CN120203862A

CN120203862A - Stent graft

Info

Publication number: CN120203862A
Application number: CN202311838003.8A
Authority: CN
Inventors: 唐江峰; 徐旸
Original assignee: Lifetech Scientific Shenzhen Co Ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2023-12-27
Filing date: 2023-12-27
Publication date: 2025-06-27

Abstract

The invention provides a tectorial membrane bracket, which comprises a main body bracket with a tubular main body, wherein the main body bracket axially comprises a proximal end section, a tumor cavity section and a distal end section, the proximal end section is connected with the proximal end of the tumor cavity section, the distal end section is connected with the distal end of the tumor cavity section, an inner iliac channel and an outer iliac channel which are arranged along the radial direction are arranged in the tumor cavity section, a first embedded bracket is arranged in the outer iliac channel, a second embedded bracket is arranged in the inner iliac channel, the first embedded bracket is communicated with the distal end section, an opening is arranged at the distal end of the tumor cavity section, the distal end of the second embedded bracket is communicated with the opening, the first embedded bracket and the second embedded bracket are arranged to separate the inner iliac channel and the outer iliac channel, the mutual influence between the smaller channels is reduced, and the radial supporting strength of the first embedded bracket and the outer iliac channel is larger than the radial supporting strength of the second embedded bracket and the inner iliac channel, so that when the tumor cavity section is pressed, the first embedded bracket has good supporting strength, small deformation and maintains better outer iliac channel and blood flow through the outer iliac channel.

Description

Tectorial membrane support

Technical Field

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

Background

In the prior art, in the treatment of the diseases of the iliac aneurysms, an iliac bifurcation stent and an iliac internal tectorial membrane stent can be implanted through an endoluminal treatment to reconstruct arterial blood vessels, the iliac bifurcation stent of the prior art is usually provided with two branch passages for reconstructing the iliac internal artery and the iliac external artery respectively, in order to ensure that the iliac internal artery passage is not blocked by the pressure closure of the blood vessels, the waveform design of the iliac internal artery passage can provide certain supporting strength, and in fact, the blood flow smoothness of the iliac external artery passage is far more important than that of the iliac internal artery passage, so that the general external iliac artery can ensure the blood flow smoothness through designing a larger lumen, but the vessel dissection requirement of a patient can be higher when the vessel lumen of the iliac external artery passage is overlarge, and the application range of the device is not beneficial to expansion.

Disclosure of Invention

Based on this, it is necessary to provide a novel stent graft that can shunt the flow of blood in the ilium and the flow of blood outside the ilium, while providing a better channel retention performance of the outer-iliac channel portion when pressed, and always maintaining a better blood flow passage.

A tectorial membrane support comprises a main body support body with a tubular main body, wherein the main body support body comprises a proximal end section, a tumor cavity section and a distal end section along the axial direction, the proximal end section is communicated with the distal end section through the tumor cavity section, an inner iliac channel and an outer iliac channel which are arranged along the radial direction are arranged in the tumor cavity section, a first embedded support is arranged in the outer iliac channel, a second embedded support is arranged in the inner iliac channel, the first embedded support is communicated with the distal end section, an opening communicated with the outside is arranged at the distal end of the tumor cavity section, the distal end of the second embedded support is communicated with the opening, and the support strength of the first embedded support and the outer iliac channel is larger than that of the second embedded support and the inner iliac channel.

In one embodiment, the external iliac passage receives the first embedded stent and the internal iliac passage receives the second embedded stent, the first embedded stent having a support strength greater than the support strength of the second embedded stent and/or the external iliac passage having a support strength greater than the support strength of the internal iliac passage.

In one embodiment, the first and second embedded stents comprise a mesh body and the tumor cavity section comprises a plurality of first wave rings disposed axially spaced apart.

In one embodiment, the wire diameter of the first embedded stent is greater than the wire diameter of the second embedded stent and/or the wire diameter of the first wave ring at the external iliac passage is greater than the wire diameter of the first wave ring at the internal iliac passage.

In one embodiment, the lattice density of the first embedded stent is greater than the lattice density of the second embedded stent and/or the wave angle of the first wave ring at the external iliac passage is greater than the wave angle of the first wave ring at the internal iliac passage.

In one embodiment, the outer iliac passage has an axial length that is greater than an axial length of the inner iliac passage, and the distal end of the second embedded stent includes an exposed segment that passes out of the opening.

In one embodiment, at least the first band of the outer iliac passage at the same axial position as the exposed segment is provided with a break, the break being directed towards the exposed segment.

In one embodiment, the proximal end of the tumor cavity section is provided with a transition band having a proximal diameter smaller than a distal diameter thereof.

In one embodiment, the body stent surface is covered with a first cover, the first and second embedded stents are covered with a second cover, and the first cover has a support strength greater than the support strength of the second cover.

In one embodiment, the distal segment and the proximal segment have a support strength that is greater than a total support strength of the tumor cavity segment and the first and second embedded stents.

In one embodiment, the distal segment or the proximal segment has a support strength that is greater than the total support strength of the tumor cavity segment and the first and second embedded stents.

Compared with the prior art, the invention provides a tectorial membrane bracket, which comprises a main body bracket with a tubular main body, wherein the main body bracket axially comprises a proximal end section, a tumor cavity section and a distal end section, the proximal end section is connected with the proximal end of the tumor cavity section, the distal end section is connected with the distal end of the tumor cavity section, the tumor cavity section is internally provided with an inner iliac channel and an outer iliac channel which are arranged along the radial direction, the outer iliac channel is provided with a first embedded bracket, the inner iliac channel is provided with a second embedded bracket, the first embedded bracket is communicated with the distal end section, the distal end of the tumor cavity section is provided with an opening, the distal end of the second embedded bracket is communicated with the opening, the inner iliac channel and the outer iliac channel are separated by the first embedded bracket and the second embedded bracket, the mutual influence between the smaller channels is arranged, so that the radial supporting strength of the first embedded bracket and the outer iliac channel is larger than the radial supporting strength of the second embedded bracket and the inner iliac channel, and the first embedded bracket has good supporting strength when the tumor cavity section is pressed, the inner iliac channel is deformed, and the outer iliac channel is better in blood flow through the outer iliac channel is ensured.

Drawings

FIG. 1 is a schematic view of the overall structure of a stent graft according to a first embodiment of the present invention;

FIG. 2 is a schematic view of a main body support according to a first embodiment of the present invention;

FIG. 3 is a schematic view of a structure of a built-in bracket according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a first wave ring angle distribution structure according to a first embodiment of the present invention;

FIG. 5 is a schematic view illustrating a first wave ring with a tapered wave angle according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating a first wave ring wire diameter distribution structure according to a first embodiment of the present invention;

FIG. 7 is a schematic view of a support structure with different lengths of a first wave ring according to a second embodiment of the present invention;

FIG. 8 is a schematic view of a supporting member with different heights for a first wave ring according to a second embodiment of the present invention;

FIG. 9 is a schematic view of a structure of a second embodiment of the present invention in which the support member is an elastic support member;

fig. 10 is a schematic structural diagram of a stent graft in another embodiment of the second embodiment of the present invention;

FIG. 11 is a schematic view of a main body support structure according to a third embodiment of the present invention;

FIG. 12 is a schematic view of a first wave ring with a fracture structure according to a third embodiment of the present invention;

FIG. 13 is a schematic view showing the overall structure of a stent graft in a fourth embodiment of the present invention;

FIG. 14 is a schematic view showing different wire diameters of a first embedded stent and a second embedded stent according to a fourth embodiment of the present invention;

FIG. 15 is an enlarged partial schematic view of the portion A of FIG. 14 in accordance with the present invention;

FIG. 16 is a diagram illustrating different lattice densities of a first stent graft and a second stent graft according to a fifth embodiment of the present invention;

Fig. 17 is a schematic view showing the different axial lengths of the inner and outer iliac passages of a tumor cavity segment in accordance with a sixth embodiment of the present invention.

FIG. 18 is a schematic view showing a flat-top structure of an exposed section of a second embedded bracket according to a sixth embodiment of the present invention;

FIG. 19 is a schematic view showing the structure of an exposed section of a second embedded bracket according to a sixth embodiment of the present invention;

FIG. 20 is a schematic view showing a structure of a proximal end wave ring with a variable diameter at a proximal end of a tumor cavity segment according to a sixth embodiment of the present invention;

FIG. 21 is a schematic view of another stent graft in accordance with the sixth embodiment of the present invention;

FIG. 22 is a schematic view of a stent graft in accordance with a seventh embodiment of the present invention;

FIG. 23 is a schematic view of a main body support structure according to a seventh embodiment of the present invention;

FIG. 24 is a schematic view showing different axial lengths of a first embedded bracket and a second embedded bracket according to a seventh embodiment of the present invention;

FIG. 25 is a schematic view of a triangular wave ring bracket according to a seventh embodiment of the present invention;

FIG. 26 is a schematic view of a structure in which developing members are disposed at two ends of a first embedded bracket and a second embedded bracket according to a seventh embodiment of the present invention;

FIG. 27 is a schematic view of a transition support structure using a wave ring according to a seventh embodiment of the present invention;

FIG. 28 is a schematic view of a transition stent with mesh woven stent structure according to a seventh embodiment of the present invention;

FIG. 29 is a schematic view of a special-shaped wave ring according to an eighth embodiment of the present invention;

FIG. 30 is a schematic view of a distal end high wave gradually lowering structure of a profiled wave ring in an eighth embodiment of the invention;

Fig. 31 is a schematic view of structures of a hook member and a hook rod in a ninth embodiment and a tenth embodiment of the present invention;

FIG. 32 is a schematic diagram of a stent delivery system according to a tenth embodiment of the present invention;

Fig. 33 is a schematic structural view of a stent graft in a conveyor according to a tenth embodiment of the present invention.

Detailed Description

In order that the inventive concept may be better understood, a detailed description of embodiments of the application will be presented below, taken in conjunction with the drawings, and the following detailed examples are merely illustrative of, and not limiting of, the application.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For purposes of more clarity in describing the structure of the present application, the terms "proximal" and "distal" are defined herein as terms commonly used in the interventional medical arts. Specifically, "distal" means the end of the blood vessel that is far from the heart, "proximal" means the end of the blood vessel that is near the heart, "axial" means the length direction thereof, "radial" means the direction perpendicular to the "axial direction," upper "and" lower "are the ends that are relatively far apart, and when one end is defined as" upper ", the other end that is far apart is" lower ".

Embodiment one:

Referring to fig. 1-2, the present invention provides a covered stent 100, where the covered stent 100 is generally composed of a metal framework and a covered material, the metal framework may be in a zigzag wave or woven mesh design, the covered material has a certain blood flow isolation capability, and is combined with the metal framework by means of pressure heating, suturing, etc. to form a complete covered stent 100, the proximal end of the covered stent 100 is generally placed in the common iliac artery or connected with the abdominal aortic stent, and the diameter of the lumen is generally matched with the diameter of the common iliac artery. In this embodiment, referring to fig. 1 and 3, the stent graft 100 has a main body stent 10 having a tubular main body and an embedded stent 20, the main body stent 10 is directly placed in a blood vessel to be in contact with the vessel wall, the embedded stent 20 is provided in the inner cavity of the main body stent 10 for the diversion of blood flow, the surface of the main body stent 10 is covered with a first stent graft 104, and the surface of the embedded stent 20 is covered with a second stent graft 202, wherein the main body stent 10 comprises a proximal end section 101 in the axial direction, a lumen segment 102 and a distal segment 103, the proximal segment 101 being connected to the proximal side of the lumen segment 102, the distal segment 103 being connected to the distal side of the lumen segment 102, the proximal segment 101 being in communication with the distal segment 103 through the lumen segment 102, the lumen segment 102 being generally disposed in the lumen of a vessel when the stent graft 100 is mounted in a diseased vessel, the lumen segment 102 being formed by an outer iliac passageway 1022 and an inner iliac passageway 1021 disposed in a radial direction, the radial width of the lumen segment 102 being generally greater than the diameter of the distal segment 103 and the diameter of the proximal segment 101, such that the inner iliac passageway 1021 and the outer iliac passageway 1022 in the lumen segment 102 have sufficient flow space to avoid total occlusion by extrusion of the lumen after implantation, the outer iliac passageway 1022 and the inner iliac passageway 1021 being isolated from two blood flow passageways, when in use, the outer iliac passageway 1022 being used to access the stent, the outer iliac passageway 1022 being used to connect the extended distal segment 103 with the outer iliac passageway, the inner stent graft being established with the outer iliac passageway, the inner passageway 1024 being disposed in a manner to be in the stent graft vessel, the inner passageway 20 being preferably in contact with the inner distal segment 1021, the inner passageway 20 being disposed in the stent graft segment 20 and being in contact with the inner passageway 20, the inner passageway being preferably in the proximal segment 20 and the inner passageway being in contact with the inner passageway 1021, the inner passageway 20 being disposed in the proximal segment having a shape to be connected to the inner passageway 20, the inner passageway 20 being in contact with the inner stent section of the inner stent 1021, and the inner passageway 20 being preferably in the inner passageway 20, can ensure that the part that embedded support 20 is connected with tumour chamber section 102 remains the laminating with tumour chamber section 102 of main part support 10 all the time, when tumour chamber section 102 receives the extrusion, laminating part can take place the deformation simultaneously along with the deformation of tumour chamber section 102 to effectively avoid when tumour chamber section 102 takes place to warp, embedded support 20 does not take place the deformation but only takes place the displacement at tumour chamber section 102 inner chamber, influences width and the trafficability characteristic of outer passageway 1022 of ilium.

In this embodiment, referring to fig. 1 and 2, in order to ensure that when the tumor cavity section 102 of the stent graft 100 is pressed, the inner iliac passage 1021 obtains a certain supporting property through the embedded stent 20, and simultaneously ensure that the outer iliac passage 1022 can keep a better shape and avoid being blocked by excessive pressing, the total supporting strength of the inner iliac passage 1021 and the embedded stent 20 of the tumor cavity section 102 of the stent graft 100 is smaller than the supporting strength of the outer iliac passage 1022, so that when the tumor cavity section 102 is pressed, the part with the small supporting strength preferentially deforms and the deformation amount is large, while the part with the large supporting strength slowly deforms and the deformation amount is limited, so that the outer iliac passage 1022 has a larger supporting strength and can ensure that the outer iliac passage 1022 is smaller under the condition of the same pressing force as the inner iliac passage 1021, and the inner iliac passage 1021 is preferentially deformed and the deformation amount is larger, so that the part of the tumor cavity section 102 is more deformed and is located in the inner iliac passage 1021, and the inner iliac passage 1022 is still connected with the inner iliac passage 20, and the inner iliac passage 1021 is still not deformed, and the shape of the inner iliac passage section 20 is kept basically unchanged.

In this embodiment, please refer to fig. 3, the embedded stent 20 has a mesh main body 201 and a second covering film 202, wherein the mesh main body 201 adopts a mesh-woven stent structure, the mesh supporting structure can provide better tension to provide better shape retention, and the mesh main body 201 can provide more contact points when the ilium inner stent is implanted, so that the ilium inner stent and the embedded stent 20 have larger friction force, can effectively enhance adhesion force and stent anti-slipping performance, please refer to fig. 2, the proximal section 101 is provided with a plurality of proximal supporting wave rings 1011 along the axial direction, the distal section 103 is provided with a plurality of distal supporting wave rings 1031 along the axial direction, the proximal supporting wave rings 1011 and the distal supporting wave rings 1031 both adopt Z-shaped annular wave rings to provide supporting force, and the Z-shaped annular wave rings can provide supporting force while the wave rings have a covering film gap between the wave rings, so that the stent can deform at the position of the covering film gap, and have good flexibility, wherein the diameter of the proximal supporting wave rings 1011 is larger than the diameter of the distal supporting wave rings 1031, so as to adapt to different diameters of the distal supporting wave rings. In other embodiments, the mesh body may also be formed by cutting a tubular metal, such as nitinol tube, stainless steel tube, or the like.

In this embodiment, the first covering film 104 is a PET film, the second covering film 202 is an ePTFE film, the PET film has the characteristics of high tensile strength, weak tensile strength, smooth surface, difficult thrombus formation, good long-term patency of small-sized blood vessels and small pores of the ePTFE film, the PET film and the ePTFE film are combined for use, the integral strength of the stent covering film is ensured, the stent 100 has a better effect of isolating blood flow, the patency of long-term branching is ensured, and the plugging effect is good, and the supporting strength of the first covering film 104 is greater than the supporting strength of the second covering film 202, so that the supporting strength of the covered film part of the outer iliac passage 1022 is greater than the supporting strength of the embedded stent 20 of the inner iliac passage 1021, and the embedded stent 20 is easy to deform compared with the outer iliac passage 1022, so that the embedded stent 20 is easy to deform along with the deformation of the inner iliac passage 1021.

In this embodiment, in order to make the stent graft 100 more easily compressed and have a smaller compression folding volume when mounted to the conveyor, the proximal support band 1011, the distal support band 1031 and the first band 1023 may be sewn to the surface of the first stent graft by stitching, specifically, when the proximal support band 1011, the distal support band 1031 and the first band 1023 are sewn, at least the peaks facing the proximal direction are not sewn to the first stent graft, so that when the stent graft 100 is folded and compressed, since the positions of the peaks are not limited by stitching, other sewing points can be slightly displaced to adapt to the folding of the stent graft and the deformation of the stent band, thereby making the stent graft folded better, and further, the non-sewn peaks can reduce the sewing ratio of the stent graft, so that the stent graft can have better flexibility to adapt to blood vessels having more complex bending degrees.

In this embodiment, referring to fig. 2, the tumor cavity segment 102 includes a plurality of first wave rings 1023 disposed at intervals along the axial direction, where the first wave rings 1023 are also Z-shaped annular wave rings, and in order to maintain better flexibility of the tumor cavity segment 102, the wave numbers of the plurality of first wave rings 1023 are the same, and the wave numbers of adjacent first wave rings 1023 are disposed opposite, where the wave numbers are the same, and the wave numbers and/or wave troughs are opposite, that is, the adjacent first wave rings 1023 are disposed approximately parallel, so that there is a uniform interval between the adjacent first wave rings 1023, and only through a covering film, so that flexibility is better, and is beneficial to the bending form of the blood vessel of the tumor cavity segment 102, preferably, the wave numbers of the first wave rings 1023 are the same as those of the proximal supporting wave rings 1011, and the wave numbers and/or wave troughs are disposed opposite, so that the tumor cavity segment 102 maintains better flexibility with the proximal segment 101 and the connection of the proximal segment 102.

In this embodiment, referring to fig. 4 and 5, in order to make the total support strength of the inner iliac passageway 1021 and the embedded support 20 smaller than that of the outer iliac passageway 1022, the same first wave loop 1023 of the tumor cavity 102 is disposed opposite to the wave angle (angle a in the figure) of the portion of the outer iliac passageway 1022 that is located at the same position than the wave angle (angle b in the figure) of the portion of the inner iliac passageway 1021 that is located at the same position of the same first wave loop 1023, because the force required for deformation of the wave with the larger wave angle is larger than that of the wave with the smaller wave angle when the wave loop is deformed, so the support strength is also larger than that of the wave with the smaller wave angle, and in some embodiments, in order to make the wave angles different, the wave height of the wave with the same wave number of the adjacent first wave loop 1023 is smaller than that of the wave with the portion of the outer iliac passageway 1022 that is located at the portion of the outer iliac passageway 1021 that is located at the same position than that of the wave angle (angle d in the figure) of the wave angle of the portion of the inner iliac passageway 1021 that is larger than that of the wave with the wave angle in the portion of the inner passageway 1021. In another embodiment, the wave height of all the waves of the first wave ring 1023 can be gradually increased from the outer iliac passage 1022 portion to the inner iliac passage 1021 portion, and the wave angle is gradually reduced, so that a structure with gradually reduced supporting strength is formed, and the gradual reduction of the supporting strength can avoid that the tumor cavity section 102 forms a larger supporting strength difference suddenly at the juncture of the outer iliac passage 1022 portion and the inner iliac passage 1021 portion, thereby causing unpredictable and unexpected deformation of the tumor cavity section 102 at the position.

In other embodiments, referring to fig. 6, in order to make the total supporting strength of the inner iliac passageway 1021 and the embedded support 20 smaller than that of the outer iliac passageway 1022, the wire diameter R1 of the portion of the first wave ring 1023 located in the outer iliac passageway 1022 may be made larger than the wire diameter R2 of the portion of the first wave ring 1023 located in the inner iliac passageway 1021, and the larger wire diameter needs to be subjected to larger force against the rigidity of the material itself when being deformed, so that the deformation amount of the wave ring with the larger wire diameter is smaller than that of the wave ring with the smaller wire diameter under the same stress condition, and thus the supporting strength is stronger.

In order to make the supporting strength of the portion of the inner iliac passage 1021 of the embedded stent 20 and the tumor cavity section 102 smaller than that of the portion of the outer iliac passage 1022, the embedded stent 20 is woven by metal braiding wires with smaller wire diameters, in this embodiment, the wire diameter D of the embedded stent 20 is smaller than one half of the wire diameter D of the first wave ring 1023 of the portion of the outer iliac passage 1022, that is, D is smaller than one half of D, and the wire diameter M of the first wave ring 1023 of the portion of the inner iliac passage 1021 is also smaller than one half of the wire diameter D of the first wave ring 1023 of the portion of the outer iliac passage 1022, so that the sum of the supporting strength of the embedded stent 20 and the portion of the inner iliac passage 1021 is always smaller than that of the portion of the outer iliac passage 1022, but the wire diameters of the first wave ring 1023 of the portion of the embedded stent 20 and the inner iliac passage 1021 of the application are not just set as described above, and the technician can adjust the wire diameters of the first wave ring 1023 of the portion of the embedded stent 20 and the inner iliac passage 1021 according to the actual stent requirement, so that the supporting strength and the portion of the inner iliac passage 1021 is smaller than the portion of the inner iliac passage 1022 can be ensured.

The support strength of the tumor cavity segment 102 at the proximal end and/or the distal end can be greater than that of the middle position, in one embodiment, the support strength of the first wave ring 1023 of the tumor cavity segment 102 at the proximal end and the distal end is greater than that of the first wave ring 1023 of the middle position, and in other embodiments, the support strength of the first wave ring 1023 of the tumor cavity segment 102 at the proximal end position can be greater than that of the first wave ring 1023 of the middle position, so that at least the support strength of the support at the blood inflow position can be ensured when the tumor cavity is formed by normal blood vessels, the first wave ring 1023 of the tumor cavity segment 102 at the proximal end and the distal end is provided with higher support strength, so that the extrusion from the junction position of the blood vessels and the tumor cavity can be better resisted, the middle position is further provided with lower support strength, so that the tumor cavity segment 102 has certain flexibility and better adapts to the shape of the blood vessels, and in other embodiments, the support strength of the first wave ring 1023 of the tumor cavity segment 102 at the proximal end position can be greater than that of the first wave ring 1023 of the middle position, so that the support angle of the support strength of the support at the support angle of the support at the position of the tumor cavity 102 at the blood inflow position can be realized, and the first wave ring 1023 can be more than that the angle of the wire at the end of the first wave ring 102.

In this embodiment, the supporting strength is specifically expressed as the deformation of the integral tubular lumen (the inner iliac passage 1021 and the outer iliac passage 1022) of the stent 100 after the tumor cavity segment 102 is pressed, that is, under the same stress condition, the inner iliac passage 1021 and the outer iliac passage 1022 are pressed with the same force (the force is required to deform both the inner iliac passage 1021 and the outer iliac passage 1022), the radial cross-sectional areas of the inner iliac passage 1021 and the outer iliac passage 1022 after the pressing are measured and calculated, the stent with a larger total cross-sectional area and a smaller total cross-sectional area has a supporting strength, and in some embodiments, the independently separated inner iliac passage 1021 and the independently separated outer iliac passage 1022 are compressed by a flat plate dynamometer, the force required for the compression is measured, the supporting strength is larger when the measured and the measured force is smaller when the measured, and the supporting strength is measured smaller when the measured is smaller when the measured and the measured force is always larger than the supporting strength is measured when the inner iliac passage 1021 is measured and the inner iliac passage 1022 is measured.

Embodiment two:

In this embodiment, please refer to fig. 7-9, the structure of the main body support 10 and the embedded support 20 is substantially the same as that of the first embodiment, and the difference is that the first waveguide 1023 includes a plurality of first waveguide 10232, the first waveguide 10232 are connected end to end at an angle to form a Z-shaped or M-shaped annular waveguide, a supporting member 10233 is disposed between the adjacent first waveguide 10232, the supporting member 10233 is connected to the first cover film 104 between the adjacent two first waveguide 10232 by stitching or bonding, when the adjacent two first waveguide 10232 are deformed by extrusion force, the two first waveguide 10232 perform compression movements close to each other around their waveguide angles, when the two first waveguide 10232 move to the position of the supporting member 10233, the two sides of the supporting member 10233 are respectively abutted against the two first waveguide 10232, the two first waveguide 10232 are prevented from continuing to move for compression, the extent of waveform deformation is limited, so as to provide supporting force, in order to make the first waveguide 1023 have a larger supporting strength than the first waveguide 10232 in the iliac channel, and the first waveguide 1023 can be compressed between the first waveguide 10232, and the first waveguide 10232 can be compressed by the compression distance between the two waveguide 10232 is reduced due to the fact that the first waveguide 1023 can be compressed by the compression distance between the two first waveguide 10232.

Referring to fig. 7 and 8, in one embodiment, in order to achieve the above effect, a gap 10234 may be provided between the support member 10233 and the adjacent first waveguide 10232, where the purpose of the gap 10234 is to provide a space for movable deformation between the first waveguide 10232 and the support member 10233, the larger the space is, the larger the degree of deformation of the waveform is, the lower the support strength is, whereas the smaller the gap 10234 is, the smaller the degree of deformation of the waveform is, the higher the support strength is, so that by providing the gap 10234 between the support member 10233 of the outer iliac channel 1022 portion and the adjacent first waveguide 10232 to be smaller than the gap 10234 between the support member 10233 of the inner iliac channel 1021 portion and the adjacent first waveguide 10232, the support strength of the first bezel 1023 obtained in the outer iliac channel 1022 portion is larger than the support strength obtained in the inner channel 1021 portion, and in such a setting that when the first bezel 1023 is subjected to the pressing force, the outer iliac channel 1022 portion of the first waveguide 1022 is located in the inner channel 1021 portion, the deformation of the first waveguide 1022 is further increased in the inner channel 1021 portion of the inner iliac channel 1022 portion than the inner channel 10232.

Referring to fig. 7 and 8, the supporting member 10233 may be a straight-shaped structure with two side ends, and in order to avoid the two side ends of the straight-shaped supporting member 10233 puncturing the covered blood vessel, the two ends may be bent to form a circular ring or the two ends may be formed with anti-damage heads, etc., not shown in the drawings, it is understood that the supporting members 10233 of the straight-shaped structure may be supporting members 10233 with the same length, respectively, disposed at different axial positions between the adjacent first waverods 10232, such as at the outer iliac passage 1022 portion, the supporting members 10233 with the same length are disposed at the near-wave angle position to provide a smaller gap 10234, and it is also understood that the supporting members 10233 of the straight-shaped structure may be supporting members 10233 with different lengths, respectively, disposed at the same axial positions between the adjacent first waverods 10232, such as at the outer iliac passage 1022 portion, the length of the supporting members 10233 is greater than at the inner iliac passage 1021 portion of the supporting members 10233 to provide a smaller gap 10234.

In another embodiment, referring to fig. 9, the supporting member 10233 is an elastic supporting member 10235, wherein two sides of the elastic supporting member 10235 are respectively connected to the adjacent first wave rods 10232, so that the degree of deformation of the adjacent first wave rods 10232 is determined by the degree of elastic deformation of the elastic supporting member 10235, when the degree of elastic deformation of the elastic supporting member 10235 is large, that is, the degree of deformation of the adjacent first wave rods 10232 is large, the supporting strength is low, and when the degree of elastic deformation of the elastic supporting member 10235 is small, that is, the degree of deformation of the adjacent first wave rods 10232 is small, the supporting strength is high, so that by setting the elastic modulus of the elastic supporting member 10235 of the outer iliac passage 1022 portion to be greater than the elastic modulus of the elastic supporting member 10235 of the inner iliac passage portion 1021, the elastic supporting member 10235 of the large elastic modulus provides a larger supporting force in the outer iliac passage 1022 portion, and vice versa.

In some embodiments, the elastic support 10235 may be a spring structure, and two sides of the spring structure are respectively connected to the first wave bars 10232 on two sides, and the elastic modulus of the spring structure of the part of the external iliac passage 1022 is set to be greater than the elastic modulus of the spring structure of the part of the internal iliac passage 1021.

In other embodiments, referring to fig. 9, the elastic support 10235 may be an elastic connection member with a spring member in the middle and connecting structures on both sides, where the total length of the middle spring member may be set to limit the deformation distance of the first waver rods 10232 on both sides, for example, the length of the spring member of the elastic connection member in the outer iliac channel 1022 portion is set to be smaller than the length of the spring member of the elastic connection member in the inner iliac channel 1021 portion, and the shorter spring member may provide a smaller degree of deformation than the longer spring member, so that the shorter spring member preferentially reaches the deformation limit than the longer spring member under the same stress, and provides a stable supporting force.

In other embodiments, referring to FIG. 10, the axial length of the tumor cavity segment 102 in the inner iliac passage 1021 portion and the embedded stent 20 is smaller than the axial length of the outer iliac passage 1022 portion so that the supporting position thereof when being pressed in the radial direction is reduced, and the area which can bear the pressure is small, thus, the supporting strength of the tumor cavity segment 102 in the inner iliac passage 1021 is smaller than the supporting strength of the outer iliac passage 1022;

In some embodiments, referring to fig. 10, the distal port and the opening 1024 of the stent 20 may be configured as a bevel, with the bevel being oriented away from the external iliac passageway 1022, and the bevel may also provide for a greater access opening of the stent when the stent 20 is implanted, reducing access difficulty, wherein the proximal port of the stent 20 is also configured as a bevel to increase the receiving area for blood access.

In one embodiment, the support 10233 is at least partially provided with a developing structure (not shown), and when the support 10233 is provided with a developing structure, the support 10233 may be shaped and configured with a mark recognition function, such as a letter-shaped support 10233 or a number-shaped support 10233, and the support 10233 may be entirely provided with a developing structure, and the preferable developing structure may be tantalum wire or gold wire.

Example III

In this embodiment, referring to fig. 11 and 12, the structure of the main body support 10 and the embedded support 20 is substantially the same as that of the first embodiment, except that the first wave ring 1023 is provided with a break 10231 at least at a portion of the intra-iliac channel 1021, it is understood that the first wave ring 1023 is provided with the break 10231 to form a C-shaped wave ring 1026, the first wave ring 1023 does not provide a supporting force at the location of the break 10231, and the break 10231 is provided at the intra-iliac channel 1021, such that the tumor cavity section 102 is covered only by a covering film at the location of the intra-iliac channel 1021, no supporting force of the intra-iliac channel 1021 is provided by the embedded support 20, and the supporting strength of the embedded support 20 is lower than that of the first wave ring 1023, such that the supporting strength of the tumor cavity section 102 at the intra-iliac channel 1021 is lower than that at the outer-iliac channel 1022.

In one embodiment, the fracture 10231 only covers the connection position of the embedded bracket 20 and the tumor cavity section 102, the two broken ends of the C-shaped wave ring 1026 are connected with two sides of the connection position of the embedded bracket 20 and the tumor cavity section 102, that is, the position where the inner iliac channel 1021 of the tumor cavity section 102 is only connected with the embedded bracket 20 does not have the first wave ring 1023 to provide supporting force, so that when the tumor cavity section 102 receives extrusion force, the connection part of the inner iliac channel 1021 and the embedded bracket 20 is preferentially deformed due to smaller supporting strength, thereby effectively avoiding the excessive influence of extrusion on the shape of the outer iliac channel 1022.

Referring to fig. 20, the C-shaped wave ring 1026 is located at two ends of the fracture 10231 and is wound around to form a circular ring structure 10261 or an anti-damage end, and the circular ring structure 10261 can store the end of the metal wire of the braided C-shaped wave ring 1026, so as to avoid the sharp end from puncturing the covering film to scratch the blood vessel.

Example IV

In this embodiment, referring to FIG. 13, the main body stent 10 and the embedded stent 20 have the same structure as in the first embodiment, except that the embedded stent 20 in the tumor cavity section 102 comprises a first embedded stent 21 and a second embedded stent 22 arranged along the radial direction, wherein the first embedded stent 21 is communicated with the distal end section 103, the distal end of the tumor cavity section 102 is provided with an opening 1024, and the distal end of the second embedded stent 22 is communicated with the opening 1024, wherein the tumor cavity section 102 comprises an inner iliac passage 1021 and an outer iliac passage 1022, the outer iliac passage 1022 accommodates the first embedded stent 21, and the inner iliac passage 1021 accommodates the second embedded stent 22;

the first embedded bracket 21 is arranged on the outer iliac channel 1022, the first embedded bracket 21 of the outer iliac channel 1022 can be provided with supporting force which resists the second embedded bracket 22 of the inner iliac channel 1021 when being extruded, so that the covered stent 100 can provide a better channel when the inner iliac bracket is implanted into the inner iliac channel 1021, and simultaneously can avoid the blocking of the outer iliac channel 1022 caused by the excessive extrusion of the inner iliac channel 1021 by the inner iliac channel 1021, so that the overall shape and smoothness of the double channels can be better maintained, wherein the blood inflow opening of the tumor cavity section 102 at the proximal end section 101 and the blood inflow opening of the outer iliac channel section 22 are occupied by the ports of the first embedded bracket 21 and the second embedded bracket 22 and the blood inflow opening of the outer iliac channel section 102 at the distal end section are respectively occupied by the proximal end section 21 and the distal end section 22, and the blood inflow opening of the inner iliac channel section 102 is shunted from the proximal end section 101 and the inner side of the inner embedded bracket 22.

In this embodiment, referring to fig. 14-16, in order to ensure the expanded form of the external iliac passage 1022 and ensure the smoothness of blood flow when the tumor cavity segment 102 is extruded or the stent is expanded, the present application sets the support strength of the portion of the tumor cavity segment 102 of the stent graft 100 that is wholly located in the external iliac passage 1022 to be greater than the support strength of the portion located in the internal iliac passage 1021, that is, the support strength of the first embedded stent 21 may be greater than the support strength of the second embedded stent 22 on the premise that the support strength of the tumor cavity segment 102 is uniform, or the support strength of the external iliac passage 1022 of the tumor cavity segment 102 may be greater than the support strength of the second embedded stent 22 on the premise that the support strength of the first embedded stent 21 is equal to the support strength of the second embedded stent 22, or the support strength of the first embedded stent 21 is greater than the support strength of the second embedded stent 22 and the support strength of the external iliac passage 1022 of the tumor cavity segment 102 is greater than the support strength of the internal iliac passage 1021.

In this embodiment, referring to fig. 14 and 15, the first embedded stent 21 and the second embedded stent 22 are provided with a mesh main body 201 and a surface second covering film 202, and the tumor cavity section 102 of the main body stent 10 includes a plurality of first wave rings 1023 arranged at intervals along the axial direction, so that the mesh main body 201 can provide better ductility, the surface second covering film 202 of the first embedded stent 21 and the surface second embedded stent 22 can be more smoothly opened, the local positions are prevented from being extruded and collapsed, and more supporting sites can be provided to collide with the implantation of the ilium inner stent, and the friction force is increased; by adjusting the wire diameters of the first and second embedded stents 21, 22, and adjusting the wire diameter of the first band 1023 at the outer iliac passage 1022 and the wire diameter of the first band 1023 at the inner iliac passage 1021, the portion of the stent graft 100 at the inner iliac passage 1021 and the portion of the outer iliac passage 1022 of the tumor cavity segment 102 can be provided with a support strength difference, it is understood that a larger stent wire diameter can provide a higher support performance, so that by making the wire diameter of the first embedded stent 21 larger than the wire diameter of the second embedded stent 22, and/or the wire diameter of the first band 1023 at the outer iliac passage 1022 larger than the wire diameter of the first band 1023 at the inner iliac passage 1021;

Referring to fig. 14, the wire diameter of the first embedded stent 21 is made larger than the wire diameter of the second embedded stent 22, and the wire diameter of the first wave ring 1023 located in the outer iliac passage 1022 is made larger than the wire diameter of the first wave ring 1023 located in the inner iliac passage 1021, the wire diameter of the first wave ring 1023 of the inner iliac passage 1021 is small, when the tumor cavity section 102 receives the extrusion force, the first wave ring 1023 of the inner iliac passage 1021 is deformed in preference to the first wave ring 1023 of the outer iliac passage 1022, thereby preferentially affecting the deformation of the second embedded stent 22 located in the inner iliac passage 1021, and the wire diameter of the second embedded stent 22 is smaller than the wire diameter of the first embedded stent 21, so that the support strength on the single-layer stent is distributed to the inner and outer two-layer stent, the support strength on the single stent is not too large, and simultaneously, the first wave ring 1023 of the inner iliac passage 1021 is reduced in preference to the first wave ring 1023 of the inner iliac passage section 102 and the second wave ring 1023 of the inner iliac passage 1021 are deformed in preference to the first wave ring 1023 of the outer iliac passage 1022, and the wire diameter of the single-layer stent is not too small, and the wire diameter difference of the single-layer stent is not too large is prevented from being too small, and the wire diameter difference is not being too large to be reduced, so that the wire diameter is difficult to be supported is difficult to be reduced.

Implement five kinds of

In this embodiment, referring to fig. 16, the structures of the main body stent 10 and the embedded stent 20 are substantially the same as those of the first and fourth embodiments, except that in this embodiment, by making the mesh density of the first embedded stent 21 larger than that of the second embedded stent 22, the support strength of the portion of the tumor cavity section 102 of the stent graft 100 entirely located in the external iliac passage 1022 is set to be larger than that of the portion located in the internal iliac passage 1021, specifically, the first embedded stent 21 and the second embedded stent 22 include the mesh main body 201 having a plurality of mesh structures, the higher the mesh density means that the number of required braided wires is increased, and the smaller the area of a single mesh is, the larger the mesh density can provide the greater support strength.

In this embodiment, please continue to refer to fig. 16, the first embedded bracket 21 and the second embedded bracket 22 have a woven diamond mesh structure, the first embedded bracket 21 has a first diamond mesh, the second embedded bracket 22 has a second diamond mesh, the first diamond mesh and the second diamond mesh have an upper peak and a lower peak in the axial direction, and have a left peak and a right peak in the radial direction, the space between the upper peak and the lower peak of the first diamond mesh is D1, and the space between the left peak and the right peak is L1. Preferably, D1 and L1 are smaller than D2 and L2, so that the area occupied by a single first diamond grid is smaller than that occupied by a single second diamond grid, and therefore, the first embedded bracket 21 has higher grid density and provides stronger supporting strength than the second embedded bracket 22 under the same bracket unfolding area.

In another embodiment, referring to fig. 16, at least L1 of the first diamond mesh may be made smaller than L2 of the second diamond mesh, so that the density of the first diamond mesh is changed only in the circumferential direction of the first embedded stent 21, and thus, the density of the first diamond mesh can be increased at least in the radial direction, thereby achieving the effect of enhancing the supporting strength in the radial direction.

In an embodiment, the wave angle of the first wave ring 1023 of the tumor cavity segment 102 at the part of the external iliac channel 1022 is larger than the wave angle of the first wave ring 1023 at the part of the internal iliac channel 1021, in another embodiment, the wave height of all waves of the first wave ring 1023 can be gradually increased from the part of the external iliac channel 1022 to the part of the internal iliac channel 1021 and the wave angle is gradually reduced, so that a structure with gradually reduced supporting strength is formed, and the gradual reduction of the supporting strength can prevent the tumor cavity segment 102 from forming a larger supporting strength difference at the junction of the part of the external iliac channel 1022 and the part of the internal iliac channel 1021, thereby leading to unpredictable and unexpected deformation of the tumor cavity segment 102 at the position. By simultaneously making the mesh density of the first embedded stent 21 greater than the mesh density of the second embedded stent 22 and the wave angle of the first wave ring 1023 located in the external iliac passage 1022 greater than the wave angle of the first wave ring 1023 located in the internal iliac passage 1021, and simultaneously setting the variation in the supporting strength on the first wave ring 1023 of the tumor cavity section 102 and the first embedded stent 21 and the second embedded stent 22, the problem of poor stent flexibility at a part of the positions which may be caused by the variation in the supporting strength only on the first embedded stent 21 and the second embedded stent 22 or the variation in the strength only on the first wave ring 1023 of the tumor cavity section 102 can be avoided.

It will be appreciated that by having the lattice density of the first embedded stent 21 greater than the lattice density of the second embedded stent 22, and/or the wave angle of the first wave ring 1023 at the external iliac passage 1022 greater than the wave angle of the first wave ring 1023 at the internal iliac passage 1021, the support strength of the portion of the tumor cavity section 102 of the stent graft 100 entirely at the external iliac passage 1022 can be set to be greater than the support strength of the portion at the internal iliac passage 1021.

Example six

In this embodiment, referring to fig. 17-19, the main body stent 10 and the embedded stent 20 are substantially the same as those of the first embodiment and the fourth embodiment to fifth embodiment, except that the supporting strength of the tumor cavity section 102 at the inner iliac passage 1021 and the outer iliac passage 1022 is changed by providing the inner iliac passage 1021 and the outer iliac passage 1022 of the tumor cavity section 102 with different axial lengths (H1 and H2 in fig. 17); specifically, the outer iliac passageway 1022 has an axial length H2 greater than the axial length H1 of the inner iliac passageway 1021, the tumor cavity section 102 has an axial length H2 at the outer iliac passageway 1022, the inner iliac passageway 1021 has an axial length H1, the length of H2 is greater than the length of H1 such that the outer iliac passageway 1022 of the tumor cavity section 102 has a length and contact area that are greater than the pressed length and contact area of the inner iliac passageway 1021 when pressed, thereby allowing better dispersion of pressure and providing better support performance and improved support strength, further referring to FIGS. 18 and 19, wherein the distal end of the second embedded stent 22 includes an exposed section 221 that extends out of the opening 1024, the exposed section 221 extends out of the inner iliac passageway 1021 such that the inner iliac passageway 1021 has a different distribution of support strength, the single-layer stent 22 is supported at the access end of the inner iliac stent such that there is better compliance at the location, thereby facilitating the inner iliac stent being selected to be more evenly spaced from the support opening, the distal end of the inner iliac stent 221 can be further placed in a direction away from the opening 1022, or a more stable manner when the distal end of the inner iliac stent is placed in a direction away from the opening, the insertion opening of the inner iliac support can be enlarged without enlarging the diameter of the second embedded support 22, so that the inner iliac support can be inserted more quickly and conveniently, the enlarged insertion opening can also improve the accuracy of inserting the inner iliac support, in some embodiments, the exposed section 221 is attached to the adjacent outer iliac channel 1022, the exposed section 221 can be a free end and can be separated from the outer iliac channel 1022, the inner iliac support can be implanted, the inner iliac support can be prevented from being folded and blocked due to excessive pressure at the position when being extended to an inner iliac blood vessel, the exposed section 221 can be fixedly connected with the side wall of the outer iliac channel 1022 in a sewing or bonding mode, and swing is avoided, so that the inner iliac support can be inserted more effectively.

Referring to fig. 18-19, since the second embedded stent 22 passes through the opening 1024 of the tumor cavity section 102, there is only a single-layer stent at the position of the opening 1024, and the supporting property is reduced more than other positions, in order to ensure that the tumor cavity section 102 of the stent 100 of the present application is easier to deform at the position of the inner iliac channel 1021 than at the position of the outer iliac channel 1022 when pressed, and avoid the compression blocking of the selected entrance of the exposed section 221, the stent supporting property of the portion of the outer iliac channel 1022 near the exposed section 221 is reduced, the first band 1023 of the outer iliac channel 1022 at least located at the same axial position as the exposed section 221 can be provided with a break 10231, forming a C-shaped band 1026, and the break 10231 faces the exposed section 221.

The same as in the third embodiment, the C-shaped wave ring 1026 is located at two ends of the fracture 10231 and is wound around to form a circular ring structure, and the circular ring structure can store the ends of the metal wires of the braided C-shaped wave ring 1026, so that the sharp ends are prevented from puncturing the tectorial membrane to scratch the blood vessel.

In this embodiment, referring to fig. 20, in order to better adapt to the shape of a diseased vessel by using the stent graft 100, a proximal end band 1025 is disposed at the proximal end of the tumor cavity section 102, the proximal end band 1025 at the proximal end of the tumor cavity section 102 is disposed with a diameter smaller than that of the distal end, so that the proximal end band 1025 has an inclined angle, and a stent structure with a narrow width is formed, so that the tumor cavity section 102 of the stent graft 100 forms a gradual transition structure from wide to narrow at the position adjacent to the proximal end section 101, so as to adapt to the change of the diameter of a normal vessel to the diseased vessel, and enhance the anchoring property between the proximal end section 101 and the vessel, so as to improve the stability of the stent graft 100 after implantation.

In other embodiments, referring to fig. 21, the proximal and distal ports of the first and second embedded brackets 21 and 22 may be respectively flat or beveled, for example, the proximal and distal ports of the second embedded bracket 22 are parallel beveled, and the proximal port of the first embedded bracket 21 is beveled, so that the second embedded bracket 22 may further form an unstable parallelogram structure to have offset support points in the radial direction, so that deformation is easy to occur when pressed to reduce the support strength, and the beveled arrangement of the proximal ports of the first and second embedded brackets 21 and 22 may form a larger blood inflow port to smoothly receive blood from the proximal segment.

In this embodiment, the surface of the main body support 10 is covered with the first cover film 104, the surface of the first embedded support 21 and the surface of the second embedded support 22 are covered with the second cover film 202, and the support strength of the first cover film 104 is greater than that of the second cover film 202, wherein the first cover film 104 adopts a PET film, the second cover film 202 adopts an ePTFE film, the change of the support strength of the first cover film 104 and the second cover film 202 mainly provides the characteristics of the material itself, the tensile strength of the PET film adopted by the first cover film 104 is usually between 50 and 200MPa, the better impact resistance is provided, the tensile strength of the ePTFE film adopted by the second cover film 202 is usually between 23 and 30MPa, and the impact on the blood can be reduced by adopting the first cover film 104 and the second cover film 202 with different tensile strengths, so that the support strength of the main body support 10 and the first embedded support 21 and the second embedded support 22 are different at the layer, the better matching the support strength of the support itself is provided, and the first embedded support 21 and the second embedded support 22 are provided, and the impact on the blood can be reduced.

In another embodiment, in order to better adapt the stent graft 100 to the diseased iliac artery, the supporting strength of the distal end section 103 and the proximal end section 101 of the stent graft 100 is set to be greater than the total supporting strength of the tumor cavity section 102 and the first and second stent grafts 21, 22, so that the stent graft 100 has better supporting strength at the position of the tumor cavity section 102, where the first and second stent grafts 21, 22 are arranged, as measured by the total supporting strength of the tumor cavity section 102, the first and second stent grafts 21, 22, and the supporting strength of the distal end section 103 and the proximal end section 101 of the stent graft 100 is set to be greater than the total supporting strength of the tumor cavity section 102, the first and second stent grafts 21, 22, so that the proximal and distal blood vessels of the stent graft 100 at the position of the vessel close to the diseased vessel have better supporting strength, the anchoring strength between the stent graft and the vessel is improved, and the anchoring strength between the stent graft 100 and the tumor cavity section 102 is prevented from being released from adhering to the position of the diseased vessel, and the better supporting strength is reduced. In other embodiments, the support strength of the distal section 103 or the proximal section 101 of the stent graft 100 is set to be greater than the total support strength of the tumor cavity section 102 and the first and second embedded stents 21, 22, and the greater support strength is set at either end of the proximal section 101 or the distal section 103 to provide better support anchoring properties at least at one end to ensure stability of the stent graft 100 during in vivo vessel anchoring in the event that the tumor cavity section 102 has better compliance.

In some embodiments, this can be accomplished by simultaneously reducing the support strength of the first and second embedded stents 21, 22 and the tumor cavity segment 102, such as by having the overall support strength of the first and second embedded stents 21, 22 be less than one-half the support strength of the proximal or distal segments 101, 103 and the support strength of the tumor cavity segment 102 be less than one-half the support strength of the distal or distal segments 103.

Example seven

In this embodiment, referring to fig. 22 and 23, the structures of the main body stent 10 and the embedded stent are substantially the same as those of the first embodiment and the fourth embodiment to the sixth embodiment, except that the main body stent 10 is provided with a supporting band at the proximal end section 101 and the distal end section 103, the tumor cavity covered film section 102 is not provided with the first band 1023, and is only covered with a film, and the inner cavity of the tumor cavity covered film section 102 is provided with the first embedded stent 21 and the second embedded stent 22, and the supporting performance is provided by the first embedded stent 21 and the second embedded stent 22; wherein the proximal end section 101, the tumor cavity covering film section 102 and the distal end section 103 of the main body stent 10 can be connected through the first covering film 104, the surfaces of the proximal end section 101 and the distal end section 103 are provided with supporting wave rings, the tumor cavity covering film section 102 is only provided with covering films, the proximal end section 101 and the tumor cavity covering film section 102 can be connected through a single piece covering film, the distal end section 103 is connected to the distal end of the external iliac passageway 1022 of the tumor cavity covering film section 102 through bonding or stitching, please refer to fig. 24, the first embedded stent 21 and the second embedded stent 22 comprise a net-shaped main body 201, the purpose of the net-shaped main body 201 is to emphasize better shape support, the net-shaped main body 201 can have better covering film tension than the supporting wave rings, so that even in the case of providing smaller weaving wire diameters, the tumor cavity covering film section 102 can also provide better covering film tension to keep the shape of a blood passageway, in the case that the first embedded stent 21 and the second embedded stent 22 are provided with smaller wire diameters, so that the whole shape of the whole body forming film covering film section 100 can be maintained in the shape of the external passageway 1022 is provided at the same time at the proximal end section 101 and the distal end of the external iliac passageway 1022, has better flexibility.

In this embodiment, referring to fig. 23-26, the first embedded stent 21 and the second embedded stent 22 are connected to the first covering film 104 of the tumor cavity covering film section 102 by bonding or stitching at least at the distal opening position of the distal end and the proximal opening position of the proximal end, wherein the blood inflow opening of the tumor cavity covering film section 102 at the proximal end and the blood outflow opening of the tumor cavity covering film section at the distal end are occupied by the proximal opening and the distal opening of the first embedded stent 21 and the second embedded stent 22, so that when blood flows into the tumor cavity covering film section 102 from the proximal end section 101, the blood flows into the tumor cavity covering film section 102 by the first embedded stent 21 and the second embedded stent 22, thereby avoiding internal leakage in the tumor cavity covering film section 102;

Referring to fig. 24, in order to improve the blood flow passing performance and make the tumor cavity covered membrane section 102 have better flexibility, the proximal ports of the first embedded stent 21 and the second embedded stent 22 are configured as inclined ports, wherein a first proximal inclined port 211 is disposed at the proximal end of the first embedded stent 21, a second proximal inclined port 222 is disposed at the proximal end of the second embedded stent 22, the first proximal inclined port 211 and the second proximal inclined port 222 are disposed opposite to each other, and the two inclined ports form a V-shaped section on an axial tangential plane; the dual-bevel arrangement of the first embedded stent 21 and the second embedded stent 22 can increase the carrying area of the blood inflow port at the position of the blood inflow port of the tumor cavity covered section 102 so that the inflow of blood is smoother, and the bevel arrangement can reduce the supporting points of the first embedded stent 21 and the second embedded stent 22 on two sides in the radial direction to a certain extent, thereby reducing the supporting strength in the radial direction, the supporting strength of the covered stent 100 on the tumor cavity covered section 102 is smaller than the supporting strength of the proximal section 101 and the distal section 103, and in general, the large bending side is an extended part and the small bending side is a compressed part when the stent is bent, the first proximal bevel 211 and the second proximal bevel 222 are arranged to be of a dual-bevel design which is oppositely arranged, so that the large bending side is positioned on one side of the longer extending length of the bevel of the first proximal bevel 211 or the bevel 222 when the covered stent 100 is bent, the small bending side is positioned on one side of the shorter extending length of the bevel, the first bevel 211 and the second bevel 222 is positioned on the right one side of the longer extending length of the bevel structure when the stent is bent, so that the covered stent 100 has better flexibility at least at the part of the tumor cavity covered section, and can effectively prevent the embedded stent from being bent in the tumor cavity covered section 102 when the covered stent 100 is bent.

In other embodiments, the first proximal bezel 211 and the second proximal bezel 222 may be configured to allow the major axis sidewall and the minor axis sidewall of the first embedded stent 21 and the second embedded stent 22 to be offset, so that when the stent graft 100 of the present application is compressed and placed in the delivery sheath, the major axis sidewall and the minor axis sidewall of the offset structure may allow the first embedded stent 21 and the second embedded stent 21 to be folded to have smaller volumes and be more easily delivered into the delivery sheath.

In this embodiment, please refer to fig. 24 and 26, the distal end opening of the first embedded support 21 is a bevel or a flat opening, the distal end opening of the second embedded support 22 is also a bevel or a flat opening, the distal blood outflow opening of the tumor cavity covered membrane section 102 is flush and attached to the distal end openings of the first embedded support 21 and the second embedded support 22, and is fixed by adhesion or stitching, wherein the distal end opening of the second embedded support 22 is provided with a second distal bevel 223, the distal end opening of the first embedded support 21 is provided with a first distal bevel 213 or a flat opening, please refer to fig. 26, when the distal end openings of the first embedded support 21 and the second embedded support 22 are set as bevel openings, the first distal bevel 213 and the second distal bevel 223 are parallel to the first proximal bevel 211 and the second proximal bevel 222 respectively, and the supporting forces of opposite sides of the non-rectangular parallel sides are smaller than the supporting forces of opposite sides of the rectangular sides, so that the parallel sides are provided with the bevel 21 and the second embedded support 22 are better in radial direction, and the radial direction of the second embedded support 22 can be better in terms of the radial direction, and the radial direction can be better in terms of the compression force of the flexible membrane section, and the radial direction can be better in the radial direction, and the radial direction can be better in the form, and the radial direction can be better in the compression stress, and the radial direction, and the pressure can be better in the form, and the stress can be better, and the stress and the pressure can be better, and the stress.

In another embodiment, referring to fig. 24, the distal end of the second embedded stent 22 is the second distal end bevel 223, and the distal end of the first embedded stent 21 is the first distal end flat 212, so that the axial length H3 of the side of the first embedded stent 21 away from the second embedded stent 22 is greater than the axial length H4 of the side of the second embedded stent 22 away from the first embedded stent 21, so that the first embedded stent 21 has more stent supporting positions to disperse the extrusion force from the blood vessel, thereby having better supporting strength than the second embedded stent 22;

Referring to fig. 25, when the distal port of the first embedded bracket 21 is configured as an inclined port, the supporting ring at the connection position of the distal segment 103 and the tumor cavity is configured as a triangle ring 1032 with a slope structure adapted to the first distal inclined port 213, wherein one side of the triangle ring 1032 has a wave height greater than that of the other side and is in a gradually decreasing structure, or a fracture is formed at one side of the low wave height.

In this embodiment, please refer to fig. 25, wherein the stent graft 100 further comprises a transition section 1027 connected between the proximal section and the lumen graft section 102, when the proximal ports of the first and second embedded stents 21, 22 are configured as dual-bevel, the transition section 1027 is located between the proximal end of the lumen graft section 102 and the first and second proximal bevel 211, 222, wherein the transition section 1027 is provided with a transition stent 10271, and the transition stent 10271 is capable of supporting the coating of the transition section 1027 formed between the dual-bevel, thereby avoiding collapse or poor release caused by lack of a support structure at the location of the lumen graft section 102.

In this embodiment, referring to fig. 27-28, the transition stent 10271 is separately disposed on the transition section 1027, and the shape of the transition stent 10271 is adapted to the shape of the transition section 1027, where, since the distal end of the proximal section 101 near the supporting band of the tumor cavity coating section 102 is a flat port with uniform wave height, and a V-shaped port is formed between the first proximal bezel 211 and the second proximal bezel 222, the proximal end and the distal end of the transition stent 10271 are respectively flush with the proximal end of the tumor cavity coating section 102 and the first proximal bezel 211 and the second proximal bezel 222, the proximal end of the transition stent 10271 includes a flat port, and the distal end includes a convex V-shaped protrusion.

In some embodiments, the transition support 10271 may be an annular support or a single sheet support, when the transition support 10271 is configured as an annular support, at least two V-shaped protrusions are symmetrically disposed on two sides of the annular support and are used for matching with V-shaped opposite openings formed by the first proximal bevel 211 and the second proximal bevel 222, the annular support can provide better overall support performance, support can be provided in the transition section 1027 area, support can be provided at the junction part of the proximal section 101 and the tumor cavity covering section 102, so that the connection of the covering membrane support 100 at the transition position of the proximal section 101 and the tumor cavity covering section 102 is more stable, when the transition support 10271 is configured as a single sheet support, at least two sheet supports are disposed symmetrically on two sides of the V-shaped opposite openings formed by the first proximal bevel 211 and the second proximal bevel 222, the proximal side of the single sheet support is a flat side, the distal side of the single sheet support is a V-shaped side gradually lowered on two sides of the middle, and the single sheet support 1027 support can directly provide better support performance between the transition section 101 and the tumor cavity covering section 102 at the transition section 1027.

In one embodiment, referring to fig. 27 and 28, the transition stent 10271 is a balloon-type stent with a Z-shaped or W-shaped woven structure, and is similar to the proximal supporting balloon 1011 of the proximal section 101 in the form of a balloon-type stent, so that the proximal section 101 has a better connection at the position, thereby improving the flexibility of the whole stent graft 100, and in another embodiment, the transition stent 10271 is a mesh-type woven stent with a mesh-type woven structure, and the structure of the mesh-type woven stent is similar to the structures of the first embedded stent 21 and the second embedded stent 22, so that the integrity of the tumor cavity stent graft 102 is higher, the supporting tension of the mesh-type woven stent is stronger, the inner wall is smoother, and the smoothness of blood flow at the position can be further ensured.

Example eight

In this embodiment, please refer to fig. 29 and 30, the structures of the main body stent 10 and the embedded stent 20 are generally the same as those of the seventh embodiment, except that the transition stent 10271 is not separately arranged, at least two special-shaped bands 1012 are arranged at the distal end of the proximal end section 101, a part of each special-shaped band 1012 extends to the inside of the tumor cavity coated section 102 to form a supporting structure in the transition section 1027 so as to form a transition stent 10271, the proximal end of a specific special-shaped band 1012 has uniform equal-height proximal end waves 102711, the distal end comprises a plurality of distal end high waves 102712 with unequal heights, the distal end high waves 102712 are protruded towards the distal end, the peaks are flush with the first proximal inclined opening 211 and the second proximal inclined opening 222 of the first embedded stent 21 and the second embedded stent 22 so as to support the transition section 1027, the distal end high waves 102712 of the special-shaped band 1012 are at least two, the two distal end high waves 102712 of the special-shaped band 1012 are symmetrically arranged at two sides along the diameter of the special-shaped band 1012, the two distal end high waves 102712 are close to the bottom of the opening V-shaped band 1012, the top surface of the special-shaped band 1012 is further arranged at the bottom of the top of the special-shaped band 1012, the top band 1023 is further arranged at the position of the opposite to the proximal end section 101, the middle section 101 is further flush with the first proximal end inclined opening 211 and the second inclined opening 222 is formed between the first proximal end of the first proximal end section 21 and the second proximal end inclined opening 211 and the second proximal end inclined opening 222, and the middle section 1027 is supported by the special-shaped band 1027, and the special-shaped band 1027 is at the same.

Example nine

In this embodiment, the structures of the main body stent 10 and the embedded stent 20 are substantially the same as those in the seventh embodiment, except that the distal end section 103 of the main body stent 10 and the tumor cavity covered membrane section 102 are fixed after being spliced by bonding or stitching, the surface of the main body stent 10 is provided with a first covered membrane 104, the surface of the embedded stent 20 is provided with a second covered membrane 202, the first covered membrane 104 is a PET membrane, the second covered membrane 202 is an ePTFE membrane, and the distal end section 103 and the tumor cavity covered membrane section 102 are arranged in a spliced manner, so that the surface covered membrane of the distal end section 103 also adopts an ePTFE membrane, thereby further ensuring the patency of the blood flow of the external iliac blood vessel.

In one embodiment, the first embedded stent 21 and the distal end section 103 are integrally formed, the distal end section 103 extends directly into the tumor cavity covered membrane section 102 and is sutured with the tumor cavity covered membrane section 102, the part of the external iliac channel 1022 located in the tumor cavity covered membrane section 102 forms the first embedded stent 21, the part of the external iliac channel 1022 located outside the tumor cavity covered membrane section 102 forms the distal end section 103, thus, the stent body integrally formed by the first embedded stent 21 and the distal end section 103 can adopt a band stent or a net-shaped woven stent, the surface covered membrane adopts an ePTFE membrane, the integral forming means that the first embedded stent 21 and the distal end section 103 are formed on the same ePTFE covered membrane, the integral formed stent does not have an adhesive structure or a suture structure, and when blood flows into the external iliac channel 1022, the smoothness of the inner wall of the external iliac channel is influenced by no barrier or bulge generated by the splicing structure in the channel, and the smoothness of the inner wall of the external iliac channel can be effectively improved.

In this embodiment, referring to fig. 26, the proximal end port and/or the distal end port of the first embedded bracket 21 and the second embedded bracket 22 are provided with a developing member 203, and the proximal end port and the distal end port of the first embedded bracket 21 and the second embedded bracket 22 are provided with the developing member 203, so that the arrangement of the developing member 203 can help an operator to quickly locate the position of the tumor cavity covered section 102, the relative position of the inner iliac passage 1021 and the outer iliac passage 1022 and the shape change after compression by the developing device, and can also help the operator to quickly locate the selected position of the inner iliac bracket so as to realize quick and accurate implantation of the inner iliac bracket.

In this embodiment, referring to fig. 31, in order to achieve that the stent graft 100 provided by the present invention can still achieve fine adjustment of the release position when the position is inaccurate after the initial release in the blood vessel is completed, a plurality of hooking members 1013 are provided on the proximal section 101 of the main body stent 10, the hooking members 1013 are provided in a plurality and are arranged along the axial direction of the proximal section 101, and at least two hooking members 1013 are provided at the same axial position, so that after the two hooking members 1013 at the same axial position can be pulled to the same position, the hooking members 1013 at different axial positions are hooked on the hooking rod 30, at least a part of the proximal section 101 of the stent graft 100 can be at least partially contracted and bound, so that after the stent graft is released from the catheter of the conveyor for the first time, the stent graft 30 is completely released again after the release position is inaccurate, wherein the hooking members 1013 can be ring-shaped hooks made of polymer material, such as ring-shaped material, and can be fixed on the proximal end of the proximal section 1011 or the proximal end of the stent graft by bonding wire or the proximal section of the proximal section 1011.

Examples ten

In this embodiment, please refer to fig. 32-33, a stent delivery system 1000 is provided, the stent delivery system 1000 includes the stent graft 100 provided in embodiment one to embodiment nine, and further includes a conveyor 200, the conveyor 200 is used for delivering the stent graft 100 of the present application to a designated vascular site and releasing, wherein the conveyor 200 generally includes a delivery sheath 2001 and a delivery handle 2002, the delivery handle 2002 is used for controlling the advancing and retreating of the delivery sheath 2001 to release the stent from the delivery sheath 2001, please refer to fig. 31, wherein the delivery sheath 2001 includes a hanging rod 30, and the hanging rod 30 is used for hooking a hooking member 1013 on a proximal section 101 of the stent graft 100, such that at least the proximal section 101 of the stent graft 100 is in a semi-constrained state after hooking.

In this embodiment, at least the inner iliac passage 1021 of the tumor cavity covered stent 100 is provided with a preset guide wire 40, and the preset guide wire is pre-placed in the covered stent 100 after the production of the covered stent 100 is completed, so that the guide wire does not need to be re-fed after the stent is released, and the operation of introducing and selecting the guide wire can be reduced by arranging the preset guide wire 40 in the inner iliac passage 1021 of the tumor cavity covered stent 102, and the inner iliac stent can be quickly guided into the first embedded stent 21 of the inner iliac passage 1021 to be released directly through the guide of the preset guide wire 40, thereby improving the releasing accuracy and simultaneously reducing the operation time.

The above specific embodiments are only some embodiments of the present invention, and not limiting, and the present disclosure is not intended to be exhaustive or to limit all embodiments of the inventive concept, and some features of the above different embodiments may be replaced with each other or combined, and those skilled in the art may simply replace the features according to the actual needs, so that the inventive concept is subject to the scope of protection claimed.

Claims

1. A coated stent, characterized in that it comprises a main body stent with a tubular body, the main body stent comprising a proximal section, a tumor cavity section and a distal section in the axial direction; the proximal section is connected with the distal section through the tumor cavity section; an internal iliac channel and an external iliac channel arranged radially are provided in the tumor cavity section, the external iliac channel is provided with a first embedded stent, the internal iliac channel is provided with a second embedded stent, the first embedded stent is connected with the distal section; an opening connected with the outside is provided at the distal end of the tumor cavity section, and a distal port of the second embedded stent is connected with the opening; the supporting strength of the first embedded stent and the external iliac channel is greater than the supporting strength of the second embedded stent and the internal iliac channel.

2. The coated stent according to claim 1 is characterized in that the external iliac channel accommodates the first embedded stent, the internal iliac channel accommodates the second embedded stent, the support strength of the first embedded stent is greater than the support strength of the second embedded stent and/or the support strength of the external iliac channel is greater than the support strength of the internal iliac channel.

3. The coated stent according to claim 2 is characterized in that the first embedded stent and the second embedded stent comprise a mesh body, and the tumor cavity segment comprises a plurality of first wave rings spaced apart in the axial direction.

4. The coated stent according to claim 3 is characterized in that the wire diameter of the first embedded stent is larger than the wire diameter of the second embedded stent, and/or the wire diameter of the first wave coil located at the external iliac channel is larger than the wire diameter of the first wave coil located at the internal iliac channel.

5. The coated stent according to claim 3 is characterized in that the grid density of the first embedded stent is greater than the grid density of the second embedded stent, and/or the wave angle of the first wave coil at the external iliac channel is greater than the wave angle of the first wave coil at the internal iliac channel.

6 . The coated stent according to claim 3 , characterized in that the axial length of the external iliac channel is greater than the axial length of the internal iliac channel, and the distal end of the second embedded stent includes an exposed segment, and the exposed segment passes through the opening.

7. The coated stent according to claim 6, characterized in that the first wave ring located at at least the same axial position of the external iliac channel as the exposed segment is provided with a fracture, and the fracture faces the exposed segment.

8. The coated stent according to claim 1 is characterized in that a transition wave ring is provided at the proximal end of the tumor cavity segment, and the proximal diameter of the transition wave ring is smaller than the distal diameter thereof.

9. The coated stent according to claim 1 is characterized in that the surface of the main stent is covered with a first coating, the surfaces of the first embedded stent and the second embedded stent are covered with a second coating, and the support strength of the first coating is greater than the support strength of the second coating.

10. The coated stent according to any one of claims 1-9, characterized in that the support strength of the distal segment and the proximal segment is greater than the total support strength of the tumor cavity segment, the first embedded stent, and the second embedded stent.

11. The coated stent according to any one of claims 1-9, characterized in that the support strength of the distal segment or the proximal segment is greater than the total support strength of the tumor cavity segment, the first embedded stent, and the second embedded stent.