Lumen stent

Abstract

The application provides a lumen stent, comprising: a main stent and a branch stent, the main stent comprises a tubular attachment section, the attachment section comprises a first region and a second region connected with the first region in the circumference direction, the branch stent is arranged in the lumen of the attachment section and connected with the first region, and the axial shortening rate of the first region is less than that of the second region. Compared with the prior art, the lumen stent of the application can reduce the shortening degree of the main stent driven by the branch stent.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to a lumen stent. Background Technology

[0002] Minimally invasive interventional procedures are currently available for treating vascular diseases. These methods are minimally invasive, highly safe, and highly effective, thus gaining acceptance from both doctors and patients and becoming an important treatment option for vascular diseases. Interventional treatment involves implanting a vascular stent into the diseased segment of the blood vessel using a delivery system. The implanted stent can expand to support the narrowed or occluded segment of the vessel or seal any ruptures in the blood vessel, reducing elastic recoil and remodeling of the vessel, maintaining unobstructed blood flow, and preventing restenosis.

[0003] For endovascular treatment of aortic aneurysms or dissections involving branch arteries, bridging stenting techniques have become the current trend in treating aortic dissections or aortic aneurysms involving branch arteries due to their advantages such as low postoperative endoleak, good stent integrity, and continuous blood supply to the branch arteries during implantation. Bridging stenting techniques can be divided into branch stenting and external bridging stenting techniques based on the positional relationship of the bridging stent relative to the main stent. Among these, branch stenting techniques are easier to assemble and have relatively lower surgical difficulty, making them a current research focus.

[0004] Existing branch stents are fixed to the inner wall of the main stent by sutures. For example, sutures run from one end of the branch stent to the other to ensure that the entire branch stent is tightly attached to the inner wall of the main stent. After the stent is implanted into the target position, during the retraction of the delivery device from the proximal end to the distal end, some components of the delivery device (e.g., the tip head) may snag on the branch stent, causing the branch stent to shorten the main stent. Summary of the Invention

[0005] This invention provides a luminal stent, the purpose of which is to reduce the degree to which the branch stent causes shortening of the main stent. This objective is achieved through the following means:

[0006] The present invention proposes a lumen stent, comprising: a main stent and a branch stent. The main stent includes a tubular attachment segment, the attachment segment including a first region and a second region connected to the first region in the circumferential direction. The branch stent is disposed in the lumen of the attachment segment and connected to the first region. The axial shortening ratio of the first region is less than the axial shortening ratio of the second region.

[0007] In one embodiment, the first region includes a plurality of axially arranged first waveform units, and the second region includes a plurality of axially arranged second waveform units, wherein the shortest axial distance between two adjacent first waveform units is less than the shortest axial distance between two adjacent second waveform units.

[0008] In one embodiment, the wave height of the first waveform unit is greater than the wave height of the second waveform unit.

[0009] In one embodiment, the first region includes adjacent proximal first waveform units and distal first waveform units, the proximal first waveform unit including a first proximal trough, the distal first waveform unit including a first distal peak, at least one first proximal trough opposite to a first distal peak, and the line connecting the first distal peak and the first proximal trough is approximately parallel to the axis of the main support.

[0010] In one embodiment, the second region includes a proximal second waveform unit and a distal second waveform unit. The proximal second waveform unit includes a plurality of second proximal troughs located in different radial planes, and the distal second waveform unit includes a plurality of second distal peaks located in different radial planes. The second proximal troughs that are closer to the first region in the circumferential direction are closer to the proximal end of the main support, and / or the second distal peaks that are closer to the first region in the circumferential direction are closer to the distal end of the main support.

[0011] In one embodiment, the wave height of the first waveform unit is approximately equal to the wave height of the second waveform unit, and adjacent first waveform units have opposite phases, while adjacent second waveform units have the same phase or a phase difference.

[0012] In one embodiment, the first region includes a plurality of axially arranged first waveform units, and at least one first elastic element is provided between adjacent first waveform units.

[0013] In one embodiment, the branch support has a proximal port that is movable relative to the main support.

[0014] In one embodiment, the lumen stent further includes a second elastic member disposed between the inner surface of the main stent and the inner surface of the branch stent. The second elastic member is elastic and is used to limit the range of motion of the proximal port of the branch stent.

[0015] In one embodiment, at least one of the branch supports is provided with a straight or curved support wire, one end of which is closer to the proximal end of the branch support than the other end.

[0016] In one embodiment, the support wire is located on the outer or inner surface of the branch support.

[0017] In one embodiment, the proximal end of the support wire extends beyond the proximal port of the branch support.

[0018] In one embodiment, the main support includes a main cover and at least one main corrugated coil disposed within the main cover. When the lumen support is in a naturally deployed state, the proximal end of the support wire abuts against the main corrugated coil.

[0019] The lumen stent of the present invention, because the branch stent is connected to the first region with a low axial shortening rate, can greatly reduce the shortening degree of the main stent even if the main stent is driven by the branch stent. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Wherein:

[0021] Figure 1 This is a schematic diagram of the structure of a lumen support according to an embodiment of the present invention;

[0022] Figure 2 This is a top view of the attachment segment in one embodiment of the present invention;

[0023] Figure 3 This is a front view of the attachment segment in one embodiment of the present invention;

[0024] Figure 4 for Figure 2 A schematic diagram of the planar development of a pair of main wave loops in the middle attachment section;

[0025] Figure 5 This is a planar unfolded schematic diagram of a pair of main wave loops of the attachment segment in another embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the branch support structure in one embodiment of the present invention;

[0027] Figure 7 for Figure 6 Side view of the transition section of the middle branch support;

[0028] Figure 8 This is a front view of the attachment segment in another embodiment of the present invention;

[0029] Figure 9 for Figure 8 A schematic diagram of the planar development of a pair of main wave loops in the middle attachment section;

[0030] Figure 10 This is a planar unfolded schematic diagram of a pair of main wave loops of the attachment segment in another embodiment of the present invention;

[0031] Figure 11This is a schematic diagram of the branch support structure in another embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the support wire of the branch bracket in another embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of the structure of the first elastic element in one embodiment of the present invention;

[0034] Figure 14 This is a schematic diagram of the structure of the first elastic element in another embodiment of the present invention;

[0035] Figure 15 This is a schematic diagram of the connection position of the second elastic element in one embodiment of the present invention;

[0036] Figure 16 for Figure 15 Schematic diagram of the structure of the second elastic element;

[0037] Figure 17 This is a schematic diagram of the connection position of the second elastic element in another embodiment of the present invention;

[0038] Figure 18 This is a schematic diagram of the connection position of the second elastic element in another embodiment of the present invention;

[0039] Figure 19 This is a schematic diagram of the structure of the second elastic element in another embodiment of the present invention;

[0040] Figure 20 This is a schematic diagram of the structure of the second elastic element in another embodiment of the present invention. Detailed Implementation

[0041] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. These embodiments are provided so that this invention will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.

[0042] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0043] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0044] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0045] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end from which blood flows out, and "proximal" refers to the end from which blood flows in. For example, after stent implantation, blood flows from the proximal end of the stent toward the distal end; "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction.

[0046] The "wave loop" in this invention is a closed ring structure, also known as a wave-shaped ring, made of woven or cut metallic elastic material. This metallic elastic material includes known materials used in implanted medical devices or combinations of various biocompatible materials, such as alloys of two or more single metals selected from cobalt, chromium, nickel, titanium, magnesium, and iron, as well as 316L stainless steel, nickel-titanium-tantalum alloys, or other biocompatible metallic elastic materials. The wave loop has radial expansion capability, allowing it to radially contract under external force and recover its initial shape and maintain it after the external force is removed, either by self-expansion or mechanical expansion (e.g., balloon inflation). Thus, after implantation into a lumen, its radial support force allows it to adhere tightly to the inner wall of the lumen. The waveform of the wave loop is unrestricted, including Z-shaped waves, M-shaped waves, V-shaped waves, sine waves, etc. The wave loop includes multiple peaks (also known as proximal apexes), multiple troughs (also known as distal apexes), and wave rods connecting adjacent peaks and troughs. A wave is formed by a vertex (near or far) and two wave rods connected to that vertex.

[0047] In this invention, "wave number" refers to the number of wave crests or troughs, and the number of wave crests and troughs is the same within the same wave cycle. "Wave height" in this invention refers to the vertical distance between a wave crest and the line connecting two adjacent wave troughs.

[0048] Regarding the shortest axial distance between adjacent waveform units as referred to in this invention, we will take two axially adjacent waveform units, waveform unit A and waveform unit B, as an example for explanation. Waveform unit A is located near the end of waveform unit B. The shortest axial distance that waveform unit A needs to move to abut against waveform unit B is the shortest axial distance.

[0049] Example 1

[0050] like Figures 1-3 As shown, the lumen stent 100 in this embodiment includes a main stent 1 and a branch stent 2.

[0051] The main support 1 is a tubular structure with openings at both ends, including a main wave coil 11 and a main membrane 12. Multiple main wave coils 11 are arranged axially and connected by the tubular main membrane 12.

[0052] The main support 1 includes at least one attachment segment 13, which is tubular, and the branch support 2 is disposed within the lumen of the attachment segment 13. In this embodiment, within the attachment segment 13, the main corrugated coil 11 is disposed on the outer side of the main covering membrane 12 to enhance the friction between the attachment segment 13 and the inner wall of the lumen, which helps to prevent the main support 1 from shifting or shortening relative to the lumen. In other embodiments, the main corrugated coil 11 may be disposed on the inner side of the main covering membrane 12, or the main covering membrane 12 may be disposed on both the inner and outer sides of the main corrugated coil 11.

[0053] In this embodiment, in order to better fit the inner wall of the lumen, the cross-sectional shape of the attachment segment 13 is generally circular. In other embodiments, the cross-sectional shape of the attachment segment 13 can be elliptical or any other suitable shape.

[0054] Reference Figure 4 In this embodiment, the attachment segment 13 includes a first region 14 and a second region 16 connected to the first region 14 in the circumferential direction. The first region 14 includes a plurality of axially arranged first waveform units 15. The second region 16 includes a plurality of axially arranged second waveform units 17. Both the first waveform units 15 and the second waveform units 17 are part of the main waveform loop 11. In this embodiment, the first region 14 includes two axially arranged first waveform units 15, namely a proximal first waveform unit 15a closer to the proximal end and a distal first waveform unit 15b closer to the distal end. The second region 16 also includes two second waveform units 17, namely a proximal second waveform unit 17a closer to the proximal end and a distal second waveform unit 17b closer to the distal end.

[0055] The first waveform unit 15 includes multiple high waves with roughly the same height. The second waveform unit 17 includes multiple low waves with roughly the same height. The ratio of the wave height of the first waveform unit 15 to the wave height of the second waveform unit 17 is 1.2 to 1.8.

[0056] The proximal first waveform unit 15a includes a first proximal trough 151 and a first proximal peak 153, and the distal first waveform unit 15b includes a first distal trough 152 and a first distal peak 154. The proximal second waveform unit 17a includes a second proximal trough 171 and a second proximal peak 173, and the distal second waveform unit 17b includes a second distal trough 172 and a second distal peak 174.

[0057] The first waveform unit 15a at the proximal end and the first waveform unit 15b at the distal end are out of phase, that is, the first proximal valley 151 and the first distal peak 154 are opposite (close to each other), and the first proximal peak 153 and the first distal valley 152 are separated (far from each other). At least one line connecting the first proximal valley 151 and the first distal peak 154 is approximately parallel to the axis of the main support 1.

[0058] The proximal second waveform unit 17a and the distal second waveform unit 17b are out of phase, that is, the second proximal trough 171 is opposite to the second distal peak 174, and the second proximal peak 173 is separate from the second distal trough 172. At least one line connecting the second proximal trough 171 and the second distal peak 174 is approximately parallel to the axis of the main support 1. Alternatively, the proximal second waveform unit 17a and the distal second waveform unit 17b have a phase difference, that is, the second proximal trough 171 is opposite to the second distal peak 174, and the line connecting any second proximal trough 171 and the second distal peak 174 forms an angle with the axis of the main support 1.

[0059] Reference Figure 4 In this embodiment, the first proximal valley 151 and the second proximal valley 171 are approximately located in the same radial plane, and the first distal valley 152 and the second distal valley 172 are also approximately located in the same radial plane.

[0060] Reference Figure 5 In other embodiments, the first proximal peak 153 and the second proximal peak 173 are approximately located in the same radial plane, and the first distal trough 152 and the second distal trough 172 are also approximately located in the same radial plane. This arrangement helps to increase the axial distance between adjacent second waveform units 17, making the second region 16 more flexible. When the second region 16 is implanted onto the lesser curve of the aortic arch (i.e., the side with a greater degree of curvature and a smaller radius of curvature), it can better conform to the curvature of the lesser curve, thereby increasing the friction between the main stent 1 and the inner wall of the lumen and further preventing shortening; in addition, Figure 5 Both the proximal first waveform unit 15 and the distal first waveform unit 15b can be manufactured using the same mold (or tooling), and the proximal second waveform unit 17a and the distal second waveform unit 17b can also be manufactured using the same mold (or tooling), thus making the manufacturing process simpler and more efficient.

[0061] In this embodiment, the shortest axial distance (also known as axial spacing) between two adjacent first waveform units 15 is less than the shortest axial distance between two adjacent second waveform units 17. For example, the shortest axial distance between adjacent first waveform units 15 is 0 to 2 mm. In other embodiments, the first region 14 includes two or more first waveform units 15, and the second region 16 includes two or more second waveform units 17, then the shortest axial distance between any two adjacent first waveform units 15 is less than the shortest axial distance between any two adjacent second waveform units 17.

[0062] Because the shortest axial distance between two adjacent first waveform units 15 in the first region 14 is less than the shortest axial distance between adjacent second waveform units 17, and the wave height of the first waveform unit 15 is greater than the wave height of the second waveform unit 17, when shortened by external force, the first region 14 can shorten axially by less than the second region 16. Furthermore, in this embodiment, the axial lengths of the first region 14 and the second region 16 are the same, therefore, the axial shortening rate of the first region 14 is less than that of the second region 16. The axial shortening rate refers to the ratio of the axial shortening length to the axial length in the naturally unfolded state when subjected to an axial pressure F (e.g., 1N ≤ F ≤ 2N) until it can no longer shorten. The axial shortening rate of the first region 14 and the second region 16 can be measured by the following method: In the naturally unfolded state, the length of the region to be tested (the first region 14 or the second region 16) is a, and the diameter is d. The attachment segment 13 is fitted into an inner tube with a diameter of 0.9d (e.g., a relatively smooth inner tube). Axial pressure (e.g., 1N to 2N) is applied uniformly to both ends of the region to be tested. Once there is a position in the region to be tested where it can no longer be shortened, the axial pressure is stopped, and the axial length of the region to be tested is measured as b. The axial shortening rate of the region to be tested is (ab) ÷ a × 100%.

[0063] It should be noted that the shortest axial distance between adjacent first waveform units 15 should be appropriate. An excessively long shortest axial distance makes the axial shortening ratio of the first region 14 too large, while an excessively short shortest axial distance makes it easy for the relative peaks and troughs on adjacent first waveform units 15 to stack together when the first waveform unit 15 extends to both ends due to radial compression. This increases the difficulty of assembling the lumen support 100 and increases the assembly force.

[0064] The surface of the attachment segment 13 is provided with a window 131, which is located on the main cover 12 at a position without a corrugation. For example, a recessed segment 18 can be formed on the surface of the main support 1, and the attachment segment 13 is provided with a slope 132 connected to the recessed segment 18. The slope 132 is formed by a part of the main cover 12, and the window 131 can be provided on the slope 132. The recessed segment 18 can provide a larger extension space for the bridging stent (not shown) at the connection between the bridging stent and the main support 1 during implantation, making it less likely for the bridging stent to become occluded during and after implantation.

[0065] The branch stent 2 is disposed within the lumen of the attachment section 13, and the inner cavity of the branch stent 2 is connected to the window 131 to ensure that the implanted bridging stent can be smoothly inserted into the branch stent 2 through the window 131. In other embodiments, the window of the main stent 1 may be omitted, the inner cavity of the branch stent 2 is connected to the inner cavity of the main stent 1, and the bridging stent can enter the main stent 1 from the distal end of the main stent 1 and be inserted into the branch stent 2.

[0066] Reference Figure 6 The branch support 2 includes branch wave coils 21 and branch cladding 22, with multiple branch wave coils 21 connected by the branch cladding 22. The branch support 2 includes two branch tubes 23 and a transition section 24. The distal end of the transition section 24 is connected to window 131 (see reference). Figure 1 The two branch tubes 23 are sealed together, with their distal ends connected to the proximal end of the transition section 24. The proximal end of the branch tube 23 is a free end and faces the proximal end of the main stent 1. The branch tube 23 and the transition section 24 can be an integral structure, formed by multiple branch coils 21 spaced apart and covered with a membrane on their inner and / or outer sides. In its naturally extended state, the axis of the branch tube 23 is approximately parallel to the axis of the main stent 1, which reduces the difficulty of bridging stent implantation and does not significantly affect blood flow within the lumen of the main stent 1. In other embodiments, the angle between the axial direction of the branch tube 23 and the axial direction of the main stent 1 can be any other angle within the range of 0° to 15°. Furthermore, the number of branch tubes 23 is not limited; there can be one or more, depending on the number and location of the bridging stents to be inserted. Therefore, it can meet the needs of emergency surgery in clinical use, avoiding the need for long waiting times due to custom-made stents and missing the optimal treatment opportunity. In addition, the branch cover 22 on the branch support 2 can also be formed by splicing multiple covers together through stitching, bonding and other methods.

[0067] Please refer to the following at the same time Figure 7The transition section 24 includes an arc-shaped sheet 241 and a relatively flat base 242. The arc-shaped sheet 241 and the base 242 together form a tubular structure with a roughly crescent-shaped cross-section. The arc-shaped sheet 241 is positioned closer to the inner wall of the attachment section 13 than the base 242, so that the transition section 24 fits better with the inner wall of the attachment section 13. Furthermore, the transition section 24 includes a small-diameter end and a large-diameter end. The small-diameter end is connected to the distal end of the branch pipe 23, and the large-diameter end is connected to the window 131. The radial dimension of the small-diameter end matches the radial dimension of the branch pipe 23, and the radial dimension of the large-diameter end matches the dimension of the window 131, thereby achieving a sealed connection between the small-diameter end and the branch pipe 23, and a sealed connection between the transition section 24 and the window 131. The transition section 24 can be connected to the window 131 and the branch pipe 23 by means of stitching, bonding, etc. An annular support member may also be provided at the edge of the large-diameter end of the transition section 24 or the edge of the window 131 to maintain the stability of the shape of the window 131.

[0068] The shape of the window 131 in this invention is not limited and can be circular, elliptical, crescent-shaped, or any other arbitrary shape. The radial dimension of the window 131 is larger than the radial dimension (e.g., diameter) of the branch tube 23, thereby facilitating the implantation of the bridging stent. In other embodiments, multiple windows 131 and multiple branch stents 2 can be provided on the surface of the main stent 1. The multiple windows 131 are spaced apart along the axial direction of the main stent 1, thereby allowing the specific fixing position of the main stent 1 to be adjusted according to the structure of the arterial blood vessels, thereby enabling the reconstruction of blood supply to multiple branch vessels. It is understood that in this embodiment, the branch tube 23 of the branch stent 2 is closer to the proximal end of the main stent 1 than the transition section 24. In other embodiments, the branch tube 23 of the branch stent 2 may also be closer to the distal end of the main stent 1 than the transition section 24. Alternatively, when multiple branch stents 2 are provided, in the case of multiple branch stents 2, the branch tube 23 of some branch stents 2 is closer to the proximal end of the main stent 1, while the main body of another portion of the branch stents 2 is closer to the distal end of the main stent 1.

[0069] Please refer to the following at the same time Figures 1-3 In this embodiment, the branch support 2 is connected to the first region 14, and the distance from the branch support 2 to the first region 14 is less than the distance from the branch support 2 to the second region 16. Since the branch support 2 is connected to the first region 14, which has a low axial shortening rate, even if the branch support 2 is hooked by the conveyor and causes the main support 1 to deform, the first region 14 connected to the branch support 2 can still greatly reduce the shortening rate of the main support 1.

[0070] In this embodiment, the branch stent 2 is fitted to the inner wall of the first region 14, and the tangent areas of the branch stent 2 and the first region 14 are sutured together and fixed. For example, there is a tangent line extending approximately axially between the branch tube 23 and the inner wall of the first region 14. The tangent points of the branch tube 23 and the inner wall of the first region 14 (i.e., along the tangent line) are sutured together and fixed, so that multiple fixing points are formed on the tangent line between the branch tube 23 and the inner wall of the first region 14. Fixing points are provided on both the proximal port (i.e., the proximal port 20a of the branch stent 2) and the distal port of the branch tube 23 to ensure that the shape of the branch stent 2 does not change significantly under the impact of blood flow or when it is hooked by the delivery device, effectively preventing the branch stent 2 from shortening. Furthermore, the side of the transition segment 24 that fits against the first region 14 (i.e., the arc-shaped sheet 241) can be connected to the first region 14 via sutures to ensure better fit between the transition segment 24 and the inner wall of the first region 14, and to minimize the gap between the transition segment 24 and the first region 14, preventing blood from accumulating in the gap and causing thrombosis. In other embodiments, the transition segment 24 is connected to the window 131 at one end and to the branch tube 23 at the other end; other areas may not be fixed to the first region 14. Additionally, in other embodiments, the branch support 2 can be fixed to the first region 14 by bonding or other methods.

[0071] Please refer to the following at the same time Figure 1 , Figure 4 The length and position of the branch tube 23 affect performance. In this embodiment, the ratio of the length of the branch tube 23 to the wave height of the first waveform unit 15 can be 0.5 to 2.2. The proximal port of the branch tube 23 and the wave crest of the proximal first waveform unit 15a are approximately located on the same radial plane, or the proximal port of the branch tube 23 is located between the first proximal wave crest 153 and the first distal wave trough 152. The purpose of this arrangement is to position the branch tube 23 in the first region 14 where it is supported by the first waveform unit 15, thereby making it more difficult for the branch support 2 to shorten the main support 1.

[0072] Reference Figure 3 In this embodiment, the main waveguide 11 at the nearest end of the main support 1 is a bare waveguide 11a. Multiple troughs of this bare waveguide 11a are fixedly connected to the inner side of the proximal edge of the main covering membrane 12, and part of the bare waveguide 11a is exposed, meaning the main covering membrane 12 only partially covers the bare waveguide 11a. The bare waveguide 11a improves the anchoring force between the main support 1 and the lumen, and also enhances the proximal wall adhesion of the main support 1, fully opening the proximal port of the main support 1 and effectively reducing the risk of internal leakage. In other embodiments, the bare waveguide 11a may be completely exposed or omitted.

[0073] Example 2

[0074] Reference Figure 8 , Figure 9 This embodiment is largely the same as the lumen support 100 in Embodiment 1, except for the structure of the first waveform unit 35 and the second waveform unit 37 in the attachment segment 13, and the connection method between the branch support 2 and the first region 14.

[0075] like Figure 9 As shown, both the first waveform unit 35 and the second waveform unit 37 are part of the main waveform loop 11. In this embodiment, the first region 14 includes two axially arranged first waveform units 35, namely a proximal first waveform unit 35a closer to the proximal end and a distal first waveform unit 35b closer to the distal end. The second region 16 also includes two second waveform units 37, namely a proximal second waveform unit 37a closer to the proximal end and a distal second waveform unit 37b closer to the distal end.

[0076] The proximal first waveform unit 35a and the distal first waveform unit 35b are out of phase. The proximal second waveform unit 37a and the distal second waveform unit 37b are out of phase; or, there is a phase difference between the proximal second waveform unit 37a and the distal second waveform unit 37b. The wave height of the first waveform unit 35a is greater than the wave height of the second waveform unit 37b. The proximal first waveform unit 35a includes multiple first proximal peaks 353 and multiple first proximal valleys 351, which are generally located in the same radial plane. Similarly, the distal first waveform unit 35b includes multiple first distal peaks 354 and multiple first distal valleys 352, which are generally located in the same radial plane. The proximal second waveform unit 37a includes multiple second proximal peaks 373, which are generally located in the same radial plane, and multiple second proximal valleys 371, which are located in different radial planes. The distal second waveform unit 37b includes a plurality of second distal troughs 372 generally located in the same radial plane, and a plurality of second distal peaks 374 located in different radial planes. The second proximal troughs 371 that are closer to the first region 14 circumferentially are closer to the proximal end of the main support 1 axially, and / or, the second distal peaks 374 that are closer to the first region 14 circumferentially are closer to the distal end of the main support 1 axially. For example, in this embodiment, in the proximal second waveform unit 37a, the second proximal peaks 373 are all closer to the distal end than the first proximal peaks 353, the second proximal troughs 371 are all closer to the proximal end than the first proximal troughs 351, and the second proximal troughs 371 that are farther from the proximal first waveform unit 35a are offset more proximally relative to the first proximal troughs 351. Figure 9As shown, the line connecting the second proximal troughs 371 forms an angle α with the radial plane, where 0 < α ≤ 20°. In other embodiments, the line connecting the second proximal troughs 371 may not be straight; for example, it may be stepped. In the distal second waveform unit 37b, the second distal troughs 372 are all closer to the proximal end than the first distal troughs 352, and the second distal peaks 374 are all closer to the distal end than the first proximal peaks 353. Furthermore, the distance a second distal peak 374 is further from the distal first waveform unit 35b is greater relative to the first distal peak 354. For example, the line connecting the second distal peaks 374 forms an angle β with the radial plane, where 0 < β ≤ 20°. In other embodiments, the line connecting the second distal peaks 374 may not be straight; for example, it may be stepped. Since the second proximal trough 371 is distributed on different radial planes and the second distal peak 374 is distributed on different radial planes, when the second waveform unit 37 is radially compressed, the second proximal trough 371 and the second distal peak 374 will not accumulate on the same radial plane. This reduces the radial compression size and assembly difficulty of the luminal stent 100 while ensuring the same radial force. In addition, when the second waveform unit 37 is implanted into the lesser curve of the aortic arch, it can better fit the curvature of the lesser curve, thereby increasing the friction between the main stent 1 and the inner wall of the lumen and further preventing shortening.

[0077] In this embodiment, the shortest axial distance (also known as axial spacing) between two adjacent first waveform units 35 is less than the shortest axial distance between two adjacent second waveform units 37. For example, the shortest axial distance between adjacent first waveform units 35 is 0-2 mm. In other embodiments, the first region 14 includes two or more first waveform units 35, and the second region 16 includes two or more second waveform units 37, then the shortest axial distance between any two adjacent first waveform units 35 is less than the shortest axial distance between any two adjacent second waveform units 37.

[0078] Because the shortest axial distance between two adjacent first waveform units 35 in the first region 14 is less than the shortest axial distance between adjacent second waveform units 37, and the wave height of the first waveform unit 35 is greater than the wave height of the second waveform unit 37, when shortened by external force, the amount of axial shortening of the first region 14 is less than that of the second region 16. Therefore, the axial shortening rate of the first region 14 is less than that of the second region 16. Even if the main support 1 is driven by the branch support 2, the first region 14 can still greatly reduce the shortening degree of the main support 1.

[0079] Reference Figure 8In this embodiment, the branch tube 23 can also be connected to the first region 14 by suturing. For example, there is a generally axially extending tangent between the branch tube 23 and the inner wall of the first region 14. The suture can be run from the distal end of the branch tube 23 along the tangent towards the proximal end (or from the proximal end to the distal end), and the suture ends near the proximal end of the branch tube 23. This results in the branch tube 23 having a fixed segment that is sutured and fixed to the first region 14 and located at the distal end, and a movable segment that can move relative to the main support 1 and located at the proximal end (at least including the proximal port 20a of the branch support 2). The ratio of the length of the movable segment to the length of the fixed end is 0.1 to 1, to ensure that the movable segment can move relatively flexibly relative to the main support 1, and to avoid the instability of the branch tube 23 under the impact of blood flow. For the transition segment 24, the side of the transition segment 24 that fits against the first region 14 (i.e., the arc-shaped sheet 241) can be connected to the first region 14 by sutures, so that the transition segment 24 fits better against the inner wall of the first region 14, and the gap between the transition segment 24 and the first region 14 can be minimized to prevent blood from pooling in the gap and causing thrombosis. In other embodiments, the transition segment 24 has only one end and window 131 (see reference). Figure 1 One end is connected to the first region 14, and the other end is connected to the branch pipe body 23. Other areas may not be fixed to the first region 14. In addition, in other embodiments, the fixed connection between the branch bracket 2 and the first region 14 can also be by bonding, etc.

[0080] In this embodiment, by setting a branch support 2 with a movable proximal port 20a, even when the proximal port 20a of the branch support 2 is hooked by the conveyor and pulled in the proximal direction during the process of the conveyor retracting from the proximal end to the distal end, the proximal port 20a can still move relative to the main support 1. Therefore, the force of the branch support 2 driving the main support 1 to move to the distal end can be weakened to a certain extent, thereby reducing the risk of the branch support 2 causing the main support 1 to shorten.

[0081] The location of the branch support 2 and the position of the fixing point between the branch support 2 and the first region 14 also affect the anti-shortening performance. In this embodiment, the proximal port 20a of the branch support 2 is approximately flush with the first proximal peak 353, or the proximal port 20a of the branch support 2 is located between the first proximal peak 353 and the first proximal trough 351; and the nearest fixing point between the branch support 2 and the first region 14 is located between the first proximal peak 353 and the first proximal trough 351. In this embodiment, even if the branch support 2 drives the main support 1 to move to the distal end, it will only drive the area near the proximal first waveform unit 35a to move to the distal end. Since the shortest axial distance between the proximal first waveform unit 35a and the distal first waveform unit 35b is small, the shortening degree of the main support 1 is greatly reduced.

[0082] Example 3

[0083] Reference Figure 10 , Figure 11 This embodiment is largely the same as the lumen support 100 in Embodiments 1 and 2, except for the structure of the first waveform unit 45, the second waveform unit 47 and the branch support 2, as well as the connection method between the branch support 2 and the first region 14.

[0084] Reference Figure 10 The first proximal peak 453 of the proximal first waveform unit 45a and the second distal peak 473 of the proximal second waveform unit 47a are approximately located in the same radial plane. The first proximal trough 451 of the proximal first waveform unit 45a and the second proximal trough 471 of the proximal second waveform unit 47a are approximately located in the same radial plane. The first distal peak 454 of the distal first waveform unit 45b and the second distal peak 474 of the distal second waveform unit 47b are approximately located in the same radial plane. The first distal trough 452 of the distal first waveform unit 45b and the second distal trough 472 of the distal second waveform unit 47b are approximately located in the same radial plane. That is, the wave height of the first waveform unit 45 is approximately equal to the wave height of the second waveform unit 47. In addition, the proximal first waveform unit 45a and the distal first waveform unit 45b are out of phase. The proximal second waveform unit 47a and the distal second waveform unit 47b are in phase, that is, the line connecting the second proximal trough 471 and the second distal trough 472 is approximately parallel to the axis of the main support 1, and the line connecting the second proximal peak 473 and the second distal peak 474 is approximately parallel to the axis of the main support 1. In other embodiments, a phase difference may exist between the proximal second waveform unit 47a and the distal second waveform unit 47b.

[0085] In this embodiment, the shortest axial distance (also known as axial spacing) between two adjacent first waveform units 45 is less than the shortest axial distance between two adjacent second waveform units 47. For example, the shortest axial distance between adjacent first waveform units 45 is 1 to 2 millimeters. In other embodiments, the first region 14 includes two or more first waveform units 45, and the second region 16 includes two or more second waveform units 47, then the shortest axial distance between any two adjacent first waveform units 45 is less than the shortest axial distance between any two adjacent second waveform units 47.

[0086] Since the shortest axial distance between two adjacent first waveform units 45 in the first region 14 is less than the shortest axial distance between adjacent second waveform units 47, and the wave height of the first waveform unit 45 is approximately equal to the wave height of the second waveform unit 47, when shortened by external force, the amount of axial shortening of the first region 14 is less than that of the second region 16. Therefore, the axial shortening rate of the first region 14 is less than that of the second region 16. Even if the main support 1 is driven by the branch support 2, the first region 14 can greatly reduce the shortening degree of the main support 1. In addition, in this embodiment, the wave height of the first waveform unit 45 is approximately equal to the wave height of the second waveform unit 47. Compared with the high and low wave design, the hollow membrane region of the attachment segment 13 in this embodiment (i.e., the region where the main body film 12 is not covered on the waveform unit) is more uniform and round in the circumferential direction, and is less likely to cause a large accumulation of film on one side when bent.

[0087] Reference Figure 11 In this embodiment, the branch tube 23 of the branch support 2 is further provided with a straight or curved support wire 25. The support wire 25 can be a rigid or flexible structure, and can be made of an alloy of two or more single metals selected from cobalt, chromium, nickel, titanium, magnesium, and iron, as well as 316L stainless steel, nickel-titanium-tantalum alloy, or other biocompatible elastic metallic materials. The support wire 25 connects the nearest branch coil 21 and the farthest branch coil 21, which can prevent the branch support 2 from shortening to a certain extent. In other embodiments, the support wire 25 can also extend to the transition section 24 of the branch support 2.

[0088] Reference Figure 12 In other embodiments, the support wire 25 is disposed on the outer surface of the branch support 2, and the branch support 2 is connected to the main support 1 through the support wire 25. Since the support wire 25 is connected to the main support 1, it can also prevent the shortening of the main support 1 to a certain extent. The proximal end of the support wire 25 can extend beyond the proximal port of the branch support 2 to improve the anti-shortage performance. Furthermore, the proximal end of the support wire 25 can extend further proximal and abut against the bare wave coil 11a, which can more effectively prevent the shortening of the branch support 2 and the main support 1. In other embodiments, the proximal end of the support wire 25 can also be located between the proximal port of the branch support 2 and the bare wave coil 11a, without abutting against the bare wave coil 11a.

[0089] Example 4

[0090] Reference Figure 13 This embodiment is largely the same as the lumen support 100 in embodiments 1-3, except that one or more first elastic elements 56 are provided between adjacent first waveform units 55. The first elastic element 56 can be integrally woven or cut with the first waveform unit 55, or it can be connected to the first waveform unit 55 by means of bonding, welding or other methods.

[0091] Figure 13 The first waveform unit 55 and the second waveform unit 57 shown are largely the same as in Embodiment 1. The first elastic member 56 includes a spring segment, one end of which is connected to the trough of the proximal first waveform unit 55a, and the other end is connected to the peak of the distal first waveform unit 55b, with the peak and trough being opposite to each other.

[0092] Figure 14 The first waveform unit 55 and the second waveform unit 57 shown are substantially the same as those in Embodiment 1, except that adjacent first waveform units 55 have the same phase. The first elastic element 56 is a metal wire made of a biocompatible metallic elastic material, which includes at least one wave, and the waveform includes Z-shape, M-shape, V-shape, sine wave, etc. One end of the first elastic element 56 is connected to the wave rod of the proximal first waveform unit 55a, and the other end is connected to the wave rod of the distal first waveform unit 55b.

[0093] This embodiment incorporates a first elastic element 56, which possesses a certain degree of elasticity in the axial direction. Please also refer to... Figure 1 When the branch support 2 applies a force to the first region 14 to move distally, the elasticity of the first elastic element 56 can provide a certain degree of buffering, thus effectively preventing the main support 1 from shortening regardless of the structure of the first waveform unit 55. In addition, when the attachment section 13 is in a radially compressed state, the first elastic element 56 can prevent the opposing peaks and troughs on adjacent first waveform units 55 from stacking together.

[0094] Example 5

[0095] Reference Figure 15 This embodiment is largely the same as the lumen stent 100 in embodiments 1-4, except that a second elastic element 19 is provided between the main stent 1 and the branch stent 2 to connect them. The second elastic element 19 allows at least a portion of the branch stent 2 (e.g., the proximal port 20a of the branch stent 2) to move relative to the main stent 1 under external force, deforming within a certain range. After the external force is removed, it can approximately return to its initial position. During the retraction of the conveyor from the proximal end to the distal end, even when the proximal port 20a of the branch stent 2 is hooked by the conveyor and pulled proximally, it can still move relative to the main stent 1. Therefore, it can weaken the force that causes the branch stent 2 to move the main stent 1 distally, thereby reducing the risk of the branch stent 2 causing the main stent 1 to shorten. When the force of the conveyor hooking is removed, the proximal port 20a of the branch stent 2 returns to its initial position.

[0096] Please refer to the following at the same time Figure 16In this embodiment, the second elastic member 19 is elastic and includes an elastic segment 192 and connecting segments (hereinafter referred to as the first connecting segment 191 and the second connecting segment 193) located at both ends of the elastic segment 192. The first connecting segment 191 is connected to the main support 1, and the second connecting segment 193 is connected to the branch support 2. On the same longitudinal section, the angle between the length extension direction of the second elastic member 19 and the outer surface of the branch support 2 ranges from 0 to 90°, that is, the angle between the force direction of the second elastic member 19 and the outer surface of the branch support 2 ranges from 0 to 90°.

[0097] In this embodiment, when both the main support 1 and the branch support 2 are in their naturally extended state, the elastic segment 192 of the second elastic element 19 is in a stretched state. This provides a certain tension to the branch support 2, ensuring it adheres tightly to the inner wall of the main support 1. Simultaneously, it provides the branch support 2 with a certain amount of space to move relative to the main support 1, preventing it from shifting under the impact of blood flow and thus affecting normal blood flow. It is understood that in other embodiments, when both the main support 1 and the branch support 2 are in their naturally extended state, the second elastic element 19 may also be in a naturally relaxed state.

[0098] In this embodiment, the first connecting segment 191 and the second connecting segment 193 of the second elastic element 19 can be connected to the corrugated coil or the membrane of the main support 1 and the branch support 2, respectively. For example, connecting the second elastic element 19 to the corrugated coil can prevent the membrane from being damaged under the tension of the second elastic element 19, thus avoiding the occurrence of internal leakage.

[0099] It is understood that in other embodiments, the second elastic member 19 may also be provided with only one connecting segment, in which case the other end of the elastic segment 192 is directly connected to the branch bracket 2 or the main bracket 1.

[0100] Specifically, the second elastic element 19 can be made of a single or multiple strands of nickel-titanium wire or stainless steel wire in a spatial spiral. In order to ensure that the second elastic element 19 can fully extend when subjected to a suitable tensile force, and can return to its original state and maintain a certain stability after the force is released, the stiffness coefficient K of the elastic segment 192 of the second elastic element 19 is in the range of 0 < K < 100 N / M.

[0101] The first connecting segment 191 of the second elastic member 19 can be positioned closer to the proximal end of the main stent 1 than the second connecting segment 193 (i.e., the angle between the force direction of the second elastic member 19 and the outer surface of the branch stent 2 is greater than 0 degrees). This allows the branch stent 2 to always be positioned towards the proximal end of the lumen stent 100 under the tension of the second elastic member 19, thereby making the branch stent 2 sufficiently close to the inner surface of the main stent 1. This reduces or eliminates the gap between the main stent 1 and the branch stent 2, thereby minimizing the impact of the branch stent 2 on blood flow within the main stent 1 and reducing thrombus formation.

[0102] like Figure 15 , 16 As shown, the second elastic element 19 is disposed between the outer surface of the branch stent 2 away from the central axis of the main stent 1 and the main stent 1, thereby facilitating the connection between the branch stent 2 and the main stent 1, allowing the branch stent 2 to fit snugly against the inner surface of the main stent 1 and reducing the deformation of the branch stent 2. Simultaneously, it avoids affecting blood flow within the lumen of the main stent 1 due to the large spatial distribution range of the second elastic element 19 within the lumen of the main stent 1. Correspondingly, the first connecting segment 191 connected to the inner surface of the main stent 1 can be distributed in the circumferential region corresponding to the horizontal plane tangent to the lower edge of the proximal end face of the branch stent 2. Figure 17 The dashed line in the middle represents the horizontal plane that is tangent to the lower edge of the near end face of branch bracket 2.

[0103] In this embodiment, there are two second elastic elements 19, and both second elastic elements 19 are disposed on the same side of the branch support 2 along the axial direction. In other examples of this embodiment, one or more second elastic elements 19 may be provided. For example, multiple second elastic elements 19 may be disposed axially on the same side of the branch support 2, and the multiple second elastic elements 19 may be arranged axially or staggered. From the proximal end to the distal end of the branch tube 23, the deformable length of the multiple second elastic elements 19 may gradually decrease, thereby allowing the proximal region of the branch tube 23 to move a larger range relative to the main support 1. In other embodiments, one or more second elastic elements 19 may also be provided on the transition section 24.

[0104] Please refer to Figure 18 In other embodiments, second elastic elements 19 are provided on both sides of the branch bracket 2. The main bracket 1 and the branch bracket 2 are connected by the second elastic elements 19 on both sides, so that the force on the branch bracket 2 is more balanced and the stability of the branch bracket 2 is further improved.

[0105] Reference Figure 19In other embodiments, the second elastic member 19 includes an intermediate section 194 and elastic sections 192 disposed at both ends of the intermediate section 194. The intermediate section 194 is arc-shaped and connected to the branch bracket 2. Specifically, the intermediate section 194 is connected to the outer surface of the branch bracket 2 facing the central axis of the main bracket 1. The intermediate section 194 may conform to the shape of a portion of the outer surface of the branch bracket 2, thereby making the intermediate section 194 completely fit with the outer surface of the branch bracket 2 facing the central axis of the main bracket 1, or it may be of other shapes, only partially fitting with the outer surface of the branch bracket 2 facing the central axis of the main bracket 1. The elastic segments 192 at both ends of the intermediate section 194 are respectively located on both sides of the branch bracket 2. The elastic segments 192 on both sides are connected to the main bracket 1 through the first connecting section 191, thereby forming a U-shaped structure for the second elastic element 19. This increases the contact area between the second elastic element 19 and the branch bracket 2, making the tensile force provided by the second elastic element 19 to the branch bracket 2 more evenly distributed, reducing damage to the coating of the branch bracket 2, and further improving the deformation resistance and deformation recovery ability of the branch bracket 2. The elastic segments 192 can be pressed, welded, or integrally formed with the intermediate section 194 through the second connecting section 193.

[0106] In other embodiments, the intermediate segment 194 is part of the structure of the branch support 2, that is, the intermediate segment 194 is a plurality of branch wave coils 21 constituting the branch support 2 (see reference). Figure 6 One of the following is a broken wave loop, with an elastic segment 192 provided at each end of the break. In other embodiments, the intermediate segment 194 may also be connected to the main support 1, or the intermediate segment 194 may be part of the main support 1, and the composition structure is consistent with the relationship between the intermediate segment 194 and the branch support 2, which will not be described in detail here.

[0107] Example 6

[0108] Reference Figure 20 This embodiment is largely the same as the lumen support 100 in embodiments 1-5, except for the structure and position of the second elastic element 29.

[0109] In this embodiment, the second elastic member 29 is fitted onto the inner surface and / or outer surface of the branch support 2, and one end of the second elastic member 29 is closer to the proximal end of the branch support 2 than the other end. The second elastic member 29 is used to provide elastic force to the branch support 2 to restore deformation.

[0110] The second elastic element 29 in this embodiment includes a support rod, preferably made of a superelastic nickel-titanium alloy with a diameter of 0.05mm to 0.3mm. In this embodiment, the second elastic element 29 and the branch support 2 are separate structures. Specifically, the proximal end of the second elastic element 29 is connected to the proximal end of the branch support 2, and the distal end of the second elastic element 29 is connected to the distal end of the branch support 2, thereby providing axial support force to the branch support 2, improving the branch support 2's ability to recover deformation in the axial direction, and allowing at least a portion of the branch support 2 (including the proximal port 20a) to move relative to the main support 1 under external force, deforming within a certain range, and roughly returning to its initial position after the external force is removed. The specific shape of the support rod is not required; it can be one or a combination of straight, wavy, or curved shapes.

[0111] When window 131 (reference) Figure 1 When a ring-shaped support is provided at the position, the far end of the second elastic element 29 is connected to the support. When the branch support 2 is subjected to the force of the conveyor, the shape of the branch support 2 is more stable because the second elastic element 29 is connected to the main support 1. The branch support 2 can recover to its original state more quickly after deformation.

[0112] In other embodiments, the second elastic element 29 may also be a part of the branch support 2. Specifically, the second elastic element 29 and the branch tube body 23 are an integral structure. The proximal end of the second elastic element 29 is located at the proximal end of the branch tube body 23, and the distal end of the second elastic element 29 extends to the distal end of the transition section 24. It is connected to the transition section 24 by means of stitching, pressing, bonding, etc., so that the second elastic element 29 is arranged along the axial direction of the branch support 2 to provide the branch support 2 with support force and elastic force to recover deformation.

[0113] In other embodiments, the second elastic element 29 may be disposed only in the proximal region of the branch tube 23. For example, one end of the second elastic element 29 may be disposed at the proximal end of the branch tube 23, and the other end may be disposed between the proximal end and the distal end of the branch tube 23. The region of the branch tube 23 without the second elastic element 29 may be fixedly connected to the first region 14 by means of stitching, bonding, or other methods. The ratio of the axial length of the region of the branch tube 23 with the second elastic element 29 to the total length of the branch tube 23 is 0.2 to 0.5, which is beneficial for reducing the radial compression dimension of the lumen support 100.

[0114] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A lumen stent, characterized in that, include: The main support and branch support are provided. The main support includes a tubular attachment section. The attachment section includes a first region and a second region connected to the first region in the circumferential direction. The branch support is disposed in the cavity of the attachment section and is fixedly connected to the first region and fits against the inner wall of the first region. The distance from the branch support to the first region is less than the distance from the branch support to the second region. The axial shortening ratio of the first region is less than the axial shortening ratio of the second region.

2. The lumen stent according to claim 1, characterized in that, The first region includes a plurality of first waveform units arranged axially, and the second region includes a plurality of second waveform units arranged axially. The shortest axial distance between two adjacent first waveform units is less than the shortest axial distance between two adjacent second waveform units.

3. The lumen stent according to claim 2, characterized in that, The wave height of the first waveform unit is greater than the wave height of the second waveform unit.

4. The lumen stent according to claim 2, characterized in that, The first region includes adjacent proximal first waveform units and distal first waveform units. The proximal first waveform unit includes a first proximal trough, and the distal first waveform unit includes a first distal peak. At least one first proximal trough is opposite to one first distal peak, and the line connecting the first distal peak and the first proximal trough is approximately parallel to the axis of the main support.

5. The lumen stent according to claim 2, characterized in that, The second region includes a proximal second waveform unit and a distal second waveform unit. The proximal second waveform unit includes multiple proximal wave troughs located in different radial planes, and the distal second waveform unit includes multiple distal wave peaks located in different radial planes. The proximal wave troughs that are closer to the first region in the circumferential direction are closer to the proximal end of the main support, and / or the distal wave peaks that are closer to the first region in the circumferential direction are closer to the distal end of the main support.

6. The lumen stent according to claim 2, characterized in that, The wave height of the first waveform unit is approximately equal to the wave height of the second waveform unit, and the phases of adjacent first waveform units are opposite, while the phases of adjacent second waveform units are the same or there is a phase difference.

7. The lumen stent according to any one of claims 1 to 6, characterized in that, The first region includes a plurality of first waveform units arranged axially, and at least one first elastic element is provided between adjacent first waveform units.

8. The lumen stent according to any one of claims 1 to 6, characterized in that, The branch support has a proximal port that is movable relative to the main support.

9. The lumen stent according to claim 8, characterized in that, The lumen stent further includes a second elastic element, which is disposed between the inner surface of the main stent and the inner surface of the branch stent. The second elastic element is elastic and is used to limit the range of motion of the proximal port of the branch stent.

10. The lumen stent according to claim 1, characterized in that, At least one of the branch supports is provided with a straight or curved support wire, one end of which is closer to the proximal end of the branch support than the other end.

11. The lumen stent according to claim 10, characterized in that, The support wire is located on the outer or inner surface of the branch support.

12. The lumen stent according to claim 11, characterized in that, The proximal end of the support wire extends beyond the proximal port of the branch support.

13. The lumen stent according to claim 12, characterized in that, The main support includes a main membrane and at least one main wave coil disposed within the main membrane. When the lumen support is in a naturally extended state, the proximal end of the support wire abuts against the main wave coil.

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