CN111228002B

CN111228002B - Lumen stent

Info

Publication number: CN111228002B
Application number: CN201811348683.4A
Authority: CN
Inventors: 肖本好; 王逸斐
Original assignee: Shenzhen Xianjian Changtong Medical Co ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2018-11-13
Filing date: 2018-11-13
Publication date: 2022-05-03
Anticipated expiration: 2038-11-13
Also published as: CN111228002A

Abstract

The invention relates to a lumen stent, which comprises a tube body and a sealing structure sleeved on the tube body, wherein the sealing structure comprises a sealing film, a plurality of first supporting rods and a plurality of second supporting rods, the plurality of second supporting rods correspond to the plurality of first supporting rods one by one, the plurality of first supporting rods are arranged at intervals along the circumferential direction of the tube body, one end of each first supporting rod is connected with the tube body, the other end of each first supporting rod extends obliquely relative to the longitudinal central axis of the tube body to enable the plurality of first supporting rods to be arranged radially, one end of each second supporting rod is connected with one end of each first supporting rod far away from the tube body, the other end of each second supporting rod extends axially along the longitudinal central axis of the tube body, and the free end of at least one second bracing piece forms a plurality of branches, and the seal membrane cladding is on a plurality of first bracing pieces and on a plurality of second bracing pieces, and the one end of keeping away from the free end of second bracing piece of seal membrane is connected with the surface sealing of body. The lumen stent can better avoid intra-operative leakage.

Description

Lumen stent

Technical Field

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

Background

At present, the isolation of diseased regions in the body lumen by intraluminal isolation using luminal stents has become an increasingly important treatment modality. For example, luminal stents may be employed to isolate arterial dissections or aneurysms in blood vessels.

In the field of aortic intracavity treatment, when the anchoring area of the aortic stent graft is insufficient due to the fact that a dissection is too close to a branch blood vessel, the aims of isolating a diseased part and opening the branch blood vessel are achieved at the same time by generally adopting a chimney technology or an in-situ windowing technology. The chimney technique is to pass the stent graft 20 over and cover the opening of the branch vessel 1, and simultaneously axially release a branch stent 10 in parallel in the aortic lumen 2, wherein the distal end of the branch stent 10 enters the branch vessel 1, and the proximal end is located on the surface of the stent graft 20 to ensure the blood supply of the branch vessel 1, as shown in fig. 1 a.

The chimney technique is limited by the fit relationship between the stent graft 20 and the branch stent 10, and the inter-stent gap 30 is often inevitably generated, as shown in fig. 1b, which may cause intra-operative leakage, and thus cause the operation to fail to achieve the desired effect.

Disclosure of Invention

Based on this, there is a need for a luminal stent which can better avoid intraoperative endoleaks.

A pipe cavity support comprises a pipe body and a sealing structure sleeved on the pipe body, wherein the sealing structure comprises a sealing film, a plurality of first supporting rods and a plurality of second supporting rods, the plurality of second supporting rods correspond to the plurality of first supporting rods one to one, the plurality of first supporting rods are arranged at intervals along the circumferential direction of the pipe body, one end of each first supporting rod is connected with the pipe body, the other end of each first supporting rod is opposite to the pipe body, the longitudinal central axis of the pipe body is inclined and extended to enable the plurality of first supporting rods to be arranged in a radial mode, one end of each second supporting rod is connected with one end, far away from the pipe body, of each first supporting rod, the other end of each second supporting rod is axially extended along the longitudinal central axis of the pipe body, at least one free end of each second supporting rod forms a plurality of branches, and the sealing film is wrapped on the plurality of first supporting rods and the plurality of second supporting rods, and one end of the sealing film, which is far away from the free end of the second supporting rod, is connected with the outer surface of the pipe body in a sealing manner.

In one embodiment, the end faces of the free ends of the plurality of branches on each second support rod are all located on the same plane.

In one embodiment, a plurality of branches are formed on the free ends of the second support rods, and the end surfaces of the free ends of all the branches are located on the same plane.

In one embodiment, the width of each branch is smaller than the width of the second support bar.

In one embodiment, the plurality of branches on each second support rod are arranged at equal intervals along the circumferential direction of the tube body.

In one embodiment, the width of the branch is 0.02-0.15 mm.

In one embodiment, the number of the branches on each second supporting rod is 2-8.

In one embodiment, the second support bar is parallel to the longitudinal central axis of the tube body.

In one embodiment, the included angle between each second support rod and the corresponding first support rod is 20-90 °.

In one embodiment, the tube body comprises a coating film and a plurality of corrugated rings, the corrugated rings are arranged along the axial direction, and the coating film is coated on the corrugated rings to form a tube cavity structure.

In one embodiment, one end of each first supporting rod is connected with one of the wave rings, so that a plurality of first supporting rods are connected with the pipe body.

In one embodiment, one end of each first supporting rod is connected with one of the wave coils in a winding mode, so that a plurality of first supporting rods are connected with the pipe body;

or, the plurality of first supporting rods and one of the wave rings are of an integrated structure, so that the plurality of first supporting rods are connected with the pipe body.

In one embodiment, each first supporting rod is 2-25 mm long.

In one embodiment, the number of the first supporting rods is 3-20.

In one embodiment, the included angle between each first support rod and the longitudinal central axis of the pipe body is 10-90 degrees.

In one embodiment, the width of the first supporting rod is 0.1-0.4 mm.

In one embodiment, the first support rods are arranged at equal intervals along the circumferential direction of the pipe body;

or, a plurality of the first supporting rods are arranged at unequal intervals along the circumferential direction of the pipe body, and a concentrated distribution area and a non-concentrated distribution area are formed.

In one embodiment, each of the first support rods is coplanar with a longitudinal central axis of the pipe body; or,

each first support rod is not coplanar with the longitudinal central axis of the pipe body; or,

in the plurality of first support rods, a part of the first support rods are coplanar with the longitudinal central axis of the pipe body, and the other part of the first support rods are not coplanar with the longitudinal central axis of the pipe body.

In one embodiment, the plurality of first support rods are not in direct contact with each other, and any two first support rods in the plurality of first support rods are directly connected without a connecting member.

The sealing structure of the lumen stent comprises a plurality of first supporting rods which are arranged in a radial mode and a plurality of second supporting rods which are respectively connected with the first supporting rods, the other end of each second supporting rod axially extends along the longitudinal central axis of the tube body, and a plurality of branches are formed at the free end of at least one second supporting rod. When releasing this lumen support to the appointed position in the blood vessel, the tectorial membrane support of seal structure self-expanding expansion and laminating aorta intracavity owing to set up a plurality of first bracing pieces and a plurality of second bracing pieces for seal structure is great along the axial coverage area of body, and the shutoff effect preferred. And, the free end of at least one second bracing piece is formed with a plurality of branches, through the respective resilience performance of more thinner branches, improves the shutoff effect to can better shutoff lumen support and tectorial membrane support between the clearance, therefore can avoid leaking in the art better.

Drawings

FIG. 1a is a schematic view of a stent graft and a branch stent of the prior art implanted in a specified portion of a blood vessel;

FIG. 1b is a schematic view of a stent graft and a branch stent of the prior art implanted at another angle at a designated site of a blood vessel;

FIG. 2 is a schematic structural view of one embodiment of the luminal stent without a second support rod;

FIG. 3 is a schematic view of the connection of the first support rod to the tubular body of the luminal stent shown in FIG. 2 without the second support rod;

FIG. 4 is a schematic structural view of another embodiment of the luminal stent without a second support rod;

FIG. 5 is a schematic structural view of one embodiment of the luminal stent with the branch of the free end of the second support rod omitted;

FIGS. 6 a-6 b are schematic views showing the gaps between the luminal stent occlusion and the covered stent shown in FIGS. 2 and 5;

FIG. 7 is a schematic view showing the connection of the first support rod, the second support rod with the branch of the free end omitted and the tube body of the sealing structure of the luminal stent shown in FIG. 5;

FIG. 8 is a schematic structural view of a sealing structure of a luminal stent of yet another embodiment;

fig. 9 is a schematic view of the sealing structure of fig. 8 in a state of sealing the gap between the luminal stent and the stent graft.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In the field of interventional medical devices, the "proximal end" of a luminal stent is defined as the end near the heart and the "distal end" of a luminal stent is defined as the end away from the heart. "axial" refers to a direction parallel to the line connecting the proximal center and the distal center of the luminal stent, and "radial" refers to a direction perpendicular to the above-mentioned axial direction.

Referring to fig. 2, an embodiment of a luminal stent 100 includes a tube 110 and a sealing structure 120 sleeved on the tube 110.

Referring to fig. 3, the tube 110 includes a covering film 112 and a plurality of corrugated rings 114, the plurality of corrugated rings 114 are axially arranged, and the covering film 112 covers the plurality of corrugated rings 114 to form a tube cavity structure.

The material of the cover film 112 may be plastic, dacron, polyester, or the like. For example, the plastic may be Polytetrafluoroethylene (PTFE), the polyester may be polyethylene terephthalate (PET) or Polyurethane (PU), and so forth.

In one embodiment, the material of the wave ring 114 is a shape memory metal material, including but not limited to nitinol, copper-based shape memory alloy, or iron-based shape memory alloy, among others. In other embodiments, the material of the wave ring 114 may be other materials with shape memory properties, such as shape memory polymers.

In the present embodiment, there is no additional connection member between the plurality of corrugated rings 114, and the plurality of corrugated rings 114 are connected integrally by the coating 112. The coating 112 may be a single layer of film covering the outer surfaces of the plurality of wave rings 114, or may be a double layer of film respectively disposed on the outer surface and the inner surface of the wave rings 114 so as to sandwich the wave rings 114 therebetween.

It is understood that in other embodiments, after the plurality of wave-shaped rings 114 can be connected to each other by additional connecting members to form a tube cavity, the covering film 112 is covered on the plurality of wave-shaped rings 114 to form a tube cavity structure. The connectors may be rod-like connectors, S-shaped connectors or omega-shaped connectors, etc.

Referring again to fig. 2, the sealing structure 120 includes a sealing membrane 122 and a plurality of first support posts 124. The plurality of first support rods 124 are arranged at intervals along the circumferential direction of the tube body 110, one end of each first support rod 124 is connected with the tube body 110, and the other end of each first support rod 124 extends obliquely relative to the longitudinal central axis of the tube body 110, so that the plurality of first support rods 124 are arranged radially to form a generally circular truncated cone-shaped support structure. In the supporting structure, an end of the supporting structure where the upper bottom surface (the bottom surface with the smaller diameter) is located is an end of the first supporting rod 124 connected to the tube 110. The sealing membrane 122 is wrapped over a plurality of first support rods 124. Also, one end of the sealing film 122 located at the upper bottom surface (the bottom surface with the smaller diameter) of the support structure is sealingly connected with the tube body 110, such that one end of the sealing structure 120 is a closed end and one end is an open end, and the width of the open end is greater than the width of the sealed end.

The material of the sealing film 122 may be plastic, dacron, polyester, or the like. For example, the plastic may be Polytetrafluoroethylene (PTFE), the polyester may be polyethylene terephthalate (PET) or Polyurethane (PU), and so forth.

In the supporting structure, the plurality of first supporting rods 124 are spaced apart from each other, and the plurality of first supporting rods 124 are not in contact with each other, that is, any two first supporting rods 124 are not in contact with each other. Moreover, any two first support rods 124 are not connected with any direct connection member or indirect connection member, and the plurality of first support rods 124 are kept independent. That is, in the sealing structure 120, any two first support rods 124 are not in contact with each other in the support structure itself, except that the sealing film 122 connects the plurality of first support rods 124 as a whole. And, any two first support rods 124 are connected without any direct connection member and indirect connection member.

The material of the first support rod 124 is a shape memory metal material, including but not limited to nitinol, copper-based shape memory alloy, or iron-based shape memory alloy. In other embodiments, the material of the first support bar 124 may also be other materials with shape memory properties, such as shape memory polymers.

By properly designing the length of the first supporting rod 124 and the included angle between the first supporting rod 124 and the longitudinal central axis of the tube 110, the size of the sealing area of the sealing structure 120 can be properly adjusted to adapt to individual differences.

The longer the first support rod 124 is, the more the first support rod 124 is, the lower the resilience is, the less the sealing structure 120 is unfolded, and meanwhile, because the first support rod 124 of the sealing structure 120 is attached to the surface of the tube 110 in the sheathing state, the too long first support rod 124 may cause the conveyor to have poor flexibility and to be difficult to convey; however, if the length of the first support rod 124 is too small, the area covered by the seal structure 120 in the axial direction of the pipe body 110 is small, and it is difficult to obtain a good sealing effect. Therefore, in one embodiment, as shown in fig. 3, the length L of the first supporting rod 124 is 2 to 25 mm.

In one embodiment, the length L of the first support bar 124 is about 15 mm.

In one embodiment, the lengths L of the first support struts 124 are all equal.

3 in 3 one 3 embodiment 3, 3 the 3 angle 3 α 3 ( 3 shown 3 in 3 FIG. 3 3 3) 3 between 3 the 3 first 3 support 3 bar 3 124 3 and 3 the 3 central 3 longitudinal 3 axis 3 A 3- 3 A 3 of 3 the 3 tubular 3 body 3 110 3 is 3 between 3 about 3 10 3 and 3 about 3 90 3. 3

3 in 3 one 3 embodiment 3, 3 the 3 angle 3 α 3 between 3 the 3 first 3 support 3 rod 3 124 3 and 3 the 3 central 3 longitudinal 3 axis 3 A 3- 3 A 3 of 3 the 3 tubular 3 body 3 110 3 is 3 45 3 ° 3. 3

The larger the number of the first supporting rods 124, the more difficult the sheathing, and the larger the inner diameter of the sheath tube required to be matched, which results in difficult or even impossible delivery. If the number of the first support rods 124 is too small, the support performance of the support structure formed by all the first support rods 124 is weak, so that the sealing structure 120 is difficult to be tightly attached to the stent graft 10, and thus a superior occlusion effect is difficult to obtain. Meanwhile, when the number of the first support rods 124 is small, it is difficult to maintain the sealing structure 120 in a desired contour shape for good sealing for a long time due to weak support performance of the support structure, thereby making it difficult to obtain a continuously good sealing effect. Therefore, on the premise of ensuring sheathing and conveying, in order to ensure the plugging effect, in one embodiment, the number of the first supporting rods 124 is 3-20.

In one embodiment, the number of the first support bars 124 is 10.

When the number of the first supporting rods 124 is fixed, the larger the width (e.g., diameter, side length, etc.) of the first supporting rods 124 is, the greater the sheathing difficulty is, the larger the inner diameter of the sheath tube required to be matched is, and the difficulty or even incapability of conveying is caused. However, the width of the first supporting rod 124 is too small, which results in insufficient resilience of the first supporting rod 124 and thus affects the plugging effect. Therefore, in one embodiment, the width of the first supporting rod 124 is 0.1-0.4 mm for both the resilience of the first supporting rod 124 and the sheathing and conveying requirements.

In one embodiment, the first support bar 124 has a width of 0.2 mm.

It should be noted that the specific definition of the width varies with the shape of the first support bar 124. For example, when the first support bar 124 is a cylindrical bar, the width refers to the diameter of the cylindrical bar. When the first support bar 124 is a bar having a square cross section, the width refers to the side length of the square bar. When the first support bar 124 is a bar having a rectangular cross section, the width refers to the length of the side in the radial direction after sheathing. When the first support bar 124 is a bar having an irregular shape in cross section, the width refers to the width in the radial direction after sheathing.

In this embodiment, a plurality of first support rods 124 are arranged at equal intervals along the circumference of the tube body 110, so that the lumen stent 100 has no directivity, does not need to be rotated and aligned in the release process, and is beneficial to the release of the lumen stent 100, thereby being beneficial to reducing the operation time, reducing the blocking time for blood flow and improving the safety of the operation process.

In other embodiments, the plurality of first support rods 124 are arranged at unequal intervals in the circumferential direction of the pipe body 110, and form a concentrated distribution region and a non-concentrated distribution region. The concentrated distribution area refers to a larger number of the first support rods 124 in the area, but the plurality of first support rods 124 in the area may be arranged at equal intervals or at unequal intervals. The non-concentrated distribution region means that the number of the first support bars 124 in the region is less than that of the first support bars 124 in the concentrated distribution region, and the plurality of first support bars 124 in the region may be arranged at equal intervals or may be arranged at unequal intervals. A plurality of first supporting rods 124 are arranged according to the concentrated distribution area and the non-concentrated distribution area, so that the concentrated distribution area can better block special gaps, the blocking effect of the special area is improved, and the intra-operative leakage can be better avoided.

For example, when there are many plaques in the blood vessel and the inner wall of the blood vessel is not smooth enough, the concentrated distribution area of the first support rods 124 of the sealing structure 120 is attached to the inner wall of the blood vessel, and the first support rods 124 arranged densely are beneficial to fully attaching to the irregular surface of the inner wall of the blood vessel, so as to improve the plugging effect.

Referring again to fig. 2, in the present embodiment, each first supporting rod 124 is coplanar with the longitudinal central axis of the tube 110.

3 in 3 other 3 embodiments 3, 3 as 3 shown 3 in 3 FIG. 3 4 3, 3 each 3 of 3 the 3 first 3 support 3 rods 3 124 3 is 3 not 3 coplanar 3 with 3 the 3 longitudinal 3 central 3 axis 3 A 3- 3 A 3 of 3 the 3 tubular 3 body 3 110 3. 3

3 each 3 first 3 support 3 bar 3 124 3 is 3 not 3 coplanar 3 with 3 the 3 longitudinal 3 central 3 axis 3 a 3- 3 a 3 of 3 the 3 tubular 3 body 3 110 3 such 3 that 3 each 3 first 3 support 3 bar 3 124 3 is 3 more 3 resilient 3. 3 This is because the length of each first support bar 124 that is not coplanar is longer than the length of the coplanar first support bars 124 in the same natural state, so that the sizing process for the longer first support bars 124 is more sufficient than for the shorter first support bars 124 in the heat treatment sizing. 3 each 3 first 3 support 3 rod 3 124 3 is 3 not 3 coplanar 3 with 3 the 3 longitudinal 3 central 3 axis 3 A 3- 3 A 3 of 3 the 3 pipe 3 body 3 110 3, 3 so 3 that 3 after 3 release 3, 3 the 3 sealing 3 structure 3 120 3 has 3 better 3 resilience 3 performance 3 on 3 the 3 whole 3, 3 opposite 3 parts 3 can 3 be 3 better 3 sealed 3, 3 and 3 the 3 plugging 3 effect 3 is 3 improved 3. 3

In the embodiment shown in fig. 4, each first support rod 124 is a straight rod. 3 3 3 in 3 3 3 other 3 3 3 embodiments 3 3 3 where 3 3 3 each 3 3 3 of 3 3 3 the 3 3 3 first 3 3 3 support 3 3 3 rods 3 3 3 124 3 3 3 is 3 3 3 not 3 3 3 coplanar 3 3 3 with 3 3 3 the 3 3 3 longitudinal 3 3 3 central 3 3 3 axis 3 3 3 a 3 3 3- 3 3 3 a 3 3 3 of 3 3 3 the 3 3 3 tubular 3 3 3 body 3 3 3 110 3 3 3, 3 3 3 the 3 3 3 shape 3 3 3 of 3 3 3 each 3 3 3 of 3 3 3 the 3 3 3 first 3 3 3 support 3 3 3 rods 3 3 3 124 3 3 3 is 3 3 3 not 3 3 3 limited 3 3 3 to 3 3 3 a 3 3 3 straight 3 3 3 rod 3 3 3 shape 3 3 3, 3 3 3 and 3 3 3 may 3 3 3 be 3 3 3 various 3 3 3 shapes 3 3 3, 3 3 3 such 3 3 3 that 3 3 3 the 3 3 3 plurality 3 3 3 of 3 3 3 first 3 3 3 support 3 3 3 rods 3 3 3 124 3 3 3 are 3 3 3 radially 3 3 3 arranged 3 3 3 and 3 3 3 each 3 3 3 of 3 3 3 the 3 3 3 first 3 3 3 support 3 3 3 rods 3 3 3 124 3 3 3 is 3 3 3 not 3 3 3 coplanar 3 3 3 with 3 3 3 the 3 3 3 longitudinal 3 3 3 central 3 3 3 axis 3 3 3 a 3 3 3- 3 3 3 a 3 3 3 of 3 3 3 the 3 3 3 tubular 3 3 3 body 3 3 3 110 3 3 3. 3 3 3 For example, each of the first support bars 124 is an arc-shaped bar or a spiral-shaped bar, so that the plurality of first support bars 124 are flower-shaped as a whole.

3 3 3 it 3 3 3 is 3 3 3 understood 3 3 3 that 3 3 3 in 3 3 3 other 3 3 3 embodiments 3 3 3, 3 3 3 the 3 3 3 plurality 3 3 3 of 3 3 3 first 3 3 3 support 3 3 3 rods 3 3 3 124 3 3 3 can 3 3 3 be 3 3 3 arranged 3 3 3 such 3 3 3 that 3 3 3 there 3 3 3 are 3 3 3 first 3 3 3 support 3 3 3 rods 3 3 3 124 3 3 3 that 3 3 3 are 3 3 3 coplanar 3 3 3 with 3 3 3 the 3 3 3 longitudinal 3 3 3 central 3 3 3 axis 3 3 3 a 3 3 3- 3 3 3 a 3 3 3 of 3 3 3 the 3 3 3 tube 3 3 3 body 3 3 3 110 3 3 3 and 3 3 3 there 3 3 3 are 3 3 3 first 3 3 3 support 3 3 3 rods 3 3 3 124 3 3 3 that 3 3 3 are 3 3 3 not 3 3 3 coplanar 3 3 3 with 3 3 3 the 3 3 3 longitudinal 3 3 3 central 3 3 3 axis 3 3 3 a 3 3 3- 3 3 3 a 3 3 3 of 3 3 3 the 3 3 3 tube 3 3 3 body 3 3 3 110 3 3 3. 3 3 3

Referring to fig. 5, the sealing structure 120 further includes a plurality of second support bars 126. The plurality of first support bars 124 and the plurality of second support bars 126 correspond one to one. 3 one 3 end 3 of 3 each 3 second 3 support 3 rod 3 126 3 is 3 connected 3 to 3 the 3 end 3 of 3 the 3 corresponding 3 first 3 support 3 rod 3 124 3 remote 3 from 3 the 3 tube 3 body 3 110 3, 3 and 3 the 3 other 3 end 3 of 3 each 3 second 3 support 3 rod 3 126 3 extends 3 axially 3 along 3 the 3 longitudinal 3 central 3 axis 3 a 3- 3 a 3 of 3 the 3 tube 3 body 3 110 3. 3 And, an end of the second support bar 126 away from the first support bar 124 is a free end. 3 in 3 this 3 embodiment 3, 3 the 3 sealing 3 film 3 122 3 extends 3 axially 3 along 3 the 3 central 3 longitudinal 3 axis 3 A 3- 3 A 3 of 3 the 3 tube 3 110 3 to 3 the 3 free 3 end 3 of 3 the 3 second 3 support 3 rod 3 124 3 to 3 completely 3 cover 3 the 3 first 3 and 3 second 3 support 3 rods 3 124 3, 3 126 3. 3

3 in 3 this 3 embodiment 3, 3 the 3 area 3 covered 3 by 3 the 3 sealing 3 structure 3 120 3 in 3 the 3 axial 3 direction 3 of 3 the 3 tube 3 body 3 110 3 is 3 increased 3 due 3 to 3 the 3 addition 3 of 3 the 3 plurality 3 of 3 second 3 support 3 rods 3 126 3 extending 3 in 3 the 3 axial 3 direction 3 a 3- 3 a 3 along 3 the 3 longitudinal 3 center 3 axis 3 of 3 the 3 tube 3 body 3 110 3 by 3 the 3 luminal 3 stent 3 100 3. 3 When the anchoring distance between the luminal stent 100 and the stent graft 20 is long after the luminal stent 100 and the stent graft 20 are implanted at a designated site in a blood vessel, the area of the gap is small (as shown in fig. 6a and 6b, the coverage area of the gap 30 of fig. 6b is larger than that of the gap 30 of fig. 6 a), which is beneficial for avoiding endoleaks. Therefore, the sealing structure 120 has a larger covering area along the axial direction of the tube body 110, and the blocking effect of the lumen stent 100 is obviously better than that of the lumen stent 100 with a smaller covering area along the axial direction of the tube body 110. Therefore, the lumen stent 100 provided with the second support rod 126 has better plugging effect and better effect of avoiding inner leakage in the operation.

3 moreover 3, 3 the 3 sealing 3 structure 3 120 3 having 3 the 3 second 3 support 3 rod 3 126 3 extending 3 axially 3 along 3 the 3 longitudinal 3 central 3 axis 3 a 3- 3 a 3 of 3 the 3 tubular 3 body 3 110 3 has 3 the 3 following 3 advantages 3 compared 3 to 3 simply 3 extending 3 the 3 first 3 support 3 rod 3 124 3: 3 3 because 3 the 3 second 3 support 3 bar 3 126 3 extends 3 axially 3 along 3 the 3 longitudinal 3 central 3 axis 3 a 3- 3 a 3 of 3 the 3 tubular 3 body 3 110 3, 3 the 3 diameter 3 or 3 radial 3 width 3 of 3 the 3 open 3 end 3 of 3 the 3 sealing 3 structure 3 120 3 is 3 not 3 too 3 large 3, 3 thereby 3 increasing 3 the 3 axial 3 coverage 3 area 3 along 3 the 3 tubular 3 body 3 110 3 but 3 avoiding 3 the 3 adverse 3 effect 3 on 3 the 3 resilience 3 of 3 the 3 plurality 3 of 3 first 3 support 3 bars 3 124 3 caused 3 by 3 the 3 excessive 3 diameter 3 or 3 radial 3 width 3 of 3 the 3 open 3 end 3 of 3 the 3 sealing 3 structure 3 120 3 simply 3 extending 3 the 3 first 3 support 3 bars 3 124 3. 3 Therefore, the plurality of second support rods 126 are arranged, so that the plugging area of the sealing structure 120 is obviously more attached to the edge of the gap, and the effect of avoiding intraoperative leakage is better achieved.

3 referring 3 to 3 fig. 3 7 3, 3 each 3 of 3 the 3 second 3 support 3 rods 3 126 3 is 3 disposed 3 parallel 3 to 3 the 3 longitudinal 3 central 3 axis 3 a 3- 3 a 3 of 3 the 3 tube 3 110 3, 3 such 3 that 3 the 3 plurality 3 of 3 second 3 support 3 rods 3 126 3 and 3 the 3 sealing 3 film 3 122 3 disposed 3 on 3 the 3 plurality 3 of 3 second 3 support 3 rods 3 126 3 form 3 a 3 tubular 3 structure 3 surrounding 3 the 3 tube 3 110 3. 3 Under the condition, the coverage area along the axial direction is larger, and the plugging effect is better. 3 3 3 it 3 3 3 will 3 3 3 be 3 3 3 appreciated 3 3 3 that 3 3 3 when 3 3 3 each 3 3 3 second 3 3 3 support 3 3 3 bar 3 3 3 126 3 3 3 is 3 3 3 disposed 3 3 3 parallel 3 3 3 to 3 3 3 the 3 3 3 longitudinal 3 3 3 central 3 3 3 axis 3 3 3 a 3 3 3- 3 3 3 a 3 3 3 of 3 3 3 the 3 3 3 tube 3 3 3 body 3 3 3 110 3 3 3, 3 3 3 the 3 3 3 angle 3 3 3 β 3 3 3 between 3 3 3 the 3 3 3 second 3 3 3 support 3 3 3 bar 3 3 3 126 3 3 3 and 3 3 3 the 3 3 3 first 3 3 3 support 3 3 3 bar 3 3 3 124 3 3 3 is 3 3 3 complementary 3 3 3 to 3 3 3 the 3 3 3 angle 3 3 3 α 3 3 3 between 3 3 3 the 3 3 3 first 3 3 3 support 3 3 3 bar 3 3 3 124 3 3 3 and 3 3 3 the 3 3 3 longitudinal 3 3 3 central 3 3 3 axis 3 3 3 a 3 3 3- 3 3 3 a 3 3 3 of 3 3 3 the 3 3 3 tube 3 3 3 body 3 3 3 110 3 3 3. 3 3 3

3 3 3 3 3 3 3 it 3 3 3 3 3 3 3 should 3 3 3 3 3 3 3 be 3 3 3 3 3 3 3 noted 3 3 3 3 3 3 3 that 3 3 3 3 3 3 3 in 3 3 3 3 3 3 3 other 3 3 3 3 3 3 3 embodiments 3 3 3 3 3 3 3, 3 3 3 3 3 3 3 each 3 3 3 3 3 3 3 second 3 3 3 3 3 3 3 support 3 3 3 3 3 3 3 bar 3 3 3 3 3 3 3 126 3 3 3 3 3 3 3 is 3 3 3 3 3 3 3 not 3 3 3 3 3 3 3 required 3 3 3 3 3 3 3 to 3 3 3 3 3 3 3 be 3 3 3 3 3 3 3 strictly 3 3 3 3 3 3 3 parallel 3 3 3 3 3 3 3 to 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 longitudinal 3 3 3 3 3 3 3 central 3 3 3 3 3 3 3 axis 3 3 3 3 3 3 3 a 3 3 3 3 3 3 3- 3 3 3 3 3 3 3 a 3 3 3 3 3 3 3 of 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 tube 3 3 3 3 3 3 3 body 3 3 3 3 3 3 3 110 3 3 3 3 3 3 3, 3 3 3 3 3 3 3 as 3 3 3 3 3 3 3 long 3 3 3 3 3 3 3 as 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 second 3 3 3 3 3 3 3 support 3 3 3 3 3 3 3 bar 3 3 3 3 3 3 3 126 3 3 3 3 3 3 3 extends 3 3 3 3 3 3 3 axially 3 3 3 3 3 3 3 along 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 longitudinal 3 3 3 3 3 3 3 central 3 3 3 3 3 3 3 axis 3 3 3 3 3 3 3 a 3 3 3 3 3 3 3- 3 3 3 3 3 3 3 a 3 3 3 3 3 3 3 of 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 tube 3 3 3 3 3 3 3 body 3 3 3 3 3 3 3 110 3 3 3 3 3 3 3, 3 3 3 3 3 3 3 and 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 second 3 3 3 3 3 3 3 support 3 3 3 3 3 3 3 bar 3 3 3 3 3 3 3 126 3 3 3 3 3 3 3 is 3 3 3 3 3 3 3 substantially 3 3 3 3 3 3 3 parallel 3 3 3 3 3 3 3 to 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 longitudinal 3 3 3 3 3 3 3 central 3 3 3 3 3 3 3 axis 3 3 3 3 3 3 3 a 3 3 3 3 3 3 3- 3 3 3 3 3 3 3 a 3 3 3 3 3 3 3 of 3 3 3 3 3 3 3 the 3 3 3 3 3 3 3 tube 3 3 3 3 3 3 3 body 3 3 3 3 3 3 3 110 3 3 3 3 3 3 3. 3 3 3 3 3 3 3 And β is greater than α. Thus, compared to the solution of omitting the second support rod 126 and simply extending the first support rod 124 while omitting the second support rod 126, a better sealing effect can be obtained.

It is understood that the first support bar 124 and the second support bar 126 may be integrally formed. Alternatively, the first support bar 124 and the second support bar 126 may be connected in a manner known to those skilled in the art, such as welding, gluing, and the like.

In one embodiment, the shape and the width of the second supporting bar 126 are respectively consistent with the shape and the width of the first supporting bar 124. In other embodiments, the shape and width of the second support bar 126 may not correspond to the shape and width of the first support bar 124. Alternatively, the second support bar 126 may be shaped identically to the first support bar 124, but not identical in width.

Referring to fig. 8, a plurality of branches 1262 are formed at an end of at least one of the second support rods 126 away from the tube 110 (not shown in fig. 8). The plurality of branches 1262 may or may not be equal in width. Also, the width of each branch 1262 is less than the width of the second support bar 126.

The plurality of branches 1262 are formed at the free end of at least one second support rod 126 of the sealing structure 120, so that the blocking effect is improved through the respective resilience performance of more thinner branches 1262 while the stability of the second support rod 126 is ensured, and the blocking of the inner cavity with a more complicated irregular shape can be realized, as shown in fig. 9.

In one embodiment, the number of the branches 1262 on each second support bar 126 is 2-8.

In one embodiment, the width of each branch is 0.02-0.15 mm.

Referring to fig. 8 again, in the present embodiment, each second support rod 126 is formed with 4 branches 1262, a free end of each branch 1262 extends axially along the tube 110 (not shown in fig. 8), and the four branches 1262 are on the same horizontal plane. The four branches 1262 are arranged at equal intervals in the circumferential direction of the pipe 110 (not shown in fig. 8). The end faces of the free ends of the branches 1262 on all of the second support bars 126 are in the same plane. With such an arrangement, the branches 1262 are distributed more densely, which is beneficial to improving the plugging effect of the sealing structure 120. Moreover, the branch 1262 is more stably connected with the second support rod 126, so that the branch 1262 is not easy to deform or incline, and a continuous plugging effect is favorably achieved. Meanwhile, the sheath is convenient to install, and the size of the sheath tube is not increased.

It is understood that in other embodiments, the number of branches on each second support bar 126 is not necessarily 4, and it is not required that the end surfaces of the free ends of all the branches 1262 on each second support bar 126 are located on the same plane, and it is not required that the branches 1262 are arranged at equal intervals along the circumference of the tube 110 (not shown in fig. 8), and the arrangement may be non-equal intervals. At the same time, it is not required that the end surfaces of the free ends of all the branches 1262 on all the second support bars 126 be on the same plane.

In one embodiment, the end surfaces of the free ends of all the branches 1262 on all the second support bars 126 are on the same plane, and the end surfaces of the free ends of all the branches 1262 are inclined surfaces, that is, the end surface of the open end of the sealing structure 120 is an inclined surface. When the luminal stent 100 and the stent graft 20 are implanted at a designated site in a blood vessel, if there is an angle between the luminal stent 100 and the stent graft 20, a portion of the sealing structure 120 may be caused to extend beyond the stent graft 20, which may create a risk of obscuring other branch blood vessels. The end surface of the open end of the sealing structure 120 is a slope, which can effectively avoid such a risk.

It should be noted that the end surface of the open end of the sealing structure 120 is a slope, and the length of the trunk and/or the branches 1262 of the first support rod 124 and the second support 126 can be adjusted. In one embodiment, in order to ensure a certain mechanical property, the lengths of the first support rods 124 are equal, the lengths of the stems of the second support rods 126 are equal, and the lengths of the branches 1262 are adjusted to make the end surface of the opening end of the sealing structure 120 an inclined surface.

In the plurality of second support bars 126, the branches 1262 may be formed at the free ends of some second support bars 126, and the branches 1262 are not formed at the free ends of some second support bars 126. In the second support rods 126 formed with the branches 1262, the number of the branches 1262 on each second support rod 126 may be equal to or different from the number of the branches 1262 on the other second support rods 126. The shape, width and spacing of the branches 1262 on each second support bar 126 may or may not be the same as the shape, width and spacing of the branches 1262 on the other second support bars 126. In summary, the specific arrangement of branches 1262 is not limited, as long as more complex, irregularly shaped lumen occlusion can be achieved, and the sheathing size of luminal stent 100 is not increased or not excessively increased.

In the sealing structure 120 shown in fig. 8, the first support rod 124 and the second support rod 126 are an integral structure. It is understood that in other embodiments, the first support bar 124 and the second support bar 126 may not be a unitary structure. The first support bar 124 and the second support bar 126 may be connected using any connection known to those skilled in the art, including but not limited to welding, gluing, etc. A plurality of branches 1262 may be formed at the free end of the second support rod 126 by laser cutting or the like.

The greater the number of the second support bars 126 on which the branches 1262 are formed, the greater the number of the branches 1262 formed on each second support bar 126, i.e., the greater the total number of the branches 1262, which indicates that the dark spots of the branches 1262 are denser as shown in fig. 9, the better the sealing effect. However, when the width of the branches 1262 is constant, the greater the number of branches 1262, the more difficult sheathing and delivery. Alternatively, when the width of branches 1262 is constant, the greater the number of branches 1262, the larger the size of the delivery sheath needed, resulting in delivery difficulties or difficulties in application to patients with smaller vessel diameters. When the number of branches 1262 is fixed, the larger the width of branches 1262, the same difficulties in sheathing and in delivery can occur; or may result in a larger size of the delivery sheath being required, resulting in delivery difficulties or difficulties in application to patients with smaller vessel diameters. However, as the width of the branches 1262 is smaller, i.e., the branches 1262 are thinner, the resilience of the branches 1262 is poor, resulting in poor sealing performance.

Therefore, when the number of the second support bars 126 forming the branches 1262 is small and the number of the branches on each second support bar 126 is small, for example, the number of the second support bars 126 forming the branches 1262 is 2 to 4 and the number of the branches on each second support bar 126 is 2 to 3, the width of the branches 1262 can be large to ensure a certain resilience. In one embodiment, branches 1262 have a width of 0.1-0.15 mm.

Therefore, when the number of the second support bars 126 forming the branches 1262 is large and the number of the branches on each second support bar 126 is large, for example, the number of the second support bars 126 forming the branches 1262 is 5 to 20 and the number of the branches on each second support bar 126 is 2 to 5, the width of the branches 1262 needs to be set small to ensure certain resilience without affecting the conveying performance. In one embodiment, branches 1262 have a width of 0.02-0.1 mm.

Therefore, in order to achieve the advantages of resilience, sheathing and transportation, in one embodiment, the number of the second support rods 126 on which the branches 1262 are formed is 5, the number of the branches 1262 on each second support rod 126 is 4, and the width of each branch 1262 is 0.05 to 0.1 mm.

Referring to fig. 8 again, in the present embodiment, the plurality of first supporting rods 124 and one of the corrugated rings 114 are an integrated structure. Specifically, the shape memory tubing may be cut by, for example, laser cutting, plasma arc cutting, etc. to form a plurality of first struts 124 and a single corrugated ring 114 in a single piece, i.e., the support structure of the seal structure 120 and the corrugated ring 114 are a single piece. In this embodiment, the wave ring 114 of the one-piece structure is still axially aligned with the other wave rings 114 of the tube body 110 to form a lumen structure. The main bodies of the branch 1262 and the second support bar 126, the first support bar 124 and the wave ring 114 connected to the first support bar 124 are an integral structure. In other embodiments, the first support bar 124 may be a unitary structure with one of the wave rings 114, and the second support bar 126 may be non-unitary with the first support bar 124 by welding, gluing, or the like.

The plurality of first support rods 124 and one of the wave rings 114 are of an integrated structure, so that the rebound resilience of the plurality of first support rods 124 is improved, the gap between the sealing structure 120 tightly attached to the lumen stent 100 and the covered stent 20 is facilitated, and the plugging effect is improved. Moreover, the manufacturing consistency of the sealing structure 120 is improved by means of laser cutting, plasma arc cutting and the like, the difficulty of winding the first supporting rod 124 on the corrugated ring 114 is reduced by integrating the first supporting rod 124 with the corrugated ring 114, and the process is easier to realize.

It will be appreciated that the outer diameter of the wave ring 114 in this one-piece construction is the same as the outer diameter of the other wave rings 114 of the tube body 110. The wave ring 114 of the one-piece construction may have parameters such as peak height, number of peaks and/or valleys, cross-sectional rod size, etc. that are equal to or different from the corresponding parameters of the other wave rings 114. When the corresponding parameters are equal or similar, it is beneficial to prevent the mechanical properties of the tube body 110 from being different.

It should be noted that, in this embodiment, since the first support rod 124 is of an integral structure with one of the wave rings 114, the total number of the other wave rings 114 of the tube body 110 should be 1 less than the total designed wave rings 114 of the lumen stent 100. For example, the total number of wave-shaped rings 114 in the design of the lumen stent 100 is 6, the number of wave-shaped rings 114 in the integrated structure is 1, and the total number of other wave-shaped rings 114 of the tube body 110 is 5.

It should also be noted that in this embodiment, the plurality of first support rods 124 are no longer independent of each other, and the wave ring 114 connected to the plurality of first support rods 124 connects the plurality of first support rods 124 together. This way can guarantee that seal structure 120 and body 110 are strictly coaxial, can avoid when the release form is relatively poor because seal structure 120's off-centre leads to the shutoff effect not good.

Referring again to fig. 3, in another embodiment, one end of each first supporting rod 124 is connected to one of the wave coils 114 of the tube 110 in a winding manner, and the first supporting rod 124 is connected to the tube 110. Specifically, one end of each of the plurality of first support rods 124 is wound on a valley of the same undulating ring 114, or one end of each of the plurality of first support rods 124 is wound on a peak of the same undulating ring 114. Due to the arrangement, on one hand, the first support rod 124 can be prevented from sliding on the corrugated ring 114, so that the first support rod 124 is favorably and reliably connected with the corrugated ring 114, and the structural stability of the lumen stent 100 is favorably ensured; on the other hand, during the manufacturing process, it is beneficial to ensure the consistency of the relative position of each first supporting rod 124 and the corrugated ring 114, thereby being beneficial to ensuring the production yield.

It is understood that the first support rod 124 can be connected to the tube 110 by other methods, such as welding, gluing, etc., as will be understood by those skilled in the art, on the premise that the first support rod 124 is reliably connected to the tube 110.

It should be noted that, no matter how large the included angle between the second support rod 126 and the first support rod 124 is, no matter how the connection manner between the second support rod 126 and the first support rod 124 is, the integrated connection or the non-integrated connection, and no matter how many the number of the second support rods 126 forming the branches 1262 is, the number of the branches 1262 is, the connection between the first support rod 124 and the tube 110 may be connected to one of the wave-shaped rings 114 of the tube 110 by winding or the like, or the connection between the first support rod 124 and one of the wave-shaped rings 110 of the tube 110 is an integrated structure.

It should be noted that, no matter how large the included angle between the second support rod 126 and the first support rod 124 is, no matter how the connection manner between the second support rod 126 and the first support rod 124 is integrated or non-integrated, no matter how many the number of the second support rods 126 forming the branches 1262 at the free ends is, and how many the number of the branches 1262 is, the size of the included angle α between the first support rod 124 and the longitudinal central axis of the tube 110, the larger the number of the first support rods 124, and the width of the first support rod 124 can be reasonably adjusted within the above-indicated range.

It should be noted that, no matter how large the included angle between the second support rod 126 and the first support rod 124 is, no matter how the connection manner between the second support rod 126 and the first support rod 124 is integrated or non-integrated, no matter how many the number of the second support rods 126 forming the branches 1262 at the free ends is, and how many the number of the branches 1262 is, the plurality of first support rods 124 may be arranged at equal intervals along the circumference of the tube 110. Alternatively, the plurality of first support rods 124 may also be arranged at unequal intervals along the circumferential direction of the tube body 110, for example, the plurality of first support rods 124 are arranged in a concentrated distribution area and a non-concentrated distribution area.

In addition, no matter how large the included angle between the second support rod 126 and the first support rod 124 is, no matter how the connection manner between the second support rod 126 and the first support rod 124 is connected integrally or non-integrally, and no matter how many the number of the second support rods 126 forming the branches 1262 at the free ends and the number of the branches 1262 are, the shapes of the first support rod 124 and the second support rod 126 are not limited as long as the first support rod 124 and the second support rod 126 are ensured to be rod-shaped structures with elasticity, and when the lumen stent 100 is released to a specified position in a blood vessel, the first support rod 124 and the second support rod 126 can rebound to enable the sealing structure 120 to better block the gap between the lumen stent 100 and the stent graft 20. Specifically, the first and second support bars 124 and 126 may be cylindrical bars, bars having a square cross section, bars having a rectangular cross section, profiled bars having an irregular cross section, threaded bars, or the like.

According to the lumen stent 100, the sealing structure 120 is arranged, so that when the lumen stent 100 is released to a specified part in a blood vessel, the plurality of first supporting rods 124 and the plurality of second supporting rods 126 of the sealing structure 120 can rebound to enable the sealing structure 120 to block a gap between the lumen stent 100 and the covered stent 20, the lumen stent 100 and the covered stent 20 can be matched perfectly, and internal leakage is avoided.

Moreover, the sealing structure 120 has a simple structure, weak mechanical properties and small irritation to the vessel wall, and is beneficial to avoiding long-term clinical risks.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A lumen support comprises a tube body and a sealing structure sleeved on the tube body, and is characterized in that the sealing structure comprises a sealing film, a plurality of first supporting rods and a plurality of second supporting rods, the plurality of second supporting rods correspond to the plurality of first supporting rods one to one, the plurality of first supporting rods are arranged at intervals along the circumferential direction of the tube body, one end of each first supporting rod is connected with the tube body, the other end of each first supporting rod is opposite to the longitudinal central axis of the tube body, the longitudinal central axis of the tube body extends in an inclined mode to enable the plurality of first supporting rods to be arranged in a radial mode, one end of each second supporting rod is connected with one end, far away from the tube body, of each first supporting rod, the other end of each second supporting rod extends in the axial direction of the longitudinal central axis of the tube body, at least one free end of each second supporting rod forms a plurality of branches, and the sealing film is wrapped on the plurality of first supporting rods and the plurality of second supporting rods, and one end of the sealing film, which is far away from the free end of the second supporting rod, is connected with the outer surface of the pipe body in a sealing manner.

2. The luminal stent as defined in claim 1 wherein the end surfaces of the free ends of the plurality of branches on each of the second support rods all lie in the same plane.

3. The luminal stent as defined in claim 1, wherein a plurality of branches are formed on the free ends of the plurality of second support rods, and the end surfaces of the free ends of all the branches are located on the same plane.

4. The luminal stent of claim 1 wherein the width of each of the branches is less than the width of the second support rod.

5. The luminal stent of claim 1 wherein the plurality of branches on each of the second support rods are arranged at equal intervals along the circumference of the tube body.

6. The luminal stent of claim 1 wherein the width of the branches is 0.02-0.15 mm.

7. The luminal stent of claim 1 wherein the number of branches on each of the second support rods is 2-8.

8. A luminal stent as claimed in any one of claims 1 to 7 wherein the second support rod is parallel to the longitudinal central axis of the tubular body.

9. A luminal stent as claimed in any one of claims 1 to 7 wherein the angle between each second support bar and the corresponding first support bar is between 20 ° and 90 °.

10. The tubular cavity stent as claimed in any one of claims 1 to 7, wherein the tubular body comprises a coating film and a plurality of wave-shaped rings, the wave-shaped rings are arranged along the axial direction, and the coating film is coated on the wave-shaped rings to form a tubular cavity structure.

11. The luminal stent of claim 10 wherein one end of each of the first support rods is connected to one of the undulating rings to connect a plurality of the first support rods to the tubular body.

12. The luminal stent of claim 11 wherein one end of each of the first support rods is connected with one of the undulating coils by wrapping so that a plurality of the first support rods are connected with the tubular body;

13. A luminal stent as claimed in any one of claims 1 to 7 wherein the length of each said first strut is in the range 2 to 25 mm.

14. A luminal stent as claimed in any one of claims 1 to 7 wherein the number of first support rods is 3 to 20.

15. A luminal stent as claimed in any one of claims 1 to 7 wherein the angle between each first support rod and the longitudinal central axis of the tubular body is between 10 ° and 90 °.

16. A luminal stent as claimed in any one of claims 1 to 7 wherein the width of the first support rod is 0.1 to 0.4 mm.

17. The luminal stent as claimed in any one of claims 1 to 7 wherein a plurality of the first support rods are arranged at equal intervals along the circumference of the tube body;

18. A luminal stent as claimed in any one of claims 1 to 7 wherein each said first support rod is coplanar with the longitudinal central axis of the tubular body; or,

19. A luminal stent as claimed in any one of claims 1 to 7 wherein there is no direct contact between the first support rods and there is no connecting member directly connected between any two first support rods in the first support rods.