Support

Abstract

The utility model relates to a stent which is of a tubular structure and comprises a flexible area, a near-end supporting area and a far-end supporting area, and the near-end supporting area and the far-end supporting area are connected with the two ends of the flexible area respectively. The far-end end face of the far-end supporting area comprises an oblique opening structure which is formed by gradually extending towards the far-end direction from one side to the other side. The oblique opening structure is a non-flush structure suitable for bifurcated blood vessels, the oblique opening structure can set the inclination angle of the end face of the far end of the stent according to the situation of the intersection of the bifurcated blood vessels, so that the far end of the stent and the intersection of the blood vessels are completely attached and covered, the lesion position can be covered, and the main blood vessel cannot be protruded; the problem that after being implanted into a branch blood vessel, an intravascular stent cannot completely cover a lesion position or protrudes into a main blood vessel to affect side blood flow complications is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of intervention medical treatment, concretely relates to a stent. BACKGROUND

[0002] Interventional therapy is a new discipline combined with image diagnosis and clinical treatment in recent years, and has become a clinical three pillar disciplines with traditional internal medicine and surgery. Among them, the vascular stent is mainly aimed at cardiovascular diseases. For vascular stenosis or occlusive lesions, the vascular stent can be implanted to support and expand the diseased blood vessels, so that the blood flow of the diseased blood vessels is restored.

[0003] Generally, when the minimally invasive interventional therapy stenosis of the lesion blood vessel, a common vascular stent can be used to expand the blood vessel. However, in actual clinical practice, the vascular stenosis of many patients is located near the vascular bifurcation (i.e. at the origin of the side branch extending from the main branch), at this time the stent must completely cover the target lesion, and in some cases it should even exceed the lesion segment to reach the adjacent non-lesion or almost non-lesion vascular area, so as to fully utilize the potential of the stent for acute and subsequent vascular opening. For the above-mentioned vascular stenosis located near the bifurcation of the blood vessel, because the angle of the vascular bifurcation is not a right angle, if you want to completely cover the lesion site, the stent will have a protruding part in the main blood vessel when placed in any bifurcated blood vessel, and the single-sided stent will be suspended in the main blood vessel, which will be subjected to long-term erosion of the main blood flow or the blood flow of the opposite side branch, causing the instability of the stent. SUMMARY

[0004] In order to overcome the problems in the prior art, the utility model provides a stent.

[0005] The technical problem of the utility model is solved by providing a stent, the stent is of tubular structure, the stent comprises a flexible area, a proximal support area and a distal support area, the proximal support area and the distal support area are connected with the two ends of the flexible area respectively, and the distal end face of the distal support area comprises a beveled structure gradually extending from one side to the other side in the distal direction.

[0006] In some embodiments of the utility model, the distal support area comprises at least one closed loop wave coil and a plurality of open loop wave coils, the plurality of open loop wave coils are connected to the distal side of the at least one closed loop wave coil, the closed loop wave coil comprises a hollow closed loop structure formed by circumferentially connecting a plurality of diamond structures in head-tail mode, the open loop wave coil comprises a plurality of diamond structures connected with each other, and the first and last diamond structures in the circumferential direction of the open loop wave coil are separated from each other, and the adjacent two closed loop wave coils and / or open loop wave coils are arranged in interlaced mode.

[0007] In some embodiments of the utility model, the number of the diamond structure in the circumference of the open loop wave coil of the distal end support area gradually decreases from the proximal end to the distal end to form the beveled structure.

[0008] In some embodiments of the utility model, the flexible area is woven by braided wire, the flexible area comprises a plurality of flexible wave coils, the flexible wave coil comprises a wave crest and a wave trough, and the wave crest and the wave trough of two adjacent flexible wave coils are hookingly connected.

[0009] In some embodiments of the utility model, the flexible wave coil comprises a plurality of first wave coils and second wave coils, the distance between the wave crest and the wave trough of the first wave coil adjacent in the circumferential direction is smaller than the distance between the wave crest and the wave trough of the second wave coil adjacent in the circumferential direction and / or the distance between the wave crest and the wave trough of the first wave coil adjacent in the axial direction is smaller than the distance between the wave crest and the wave trough of the second wave coil adjacent in the axial direction, a plurality of the first wave coils are connected in the axial direction to form a support section, a plurality of the second wave coils are connected in the axial direction to form a flexible section, and the flexible section and the support section are connected.

[0010] In some embodiments of the utility model, the first wave coil comprises a third wave coil and a fourth wave coil, the third wave coil and the fourth wave coil are arranged in an overlapping manner, and the wave crest of the third wave coil corresponds to the wave trough of the fourth wave coil.

[0011] In some embodiments of the utility model, the distal end support area has a long side area with a relatively long length in the axial direction and a short side area with a relatively short length, the long side area and the short side area are arranged on opposite sides of the distal end support area, the distal end of the long side area extends in a direction away from the stent central axis to form a first flared portion, and the distal end of the short side area extends in a direction away from the stent central axis to form a second flared portion.

[0012] In some embodiments of the utility model, the outer surface of the first flared portion and / or the second flared portion is provided with a drag reduction structure.

[0013] In some embodiments of the utility model, the beveled structure extends in a direction away from the stent central axis to form a flared portion, and the outer surface of the flared portion is provided with a drag reduction structure.

[0014] In some embodiments of the utility model, the stent further comprises a first developing wire and a second developing wire, the first developing wire is arranged on the distal end side of the long side area and on the center line in the circumferential direction of the long side area, and the second developing wire is arranged on the distal end side of the short side area and on the center line in the circumferential direction of the short side area.

[0015] The utility model discloses a beneficial effect is: the bevel structure is the non -flush structure suitable for bifurcated blood vessel, the bevel structure can set the support far -end face inclination angle according to bifurcated blood vessel's cross situation, makes the support far -end and blood vessel cross place completely fit cover, can cover pathological change position again, can not protrude into the main stem blood vessel, avoided the blood vessel support implantation branch blood vessel after not being able to completely cover pathological change place or protruding into the main stem blood vessel influence contralateral blood flow causes complication problem. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the support flat spread structure schematic diagram provided by the utility model embodiment.

[0017] Figure 2 It is the far -end support area three -dimensional structure schematic diagram of support provided by the utility model embodiment.

[0018] Figure 3 It is the far -end support area three -dimensional structure schematic diagram of support provided by the utility model embodiment.

[0019] Figure 4 It is the structure schematic diagram of support in the blood vessel accurate release provided by the utility model embodiment.

[0020] Figure 5 It is the structure schematic diagram of support in the blood vessel not released to the position provided by the utility model embodiment.

[0021] Figure 6 It is the support flexible area flat spread structure schematic diagram provided by the utility model embodiment.

[0022] Figure 7 It is the support first wave circle flat spread structure schematic diagram provided by the utility model another embodiment.

[0023] Figure 8 It is the support flexible area and far -end support area and proximal end support area connection schematic diagram provided by the utility model embodiment.

[0024] Figure 9 It is the support flexible area and far -end support area and proximal end support area connection schematic diagram provided by the utility model another embodiment.

[0025] Figure 10 It is the support flexible area and far -end support area and proximal end support area connection schematic diagram provided by the utility model another embodiment.

[0026] The drawing mark explanation: 100, support; 1, distal end support area; 11, bevel structure; 12, diamond structure; 13, closed loop wave coil; 14, open loop wave coil; 15, long side area; 151, first flared portion; 16, short side area; 161, second flared portion; 17, drag reduction structure; 18, first developing wire; 19, second developing wire; 2, flexible area; 21, flexible wave coil; 211, wave crest; 212, wave trough; 213, first wave coil; 214, second wave coil; 23, support section; 24, flexible section; 2131, third wave coil; 2132, fourth wave coil; 3, proximal end support area; 4, steel sleeve. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are illustrated, it is to be understood that the present application is not limited to the exemplary embodiments described herein, but is applicable to any modifications, equivalents, or substitutes for these exemplary embodiments. Rather, these exemplary embodiments are provided to enable those skilled in the art to more completely and completely understand the present application, and to convey the full scope of the present application to those skilled in the art.

[0028] It is to be understood that the terms used herein are merely for the purpose of describing particular embodiments and are by no means to be taken as limiting unless otherwise defined in the context. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "includes" and / or "containing" when used herein, specify the presence of stated features, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described unless otherwise specifically noted. It is also to be understood that additional or alternative steps can be employed.

[0029] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to differentiate one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and the like, as well as other ordinal terms for describing various elements, components, regions, layers and / or sections, are used herein in a non-limiting and non-contingent manner. Thus, a first element, component, region, layer or section discussed below can be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0030] For ease of description, spatially relative terms can be used herein for the purpose of illustrating one element's or feature's relationship to another element or feature as shown in the figures. Such spatially relative terms include "internal", "external", "inward", "outward", "under", "below", "above", "on", "above", and the like. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device is inverted, then an element described as "below" or "beneath" another element or feature would then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0031] For the purpose of more clearly describing the structure of the present application, the terms "proximal end" and "distal end" are defined herein as terms commonly used in the field of interventional medicine. Specifically, "distal end" means the end that is far from the operator during the operation, "proximal end" means the end that is close to the operator during the operation, "axial direction" means the length direction, and "radial direction" means the direction perpendicular to the "axial direction".

[0032] Please refer to Figure 1 and Figure 2The utility model embodiment provides a kind of support 100, especially suitable for the vascular lesion near bifurcation of blood vessel, for example, iliac vein compression syndrome patient, the utility model takes vascular lesion at bifurcation of blood vessel as an example, detailed description is made.The support 100 is tubular structure, the support 100 includes distal end support area 1, flexible area 2 and proximal end support area 3, the proximal end support area 3 and distal end support area 1 are respectively connected with the two ends of the flexible area 2, the distal end face of the distal end support area 1 includes the bevel structure 11 formed by gradually extending in distal end direction from one side to another side.The proximal end support area 3 and distal end support area 1 have good supportability, to ensure the anchoring performance of the support 100, the flexible area 2 has good compliance, to ensure the compliance of the support 100 as a whole, guarantee that the support 100 can adapt to various blood vessel shapes.The bevel structure 11 is the non-level structure suitable for bifurcated blood vessel, the bevel structure 11 can set the distal end face of the support 100 inclination angle according to the cross situation of bifurcated blood vessel, so that the distal end of the support 100 completely fits and covers with blood vessel cross, both can cover lesion position, and also can not protrude into main stem blood vessel, avoid the problem that vascular stent is implanted into branch blood vessel and cannot completely cover lesion or protrude into main stem blood vessel and influence contralateral blood flow and cause complication.In the utility model embodiment, the angle a between the plane where the bevel structure 11 is located and the central axis of the support 100 is in the range of 25°-55°, because, if the angle of angle a is too small, then the distal end of the distal end support area 1 is insufficient, blood flow is easily rushed into the distal end support area 1 and blood vessel wall, to further cause the anchoring force of the support 100 is insufficient, thrombus is generated between the distal end support area 1 and blood vessel wall and other risks.In addition, if the angle of angle a is too large, then the support 100 can not completely cover lesion after being implanted into branch blood vessel, influence the treatment effect of the support 100.

[0033] Please refer to Figure 1 and Figure 2, the proximal support region 3 and the distal support region 1 comprise a plurality of diamond structures 12, the proximal support region 3 and the distal support region 1 comprise closed loop wave coils 13 enclosed by a plurality of the diamond structures 12 side by side; the distal support region 1 further comprises a plurality of open loop wave coils 14 connected in the circumferential direction by a plurality of the diamond structures 12, the first and last two diamond structures 12 in the circumferential direction of each open loop wave coil 14 are separated from each other; two adjacent closed loop wave coils 13 and / or open loop wave coils 14 are arranged staggered with each other. The closed loop wave coils 13 on the distal support region 1 are arranged on the proximal side of the open loop wave coils 14, the number of the diamond structures 12 in the circumferential direction of the open loop wave coils 14 gradually decreases from the proximal end to the distal end to form the beveled structure 11. Specifically, in the embodiments of the utility model, the distal support region 1 and the proximal support region 3 are cut from a nickel-titanium tube, that is, the distal support region 1 and the proximal support region 3 with a plurality of diamond structures 12, closed loop wave coils 13 and open loop wave coils 14 are formed by cutting a nickel-titanium tube. The distal support region 1 and the proximal support region 3 have strong support, thereby ensuring the support of the stent 100 at the proximal end and the distal end, and ensuring that the stent 100 can be stably anchored in the diseased blood vessel. On the distal support region 1, the closed loop wave coils 13 are arranged close to the proximal end, the open loop wave coils 14 are arranged close to the distal end, the number of the closed loop wave coils 13 is two, and two closed loop wave coils 13 are arranged side by side to ensure the basic support performance of the distal support region 1. The number of the diamond structures 12 in the circumferential direction of the open loop wave coil 14 gradually decreases from the proximal end to the distal end, that is, the open loop wave coil 14 has a plurality of the diamond structures 12, the closer to the closed loop wave coil 13, the more the open loop wave coil 14 has the diamond structures 12, thereby forming the beveled structure 11. In other embodiments of the utility model, the closed loop wave coil 13 and the open loop wave coil 14 can be separately manufactured, and then a plurality of closed loop wave coils 13 and open loop wave coils 14 are connected to each other to form the distal support region 1 and the proximal support region 3.

[0034] Further, please refer to Figure 2 and Figure 3Since the distal end face of the distal support region 1 is a beveled structure 11, the distal support region 1 has a long side region 15 with a relatively long length in the axial direction and a short side region 16 with a relatively short length, which are arranged on opposite sides of the distal support region 1. The distal end of the long side region 15 extends away from the central axis of the stent 100 to form a first flared portion 151. The distal end of the short side region 16 extends away from the central axis of the stent 100 to form a second flared portion 161. In the specific embodiments of the present application, the first flared portion 151 and the second flared portion 161 are arc-shaped structures, and the included angle between the first flared portion 151 and the second flared portion 161 and the central axis of the stent 100 is in the range of 5°-30°. The arrangement of the first flared portion 151 can enhance the fit of the stent 100 with the inner wall of the blood vessel, and is more in line with the anatomy of bifurcated blood vessels, so that the distal end of the stent 100 achieves good wall-adhesion effect. The second flared portion 161 can enhance the support and anchoring performance of the first flared portion 151. When the second flared portion 161 is anchored in the blood vessel, it will deform to adapt to the shape of the blood vessel, so that the second flared portion 161 deforms towards the central axis of the stent 100, thereby causing the distal end of the distal support region 1 to move towards the first flared portion 151 as a whole, thereby enhancing the anchoring force between the first flared portion 151 and the blood vessel wall, and ensuring that the first flared portion 151 can stably adhere to the blood vessel wall. At the same time, the included angle between the first flared portion 151 and the second flared portion 161 and the central axis of the stent 100 is set to be in the range of 5°-30°. This is because, if the angle is too small, the support and wall-adhesion performance of the distal support region 1 will be poor, and if the angle is too large, the stimulation to the blood vessel will be greater, which may cause secondary damage to the blood vessel. In other specific embodiments of the present application, the beveled structure 11 can be extended away from the central axis of the stent 100 to form a flared portion (not shown in the figure), so as to further increase the support and anchoring performance of the distal support region 1.

[0035] Please continue to read Figure 3When the stent 100 is loaded into a sheath, the first flared portion 151 and the second flared portion 161 will scratch the inner wall of the sheath, thus increasing the difficulty of loading the stent 100 into the sheath and easily scratching and damaging the inner wall of the sheath. When the stent 100 is released, the sheath needs to be moved proximally relative to the stent 100, so that the stent 100 is exposed to the sheath and released in the blood vessel. When the sheath is moved proximally relative to the stent 100, because the first flared portion 151 and the second flared portion 161 continuously abut against the inner wall of the sheath, the first flared portion 151 and the second flared portion 161 exert a greater force on the inner wall of the sheath, and the resistance of the stent 100 when released is greater. Moreover, the movement of the sheath can drive the stent 100 to move, thus affecting the release of the stent 100. Therefore, the stent 100 provided in the embodiments of the present application is provided with a drag reduction structure 17 on the first flared portion 151 and the second flared portion 161, so as to reduce the friction between the first flared portion 151 and the second flared portion 161 and the inner wall of the sheath, thus reducing the difficulty of loading the stent 100 into the sheath and avoiding scratching and damaging the inner wall of the sheath when the stent 100 is loaded into the sheath or released. At the same time, the movement of the sheath driving the stent 100 to move when the sheath is moved proximally to release the stent 100 can be avoided, thus avoiding affecting the release of the stent 100. In the embodiments of the present application, the drag reduction structure 17 is a film covering the first flared portion 151 and the second flared portion 161, and the material of the film is expanded polytetrafluoroethylene (ePTFE). The ePTFE has the characteristics of high strength-weight ratio, biocompatibility, high heat resistance, low friction, long-term stability and chemical inertness. In other embodiments of the present application, the drag reduction structure 17 can also be polyester fabric, which is sewn on the first flared portion 151 and the second flared portion 161 by sewing. A coating layer with increased lubricity and reduced friction can also be coated on the outer surface of the drag reduction structure 17, so as to further reduce the friction between the first flared portion 151 and the second flared portion 161 and the inner wall of the sheath. When the beveled structure 11 extends in the direction away from the central axis of the stent 100 to form a flared portion, the drag reduction structure 17 is arranged on the flared portion.

[0036] Please continue to read Figure 3The stent 100 further comprises a first developing wire 18 and a second developing wire 19. The first developing wire 18 is arranged at the distal end of the long side region 15 and on the center line in the circumferential direction of the long side region 15. The second developing wire 19 is arranged at the distal end of the short side region 16 and on the center line in the circumferential direction of the short side region 16. The first developing wire 18 is pre-bent by heat setting to form an arc similar to the first flared portion 151, and the second developing wire 19 is pre-bent by heat setting to form an arc similar to the second flared portion 161, thereby ensuring the arc shape of the first flared portion 151 and the second flared portion 161, avoiding deformation of the first flared portion 151 and the second flared portion 161 after compression release and other operations, and thereby ensuring the wall-adhesion performance of the stent 100. At the same time, the arrangement of the first developing wire 18 and the second developing wire 19 can ensure accurate release of the stent 100, facilitate identification of the direction of the stent 100, and thereby facilitate fast and accurate release of the stent 100. That is, when the first developing wire 18 and the second developing wire 19 adhere to the blood vessel wall and are located on opposite sides in the image, the release direction of the stent 100 is correct, as shown in Figure 4 If the first developing wire 18 and the second developing wire 19 do not adhere to the blood vessel wall and are deflected in the image, it indicates that the stent 100 is not released in place, as shown in Figure 5 In the specific embodiments of the present application, in order to ensure the developing effect of the first developing wire 18 and the second developing wire 19 and the effect of ensuring the arc shape of the first flared portion 151 and the second flared portion 161, the length of the first developing wire 18 and the second developing wire 19 in the axial direction ranges from 1 cm to 2 cm.

[0037] Please refer to Figure 6The support 100 is provided with the flexible area 2 which is woven by braided wires, the flexible area 2 comprises a plurality of flexible wave loops 21 which are formed by surrounding a circle in the shape of a sine wave by braided wires, the flexible wave loop 21 comprises a wave crest 211 and a wave trough 212. A plurality of the flexible wave loops 21 are connected with each other in the axial direction, the wave crest 211 and the wave trough 212 of two adjacent flexible wave loops 21 are hookingly connected with each other, thereby forming the flexible area 2. In order to balance the support property and the flexibility of the flexible area 2, the flexible wave loop 21 comprises a plurality of first wave loops 213 and second wave loops 214, the distance S1 between the wave crest 211 and the wave trough 212 which are adjacent in the circumferential direction of the first wave loop 213 is smaller than the distance S2 between the wave crest 211 and the wave trough 212 which are adjacent in the circumferential direction of the second wave loop 214, that is, the period of the first wave loop 213 is smaller than the period of the second wave loop 214. And / or the distance S3 between the wave crest 211 and the wave trough 212 which are adjacent in the axial direction of the first wave loop 213 is smaller than the distance S4 between the wave crest 211 and the wave trough 212 which are adjacent in the axial direction of the second wave loop 214, that is, the amplitude of the first wave loop 213 is smaller than the amplitude of the second wave loop 214. A plurality of the first wave loops 213 are connected with each other in the axial direction to form a support section 23, a plurality of the second wave loops 214 are connected with each other in the axial direction to form a flexible section 24, the flexible section 24 and the support section 23 are connected with each other to form the flexible area 2. It should be noted that the flexible area 2 which is formed by hooking a plurality of the flexible wave loops 21 has good flexibility. At the same time, in order to enhance the support property of the flexible area 2, so that the flexible area 2 balances the flexibility and the support property, the support section 23 is arranged, because the period and / or the amplitude of the first wave loop 213 is smaller, so that the support section 23 has better support property. And because the period and / or the amplitude of the second wave loop 214 is larger, so that the flexible section 24 has better flexibility.

[0038] In the embodiment of the utility model, the flexible section 24 and the support section 23 are arranged alternately in the axial direction, that is, one side of the flexible section 24 is connected with one side of the support section 23, the other side of the support section 231 is connected with one side of the other flexible section 24, and the same is true for the subsequent sections. Each support section 23 is formed by four first wave loops 213 being hooked to each other in the axial direction, and each flexible section 24 is formed by four second wave loops 214 being hooked to each other in the axial direction. The above arrangement ensures that the support property and the flexibility of the flexible region 2 are more uniform, and avoids the support property or the flexibility of the stent 100 in a certain region being too large, thereby affecting the ability of the stent 100 to adapt to the shape of the blood vessel or affecting the anchoring ability of the stent 100. In other embodiments of the utility model, the structure of the flexible region 2 can be adjusted according to actual needs, for example, the flexible section 24 or the support section 23 can be omitted, and the flexible region 2 as a whole is formed by one of the flexible section 24 or the support section 23. Or two flexible sections 24 are connected with each other and connected with a support section 23, and the support section 23 is further connected with two other flexible sections 24 connected with each other.

[0039] Further, please refer to Figure 7 To further enhance the support property of the flexible region 2 while trying not to affect the flexibility of the flexible region 2 as a whole, the first wave loop 213 can include a third wave loop 2131 and a fourth wave loop 2132, the third wave loop 2131 and the fourth wave loop 2132 are arranged in overlap, and the wave crest 211 of the third wave loop 2131 corresponds to the wave trough 212 of the fourth wave loop 2132, that is, the third wave loop 2131 and the fourth wave loop 2132 are arranged in staggered peaks. Through the above arrangement, the support property of the first wave loop 213 can be further enhanced, thereby increasing the support property of the support section 23. In the embodiment of the utility model, the period and the amplitude of the third wave loop 2131 and the fourth wave loop 2132 are the same, that is, the third wave loop 2131 and the fourth wave loop 2132 are the same wave loop, to ensure that the support section 23 is uniformly stressed as a whole. In other embodiments of the utility model, the period and the amplitude of the third wave loop 2131 and the fourth wave loop 2132 can be adjusted adaptively according to actual needs.

[0040] The connection mode between the flexible region 2 and the distal support region 1 and the proximal support region 3 can be various, in the embodiment of the utility model, the flexible region 2 and the distal support region 1 and the proximal support region 3 can be connected through a steel sleeve 4, that is, one end of the steel sleeve 4 is connected with the flexible region 2, the other end is connected with the distal support region 1 or the proximal support region 3, such as Figure 8The flexible region 2 and the distal support region 1 and the proximal support region 3 can also be connected by hooking, that is, the wave crest 211 or the wave trough 212 in the flexible region 2 is hooked with the distal support region 1 or the proximal support region 3, realizing the connection of the flexible region 2 and the distal support region 1 and the proximal support region 3, as shown in Figure 9 The flexible region 2 and the distal support region 1 and the proximal support region 3 can also be connected by hooking, that is, the wave crest 211 or the wave trough 212 in the flexible region 2 is hooked with the distal support region 1 or the proximal support region 3, realizing the connection of the flexible region 2 and the distal support region 1 and the proximal support region 3, as shown in Figure 10

[0041] Compared with the prior art, the support has the following advantages: the beveled structure is a non-level structure suitable for bifurcated blood vessels, the beveled structure can set the inclination angle of the distal end face of the support according to the intersection condition of the bifurcated blood vessels, so that the distal end of the support completely covers the intersection of the blood vessels, can cover the lesion position, and can not protrude into the main blood vessel, thereby avoiding the problem that the bifurcated blood vessel cannot completely cover the lesion position or protrude into the main blood vessel after the blood vessel support is implanted, affecting the contralateral blood flow and causing complications.

[0042] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the principle of the utility model should be included in the protection scope of the utility model.​

Claims

1. A stent, said stent being a tubular structure, characterized in that: The stent comprises a flexible region, a proximal support region and a distal support region, the proximal support region and the distal support region are connected with two ends of the flexible region respectively, and a distal end surface of the distal support region comprises a beveled structure gradually extending from one side to the other side in a distal direction.

2. The stent of claim 1, wherein: The distal support region comprises at least one closed loop wave coil and a plurality of open loop wave coils, the plurality of open loop wave coils are connected to a distal side of the at least one closed loop wave coil, the closed loop wave coil comprises a hollow closed loop structure formed by a plurality of diamond structures connected in a circumferential direction, the open loop wave coil comprises a plurality of diamond structures connected in series, and the first and last diamond structures in the circumferential direction of the open loop wave coil are separated from each other, and adjacent two closed loop wave coils and / or open loop wave coils are arranged in a staggered manner.

3. A stent as in claim 2, wherein: The number of diamond structures in the circumferential direction of the plurality of open loop wave coils of the distal support region gradually decreases from proximal to distal to form the beveled structure.

4. The stent defined in Claim 2, wherein: The flexible region is woven by woven wires, and the flexible region comprises a plurality of flexible wave coils, the flexible wave coil comprises a wave crest and a wave trough, and the wave crest and the wave trough of adjacent two flexible wave coils are hookingly connected.

5. A stent as in claim 4, wherein: The flexible wave coil comprises a plurality of first wave coils and second wave coils, the distance between the wave crest and the wave trough in the circumferential direction of the first wave coil is smaller than the distance between the wave crest and the wave trough in the circumferential direction of the second wave coil and / or the distance between the wave crest and the wave trough in the axial direction of the first wave coil is smaller than the distance between the wave crest and the wave trough in the axial direction of the second wave coil, a plurality of the first wave coils are connected in the axial direction to form a support section, a plurality of the second wave coils are connected in the axial direction to form a flexible section, and the flexible section and the support section are connected with each other.

6. A stent as in claim 5, wherein: The first wave coil comprises a third wave coil and a fourth wave coil, the third wave coil and the fourth wave coil are arranged in an overlapping manner, and the wave crest of the third wave coil corresponds to the wave trough of the fourth wave coil.

7. The stent of claim 1, wherein: The distal support region has a long side region with a relatively long length in the axial direction and a short side region with a relatively short length, the long side region and the short side region are arranged on opposite sides of the distal support region, a distal end of the long side region extends in a direction away from the center axis of the stent to form a first flared portion, and a distal end of the short side region extends in a direction away from the center axis of the stent to form a second flared portion.

8. A stent as in claim 7, wherein: An outer surface of the first flared portion and / or the second flared portion is provided with a drag reduction structure.

9. The stent of claim 1, wherein: The beveled structure extends in a direction away from the center axis of the stent to form a flared portion, and an outer surface of the flared portion is provided with a drag reduction structure.

10. The stent defined in Claim 7, wherein: The stent further comprises a first developing wire and a second developing wire, the first developing wire is arranged on a distal side of the long side region and on a center line in a circumferential direction of the long side region, and the second developing wire is arranged on a distal side of the short side region and on a center line in a circumferential direction of the short side region.

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