CN116407330A - Lumen stent - Google Patents

Abstract

The present invention relates to a lumen stent. The lumen stent comprises a tubular main body and a coating, wherein the tubular main body comprises an inner framework and an outer framework, the coating is arranged on the inner framework, the outer framework is sleeved on the inner hanging frame, and the outer framework is used for forming a protective layer on the outer side of the coating. Therefore, the outer framework is sleeved on the inner framework, so that the outer framework is positioned at the outer side of the tectorial membrane, and when the main support rubs with the lumen support, the outer framework can form a barrier at the outer side of the tectorial membrane to prevent the friction between the main support and the tectorial membrane, thereby realizing the protection of the tectorial membrane.

Description

Lumen stent

Technical Field

The invention relates to the field of medical instruments, in particular to a lumen stent.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

The aortic aneurysm endoluminal repair (Endovascular aortic repair. EVAR) has been widely used in clinic due to the advantages of simple operation, small trauma, short operation time, etc., and has become an important means for treating aortic dissection.

As shown in fig. 1, when aortic dissection occurs in the aortic arch, in order to secure blood circulation of the aortic arch and three branch vessels on the arch on the basis of isolating a lesion site, the above effect is generally achieved by adopting a manner that a main stent 700 and a branch stent 100 are matched, however, the main stent 700 and the branch stent 100 are caused to slightly shake under the repeated action of periodical pulsating pressure of blood, so that the side walls of the main stent 700 and the branch stent 100 are rubbed against each other to cause rupture of a coating and internal leakage.

Disclosure of Invention

Based on this, it is necessary to provide a lumen stent comprising a tubular main body and a coating film, the tubular main body comprising an inner skeleton and an outer skeleton, the coating film being disposed on the inner skeleton, the outer skeleton being sleeved on the inner hanger, the outer skeleton being for forming a protective layer on the outer side of the coating film.

Optionally, the exoskeleton is a reticular structure, the exoskeleton includes a first side wall and a second side wall, when the exoskeleton is in a natural state, a minimum mesh area on the first side wall is smaller than a minimum mesh area on the second side wall, when the exoskeleton is in a curved state, the first side wall is a large curved side, and the second side wall is a small curved side.

Optionally, the second side wall is connected to the inner skeleton, and at least one portion of the first side wall is suspended to form a free end.

Optionally, the outer skeleton is formed by knitting of knitting yarn, and the knitting yarn on the first lateral wall is mutually hooked, and the knitting yarn on the second lateral wall forms two adjacent wave crests and wave troughs mutually noninterfere in the axial direction.

Optionally, the inner skeleton comprises a first section, a second section and a third section which are sequentially connected, the second section is located between the first section and the third section, the flexibility of the second section is larger than that of the first section and the third section, and the outer skeleton covers the second section.

Optionally, the second section includes a plurality of wavy rings disposed at intervals along an axial direction of the second section.

Optionally, the wavy rings include peaks and valleys, the peaks on two axially adjacent wavy rings being on the same line, and the valleys on two axially adjacent wavy rings being on the same line.

Optionally, the exoskeleton is formed by braiding of braided filaments, and the intersection points of the braided filaments on the exoskeleton are located between two axially adjacent wavy loops on the second section.

Optionally, the first section, the outer skeleton and the third section are integrally woven, and the outer diameters of the first section and the third section are smaller than the outer diameter of the outer skeleton.

Optionally, the lumen stent further comprises two developing structures, and the two developing structures are respectively arranged at two ends of the second section.

The invention also provides a bracket system, which comprises the lumen bracket and also comprises a main bracket, wherein the main bracket is provided with a through hole, and the lumen bracket is inserted into the through hole and is at least partially positioned at the outer side of the main bracket.

Compared with the prior art, the lumen stent and the stent system have the beneficial effects that:

according to the invention, the inner framework and the coating are matched to form a sealing channel through the coating on the inner framework, the outer framework is sleeved on the inner framework, the outer framework is positioned on the outer side of the coating, when the main support and the lumen support are rubbed, especially at the gap between two adjacent wavy annular objects, the coating is easy to damage due to the fact that the coating is not supported in the gap, and at the moment, the outer framework can form a barrier on the outer side of the coating to prevent the friction between the main support and the coating, so that the protection of the coating is realized.

Drawings

FIG. 1 is a schematic view of the prior art of the co-operation of a main stent with a branch stent in a vessel;

FIG. 2 is a schematic view showing the structure of a lumen stent according to a first embodiment of the present invention;

FIG. 3 is a schematic view of an exploded structure of a lumen stent according to a first embodiment of the present invention;

FIG. 4 is another schematic structural view of a lumen stent according to a first embodiment of the present invention;

FIG. 5 is an exploded view of an inner frame and an outer frame in a mesh structure according to a first embodiment of the present invention;

FIG. 6 is a schematic structural view of a lumen stent according to a second embodiment of the present invention;

FIG. 7 is an exploded view of a lumen stent according to a second embodiment of the present invention;

FIG. 8 is a schematic view showing the expanded structures of the first section, the exoskeleton and the third section in the second embodiment of the present invention;

FIG. 9 is a schematic view showing an expanded structure of an exoskeleton in a second embodiment of the present invention;

fig. 10 is a schematic structural view of an exoskeleton in a bent state according to a second embodiment of the present invention;

FIG. 11 is a diagram showing the deformation of the mesh on the second sidewall in the second embodiment of the present invention;

FIG. 12 is a diagram showing deformation of a mesh on a first sidewall in a second embodiment of the invention;

FIG. 13 is an enlarged schematic view of the structure A in FIG. 8 according to the present invention;

FIG. 14 is an enlarged schematic view of the structure of FIG. 9B in accordance with the present invention;

FIG. 15 is an enlarged schematic view of the structure of FIG. 9 at C in accordance with the present invention;

FIG. 16 is an expanded view of the second embodiment of the present invention after the cover is attached to the tubular body;

fig. 17 is a schematic structural view of an inner skeleton in a third embodiment of the present invention;

fig. 18 is a schematic diagram of a mating structure of a lumen stent and a main stent according to a fourth embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.

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

Example 1

The present embodiment provides a lumen stent, as shown in fig. 2 and 3, which includes a tubular main body and a coating 130, the tubular main body includes an inner skeleton 110 and an outer skeleton 120 sleeved on the inner skeleton 110, the coating 130 is disposed on the inner skeleton 110, and the outer skeleton 120 is used for forming a protective layer on the outer side of the coating 130.

It should be noted that the lumen stent in this embodiment can be used for active pulsating intra-luminal treatment of aortic aneurysms and treatment of thoracoabdominal aortic aneurysms. Specifically, the lumen stent in this embodiment may be used as a branch stent in a chimney technique, for example, in one embodiment, the lumen stent is disposed in parallel with the main stent in an arterial lumen, and an end of the lumen stent away from the arterial lumen is in communication with a branch vessel. In another implementation, the luminal stent can also be used as a branch stent in an in situ fenestration technique. In other embodiments, the lumen stent may be in any scenario where multiple stents are desired to be used in combination.

As shown in fig. 2 and 3, the tubular main body includes an inner skeleton 110 and an outer skeleton 120, and the outer skeleton 120 is sleeved on the inner skeleton 110. The outer frame 120 and the inner frame 110 may be hooked, adhered, or connected to each other through the cover 130. The coating 130 is coated on the inner skeleton 110 to form a lumen structure, so that the inner skeleton 110 and the coating 130 cooperate to form a sealing channel. It is understood that in one embodiment, the cover 130 may also be coated on the exoskeleton 120. It is understood that in another embodiment, in the released state, the inner diameter d1 of the exoskeleton 120 is greater than the outer diameter d2 of the inner skeleton 110. In other embodiments, the inner diameter d1 of the outer skeleton 120 may be equal to or smaller than the outer diameter d2 of the inner skeleton 110, i.e., the outer skeleton 120 may have a certain deformability to fit over the inner skeleton 110.

The material of the cover 130 may be a degradable material or a non-degradable material. For example, the material of the cover film 130 may be Polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polyurethane (PU), or polylactic acid (PLA), or the like.

In this embodiment, as shown in fig. 3, the inner skeleton 110 includes a plurality of wavy annular objects 111, the wavy annular objects 111 are disposed at intervals along the axial direction of the inner skeleton 110, and the coating film 130 is coated on the wavy annular objects 111 to connect two adjacent wavy annular objects 111.

In this embodiment, as shown in fig. 2 and 3, the outer frame 120 is a mesh structure and is formed by weaving woven wires, the outer frame 120 is located outside the inner frame 110, and both axial ends of the outer frame 120 are connected to the wavy annular object 111 on the inner frame 110, for example, in one embodiment, both axial ends of the outer frame 120 are bonded to the covering film 130 through the connecting film 131, thereby connecting the outer frame 120 and the inner frame 110. It will be appreciated that in another embodiment, the peaks of the wavy annular objects 111 on the axial ends of the inner skeleton 110 are exposed, and the outer skeleton 120 is hooked on the exposed peaks. It will be appreciated that in other embodiments, the cover 130 includes an inner cover and an outer cover, the inner cover is connected to the inner side wall of the inner frame 110, the outer cover is connected to the outer side wall of the inner frame 110, a notch is formed in the outer cover, and the outer frame 120 is connected to the wavy annular object 111 through the notch.

The advantage of this arrangement is that the outer frame 120 is positioned outside the membrane 130 by the outer frame 120 being sleeved on the inner frame 110, when the main frame 700 rubs against the lumen stent, especially at the gap between two adjacent wavy rings 111, the membrane 130 is easily damaged by the friction of the main frame 700 in this region because the membrane 130 is not supported, at this time, the outer frame 120 can form a barrier outside the membrane 130 to prevent the friction between the main frame 700 and the membrane 130, thereby realizing protection of the membrane 130.

It will be appreciated that in another embodiment, as shown in fig. 4, the inner frame 210 may be formed by cutting metal, the inner frame 210 is in a spiral spring structure, the outer frame 220 is formed by weaving wires to form a net structure, the outer frame 220 is connected to the inner frame 210 through a connecting film 231, and the covering film 230 is coated on the inner frame 210.

It will be appreciated that in other embodiments, as shown in fig. 5, the inner frame 320 includes at least one woven wire, the woven wire is woven to form a mesh structure, the cover 330 is wrapped on the inner frame 320, the outer frame 310 is in a mesh structure, the outer frame 310 is sleeved on the inner frame 320, and the outer frame 310 is connected with the inner frame 320.

Example two

The difference between this example and the first embodiment is that, as shown in fig. 6 to 9, the exoskeleton 420 has a mesh structure, the exoskeleton 420 includes a first side wall 421 and a second side wall 422, when the exoskeleton 420 is in a curved state, the first side wall 421 is a large curved side 140, and the second side wall 422 is a small curved side 150, and when the exoskeleton 420 is in a natural state, the area S1 of the smallest mesh on the first side wall 421 is smaller than the area S2 of the smallest mesh on the second side wall 422.

In the present embodiment, as shown in fig. 7, the inner skeleton 410 includes a first segment 411, a second segment 412, and a third segment 413; wherein the first section 411, the third section 413 and the outer skeleton 420 are integrally woven by woven wires to form a mesh structure, and the second section 412 includes a plurality of wavy rings 4121 axially spaced along the inner skeleton 410.

In this embodiment, as shown in fig. 7, the outer frame 420 is formed by weaving a mesh structure with woven wires, the woven wires may be hooked with each other, or may be merely intersected and overlapped with each other, and the mesh on the outer frame 420 refers to a mesh formed by intersecting a plurality of woven wires. The exoskeleton 420 includes a bent state and a natural state, in which the exoskeleton 420 is in a vertical tubular structure, the first sidewall 421 and the second sidewall 422 are disposed opposite to each other, and the first sidewall 421 and the second sidewall 422 may be disposed at intervals along the circumferential direction of the exoskeleton 420 or may be continuous in the circumferential direction, as shown in the expanded view of the exoskeleton 420 in fig. 8 and 9, the mesh size (i.e., the mesh area S1) of the smallest mesh on the first sidewall 421 is smaller than the mesh size (i.e., the mesh area S2) of the smallest mesh on the second sidewall 422, and specifically, the ratio of the mesh area S1 on the first sidewall 421 to the mesh area S2 on the second sidewall 422 is: 1.5 to 4, in particular, the ratio may be: 1.5, 2, 3 or 4. As shown in fig. 10, in the bent state, the exoskeleton 420 has an arc-shaped tubular structure, and at this time, the exoskeleton 420 includes a large curved side 140 and a small curved side 150, the first sidewall 421 is located on the large curved side 140, and the second sidewall 422 is located on the small curved side 150.

It should be noted that, referring back to fig. 1 and 10, one end of the branch stent 100 is inserted into the main stent 700, the other end of the branch stent 100 is inserted into the branch vessel, and the middle section of the branch stent 100 presents a larger bending angle. At this time, as shown in fig. 11 (the solid line part is a mesh schematic diagram of the second sidewall 422 in the vertical state, the dotted line part is a mesh state schematic diagram of the deformed second sidewall 422), on the small curved side 150 of the lumen stent, the braided wires on the exoskeleton 120 move toward each other to overlap each other, so that the mesh area is reduced, and thus the braided wires at the small curved side 150 are denser; as shown in fig. 12 (the solid line part is a mesh schematic view of the first sidewall 421 in the vertical state, and the dotted line part is a mesh schematic view of the deformed first sidewall 421) on the large curved side 140 of the branch stent 100, the braided wires on the outer frame 120 move back to make the braided wires on the large curved side 140 sparse, and at this time, the large curved side 140 forms a large area of mesh, and in the case of bending, the coating 130 is easily attached to the mesh on the large curved side 140 under the self elastic force, so that the coating 130 on the large curved side 140 is easily damaged by friction of the main stent 700.

The advantage of this arrangement is that in the curved state, the first side wall 421 is located at the large curved side 140, and the woven wires on the first side wall 421 move back to back under traction at both ends of the inner skeleton 410, so that the mesh area on the first side wall 421 becomes larger, and by setting that the mesh area on the first side wall 421 is larger than the mesh area on the second side wall 422 in the natural state, the mesh area on the first side wall 421 still has enough woven wire density after being enlarged to form a barrier at the outer side of the covering film 430, thereby ensuring protection of the covering film 430 at the large curved side 140; the second side wall 422 is located at the small curve side 150, and the knitting wires on the second side wall 422 move toward each other under the extrusion of both ends of the inner frame 410, so that the mesh area on the second side wall 422 is reduced, and at this time, even if the mesh area on the second side wall 422 is larger than the mesh area on the first side wall 421 in a natural state, the outer frame 420 can maintain a sufficient knitting wire density to achieve protection of the covering film 430 of the small curve side 150.

Further, in the bent state, in order to ensure a certain gap between the large bent side 140 of the outer frame 420 and the cover film 430, as shown in fig. 11 to 13, the second side wall 422 is connected to the inner frame 410, and at least one portion of the first side wall 421 is suspended to form a free end.

In this embodiment, please continue to refer to fig. 11 and 13, two ends of the outer skeleton 420 are respectively connected to the first section 411 and the third section 413, a distance is provided between two ends of the first side wall 421 and the covering film 430, and the outer skeleton 420 is suspended outside the inner skeleton 410 to form a free end, where the free end refers to that two ends of the first side wall 421 are not constrained by the inner skeleton 410 or the covering film 430, for example, in this embodiment, two ends of the first side wall 421 are not connected to the first section 411 and the third section 413, so that the force transmission effect between the first side wall 421 and the inner skeleton 410 is interrupted or weakened at two ends of the first side wall 421.

It should be noted that, at the first side wall 421, the mesh area is smaller, and the woven wires are denser, so that the deformation resistance of the first side wall 421 is greater than that of the second side wall 422, and when the middle section of the inner frame 410 is bent, the first side wall 421 will pull the inner frame 410, increasing the bending difficulty of the inner frame 410, and reducing the deformation performance of the inner frame 410. The deformability refers to the ease of bending the inner frame 410, and the better the deformability is, the easier the inner frame 410 is to bend, and the worse the deformability is, the harder the inner frame 410 is to bend.

Thus, the connection between the outer skeleton 420 and the inner skeleton 410 is achieved by connecting the second side wall 422 with the inner skeleton 410, and at least one end of the first side wall 421 is suspended to form a free end, so that the force transmission between the first side wall 421 and the inner skeleton 410 is broken or weakened at the two ends of the first side wall 421, on one hand, the interference of the first side wall 421 on the bending deformation of the inner skeleton 410 is weakened, and the flexibility of the inner skeleton 410 is increased; on the other hand, when the inner frame 410 is bent and deformed, the first side wall 421 is weak in the pulling action of the inner frame 410, so that the bending degree of the first side wall 421 is smaller than that of the inner frame 410, a certain gap is formed between the first side wall 421 and the coating film 430, a space for the first side wall 421 to be pressed and deformed is formed, and the probability of the main support 700 contacting the coating film 430 is reduced.

Further, in order to avoid excessive pulling of the inner frame 410 by the first side wall 421, the outer frame 420 is formed by knitting the knitting yarns, as shown in fig. 9, 14 and 15, the knitting yarns on the first side wall 421 are hooked, and the axially adjacent peaks and valleys formed by the knitting yarns on the second side wall 422 do not interfere with each other.

In this embodiment, the outer skeleton 420 includes first braided wires and second braided wires, the first braided wires are woven and then heat-set to form a first wave structure 423, the second braided wires are woven and then heat-set to form a second wave structure 424, the first wave structure 423 includes a first wave trough 4231, the second wave structure 424 includes a second wave crest 4241, as shown in fig. 14, in the area of the first side wall 421, the braided wires at the second wave crest 4241 pass through from the inner side of the first wave trough 4231 and then turn over towards the outer side of the second wave crest 4241 to achieve mutual hooking of the braided wires; as shown in fig. 15, in the region where the second side wall 422 is located, the second crest 4241 is located inside or outside the first trough 4231, the second crest 4241 is attached to the first trough 4231, and the second crest 4241 does not interfere with the first trough 4231.

In another embodiment, the second wave crest 4241 is wound around the first wave crest 4231 for a plurality of turns when passing over the first wave crest 4231 in the area where the first side wall 421 is located, so as to increase the connection stability between the first wave crest 4231 and the second wave crest 4241. In other embodiments, the highest point of the second crest 4241 is welded to the lowest point of the first trough 4231 in the region where the first sidewall 421 is located.

The advantage of this arrangement is that when the outer skeleton 420 follows the bending deformation of the inner skeleton 410, the first side wall 421 is located at the large bending side 140, the braided wires on the first side wall 421 move back to back under the traction of the two ends of the inner skeleton 410, when the braided wires move back to a certain distance, the braided wires are mutually hooked through the arrangement of the braided wires on the first side wall 421 to limit the displacement of the braided wires in back to back movement, so that the limit mesh area of the first side wall 421 in the bending state is restrained, the exposure of the covering film 430 caused by the overlarge mesh area of the first side wall 421 in the bending state is avoided, and the protection effect of the outer skeleton 420 on the covering film 430 is weakened.

Further, as shown in fig. 6 and 7, the inner skeleton 410 includes a first section 411, a second section 412 and a third section 413, the second section 412 has a flexibility greater than that of the first section 411 and the third section 413, and the outer skeleton 420 is located at least outside the second section 412.

As shown in fig. 7, the second section 412 includes a plurality of wavy rings 4121, and the plurality of wavy rings 4121 are disposed at intervals along the axial direction of the second section 412. In the natural state, the axes of all the wavy rings 4121 are on the same line as the axes of the first and third sections 411, 413. The adjacent two wavy rings 4121 have a spacing distance therebetween, and illustratively, the wavy rings 4121 include a first wavy ring 4121a and a second wavy ring 4121b, the first wavy ring 4121a includes a first end surface, the first end surface is located at one end of the first wavy ring 4121a near the second wavy ring 4121b, the second wavy ring 4121b includes a second end surface, the second end surface is located at one end of the second wavy ring 4121b near the first wavy ring 4121a, a spacing distance d3 is provided between the first end surface and the second end surface, and the spacing distance d3 is: -3-5 mm; specifically, the separation distance d3 may be-3, -1, 0, 2, or 5mm. .

In this embodiment, as shown in fig. 11, the first section 411, the third section 413 and the outer skeleton 420 are integrally formed by braiding braided wires, the first section 411, the third section 413 and the outer skeleton 420 are integrally in a net structure, the first section 411 and the third section 413 are respectively located at two axial ends of the outer skeleton 420, the inner diameters of the first section 411 and the third section 413 are smaller than the inner diameter of the outer skeleton 420, the mesh areas on the first section 411 and the third section 413 can be the same or different, and in a natural state, the axes of the first section 411, the third section 413 and the outer skeleton 420 are located on the same straight line.

As shown in fig. 16, the coating 430 includes an inner coating 431 and an outer coating 432, and the inner coating 430 is located inside the first, second and third sections 411, 412 and 413 and covers inner sidewalls of the first, second and third sections 411, 412 and 413, so that the inner frame 410 forms a sealed channel. The outer coating 432 includes a first outer coating 4321, a second outer coating 4322, and a third outer coating 4323, where the first outer coating 4321 covers the outer sidewall of the first section 411, the second outer coating 4322 covers the outer sidewall of the second section 412, the third outer coating 4323 covers the outer sidewall of the third section 413, and when the outer coating 430 covers the first section 411, the second section 412, and the third section 413, the outer skeleton 420 is located on the outer sidewall of the second outer coating 4322, so as to protect the second outer coating 4322.

Therefore, when the inner frame 410 is bent, the second section 412 includes a plurality of wavy rings 4121, and the wavy rings 4121 are spaced apart, so that the wavy rings 4121 do not interfere with each other, and the second section 412 is easier to bend, so that the flexibility is better, and the better circular lumen can be maintained in the bending state, thereby ensuring the smoothness of blood.

It should be appreciated that the method of testing the compliance of the endoskeleton 410 may be in accordance with YY/T0663.2-2016, "second portion of cardiovascular implant intravascular device: the bending/crimping of the d.5.3.6 portions of annex D in vascular stents. For example, in one embodiment, a lumen stent is placed into a straight tube, the straight tube carrying the stent is placed on a cylindrical caliper gauge, and the orientation of the stent is tested in the worst case; the catheter loaded with the stent is wound on the gauge, so that the whole length of the stent can be released from the gauge or bent for 180 DEG at maximum; recording the radius, and if severe stenosis is observed; removing the force exerted on the stent, and recording whether the stent can be restored to the original geometric administration; the gauge radius is gradually reduced and the radius and occurrence of severe downloads are repeatedly recorded until there is a discount or the stent diameter is reduced by 50%.

Further, referring to fig. 16 again, the first outer film 4321, the second outer film 4322 and the third outer film 4323 are disposed at intervals.

The first outer coating 4321 covers the outer side wall of the first section 411, a distance is provided between the first outer coating 4321 and the second outer coating 4322 to separate the outer coating 432 at the connection between the first section 411 and the second section 412, a distance is provided between the second outer coating 4322 and the third outer coating 4323 to separate the outer coating at the connection between the third section 413 and the second section 412. Thus, the first outer coating 4321 and the second outer coating 4322 are provided at a distance from each other, so that a gap is provided between the first outer coating 4321 and the second outer coating 4322, and the second outer coating 4322 and the third outer coating 4323 are provided at a distance from each other, so that a gap is provided between the second outer coating 4322 and the third outer coating 4323, thereby avoiding the outer coating 432 from covering the outer frame 420 and increasing the flexibility of the outer frame 420.

Further, to facilitate compression of the luminal stent into the delivery device, as shown in fig. 16, the intersection points p of the braided filaments on the exoskeleton 420 are located between adjacent two wavy rings 4121. For example, in one embodiment, a plurality of wavy rings 4121 are provided at intervals, and an accommodating space for the intersection point p of the knitting yarn is formed between two adjacent wavy rings 4121.

Therefore, when the lumen stent needs to be compressed into the delivery device to be delivered to the target position through the blood vessel, the intersection point p of the braided wires on the outer skeleton 420 is located between the two adjacent wavy rings 4121, so that the accommodating space of the intersection point p of the braided wires can be formed between the two adjacent wavy rings 4121, thereby maximally utilizing the space on the second section 4121 and reducing the difficulty of the lumen stent being compressed into the delivery device.

Further, in order to facilitate the staff to identify the position of the bending section, referring to fig. 6 and 7 again, the lumen stent further includes a plurality of developing structures 440, and the plurality of developing structures 440 are disposed at two axial ends of the second section 412 respectively. It should be noted that, the developing structure 440 is made of a developing material, which may be a good developing material such as tantalum, platinum, gold, etc., and the developing structure 440 includes a developing filament wound around the wavy rings 4121 at two axial ends of the second section 412. In other embodiments, the wavy rings 4121 on both ends of the second section 412 have the developing material welded thereto. Thus, by providing the development structures 440 at both axial ends of the second section 412, the position of the exoskeleton 420 can be identified during release of the stent, facilitating the staff to identify where it is more suitable to mate with other stents.

Thus, when the lumen stent is used in cooperation with the main stent 700, bending usually occurs at the second section 412, and the region which is usually rubbed with the main stent 700 also occurs at the second section 412, so that the second section 412 can still keep a better round lumen in a bending state through the arrangement of the second section 412 with higher flexibility, the smoothness of blood is ensured, and the outer framework 420 is only covered on the middle section 412 through the arrangement that the outer framework 420 does not need to entirely cover the inner framework 410, thereby reducing the coverage area of the outer framework 420 and reducing the difficulty of the lumen stent to be compressed and loaded into a conveying device.

In other embodiments, as shown in fig. 17, each of the first section 511, the second section 512 and the third section 513 includes a plurality of wavy loops disposed at intervals, wherein the wavy phases of two adjacent wavy loops on the first section 511 and the third section 513 are opposite, and the wavy phases of two adjacent wavy loops on the second section 512 are the same. For example, in one embodiment, the second segment 512 comprises a first wavy annulus comprising a first peak 5121 and a first trough 5122 and a second wavy annulus comprising a second peak 5123 and a second trough 5124, the first peak 5121 and the second peak 5123 being on the same vertical line and the first trough 5122 and the second trough 5124 being on the same vertical line, such that the wavy phases of two adjacent wavy annuli on the second segment 512 are the same. The first segment 511 includes a third wavy annulus including a third crest 5111 and a third trough 5112, and a fourth wavy annulus including a fourth crest 5113 and a fourth trough 5114, the third crest 5111 and the fourth trough 5114 being oppositely disposed, and the third crest 5112 trough and the fourth crest 5113 being oppositely disposed, such that the adjacent two wavy annuli on the first segment 511 are opposite in waveform phase. The third section 513 includes a fifth wavy ring and a sixth wavy ring, the fifth wavy ring includes a fifth crest 5131 and a fifth trough 5132, the sixth wavy ring includes a sixth crest 5133 and a sixth trough 5134, the fifth crest 5131 and the sixth trough 5134 are disposed opposite to each other, and the fifth trough 5132 and the sixth crest 5133 are disposed opposite to each other, so that the adjacent two wavy rings on the third section 513 are opposite in waveform phase. Therefore, the waveform phases of the waveform loops on the second section 512 are the same, so that a larger gap is formed between the two adjacent waveform loops, and a certain displacement space is provided for the two adjacent waveform loops, so that the second section 512 has better flexibility, and when the inner skeleton 510 is bent, the two adjacent waveform loops interfere with each other through the arrangement of the waveform phases of the two adjacent waveform loops on the first section 511 and the third section 513, so that the first section 511 and the third section 513 have better bending resistance.

Example IV

The present embodiment provides a stent system, as shown in fig. 18, which comprises a lumen stent 600 and a main stent 800 as described above, wherein the main stent 600 is arranged in parallel with the lumen stent 800, one end of the lumen stent 600 is bent towards a branch vessel, and an outer skeleton is at least partially attached to the outer side wall of the main stent, so that the outer skeleton can reduce or eliminate the friction force between the main stent and the coating, thereby realizing the protection of the coating, preventing the coating from being broken under the friction of the main stent, and causing internal leakage

In another embodiment, the main support 800 is provided with a through hole, and the lumen support 600 is inserted into the through hole and is at least partially located outside the main support 800. The exoskeleton of the luminal stent 600 conforms to the sidewalls of the through-holes. The lumen stent comprises an inner framework and an outer framework, so that the outer framework is positioned at the outer side of the tectorial membrane, the tectorial membrane can be protected by the outer framework, and the tectorial membrane is prevented from being broken under the friction of the main stent to cause inner leakage.

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

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

Claims (10)

1. The utility model provides a lumen support, its characterized in that includes tubular main part and tectorial membrane, tubular main part includes inner skeleton and exoskeleton, the tectorial membrane set up in on the inner skeleton, the exoskeleton cover is located on the inner skeleton, the exoskeleton is used for the outside of tectorial membrane forms the inoxidizing coating.

2. The luminal stent of claim 1, wherein the exoskeleton is a mesh structure, the exoskeleton comprises a first side wall and a second side wall, the area of the smallest mesh on the first side wall is smaller than the area of the smallest mesh on the second side wall when the exoskeleton is in a natural state, the first side wall is a large curved side and the second side wall is a small curved side when the exoskeleton is in a curved state.

3. The luminal stent of claim 2, wherein the second side wall is connected to the inner frame and at least one of the first side wall is suspended to form a free end.

4. The luminal stent of claim 2 wherein the exoskeleton is formed by braiding of braided filaments, wherein the braided filaments on the first side wall are hooked to each other, and wherein two adjacent peaks and valleys in the axial direction formed by the braided filaments on the second side wall do not interfere with each other.

5. The luminal stent of claim 1, wherein the inner scaffold comprises a first section, a second section, and a third section, the second section is positioned between the first section and the third section, and the second section has a compliance that is superior to a compliance of the first section and the third section, and the outer scaffold covers the second section.

6. The luminal stent of claim 5, wherein the second section comprises a plurality of undulating rings, the plurality of undulating rings being disposed at intervals along an axial direction of the second section.

7. The luminal stent of claim 6, wherein the wavy rings comprise peaks and valleys, the peaks on axially adjacent two of the wavy rings being in the same line and the valleys on axially adjacent two of the wavy rings being in the same line.

8. The luminal stent of claim 6, wherein the intersection of braided wires on the exoskeleton is located between two axially adjacent wavy rings of the second section.

9. The luminal stent of claim 5, wherein the first section, the exoskeleton and the third section are integrally woven, the first section and the third section having an outer diameter that is less than an outer diameter of the exoskeleton.

10. The luminal stent of claim 5, further comprising two visualization structures disposed at each end of the second section.

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