CN119499004A - Vascular stent - Google Patents

Abstract

The invention relates to a vascular stent, which comprises a covered stent, an artificial blood vessel, a first skirt structure and a second skirt structure, wherein the artificial blood vessel is provided with a connecting end and an opening end, the connecting end is fixedly connected with the covered stent, the artificial blood vessel and the covered stent jointly define a circulation channel, the first skirt structure is connected with the outer peripheral surface of the artificial blood vessel in a surrounding mode, a first containing space with an opening is formed between the first skirt structure and the outer peripheral surface of the artificial blood vessel, the skirt structure is arranged close to the opening end of the artificial blood vessel, and the opening of the first containing space faces the opening end of the artificial blood vessel. The vascular stent can reduce the suture difficulty and avoid blood leakage at the suture position after being sutured with an autologous blood vessel.

Description

Vascular stent

Technical Field

The invention relates to the technical field of medical equipment, in particular to a vascular stent.

Background

Vascular prostheses are used clinically mainly in cardiovascular surgery to replace damaged, dilated or stenosed middle-large arteries and other diseases where replacement of their own blood vessels is required in the treatment of aortic dissection, aortic aneurysm, arteriosclerotic occlusion. In the operation process, a doctor is required to suture the artificial blood vessel and the autologous blood vessel manually, and the skill requirement of the doctor is high. Especially when suturing vessels of smaller diameter, such as visceral branches, coronary branches, renal artery branches, the difficulty of suturing is great. As shown in fig. 1, in the conventional vascular prosthesis replacement operation, an artificial blood vessel 2 and a self blood vessel 1 are generally sutured in an edge-to-edge anastomosis manner, and a doctor is required to hold the artificial blood vessel 2 with forceps and keep it aligned with the self blood vessel 1 during the operation, so as to perform suturing with a suture 3. The suture mode has high operation difficulty, and the risk of blood leakage easily occurs at the joint part of the artificial blood vessel and the autologous blood vessel after the operation is finished.

Disclosure of Invention

Based on this, in order to solve the problem of high suturing difficulty of the artificial blood vessel in the prior art, it is necessary to provide a vascular stent which can reduce the suturing difficulty and has good blood leakage preventing effect.

The present invention provides a vascular stent comprising:

a stent graft;

the artificial blood vessel is connected with the end part of the covered stent, and the artificial blood vessel and the covered stent jointly define a circulation channel, and the artificial blood vessel is provided with a connecting end and an opening end, and the connecting end is fixedly connected with the covered stent;

the first skirt edge structure is connected with the outer peripheral surface of the artificial blood vessel in a surrounding mode, a first containing space with an opening is formed between the first skirt edge structure and the outer peripheral surface of the artificial blood vessel, the skirt edge structure is arranged close to the opening end of the artificial blood vessel, and the opening of the first containing space faces the opening end of the artificial blood vessel.

In one embodiment, the prosthesis comprises a tubular body and at least one support ring extending in a circumferential direction of the tubular body, and a projection of the support ring in a radial direction of the tubular body falling on the first skirt structure.

In one embodiment, the skirt structure comprises a fixed end and a free end, wherein the fixed end is connected with the artificial blood vessel, the free end is far away from the artificial blood vessel relative to the fixed end, the inner contour line from the fixed end to the free end of the skirt structure is an arc line on the longitudinal section of the vascular stent, and the longitudinal section is parallel and passes through the central axis of the vascular stent.

In one embodiment, the thickness of the first skirt structure gradually increases from the fixed end to the free end.

In one embodiment, the first skirt structure includes a diverging section and a parallel section, the diverging section connecting the artificial blood vessel and the parallel section, the parallel section being parallel to an outer peripheral surface of the artificial blood vessel.

In one embodiment, the vascular stent further comprises a second skirt structure, wherein the second skirt structure is arranged around the outer peripheral surface of the first skirt structure, one end of the second skirt structure is fixedly connected with the first skirt structure, and the other end of the second skirt structure is far away from the first skirt structure and is closer to the opening end of the artificial blood vessel than the free end of the first skirt structure.

In one embodiment, the vascular stent further comprises a third skirt structure, wherein the third skirt structure is connected to the outer peripheral surface of the artificial blood vessel in a surrounding mode, a third containing space is formed between the third skirt structure and the artificial blood vessel or the covered stent, and an opening of the third containing space faces the covered stent.

In one embodiment, the third skirt structure is provided with a plurality of folding areas and sheet areas, the folding areas and the sheet areas are distributed at intervals along the circumferential direction of the third skirt structure, and the sum of arc lengths of the outer edges of the plurality of sheet areas is smaller than or equal to the outer diameter of the covered stent.

In one embodiment, the third skirt structure is provided with a plurality of through holes penetrating through the thickness direction of the third skirt structure, the through holes are arranged along the circumferential direction of the third skirt structure, the through holes are used for penetrating a strap, and the third skirt structure is tightly attached to the film covering bracket when the strap is in a tightened state.

In one embodiment, the stent graft comprises a bare stent, an inner membrane and an outer membrane;

The inner membrane is attached to the inner surface of the bare stent, the outer membrane is attached to the outer surface of the bare stent, the lengths of the inner membrane and the outer membrane at least exceed the end part of the bare stent at one end connected with the artificial blood vessel on the covered stent, and the inner membrane, the outer membrane and the end part of the bare stent are enclosed to form an interlayer;

The connecting end of the artificial blood vessel is fixed in the interlayer.

In one embodiment, the bare stent comprises a mesh tube structure of at least one braided wire interlaced braid.

The vascular stent provided by the invention has the skirt structure and the accommodating space between the skirt structure and the artificial blood vessel, so that the self blood vessel can be placed in the accommodating space when the vascular stent is sutured with the self blood vessel, namely, the joint of the vascular stent and the self blood vessel is prepositioned, and the vascular stent is convenient for a doctor to suture. And the end part of the autologous blood vessel is wrapped in the accommodating space after suturing, so that blood leakage at the joint of the autologous blood vessel and the artificial blood vessel is avoided.

Drawings

FIG. 1 is a schematic diagram of a suturing method of an artificial blood vessel and an autologous blood vessel in the prior art;

FIG. 2 is a schematic structural view of a stent graft according to example 1 of the present invention (the outer membrane of the stent graft is transparent);

FIG. 3 is a longitudinal cross-sectional view of a stent in example 1 of the present invention;

FIG. 4 is a schematic diagram showing the connection between a stent and an autologous vessel according to example 1 of the present invention;

FIG. 5 is a schematic illustration of a stent of example 1 of the present invention prior to release;

FIG. 6 is a schematic structural diagram of an artificial blood vessel and a first skirt structure in embodiment 1 of the present invention;

FIG. 7 is a longitudinal cross-sectional view of a vascular stent in other embodiments of the present invention;

FIG. 8 is an enlarged view of FIG. 3 at A;

fig. 9 is a schematic structural view of a stent in embodiment 2 of the present invention;

FIG. 10 is a longitudinal cross-sectional view of a stent of example 2 of the present invention;

FIG. 11 is a schematic view showing the structure of a stent in embodiment 3 of the present invention;

FIG. 12 is a schematic view of the third skirt structure in embodiment 4 of the present invention;

fig. 13 is a schematic structural view of a stent in embodiment 4 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

For purposes of more clarity in describing the structure of the present application, the terms "proximal" and "distal" are defined herein as terms commonly used in the interventional medical arts. Specifically, "distal" means an end far from the operator during a surgical operation, "proximal" means an end near the operator during a surgical operation, "axial" means a length direction thereof, and "radial" means a direction perpendicular to the "axial".

Example 1

As shown in fig. 2, the present embodiment provides a vascular stent 100, the vascular stent 100 comprises an artificial blood vessel 110, a covered stent 120 and a first skirt structure 130, as shown in fig. 3, the artificial blood vessel 110 has a connection end 111 and an opening end 112, the connection end 111 is fixedly connected with the covered stent 120, and the artificial blood vessel 110 and the covered stent 120 together define a flow channel 140. Wherein the flow channel 140 is used for blood flow.

The first skirt structure 130 is circumferentially connected to the outer peripheral surface of the artificial blood vessel 110, a first accommodating space 131 with an opening is formed between the first skirt structure 130 and the outer peripheral surface of the artificial blood vessel 110, the skirt structure 130 is disposed near the open end 112 of the artificial blood vessel 110, and the opening of the first accommodating space 131 faces the open end 112 of the artificial blood vessel 110.

Specifically, the fixed end 132 is connected to the artificial blood vessel 110, the free end 133 is far from the artificial blood vessel 110, and the free end 133 and the fixed end 132 do not overlap in the radial direction of the artificial blood vessel 110, so that the accommodating space 131 is formed between the first skirt structure 130 and the outer circumferential surface of the artificial blood vessel 110 or the outer circumferential surface of the stent graft 120.

The vascular stent 100 of the present invention has the first skirt structure 130 and the accommodating space 131 between the first skirt structure 130 and the artificial blood vessel 110, so that when the vascular stent 100 is sutured with the autologous blood vessel, the autologous blood vessel can be placed in the accommodating space 131, i.e. the engagement of the vascular stent 100 and the autologous blood vessel is pre-positioned, which is convenient for a doctor to suture. And the end of the autologous blood vessel is wrapped in the accommodating space 131 after suturing, so as to avoid blood leakage at the junction of the autologous blood vessel and the artificial blood vessel 110.

As shown in fig. 4, when the stent 100 of the present embodiment is used to connect both ends of the severed autologous blood vessel 20, one end of the autologous blood vessel 2 is engaged with the open end 112 of the artificial blood vessel 110, and the autologous blood vessel 20 is sutured to the artificial blood vessel 110 through the first skirt structure 130. The other end of the autologous blood vessel 20 is engaged with the stent graft 120, specifically, the stent graft 120 is supported in the autologous blood vessel 20, and the stent graft 120 has a supporting force sufficient to be fixed in the autologous blood vessel 20. Fig. 5 shows the vascular stent 100 of the present embodiment before implantation. Before implantation, the binding wire 01 binds the covered stent 120 and is looped back and forth on the pull rod 02. When the stent graft 120 is placed in the autologous vessel 20 and adjusted to a desired position, the tie rod 02 is withdrawn, releasing the tie wire 01 and thereby releasing the stent graft 120. In practical use, the artificial blood vessel 110 and the autologous blood vessel 20 may be connected first and then the stent-graft 120 may be released, or the artificial blood vessel 110 and the autologous blood vessel 20 may be connected first and then the stent-graft 120 may be released. Fig. 5 is merely illustrative of one release pattern of the present invention, and in other embodiments, other conveyors may be used to accomplish the delivery and release of the stent graft.

In this embodiment, looking back at FIG. 3, the inner profile of the fixed end 132 to the free end 133 of the first skirt structure 130 is curved in a longitudinal section of the stent 100, wherein the longitudinal section is parallel and passes through the central axis Z of the stent 100. In this embodiment, the first skirt structure 130 is integrally bowl-shaped, as shown in fig. 4, and when the end of the autologous blood vessel 20 is sleeved outside the opening end 112 of the artificial blood vessel 110, the first skirt structure 130 can surround the end of the autologous blood vessel 20. At this time, the doctor radially presses the first skirt structure 130, so that the first skirt structure 130 can be tightly attached to the autologous blood vessel 20, thereby facilitating subsequent suturing. Specifically, the needle for suturing penetrates from the outer peripheral surface of the first skirt structure 130, passes through the first skirt structure 130, the autologous blood vessel 20 and the artificial blood vessel 110, and then radially and outwardly penetrates back to the outer peripheral surface of the first skirt structure 130 to form the suture line 30, and after one or more circles of suture is performed along the circumferential direction of the first skirt structure 130, the end of the autologous blood vessel 20 is fixed in the accommodating space 131 between the first skirt structure 130 and the artificial blood vessel 110, so that the occurrence of blood leakage at the end of the artificial blood vessel 110 after the completion of suturing is effectively avoided.

As shown in fig. 3, the thickness of the first skirt structure 130 gradually increases from the fixed end 132 to the free end 133. The thickness of the fixed end 132 is thinner, i.e. the thickness of the junction between the first skirt structure 130 and the artificial blood vessel 110 is thinner, which is favorable for improving the flexibility of the first skirt structure 130, and the first skirt structure 130 can be tightly attached to the autologous blood vessel during the stitching. The thickened free end 133 facilitates grasping of the first skirt structure 130 by a physician using forceps to adjust the position of the first skirt structure 130 for suturing.

In this embodiment, as shown in fig. 6, the artificial blood vessel 110 includes a tubular body 113 and at least one support ring 114, the support ring 114 extends along the circumference of the tubular body 113, and a projection of the support ring 114 along the radial direction of the tubular body 113 falls on the first skirt structure 130. Thus, the support ring 114 is capable of providing a radially directed support force to the first skirt structure 114 when the first skirt structure 130 is subjected to a radially inward pressure, avoiding collapse of the prosthesis 110. In this embodiment, the support ring 114 is disposed on the outer peripheral surface of the tubular body 113, and in other embodiments, the support ring 114 may be disposed within the lumen of the tubular body 113 or embedded in the wall of the tube.

The material of the tubular main body 113 may be spandex fiber, dacron cloth, or ePTFE resin, and when the tubular main body 113 is formed of dacron cloth, the dacron cloth may be plain dacron cloth or thread dacron cloth. The first skirt structure 130 may be made of the same material as the tubular body 113, or another soft material. The support ring 114 is made of nickel-titanium wire or other biocompatible material, and may be a plurality of annular structures with V-shaped structures connected in turn in the circumferential direction, a plurality of annular structures with U-shaped structures connected in turn in the circumferential direction, or a non-undulating annular structure.

Since the tubular body 113 is made of the above-mentioned material, it has high softness, and accordingly, its radial supporting force is not high, and the addition of the supporting ring 114 can improve the local radial supporting force of the artificial blood vessel 110. The support ring 114 is only radially disposed in correspondence with the first skirt structure 130 without affecting the overall compliance of the vessel prosthesis 110 and providing radial support for the surgeon when suturing the first skirt structure 130. Specifically, when the physician is suturing the autologous blood vessel 20 and the artificial blood vessel 110, since the sutured needle is penetrated radially inward from the outer circumferential surface of the first skirt structure 130, pressure is inevitably generated to the artificial blood vessel 110 located in the autologous blood vessel 20. Because the support ring 114 is disposed at the portion of the artificial blood vessel 110 corresponding to the first skirt structure 130, the artificial blood vessel 110 can be prevented from being partially collapsed, which is convenient for a doctor to suture.

As another first skirt structure 130a in the present embodiment shown in fig. 7, the first skirt structure 130a includes a diverging section 134a and a parallel section 135a, the diverging section 134a connects the artificial blood vessel 110a and the parallel section 135a, and the parallel section 135a is parallel to the outer peripheral surface of the artificial blood vessel 110a. The diverging section 134a forms an included angle α with the outer circumferential surface of the artificial blood vessel 110, and the included angle α ranges from 15 ° to 90 °, so that the accommodating space 131 between the parallel section 135a and the artificial blood vessel 110a is sufficient to accommodate the end of the autologous blood vessel, and meanwhile, the first skirt structure 130a is prevented from being difficult to be tightly attached to the artificial blood vessel 110a due to the excessive included angle α.

As shown in fig. 3 and 8, the stent graft 120 includes a bare stent 121, an inner membrane 122 and an outer membrane 123, wherein the inner membrane 122 is attached to the inner surface of the bare stent 121, and the outer membrane 123 is attached to the outer surface of the bare stent 121. The inner membrane 122 and the outer membrane 123 form a circumferentially closed lumen in the stent graft 120, which effectively prevents blood from leaking through the stent graft 120 when the stent graft 120 is released from supporting the autologous vessel.

The lengths of the inner membrane 122 and the outer membrane 123 at least exceed the end of the bare stent 121 at the end of the covered stent 120 connected with the artificial blood vessel 110, and the inner membrane 122, the outer membrane 123 and the end of the bare stent 121 are enclosed to form an interlayer 124. The attachment end 111 of the prosthesis 110 is secured within the interlayer 124. The artificial blood vessel 110 is thermally fused with or sewn to the inner and outer membranes 122, 123 of the stent graft 120. After the connection is completed, the inner membrane 122 and the outer membrane 123 wrap the connection end 111 of the artificial blood vessel 110, so that leakage of blood from the connection part between the artificial blood vessel 110 and the covered stent 120 can be effectively avoided.

Wherein, the bare stent 121 comprises a mesh tube structure formed by interweaving at least one braiding wire. Specifically, in the present embodiment, the bare stent 121 includes a plurality of wave rings arranged at intervals along the axial direction of the stent graft 120. Each wave ring is provided with a plurality of wave crests and wave troughs which are arranged along the circumferential direction, and wave rods which connect the wave crests and the wave troughs. The wave crests and wave troughs of two adjacent wave rings are hooked with each other. The bare stent in the embodiment has strong anti-shortening capability and large radial supporting force, and can be stably supported in an autologous blood vessel without displacement. Furthermore, anchoring structures such as barbs and the like can be added on the bare stent, so that the tectorial membrane stent is further prevented from shifting in an autologous blood vessel.

In this embodiment, the artificial blood vessel 110 is further provided with a developing point 150. Referring back to fig. 2, the developing points 150 are respectively disposed at two ends of the artificial blood vessel 110, and the developing points are mainly used for determining the position of the artificial blood vessel 110 during the postoperative follow-up.

Example 2

The main difference between the vascular stent 100 disclosed in embodiment 2 and embodiment 1 is that, as shown in fig. 9 and 10, the vascular stent 200 in this embodiment further includes a second skirt structure 260, the second skirt structure 260 is disposed around the outer peripheral surface of the first skirt structure 230, one end of the second skirt structure 260 is fixedly connected with the first skirt structure 230, and the other end is far away from the first skirt structure 230 and closer to the opening end 112 of the artificial blood vessel 110 than the free end 233 of the first skirt structure 230.

The second skirt structure 260 is used to further seal the free end 233 of the first skirt structure 230. In the actual treatment process, it is necessary to cut the skin tissue at the lesion of the patient to expose the blood vessel to be treated, and after releasing and suturing the stent 200, it is necessary to open the incision of the skin tissue for a certain time to see whether there is bleeding at the suturing site. Once the bleeding phenomenon is found, the suture is repaired in time. After the doctor completes the suturing between the first skirt structure 230 and the autologous blood vessel, when blood seepage is found at the suturing position of the first skirt structure 230, the second skirt structure 260 may be covered on the free end 223 of the first skirt structure 230 and the second skirt structure 260 and the autologous blood vessel are sutured, so as to rapidly seal the free end 223 of the first skirt structure 230.

The second skirt edge structure 260 may be made of spandex fiber, dacron cloth, ePTFE resin, and has a high softness, and when the first skirt edge structure 230 is sewn, the second skirt edge structure 260 may be folded toward the direction of the film covered stent 220, so that the second skirt edge structure 260 is prevented from interfering with the sewing of the first skirt edge structure 230.

Example 3

The main difference between the vascular stent 100 disclosed in embodiment 3 and embodiment 1 is that, as shown in fig. 11, the vascular stent 300 in this embodiment further includes a third skirt structure 370, the third skirt structure 370 is circumferentially connected to the outer peripheral surface of the artificial blood vessel 310, a third accommodating space (not shown) is provided between the third skirt structure 370 and the artificial blood vessel 310 or the stent graft 320, and the opening of the third accommodating space faces the stent graft 320.

In this embodiment, the free end of the third skirt structure 370 does not exceed the connection end of the artificial blood vessel 310 in the axial direction, or the free end of the third skirt structure 370 exceeds the connection end and is located outside the stent graft 320, so that the third skirt structure 370 forms the third accommodating space with the outer peripheral surface of the artificial blood vessel 310 and/or the stent graft 320. The third skirt structure 370 may be sewn to the artificial blood vessel 310 or the stent graft 320 such that the end of the autologous blood vessel is fixed in the third receiving space.

The specific structure of the first skirt structure 330 and the third skirt structure 370 in this embodiment may be any one of the first skirt structure 130 and the first skirt structure 130a in embodiment 1, and the structures of the first skirt structure 331 and the third skirt structure 370 may be the same or different.

After the stent graft 320 is released from the blood vessel, the third skirt structure 370 is bent toward the stent graft 320, so that the end of the blood vessel is enclosed in the third receiving space between the skirt structure 370 and the stent graft 320 or the blood vessel prosthesis 310. When the third skirt structure 330 is sewn to the stent graft 320 or the vascular prosthesis 310, the third skirt structure 370 seals the end of the autologous blood vessel further, avoiding leakage.

Compared with an artificial blood vessel with two ends needing edge-to-edge suturing, the vascular stent 300 in the embodiment has the first skirt structure 330 and the third skirt structure 370, so that the difficulty of a doctor in suturing the vascular stent 300 and the autologous blood vessel is reduced, and blood leakage can be better avoided.

Example 4

The main difference between the vascular stent 400 of example 4 and the vascular stent 300 disclosed in example 3 is that, as shown in fig. 12 and 13, the third skirt structure 470 of the vascular stent 400 of this example has a plurality of folding areas 471 and sheet areas 472, the folding areas 471 and the sheet areas 472 are spaced apart along the circumferential direction of the third skirt structure 470, and the sum of the arc lengths L of the outer edges of the plurality of sheet areas 472 is less than or equal to the outer diameter of the stent graft 420.

In this embodiment, the fold area 471 is softer than the sheet area 472, so that when the third skirt structure 470 covers the outer periphery of the stent graft 420, the fold area 471 is easier to fold and compress, and the sheet area 472 is spliced along the circumferential direction of the stent graft 420, so that the third skirt structure 470 is more adhered to the outer periphery of the stent graft 420. Specifically, the thickness of the folded area 471 is thinner than that of the sheet area 472, or the folded area 471 and the sheet area 472 are made of materials with different softness and are spliced to form the third skirt structure 470, the folded area 471 is softer than the sheet area 472, and a plurality of folds extending along the radial direction of the third skirt structure 470 are arranged on the folded area 471.

The third skirt structure 470 is provided with a plurality of through holes 473 penetrating through the thickness direction thereof, the plurality of through holes 433 are arranged along the circumferential direction of the third skirt structure 470, the plurality of through holes 473 are used for penetrating the band 480, and the third skirt structure 470 is pressed against the stent graft 420 when the band 480 is in the tightened state.

In this embodiment, the free end of the third skirt structure 470 extends beyond the attachment end 411 of the blood vessel prosthesis 410 such that a third receiving space (not shown) is formed at least partially between the third skirt structure 470 and the outer peripheral surface of the stent graft 420, wherein the third skirt structure 470 is compressed against the stent graft 420 when the band 480 is in the contracted state. The stent graft 420 itself has a radial force that prevents collapse when the band 480 is tightened. Preferably, the plurality of through holes 473 are disposed adjacent to the free ends of the third skirt structures 470. In this embodiment, as shown in fig. 12, the band 480 is threaded back and forth over the third skirt structure 470, and when the band 480 is tightened, the fold area 471 is compressed by the crease thereon. As shown in fig. 13, when the band 480 is in a tightened state, the sheet regions 472 are spliced and can avoid overlapping, and the band 480 is located outside the sheet regions 472, so that the third skirt structure 470 is tightly attached to the stent graft 420, and blood leaks from the gap between the third skirt structure 470 and the stent graft 420.

It will be appreciated that when the band 480 is in a tightened state, the fold occupies a perimeter, and thus the sum of the arc lengths L of the outer edges of the plurality of sheet areas 472 may be slightly less than the outer diameter of the stent graft 420.

In this embodiment, taking the stent 400 of fig. 11 as an example, after the end of the autologous blood vessel enters the third receiving space between the third skirt structure 470 and the stent graft 420, the doctor can directly tighten the band 480 to tightly press the third skirt structure 470 against the stent graft 420, and the end of the autologous blood vessel is fastened in the third receiving space, thereby omitting the step of suturing the skirt structure 430 and simplifying the operation steps.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (11)

1. A vascular stent, comprising:

a stent graft;

the artificial blood vessel is provided with a connecting end and an opening end, wherein the connecting end is fixedly connected with the covered stent, and the artificial blood vessel and the covered stent jointly define a circulation channel;

the first skirt edge structure is connected with the outer peripheral surface of the artificial blood vessel in a surrounding mode, a first containing space with an opening is formed between the first skirt edge structure and the outer peripheral surface of the artificial blood vessel, the skirt edge structure is arranged close to the opening end of the artificial blood vessel, and the opening of the first containing space faces the opening end of the artificial blood vessel.

2. A vascular stent as in claim 1, wherein,

The vascular prosthesis comprises a tubular body and at least one support ring extending in the circumferential direction of the tubular body, and the projection of the support ring in the radial direction of the tubular body falls on the first skirt structure.

3. A vascular stent as in claim 1, wherein,

The skirt structure comprises a fixed end and a free end, wherein the fixed end is connected with the artificial blood vessel, the free end is far away from the artificial blood vessel relative to the fixed end, the inner contour line from the fixed end to the free end of the skirt structure is an arc line on the longitudinal section of the vascular stent, and the longitudinal section is parallel and passes through the central axis of the vascular stent.

4. A vascular stent as in claim 3, wherein,

The thickness of the first skirt structure gradually increases from the fixed end to the free end.

5. A vascular stent as in claim 1, wherein,

The first skirt edge structure comprises a divergent section and a parallel section, wherein the divergent section is connected with the artificial blood vessel and the parallel section, and the parallel section is parallel to the peripheral surface of the artificial blood vessel.

6. A vascular stent as in claim 1, wherein,

The vascular stent further comprises a second skirt edge structure, wherein the second skirt edge structure is arranged around the outer peripheral surface of the first skirt edge structure, one end of the second skirt edge structure is fixedly connected with the first skirt edge structure, and the other end of the second skirt edge structure is far away from the first skirt edge structure and is closer to the opening end of the artificial blood vessel than the free end of the first skirt edge structure.

7. The vascular stent of claim 1, wherein the stent is a stent,

The vascular stent further comprises a third skirt edge structure which is connected with the outer peripheral surface of the artificial blood vessel in a surrounding mode, a third containing space is arranged between the third skirt edge structure and the artificial blood vessel or the covered stent, and an opening of the third containing space faces the covered stent.

8. The vascular stent of claim 7, wherein,

The third skirt edge structure is provided with a plurality of folding areas and sheet areas, the folding areas and the sheet areas are distributed at intervals along the circumferential direction of the third skirt edge structure, and the sum of the arc lengths of the outer edges of the plurality of sheet areas is smaller than or equal to the outer diameter of the tectorial membrane bracket.

9. The vascular stent of claim 7, wherein,

The third skirt edge structure is provided with a plurality of through holes penetrating through the thickness direction of the third skirt edge structure, the through holes are arranged along the circumferential direction of the third skirt edge structure, the through holes are used for penetrating through a strap, and the third skirt edge structure is tightly attached to the tectorial membrane bracket when the strap is in a tightening state.

10. A vascular stent as in claim 1, wherein,

The tectorial membrane bracket comprises a bare bracket, an inner membrane and an outer membrane;

The inner membrane is attached to the inner surface of the bare stent, the outer membrane is attached to the outer surface of the bare stent, the lengths of the inner membrane and the outer membrane at least exceed the end part of the bare stent at one end connected with the artificial blood vessel on the covered stent, and the inner membrane, the outer membrane and the end part of the bare stent are enclosed to form an interlayer;

The connecting end of the artificial blood vessel is fixed in the interlayer.

11. The vascular stent of claim 10, wherein the stent is further defined as a stent,

The bare stent comprises a net pipe structure formed by interweaving at least one braiding wire.