Intravascular stent

Abstract

The invention relates to an intravascular stent. The intravascular stent comprises a covered stent; the artificial blood vessel is provided with a connecting end and an opening end; 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 structure is connected to the peripheral face of the artificial blood vessel in a surrounding mode, and a first containing space with an opening is formed between the first skirt structure and the peripheral face of the artificial blood vessel; the skirt structure is arranged close to the open end of the artificial blood vessel, and an opening of the first containing space faces the open end of the artificial blood vessel. According to the intravascular stent, the suturing difficulty can be reduced, and blood leakage at the suturing position after the intravascular stent is sutured with an autologous blood vessel is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vascular stent. Background Art

[0002] Artificial blood vessels are mainly used clinically in cardiovascular surgery to replace damaged, dilated, or narrowed large and medium arteries in the treatment of arterial dissection, aortic aneurysm, arteriosclerosis obliterans, and other diseases that require replacement of native blood vessels. During the operation, the doctor needs to manually suture the artificial blood vessels and the autologous blood vessels, which requires a high level of proficiency. Especially when suturing blood vessels with smaller diameters, such as visceral branches, coronary artery branches, and renal artery branches, the suturing operation is extremely difficult. Figure 1 As shown, in the existing artificial blood vessel replacement surgery, the artificial blood vessel 2 and the autologous blood vessel 1 are generally sutured by edge-to-edge anastomosis. During the operation, the doctor needs to clamp the artificial blood vessel 2 with forceps and keep it in a position aligned with the autologous blood vessel 1 so as to facilitate suturing with suture 3. This suturing method is difficult to operate, and there is a risk of bleeding at the joint between the artificial blood vessel and the autologous blood vessel after the operation is completed. Summary of the invention

[0003] Based on this, in order to solve the problem of high difficulty in suturing artificial blood vessels in the prior art, it is necessary to provide a vascular stent that can reduce the difficulty of suturing and has a good anti-bleeding effect.

[0004] The present invention provides a vascular stent, comprising:

[0005] Stent graft;

[0006] An artificial blood vessel connected to the end of the stent graft, and the artificial blood vessel and the stent graft jointly define a circulation channel; the artificial blood vessel has a connecting end and an open end, and the connecting end is fixedly connected to the stent graft;

[0007] A first skirt structure is circumferentially connected to the outer peripheral surface of the artificial blood vessel, and a first accommodating 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 accommodating space faces the opening end of the artificial blood vessel.

[0008] In one embodiment, the artificial blood vessel includes a tubular body and at least one support ring, wherein the support ring extends along the circumference of the tubular body, and a projection of the support ring along the radial direction of the tubular body falls on the first skirt structure.

[0009] In one embodiment, the skirt structure includes a fixed end and a free end, the fixed end is connected to the artificial blood vessel, and the free end is away from the artificial blood vessel relative to the fixed end; on the longitudinal section of the vascular stent, the inner contour line from the fixed end to the free end of the skirt structure is an arc; wherein the longitudinal section is parallel to and passes through the central axis of the vascular stent.

[0010] In one embodiment, the thickness of the first skirt structure gradually increases from the fixed end to the free end.

[0011] In one embodiment, the first skirt structure includes a gradually expanding section and a parallel section, the gradually expanding section connects the artificial blood vessel and the parallel section, and the parallel section is parallel to the outer peripheral surface of the artificial blood vessel.

[0012] In one embodiment, the blood vessel stent also includes a second skirt structure, which is arranged around the outer circumference of the first skirt structure; one end of the second skirt structure is fixedly connected to the first skirt structure, and the other end is away from the first skirt structure and closer to the opening end of the artificial blood vessel than the free end of the first skirt structure.

[0013] In one embodiment, the vascular stent also includes a third skirt structure, which is circumferentially connected to the outer peripheral surface of the artificial blood vessel; a third accommodating space is provided between the third skirt structure and the artificial blood vessel or the coated stent, and the opening of the third accommodating space faces the coated stent.

[0014] In one embodiment, the third skirt structure has multiple folding areas and sheet areas, and the folding areas and sheet areas are spaced apart along the circumferential direction of the third skirt structure; the sum of the arc lengths of the outer edges of the multiple sheet areas is less than or equal to the outer diameter of the coated stent.

[0015] In one of the embodiments, the third skirt structure is provided with a plurality of through holes penetrating in the thickness direction thereof, and the plurality of through holes are arranged along the circumference of the third skirt structure; the plurality of through holes are used for passing a strap, and when the strap is in a tightened state, the third skirt structure is tightly attached to the coated stent.

[0016] In one embodiment, the stent graft comprises a bare stent, an inner membrane and an outer membrane;

[0017] The inner membrane is attached to the inner surface of the bare stent, and the outer membrane is attached to the outer surface of the bare stent; the lengths of the inner membrane and the outer membrane exceed the end of the bare stent at least at one end connected to the artificial blood vessel on the coated stent, and the inner membrane, the outer membrane and the end of the bare stent are surrounded to form a sandwich;

[0018] The connecting end of the artificial blood vessel is fixed in the interlayer.

[0019] In one embodiment, the bare stent includes a mesh tube structure formed by interlacing at least one braided wire.

[0020] Since the vascular stent of the present invention has the skirt structure and the accommodation space between the skirt structure and the artificial blood vessel, when the vascular stent is sutured with the autologous blood vessel, the autologous blood vessel can be placed in the accommodation space, that is, the junction of the vascular stent and the autologous blood vessel is pre-positioned, which is convenient for doctors to sew. After suturing, the end of the autologous blood vessel is wrapped in the accommodation space to avoid bleeding at the junction of the autologous blood vessel and the artificial blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the suturing method of an artificial blood vessel and an autologous blood vessel in the prior art;

[0022] Figure 2 Schematic diagram of the structure of the vascular stent in Example 1 of the present invention (the outer membrane of the stent graft is made transparent);

[0023] Figure 3 is a longitudinal cross-sectional view of the vascular stent in Example 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection between the vascular stent and the autologous blood vessel in Example 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the vascular stent in Example 1 of the present invention before release;

[0026] Figure 6 is a schematic structural diagram of an artificial blood vessel and a first skirt structure in Example 1 of the present invention;

[0027] Figure 7 is a longitudinal cross-sectional view of a vascular stent in another embodiment of the present invention;

[0028] Figure 8 for Figure 3 The enlarged view of point A in the middle;

[0029] Fig. 9 is a schematic diagram of the structure of the vascular stent in Example 2 of the present invention;

[0030] Fig.10 is a longitudinal cross-sectional view of the vascular stent in Example 2 of the present invention;

[0031] Fig.11 is a schematic structural diagram of a vascular stent in Example 3 of the present invention;

[0032] Fig.12 is a schematic structural diagram of the third skirt structure in Example 4 of the present invention;

[0033] Fig.13 Schematic diagram of the structure of the vascular stent in Example 4 of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] In order to more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined herein as commonly used terms in the field of interventional medicine. Specifically, "distal end" refers to the end away from the operator during the surgical operation, "proximal end" refers to the end close to the operator during the surgical operation, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction.

[0037] Example 1

[0038] like Figure 2 As shown, this embodiment provides a vascular stent 100, which includes an artificial blood vessel 110, a stent graft 120 and a first skirt structure 130; Figure 3 As shown, the artificial blood vessel 110 has a connection end 111 and an open end 112, the connection end 111 is fixedly connected to the stent graft 120, and the artificial blood vessel 110 and the stent graft 120 jointly define a circulation channel 140. The circulation channel 140 is used for blood flow to pass through.

[0039] The first skirt structure 130 is circumferentially connected to the outer peripheral surface of the artificial blood vessel 110, and 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 arranged close to the opening end 112 of the artificial blood vessel 110, and the opening of the first accommodating space 131 faces the opening end 112 of the artificial blood vessel 110.

[0040] Specifically, the fixed end 132 is connected to the artificial blood vessel 110, and the free end 133 is away from the artificial blood vessel 110; 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 peripheral surface of the artificial blood vessel 110 or the outer peripheral surface of the coated stent 120.

[0041] Since the vascular stent 100 of the present invention has the first skirt structure 130 and the accommodation space 131 between the first skirt structure 130 and the artificial blood vessel 110, when the vascular stent 100 is sutured with the autologous blood vessel, the autologous blood vessel can be placed in the accommodation space 131, that is, the junction of the vascular stent 100 and the autologous blood vessel is pre-positioned, which is convenient for doctors to sew. After suturing, the end of the autologous blood vessel is wrapped in the accommodation space 131 to prevent bleeding at the junction of the autologous blood vessel and the artificial blood vessel 110.

[0042] like Figure 4 As shown, when the vascular stent 100 of this embodiment is used to connect the two 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 and the artificial blood vessel 110 are sutured by 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 supporting force of the stent graft 120 is sufficient to fix it in the autologous blood vessel 20. Figure 5 The state of the vascular stent 100 described in this embodiment before implantation is shown. Before implantation, the restraining wire 01 restrains the coated stent 120 and wraps around the pull rod 02 back and forth. When the coated stent 120 is placed in the autologous blood vessel 20 and adjusted to the expected position, the pull rod 02 is pulled out to loosen the restraining wire 01 and release the coated stent 120. In actual use, the artificial blood vessel 110 and the autologous blood vessel 20 can be connected first and then the coated stent 120 can be released, or the coated stent 120 can be released first and then the artificial blood vessel 110 and the autologous blood vessel 20 can be connected. Figure 5 This is only a demonstration of one of the release methods in the present invention. In other embodiments, other conveyors may be used to complete the delivery and release of the coated stent.

[0043] In this embodiment, review Figure 3 In the longitudinal section of the stent 100, the inner contour line from the fixed end 132 to the free end 133 of the first skirt structure 130 is a curve; wherein the longitudinal section is parallel to and passes through the central axis Z of the stent 100. The first skirt structure 130 in this embodiment is generally bowl-shaped, such as Figure 4As shown, when the end of the autologous blood vessel 20 is sleeved outside the open 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 to make the first skirt structure 130 close to the autologous blood vessel 20, which is convenient for subsequent suturing. Specifically, the needle used 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 passes back to the outer peripheral surface of the first skirt structure 130 to form a suture line 30. After suturing one or more circles along the circumferential direction of the first skirt structure 130, the end of the autologous blood vessel 20 is fixed in the accommodation space 131 between the first skirt structure 130 and the artificial blood vessel 110, effectively avoiding bleeding at the end of the artificial blood vessel 110 after suturing.

[0044] like Figure 3 As shown, the thickness of the first skirt structure 130 gradually increases from the fixed end 132 to the free end 133. The fixed end 132 is thinner, that is, the thickness of the connection between the first skirt structure 130 and the artificial blood vessel 110 is thinner, which is conducive to improving the flexibility of the first skirt structure 130, and the first skirt structure 130 can be closely attached to the autologous blood vessel during suturing. The thickened free end 133 makes it easier for doctors to use tweezers to clamp the first skirt structure 130 to adjust the position of the first skirt structure 130, which is convenient for suturing.

[0045] In this embodiment, if Figure 6 As shown, the artificial blood vessel 110 includes a tubular body 113 and at least one support ring 114, wherein the support ring 114 extends along the circumference of the tubular body 113, and the projection of the support ring 114 along the radial direction of the tubular body 113 falls on the first skirt structure 130. Therefore, when the first skirt structure 130 is subjected to radial inward pressure, the support ring 114 can provide radial support force to the first skirt structure 114 to prevent the artificial blood vessel 110 from collapsing. In this embodiment, the support ring 114 is arranged on the outer circumferential surface of the tubular body 113, and in other embodiments, the support ring 114 can be arranged in the lumen of the tubular body 113 or embedded in the wall.

[0046] The material of the tubular body 113 may be spandex fiber, polyester cloth, or ePTFE resin. When the tubular body 113 is formed of polyester cloth, the polyester cloth may be plain polyester cloth or threaded polyester cloth. The first skirt structure 130 may be made of the same material as the tubular body 113, or other soft materials. The support ring 114 is made of nickel-titanium wire or other biocompatible materials, and may be a ring structure in which a plurality of "V-shaped" structures are connected in sequence circumferentially, a ring structure in which a plurality of "U-shaped" structures are connected in sequence circumferentially, or a ring structure without undulations.

[0047] Since the tubular body 113 is made of the above-mentioned material, it has high softness, and accordingly, its radial support force is not high. Adding the support ring 114 can improve the local radial support force of the artificial blood vessel 110. The support ring 114 is only arranged in the radial direction corresponding to the first skirt structure 130, which does not affect the overall flexibility of the artificial blood vessel 110 and provides radial support force for the doctor when suturing the first skirt structure 130. Specifically, when the doctor is suturing the autologous blood vessel 20 and the artificial blood vessel 110, since the suturing needle pierces radially inward from the outer peripheral surface of the first skirt structure 130, it is inevitable to generate pressure on the artificial blood vessel 110 located in the autologous blood vessel 20. Since the artificial blood vessel 110 is provided with the support ring 114 at the position corresponding to the first skirt structure 130, the local collapse of the artificial blood vessel 110 can be avoided, which is convenient for the doctor to suturing.

[0048] like Figure 7 Another first skirt structure 130a in the embodiment shown, the first skirt structure 130a includes a gradually expanding section 134a and a parallel section 135a, the gradually expanding 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. An angle α is formed between the gradually expanding section 134a and the outer peripheral surface of the artificial blood vessel 110, and the angle range of the angle α is between 15°-90°, so that the accommodation 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 at the same time, the angle α is prevented from being too large, which makes it difficult for the first skirt structure 130a to fit closely to the artificial blood vessel 110a.

[0049] like Figure 3 and Figure 8As shown, the stent graft 120 includes a bare stent 121, an inner membrane 122 and an outer membrane 123; 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 allow the stent graft 120 to form a circumferentially closed lumen, and when the stent graft 120 releases its support in the autologous blood vessel, blood leakage through the stent graft 120 is effectively prevented.

[0050] The length of the inner membrane 122 and the outer membrane 123 at least exceeds the end of the bare stent 121 at the end connected to the artificial blood vessel 110 on the coated stent 120, and the inner membrane 122, the outer membrane 123 and the end of the bare stent 121 enclose a sandwich 124. The connecting end 111 of the artificial blood vessel 110 is fixed in the sandwich 124. The artificial blood vessel 110 is hot-melt-bonded or sutured with the inner membrane 122 and the outer membrane 123 of the coated stent 120. After the connection is completed, the inner membrane 122 and the outer membrane 123 wrap the connecting end 111 of the artificial blood vessel 110, which can effectively prevent blood from leaking from the connection between the artificial blood vessel 110 and the coated stent 120.

[0051] Among them, the bare stent 121 includes a mesh tube structure formed by interlacing and weaving at least one braided wire. Specifically, in this embodiment, the bare stent 121 includes a plurality of wave coils arranged at intervals along the axial direction of the coated stent 120. Each wave coil has a plurality of wave crests and wave troughs arranged along the circumferential direction, and a wave rod connecting the wave crests and wave troughs. The wave crests and wave troughs of two adjacent wave coils are hooked with each other. The bare stent in this embodiment has a strong ability to resist shortening and a large radial supporting force, and can be stably supported in the autologous blood vessel without displacement. Furthermore, anchoring structures such as barbs can be added to the bare stent to further prevent the coated stent from shifting in the autologous blood vessel.

[0052] In this embodiment, the artificial blood vessel 110 is further provided with a developing point 150. Figure 2 The developing points 150 are respectively arranged at both ends of the artificial blood vessel 110 , and the developing points are mainly used to determine the location of the artificial blood vessel 110 during postoperative follow-up.

[0053] Example 2

[0054] The main difference between the vascular stent 100 disclosed in Example 2 and Example 1 is that Fig. 9 and Fig.10As shown, the vascular stent 200 in this embodiment also includes a second skirt structure 260, which is arranged around the outer peripheral surface of the first skirt structure 230; one end of the second skirt structure 260 is fixedly connected to the first skirt structure 230, and the other end is 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.

[0055] 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 patient's lesion to expose the blood vessel to be treated, and after the vascular stent 200 is released and sutured, the incision of the skin tissue needs to be opened for a certain period of time to observe whether there is bleeding at the suture. Once bleeding is found, the suture should be repaired in time. After the doctor completes the suturing of the first skirt structure 230 and the autologous blood vessel, when bleeding is found at the suture of the first skirt structure 230, the second skirt structure 260 can be covered on the free end 223 of the first skirt structure 230 and the second skirt structure 260 and the autologous blood vessel can be sutured to quickly block the free end 223 of the first skirt structure 230.

[0056] The material of the second skirt structure 260 can be spandex fiber, polyester cloth, or ePTFE resin, and it is highly soft. When suturing the first skirt structure 230 , the second skirt structure 260 can be folded toward the direction of the coated support 220 to prevent the second skirt structure 260 from interfering with the suturing of the first skirt structure 230 .

[0057] Example 3

[0058] The main difference between the vascular stent 100 disclosed in Example 3 and Example 1 is that Fig.11 As shown, the vascular stent 300 in this embodiment also includes a third skirt structure 370, which is circumferentially connected to the outer peripheral surface of the artificial blood vessel 310; a third accommodating space (not marked in the figure) is provided between the third skirt structure 370 and the artificial blood vessel 310 or the coated stent 320, and the opening of the third accommodating space faces the coated stent 320.

[0059] It should be noted that, 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 the third skirt structure 370 and the outer peripheral surface of the artificial blood vessel 310 and / or the stent graft 320 form the third accommodating space. The third skirt structure 370 can be sutured to the artificial blood vessel 310 or the stent graft 320, so that the end of the autologous blood vessel is fixed in the third accommodating space.

[0060] Among them, the specific structures of the first skirt structure 330 and the third skirt structure 370 in this embodiment can adopt any one of the first skirt structure 130 or the first skirt structure 130a in Example 1, and the structures of the first skirt structure 331 and the third skirt structure 370 can be the same or different.

[0061] After the stent graft 320 is released in the autologous blood vessel, the third skirt structure 370 is bent toward the stent graft 320, so that the end of the autologous blood vessel is wrapped in the third accommodating space between the skirt structure 370 and the stent graft 320 or the artificial blood vessel 310. After the third skirt structure 330 is sutured to the stent graft 320 or the artificial blood vessel 310, the third skirt structure 370 further seals the end of the autologous blood vessel to prevent bleeding.

[0062] Compared with artificial blood vessels that require edge-to-edge sutures at both ends, the vascular stent 300 in this embodiment has the first skirt structure 330 and the third skirt structure 370, which reduces the difficulty for doctors to sew the vascular stent 300 and the autologous blood vessels and can better avoid bleeding.

[0063] Example 4

[0064] The main difference between the vascular stent 400 of Example 4 and the vascular stent 300 disclosed in Example 3 is that Fig.12 and Fig.13 As shown, the third skirt structure 470 of the vascular stent 400 of this embodiment has multiple folding areas 471 and sheet areas 472, and the folding areas 471 and sheet areas 472 are spaced apart along the circumferential direction of the third skirt structure 470; the sum of the arc lengths L of the outer edges of the multiple sheet areas 472 is less than or equal to the outer diameter of the coated stent 420.

[0065] In this embodiment, the folding area 471 is softer than the sheet area 472, so that when the third skirt structure 470 covers the periphery of the stent graft 420, the folding area 471 is easier to fold and compress, and then the sheet area 472 is spliced ​​along the circumference of the stent graft 420, so that the third skirt structure 470 fits the periphery of the stent graft 420 more closely. Specifically, the thickness of the folding area 471 is thinner than that of the sheet area 472, or the folding area 471 and the sheet area 472 are made of materials with different softness and spliced ​​to form the third skirt structure 470, the folding area 471 is softer than the sheet area 472, and the folding area 471 is provided with a plurality of folds extending in the radial direction of the third skirt structure 470.

[0066] The third skirt structure 470 is provided with a plurality of through holes 473 penetrating through the thickness direction thereof, and 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 passing the strap 480, and when the strap 480 is in a tightened state, the third skirt structure 470 presses the coated support 420 tightly.

[0067] In this embodiment, the free end of the third skirt structure 470 exceeds the connecting end 411 of the artificial blood vessel 410, so that a third accommodating space (not shown in the figure) is formed between at least a portion of the third skirt structure 470 and the outer peripheral surface of the stent graft 420, and when the band 480 is in a tightened state, the third skirt structure 470 presses the stent graft 420 tightly. The stent graft 420 itself has a certain radial force, which can prevent the collapse of the band 480 when it is tightened. Preferably, the plurality of through holes 473 are arranged near the free end of the third skirt structure 470. In this embodiment, Fig.12 As shown, the strap 480 is passed back and forth on the third skirt structure 470. When the strap 480 is tightened, the folding area 471 is compressed according to the folds thereon. Fig.13 As shown, when the band 480 is in a tightened state, the sheet area 472 is spliced ​​together and can avoid overlapping each other. The band 480 is located outside the sheet area 472, so that the third skirt structure 470 is tightly attached to the coated stent 420, and blood leaks from the gap between the third skirt structure 470 and the coated stent 420.

[0068] It can be understood that when the band 480 is in a tightened state, the folding area occupies a certain circumference, so the sum of the arc lengths L of the outer edges of the multiple sheet areas 472 can be slightly smaller than the outer diameter of the coated support 420.

[0069] In this embodiment, Fig.11Taking the vascular stent 400 in the figure as an example, when the end of the autologous blood vessel enters the third accommodating space between the third skirt structure 470 and the coated stent 420, the doctor can directly tighten the band 480 to press the third skirt structure 470 tightly against the coated stent 420. The end of the autologous blood vessel is fastened in the third accommodating space, eliminating the step of suturing the skirt structure 430 and simplifying the surgical steps.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A vascular stent, characterized in that: include: Stent graft; An artificial blood vessel having a connecting end and an opening end; the connecting end is fixedly connected to the coated stent, and the artificial blood vessel and the coated stent jointly define a circulation channel; A first skirt structure is circumferentially connected to the outer peripheral surface of the artificial blood vessel, and a first accommodating 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 accommodating space faces the opening end of the artificial blood vessel.

2. The vascular stent according to claim 1, characterized in that: The artificial blood vessel includes a tubular body and at least one support ring, wherein the support ring extends along the circumference of the tubular body, and a projection of the support ring along the radial direction of the tubular body falls on the first skirt structure.

3. The vascular stent according to claim 1, characterized in that: The skirt structure includes a fixed end and a free end, the fixed end is connected to the artificial blood vessel, and the free end is away from the artificial blood vessel relative to the fixed end; on the longitudinal section of the blood vessel stent, the inner contour line from the fixed end to the free end of the skirt structure is an arc; wherein the longitudinal section is parallel to and passes through the central axis of the blood vessel stent.

4. The vascular stent according to claim 3, characterized in that: The thickness of the first skirt structure gradually increases from the fixed end to the free end.

5. The vascular stent according to claim 1, characterized in that: The first skirt structure includes a gradually expanding section and a parallel section, the gradually expanding section connects the artificial blood vessel and the parallel section, and the parallel section is parallel to the outer peripheral surface of the artificial blood vessel.

6. The vascular stent according to claim 1, characterized in that: The blood vessel stent also includes a second skirt structure, which is arranged around the outer circumference of the first skirt structure; one end of the second skirt structure is fixedly connected to the first skirt structure, and the other end is away from the first skirt structure and closer to the opening end of the artificial blood vessel than the free end of the first skirt structure.

7. The vascular stent according to claim 1, characterized in that: The blood vessel stent also includes a third skirt structure, which is circumferentially connected to the outer peripheral surface of the artificial blood vessel; a third accommodating space is provided between the third skirt structure and the artificial blood vessel or the coated stent, and the opening of the third accommodating space faces the coated stent.

8. The vascular stent according to claim 7, characterized in that: The third skirt structure has a plurality of folding areas and sheet areas, and the folding areas and sheet areas are spaced apart along the circumferential direction of the third skirt structure; the sum of the arc lengths of the outer edges of the plurality of sheet areas is less than or equal to the outer diameter of the stent graft.

9. The vascular stent according to claim 7, characterized in that: The third skirt structure is provided with a plurality of through holes penetrating in the thickness direction thereof, and the plurality of through holes are arranged along the circumference of the third skirt structure; the plurality of through holes are used for passing a strap, and when the strap is in a tightened state, the third skirt structure is tightly attached to the coated stent.

10. The vascular stent according to claim 1, characterized in that: The covered stent comprises a bare stent, an inner membrane and an outer membrane; The inner membrane is attached to the inner surface of the bare stent, and the outer membrane is attached to the outer surface of the bare stent; the lengths of the inner membrane and the outer membrane exceed the end of the bare stent at least at one end connected to the artificial blood vessel on the coated stent, and the inner membrane, the outer membrane and the end of the bare stent are surrounded to form a sandwich; The connecting end of the artificial blood vessel is fixed in the interlayer.

11. The vascular stent according to claim 10, characterized in that: The bare stent comprises a mesh tube structure formed by interlacing and weaving at least one braided wire.

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