Lumen stent

Abstract

The present application relates to a kind of luminal stents, the luminal stent includes tubular body and extension section, the extension section is woven by braided wire, the distal end of the extension section is connected with the proximal end of the tubular body, the extension section gradually away from the central axis of the tubular body from its distal end to proximal end to make the extension section be inclined outward relative to the tubular body, the luminal stent also includes limiting structure, the limiting structure is used to define the inclination of the extension section relative to the tubular body in axial direction.The luminal stent provided by the present application can prevent the proximal end of the extension section from being folded outward relative to the tubular body due to the extrusion force along the radial direction inward at the connection between the extension section and the tubular body during the positioning stage of the luminal stent, which affects the positioning of the luminal stent, and even can cause the injury of blood vessel wall or poor stent deployment.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a lumen stent. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Iliac Venous Compression Syndrome (IVCS), also known as May-Thurner syndrome or Cockett syndrome, is more common on the left side, but can also occur on the right side, or even bilaterally. In a narrow sense, IVCS refers to the compression of the left common iliac vein by the right common iliac artery anteriorly and the fifth lumbar vertebra and lumbosacral joint posteriorly before it joins the inferior vena cava. This prolonged compression of the venous wall and the formation of intravascular adhesions lead to impaired venous return in the lower extremities and pelvis. However, physiological and anatomical factors are not the only cause of IVCS. Other factors such as pelvic masses, pregnancy in women, pelvic hematoma after trauma, and pelvic surgery can also cause compression of the left common iliac vein. Therefore, in a broader sense, IVCS should be a syndrome resulting from compression of the left common iliac vein due to various causes. If factors that slow blood flow and increase blood viscosity are present, deep vein thrombosis is highly likely. In principle, for IVCS with acute deep vein thrombosis, the thrombus should be removed as early as possible, and the primary lesion should be treated simultaneously. This is the only way to rapidly improve symptoms, increase and maintain blood flow velocity in both the inflow and outflow tracts, maximize the protection of venous valve function, and reduce the incidence of postthrombotic syndrome (PTS) in the long term. However, traditional simple thrombolysis is less effective because many collateral circulations have formed around the lesion segment of the iliac vein, preventing thrombolytic drugs from fully contacting the thrombus. Procedures such as iliac vein incision and reconstruction, right common iliac artery transposition, venous bypass, and iliac vein wrapping are highly invasive, have many complications, and their effects are not ideal.

[0004] In recent years, percutaneous thrombectomy (PTC), combined with balloon dilation and stent implantation, has become more in line with normal human physiology and anatomy than traditional treatments. It not only boasts high vascular patency rates, fewer complications, and significant clinical efficacy, but also greatly shortens hospital stays. Currently, PTC combined with balloon dilation and stent implantation has become the preferred treatment method for intravascular coagulation (IVCS). Regarding stent implantation, the main stent designs include laser-cut stents and braided stents. Laser-cut stents are the primary fabrication technology for iliac vein stents both domestically and internationally. Laser-cut stents offer good positioning performance but suffer from poor flexibility and fracture resistance. Braided stents, on the other hand, offer good flexibility and fracture resistance, but also have disadvantages such as inaccurate positioning, tendency to shorten, and weak support.

[0005] Because the proximal end of an iliac vein stent is deployed at the iliac confluence, to adapt to the shape of the iliac confluence, the proximal end of the stent can be tilted outwards to form a funnel-shaped extension. The extension is woven from braided wire to give it a certain degree of flexibility, which is conducive to the proximal end of the stent adhering to the wall. However, for iliac vein stents woven from braided wire, during the deployment process of the luminal stent, especially in the positioning phase, the proximal extension is hooked to the tubular body. When the sheath is positioned at the connection between the extension and the tubular body, the distal end of the sheath exerts radial inward pressure on the connection, which can easily cause the proximal end of the extension to fold outwards relative to the tubular body, affecting the positioning of the luminal stent, or even causing puncture of the vessel wall or poor stent deployment. Summary of the Invention

[0006] One technical problem addressed by this invention is how to provide a luminal stent to solve the aforementioned problems of affecting the positioning of the luminal stent and potentially causing puncture of the blood vessel wall or poor stent deployment.

[0007] The present invention provides a lumen stent comprising a tubular body and an extension segment, the extension segment being woven from braided filaments, the distal end of the extension segment being connected to the proximal end of the tubular body, the extension segment gradually moving away from the central axis of the tubular body from its distal end to its proximal end such that the extension segment is inclined outward relative to the tubular body, the lumen stent further comprising a limiting structure for limiting the axial inclination of the extension segment relative to the tubular body.

[0008] In one embodiment, the extension section includes a transition section and a flared main section, the transition section and the flared main section being arranged sequentially along the axial direction, and the flared main section being located on the proximal side of the extension section. The flared main section includes a first single wave and a plurality of wave rods overlapping and intersecting with the first single wave. At least one wave rod overlapping and intersecting with the first single wave and at least one other wave rod overlapping and intersecting with the first single wave are located on the inner and outer sides of the first single wave.

[0009] In one embodiment, the first single wave includes a first trough, a first crest, a second trough, a first wave rod, and a second wave rod. The first trough and the second trough are located on opposite sides of the first crest in the circumferential direction. The first crest and the first trough are connected by the first wave rod, and the first crest and the second trough are connected by the second wave rod. The first trough and the second trough are hooked to two crests of the transition section, and at least one crest near the end of the transition section spans between the first trough and the second trough.

[0010] In one embodiment, the transition section spans two wave crests between the first and second wave troughs. The flared main section further includes a second single wave and a third single wave. The second single wave includes a third wave trough, a second wave crest, a third wave crest, a third wave rod, and a fourth wave rod. The third wave trough is located between and close to the first wave trough. The second wave crest and the third wave crest are located on opposite sides of the third wave trough. The third wave trough and the second wave crest are connected by the third wave rod, and the third wave trough and the third wave crest are connected by the third wave rod. The four-wave rod connection; the third single wave includes a fourth wave trough, a fourth wave peak, a fifth wave peak, a fifth wave rod, and a sixth wave rod. The fourth wave trough is located between the third wave trough and the second wave trough. The fourth wave peak and the fifth wave peak are located on both sides of the third wave trough. The third wave trough and the fourth wave peak are connected by the fifth wave rod. The third wave trough and the fifth wave peak are connected by the sixth wave rod. The third wave rod and the fifth wave rod overlap and intersect with the first wave rod, and the fourth wave rod and the sixth wave rod overlap and intersect with the second wave rod, respectively.

[0011] The third wave rod and the fifth wave rod are respectively located on the inner and outer sides of the first single wave, so that the wave rods of the first single wave, the second single wave and the third single wave form an interlocking limiting structure;

[0012] Alternatively, the third wave rod and the fifth wave rod are on the same side of the first single wave, and at least one of the fourth wave rod and the sixth wave rod is on the inner and outer sides of the first single wave, so that the wave rods of the first single wave, the second single wave and the third single wave form an interlocking limiting structure.

[0013] In one embodiment, the flared main section further includes a second single wave, which includes a third trough, a second peak, a third peak, a third rod, and a fourth rod. The third trough is located between the first trough and the second trough. The second peak and the third peak are located on opposite sides of the third trough. The third trough and the second peak are connected by the third rod, and the third trough and the third peak are connected by the fourth rod. The third rod and the first rod overlap and intersect, and the fourth rod and the second rod overlap and intersect. The third rod and the fourth rod are located on the inner and outer sides of the first single wave, forming an interlaced limiting structure between the rods of the first single wave and the second single wave.

[0014] In one embodiment, the extension includes a transition section and a flared main section, the transition section and the flared main section being arranged sequentially along the axial direction, and the flared main section being located on the proximal side of the extension. The limiting structure includes a first winding wire that is circumferentially wound around the flared main section.

[0015] In one embodiment, when the first winding wire winds two overlapping and intersecting wave rods, the lumen support includes a wound wave rod and a crossing wave rod. The first winding wire winds along the wound wave rod, and the crossing wave rod and the wound wave rod are wave rods overlapping and intersecting between different single waves. The first winding wire and the wound wave rod are respectively on the inner and outer sides of the crossing wave rod.

[0016] In one embodiment, the tubular body includes a support section and a compliant section, the support section being connected to one axial end of the compliant section and the support section being located on the proximal side of the compliant section, the extension section being connected to the support section, the support section including a support area and a connecting area, the support area and the connecting area being arranged circumferentially along the support section, and the support strength of the support area being greater than the support strength of the connecting area.

[0017] In one embodiment, the support area includes a first support area and a second support area, which are disposed opposite to each other and connected by the connecting area. The lumen support also includes a second winding wire, which is wound axially along the wave rod of the support area. The second winding wire is located in the first support area and is axially symmetrical with respect to the axis of symmetry of the first support area.

[0018] In one embodiment, the lumen support further includes a third winding wire, which is wound axially along the wave bar of the support region. The third winding wire is located in the second support region and is axially symmetrical with respect to the axis of symmetry of the second support region.

[0019] One technical effect of an embodiment of the present invention is that by limiting the inclination of the extension segment relative to the tubular body in the axial direction by the limiting structure, it is possible to prevent the proximal end of the extension segment from easily folding outward relative to the tubular body during the positioning stage of the lumen stent due to the radial inward squeezing force at the connection between the extension segment and the tubular body, which would affect the positioning of the lumen stent or even cause puncture of the blood vessel wall or poor stent deployment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the luminal stent provided by the present invention located in the iliac vein;

[0021] Figure 2 This is a schematic cross-sectional view of the iliac vein being compressed by the iliac artery and lumbosacral joint according to the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the lumen support provided in Embodiment 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the unfolded structure of the support unit provided in Embodiment 1 of the present invention;

[0024] Figure 4a This is a schematic diagram of the structure of two support units hooked together, as provided in Embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram showing the hook of the extension section (flared main section) being squeezed and folded outward during the release of the lumen stent;

[0026] Figure 6 This is a schematic diagram showing the hook of the extended segment (main flared segment) being squeezed outwards and folded inside the blood vessel during the deployment of the stent in the lumen;

[0027] Figure 7 This is a schematic diagram of the oblique-cut type lumen support provided in Embodiment 1 of the present invention;

[0028] Figure 8 This is a partial structural diagram of the lumen support provided in Embodiment 1 of the present invention;

[0029] Figure 9 for Figure 8 Cross-sectional view at point B;

[0030] Figure 9a for Figure 8 A schematic diagram of the staggered structure of the wave rods in the support unit M of the main flared section (spanning two wave crests);

[0031] Figure 10 This is a partial structural diagram of the lumen support provided in Embodiment 1 of the present invention;

[0032] Figure 10a for Figure 10 Enlarged view of point C in the middle;

[0033] Figure 11 This is a schematic diagram of the structure of the first winding wire of the lumen support provided in Embodiment 1 of the present invention wound to the extension section;

[0034] Figure 11a for Figure 11 Enlarged view at point D;

[0035] Figure 12 This is a partial structural diagram of the lumen support provided in Embodiment 2 of the present invention;

[0036] Figure 13 for Figure 12A schematic diagram of the staggered structure of the wave rods in the support unit K of the flared main section;

[0037] Figure 14 This is a partial structural diagram of the lumen support provided in Embodiment 3 of the present invention;

[0038] Figure 15 For along Figure 14 A schematic diagram of the structure with the axial centerline of the second support area cut open and laid flat.

[0039] Figure 16 This is a schematic diagram showing the distribution of the support area and connection area of ​​the lumen stent provided in Embodiment 3 of the present invention;

[0040] Figure 17 A schematic diagram illustrating the partial hooking connection method between adjacent support units provided by the present invention;

[0041] Figure 18 This is a schematic diagram of the connection structure provided by the present invention connecting adjacent support units.

[0042] Icon labels:

[0043] 100. Lumen support; 101. Support unit;

[0044] 110. Extension section; 111. First extension; 112. Second extension; 113. Transition section; 114. Flared main section; 1141. First single wave; 11411. First trough; 11412. First peak; 11413. Second trough; 11414. First wave leader; 11415. Second wave leader;

[0045] 1142, Second wave; 11421, Third trough; 11422, Second peak; 11423, Third peak; 11424, Third peak; 11425, Fourth peak;

[0046] 1143, Third wave; 11431, Fourth trough; 11432, Fourth peak; 11433, Fifth peak; 11434, Fifth peak; 11435, Sixth peak;

[0047] 1144. Wounded wave bar; 1145. Crossed wave bar;

[0048] 120. Support section; 130. Compliant section; 140. Tail section; 150. Limiting structure; 151. First winding wire; 160. Development point; 170. Spiral structure;

[0049] Example 2

[0050] 210. Extension section;

[0051] 213. Transition section; 214. Main flare section; 2141. First single wave; 21411. First trough; 21412. First crest; 21413. Second trough; 21414. First wave peak; 21415. Second wave peak; 2142. Second single wave; 21421. Third trough; 21422. Second crest; 21423. Third crest; 21424. Third wave peak; 21425. Fourth wave peak;

[0052] Example 3

[0053] 310. Extension section; 311. First extension; 312. Second extension;

[0054] 320. Support section; 321. Support area; 3211. First support area; 3212. Second support area; 322. Connecting area; 3221. First connecting area; 3222. Second connecting area;

[0055] 351. First winding wire;

[0056] 352. Second winding wire; 353. Third winding wire;

[0057] 361. Open-loop structure; 362. Closed-loop structure;

[0058] 37. Connection Structure

[0059] 1. Left iliac vein; 2. Right iliac vein; 3. Inferior vena cava; 4. Iliac artery; 5. Lumbosacral joint; 6. Collateral branch; 7. Sheath; Detailed Implementation

[0060] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0061] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0062] To more accurately describe the structural features and application characteristics of this invention, the terms "proximal," "distal," "anterior," and "posterior" are used as directional terms. "Proximal" indicates the end of the stent that is closer to the heart after implantation, and "distal" indicates the end of the stent that is farther from the heart after implantation. "Anterior" indicates the anterior end along the coronal plane, and "posterior" indicates the posterior end along the coronal plane.

[0063] It should be noted that the iliac veins include the left iliac vein 1 and the right iliac vein 2. The left iliac vein 1 and the right iliac vein 2 merge into the inferior vena cava 3. The iliac artery 4 is located anterior to the left iliac vein 1, and the lumbosacral joint 5 or lumbar vertebrae are located posterior to it. Figure 1-2 As shown, taking the implantation of a luminal stent 100 into the left iliac vein 1 as an example, and the implantation location is as follows: Figure 1 As shown, the proximal end of the luminal stent 100 extends into the inferior vena cava 3, and the tubular body of the luminal stent 100 is implanted into the left iliac vein 1.

[0064] This invention provides a tubular support 100 in the form of a mesh tube, such as... Figure 1-11 As shown, the lumen stent 100 is woven from braided yarns. The lumen stent 100 includes a tubular body 102 and an extension 110. The distal end of the extension 110 is connected to the proximal end of the tubular body 102, and the extension is woven from braided yarns. In this embodiment, the tubular body 102 includes a support section 120 and a compliant section 130. The support section 120 is connected to one axial end of the compliant section 130, and the support section 120 is located on the proximal side of the compliant section 130. The extension 110 is connected to the support section 120 at the proximal end of the tubular body 102.

[0065] To increase the visibility of the lumen stent 100 under X-rays, imaging points 160 can be provided at the crest of the proximal extension 110 and the trough of the distal tail 140 of the lumen stent 100. The imaging points 160 can be in the shape of an "I", a "V", or a dot. In this embodiment, the imaging points 160 are formed by winding braided wire around the inflection point of the crest or trough in a "V" shape, which can prevent the imaging points 160 formed by the winding braided wire from moving at the crest of the lumen stent 100. The imaging structure is made of woven wire or welded block material. The wire material can be tantalum, platinum, gold, or other materials with strong X-ray absorption. In this embodiment, tantalum wire can be used to weave the imaging wire into a "V" or inverted "V" shape at the crest of the proximal extension 110 and the trough of the distal tail 140 of the lumen stent.

[0066] Taking the implantation of a stent in the left iliac vein 1 as an example, after the stent is released within the vessel, the extension segment 110 adheres to the iliac cavity confluence and extends towards the inferior vena cava 3. The supporting segment 120 and the compliant segment 130 are located within the left iliac vein 1, with the compliant segment 130 located on the side of the supporting segment 120 away from the extension segment 110. The supporting segment 120 resists the combined compression from the anterior iliac artery 4 and the posterior lumbosacral joint 5. The supporting strength of the supporting segment 120 is greater than that of the compliant segment 130, so that the supporting segment 120 can maintain good support to resist the combined compression from the iliac artery 4 and the lumbosacral joint 5, preventing the supporting segment 120 of the luminal stent 100 from being compressed and deformed, thus avoiding left iliac vein 1 compression syndrome (IVCS).

[0067] The lumen support 100 is a tubular whole formed by sequentially connecting multiple support units 101 along the axial direction; that is, the support section 120, the compliant section 130, and the extension section 110 each include at least one support unit 101. Each support unit 101 includes a ring-shaped wave structure extending circumferentially, comprising crests and troughs, such as... Figure 4 As shown, adjacent support units 101 are staggered, with the crest of one support unit 101 connected to the trough of another support unit 101, forming a grid structure, as shown. Figure 4a As shown. It is understood that the wave coil structure of a support unit 101 can include multiple periodic waves in the circumferential direction, and the axial dimension of a support unit 101 is related to its wave height. Therefore, support unit 101 refers only to an annular wave coil structure, and there is no limitation on the axial dimension or the number of individual waves included in the circumferential direction of the support unit 101. Adjacent support units 101 can be connected by the mutual hooking of wave troughs and crests, or by connecting parts to form a tubular whole.

[0068] The luminal stent 100 also includes a tail section 140, located at the distal end of the tubular body 102, which may include 1 to 3 support units 101, such as... Figure 3 As shown, the tail end includes a support unit. The tail section 140 can be tapered to make its diameter 1-3 mm larger than that of the compliant section, thereby increasing the anchoring and wall-fitting properties of the lumen support tail section.

[0069] In this embodiment, the extension segment 110 gradually moves away from the central axis of the tubular body from its distal end to its proximal end, causing the extension segment 110 to tilt outward relative to the central axis of the tubular body, thereby making the circumferential surface of the extension segment 110 frustum-shaped from its distal end to its proximal end. The degree of conicity of this frustum-shaped shape is represented by the angle α between the inclined plane line of the extension segment 110 along its axial direction and the central axis of the tubular body. The larger the angle α, the greater the opening degree of the proximal end of the extension segment 110, given a fixed axial length. Taking an isosceles trapezoid as an example, the inclined plane line here is the straight line containing the legs of the isosceles trapezoid, such as... Figure 3 As shown, the degree of conicity α of the frustum satisfies: 10°≤α≤15°, where α can be any angle among 10°, 12°, 12.5°, 14°, or 15°. In this embodiment, taking a frustum-like shape with a beveled cut at the proximal end of the extension 110 as an example, its cross-section through the center is a non-isosceles trapezoid (based on an isosceles trapezoid, the base angle containing the other endpoint is obliquely cut off through one endpoint of the base), such as... Figure 7 Combination Figure 3 As shown, the definition of its conicity is based on the case where the cross section through the central axis is an isosceles trapezoid.

[0070] like Figure 3-4a As shown, to preserve the flexibility of the extension segment 110 relative to the tubular body for better fit at the iliac cavity confluence, a hook-and-loop connection between the extension segment 110 and the tubular body is generally used. During the release of the luminal stent 100, especially in the positioning phase, when the sheath 7 is positioned at the connection between the extension segment 110 and the tubular body, the extension segment 110 gradually moves away from the central axis of the tubular body from its distal to proximal end, causing it to tilt outward relative to the central axis of the tubular body. Since the extension segment 110 has been released, the distal end of the sheath 7 exerts radial inward pressure on this connection, which can easily cause the proximal end of the extension segment 110 to fold outward relative to the tubular body. This results in the proximal end of the extension segment 110 folding outward relative to the tubular body during the positioning of the luminal stent 100, affecting the positioning of the luminal stent and potentially causing puncture of the vessel wall. Damage to the vessel wall during the release of the luminal stent 100, such as… Figure 5-6 As shown. In this embodiment, there is no restriction on whether the tubular body 102 is formed by cutting or by weaving.

[0071] Other connection methods that do not affect the flexibility of the connection can also be used between the extension segment 110 and the tubular body 102. In order to satisfy the wall-hugging property of the extension segment 110 and retain the flexibility of the connection, regardless of the connection method, the proximal end of the extension segment 110 is likely to fold outward relative to the tubular body 102.

[0072] The stent 100 also includes a limiting structure 150, which limits the axial tilt of the extension segment 110 relative to the tubular body 102. Specifically, the limiting structure 150 prevents the proximal end of the extension segment 110 from folding outward relative to the tubular body 102, thereby preventing damage to the vessel wall during stent release. By providing the limiting structure 150, while ensuring flexibility at the connection point, the stent release process prevents the proximal end of the extension segment 110 from folding outward relative to the tubular body 102, thus limiting the axial tilt of the extension segment 110 relative to the tubular body 102, reducing the impact on stent positioning, and preventing potential damage to the vessel wall.

[0073] In this embodiment, the extension section 110 includes a first extension 111 and a second extension 112 arranged circumferentially opposite each other, wherein the axial dimension of the first extension 111 is larger than the axial dimension of the second extension 112, such that the second extension 112 forms a bevel shape relative to the axial direction of the tubular body 102 in the direction toward the first extension 111. The support section 120 and the compliant section 130 are disposed in an iliac vein branch. The first extension 111 can be used to fit against the side of the iliac vein branch that extends into the inferior vena cava 3, and the second extension 112 can be used to be close to the side of another iliac vein branch. Taking the release of the luminal stent 100 into the left iliac vein 1 as an example, the first extension 111 serves as an abutment portion, abutting at the iliac confluence of the left iliac vein 1 and the inferior vena cava 3, and extending into the inferior vena cava 3. The first extension 111 can be used to abut against the inner wall of the inferior vena cava 3 near the left iliac vein 1, thereby increasing the apposition of the luminal stent 100 at the iliac confluence. The second extension 112 is inclined towards the right iliac branch, and due to its conical design, the blood flow of the right iliac vein 2 is perpendicular or nearly perpendicular to the opening direction of the second extension 112, reducing the impact of the luminal stent 100 on the blood flow of the other iliac vein branch. The conical design of the extension segment 110 helps the proximal end of the luminal stent 100 better conform to the diameter change of the vessel at the iliac confluence, thereby increasing the abutment of the extension segment 110 at the junction of the left iliac vein 1 and the inferior vena cava 3, thus enhancing the apposition of the extension segment 110, promoting endothelialization, and reducing the risk of thrombosis.

[0074] Define β as the slope formed between the line connecting the nearest edge of the first extension 111 and the nearest edge of the second extension 112 and the radial section of the tubular body 102. Figure 8As shown, the slope β between the oblique cut and the radial section of the tubular body 102 satisfies: 10°≤β≤15°, where β can be any angle among 10°, 12°, 12.5°, 14°, or 15°. In other embodiments, the proximal end of the extension 110 can also be flat, meaning the axial dimension of the first extension 111 is equal to the axial dimension of the second extension 112. This is not limited, as long as the length of the second extension 112 does not reach the opposite blood vessel wall.

[0075] like Figure 7-9a As shown, in this embodiment, the extension section 110 includes a flared main section 114, which is located on the proximal side of the extension section 110. The flared main section 114 is the main flared part of the extension section 110. The extension section 110 also includes a transition section 113. The transition section 113 and the flared main section 114 are arranged sequentially along the axial direction. The proximal end of the transition section 113 is connected to the distal end of the flared main section 114, and the distal end of the transition section 113 is connected to the proximal end of the tubular body 102. The flared main section is hooked and connected to the extension section.

[0076] The taper of the transition section 113 is equal to the taper of the flared main section 114, or the taper of the transition section 113 is less than the taper of the flared main section 114, and the angle difference between their taper degrees is within the range of 0 to 2°. The transition section 113 includes at least one support unit 101, and the flared main section 114 includes a larger support unit M, such as... Figure 8-9a As shown, the larger support unit 101 here refers to the fact that the maximum axial height of the support unit 101 of the flared main section 114 is greater than the axial height of the support unit 101 of the transition section 113. Setting the maximum axial height of the support unit 101 selected for the flared main section 114 to be greater than that of the support unit 101 of the transition section 113 serves two purposes: firstly, it reduces the number of support units 101 required to be woven in the extension section 110 while still achieving the required extension dimensions; secondly, it facilitates the formation of a height difference between the axial heights of the first extension 111 and the second extension 112, creating a beveled cut. This allows the proximal end of the extension section 110 to have a beveled structure, reducing the impact on blood flow to the two branches of the right iliac vein.

[0077] The flared main section 114 includes a first single wave 1141, which includes a first trough 11411, a first crest 11412, a second trough 11413, a first wave rod 11414, and a second wave rod 11415. The first trough 11411 and the second trough 11413 are located on both sides of the first crest 11412. The first crest 11412 and the first trough 11411 are connected by the first wave rod 11414, and the first crest 11412 and the second trough 11413 are connected by the second wave rod 11415. Thus, the first trough 11411, the first crest 11412, the second trough 11413, the first wave rod 11414, and the second wave rod 11415 form a complete trough-to-trough periodic single wave. The first wave rod 11414 and the second wave rod 11415 converge at the proximal ends of the first wave trough 11411 and the second wave trough 11413 (on the side axially away from the central axis) to form the first wave crest 11412. The first wave trough 11411 and the second wave trough 11413 are respectively hooked and connected to the two wave crests of the transition section 113, and at least one wave crest at the proximal end of the transition section 113 spans between the first wave trough 11411 and the second wave trough 11413, such that at least one wave trough of another single wave of the flared main section 114 is included between the first wave trough 11411 and the second wave trough 11413. That is, at least one wave crest of the adjacent support unit 101 spans between the first wave trough 11411 and the second wave trough 11413.

[0078] A single wave refers to a periodic wave formed by a portion of the wave loop between a wave crest and its adjacent crest on the same wave loop. Alternatively, a single wave refers to a periodic wave formed by a portion of the wave loop between a wave trough and its adjacent trough on the same wave loop. Simply put, a single wave can be a periodic wave region between two adjacent wave crests or between two adjacent wave troughs. Of course, a single wave is not limited to a periodic wave from crest to crest or from trough to trough. In this embodiment, for ease of description, a single wave is a periodic wave formed by a portion of the wave loop between a wave crest and its adjacent crest on the same wave loop, or a periodic wave formed by a portion of the wave loop between a wave trough and its adjacent trough on the same wave loop.

[0079] The flared main section 114 forms a support unit M along the circumferential direction in the form of spanning two wave crests. The flared main section 114 includes a first single wave 1141 and multiple wave rods that overlap and intersect with the first single wave 1141. At least one wave rod that overlaps and intersects with the first single wave 1141 and at least one other wave rod that overlaps and intersects with the first single wave 1141 are located on the inner and outer sides of the first single wave 1141, such as... Figure 9a As shown in the diagram. The support unit M is cut open and laid flat along the axial direction. Figure 9a As shown.

[0080] In this embodiment, the first trough 11411 and the second trough 11413 are separated by two peaks across the transition section 113. The flared main section 114 also includes a second single wave 1142 and a third single wave 1143. The second single wave 1142 includes a third trough 11421, a second peak 11422, a third peak 11423, a third peak 11424, and a fourth peak 11425. The third trough 11421 is located between the first trough 11411 and the second trough 11413 and is close to the first trough 11411 (the third trough 11421 is located between the first trough 11411 and the fourth trough 11431). The second peak 11422 and the third peak 1142... 3 are located on both sides of the third trough 11421. The third trough 11421 and the second peak 11422 are connected by the third wave rod 11424. The third trough 11421 and the third peak 11423 are connected by the fourth wave rod 11425. That is, the third trough 11421, the second peak 11422, the third peak 11423, the third wave rod and the fourth wave rod 11425 form a complete second single wave 1142 from peak to peak. The third single wave 1143 includes a fourth trough 11431, a fourth peak 11432, a fifth peak 11433, a fifth stem 11434, and a sixth stem 11435. The fourth trough 11431 is located between the third trough 11421 and the second trough 11413. The fourth peak 11432 and the fifth peak 11433 are located on both sides of the third trough 11421. The third trough 11421 and the fourth peak 11432 are connected by the fifth stem 11434, and the third trough 11421 and the fifth peak 11433 are connected by the sixth stem 11435. Thus, the fourth trough 11431, the fourth peak 11432, the fifth peak 11433, the fifth stem 11434, and the sixth stem 11435 form a complete peak-to-peak third single wave 1143.In this configuration, the third wave rod of the second single wave 1142 and the fifth wave rod 11434 of the third single wave 1143 overlap and intersect with the first wave rod 11414 of the first single wave 1141, respectively; the fourth wave rod 11425 of the second single wave 1142 and the sixth wave rod 11435 of the third single wave 1143 overlap and intersect with the second wave rod 11415 of the first single wave 1141, respectively; the third wave rod and the fifth wave rod 11434 are respectively on the inner and outer sides of the first single wave 1141 (first wave rod 11414); or the third wave rod and the fifth wave rod 11434 are on the same side of the first single wave 1141 (first wave rod 11414), and at least one of the fourth wave rod 11425 and the sixth wave rod 11435 is on the inner and outer sides of the first single wave 1141, that is, the fourth wave rod 11425 and / or the sixth wave rod 11435 are on the inner and outer sides of the first single wave 1141, respectively. The wave rods are located on the inner and outer sides of the first single wave 1141 (the third single wave 1143 and the fifth single wave are located inside the first wave rod 11414, and the fourth wave rod 11425 and / or the sixth wave rod 11435 are located outside the second wave rod 11415; or the third single wave 1143 and the fifth single wave are located outside the first wave rod 11414, and the fourth wave rod 11425 and / or the sixth wave rod 11435 are located inside the second wave rod 11415), forming an interlocking limiting structure 150 between the wave rods of the first single wave 1141, the second single wave 1142, and the third single wave 1143, so as to mutually constrain each other, thereby limiting the outward tilting of the wave rods in the circumferential direction that may cause them to flip over with the wave trough as the fulcrum, so as to better position the lumen support. During the release process, the tilt of the extension section 110 relative to the tubular body 102 in the axial direction can be limited without increasing the loading volume.

[0081] In this embodiment, a transition section 113 is provided based on the aforementioned limiting structure 150. The limiting structure 150 can limit the inclination of the flared main section 114 relative to the tubular body 102 in the axial direction. At the same time, the provision of the transition section 113 can retain the compliance of the extension section 110 relative to the support section 120. The increased compliance of the transition section 113 relative to the support section 120 is independent of the limiting effect of the limiting structure 150. It retains the compliance at the connection between the extension section 110 and the support section 120 and plays a transitional role, increasing the compliance of the lumen stent 100 when it adheres to the wall at the iliac cavity confluence.

[0082] like Figure 10-11aAs shown, in other embodiments, the limiting structure 150 can also be a braided filament wound around the wave bar in the circumferential direction of the flared main section 114. The limiting structure 150 includes a first winding filament 151 wound in the circumferential direction of the flared main section 114. It can be understood that the limiting structure 150 can be configured to have at least one wave bar overlapping and intersecting with the first single wave 1141 and at least one other wave bar overlapping and intersecting with the first single wave 1141 on the inner and outer sides of the first single wave 1141; it can be configured to have only the first winding filament 151; or it can be a combination of both, that is, at least one wave bar overlapping and intersecting with the first single wave 1141 and at least one other wave bar overlapping and intersecting with the first single wave 1141 on the inner and outer sides of the first single wave 1141. A first winding wire 151 is provided on the inner and outer sides of the single wave 1141. The first winding wire 151 restricts the outward folding between the hook connection of the main flare section 114 and the transition section 113. At the same time, the hook connection between the transition section 113 and the support section 120 is also not easy to fold outward because the proximal end of the transition section 113 is restricted by the main flare section 114. That is, the first winding wire 151 increases the restriction on the axial inclination of the extension section 110 relative to the tubular body 102, which can prevent the positioning of the lumen stent from being affected during the release process, and prevent damage to the inner wall of the blood vessel or poor deployment of the lumen stent 100 that may be caused by the folding of the extension section 110 relative to the tubular body 102.

[0083] It is understandable that when the first winding wire 151 winds around two overlapping and intersecting wave rods, the lumen support 100 includes a wound wave rod 1144 and a crossing wave rod 1145. The first winding wire 151 winds along the wound wave rod 1144, and the crossing wave rod 1145 overlaps and intersectes with the wound wave rod 1144, representing different single waves. The first winding wire 151 and the wound wave rod 1144 are located on the inner and outer sides of the crossing wave rod 1145, respectively. This increases the restriction of the overlapping and intersecting wave rods by the first winding wire 151, thereby increasing the restriction on the axial inclination of the extension section 110 relative to the tubular body 102. Figure 10a As shown, taking the first winding wire 151 wound around the fourth wave rod 11425 of the second single wave 1142 as an example, the fourth wave rod 11425 is the wound wave rod 1144, and the cross wave rod 1145 corresponding to the fourth wave rod 11425 is the second wave rod 11415 of the first single wave 1141 and the fifth wave rod 11434 of the third single wave 1143. Figure 9a As shown.

[0084] In other embodiments, the first winding wire 151 may also be wound sequentially in the circumferential direction along the wave bar of the transition section 113 and the flared main section 114, such as... Figure 11 Combination Figure 11a As shown, the axial inclination of the extension 110 relative to the tubular body is further restricted.

[0085] It is understandable that when the transition section 113 is not provided, the far end of the extension section 110 is directly hooked and connected to the near end of the support section 120. The extension section 110 includes the first single wave 1141, the second single wave 1142 and the third single wave 1143 as described above, and the two troughs of the first single wave 1141 are hooked and connected to the two peaks of the support section 120 respectively, and the first trough 11411 and the second trough 11413 cross the two peaks of the near end of the support section 120.

[0086] When the first trough 11411 and the second trough 11413 cross two peaks of the transition segment 113 (or support segment 120), the number of troughs of the extension segment 110 can be selected as 3n+1 or 3n+2 (where N is a positive integer). In the iliac vein stent, the number of troughs of the extension segment 110 can be selected as 7, 8, 10, 11, 13, 14 or 16, etc., so that when the extension segment 110 crosses the wave in the circumferential direction, it will not be repeatedly woven on the same peak of the transition segment 113 (or support segment 120).

[0087] In a waveform structure, a wave ring with a large wave angle (the angle formed by adjacent wave bars at the crest or trough) can provide stronger radial support force. That is, a large wave angle has a stronger resistance to deformation and requires greater compressive force to produce deformation, thus having greater support performance. In this embodiment, the wave angle of the support section 120 can be set to be greater than that of the compliant section 130 so that the strength of the support section 120 is greater than that of the compliant section 130.

[0088] The radial support force of the support section 120 can be made greater than that of the compliant section 130 by setting the wave angle of the support section 120 to be different from that of the compliant section 130. For ease of weaving, in this embodiment, as... Figure 7 As shown, the number of single waves contained in the circumferential direction of the wavering of the support section 120 is the same as the number of single waves in the circumferential direction of the wavering of the compliant section 130, that is, the single wave period is the same. By setting the wavering of the support section 120 and the wavering of the compliant section 130 to have different heights in the axial direction, the wave angle of the support section 120 is greater than that of the compliant section 130, so that the radial support force of the support section 120 is greater than that of the compliant section 130, and the support section 120 has a certain support.

[0089] The resistance to deformation between different regions along the axial direction can be tested using a radial force tester with a radial gripping test method to measure the radial support force, thereby obtaining the magnitude of the resistance to deformation in different regions along the axial direction of the lumen stent 100. Specifically, at 37℃±2℃, the radial force tester is used to load different sections of the stent along the axial direction and perform a gripping test to obtain the resistance of the stent to the instrument gripping. The radial force value of the stent with a radial compression rate of 20% on the test curve is collected to calculate the radial support force per unit length, thereby characterizing the radial support performance of the lumen stent.

[0090] The lumen stent 100 also includes a helical structure 170, which is woven into the lumen stent 100 by being helically wound along the axial direction, thereby forming a keel and restricting the relative axial movement between adjacent support units 101 of the lumen stent 100, thus limiting the axial length of the lumen stent 100 and preventing axial shortening when the lumen stent 100 is released. In this embodiment, the helical structure 170 is wound along the wave bar from the distal end of the lumen stent 100 and extends to the proximal end.

[0091] To prevent the braided ends of the stent 100 from scratching the sheath 7 of the delivery device or irritating the blood vessel wall after implantation, the ends of the braided ends can be treated by spheroidizing and polishing to make them smooth. Alternatively, they can be coated with a PTFE (polytetrafluoroethylene) membrane and then heat-treated. No restrictions are placed on this.

[0092] In this embodiment, combined with Figure 7 As shown, the number of support units N in the support section 120 arranged axially can be the same as or different from the number of support units Q in the compliant section 130 arranged axially. This number can be determined based on the axial height of the support units 101 in that section and the actual required length of the tube support 100 in that section, and is not limited here. In this embodiment, the support units N in the support section 120 can be selected to be 13, 14, 15, or 16 axially, the number of crests can be selected to be 7, 10, or 13, and the wave height can be selected within the range of 2.4mm to 3mm, specifically 2.4mm, 2.6mm, 2.8mm, or 3mm.

[0093] Accordingly, the first mesh is defined by two opposing single waves of two adjacent support units N in the support segment 120, and the second mesh is defined by two opposing single waves of two adjacent support units Q in the compliant segment 130. Since the wave periods of the wave loops formed by the support units N of the support segment 120 and the support units Q of the compliant segment 130 are the same, and the number of waves along the circumferential direction is the same, and by setting the wave loops of the support segment 120 and the compliant segment 130 to have different axial heights, the wave angle of the support segment 120 is greater than that of the compliant segment 130. Therefore, the mesh area of ​​the first mesh is smaller than that of the second mesh. The smaller mesh area of ​​the first mesh helps to compress any potential vascular intima fragments, mural thrombi, or venous ridges against the vessel wall, preventing them from entering the vessel lumen and disrupting blood flow or moving with the blood flow to the pulmonary artery and causing pulmonary embolism. The larger mesh area of ​​the compliant segment helps to reduce the obstruction of the collateral 6 at the corresponding position, ensuring smooth blood return from the collateral 6.

[0094] Example 2

[0095] Example 2 provides another type of lumen stent, such as Figure 12-13 As shown, the features that are the same or can be reused in the lumen support of Embodiment 2 and Embodiment 1 will not be described again here. The main difference is that in this embodiment, the first trough 21411 and the second trough 21413 of the first single wave 2141 cross a peak of the transition section 213 (or support section). The flared main section 214 forms a support unit K in the circumferential direction in the form of crossing a peak. The support unit K includes the first single wave 2141 and two wave rods that overlap and intersect with the first single wave 2141. The two wave rods that overlap and intersect with the first single wave 2141 are respectively on the inner and outer sides of the first single wave 2141, as shown. Figure 13 As shown.

[0096] The first single wave 2141 includes a first trough 21411, a first peak 21412, a second trough 21413, a first stem 21414, and a second stem 21415. The first trough 21411 and the second trough 21413 are located on either side of the first peak 21412. The first peak 21412 and the first trough 21411 are connected by the first stem 21414, and the first peak 21412 and the second trough 21413 are connected by the second stem 21415. Thus, the first trough 21411, the first peak 21412, the second trough 21413, the first stem 21414, and the second stem 21415 form a complete trough-to-trough periodic single wave. The first wave rod 21414 and the second wave rod 21415 converge at the near end of the first wave trough 21411 and the second wave trough 21413 (on the side away from the central axis) to form the first wave peak 21412.

[0097] The flared main section 214 also includes a second single wave 2142, which includes a third trough 21421, a second peak 21422, a third peak 21423, a third peak 21424, and a fourth peak 21425. The third trough 21421 is located between the first trough 21411 and the second trough 21413, and the second peak 21422 and the third peak 21423 are located at the third trough 21421. On both sides of the circumference, the third trough 21421 and the second peak 21422 are connected by the third wave rod 21424, and the third trough 21421 and the third peak 21423 are connected by the fourth wave rod 21425. That is, the third trough 21421, the second peak 21422, the third peak 21423, the third wave rod 21424 and the fourth wave rod 21425 form a complete second single wave 2142 from peak to peak. In this design, the third wave rod 21424 of the second single wave 2142 overlaps and intersects with the first wave rod 21414 of the first single wave 2141, and the fourth wave rod 21425 of the second single wave 2142 overlaps and intersects with the second wave rod 21415 of the first single wave 2141. The third wave rod 21424 and the fourth wave rod 21425 are located on the inner and outer sides of the first single wave 2141, forming an interlocking limiting structure between the wave rods of the first single wave 2141 and the second single wave 2142. This mutually restricts the outward tilting of the first single wave 2141 and the second single wave 2142, which may cause them to overturn with the trough as the fulcrum. This limits the outward tilting of the trough of the main segment 214 when it is squeezed by the sheath. During the release process, this can limit the axial tilt of the extension segment 210 relative to the tubular body, and prevent damage to the inner wall of the blood vessel or poor deployment of the lumen stent that may result from the overturning of the extension segment 210 relative to the tubular body during the release process.

[0098] Example 3

[0099] Example 3 provides another type of lumen stent, such as Figure 14-16As shown, the same or interchangeable features of the lumen stent in Embodiment 3 and the lumen stent in Embodiment 1 will not be described again here. The main difference is that in this embodiment, the support section 320 includes a support area 321 and a connecting area 322. The support area 321 and the connecting area 322 are arranged circumferentially along the support section 320 and are spaced apart from each other. The support strength of the support area 321 is greater than the support strength of the connecting area 322. The support area 321 includes a first support area 3211 and a second support area 3212. The first support area 3211 and the second support area 3212 are arranged opposite to each other, and the first support area... 3211 and the second support area 3212 are connected by a connecting area; the connecting area 322 includes a first connecting area 3221 and a second connecting area 3222, the first connecting area 3221 and the second connecting area 3222 are arranged opposite to each other, and the support area 321 and the connecting area 322 are arranged in sequence along the circumference of the support segment 320 according to the first support area 3211, the first connecting area 3221, the second support area 3212 and the second connecting area 3222, so that the first connecting area 3221 is attached to the inner wall of the blood vessel on the side near the lumbosacral joint, and the second connecting area 3222 is attached to the inner wall of the blood vessel on the side near the iliac artery.

[0100] The central angle d of the first support area 3211 and the second support area 3212 can be in the range of 60° to 120°. For example, the central angle d of the first support area 3211 and the second support area 3212 can be 60°, 90° or 120°. The support strength of the support area is set to be greater than that of the connecting area, so that the first support area 3211 and the second support area 3212 can provide better support between the iliac artery and the lumbosacral joint in front of and behind the left iliac vein to resist the compression from the anterior iliac artery and the posterior lumbosacral joint. This allows the first support area 3211 and the second support area 3212 to maintain the radial support height of the luminal stent in the anterior-posterior direction, so as to ensure the effectiveness of the luminal stent.

[0101] In this embodiment, such as Figure 14-16 As shown, the first support area 3211, the second support area 3212, the first connecting area 3221, and the second connecting area 3222 can be divided into four equal parts, as follows: Figure 16 As shown, the central angles of the first support area 3211, the second support area 3212, the first connecting area 3221, and the second connecting area 3222 are all 90°. The first extension 311 and the second extension 312 of the extension segment 310 are bisected (the central angles are all 180°). The first support area 3211 corresponds to the middle part of the first extension 311, and the second support area 3212 corresponds to the middle part of the second extension 312.

[0102] The lumen support also includes a second winding wire 352, which is wound axially along the wave bar of the support area. The second winding wire 352 is located in the first support area 3211 and is axially symmetrical with respect to the axis of symmetry of the first support area 3211. This can improve the support rigidity of the first support area 3211 and provide auxiliary support for the first support area 3211 in the front-rear direction. Based on the consistent waveform of the support area and the connecting area, the auxiliary support of the second winding wire and / or the third winding wire can make the support strength of the second support area greater than that of the connecting area. The lumen support also includes a third winding wire 353, which is wound axially along the wave bar of the support area. The third winding wire 353 is located in the second support area 3212 and is axially symmetrical with respect to the axis of symmetry of the second support area 3212. This can improve the support rigidity of the first support area 3211 and provide auxiliary support for the second support area 3212 in the front-rear direction. In this embodiment, the second winding yarn 352 and / or the third winding yarn 353 are integrally woven with the first winding yarn 351, such as... Figure 14-15 As shown, since the second winding wire 352 and / or the third winding wire 353 are integrally woven with the first winding wire 351, the winding wire crosses the extension section 310 and the tubular body. During the release of the lumen support, the integrally woven winding wire crosses the turning fulcrum (the connection between the flared main section and the transition section) axially, which can limit the outward folding, further preventing the proximal end of the extension section 310 from folding outward relative to the tubular body, further limiting the axial inclination of the extension section 310 relative to the tubular body, and simultaneously improving the support performance of the first support area 3211 and / or the second support area 3212 in the front-back direction. It can be understood that when the second winding wire is wound in a symmetrical rhombus shape in the first support area 3211, and the third winding wire is wound in a symmetrical rhombus shape in the second support area 3212, and both the second winding wire 352 and the third winding wire 353 are integrally woven with the first winding wire 351, the effect of limiting the axial inclination of the extension section 310 relative to the tubular body is best. Figure 15 As shown, the second and third braided wires are woven in a diamond shape along the wave bar, which can smoothly weave with the first winding wire 351 and form a wave angle that resists compression in the front and back direction, thereby increasing the support strength in the front and back direction. This makes the support strength of the support area greater than the support strength of the connection area. The second winding wire and / or the third winding wire are woven together with the first winding wire, which can make the weaving smooth and not increase the weaving difficulty.

[0103] Since the support strength of the support area is greater than that of the connection area, it can be understood that areas with greater support strength have poorer flexibility, while areas with less support strength have better flexibility. That is, the first support area 3211 and the second support area 3212 provide better support so that the support segment 320 has better resistance to deformation. At the same time, the first connection area 3221 and the second connection area 3222 maintain a certain degree of flexibility. Because the first connection area 3221 and the second connection area 3222 have good flexibility, when the first connection area 3221 and the second connection area 3222 are in contact with the anterior and posterior iliac arteries and lumbar arteries... When the sacral joint compresses the vessel wall, the first connecting region 3221 and the second connecting region 3222 have good deformability to increase the contact area between the connecting region of the support segment 320 and the anterior and posterior vessel walls, thereby reducing the pressure of the support segment 320 on the anterior and posterior vessel walls. Simultaneously, the relatively positioned first and second support regions 3211 and 3212 provide good radial support in the anterior-posterior direction, ensuring that the support segment 320 of the stent has good deformability and sufficient support strength in the anterior-posterior direction, thus guaranteeing blood flow within the stent. Figure 16 As shown.

[0104] In other embodiments, two adjacent support units 101 are partially hooked together to connect them. Two adjacent diamond-shaped mesh openings at the unhooked positions are interconnected, forming an open-loop structure 361 for each mesh opening and a closed-loop structure 362 between the diamond-shaped mesh openings hooked on all sides. This increases the flexibility of the hooked braided support. For example, adjacent support units in the flexible section can be partially hooked together. Figure 17 As shown. Adjacent support units 101 can also be connected by a connecting structure 37. The connecting structure connects the crests and troughs of adjacent support units 101. The material of the connecting structure can be selected with an elastic modulus lower than that of the wave rod forming the wave ring, such as PTFE, FEP (perfluoroethylene propylene copolymer), or nylon, to give the connecting structure better deformability and increase the flexibility of the support. The connecting structure can be prepared on the lumen support by stitching, fusion, or spraying, such as... Figure 18 As shown. The connecting structure 37 can also be made of a biodegradable material, such as polylactic acid, polyglycolic acid or polyester. In the early stage of luminal stent assembly and implantation, the compliant segment is a single structure connected by the connecting structure, which facilitates assembly and reshaping of the vascular morphology. As the implantation time increases, the connecting structure 37 gradually degrades, and the flexibility increases relatively, which facilitates conforming to the vascular anatomy and reduces the possibility of rupture during long-term service of the luminal stent.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A lumen stent, characterized in that, The lumen stent includes a tubular body and an extension segment. The extension segment is woven from braided yarns. The distal end of the extension segment is connected to the proximal end of the tubular body. The extension segment and the tubular body are hooked together. The extension segment gradually moves away from the central axis of the tubular body from its distal end to its proximal end so that the extension segment is tilted outward relative to the tubular body. The lumen stent also includes a limiting structure for limiting the axial tilt of the extension segment relative to the tubular body.

2. The lumen stent according to claim 1, characterized in that, The extension section includes a transition section and a flared main section, which are arranged sequentially along the axial direction. The flared main section is located on the proximal side of the extension section. The flared main section includes a first single wave and a plurality of wave rods that overlap and intersect with the first single wave. At least one wave rod that overlaps and intersects with the first single wave and at least one other wave rod that overlaps and intersects with the first single wave are located on the inner and outer sides of the first single wave.

3. The lumen stent according to claim 2, characterized in that, The first single wave includes a first trough, a first crest, a second trough, a first peak, and a second peak. The first trough and the second trough are located on both sides of the first crest in the circumferential direction. The first crest and the first trough are connected by the first peak, and the first crest and the second trough are connected by the second peak. The first trough and the second trough are respectively hooked to two peaks of the transition section, and at least one peak near the end of the transition section spans between the first trough and the second trough.

4. The lumen stent according to claim 3, characterized in that, The transition section spans two peaks between the first and second troughs. The flared main section also includes a second and a third single wave. The second single wave includes a third trough, a second peak, a third peak, a third wave rod, and a fourth wave rod. The third trough is located between and close to the first trough. The second peak and the third peak are located on opposite sides of the third trough. The third trough and the second peak are connected by the third wave rod, and the third trough and the third peak are connected by the fourth wave rod. The third single wave includes a fourth trough, a fourth peak, a fifth peak, a fifth rod, and a sixth rod. The fourth trough is located between the third trough and the second trough. The fourth peak and the fifth peak are located on opposite sides of the third trough. The third trough and the fourth peak are connected by the fifth rod, and the third trough and the fifth peak are connected by the sixth rod. The third rod and the fifth rod overlap and intersect with the first rod, and the fourth rod and the sixth rod overlap and intersect with the second rod. The third wave rod and the fifth wave rod are respectively located on the inner and outer sides of the first single wave, so that the wave rods of the first single wave, the second single wave and the third single wave form an interlocking limiting structure; Alternatively, the third wave rod and the fifth wave rod are on the same side of the first single wave, and at least one of the fourth wave rod and the sixth wave rod is on the inner and outer sides of the first single wave, so that the wave rods of the first single wave, the second single wave and the third single wave form an interlocking limiting structure.

5. The lumen stent according to claim 3, characterized in that, The flared main section also includes a second single wave, which includes a third trough, a second peak, a third peak, a third rod, and a fourth rod. The third trough is located between the first trough and the second trough. The second peak and the third peak are located on the circumferential sides of the third trough. The third trough and the second peak are connected by the third rod, and the third trough and the third peak are connected by the fourth rod. The third rod and the first rod overlap and intersect, and the fourth rod and the second rod overlap and intersect. The third rod and the fourth rod are on the inner and outer sides of the first single wave, so that the rods of the first single wave and the second single wave form an interlaced limiting structure.

6. The lumen stent according to claim 1, characterized in that, The extension section includes a transition section and a flared main section, which are arranged sequentially along the axial direction, and the flared main section is located on the proximal side of the extension section. The limiting structure includes a first winding wire that is wound around the flared main section circumferentially.

7. The lumen stent according to claim 6, characterized in that, When the first winding wire winds two overlapping and intersecting wave rods, the lumen support includes a wound wave rod and a crossing wave rod. The first winding wire winds along the wound wave rod. The crossing wave rod and the wound wave rod are wave rods that overlap and intersecte between different single waves. The first winding wire and the wound wave rod are respectively on the inner and outer sides of the crossing wave rod.

8. The lumen stent according to claim 7, characterized in that, The tubular body includes a support section and a compliant section. The support section is connected to one axial end of the compliant section, and the support section is located on the proximal side of the compliant section. The extension section is connected to the support section. The support section includes a support area and a connecting area, which are arranged circumferentially along the support section. The support strength of the support area is greater than the support strength of the connecting area.

9. The lumen stent according to claim 8, characterized in that, The support area includes a first support area and a second support area, which are arranged opposite to each other and connected by the connecting area. The lumen support also includes a second winding wire, which is wound axially along the wave rod of the support area. The second winding wire is located in the first support area and is axially symmetrical with respect to the axis of symmetry of the first support area.

10. The lumen stent according to claim 9, characterized in that, The lumen support also includes a third winding wire, which is wound axially along the wave rod of the support area. The third winding wire is located in the second support area and is axially symmetrical with respect to the axis of symmetry of the second support area.

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