shaped wave bars are arranged in a mode of abutting against or clinging to the balloon, so that the S-shaped wave bars can be better expanded and contracted along with the balloon, the expansion force of the balloon 10 can be better acted on the thrombus cutting part 21, and the thrombus can be better cut.

As shown in fig. 2, the S-shaped wave bar has two arc-shaped bar sections 2121, each of which can be processed into a three-dimensional shape that can be fitted to the peripheral wall of the capsule 10 and extended in an S-shape, and the two arc-shaped bar sections 2121 grip the capsule 10 from different sides of the capsule 10, respectively, so that the cut portions 21 can be held on the capsule 10 all the time when the capsule 10 is expanded and contracted. The arcuate stem section 2121 of the S-wave stem has the greatest magnitude of bending when the balloon 10 is in its naturally contracted state. When the balloon 10 is in the expanded state, the arc rod segments 2121 of the S-shaped rods are gradually stretched by the axial pulling force generated by the expansion of the balloon 10, and at this time, the arc rod segments 2121 of the S-shaped rods slide radially and axially against the outer wall of the balloon 10, and the bending amplitude is minimized at the end of the expansion of the balloon 10, as shown in fig. 1. In other examples, the S-wave bar may include more arc-shaped bar segments, and is not limited herein.

Alternatively, the peaks and crests, and the troughs and troughs of the plurality of S-shaped wave bars are all disposed adjacent to each other in the circumferential direction of the balloon 10, and the adjacent S-shaped wave bars do not interfere with each other when expanded as the balloon 10 is inflated. Thereby facilitating the arrangement of more cutting rods on the capsule 10 for better cutting of the thrombus.

The proximal end and the distal end of the cutting rod 212 are fixedly connected to the tube body 11 to fix the thrombus cutting portion 21 to the balloon catheter 1. The cutting shaft 212 may be welded to the tube body 11 through the welding portion 211 at the proximal end thereof and the welding portion 213 at the distal end thereof, or may be adhered to the tube body 11 by glue, so that the thrombus cutting portion 21 is firmly fixed to the balloon catheter 1.

Both ends of the cutting rod 212 include connection sections, respectively. The connecting section comprises an extending section 2122 with the length matched with the frustum-shaped bag body part, a fixing section 2123 fixedly arranged on the outer side wall of the cylindrical bag body part and a bending part for connecting the extending section 2122 and the fixing section 2123, and the shape of the bending part is matched with the shape of the joint of the frustum-shaped bag body part and the cylindrical bag body part. The fixation of the cutting rod 212 to the balloon 10 by the fixation section 2123 helps the cutting rod 212 to maintain its position on the outer wall of the balloon 10 when inflated and deflated. It should be noted that, in some examples, the fixing section 2123 may not be fixedly connected to the capsule 10, but only needs to be attached to the surface of the capsule 10.

It should be noted that, in some examples, the thrombus cutting portion may also include a plurality of cutting rods fixed to the outer wall of the balloon at intervals along the circumferential direction of the balloon, and the cutting rods may be linear, and may be fixed to the outer wall of the balloon by adhesion, so as to be also capable of synchronously expanding and contracting along with the balloon.

The embolectomy basket comprises a basket cutting part 22 and a collecting part 23 which are smoothly connected from the proximal end to the distal end. The peripheral wall of the basket cutting portion 22 has a lattice structure, and the proximal end of the basket cutting portion 22 has an opening. The outer diameter of the basket cutting part 22 is larger than that of the contracted thrombus cutting part 21, the basket cutting part can be tightly attached to the inner wall of a blood vessel by utilizing the self supporting force, and when the balloon catheter 1 is dragged, the opening edge of the basket cutting part 22 and the grids of the peripheral wall can be further cut and collected with thrombus. The collecting part 23 may be a dense mesh structure, which may facilitate filtering and collecting fine thrombi, preventing the thrombi from escaping.

Specifically, the basket cutting part 22 may include a plurality of first V-shaped bars 221 and a plurality of second V-shaped bars 222. The opening of the first V-bar 221 is larger than the opening of the second V-bar 222, and the size of the first V-bar 221 is larger than the size of the second V-bar 222. The first V-shaped rods 221 are circumferentially and axially connected to form a circumferentially closed-loop tubular structure. The openings of the second V-shaped rods 222 are all facing proximally, and the open ends of the second V-shaped rods 222 are butted against the open ends of the first V-shaped rods 221, which are open to the distal end, to form a grid. The provision of the second V-shaped bar 222 effectively increases the lattice density of the basket cutting portion and the strength of the basket.

The basket cutting part 22 may further include a plurality of fixing links 223. The proximal end of the basket cutting part 22 is a first V-shaped rod 221 with an opening facing the proximal end, the distal ends of the fixing connecting rods 223 are respectively connected with the distal ends of the first V-shaped rods 221 at the proximal end of the basket cutting part 22, and the proximal ends of the fixing connecting rods 223 are surrounded and fixedly arranged on the tube body 11. The number of fixed links 223 may be the same as the number of cutting bars 212, with the proximal ends of the fixed links 223 being connected to the distal ends of the cutting bars 212, respectively.

It should be noted that the thrombus taking basket and the thrombus cutting portion 21 can be made of nickel-iron pipes by an integrated laser cutting process, so that the thrombus taking basket and the thrombus cutting portion 21 can be fixedly arranged on the balloon catheter 1 through the welding portion 211 at the proximal end of the balloon body 10 and the welding portion 213 at the distal end of the balloon body 10, and transmission of the trimming force in the pushing and withdrawing processes of the vascular opening device is ensured. Of course, the thrombus extraction basket and the thrombus cutting portion may be separately manufactured and fixed to the tube body 11.

The plurality of fixed links 223 form openings between the basket cutting portions 22 through which thrombus may enter and be collected in the thrombus removal basket.

The collecting portion 23 may include a plurality of bending links 231, and distal ends of the plurality of bending links 231 are convergently connected to the distal end of the tube 11. The proximal ends of the plurality of bending connecting rods 231 are respectively connected to a plurality of distal end connecting nodes of the basket cutting portion 22 in parallel, and the plurality of distal end connecting nodes are respectively a wave crest of the second V-shaped rod and a connecting node between the second V-shaped rod and the first V-shaped rod with the opening facing the distal end, so that the collecting portion 23 forms a dense grid structure, thereby effectively filtering and intercepting thrombus. The distal end of the tube body 11 of the balloon catheter 1 can also be in a tip structure with a conical transition, so that the volume of the distal end of the embolectomy basket can be reduced, and the thrombus storage space of the collecting part 23 can be increased.

The embolectomy support 2 further comprises a ball-end guide wire 24 which is arranged at the far end of the embolectomy basket and extends along the axial direction. The ball nose guidewire 24 may include: a ball head 241 and a resilient telescoping structure 242 disposed between the ball head 241 and the distal end of the embolectomy basket. The elastically stretchable structure may be a spring structure made of memory metal or stainless steel. The ball 241 may be spherical or ellipsoidal. The thrombus opening device can be directly guided to the position of the vascular embolism by the ball head guide wire 24, so that the process of establishing a thrombus removal channel by the guide wire can be cancelled. When the thrombus opening device is pushed in a blood vessel, the round or ellipsoidal ball 241 can play a role in guiding, and the elastic telescopic structure 242 of the ball guide wire 24 can limit the pushing force acting on the inner wall of the blood vessel in the pushing process, so that the blood vessel wall can be protected, and the intima of the blood vessel can be prevented from being damaged.

As shown in FIG. 4, the thrombectomy stent of the present embodiment has substantially the same structure as the thrombectomy stent of the first embodiment, and comprises a thrombectomy basket and a thrombectomy cutting portion 21, except that the thrombectomy device of the present embodiment does not comprise a ball-end guide wire. Accordingly, the delivery system of the vascular access device may establish the thrombectomy channel in other ways, such as by a guidewire that may be passed through the balloon catheter and the thrombectomy stent and out the distal end thereof.

With reference to fig. 1 and 2, the method for using the vascular access device according to the embodiment of the present invention comprises the following steps:

in the thrombus clearing operation treatment, the blood vessel opening device reaches a specified lesion part along the catheter, the catheter is withdrawn to release the thrombus removal stent 2, the thrombus removal basket is tightly attached to the inner wall of the blood vessel, and then the catheter is withdrawn continuously until the balloon 10 in the balloon catheter 1 is completely exposed, as shown in fig. 1, and at the moment, the thrombus cutting part 21 of the thrombus removal stent 2 is tightly attached to the outer wall of the balloon. The balloon body 10 is inflated, the plurality of S-shaped cutting rods 212 of the thrombus cutting part 21 are expanded along with the balloon, thrombus or plaque on the vessel wall is cut, and the fallen embolus or plaque enters the embolectomy basket of the embolectomy stent 2. And then, the saccule is contracted to an initial state, the catheter is stabilized, the vascular opening device is integrally withdrawn, the cutting part of the basket in the thrombus taking stent further cuts off thrombus or plaque, the cut thrombus or plaque enters and is collected in the thrombus taking basket, and the vascular opening device is continuously withdrawn and completely enters the catheter until the thrombus or plaque is completely pulled out of the body, so that the blood vessel or plaque is removed.

Based on the technical scheme, the embodiment of the invention at least has the following advantages and positive effects:

according to the vascular opening device provided by the embodiment of the invention, the saccule is expanded to drive the thrombus cutting part to remove and collect thrombus for the first time, then the saccule catheter is dragged, and thrombus can be removed and collected for the second time through the thrombus removing basket, so that the operation is very simple and convenient, the secondary thrombus removing operation can be completed, and a better removing effect can be achieved for different thrombus types or plaques.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A vascular access device, comprising: a balloon catheter and a thrombus removal bracket;

the balloon catheter has an inflatable and deflatable balloon;

the thrombectomy support comprises: a thrombus taking basket and a thrombus cutting part;

the thrombus cutting part is connected with the balloon catheter, is arranged around the outer side wall of the balloon body and can expand and contract along with the balloon body;

the thrombus taking basket is of an expandable and contractible bracket structure, is positioned at the far end of the balloon body and is fixedly arranged on the balloon catheter.

2. The vessel opening device according to claim 1, wherein the balloon catheter further comprises a tube fixedly connected to the tubular lumen of the balloon, both ends of the tube extending out of the balloon;

thrombus cutting portion includes a plurality of edges the circumference interval of utricule arranges in the cutting rod of utricule lateral wall, the near-end and the distal end of cutting rod all with body fixed connection.

3. The vessel opening device according to claim 2, wherein the cutting rod is an S-wave shaped rod extending in an S-wave shape along the balloon axial direction;

the S-shaped wave-shaped rod comprises a plurality of arc-shaped rod sections, and different arc-shaped rod sections clamp the capsule body so that the S-shaped wave-shaped rod abuts against the outer wall of the capsule body.

4. The vascular access device of claim 3, wherein the peaks and the peaks, the valleys and the valleys of the plurality of S-shaped struts are arranged adjacent to each other in a circumferential direction of the balloon, and adjacent S-shaped struts do not interfere with each other when expanded as the balloon is expanded.

5. The vascular access device of claim 2, wherein the embolectomy basket comprises a basket cutting portion and a collecting portion which are smoothly connected in sequence from the proximal end to the distal end;

the basket cutting part comprises a plurality of first V-shaped rods and a plurality of second V-shaped rods; the opening of the first V-shaped rod is larger than that of the second V-shaped rod, and the size of the first V-shaped rod is larger than that of the second V-shaped rod;

the plurality of first V-shaped rods are connected in the circumferential direction and in the axial direction to form a circumferential closed-loop cylinder structure;

the openings of the second V-shaped rods face to the proximal end, and the open ends of the second V-shaped rods are in butt joint with the open end of the first V-shaped rod, the opening of which faces to the distal end, to form a grid.

6. The vascular access device of claim 5, wherein the collection portion comprises a plurality of bent links;

the far ends of the plurality of bent connecting rods are converged and connected to the far end of the tube body;

the near ends of the bending connecting rods are respectively connected to a plurality of far end connecting nodes of the net basket cutting part in parallel, and the far end connecting nodes are respectively the wave crests of the second V-shaped rods and the connecting nodes between the second V-shaped rods and the first V-shaped rods with the openings facing far ends.

7. The vascular access device of claim 5, wherein the basket cutting portion further comprises a plurality of fixation links;

the near end of the basket cutting part is provided with the first V-shaped rod with an opening facing the near end, the far ends of the fixed connecting rods are respectively connected with the far ends of the first V-shaped rods at the near end of the basket cutting part, and the near ends of the fixed connecting rods surround and are fixedly arranged on the tube body;

the plurality of fixed links form an opening of the basket cutting portion therebetween.

8. The vessel opening device according to claim 2, wherein the balloon is cylindrical, and has two truncated cone-shaped ends when expanded, and the two ends of the cutting rod respectively comprise connecting sections;

the connecting section comprises an extending section with the length matched with the frustum-shaped bag body part, a fixing section fixedly arranged on the outer side wall of the cylindrical bag body part and a bending part connected with the extending section and the fixing section, and the shape of the bending part is matched with the shape of the joint of the frustum-shaped bag body part and the cylindrical bag body part.

9. The vascular access device of claim 1, wherein the thrombectomy stent further comprises a ball-end guidewire disposed at a distal end of the thrombectomy basket and extending axially;

the ball head guide wire comprises: the bulb and set up in the bulb with get the elasticity extending structure between the bolt support distal end.

10. The vascular access device of claim 9, wherein the resilient telescoping structure is a spring structure made of memory metal or stainless steel.