A vascular stent

Abstract

The present application relates to a kind of vascular stents, comprising: covered stent;Artificial blood vessel with connecting end and open end;The connecting end is fixedly connected with the covered stent, and the artificial blood vessel and covered stent jointly define flow passage;First skirt structure is circumferentially connected in the outer peripheral surface of the artificial blood vessel, and a first accommodating space with opening is formed between the first skirt structure and the outer peripheral surface of the artificial blood vessel;The skirt structure is close to the open end of the artificial blood vessel, and the opening of the first accommodating space is towards the open end of the artificial blood vessel.The vascular stent of the present application can reduce the difficulty of suturing, avoid bleeding after being sutured with autologous blood vessel at the suture.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and in particular to a blood vessel stent. BACKGROUND

[0002] Artificial blood vessels are mainly used in cardiovascular surgery to replace damaged, dilated or stenotic and occluded large and medium-sized arteries and other diseases requiring replacement of the blood vessels. During the operation, the surgeon needs to manually suture the artificial blood vessel and the autologous blood vessel, which requires a high degree of skill. In particular, when suturing small-diameter blood vessels such as visceral branches, coronary artery branches and renal artery branches, the operation difficulty is extremely great. Figure 1 As shown in the prior artificial blood vessel replacement surgery, the edge-to-edge anastomosis method is generally used to suture the artificial blood vessel 2 and the autologous blood vessel 1. During the operation, the surgeon needs to use tweezers to hold the artificial blood vessel 2 and keep it in the position aligned with the autologous blood vessel 1, so as to use the suture 3 for suturing. This suturing method has a large operation difficulty, and after the operation is completed, there is a risk of blood leakage at the joint between the artificial blood vessel and the autologous blood vessel. SUMMARY

[0003] Therefore, 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 blood vessel stent which can reduce the suturing difficulty and has good blood leakage prevention effect.

[0004] The present application provides a blood vessel stent, comprising:

[0005] a covered stent;

[0006] an artificial blood vessel connected with the end of the covered stent, and the artificial blood vessel and the covered stent jointly defining a flow-through passage; the artificial blood vessel has a connecting end and an open end, and the connecting end is fixedly connected with the covered stent;

[0007] a first skirt structure connected around the outer circumferential surface of the artificial blood vessel, a first accommodating space with an opening being formed between the first skirt structure and the outer circumferential surface of the artificial blood vessel; the skirt structure is arranged close to the open end of the artificial blood vessel, and the opening of the first accommodating space faces the open end of the artificial blood vessel.

[0008] In one embodiment, the artificial blood vessel comprises a tubular body and at least one support ring, the support ring extends along the circumference of the tubular body, and the 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 comprises 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; in a longitudinal section of the blood vessel stent, the inner contour line of the skirt structure from the fixed end to the free end is an arc; wherein the longitudinal section is parallel to and passes through the central axis of the blood vessel 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 comprises a diverging section and a parallel section, the diverging 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 further comprises a second skirt structure, 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 to the first skirt structure, and the other end is away from the first skirt structure and closer to the open end of the artificial blood vessel than the free end of the first skirt structure.

[0013] In one embodiment, the blood vessel stent further comprises a third skirt structure, the third skirt structure is circumferentially connected to the outer peripheral surface of the artificial blood vessel; the third skirt structure has a third accommodating space between the artificial blood vessel or the covered stent, and the opening of the third accommodating space faces the covered stent.

[0014] In one embodiment, the third skirt structure has a plurality of folding zones and sheet zones, the folding zones and sheet zones are distributed along the circumferential direction of the third skirt structure; the sum of the arc lengths of the outer edges of the plurality of sheet zones is less than or equal to the outer diameter of the covered stent.

[0015] In one embodiment, a plurality of through holes are arranged on the third skirt structure in the thickness direction, the plurality of through holes are arranged along the circumferential direction of the third skirt structure; the plurality of through holes are used to pass through a belt, and when the belt is in a tightened state, the third skirt structure is tightly attached to the covered stent.

[0016] In one embodiment, the covered stent 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 at least exceed the end of the bare stent at the end of the covered stent connected to the artificial blood vessel, and the inner membrane, the outer membrane, and the end of the bare stent form a sandwich;

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

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

[0020] The blood vessel stent of the present application has the skirt structure and the accommodating space between the skirt structure and the artificial blood vessel, so that when the blood vessel stent is sutured with the autologous blood vessel, the autologous blood vessel can be placed in the accommodating space, i.e. the joint of the blood vessel stent and the autologous blood vessel is pre-positioned, which facilitates the suturing by the doctor. After suturing, the end of the autologous blood vessel is wrapped in the accommodating space, avoiding blood leakage at the joint of the autologous blood vessel and the artificial blood vessel. BRIEF DESCRIPTION OF DRAWINGS

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

[0022] Figure 2 Structure schematic diagram of the blood vessel stent in embodiment 1 of the present application (the outer membrane of the covered stent is transparently treated);

[0023] Figure 3 Longitudinal sectional view of the blood vessel stent in embodiment 1 of the present application;

[0024] Figure 4 Schematic diagram of the connection of the blood vessel stent and the autologous blood vessel in embodiment 1 of the present application;

[0025] Figure 5 Schematic diagram of the blood vessel stent in embodiment 1 of the present application before release;

[0026] Figure 6 Structure schematic diagram of the artificial blood vessel and the first skirt structure in embodiment 1 of the present application;

[0027] Figure 7 Longitudinal sectional view of the blood vessel stent in other embodiments of the present application;

[0028] Figure 8 is Figure 3 Enlarged view of A in FIG. 6;

[0029] Figure 9 Structure schematic diagram of the blood vessel stent in embodiment 2 of the present application;

[0030] Figure 10 Longitudinal sectional view of the blood vessel stent in embodiment 2 of the present application;

[0031] Figure 11 Structure schematic diagram of the blood vessel stent in embodiment 3 of the present application;

[0032] Figure 12 Structure diagram of the third skirt structure in Embodiment 4 of the present application;

[0033] Figure 13 Structure diagram of the vascular stent in Embodiment 4 of the present application. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0035] Unless otherwise defined, 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 application belongs. The terminology used in the description herein is for describing specific embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated 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 the terms commonly used in the field of interventional medicine. Specifically, "distal end" refers to the end that is far away from the operator during the operation, "proximal end" refers to the end that is close to the operator during the operation, "axial direction" refers to the length direction, and "radial direction" refers to the direction perpendicular to the "axial direction".

[0037] Embodiment 1

[0038] As shown in FIG. 1, the present embodiment provides a vascular stent 100, which comprises an artificial blood vessel 110, a covered stent 120 and a first skirt structure 130. Figure 2 As shown in FIG. 1, the artificial blood vessel 110 has a connecting end 111 and an open end 112, the connecting end 111 is fixedly connected with the covered stent 120, and the artificial blood vessel 110 and the covered stent 120 jointly define a flow-through passage 140. The flow-through passage 140 is used for blood flow. Figure 3 The first skirt structure 130 is connected around the outer circumferential 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 circumferential surface of the artificial blood vessel 110; the skirt structure 130 is arranged close to 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.

[0039]

[0040] ​Specifically, the fixed end 132 is connected with 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 first skirt structure 130 and the outer circumferential surface of the artificial blood vessel 110 or the outer circumferential surface of the covered stent 120 form the accommodation space 131.

[0041] The vascular stent 100 of the present application has the first skirt structure 130 and the accommodation 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 accommodation space 131, that is, the joint of the vascular stent 100 and the autologous blood vessel is pre-positioned, which facilitates the doctor to perform suturing. Moreover, after suturing, the end of the autologous blood vessel is wrapped in the accommodation space 131, so as to avoid blood leakage at the joint of the autologous blood vessel and the artificial blood vessel 110.

[0042] As shown in Figure 4 When the vascular stent 100 of the present embodiment is used to connect the two ends of the cut autologous blood vessel 20, one end of the autologous blood vessel 20 is jointed with the open end 112 of the artificial blood vessel 110, and the autologous blood vessel 20 is sutured with the artificial blood vessel 110 through the first skirt structure 130. The other end of the autologous blood vessel 20 is jointed with the covered stent 120, specifically, the covered stent 120 is supported in the autologous blood vessel 20, and the covered stent 120 has a supporting force sufficient to fix it in the autologous blood vessel 20. Figure 5 The state of the vascular stent 100 before implantation in the present embodiment is shown. Before implantation, the restraint line 01 restrains the covered stent 120 and is alternately wound on the pull rod 02. When the covered stent 120 is placed in the autologous blood vessel 20 and adjusted to the desired position, the pull rod 02 is pulled out, so that the restraint line 01 is loosened and the covered stent 120 is released. In actual use, the artificial blood vessel 110 and the autologous blood vessel 20 can be connected first and then the covered stent 120 is released, or the covered stent 120 is released first and then the artificial blood vessel 110 and the autologous blood vessel 20 are connected. Figure 5 Only one release mode in the present application is shown, and other delivery devices can be used to deliver and release the covered stent in other embodiments.

[0043] In the present embodiment, referring back to Figure 3 In the present embodiment, referring back to 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, so that the first skirt structure 130 closely adheres to the autologous blood vessel 20, facilitating subsequent suturing. Specifically, a needle for suturing is inserted from the outer circumferential surface of the first skirt structure 130, penetrates the first skirt structure 130, the autologous blood vessel 20, and the artificial blood vessel 110, and then radially penetrates back to the outer circumferential surface of the first skirt structure 130 to form a suture line 30. After suturing one or more turns 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 blood leakage at the end of the artificial blood vessel 110 after suturing is completed.

[0044] As shown in the drawings, Figure 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 relatively thin, that is, the thickness of the connection between the first skirt structure 130 and the artificial blood vessel 110 is relatively thin, which is beneficial to improve the flexibility of the first skirt structure 130 and enable the first skirt structure 130 to closely adhere to the autologous blood vessel during suturing. The thickened free end 133 facilitates the doctor to use tweezers to clamp the first skirt structure 130 to adjust the position of the first skirt structure 130, facilitating suturing.

[0045] In the present embodiment, as shown in the drawings, Figure 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 circumferential direction 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 a radially inward pressure, the support ring 114 can provide a radial support force to the first skirt structure 114, avoiding the collapse of the artificial blood vessel 110. In the present 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 pipe wall.

[0046] The material of the tubular body 113 can be spandex fiber, polyester fabric, or ePTFE resin. When the tubular body 113 is formed of polyester fabric, the polyester fabric can be plain polyester fabric or threaded polyester fabric. The first skirt structure 130 can be made of the same material as the tubular body 113 or other soft material. The support ring 114 is made of nickel-titanium wire or other biocompatible material, which can be a plurality of "V-shaped" structures connected in sequence in the circumferential direction, a plurality of "U-shaped" structures connected in sequence in the circumferential direction, or a smooth annular structure.

[0047] Since the tubular body 113 is made of the above-mentioned materials, it has high softness, and accordingly, its radial support force is not high. The addition of 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 sutures the autologous blood vessel 20 and the artificial blood vessel 110, the needle for suturing inevitably exerts pressure on the artificial blood vessel 110 located in the autologous blood vessel 20 when it is radially inserted from the outer circumferential surface of the first skirt structure 130. Since the artificial blood vessel 110 is provided with the support ring 114 at the position corresponding to the first skirt structure 130, local collapse of the artificial blood vessel 110 can be avoided, facilitating suturing by the doctor.

[0048] As shown in another first skirt structure 130a in the present embodiment, Figure 7 The first skirt structure 130a includes a tapered section 134a and a parallel section 135a. The tapered section 134a connects the artificial blood vessel 110a and the parallel section 135a, and the parallel section 135a is parallel to the outer circumferential surface of the artificial blood vessel 110a. The tapered section 134a and the outer circumferential surface of the artificial blood vessel 110a form an included angle α, and the angle of the included angle α is in the range of 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, while avoiding the difficulty of the first skirt structure 130a closely adhering to the artificial blood vessel 110a due to the excessively large angle of the included angle α.

[0049] As shown in another first skirt structure 130a in the present embodiment, Figure 3 and Figure 8As shown, the covered stent 120 comprises 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 make the covered stent 120 form a circumferentially closed lumen, which effectively prevents blood from leaking through the covered stent 120 when the covered stent 120 supports the autologous blood vessel.

[0050] 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 to the artificial blood vessel 110, and the inner membrane 122, the outer membrane 123 and the end of the bare stent 121 form a sandwich 124. The connection end 111 of the artificial blood vessel 110 is fixed in the sandwich 124. The artificial blood vessel 110 is heat-welded or stitched with the inner membrane 122 and the outer membrane 123 of the covered stent 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, which can effectively prevent blood from leaking from the connection between the artificial blood vessel 110 and the covered stent 120.

[0051] In this embodiment, the bare stent 121 comprises a mesh tube structure formed by interlacing at least one braided wire. Specifically, in this embodiment, the bare stent 121 comprises a plurality of wave coils arranged at intervals in the axial direction of the covered stent 120. Each wave coil has a plurality of wave crests and wave troughs arranged in the circumferential direction, and a wave rod connecting the wave crests and the wave troughs. The wave crests and the wave troughs of adjacent two wave coils are hooked to each other. The bare stent in this embodiment has strong anti-shrinkage ability and large radial support force, and can stably support in the autologous blood vessel without displacement. Further, anchor structures such as barbs can be added to the bare stent to further prevent the covered stent from shifting in the autologous blood vessel.

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

[0053] Embodiment 2

[0054] The main difference between the vascular stent 100 disclosed in Embodiment 2 and Embodiment 1 is that, Figure 9 and Figure 10As shown, the blood vessel stent 200 in the embodiment further comprises a second skirt structure 260, which is arranged around the outer circumferential 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 away from the first skirt structure 230 and closer to the open 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 actual treatment, it is necessary to cut the skin tissue of the patient to expose the blood vessel to be treated, and after the blood vessel stent 200 is released and sutured, it is necessary to keep the incision of the skin tissue open for a period of time to observe whether there is bleeding phenomenon at the sutured part. Once the bleeding phenomenon is found, the sutured part is repaired in time. When bleeding is found at the sutured part of the first skirt structure 230 after the doctor completes the suture of the first skirt structure 230 and the autologous blood vessel, 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 is sutured with the autologous blood vessel, so as to quickly seal 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, ePTFE resin, which has high softness. When the first skirt structure 230 is sutured, the second skirt structure 260 can be folded towards the covered stent 220, so as to avoid the interference of the second skirt structure 260 with the suture of the first skirt structure 230.

[0057] Embodiment 3

[0058] The main difference between the blood vessel stent 100 disclosed in Embodiment 3 and Embodiment 1 is that, as shown in the figure, Figure 11 As shown, the blood vessel stent 300 in the embodiment further comprises a third skirt structure 370, which is connected around the outer circumferential surface of the artificial blood vessel 310; the third skirt structure 370 has a third accommodating space (not marked in the figure) between the artificial blood vessel 310 or the covered stent 320, and the opening of the third accommodating space faces the covered stent 320.

[0059] It should be noted that in the present embodiment, the free end of the third skirt structure 370 does not exceed the connecting end of the artificial blood vessel 310 in the axial direction, or the free end of the third skirt structure 370 exceeds the connecting end and is located outside the covered stent 320, and thus the third skirt structure 370 forms the third accommodation space with the outer circumferential surface of the artificial blood vessel 310 and / or the covered stent 320. The third skirt structure 370 can be sutured on the artificial blood vessel 310 or the covered stent 320, so that the end of the autologous blood vessel is fixed in the third accommodation space.

[0060] In the present embodiment, the specific structure of the first skirt structure 330 and the third skirt structure 370 can adopt any one of the first skirt structure 130 or the first skirt structure 130a in Embodiment 1, and the structures of the first skirt structure 330 and the third skirt structure 370 can be the same or different.

[0061] After the covered stent 320 is released in the autologous blood vessel, the third skirt structure 370 is bent towards the covered stent 320, so that the end of the autologous blood vessel is wrapped in the third accommodation space between the skirt structure 370 and the covered stent 320 or the artificial blood vessel 310. When the third skirt structure 330 is sutured on the covered stent 320 or the artificial blood vessel 310, the third skirt structure 370 further seals the end of the autologous blood vessel, avoiding blood leakage.

[0062] Compared with the artificial blood vessel which needs to be sutured with edge-to-edge at both ends, the blood vessel stent 300 in the present embodiment has the first skirt structure 330 and the third skirt structure 370, which reduces the difficulty of the doctor in suturing the blood vessel stent 300 and the autologous blood vessel, and can better avoid blood leakage.

[0063] Embodiment 4

[0064] The main difference between the blood vessel stent 400 of Embodiment 4 and the blood vessel stent 300 disclosed in Embodiment 3 is that, as shown in Figure 12 and Figure 13 The third skirt structure 470 of the blood vessel stent 400 in the present embodiment has a plurality of folding regions 471 and sheet regions 472, and the folding regions 471 and the sheet regions 472 are distributed along the circumferential direction of the third skirt structure 470; the sum of the arc lengths L of the outer edges of the plurality of sheet regions 472 is less than or equal to the outer diameter of the covered stent 420.

[0065] In the embodiment, the folding area 471 is softer than the sheet area 472, so that the folding area 471 is easier to fold and compress when the third skirt structure 470 is covered on the outer periphery of the stent graft 420, 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 closely fitted on the outer periphery of the stent graft 420. Specifically, the thickness of the folding area 471 is thinner than the thickness of the sheet area 472, or the folding 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 folding area 471 is softer than the sheet area 472, and a plurality of folds extending in the radial direction of the third skirt structure 470 are arranged on the folding area 471.

[0066] A plurality of through holes 473 are arranged on the third skirt structure 470 and extend through the thickness direction of the third skirt structure 470, and the plurality of through holes 473 are arranged along the circumferential direction of the third skirt structure 470; the plurality of through holes 473 are used to pass through the belt 480, and the third skirt structure 470 is tightly pressed on the stent graft 420 when the belt 480 is in the tightened state.

[0067] In the embodiment, the free end of the third skirt structure 470 exceeds the connecting end 411 of the artificial blood vessel 410, so that at least a part of the third skirt structure 470 and the outer periphery of the stent graft 420 form a third accommodating space (not shown in the figure), and the third skirt structure 470 is tightly pressed on the stent graft 420 when the belt 480 is in the tightened state. The stent graft 420 itself has a certain radial force, which can prevent the belt 480 from collapsing when it is tightened. Preferably, the plurality of through holes 473 are arranged close to the free end of the third skirt structure 470. In the embodiment, as shown in Figure 12 , the belt 480 is passed back and forth on the third skirt structure 470, and the folding area 471 is compressed according to the folds thereon when the belt 480 is tightened. As shown in Figure 13 , when the belt 480 is in the tightened state, the sheet areas 472 are spliced and can avoid overlapping with each other, the belt 480 is located outside the sheet areas 472, so that the third skirt structure 470 is tightly fitted on the stent graft 420, and blood leaks from the gap between the third skirt structure 470 and the stent graft 420.

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

[0069] In the embodiment, the belt 480 is passed through the plurality of through holes 473 and is tightened to compress the folding area 471, so that the third skirt structure 470 is tightly fitted on the stent graft 420. Figure 11For example, when the end of the autologous blood vessel enters the third accommodating space between the third skirt structure 470 and the covered stent 420, the doctor can directly tighten the belt 480 to tightly press the third skirt structure 470 on the covered stent 420, and the end of the autologous blood vessel is fastened in the third accommodating space, thereby eliminating the step of suturing the skirt structure 430 and simplifying the operation steps.

[0070] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist in contradiction, they should be considered within the scope of the present disclosure.

[0071] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A vascular stent, characterized by, The blood vessel stent comprises: a covered stent; an artificial blood vessel having a connection end and an open end; the connection end is fixedly connected with the covered stent, and the artificial blood vessel and the covered stent jointly define a flow passage; a first skirt structure which is connected to the outer circumferential surface of the artificial blood vessel in a surrounding manner, and a first accommodating space with an opening is formed between the first skirt structure and the outer circumferential surface of the artificial blood vessel; the first skirt structure is arranged close to the open end of the artificial blood vessel, and the opening of the first accommodating space faces the open end of the artificial blood vessel; the blood vessel stent further comprises a third skirt structure which is connected to the outer circumferential surface of the artificial blood vessel in a surrounding manner; the third skirt structure has a third accommodating space with the artificial blood vessel or the covered stent, and the opening of the third accommodating space faces the covered stent; the third skirt structure has a plurality of folding areas and a plurality of sheet areas, the folding areas and the sheet areas are distributed 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 covered stent; the folding areas are softer than the sheet areas, and a plurality of creases extending in the radial direction of the third skirt structure are arranged on the folding areas.

2. The blood vessel stent according to claim 1, wherein the artificial blood vessel comprises a tubular body and at least one support ring, the support ring extends along the circumferential direction of the tubular body, and the projection of the support ring along the radial direction of the tubular body falls on the first skirt structure.

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

4. The blood vessel stent according to claim 3, wherein the thickness of the first skirt structure gradually increases from the fixed end to the free end.

5. The blood vessel stent according to claim 1, wherein the first skirt structure comprises 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 circumferential surface of the artificial blood vessel.

6. The blood vessel stent according to claim 1, wherein the blood vessel stent further comprises a second skirt structure which is arranged around the outer circumferential 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 is away from the first skirt structure and closer to the open end of the artificial blood vessel than the free end of the first skirt structure.

7. The blood vessel stent according to claim 1, wherein The third skirt structure is provided with a plurality of through holes penetrating through the thickness direction of the third skirt structure, and the plurality of through holes are arranged along the circumferential direction of the third skirt structure; the plurality of through holes are used for penetrating a belt, and the third skirt structure is tightly attached to the covered stent when the belt is in a tightened state.

8. The vascular stent according to claim 1, wherein, 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 length of the inner membrane and the outer membrane at least exceeds the end of the bare stent at the end of the covered stent connected to the artificial blood vessel, and the inner membrane, the outer membrane and the end of the bare stent enclose a sandwich layer; The connecting end of the artificial blood vessel is fixed in the sandwich layer.

9. The vascular stent according to claim 8, wherein, The bare stent comprises a mesh tube structure formed by staggered weaving of at least one woven wire.

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