Lumen stent

Abstract

This invention relates to the field of interventional medical devices and provides a lumen stent, comprising a main body, the main body including a main stent and a covering membrane on the main stent; and a bare stent waveguide fixed to the main body, the bare stent waveguide located proximally to the main body and inside the covering membrane, the bare stent waveguide including free waves, the free waves being not fixed to the covering membrane. The lumen stent provided by this invention, by setting bare stent waveguides including free waves, and each free wave being not fixed to the covering membrane, allows the free waves to flip relative to the covering membrane of the lumen stent body towards the side away from the covering membrane. This prevents the free waves from being pulled by the hooks of the post-release structure for fixation, thus avoiding constriction at the proximal end of the covering membrane.

Description

Technical Field

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

[0002] like Figure 1 As shown, thoracic and abdominal aortic aneurysm a is a common aortic disease. The main existing treatments for thoracic and abdominal aortic aneurysms include traditional open surgery and endovascular repair. Endovascular repair has advantages such as minimal trauma, short operation and hospitalization time, rapid postoperative recovery, and low complication rate. However, the biggest limitation of endovascular repair is that the visceral arteries (including celiac trunk a1, superior mesenteric artery a2, and renal artery a3) cannot be covered. This requires reconstruction of the visceral arteries. The reconstruction method is to implant a thoracic and abdominal main aortic stent 100'. The thoracic and abdominal main aortic stent 100' is specifically designed for thoracic and abdominal aortic aneurysm a. In addition to a main body 10', the thoracic and abdominal main aortic stent 100' also has an opening structure or a branch structure. Taking the branch structure as an example, the branch structure is divided into two types: internal branch 11' and external branch 12'. During the actual surgery, the thoracic and abdominal main cavity stent 100' is loaded and delivered to the lesion site via the delivery device 5'. After the thoracic and abdominal main cavity stent 100' is released, the guidewire 2', sheath 3', catheter, and other superselective visceral artery branch instruments are inserted into the main body 10' from the proximal end of the thoracic and abdominal main cavity stent 100', then pass through the branches on the inner wall of the main body 10', and then superselectively enter the visceral artery vessel that needs reconstruction. (See also...) Figure 2 After the guidewire 2' path is established, the bridging stent 13' is inserted through the delivery device 5' and then released to bridge the openings or branch structures of various visceral arteries such as the celiac trunk a1, superior mesenteric artery a2, and renal artery a3, as well as the thoracic and abdominal main cavity stent 100', in order to reconstruct the blood supply of each visceral artery.

[0003] To ensure stable deployment, the thoracic and abdominal main cavity stent 100' has a post-deployment structure. This post-deployment structure refers to a hook 51' at the front end of the delivery device 5' and an exposed bare stent coil 52' at the proximal end of the thoracic and abdominal main cavity stent 100'. The bare stent coil 52' can be hooked onto the hook 51'. Because the proximal end of the thoracic and abdominal main cavity stent 100' is fixed by the hook 51', it will not shift during deployment. Furthermore, when reconstructing visceral vascular branches after deployment of the thoracic and abdominal main cavity stent 100', the bare stent coil 52' being fixed to the hook 51' also ensures that during reconstruction, the instruments for reconstructing the branches will not shift within the thoracic and abdominal main cavity stent 100'. However, because the bare stent coil 52' is... The constricting effect of the hook 51' causes a narrowing of the proximal opening of the thoracic and abdominal main cavity stent 100', making it difficult for reconstruction branch instruments to enter due to the smaller opening. Simultaneously, the dense wave rods on the bare stent wave loop 52' divide the instrument inlet (i.e., the proximal opening of the thoracic and abdominal main cavity stent 100') into multiple regions, each with a relatively small area, further narrowing the entry and exit channels for reconstruction branch instruments and severely interfering with their operation. Furthermore, the excessively high wave rod height of the bare stent wave loop 52' above the proximal end face of the thoracolumbar graft 13' of the thoracic and abdominal main cavity stent 100' exacerbates vascular irritation. Existing technologies, to reduce the impact of the bare stent wave loop, overlap the bare stent wave loop with the proximal end of the graft, reducing the height of the bare stent wave loop above the proximal end face of the graft, or lowering the wave height of the bare stent wave loop. However, both of these improvements exacerbate the narrowing phenomenon at the proximal end of the luminal stent graft. Summary of the Invention

[0004] The purpose of this invention is to provide a luminal stent that addresses the technical problem that design flaws in existing thoracic and abdominal luminal stents can interfere with the operation of reconstructive branch instruments.

[0005] The present invention is implemented as follows: a lumen stent, comprising:

[0006] A lumen stent, characterized in that it comprises:

[0007] The main body includes a main support and a film covering the main support;

[0008] A bare stent waveguide is fixed to the main body and located near the proximal end of the main body and inside the membrane. The bare stent waveguide includes a free wave, which is not fixed to the membrane.

[0009] In one embodiment of the present invention, the bare stent wavelet further includes a plurality of fixed waves connected to the free wave. The fixed waves are fixed to the proximal end of the membrane and located within the region of the membrane. The height of the free wave is higher than the height of the fixed waves, so that the free wave protrudes from the proximal end face of the membrane.

[0010] In one embodiment of the present invention, at least two free waves are provided and are symmetrically arranged around the circumferential center of the near end of the main body; the fixed wave and the free wave are connected in succession and form a ring.

[0011] In one embodiment of the present invention, the main support includes a plurality of metal corrugated rings spaced apart along the axial direction, and the metal corrugated ring closest to the bare support corrugated ring is the first corrugated ring, which includes a support crest corresponding to the free wave.

[0012] In one embodiment of the present invention, the bare stent waveband further includes a fixed waveband, the free wave is connected to the fixed waveband, the fixed waveband includes multiple alternating peaks and troughs, the height of the peaks of the fixed waveband is less than the height of the peaks of the free wave, and the fixed waveband is fixed on the film and located within the area of ​​the film.

[0013] In one embodiment of the present invention, the peaks of the fixed wave loop are of the same height, and the free wave is connected to the fixed wave loop at a position close to the trough of the fixed wave loop.

[0014] or,

[0015] The free wave is connected to the trough of the fixed wave loop.

[0016] In one embodiment of the present invention, the bare stent waveband further includes a fixed waveband, which is a ring-shaped mesh structure. The free wave is fixed on the fixed waveband, and the fixed waveband is fixed on the coating and located within the area of ​​the coating. The height of the fixed waveband is less than the height of the free wave.

[0017] In one embodiment of the present invention, the fixed wave loop includes a first fixed wave, and the free wave is wrapped around the trough of the first fixed wave and extends towards the near end so that the height of the free wave is higher than the height of the fixed wave loop.

[0018] In one embodiment of the present invention, 2-4 free waves are arranged symmetrically along the circumferential center.

[0019] In one embodiment of the present invention, the cross-sectional diameter of the free wave is smaller than the cross-sectional diameter of the fixed wave.

[0020] The lumen stent provided by the present invention has a bare stent wave ring including free waves, and each free wave is not fixed to the diaphragm. This allows the free waves to flip relative to the diaphragm of the main body of the lumen stent to the side away from the diaphragm. When the free waves are hooked by the hook of the post-release structure for post-release, they will not pull on the diaphragm and cause a narrowing phenomenon at the proximal end of the diaphragm. This avoids the problem that the small proximal opening makes it difficult for instruments for reconstruction branches to pass through. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a thoracic and abdominal aortic stent implanted at the site of a thoracic and abdominal aortic aneurysm using existing technology.

[0022] Figure 2 This is a schematic diagram of a thoracic and abdominal main cavity stent implanted as a bridging stent at the site of a thoracic and abdominal aortic aneurysm, using existing technology.

[0023] Figure 3 This is a three-dimensional schematic diagram of the bare stent corrugation of the lumen stent provided in Embodiment 1 of the present invention;

[0024] Figure 4 This is a three-dimensional schematic diagram of the lumen support provided in Embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the luminal stent provided in Embodiment 1 of the present invention being implanted at the site of a thoracic and abdominal aortic aneurysm;

[0026] Figure 6 This is a schematic diagram of the bare stent corrugation of the lumen stent provided in Embodiment 2 of the present invention;

[0027] Figure 7 This is a schematic diagram of the bare stent corrugation of the lumen stent provided in Embodiment 3 of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0030] It should also be noted that the directional terms such as left, right, up, and down used in this embodiment are only relative concepts or references to the normal use of the product, and should not be considered restrictive. Furthermore, in describing blood vessels, orientation can be defined according to the direction of blood flow; in this invention, blood flow is defined as flowing from the proximal end to the distal end.

[0031] Example 1

[0032] like Figures 3 to 5 The diagram shown is a schematic representation of the various components of the lumen support provided in Embodiment 1 of the present invention. See also... Figure 3 and Figure 4 The stent 100 includes a main body 1 and bare stent corrugations 2 connected to the main body 1. The main body 1 includes a main stent 11 and a membrane 12 covering the main stent 11. The main stent 11 includes multiple metal corrugations 111 spaced apart along the axial direction, wherein the metal corrugation closest to the bare stent corrugation is the first corrugation 1111. The main stent 11 is usually made of metal materials such as nickel-titanium alloy or stainless steel. In actual fabrication, the main stent 11 can be formed by weaving nickel-titanium wire or cutting and shaping nickel-titanium tubes. The membrane 12 is made of a polymer material with good biocompatibility, such as e-PTFE (expanded polytetrafluoroethylene) or PET (polyethylene terephthalate). The membrane 12 covering the main stent 11 can be fixed to the membrane 12 by sewing or high temperature and pressure. The membrane 12 is usually tubular. Figure 3 , Figure 4 As shown, the bare stent wavelet 2 is located near the proximal end of the main body 1 and inside the membrane 12. The bare stent wavelet 2 includes a free wave 21a and multiple fixed waves 22a connected to the free wave 21a. The cross-sectional diameter of the free wave is smaller than that of the fixed waves, making the free wave more flexible and easier to hook onto the post-release structure. This reduces the pulling effect of the free wave on the proximal membrane. The fixed waves are stiffer than the free wave; when the free wave is hooked onto the post-release structure, the fixed waves will not move inward with the free wave, providing better support and preventing shrinkage of the membrane on the fixed waves. The bare stent wavelet 2 includes at least one free wave 21a, such as... Figure 3 , Figure 4As shown, in this embodiment, three free waves 21a are symmetrically arranged around the proximal end of the main body 1, and the free waves 21a are not fixed to the covering film 12. The bare support wave ring 2 is fixed to the main body 1 by a fixed wave 22a. The fixed wave 22a is fixed to the proximal end of the covering film 12 and is located within the area of ​​the covering film 12. The height of the free waves 21a is higher than the height of the fixed waves 22a, so that the free waves 21a protrude from the proximal end face of the covering film 12. The free waves 21a are spaced apart, and each free wave 21a can be flipped relative to the covering film 12 to the side away from the covering film 12. In its natural state without external force, the distal end of the bare stent wave loop 2 at least partially overlaps with the proximal end of the cover 12, and the proximal end of the free wave 21a protrudes beyond the proximal end face of the cover 12. That is, the fixed wave 22a can be completely fixed on the cover 12, providing support for the proximal end of the cover 12. The free wave 21a is only connected to the fixed wave 22a and is not directly fixed to the cover 12; it is indirectly fixed to the cover 12 through the fixed wave 22a. By partially overlapping the distal end of the bare stent wave loop 2 with the proximal end of the cover 12 and making the proximal end of the free wave 21a protrude beyond the proximal end face of the cover 12, it can prevent the bare stent wave loop 2 from exceeding the cover 12 by too much height, which would cause excessive stimulation to the blood vessel. On the other hand, it can ensure that the free wave 21a has an appropriate length when connected to the hook 51 of the post-release structure, preventing the length from being too short and causing the proximal end of the main stent 11 to contract inward, thereby affecting the passage and operation of the reconstruction branch device.

[0033] Figure 4-5 In the illustrated embodiment, since the bare stent waveband 2 includes only three free waves 21a, and the free waves are not fixed to the covering membrane, compared to existing luminal stents, its design prevents the anchoring waves (in this invention, free waves anchored to the post-release structure) from being hooked onto the post-release structure and converging towards the lumen with the covering membrane, thus avoiding severe narrowing of the proximal end of the luminal stent. Simultaneously, it reduces the number of anchoring waves and the division of the proximal port area of ​​the luminal stent by the anchoring waves, thereby relatively reducing the cutting area at the proximal port of the main stent 11. This facilitates the introduction of instruments for reconstruction branches, allowing the instruments for reconstruction branches to have a relatively larger entry point into the lumen of the luminal stent 100, improving the operability and convenience of the surgery. Furthermore, it ensures that the anchoring waves do not extend excessively beyond the proximal end face of the covering membrane to meet the required anchoring height for hooking onto the post-release structure.

[0034] The luminal stent 100 also includes a sub-stent 3, which includes an inner branch 31 and an outer branch 32. The inner branch 31 is located on the inner side of the main body 1, and the outer branch 32 is located on the outer side of the main body 1. The inner branch 31 and the outer branch 32 are used to connect with an external bridging stent, thereby restoring blood supply to the visceral arteries. Of course, in other embodiments, the sub-stent 3 may only include an inner branch, or only include an outer branch, or may not have any sub-stents. Various types can be provided and selected according to the actual situation.

[0035] Of course, two free waves 21a can also be set symmetrically. When only two free waves 21a are set and they are set symmetrically, they can not only make the lumen stent 100 stable, but also minimize the number of regions divided at the proximal end of the lumen stent, making the divided region larger, thereby providing a relatively large entrance for the passage of instruments for reconstructing branches, so as to reduce interference and improve the operability and safety of the operation.

[0036] In this embodiment, the free wave 21a is not directly fixed to the membrane 12. The free wave 21a can flip relative to the membrane 12 to the side away from the membrane 12, that is, flip towards the center of the lumen stent 100. It can be connected to the hook 51 of the rear release structure in the release state. Since the free wave 21a can flip relative to the side away from the membrane 12, the proximal end of the membrane 12 does not flip with the free wave 21a. Therefore, when the hook 51 of the rear release structure hooks the free wave 21a to fix the lumen stent 100, the proximal end of the membrane 12 will not be pulled inward by the free wave 21a. This can prevent the proximal end of the lumen stent 100 from leaking due to the narrowing of the membrane 12, and can also avoid the narrowing of the membrane 12 from hindering the operation of the reconstruction branch instrument.

[0037] See also Figure 3 , Figure 4 , Figure 5Between two adjacent free waves 21a, one fixed wave 22a can be set, or two or more fixed waves 22a can be set. The specific number of free waves 21a and fixed waves 22a can be set according to the size of the lumen to be implanted. The free wave 21a includes a first wave rod 211a and a second wave rod 212a. The first wave rod 211a and the second wave rod 212a are connected end to end to form an inverted V-shape. The transition connection between the first wave rod 211a and the second wave rod 212a forms the crest of the free wave 21a. The free ends of the first wave rod 211a and the second wave rod 212a (i.e., the two ends of the V-shaped opening) are connected to the fixed wave 22a. Similarly, the fixed wave 22a can also adopt a structure of two metal rods connected to form an inverted V-shape. The height of the fixed wave 22a is less than the height of the free wave 21a. The fixed wave 22a and the free wave 21a are connected and form a ring. At this time, the trough where the free wave connects with the fixed wave is the fulcrum for the free wave to flip inward when hooked. Compared with the bare stent wave loop that is almost completely exposed at the proximal end of the endostem, this greatly reduces the flipping fulcrum of the free wave, so that the free wave will not protrude excessively from the proximal end of the endostem when it meets the hooking height, thus reducing stimulation to the blood vessel. The fixed wave 22a is fixed to the endostem 12, while the free wave 21a is not directly connected to the endostem 12 and is in a free state. The bare stent waveband 2 is fixed to the diaphragm 12 by a fixed wave 22a, so that the free wave 21a is indirectly connected to the main body 1. When the free wave 21a flips inward relative to the diaphragm 12 of the main body 1, it has a corresponding flipping fulcrum. Since the diaphragm 12 is fixed to the fixed wave 22a but not to the free wave, it does not flip with the flipping of the free wave 21a under the support of the fixed wave 22a. This avoids the narrowing phenomenon at the proximal end of the lumen stent 100 or reduces the number of areas divided at the proximal end of the lumen stent, making it easier for instruments for reconstructing branches to pass through. The free wave 21a and the fixed wave 22a can be integrally woven or integrally cut. Of course, the free wave 21a and the fixed wave 22a can also be made into separate parts and then fixedly connected into one piece by welding or cylinder liner pressing.

[0038] In this embodiment, the proximal end of the fixed wave 22a is flush with or nearly flush with the proximal end face of the covering 12. This provides support to the proximal end of the covering 12, allowing it to remain open and preventing internal leakage. Furthermore, the fixed wave 22a acts as a bridge between the free wave 21a and the main body 1. Since part of the free wave 21a overlaps with the proximal end of the covering 12, and another part protrudes from the proximal end face of the covering 12, its height does not need to be high to meet the requirements for fixed connection with the hook 51 of the post-release structure. Moreover, due to the small number of free waves 21a and their reasonable height design, the proximal end of the covering 12 will not constrict, nor will it cause excessive stimulation to blood vessels. This greatly improves the convenience and safety of the surgical procedure, while reducing the adverse damage and stimulation caused by the surgery, significantly alleviating postoperative discomfort for the patient.

[0039] Furthermore, such as Figure 4 As shown, the first wave loop 1111 also includes a support wave peak 1111a corresponding to the free wave. The support wave peak 1111a is close to the proximal end of the cover. The support wave peak 1111a is used to replace the free wave 21a to provide support for the cover in the same area. When the free wave 21a is hooked on the post-release structure and flips relative to the cover to the side away from the cover, it can prevent the cover from wrinkling and collapsing, thereby causing the proximal end of the stent to shrink. On the other hand, it can also provide support for the cover when the stent is fully released, so that the proximal end of the stent fits the vessel wall better and prevents endoleak at the proximal end of the cover.

[0040] Example 2

[0041] like Figure 6 The diagram shown is a schematic representation of the bare stent corrugation 2 of the lumen stent provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 lies in the specific structure of the bare stent corrugation 2. The other structural components of the lumen stent can be referred to in the above embodiments and will not be repeated here.

[0042] The bare support wave ring 2 includes a fixed wave ring 23b and multiple free waves 21b connected to the fixed wave ring 23b. The free waves 21b can be arranged at intervals around the fixed wave ring 23b. The free wave 21b includes a first wave rod 211b and a second wave rod 212b. The first wave rod 211b and the second wave rod 212b are connected end to end to form an inverted V-shape. The transition connection between the first wave rod 211b and the second wave rod 212b forms the wave crest 213b of the free wave 21b. The free ends of the first wave rod 211b and the second wave rod 212b (i.e., the two ends of the V-shaped opening) are directly fixed to the fixed wave coil 23b. The fixed wave coil 23b is fixed to the proximal end of the membrane of the lumen support. In this way, when the free wave 21b flips inward relative to the membrane, since only the free ends of the first wave rod 211b and the second wave rod 212b are fixed to the fixed wave coil 23b, and the other parts are not directly fixed to the membrane, the proximal end of the membrane will not flip with the flipping of the free wave 21b. This prevents the membrane from flipping with the free wave 21b and causing the proximal membrane of the lumen support 100 to shrink. Setting multiple free wave intervals can prevent the near-port area of ​​the membrane from being divided into too many areas, which would make it difficult for the reconstruction branch instruments to enter due to the small opening, and would seriously interfere with the operation of the reconstruction branch instruments.

[0043] The first wave rod 211b and the second wave rod 212b can be integrally formed or separate structures. The free ends of the first wave rod 211b and the second wave rod 212b can be connected to the fixed wave coil 23b by welding, pressing or through an intermediate connector. Of course, they can also be integrally cut or woven together with the fixed wave coil 23b.

[0044] The fixed wave coil 23b has a ring structure and includes multiple alternating peaks 231b and troughs 232b. The height of the peaks 231b of the fixed wave coil 23b is less than the height of the peaks 213b of the free wave 21b. The fixed wave coil 23b is fixed to the diaphragm of the main body of the lumen stent and serves to support the diaphragm. The peaks 213b of the free wave 21b can be positioned opposite to the peaks 231b of the fixed wave coil 23b. To prevent the proximal end of the lumen stent from being divided into too many areas by the free waves 21b, which would affect the passage of instruments for reconstruction branches, the number of free waves 21b should not be too large, generally around 2-4 is appropriate, and they should be symmetrically arranged along the circumferential center. This can prevent diaphragm narrowing while reducing the number of areas divided at the proximal end of the diaphragm.

[0045] The peaks 231b of the fixed wave loop 23b have the same height. The fixed wave loop 23b can be a symmetrical structure. The free wave 21b is connected to the fixed wave loop 23b at a position close to the trough of the fixed wave loop 23b. This can prevent the height of the free wave 21b from protruding too much from the proximal end face of the membrane 12, thereby avoiding excessive stimulation of the blood vessels.

[0046] In other embodiments, the free wave 21b can also be connected to the trough 232b of the fixed wave loop 23b, which can make the free wave 21b meet the height requirements of hooking onto the rear release structure while not protruding too much from the proximal end face of the membrane 12, thereby preventing excessive stimulation of blood vessels.

[0047] Example 3

[0048] like Figure 7 The diagram shown is a schematic representation of the bare stent corrugation 2 of the lumen stent provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the specific structure of the bare stent corrugation 2 of the lumen stent is different. The structure of other parts of the lumen stent can be referred to the above embodiments and will not be repeated here.

[0049] The bare stent corrugated coil 2 includes a fixed corrugated coil 23c and multiple free waves 21c connected to the fixed corrugated coil 23c, with each free wave 21c spaced apart. Each free wave 21c includes a first wave rod 211c and a second wave rod 212c. The first wave rod 211c and the second wave rod 212c bend at their connection point, forming an inverted V-shape. The transition point between the first wave rod 211c and the second wave rod 212c forms the crest of the free wave 21c. The free ends of the first wave rod 211c and the second wave rod 212c (i.e., the two ends of the V-shaped opening) are fixed to the fixed corrugated coil 23c, which is fixed to the membrane covering the main body of the stent. In this configuration, the free wave 21c is fixed relative to the covering membrane via the fixed wave coil 23c. Thus, the free wave 21c is not fixed to the covering membrane and can be flipped relative to it. When the free wave 21c flips, the proximal end of the covering membrane is supported by the fixed wave coil 23c, preventing it from flipping along with the free wave 21c and thus avoiding narrowing at the proximal end of the covering membrane. Furthermore, since the free waves 21c are spaced apart and relatively few in number, the proximal end of the stent is prevented from being cut into multiple regions, which could affect the entry of instruments for reconstruction branches. At least one free wave 21c is required; that is, the bare stent wave coil 2 includes one or more free waves 21c. The specific number can be designed according to the required diameter of the implanted lumen. When the bare stent wave coil 2 includes two symmetrically arranged free waves, the stent remains relatively stable in the body after being anchored to the hook of the post-release structure, making it less prone to displacement and providing better fixation. This also better prevents narrowing or small segmentation issues. When the bare stent waveband 2 includes multiple free waves 21c, each free wave 21c is spaced apart and symmetrically arranged along the center. This allows the hook of the post-release structure to more stably position the lumen stent, while preventing the division of the area from being too large, thus avoiding the small range of each area and affecting the passage of the reconstruction branch instruments.

[0050] The fixed wave coil 23c is a ring-shaped mesh structure formed by braiding filaments, or it can be integrally cut to form a ring-shaped mesh structure. For details, please refer to [reference needed]. Figure 7 The structure shown is formed by connecting multiple diamond-shaped braided components. Each diamond can be viewed as two corrugated coils with their crests overlapping, providing better support for the membrane near the proximal end of the lumen support, resulting in better sealing performance. This also better prevents internal leakage after complete release, and when the free wave is hooked onto the post-release structure, it prevents wrinkles in the proximal membrane and further reduces constriction. The free wave 21c and the fixed corrugated coil 23c can be integrally woven from braided yarn, or they can be integrally cut. Alternatively, the free wave 21c and the fixed corrugated coil 23c can be made into separate structures and then fixedly connected by welding, pressing, or other methods.

[0051] like Figure 7 As shown, the free wave 21c and the fixed wave loop 23c are integrally woven from braided yarn. The braiding direction between the fixed wave loop 23c and the free wave 21c can be changed at the intersection point shown in the figure, thereby achieving integral weaving. The fixed wave loop 23c also includes a first fixed wave 231c, which forms a half of a rhombus. The free wave 21c can be formed by the braided yarn wrapping around part or all of the wave rod of the first fixed wave 231c, extending towards the near end to form a wave crest higher than that of the fixed wave loop 23c (i.e., the wave crest of the free wave 21c). At this time, the free waves 21c are spaced apart and span at least two wave crests of the fixed wave loop 23c. Figure 7 (Three peaks spanning the fixed wave loop). When the free wave 21c is hooked onto the post-release structure, because the free waves 21c are spaced apart, the membrane supported by the fixed wave between two adjacent free waves will not be carried inward by the free waves, which can reduce the degree of constriction at the proximal end of the lumen stent.

[0052] Of course, in other embodiments, the free wave 21c and the fixed wave coil 23c are woven together with braided yarn. The free wave 21c can be wound only at the trough of the first fixed wave 231c and then extended towards the proximal end to form a higher peak than the fixed wave coil 23c (i.e., the peak of the free wave 21c). While maintaining the support and sealing performance of the membrane at the proximal end of the lumen stent, when the free wave 21c is hooked on the rear release structure, since the free wave is only wound at the trough of the first fixed wave 231c, the fulcrum when the free wave flips relative to the fixed wave coil can be reduced to the greatest extent. The membrane at the proximal end of the lumen stent will not be carried towards the lumen by the free wave and can avoid the narrowing phenomenon at the proximal end of the lumen stent. The spaced free waves can also reduce the area division of the membrane near the port, which facilitates the passage and operation of the reconstruction branch instrument.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lumen stent, characterized by, The application relates to a stent, which comprises: a main body, which comprises a main stent and a covering film covering the main stent; a bare stent wave ring, which is fixed on the main body, is located at the proximal end of the main body and is located on the inner side of the covering film, comprises free waves which are not fixed to the covering film, and further comprises a plurality of fixed waves which are connected to the free waves, are fixed to the proximal end of the covering film and are located in the area of the covering film, and have a height lower than that of the free waves, so that the free waves protrude from the proximal end surface of the covering film and can be turned to the side away from the covering film.

2. The intraluminal stent of claim 1, wherein, The free waves are arranged in at least two and are arranged in a circumferential central symmetry along the proximal end of the main body; the fixed waves and the free waves are connected in sequence and enclose a ring shape.

3. The intraluminal stent of claim 1, wherein, The main stent comprises a plurality of metal wave rings arranged in an axial direction, a metal wave ring close to the bare stent wave ring is a first wave ring, and the first wave ring comprises support wave peaks arranged correspondingly to the free waves.

4. The intraluminal stent of claim 1, wherein, The bare stent wave ring further comprises a fixed wave ring, the free waves are connected to the fixed wave ring, the fixed wave ring comprises a plurality of wave peaks and wave troughs arranged alternately, the height of the wave peaks of the fixed wave ring is lower than that of the wave peaks of the free waves, and the fixed wave ring is fixed to the covering film and is located in the area of the covering film.

5. The intraluminal stent of claim 4, wherein, The heights of the wave peaks of the fixed wave ring are the same, and the position where the free waves are connected to the fixed wave ring is close to the wave troughs of the fixed wave ring. Alternatively, The free waves are connected to the wave troughs of the fixed wave ring.

6. The intraluminal stent of claim 1, wherein, The bare stent wave ring further comprises a fixed wave ring, the fixed wave ring is a ring-shaped net tube structure, the free waves are fixed to the fixed wave ring, the fixed wave ring is fixed to the covering film and is located in the area of the covering film, and the height of the fixed wave ring is lower than that of the free waves.

7. The intraluminal stent of claim 6, wherein, The fixed wave ring comprises a first fixed wave, the free waves are wound at the wave troughs of the first fixed wave and extend towards the proximal end so that the height of the free waves is higher than that of the fixed wave ring.

8. The intraluminal stent of claim 1, wherein, The free waves are arranged in 2-4 in a circumferential central symmetry.

9. The intraluminal stent of claim 1, wherein, The cross-sectional diameter of the free waves is smaller than that of the fixed waves.

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