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

Endoluminal stent

technical field

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

Background technique

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

Endovascular aortic repair (EVAR) has been widely used clinically due to its advantages of simple operation, less trauma, and shorter operation time, and has gradually become an important method for the treatment of aortic dissection.

As shown in Figure 1, when aortic dissection occurs in the aortic arch, in order to ensure the blood circulation of the aortic arch and the three branch vessels on the basis of isolating the lesion, the main stent 700 and the branch stent 100 are usually used to achieve the above. However, under the repeated action of the periodic pulsating pressure of the blood, the main stent 700 and the branch stent 100 will produce slight shaking, so that the side walls of the main stent 700 and the branch stent 100 will rub against each other, causing the membrane to rupture, causing endovascular leak.

Contents of the invention

Based on this, it is necessary to provide a luminal stent, including a tubular body and a membrane. The tubular body includes an inner skeleton and an outer skeleton. A protective layer is formed on the outside of the film.

Optionally, the exoskeleton has a network structure, and the exoskeleton includes a first side wall and a second side wall. When the exoskeleton is in a natural state, the smallest mesh area on the first side wall is smaller than the smallest mesh area on the second side wall. The mesh area of , 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 frame, and at least one part of the first side wall is suspended to form a free end.

Optionally, the outer frame is formed by weaving braiding wires, the braiding wires on the first side wall are hooked to each other, and the braiding wires on the second side wall form two adjacent crests and troughs in the axial direction without interfering with each other.

Optionally, the inner frame includes a first segment, a second segment and a third segment connected in sequence, the second segment is located between the first segment and the third segment, and the flexibility of the second segment is greater than that of the first segment and the third segment segment compliance, the exoskeleton covers the second segment.

Optionally, the second segment includes a plurality of wave-shaped rings, and the plurality of wave-shaped rings are arranged at intervals along the axial direction of the second segment.

Optionally, the wave-shaped rings include crests and troughs, the peaks of two axially adjacent wave-shaped rings are located on the same straight line, and the wave-shaped rings of two axially adjacent wave-shaped rings are located on the same straight line.

Optionally, the outer frame is formed by braiding wires, and the intersection point of the braiding wires on the outer frame is located between two axially adjacent wave-shaped rings on the second section.

Optionally, the first section, the outer skeleton and the third section are integrally braided, 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 includes two developing structures, and the two developing structures are respectively arranged at both ends of the second section.

The present invention also provides a stent system, including the luminal stent as above, and a main stent, the main stent is provided with a through hole, and the luminal stent is inserted in the through hole and at least partly located outside the main stent.

Compared with the prior art, the beneficial effects of the luminal stent and the stent system of the present invention are:

In the present invention, the coating is arranged on the inner frame, so that the inner frame cooperates with the coating to form a sealed channel, and the outer frame is sleeved on the inner frame, so that the outer frame is located outside the coating. When the main bracket and the lumen bracket are rubbed , especially at the gap between two adjacent wave-shaped rings, since the membrane is not supported, in this area, the membrane is easily damaged by the friction of the main bracket. At this time, the exoskeleton can be A barrier is formed on the outside to prevent friction between the main support and the covering film, thus realizing the protection of the covering film.

Description of drawings

Fig. 1 is a schematic diagram of the cooperation of the main stent and the branch stent in the blood vessel in the prior art;

2 is a schematic structural view of the lumen stent in Embodiment 1 of the present invention;

3 is a schematic diagram of the exploded structure of the lumen stent in Embodiment 1 of the present invention;

Fig. 4 is another structural schematic diagram of the lumen stent in Embodiment 1 of the present invention;

Fig. 5 is a schematic exploded view of the inner skeleton and the outer skeleton in a network structure in Embodiment 1 of the present invention;

6 is a schematic structural view of the lumen stent in Embodiment 2 of the present invention;

FIG. 7 is a schematic exploded view of the lumen stent in Embodiment 2 of the present invention;

Fig. 8 is a schematic diagram of the unfolded structure of the first section, the exoskeleton and the third section in Embodiment 2 of the present invention;

9 is a schematic diagram of the expanded structure of the exoskeleton in Embodiment 2 of the present invention;

Fig. 10 is a schematic structural view of the exoskeleton in a bent state in Embodiment 2 of the present invention;

Fig. 11 is a schematic diagram of mesh deformation on the second side wall in Embodiment 2 of the present invention;

Fig. 12 is a schematic diagram of mesh deformation on the first side wall in Embodiment 2 of the present invention;

Fig. 13 is an enlarged schematic diagram of the structure at A in Fig. 8 of the present invention;

Fig. 14 is an enlarged schematic diagram of the structure at B in Fig. 9 of the present invention;

Fig. 15 is an enlarged schematic diagram of the structure at C in Fig. 9 of the present invention;

Fig. 16 is a schematic diagram of unfolding after the membrane is connected to the tubular body in Embodiment 2 of the present invention;

Figure 17 is a schematic structural view of the inner skeleton in Embodiment 3 of the present invention;

Fig. 18 is a schematic diagram of the cooperative structure of the endoluminal stent and the main stent in Embodiment 4 of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Embodiment one

This embodiment provides a lumen stent, as shown in Figure 2 and Figure 3, the lumen stent includes a tubular body and a membrane 130, the tubular body includes an inner skeleton 110 and an outer skeleton 120 sleeved on the inner skeleton 110, The covering film 130 is disposed on the inner frame 110 , and the outer frame 120 is used to form a protective layer outside the covering film 130 .

It is worth noting that the lumen stent in this embodiment can be used for endovascular treatment of aortic arch aneurysms and treatment of thoracoabdominal aortic aneurysms. Specifically, the lumen stent in this embodiment can be used as a branch stent in the chimney technique. For example, in one embodiment, the lumen stent and the main stent are arranged side by side in the arterial lumen, and the end of the lumen stent is far away from the arterial lumen communicate with branch vessels. In another implementation, the endoluminal stent can also be used as a branch stent in the in situ fenestration technique. In other embodiments, the organ cavity stent can be used in any scene where multiple stents are required to cooperate.

As shown in FIG. 2 and FIG. 3 , the tubular body includes an inner skeleton 110 and an outer skeleton 120 , and the outer skeleton 120 is sheathed on the inner skeleton 110 . The outer frame 120 and the inner frame 110 can be hooked, bonded or connected through the covering film 130 . The membrane 130 covers the inner framework 110 to form a lumen structure, and the inner framework 110 cooperates with the membrane 130 to form a sealed channel. It can be understood that, in an embodiment, the covering film 130 can also be wrapped on the outer frame 120 . It can be understood that, in another embodiment, in the released state, the inner diameter d1 of the outer skeleton 120 is greater than the outer diameter d2 of the inner skeleton 110 . In other embodiments, the inner diameter d1 of the outer frame 120 can also be equal to or smaller than the outer diameter d2 of the inner frame 110 , that is, the outer frame 120 has a certain deformability to be sleeved on the inner frame 110 .

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

In this embodiment, as shown in FIG. 3 , the inner frame 110 includes a plurality of wave-shaped rings 111 arranged at intervals along the axial direction of the inner frame 110 , and the coating 130 covers the wave-shaped rings. Object 111 to realize the connection of two adjacent wave-shaped ring objects 111.

In this embodiment, as shown in FIG. 2 and FIG. 3 , the outer skeleton 120 has a mesh structure and is formed by weaving braided wires. The outer skeleton 120 is located outside the inner skeleton 110 . 110 on the wave ring 111 connection, for example, in one embodiment, the axial ends of the outer skeleton 120 are bonded to the covering film 130 through the connecting film 131, so as to realize the connection between the outer skeleton 120 and the inner skeleton 110 connect. It can be understood that, in another embodiment, the crests of the wave-shaped ring 111 at both axial ends of the inner frame 110 are exposed, and the outer frame 120 is hooked on the exposed crests. It can be understood that, in other embodiments, the coating 130 includes an inner coating and an outer coating, the inner coating is connected to the inner side wall of the inner framework 110, and the outer coating is connected to the outer side wall of the inner framework 110. To connect, a gap is opened on the outer coating, and the outer skeleton 120 is connected to the wave-shaped ring 111 through the gap.

The advantage of this arrangement is that the outer skeleton 120 is sleeved on the inner skeleton 110, so that the outer skeleton 120 is located outside the membrane 130. When the main bracket 700 rubs against the endoluminal bracket, especially when the two adjacent wave-shaped rings In the gap between objects 111, since the coating 130 is not supported, in this area, the coating 130 is easily damaged by the friction of the main bracket 700. At this time, the outer skeleton 120 can form a barrier on the outside of the coating 130 to prevent the main The bracket 700 rubs against the covering film 130 , thereby realizing the protection of the covering film 130 .

It can be understood that, in another embodiment, as shown in FIG. 4 , the inner skeleton 210 can also be formed by cutting metal, the inner skeleton 210 has a spring spiral structure, the outer skeleton 220 is braided by braided wire to form a mesh structure, and the outer The frame 220 is connected to the inner frame 210 through the connection film 231 , and the coating film 230 covers the inner frame 210 .

It can be understood that, in other embodiments, as shown in FIG. 5 , the inner skeleton 320 includes at least one braided wire, and the braided wire is braided to form a network structure, the coating 330 is wrapped on the inner skeleton 320 , and the outer skeleton 310 It has a network structure, the outer frame 310 is sleeved on the inner frame 320 , and the outer frame 310 is connected with the inner frame 320 .

Embodiment two

The difference between this example and Embodiment 1 is that, as shown in Fig. 6 to Fig. 9, the outer skeleton 420 has a mesh structure, and the outer skeleton 420 includes a first side wall 421 and a second side wall 422, when the outer skeleton 420 is in a bent state , the first side wall 421 is the large curved side 140, and the second side wall 422 is the small curved side 150. When the outer skeleton 420 is in a natural state, the area S1 of the smallest mesh on the first side wall 421 is smaller than the second The area S2 of the smallest mesh of the side wall 422 .

In this embodiment, as shown in Figure 7, the inner frame 410 includes a first segment 411, a second segment 412 and a third segment 413; wherein, the first segment 411, the third segment 413 and the outer frame 420 are integrated by braiding wire The weaving forms a network structure, and the second segment 412 includes a plurality of wave-shaped rings 4121 arranged at intervals along the axial direction of the inner skeleton 410 .

In this embodiment, as shown in FIG. 7 , the outer frame 420 is woven with braided wires to form a mesh structure, and the braided wires can be hooked to each other, or can only intersect and overlap each other. The mesh on the outer frame 420 refers to A mesh formed by the intersection of multiple braided filaments. The exoskeleton 420 includes a bent state and a natural state. In the natural state, the exoskeleton 420 is a vertical tubular structure, and the first side wall 421 and the second side wall 422 are arranged oppositely. The first side wall 421 and the second side wall 422 Can be arranged at intervals along the circumferential direction of the outer skeleton 420 or continuously in the circumferential direction, as shown in the expanded view of the outer skeleton 420 in Figure 8 and Figure 9, the mesh size of the smallest mesh on the first side wall 421 (i.e. mesh Area S1) is smaller than the mesh size (i.e. mesh area S2) of the smallest mesh on the second side wall 422, specifically, the mesh area S1 on the first side wall 421 and the mesh area on the second side wall 422 The ratio of S2 is: 1.5-4, specifically, the ratio can be: 1.5, 2, 3 or 4. As shown in Figure 10, in the bent state, the outer frame 420 is an arc-shaped tubular structure. At this time, the outer frame 420 includes a large curved side 140 and a small curved side 150, the first side wall 421 is located on the large curved side 140, the second The two sidewalls 422 are located on the slightly curved side 150 .

It is worth explaining that, please refer to FIG. 1 and FIG. 10 again, 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 relatively large bending angle. At this time, as shown in Figure 11 (the solid line part in the figure is a schematic diagram of the mesh of the second side wall 422 in a vertical state, and the dotted line part is a schematic diagram of the mesh state of the second side wall 422 after deformation), in the lumen On the small curved side 150 of the bracket, the braided wires on the outer frame 120 move toward each other and overlap each other, so that the mesh area is reduced, so that the braided wires at the small curved side 150 are relatively dense; on the large curved side 140 of the branch bracket 100 , as shown in Figure 12 (the solid line part in the figure is a schematic diagram of the mesh of the first side wall 421 in a vertical state, and the dotted line part is a schematic diagram of the mesh state of the first side wall 421 after deformation), the outer skeleton 120 The braiding wires move opposite to each other, so that the braiding wires at the big bend side 140 are relatively sparse. At this time, the big bend side 140 forms a mesh with a larger area. In the case of force, it is attached to the mesh of the large curved side 140 , causing the coating 130 of the large curved side 140 to be easily damaged by the friction of the main bracket 700 .

The advantage of this arrangement is that, in the bent state, the first side wall 421 is located at the big bend side 140, and the braided wires on the first side wall 421 move away from each other under the pull of the two ends of the inner frame 410, so that the first side wall 421 The mesh area on the first side wall 421 becomes larger, and the mesh area on the first side wall 421 becomes larger by setting the mesh area on the first side wall 421 larger than the mesh area on the second side wall 422 in a natural state. Afterwards, there is still enough weaving filament density to form a barrier on the outside of the coating 430, which ensures the protection of the coating 430 at the large curved side 140; the second side wall 422 is located on the small curved side 150, on the second side wall 422 The braided wires move toward each other under the extrusion of the two ends of the inner skeleton 410, so that the mesh area on the second side wall 422 is reduced. At this time, even in the natural state, the mesh area on the second side wall 422 is larger than the first With regard to the mesh area on the side wall 421 , the outer skeleton 420 can still maintain sufficient weaving wire density to protect the coating 430 on the less curved side 150 .

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

In this embodiment, please continue to refer to FIG. 11 and FIG. 13 , the two ends of the outer frame 420 are connected to the first segment 411 and the third segment 413 respectively, and there is a gap between the two ends of the first side wall 421 and the covering film 430 distance, the outer frame 420 is suspended outside the inner frame 410 to form a free end, the free end means that the two ends of the first side wall 421 are not constrained by the inner frame 410 or the coating 430, for example, in this embodiment, The two ends of the first side wall 421 are not connected with the first section 411 and the third section 413, thus, at the two ends of the first side wall 421, the force transmission effect between the first side wall 421 and the inner frame 410 is interrupted or weaken.

It is worth explaining that, at the first side wall 421, the mesh area is smaller and the braided filaments are relatively dense, so that the deformation resistance of the first side wall 421 is greater than that of the second side wall 422. When the inner skeleton 410 When the middle section of the inner frame is bent, the first side wall 421 will pull the inner frame 410, which increases the difficulty of bending the inner frame 410 and reduces the deformation performance of the inner frame 410. Wherein, the deformability refers to the ease of bending the inner frame 410 , the better the deformability, the easier the inner frame 410 bends, and the worse the deformability, the harder it is to bend the inner frame 410 .

Thus, by connecting the second side wall 422 with the inner frame 410, the connection between the outer frame 420 and the inner frame 410 is realized, and at least one end of the first side wall 421 is suspended to form a free end, so that the first side wall 421 and the inner frame The force transmission of 410 is interrupted or weakened at the two ends of the first side wall 421. On the one hand, the interference of the first side wall 421 to the bending deformation of the inner frame 410 is weakened, and the flexibility of the inner frame 410 is increased; On the one hand, when the inner frame 410 is bent and deformed, the first side wall 421 is weakly pulled by the inner frame 410, so that the bending degree of the first side wall 421 is smaller than that of the inner frame 410, so that the first side wall There is a certain gap between the 421 and the covering film 430 , allowing space for the first side wall 421 to be deformed under pressure, and reducing the probability of contact between the main bracket 700 and the covering film 430 .

Further, in order to prevent the first side wall 421 from being excessively pulled by the inner skeleton 410 and causing the mesh area to be too large, as shown in Fig. 9, Fig. 14 and Fig. 15, the outer skeleton 420 is formed by weaving braided silk, and the first side The braided wires on the wall 421 are interlocked, and the axially adjacent crests and troughs formed by the braided wires on the second side wall 422 do not interfere with each other.

In this embodiment, the outer skeleton 420 includes a first braided wire and a second braided wire, the first braided wire is heat-set to form the first wave structure 423 after weaving, and the second braided wire is heat-set to form the second wave structure 423 after braiding. The wave structure 424, the first wave structure 423 includes a first wave trough 4231, and the second wave structure 424 includes a second wave peak 4241, as shown in FIG. Pass through the inner side of the first wave trough 4231 and then turn over towards the outer side of the second wave peak 4241 to realize mutual hooking of braided filaments; as shown in Figure 15, in the area where the second side wall 422 is located, the second wave peak 4241 is located Inside or outside of a trough 4231 , the second crest 4241 fits the first trough 4231 , and the second crest 4241 does not interfere with the first trough 4231 .

In another embodiment, in the area where the first side wall 421 is located, when the second crest 4241 crosses the first trough 4231, multiple turns are wound at the first trough 4231 to increase the distance between the first trough 4231 and the second crest 4241. Connection stability. In other embodiments, in the area where the first side wall 421 is located, the highest point of the second crest 4241 is welded to the lowest point of the first trough 4231 .

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 on the large curved side 140, and the braided wires on the first side wall 421 move away from each other under the pull of the two ends of the inner skeleton 410 , when the braiding wires move away from each other to a certain distance, the braiding wires on the first side wall 421 are hooked to each other to limit the displacement of the braiding wires moving back to each other, thereby constraining the first side The limit mesh area of the wall 421 in the bent state prevents the covering film 430 from being exposed due to the excessive mesh area of the first side wall 421 in the bending state, and weakens the protective effect of the outer frame 420 on the covering film 430 .

Further, as shown in FIG. 6 and FIG. 7 , the inner skeleton 410 includes a first segment 411 , a second segment 412 and a third segment 413 , and the compliance of the second segment 412 is greater than that of the first segment 411 and the third segment 413 Specifically, the exoskeleton 420 is located at least on the outside of the second section 412 .

As shown in FIG. 7 , the second section 412 includes a plurality of wave-shaped rings 4121 arranged at intervals along the axial direction of the second section 412 . In a natural state, the axes of all the wave-shaped rings 4121 are on the same straight line as the axes of the first section 411 and the third section 413 . There is a distance between two adjacent wave-shaped rings 4121. Exemplarily, the wave-shaped ring 4121 includes a first wave-shaped ring 4121a and a second wave-shaped ring 4121b, and the first wave-shaped ring 4121a includes The first end face, the first end face is located at one end of the first wave-shaped ring 4121a close to the second wave-shaped ring 4121b, the second wave-shaped ring 4121b includes a second end face, and the second end face is located near the second wave-shaped ring 4121b At one end of the first wave-shaped ring 4121a, there is a distance d3 between the first end surface and the second end surface, and the distance d3 is -3 to 5 mm; specifically, the distance d3 can be -3, -1, 0, 2 or 5mm. .

In this embodiment, as shown in FIG. 11 , the first segment 411, the third segment 413 and the outer frame 420 are integrally braided and formed by braiding wires, and the first segment 411, the third segment 413 and the outer frame 420 form a network structure as a whole , the first section 411 and the third section 413 are respectively located at the 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 first section 411 and the third section 413 are The mesh areas can be the same or different. In a natural state, the axes of the first section 411, the third section 413 and the outer frame 420 are located on the same straight line.

As shown in Figure 16, the covering film 430 includes an inner covering film 431 and an outer covering film 432, the inner covering film 430 is located inside the first section 411, the second section 412 and the third section 413, and covers the first section 411, The inner side walls of the second section 412 and the third section 413 make the inner frame 410 form a sealed channel. The outer covering film 432 includes a first outer covering film 4321, a second outer covering film 4322 and a third outer covering film 4323. The first outer covering film 4321 covers the outer side wall of the first section 411, and the second outer covering film 4322 covers On the outer wall of the second section 412, the third outer covering film 4323 covers the outer wall of the third section 413. After the outer covering film 430 covers the first section 411, the second section 412 and the third section 413, the outer skeleton 420 is located on the outer wall of the second outer covering film 4322 , so as to realize the protection of the second outer covering film 4322 .

Therefore, when the inner skeleton 410 is bent, the second section 412 includes a plurality of wave-shaped rings 4121, and the plurality of wave-shaped rings 4121 are arranged at intervals, so that the plurality of wave-shaped rings 4121 will not interfere with each other , so that the second section 412 is easier to be bent, so the flexibility is better, and a good circular lumen can still be maintained in the bent state, ensuring smoothness of blood.

It is worth explaining that the test method for the flexibility of the endoskeleton 410 can be in accordance with D.5.3 in Appendix D of YY/T0663.2-2016 "Cardiovascular Implants and Intravascular Devices Part II: Vascular Stents". 6 bent/folded sections to make. For example, in one embodiment, the luminal stent is placed in a straight tube, the stent-loaded straight tube is placed on a cylindrical caliper gauge, and the worst case orientation of the stent is tested; the stent-loaded catheter is wound around the gauge , so that the entire length of the stent can be released from the gauge, or a maximum bend of 180°; record the radius, and whether severe stenosis is observed; remove the force applied to the stent, and record whether the stent can return to the original geometric administration; gradually reduce Gauge the radii and record the radii and occurrences of severe downloading repeatedly until there is a discount or the stent diameter is reduced by 50%.

Further, please refer to FIG. 16 again, the first outer covering film 4321 , the second outer covering film 4322 and the third outer covering film 4323 are arranged at intervals.

It should be noted that the first outer covering film 4321 is wrapped on the outer wall of the first section 411, and there is a distance between the first outer covering film 4321 and the second outer covering film 4322, so that the first section 411 and the second section The outer covering film 432 at the junction of 412 is cut off, and there is a distance between the second outer covering film 4322 and the third outer covering film 4323 , so that the outer covering film at the junction of the third section 413 and the second section 412 is cut off. Thus, the first outer covering film 4321 and the second outer covering film 4322 are arranged at intervals, so that there is a gap between the first outer covering film 4321 and the second outer covering film 4322, and the second outer covering film 4322 and the third outer covering film 4322 The coatings 4323 are arranged at intervals, so that there is a gap between the second outer coating 4322 and the third outer coating 4323 , which can prevent the outer coating 432 from covering the outer frame 420 , thereby increasing the compliance of the outer frame 420 .

Further, in order to facilitate the compression of the endoluminal stent into the delivery device, as shown in FIG. 16 , the intersection point p of the braided wires on the outer skeleton 420 is located between two adjacent wave-shaped rings 4121 . For example, in one embodiment, a plurality of wave-shaped rings 4121 are arranged at intervals, and an accommodating space for the intersection point p of the braided yarn is formed between two adjacent wave-shaped rings 4121 .

Therefore, when the endoluminal stent needs to be compressed into the delivery device for transvascular delivery to the target position, the intersection point p of the braided wire passing through the outer skeleton 420 is located between two adjacent wave-shaped rings 4121, so that An accommodating space for the intersecting point p of the braided wire can be formed between two adjacent wave-shaped rings 4121, so that the space on the second section 4121 can be utilized to the greatest extent, and the difficulty of compressing the endoluminal stent into the delivery device can be reduced.

Further, in order to facilitate the staff to identify the position of the curved section, please refer to Fig. 6 and Fig. 7 again, the lumen support further includes a plurality of developing structures 440, and the multiple developing structures 440 are respectively arranged at the two axial ends of the second segment 412 . It should be noted that the developing structure 440 is made of a developing material, which can be a material with good developing effect such as tantalum, platinum, gold, etc. The developing structure 440 includes a developing wire, and the developing wire is wound around the corrugated rings at both ends of the second segment 412 in the axial direction. On the object 4121. In other embodiments, the developer material is welded on the corrugated rings 4121 at both ends of the second segment 412 . Therefore, by arranging the developing structures 440 at both ends of the second section 412 in the axial direction, the position of the outer frame 420 can be marked during the release process of the stent, which is convenient for the staff to identify that this position is more suitable for matching with other stents.

In this way, when the endoluminal stent is used in conjunction with the main stent 700, the bending usually occurs at the second section 412, and the area of friction with the main stent 700 usually also occurs at the second section 412, and the flexibility through the second section 412 is relatively high. The large setting enables the second section 412 to still maintain a better circular lumen in a curved state, ensuring the smoothness of blood, and the outer framework 420 only covers the middle section 412 so that the outer framework 420 does not need The inner framework 410 is entirely covered, thereby reducing the coverage area of the outer framework 420 and reducing the difficulty of compressing and loading the endoluminal stent into the delivery device.

In other embodiments, as shown in FIG. 17 , the first section 511, the second section 512 and the third section 513 each include a plurality of wave rings arranged at intervals, wherein the first section 511, the third section 513 The phases of the waveforms of the two adjacent waveform rings on the second section 512 are opposite, and the phases of the waveforms of the two adjacent waveform rings on the second section 512 are the same. For example, in one embodiment, the second segment 512 includes a first waveform ring and a second waveform ring, the first waveform ring includes a first peak 5121 and a first valley 5122, the second waveform ring The object includes a second peak 5123 and a second valley 5124, the first peak 5121 and the second peak 5123 are located on the same vertical line, the first valley 5122 and the second valley 5124 are located on the same vertical line, so that the second section 512 The phases of the waveforms of two adjacent waveform rings are the same. The first segment 511 includes a third wave ring and a fourth wave ring, the third wave ring includes a third peak 5111 and a third valley 5112, and the fourth wave ring includes a fourth peak 5113 and a fourth wave ring. The trough 5114, the third peak 5111 and the fourth trough 5114 are set opposite to each other, and the trough of the third wave 5112 is set opposite to the fourth peak 5113, so that the phases of the two adjacent waveform rings on the first section 511 are reversed. The third section 513 includes a fifth waveform ring and a sixth waveform ring, the fifth waveform ring includes a fifth peak 5131 and a fifth valley 5132, and the sixth waveform ring includes a sixth peak 5133 and a sixth The wave trough 5134, the fifth wave peak 5131 and the sixth wave trough 5134 are set opposite to each other, and the fifth wave trough 5132 and the sixth wave peak 5133 are set opposite to each other, so that the phases of the waveforms of the two adjacent wave rings on the third section 513 are reversed. Thus, the waveform phases of the wave-shaped rings on the second section 512 are the same, so that there is a larger gap between two adjacent wave-shaped rings, and a certain degree of space is provided for the two adjacent wave-shaped rings. Displacing space, so that the second section 512 has better flexibility, through the configuration of the wave phases of the adjacent two wave-shaped rings on the first section 511 and the third section 513, when the inner skeleton 510 bends , two adjacent wave-shaped rings interfere with each other, so that the first segment 511 and the third segment 513 have better bending resistance.

Embodiment Four

This embodiment provides a stent system. As shown in FIG. 18 , the stent system includes the luminal stent 600 and the main stent 800 as described above, the main stent 600 and the luminal stent 800 are arranged side by side, and one end of the luminal stent 600 is bent Facing the branch vessels, the outer frame is at least partially attached to the outer wall of the main stent, so that the outer frame can reduce or eliminate the friction between the main stent and the membrane, thereby realizing the protection of the membrane and preventing the membrane from being damaged by the main bracket. Crack under friction, causing internal leakage

In another embodiment, the main stent 800 is provided with a through hole, and the endoluminal stent 600 is inserted into the through hole and at least partly located outside the main stent 800 . The outer frame of the lumen support 600 fits the side wall of the through hole. The lumen stent includes an inner skeleton and an outer skeleton, so that the outer skeleton is located outside the membrane, so that the outer framework can protect the membrane and prevent the membrane from breaking under the friction of the main bracket and causing endoleak.

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

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on 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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