Main covered stent and covered stent system

Abstract

The invention relates to a main covered stent and a covered stent system.The main covered stent comprises a near-end fixing part, a far-near communicating section, a branch reconstruction section and a far-end fixing part, the two ends of the far-near communicating section communicate with the near-end fixing part and the far-end fixing part correspondingly, and the two ends of the branch reconstruction section communicate with the near-end fixing part and the far-end fixing part correspondingly; connecting holes are formed in the branch reconstruction section and extend in the radial direction of the branch reconstruction section. According to the technical scheme, the technical problems that the anchoring direction of a traditional covered stent is single, the implanting requirement for the covered stent and a branch vascular stent is high, and the surgical risk is large are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to a main covered stent and a covered stent system. Background Art

[0002] Aortic aneurysm and aortic dissection are extremely dangerous human vascular diseases. Among them, aortic aneurysm refers to the diffuse abnormal dilation of blood vessels, which compresses the surrounding organs and causes symptoms, with the main risk being the rupture of the aneurysm; aortic dissection refers to the tearing of the intima of blood vessels and the expansion of the rupture opening, forming true and false blood cavities. In addition to the risk of blood cavity rupture, it also seriously affects the blood supply of branch vessels or organs. Aortic aneurysm mainly occurs in the abdominal aorta, thoracic aorta, and aortic arch, while aortic dissection mainly occurs in the thoracic aorta. Both of these diseases may involve branch arteries.

[0003] Currently, endovascular treatment techniques (i.e., minimally invasive therapies) have been carried out at home and abroad. By means of the blood vessel lumen, a graft (such as an arterial covered stent) is implanted into the diseased artery to treat arterial diseases and improve blood supply. The above-mentioned arterial covered stent in the blood vessel lumen includes a rigid wire tubular stent and a film covering fixed on the outside of the rigid wire. The rigid wire tubular stent is formed by surrounding an elastic rigid wire into a ring after Z-shaped folding, and then multiple rings are sewn or glued together with the film to form a tubular covered stent. When in use, the tubular covered stent is axially compressed and loaded into a delivery device, and the delivery device sends it to the diseased artery through a smaller femoral artery, iliac artery, or brachial artery and then releases it. The tubular covered stent automatically returns to a straight tubular shape under the elastic force of the wire stent and closely adheres to the inner wall of the aorta, isolating the arterial diseased area from the blood flow, thereby achieving the treatment purpose. In minimally invasive treatment, there is a long safety length requirement for the healthy aortic anchoring area of the covered stent. However, when the arterial diseased area involves the bifurcated blood vessel or its vicinity, in order not to block / interfere with the normal blood perfusion of the branch artery, the length of the healthy aortic anchoring area provided for the covered stent is limited.

[0004] In related technologies, generally, sparse stent bare areas are designed at the proximal or distal end of the covered stent to ensure the normal blood perfusion of the bifurcated blood vessel through the non-tight and discontinuous characteristics of the stent bare area, and at the same time increase the anchoring area of the covered stent. During the implantation process of the branch blood vessel stent, it is necessary to first ensure that the suspended end of the branch bare area is aligned with the bifurcated blood vessel, and then the branch blood vessel stent is axially extended from the suspended end so that it is built on the bifurcated blood vessel and the covered stent. This makes the anchoring direction provided by the branch bare area for the branch blood vessel stent single, and the branch blood vessel stent can only be axially extended from its suspended end to complete the construction, greatly increasing the implantation difficulty and surgical risk of the covered stent and the branch blood vessel stent. Summary of the Invention

[0005] The present application provides a main covered stent and a covered stent system to solve the technical problems of the traditional covered stent with a single anchoring direction, high requirements for the implantation of the covered stent and the branch vascular stent, and high surgical risks.

[0006] To this end, in a first aspect, an embodiment of the present application provides a main covered stent, including a proximal fixing part, a proximal-distal communicating section, a branch reconstruction section, and a distal fixing part. The two ends of the proximal-distal communicating section are respectively communicated with the proximal fixing part and the distal fixing part, and the two ends of the branch reconstruction section are respectively communicated with the proximal fixing part and the distal fixing part. A connection hole is arranged on the branch reconstruction section, and the connection hole extends along the radial direction of the branch reconstruction section.

[0007] In a possible implementation manner, the center line of the branch reconstruction section is parallel to the center line of the main covered stent.

[0008] In a possible implementation manner, the branch reconstruction section includes an extension part, and the extension part is located on the periphery of the connection hole.

[0009] In a possible implementation manner, the branch reconstruction section includes a first branch section, a connection part, and a second branch section arranged in sequence. One end of the first branch section away from the connection part is communicated with the proximal fixing part, one end of the second branch section away from the connection part is communicated with the distal fixing part, and the connection hole is correspondingly arranged at the connection part.

[0010] In a possible implementation manner, the connection part includes a plurality of connection wires, and the plurality of connection wires are circumferentially spaced around the first branch section between the first branch section and the second branch section, and the connection wires extend along the axial direction of the first branch section.

[0011] In a possible implementation manner, the connection part includes a first support framework, and the first support framework is an open waveform structure, and the connection hole is located on the open side of the first support framework.

[0012] In a possible implementation manner, one side of the first support framework away from the connection hole is connected to the proximal-distal communicating section.

[0013] In a possible implementation manner, the connection part includes a second support framework, and the second support framework is a ring structure.

[0014] In a possible implementation manner, the included angle between the radial extension line of the second support framework and the axial extension line of the branch reconstruction section is 0° to 90°.

[0015] In a possible implementation manner, the main covered stent further includes a third support frame, and the third support frame is arranged on the covering film of the branch reconstruction section and / or the third support frame is arranged on the covering film of the proximal-distal communicating section.

[0016] In a possible implementation, the main covered stent further includes a fourth support frame, and the fourth support frame is sleeved outside the branch reconstruction section and the proximal-distal communication section.

[0017] In a possible implementation, at least a part of the branch reconstruction section is arranged outside the proximal-distal communication section.

[0018] In a possible implementation, an avoidance hole is provided on the proximal-distal communication section. The branch reconstruction section includes a connected exposed section and an embedded section. The connection hole is arranged on the embedded section. The avoidance hole at least avoids the connection hole, and the branch reconstruction section is connected to the proximal-distal communication section at least at the periphery of the connection hole.

[0019] In a possible implementation, the branch reconstruction section includes a connected exposed section and an embedded section, and the connection hole is arranged on the exposed section.

[0020] In a possible implementation, an avoidance hole is provided on the proximal-distal communication section. The branch reconstruction section is embedded in the proximal-distal communication section. The avoidance hole at least avoids the connection hole, and the branch reconstruction section is connected to the proximal-distal communication section at least at the periphery of the connection hole.

[0021] In a possible implementation, there are multiple branch reconstruction sections, and the multiple branch reconstruction sections are distributed at intervals along the periphery of the proximal fixing part between the proximal fixing part and the distal fixing part.

[0022] In a second aspect, the embodiment of the present application further provides a covered stent system, including a branch stent, a delivery device, and the main covered stent as described above. The delivery device is used to deliver the branch stent and release the branch stent at the connection hole of the main covered stent, so that the branch stent communicates with the branch reconstruction section of the main covered stent and the corresponding branch artery.

[0023] According to the main covered stent and covered stent system provided by the embodiments of the present application, the main covered stent includes a proximal fixing portion, a proximal-distal communication section, a branch reconstruction section, and a distal fixing portion. The two ends of the proximal-distal communication section are respectively communicated with the proximal fixing portion and the distal fixing portion, and the two ends of the branch reconstruction section are respectively communicated with the proximal fixing portion and the distal fixing portion. Connecting holes are arranged on the branch reconstruction section, and the connecting holes extend along the radial direction of the branch reconstruction section. In the technical solution of the present application, by optimizing the specific structure of the main covered stent, while ensuring the anchoring of the covered stent, the normal blood perfusion of the bifurcated artery is taken into account; and due to the high flexibility of the direction of the connecting holes arranged on the branch reconstruction section, the requirements for the construction of the main covered stent during the operation are reduced, so that the main covered stent can adapt to more complex vascular bifurcation situations, such as the vascular bifurcation drainage at the lesion sites such as bifurcated vascular aortic aneurysm or aortic dissection, aortic arch diseases, abdominal aortic diseases, etc., and the operation difficulty of minimally invasive surgery is reduced. Specifically, the main covered stent is configured as a combined component at least including a proximal fixing portion, a proximal-distal communication section, a branch reconstruction section, and a distal fixing portion. Both the proximal fixing portion and the distal fixing portion are used to be built on the healthy aorta to enhance the connection stability of the main covered stent and the stability of the overall working environment; the proximal-distal communication section is configured between the proximal fixing portion and the distal fixing portion to realize the drainage of the main blood vessel of the bifurcated blood vessel through the proximal-distal communication section; the branch reconstruction section is configured between the proximal fixing portion and the distal fixing portion to realize the construction of the anchoring site of the branch blood vessel in the bifurcated blood vessel by adding the branch reconstruction section; and, connecting holes are configured on the branch reconstruction section, and the connecting holes can be used for subsequent implantation of branch stents to realize the construction of the branch blood vessel in the bifurcated blood vessel; at the same time, a certain distance is spaced between the connecting holes and both the proximal fixing portion and the distal fixing portion, and the distance is not less than 1 cm to ensure the anchoring stability of the branch stent. In this way, by setting a bifurcated structure on the main covered stent, the problems of difficult construction and low construction accuracy of the bifurcated blood vessels at special lesion sites such as bifurcated blood vessels and aortic arch are solved, and the operation difficulty of minimally invasive surgery is reduced; at the same time, the branch reconstruction section is configured between the proximal fixing portion and the distal fixing portion to improve the position stability and connection stability of the branch reconstruction section through the proximal fixing portion and the distal fixing portion built on the healthy aorta, and then provide a stable anchoring area for the working environment of the branch stent, thereby improving the anchoring stability of the branch stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention. To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required for use in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings. One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the accompanying drawings are represented as similar elements. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a scale limitation.

[0025] Figure 1 The front view of the main covered stent ① provided in the first embodiment of the present application;

[0026] Figure 2 The side view of the main covered stent ① provided in the first embodiment of the present application;

[0027] Figure 3 The top view of the main covered stent ① provided in the first embodiment of the present application;

[0028] Figure 4 For Figure 3 The sectional view in the D-D direction in

[0029] Figure 5 The side view of the main covered stent ② provided in the first embodiment of the present application;

[0030] Figure 6 The front view of the main covered stent ③ provided in the first embodiment of the present application;

[0031] Figure 7 The front view of the main covered stent ④ provided in the first embodiment of the present application;

[0032] Figure 8 The front view of the main covered stent ⑤ provided in the first embodiment of the present application;

[0033] Figure 9 The front view of the main covered stent ⑥ provided in the first embodiment of the present application;

[0034] Figure 10 The front view of the main covered stent ⑦ provided in the first embodiment of the present application;

[0035] Figure 11 The front view of the main covered stent ⑧ provided in the first embodiment of the present application;

[0036] Figure 12 For Figure 10 The radial sectional view of

[0037] Figures 13 to 18 Operation diagrams of the vascular stent-graft system provided by the first embodiment of the present application in different states; wherein, Figure 16 is Figure 15 an enlarged view of part A in

[0038] Figure 19 The front view of the main stent-graft provided by the second embodiment of the present application;

[0039] Figure 20 The front view of another main stent-graft provided by the second embodiment of the present application;

[0040] Figure 21 is Figure 20 the radial sectional view of part B in

[0041] Figure 22 is Figure 20 an enlarged view of part B in

[0042] Figure 23 The front view of the main stent-graft provided by the third embodiment of the present application;

[0043] Figure 24 is Figure 23 an enlarged view of part C in

[0044] Figure 25 is Figure 23 the radial sectional view of part C in

[0045] Figure 26 The front view of the main stent-graft provided by the fourth embodiment of the present application;

[0046] Figure 27 The top view of the far and near connection section provided by the fourth embodiment of the present application;

[0047] Figure 28 The front view of the main stent-graft provided by the fifth embodiment of the present application;

[0048] Figure 29 The side view of the main stent-graft provided by the fifth embodiment of the present application;

[0049] Figure 30 The front view of the main stent-graft provided by the sixth embodiment of the present application;

[0050] Figure 31 The side view of the main stent-graft provided by the sixth embodiment of the present application;

[0051] Figure 32 The front view of the main stent-graft provided by the seventh embodiment of the present application;

[0052] Figure 33 Side view of the main covered stent provided by the seventh embodiment of the present application;

[0053] Figure 34 Top view of the far and near connection section provided by the seventh embodiment of the present application;

[0054] Figure 35 Schematic three-dimensional structure diagram of the main covered stent provided by the eighth embodiment of the present application;

[0055] Figure 36 Front view of the main covered stent provided by the eighth embodiment of the present application;

[0056] Figure 37 Front view of another main covered stent provided by the eighth embodiment of the present application;

[0057] Figures 38 to 41 Operation diagrams of the covered stent system for building blood vessels in different states provided by the eighth embodiment of the present application.

[0058] Explanation of reference numerals:

[0059] 100, proximal fixing part; 110, proximal covering film; 120, proximal support framework;

[0060] 200, far and near connection section; 201, avoidance hole;

[0061] 300, branch reconstruction section; 301, connection hole; 310, first branch section; 320, connection part; 321, connection silk thread; 322, first support framework; 323, second support framework; 330, second branch section;

[0062] 400, distal fixing part; 410, distal covering film; 420, distal support framework;

[0063] 500, third support frame; 600, fourth support frame;

[0064] 10, branch stent; 20, delivery device; 30, main covered stent; 40, angiography catheter. Detailed implementation manners

[0065] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0066] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can recognize the applicability of other processes and / or the use of other materials.

[0067] For ease of description, spatially relative terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms such as "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", "front", "rear", etc. This spatially relative relationship term is intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or attitude change or motion state change, then these directional indications will change accordingly. For example, an element described as "below other elements or features" or "beneath other elements or features" will subsequently be oriented as "above other elements or features" or "over other elements or features". Therefore, the exemplary term "below" can include the orientations of above and below. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatially relative descriptors used in the text are interpreted accordingly.

[0068] First Embodiment

[0069] Figure 1 The front view of the main covered stent 30① provided by the first embodiment of the present application is shown; Figure 2 The side view of the main covered stent 30① provided by the first embodiment of the present application is shown; Figure 3 The top view of the main covered stent 30① provided by the first embodiment of the present application is shown; Figure 4 Shown Figure 3 The cross-sectional view in the D-D direction; Figure 5 The side view of the main covered stent 30② provided by the first embodiment of the present application is shown; Figure 6 The front view of the main covered stent 30③ provided by the first embodiment of the present application is shown; Figure 7 The front view of the main covered stent 30④ provided by the first embodiment of the present application is shown; Figure 8 The front view of the main covered stent 30⑤ provided by the first embodiment of the present application is shown; Figure 9The front view of the main covered stent 30⑥ provided by the first embodiment of the present application is shown; Figure 10 The front view of the main covered stent 30⑦ provided by the first embodiment of the present application is shown; Figure 11 The front view of the main covered stent 30⑧ provided by the first embodiment of the present application is shown; Figure 12 Shown Figure 10 The radial cross-sectional view of; Figures 13 to 18 The operation diagrams of the covered stent system provided by the first embodiment of the present application for building blood vessels in different states are shown; wherein, Figure 16 Shown Figure 15 The enlarged view of part A in;

[0070] Refer to Figures 1 to 4 As shown in, the embodiment of the present application provides a main covered stent, which includes a proximal fixing part 100, a proximal and distal connecting section 200, a branch reconstruction section 300 and a distal fixing part 400. The two ends of the proximal and distal connecting section 200 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. The two ends of the branch reconstruction section 300 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. Connecting holes 301 are arranged on the branch reconstruction section 300, and the connecting holes 301 extend along the radial direction of the branch reconstruction section 300.

[0071] In this embodiment, by optimizing the specific structure of the main covered stent 30, while ensuring the anchoring of the covered stent, the normal blood perfusion of the bifurcated artery is taken into account; and due to the high flexibility of the direction of the connecting holes 301 arranged on the branch reconstruction section 300, the requirements for building the main covered stent 30 during the operation are reduced, so that the main covered stent 30 can adapt to more complex vascular bifurcation situations, such as vascular bifurcation drainage at the lesion sites such as bifurcated vascular aortic aneurysms or aortic dissections, aortic diseases in the aortic arch, abdominal aortic diseases, etc., and the operation difficulty of minimally invasive surgery is reduced.

[0072] Specifically, the main covered stent 30 is configured to include at least a combination component of a proximal fixing portion 100, a proximal-distal communication section 200, a branch reconstruction section 300, and a distal fixing portion 400. Both the proximal fixing portion 100 and the distal fixing portion 400 are used to be built on the healthy aorta to enhance the connection stability of the main covered stent 30 and the stability of the overall working environment. The proximal-distal communication section 200 is arranged between the proximal fixing portion 100 and the distal fixing portion 400 to achieve the drainage of the main blood vessel of the bifurcated blood vessel through the proximal-distal communication section 200. The branch reconstruction section 300 is arranged between the proximal fixing portion 100 and the distal fixing portion 400 to achieve the construction of the anchoring site of the branch blood vessel in the bifurcated blood vessel by adding the branch reconstruction section 300. And, a connection hole 301 is arranged on the branch reconstruction section 300, and the connection hole 301 can be used for the subsequent implantation of the branch stent 10 to achieve the construction of the branch blood vessel in the bifurcated blood vessel. At the same time, the connection hole 301 is spaced a certain distance from both the proximal fixing portion 100 and the distal fixing portion 400, and this distance is not less than 1 cm to ensure the anchoring stability of the branch stent 10. In this way, by setting a bifurcated structure on the main covered stent 30, the problems of difficult construction and low construction accuracy of the bifurcated blood vessel in special lesion sites such as bifurcated blood vessels and aortic arch parts are solved, and the difficulty of minimally invasive surgery is reduced. At the same time, the branch reconstruction section 300 is arranged between the proximal fixing portion 100 and the distal fixing portion 400 to improve the position stability and connection stability of the branch reconstruction section 300 through the proximal fixing portion 100 and the distal fixing portion 400 built on the healthy aorta, and then provide a stable anchoring area for the working environment of the branch stent 10, thereby improving the anchoring stability of the branch stent 10.

[0073] It should be noted that the connection hole 301 is configured to extend radially along the branch reconstruction section 300. That is to say, the connection hole 301 can be opened at any position and in any direction on the side wall of the branch reconstruction section 300, with the arbitrariness and flexibility of the setting position / opening direction, and this position does not include the axial ends of the branch reconstruction section 300.

[0074] See Figure 5 , in an example, a plurality of connection holes 301 are arranged on the branch reconstruction section 300, and the plurality of connection holes 301 are spaced axially along the branch reconstruction section 300 to enable the main covered stent 30 to adapt to the lesion sites at different bifurcation positions. In addition, the shapes of the plurality of connection holes 301 can be the same or different; the apertures of the plurality of connection holes 301 can be the same or different to meet the anchoring of branch stents 10 of different models.

[0075] In an example, the edge of the connection hole 301 is a smooth curve. The connection hole 301 can be any one or a combination of a circle, an ellipse, a square, a combined arc shape, a rhombus, a polygon, etc.

[0076] See Figure 1 and Figure 2 In one example, the proximal fixing portion 100 includes a proximal membrane 110 and a proximal support framework 120. The proximal membrane 110 constitutes a sealing member of the proximal support framework 120, forming a proximal blood flow channel. The distal fixing portion 400 includes a distal membrane 410 and a distal support framework 420. The distal membrane 410 constitutes a sealing member of the distal support framework 420, forming a distal blood flow channel. Under the action of the proximal support framework 120 / distal support framework 420, the proximal fixing portion 100 / distal fixing portion 400 has greater rigidity, meeting the requirements for the support and stable connection of the proximal and distal connection segments 200 and the branch reconstruction segment 300. The shape of the proximal membrane 110 and / or the distal membrane 410 can be a straight tube shape, a frustum shape, or a combination thereof. The proximal membrane 110 and / or the distal membrane 410 are prepared from polymer materials with good biocompatibility, such as materials like ePTFE, PET, etc.; materials suitable for the degradation period can also be selected, such as materials like polylactic acid, etc.

[0077] Furthermore, the proximal support framework 120 and / or the distal support framework 420 can adopt a compressed metal framework structure, such as a Z-wave, a saddle-shaped wave, etc. The proximal support framework 120 and / or the distal support framework 420 are prepared from metal materials with good biocompatibility and elasticity, such as titanium-nickel alloy, stainless steel, cobalt-chromium alloy, etc.; they can also be prepared from materials with a suitable degradation period, such as iron, polylactic acid, etc.

[0078] In one example, the proximal and distal connection segment 200 and / or the branch reconstruction segment 300 include a membrane structure. The membrane structure is hollow, forming a channel for blood flow. Due to the membrane characteristics of the membrane structure, the proximal and distal connection segment 200 and the branch reconstruction segment 300 have greater flexibility, meeting the flexibility requirements of the main membrane stent 30.

[0079] In one example, the main membrane stent 30 further includes a radiopaque member, and the radiopaque member is disposed at positions that need to be radiopaque, such as both ends of the proximal fixing portion 100, the distal fixing portion 400, the branch reconstruction segment 300, and the connection hole 301.

[0080] In one example, the process of manufacturing the main membrane stent 30 is as follows: First, use a titanium-nickel alloy wire to complete the weaving and shaping of the support frameworks of the proximal fixing portion 100 and the distal fixing portion 400, and then perform ePTFE membrane coating on the shaped metal framework (first perform inner layer membrane coating on the membrane coating die rod, then place the shaped metal framework on the inner layer coating, and spray the outer layer coating on the outside of the metal framework), and finally pressurize and shape the entire product to complete the manufacturing.

[0081] In one possible implementation manner, the center line of the branch reconstruction segment 300 is parallel to the center line of the main membrane stent 30.

[0082] In this embodiment, the setting requirements of the branch reconstruction section 300 on the overall main covered stent 30 are optimized. Specifically, the branch reconstruction section 300 is arranged in parallel with the proximal fixing portion 100 / distal fixing portion 400 / proximal and distal communication section 200. In this way, blood vortices can be avoided from forming in the branch reconstruction section 300, and the formation of thrombus can be effectively reduced.

[0083] In one example, the center line of the branch reconstruction section 300 can also form a certain angle with the center line of the main covered stent 30, allowing reasonable processing errors to exist.

[0084] In a possible implementation manner, the branch reconstruction section 300 includes an extension portion (not shown in the figure), and the extension portion is located at the periphery of the connection hole 301.

[0085] In this embodiment, the specific configuration of the branch reconstruction section 300 is optimized. Specifically, the portion at the periphery of the connection hole 301 of the branch reconstruction section 300 is configured as an extension portion with a relatively large elongation rate to achieve the local ductility of the branch reconstruction section 300. When the branch stent 10 is implanted, the extension portion can make the size of the connection hole 301 slightly larger than the original size of the connection hole 301. After the branch stent 10 is implanted, the outer wall of the branch stent 10 can be well covered by the extension portion, improving the anchoring effect of the branch reconstruction section 300 on the branch stent 10.

[0086] In one example, the material of the extension portion can be EPTEFE or silicone rubber, etc. However, it is not limited to the above materials. As long as the external expansion pressure of the extension portion is greater than its deformation force, that is to say, the extension portion can generate deformation under the action of the external expansion force.

[0087] In one example, the entire branch reconstruction section 300 can be made of an extension material with a relatively large elongation rate to improve the clinical application range.

[0088] See Figure 6 , in a possible implementation manner, the branch reconstruction section 300 includes a first branch section 310, a connection portion 320, and a second branch section 330 arranged in sequence. One end of the first branch section 310 away from the connection portion 320 communicates with the proximal fixing portion 100, one end of the second branch section 330 away from the connection portion 320 communicates with the distal fixing portion 400, and the connection hole 301 is correspondingly arranged at the connection portion 320.

[0089] In this embodiment, the specific configuration of the branch reconstruction segment 300 is optimized. Specifically, the branch reconstruction segment 300 is configured as a combined component at least including a first branch segment 310, a connecting portion 320, and a second branch segment 330. Both the first branch segment 310 and the second branch segment 330 are provided with continuous film coatings, and the film coating is disconnected at the connecting portion 320. At this time, a connection hole 301 can be provided or not provided. In this way, the length of the anchoring area of the clinically implanted branch stent 10 can be ensured by the first branch segment 310 and the second branch segment 330, and the anchoring stability of the branch stent 10 is ensured; then, the 360° circumferential protrusion of the branch stent 10 is realized through the disconnected connecting portion 320, and it is not limited to the position of the connection hole 301 to protrude. It can be aimed at the branch vessels in different directions at the lesion site, reducing the alignment difficulty of the connection hole 301.

[0090] See Figure 7 , in a possible implementation manner, the connecting portion 320 includes a plurality of connecting silk threads 321. The plurality of connecting silk threads 321 are arranged at intervals along the circumference of the first branch segment 310 between the first branch segment 310 and the second branch segment 330, and the connecting silk threads 321 extend along the axial direction of the first branch segment 310.

[0091] In this embodiment, the specific configuration of the branch reconstruction segment 300 is further optimized. Specifically, the branch reconstruction segment 300 is configured as a combined component at least including a first branch segment 310, a plurality of connecting silk threads 321, and a second branch segment 330. The connecting silk threads 321 extend along the axial direction of the branch reconstruction segment 300, and both ends of the connecting silk threads 321 are respectively connected between the first branch segment 310 and the second branch segment 330. The plurality of connecting silk threads 321 are arranged at intervals along the circumference of the branch reconstruction segment 300. In this way, the axial supporting force of the branch reconstruction segment 300 is improved by the plurality of connecting silk threads 321.

[0092] At this time, a connection hole 301 can be provided at the corresponding position of the connecting silk thread 321, and the connecting silk thread 321 is not provided on one side of the position where the connection hole 301 is provided. It is also possible to make the guide wire of the delivery device 20 / the delivery device 20 pass through the gap between adjacent connecting silk threads 321 by reasonably designing the distance between adjacent connecting silk threads 321. In this way, the multi-directional export of the delivery device 20 / the guide wire can be improved by configuring a plurality of connecting silk threads 321 at the connecting portion 320, so as to realize the multi-directional export of the branch stent 10, make the main covered stent 30 adapt to the branch vessels in different directions at the lesion site, and improve the clinical application range of the main covered stent 30.

[0093] In an example, the connecting silk thread 321 is made of a flexible material.

[0094] See Figures 8 - 11, in a possible implementation, the main covered stent 30 further includes a third support frame 500, and the third support frame 500 is disposed on the covering of the branch reconstruction section 300 and / or the third support frame 500 is disposed on the covering of the proximal-distal communication section 200.

[0095] In this embodiment, the specific configuration of the main covered stent 30 is further optimized. Specifically, the main covered stent 30 is configured as a combined component including at least a proximal fixing portion 100, a proximal-distal communication section 200, a branch reconstruction section 300, a distal fixing portion 400, and a third support frame 500. The third support frame 500 is configured on the branch reconstruction section 300 (such as Figure 8 ), or the third support frame 500 is configured on the proximal-distal communication section 200 (such as Figure 9 ), or the third support frame 500 is configured on both the branch reconstruction section 300 and the proximal-distal communication section 200 (such as Figure 10 and Figure 11 ). In this way, good support is provided for the branch reconstruction section 300 and / or the proximal-distal communication section 200, and problems such as an overly large delivery system caused by an overly large cross-section of the branch reconstruction section 300 and / or the proximal-distal communication section 200, and the branch reconstruction section 300 and / or the proximal-distal communication section 200 being flattened at the lesion site are avoided.

[0096] In an example, the third support frame 500 is a metal framework. The third support frame 500 is configured on both the branch reconstruction section 300 and the proximal-distal communication section 200. At this time, the metal frameworks disposed on the branch reconstruction section 300 and the proximal-distal communication section 200 can be arranged in a staggered manner to improve the axial support force of the branch reconstruction section 300 and the third support frame 500 while reducing the occupied space in the radial direction of the branch reconstruction section 300 and the third support frame 500.

[0097] See Figure 12 , in a possible implementation, the radial dimension of the proximal-distal communication section 200 is greater than the radial dimension of the branch reconstruction section 300.

[0098] In this embodiment, to ensure that the connection hole 301 is not blocked after the main covered stent 30 is compressed, the radial dimension of the proximal-distal communication section 200 is configured to be greater than the radial dimension of the branch reconstruction section 300. In addition, to further reduce the risk of blockage of the connection hole 301, the connection hole 301 can also be configured inside the tangent of the radial cross-section of the proximal-distal communication section 200 and the branch reconstruction section 300.

[0099] Specifically, the work done by the blood vessels at the lesion site on the main covered stent 30 is constant. The force exerted by the blood vessels on the proximal and distal connection section 200 is F1, the cross-sectional diameter of the proximal and distal connection section 200 is L1, and the deformation amount generated by the main covered stent 30 under the action of F1 is ΔL1. The force exerted by the blood vessels on the branch reconstruction section 300 is F2, the cross-sectional diameter of the branch reconstruction section 300 is L2, and the deformation amount generated by the main covered stent 30 under the action of F2 is ΔL2. As Figure 12 , if the work done by the blood vessels on the main covered stent 30 is the same, then F1 * ΔL1 = F2 * ΔL2. To ensure that each lumen is unobstructed and not crushed when the aneurysm cavity is small, it is necessary to ensure that ΔL1 < L1 and ΔL2 < L2. Preset that the maximum value of ΔL1 is infinitely close to L1, and the maximum value of ΔL2 is infinitely close to L2, that is, ΔL1 ≈ L1 and ΔL2 ≈ L2. At this time, F1 * L1 = F2 * L2. When L1 > L2, to ensure that each lumen is unobstructed, it is necessary to ensure that under the condition of the same deformation amount, the deformation force F11 of the two lumens < F21, that is, the performance after implanting the main covered stent 30 into the lumen is F1 < F2. Therefore, to ensure that the connection holes 301 are not blocked after the main covered stent 30 is compressed, it is necessary to ensure that the radial cross-sectional diameter of the proximal and distal connection section 200 is greater than the radial cross-sectional diameter of the branch reconstruction section 300, and the connection holes 301 are inside the tangents of the radial cross-sections of the proximal and distal connection section 200 and the branch reconstruction section 300.

[0100] In a possible implementation manner, at least a part of the branch reconstruction section 300 is arranged outside the proximal and distal connection section 200.

[0101] In this embodiment, the specific configuration of the branch reconstruction section 300 is further optimized. Specifically, the relative positional relationship between the branch reconstruction section 300 and the proximal and distal connection section 200 can be selected as needed.

[0102] See Figures 1 to 12 , in an example, the branch reconstruction section 300 is entirely arranged outside the proximal and distal connection section 200 and is independent of the proximal and distal connection section 200. At this time, it is equivalent to bifurcating the liquid flow channel between the proximal fixing part 100 and the distal fixing part 400 to form two independent flow channels, so that the two independent flow channels can operate independently and avoid interference.

[0103] In addition, see Figures 13 to 18 , this application embodiment also provides a covered stent system, including a branch stent 10, a delivery device 20, and the main covered stent 30 as described above. The delivery device 20 is used to deliver the branch stent 10 and release the branch stent 10 at the connection holes 301 of the main covered stent 30, so that the branch stent 10 communicates with the branch reconstruction section 300 of the main covered stent 30 and the corresponding branch artery.

[0104] In this embodiment, the covered stent system is configured as a combined component including at least a main covered stent 30, a branch stent 10, and a delivery device 20. The delivery device 20 can implant the branch stent 10 into the lesion site through the path from the proximal fixing part 100 of the main covered stent 30 → the branch reconstruction segment 300 (the first branch segment 310) → the connection hole 301 or through the path from the distal fixing part 400 of the main covered stent 30 → the branch reconstruction segment 300 (the second branch segment 330) → the connection hole 301, and connect the two ends of the branch stent 10 to the branch reconstruction segment 300 and the branch blood vessel at the lesion site respectively. At this time, the proximal and distal communication segment 200 of the main covered stent 30 is connected to the main blood vessel at the lesion site through the proximal fixing part 100 and the distal fixing part 400. In this way, the bifurcated blood vessels at the lesion site are built by the main covered stent 30 and the branch stent 10 to realize blood supply to the lesion site. For example but not limited to, the delivery device 20 is a delivery sheath.

[0105] In a possible implementation manner, the covered stent system further includes a contrast catheter 40, which is used to perform contrast determination on the contrast component provided on the main covered stent 30, and then adjust the installation position of the main covered stent 30 according to the contrast determination result to improve the accuracy of building the bifurcated blood vessels at the lesion site.

[0106] The usage method of the covered stent system is as follows: First, implant the main covered stent 30 at the lesion site where the branch artery needs to be reconstructed. When implanting the main covered stent 30, try to orient the connection hole 301 of the branch reconstruction segment 300 towards the opening position of the branch blood vessel of the bifurcated blood vessel to complete the construction of the main blood vessel; then, select a suitable implantation path according to the orientation of the branch blood vessel (for example, Figure 13 , when the branch blood vessel faces downward, select to enter from the brachial artery above, and make the delivery device 20 implant the branch stent 10 through the path from the proximal fixing part 100 of the main covered stent 30 → the branch reconstruction segment 300 (the first branch segment 310) → the connection hole 301; as Figure 14 , when the branch blood vessel faces upward, select to enter from the femoral artery below, and make the delivery device 20 implant the branch stent 10 through the path from the distal fixing part 400 of the main covered stent 30 → the branch reconstruction segment 300 (the second branch segment 330) → the connection hole 301.). Then, sequentially implant the delivery device 20. When the delivery device 20 is sent to the designated position, release the branch stent 10 carried thereon, and make the branch stent 10 be built between the branch reconstruction segment 300 and the branch blood vessel of the bifurcated blood vessel to complete the construction of the branch blood vessel. As Figure 17; Meanwhile, determine whether the opening position of the branch vessel / the position of the partially released branch stent 10 is appropriate through the angiography catheter 40. At this time, since one end of the main covered stent 30 is occupied by the delivery device 20, the angiography catheter 40 needs to be introduced from the other end of the main covered stent 30. Determine the specific position of the branch stent 10 through the angiography of the angiography catheter 40, and adjust the delivery device 20 according to the actual angiography situation to adjust the position of the branch stent 10 and complete the precise implantation of the branch stent 10, such as Figure 15 and Figure 16 ; Finally, a vascular plug can also be implanted at one end of the angiography catheter 40 on the implanted branch reconstruction segment 300 to reduce the formation of thrombus on the branch reconstruction segment 300, such as Figure 18 .

[0107] Second Embodiment

[0108] Figure 19 The front view of the main covered stent 30 provided by the second embodiment of the present application is shown; Figure 20 The front view of another main covered stent 30 provided by the second embodiment of the present application is shown; Figure 21 Shown Figure 20 The radial cross-sectional view at B in Figure 22 Shown Figure 20 The enlarged view at B in

[0109] Refer to Figures 19 to 22 , this embodiment provides a main covered stent 30, which includes a proximal fixing portion 100, a proximal and distal communication section 200, a branch reconstruction section 300 and a distal fixing portion 400. The two ends of the proximal and distal communication section 200 are respectively communicated with the proximal fixing portion 100 and the distal fixing portion 400. The two ends of the branch reconstruction section 300 are respectively communicated with the proximal fixing portion 100 and the distal fixing portion 400. Connection holes 301 are arranged on the branch reconstruction section 300, and the connection holes 301 extend along the radial direction of the branch reconstruction section 300. The difference between the main covered stent 30 in this embodiment and the main covered stent 30 in the first embodiment is that: the connecting portion 320 in this embodiment includes a first support framework 322, the first support framework 322 is an open waveform structure, and the connection holes 301 are located on the open side of the first support framework 322.

[0110] Refer to Figure 19, in this embodiment, the specific configuration of the branch reconstruction section 300 is optimized. Specifically, the branch reconstruction section 300 is configured as a combined component at least including a first branch section 310, a first support skeleton 322, and a second branch section 330. The first support skeleton 322 extends along the axial direction of the branch reconstruction section 300, and both ends of the first support skeleton 322 are respectively connected between the first branch section 310 and the second branch section 330. In this way, the axial support force of the branch reconstruction section 300 is improved through the first support skeleton 322, and problems such as the collapse or swing of the connection hole 301 will not occur, which is convenient for branch reconstruction.

[0111] See Figure 20 and Figure 21 , in an example, the first support skeleton 322 is a metal skeleton, and the shape of the first support skeleton 322 is configured as an open waveform structure. At this time, the first support skeleton 322 is not provided at the connection hole 301. Since there is no first support skeleton 322 at the connection hole 301, when the branch stent 10 is implanted later, there is no hard object affecting it, so that the branch stent 10 can be deployed in a predetermined shape, which is beneficial to ensuring the blood supply of the branch stent 10.

[0112] See Figure 22 , in a possible implementation manner, one side of the first support skeleton 322 away from the connection hole 301 is connected to the proximal and distal communication section 200.

[0113] In this embodiment, to improve the connection stability of the first support skeleton 322, the first support skeleton 322 is connected to the proximal and distal communication section 200. In this way, when the main blood vessel of the bifurcated blood vessel bends, the position of the connection hole 301 of the branch reconstruction section 300 can bend synchronously with the proximal and distal communication section 200, preventing the branch reconstruction section 300 from bending, folding, and blocking, and the branch reconstruction section 300 tilting outwards, resulting in the connection hole 301 on the branch reconstruction section 300 being blocked by the blood vessel wall, affecting the problem of branch reconstruction.

[0114] The third embodiment

[0115] Figure 23 Shows the front view of the main covered stent 30 provided by the third embodiment of the present application; Figure 24 Shows Figure 23 The enlarged view at C in Figure 25 Shows Figure 23 The radial cross-sectional view at C in

[0116] See Figures 23 to 25, this embodiment provides a main covered stent 30, which includes a proximal fixing part 100, a proximal-distal communication section 200, a branch reconstruction section 300 and a distal fixing part 400. The two ends of the proximal-distal communication section 200 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. The two ends of the branch reconstruction section 300 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. A connection hole 301 is arranged on the branch reconstruction section 300, and the connection hole 301 extends along the radial direction of the branch reconstruction section 300. The difference between the main covered stent 30 in this embodiment and the main covered stent 30 in the second embodiment is that: the connection part 320 in this embodiment includes a second support framework 323, and the second support framework 323 is a ring structure.

[0117] In this embodiment, the specific configuration of the branch reconstruction section 300 is optimized. Specifically, the branch reconstruction section 300 is configured as a combined component at least including a first branch section 310, a second support framework 323 and a second branch section 330. The second support framework 323 extends along the axial direction of the branch reconstruction section 300, and the two ends of the second support framework 323 are respectively connected between the first branch section 310 and the second branch section 330. In this way, the axial support force of the branch reconstruction section 300 is improved through the second support framework 323. The volume of the second support framework 323 is very small after compression. Therefore, when it is deployed at the lesion site, the force decomposed by the second support framework 323 onto the blood vessel wall can overlap and strengthen, thereby providing a large compression force to the branch reconstruction section 300 and preventing the branch reconstruction section 300 from being flattened.

[0118] See Figure 23 and Figure 25 , in an example, the second support framework 323 is a metal framework, and the shape of the second support framework 323 is configured as a ring structure. At this time, the second support framework 323 is not provided at the connection hole 301, and the radial cross-sectional shape of the entire second support framework 323 presents a C shape. Since there is no second support framework 323 at the connection hole 301, when the branch stent 10 is implanted later, there is no hard object interference, so that the branch stent 10 can be deployed in a predetermined shape, which is beneficial to ensuring the blood supply of the branch stent 10.

[0119] See Figure 24 , in a possible implementation manner, the included angle α between the radial extension line of the second support framework 323 and the axial extension line of the branch reconstruction section 300 is 0° to 90°.

[0120] In this embodiment, to ensure that the second support framework 323 can be compressed and sheathed, and at the same time ensure that the second support framework 323 can be well deployed after being released from the delivery sheath, the included angle α between the radial plane of the second support framework 323 and the axis of the second support frame is configured to be 0° to 90°, and a more preferred selection is 45° to 90°.

[0121] Fourth Embodiment

[0122] Figure 26 The front view of the main covered stent 30 provided by the fourth embodiment of the present application is shown; Figure 27 The top view at the far - near communication section 200 provided by the fourth embodiment of the present application is shown.

[0123] Refer to Figure 26 and Figure 27 In this embodiment, a main covered stent 30 is provided, which includes a proximal fixing part 100, a far - near communication section 200, a branch reconstruction section 300, and a distal fixing part 400. The two ends of the far - near communication section 200 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. The two ends of the branch reconstruction section 300 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. Connecting holes 301 are arranged on the branch reconstruction section 300, and the connecting holes 301 extend along the radial direction of the branch reconstruction section 300. The difference between the main covered stent 30 in this embodiment and the main covered stent 30 in the first embodiment is that: the main covered stent 30 in this embodiment further includes a fourth support frame 600, and the fourth support frame 600 is sleeved on the outer sides of the branch reconstruction section 300 and the far - near communication section 200.

[0124] In this embodiment, the specific configuration of the main covered stent 30 is further optimized. Specifically, the main covered stent 30 is configured as a combined component including at least a proximal fixing part 100, a far - near communication section 200, a branch reconstruction section 300, a distal fixing part 400, and a fourth support frame 600. The fourth support frame 600 is configured on the branch reconstruction section 300 and the outer sides of the far - near communication section 200 to provide good support for the branch reconstruction section 300 and the far - near communication section 200; at the same time, since the part where the far - near communication section 200 contacts the branch reconstruction section 300 is still connected by a flexible film, after the main covered stent 30 is implanted into the lesion site, no matter how the main covered stent 30 is squeezed, the lumen of the far - near communication section 200 and the lumen of the branch reconstruction section 300 will move synchronously and will not be flattened.

[0125] In one example, the fourth support frame 600 is a metal skeleton. The far - near communication section 200 and the branch reconstruction section 300 achieve axial support through a metal skeleton.

[0126] Fifth Embodiment

[0127] Figure 28 The front view of the main covered stent 30 provided by the fifth embodiment of the present application is shown; Figure 29 The side view of the main covered stent 30 provided by the fifth embodiment of the present application is shown.

[0128] Refer to Figure 28 and Figure 29, this embodiment provides a main covered stent 30, which includes a proximal fixing part 100, a proximal-distal communication section 200, a branch reconstruction section 300, and a distal fixing part 400. The two ends of the proximal-distal communication section 200 are respectively connected to the proximal fixing part 100 and the distal fixing part 400, and the two ends of the branch reconstruction section 300 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. A connection hole 301 is arranged on the branch reconstruction section 300, and the connection hole 301 extends along the radial direction of the branch reconstruction section 300. The difference between the main covered stent 30 in this embodiment and the main covered stent 30 in the first embodiment is that: an avoidance hole 201 is provided on the proximal-distal communication section 200 in this embodiment, the branch reconstruction section 300 includes a connected exposed section and an embedded section, the connection hole 301 is arranged on the embedded section, the avoidance hole 201 at least avoids the connection hole 301, and the branch reconstruction section 300 is connected to the proximal-distal communication section 200 at least at the periphery of the connection hole 301.

[0129] In this embodiment, the setting position of the branch reconstruction section 300 is further optimized to select the relative position relationship between the branch reconstruction section 300 and the proximal-distal communication section 200 as needed. Specifically, a part of the branch reconstruction section 300 is arranged outside the proximal-distal communication section 200, and another part of the branch reconstruction section 300 is arranged inside the proximal-distal communication section 200. In this way, when introducing the delivery device 20 and the contrast catheter 40, they can be bent freely without being restricted by the proximal-distal communication section 200, which is convenient for surgical operation.

[0130] In one example, the branch reconstruction section 300 (the first branch section 310) is arranged outside the proximal-distal communication section 200, and the branch reconstruction section 300 (the connection part 320 and the second branch section 330) is arranged inside the proximal-distal communication section 200. Based on this, the delivery device 20 can implant the branch stent 10 through the path of the proximal fixing part 100 → the outer first branch section 310 → the inner connection hole 301. At this time, the contrast catheter 40 implants the contrast end through the path of the distal fixing part 400 → the inner second branch section 330 → the inner connection hole 301; or, the delivery device 20 can also implant the branch stent 10 through the path of the distal fixing part 400 → the inner second branch section 330 → the inner connection hole 301. At this time, the contrast catheter 40 implants the contrast end through the path of the proximal fixing part 100 → the outer first branch section 310 → the inner connection hole 301.

[0131] Sixth Embodiment

[0132] Figure 30 Shows the front view of the main covered stent 30 provided in the sixth embodiment of the present application; Figure 31 Shows the side view of the main covered stent 30 provided in the sixth embodiment of the present application.

[0133] See Figure 30and Figure 31 , this embodiment provides a main covered stent 30, which includes a proximal fixing part 100, a proximal-distal communication section 200, a branch reconstruction section 300 and a distal fixing part 400. The two ends of the proximal-distal communication section 200 are respectively connected to the proximal fixing part 100 and the distal fixing part 400, and the two ends of the branch reconstruction section 300 are respectively connected to the proximal fixing part 100 and the distal fixing part 400. A connection hole 301 is arranged on the branch reconstruction section 300, and the connection hole 301 extends along the radial direction of the branch reconstruction section 300. The difference between the main covered stent 30 in this embodiment and the main covered stent 30 in the fifth embodiment is that: the branch reconstruction section 300 in this embodiment includes a connected exposed section and an embedded section, and the connection hole 301 is arranged on the exposed section.

[0134] In this embodiment, the setting position of the branch reconstruction section 300 is further optimized to select the relative position relationship between the branch reconstruction section 300 and the proximal-distal communication section 200 as needed. Specifically, a part of the branch reconstruction section 300 is arranged outside the proximal-distal communication section 200, and another part of the branch reconstruction section 300 is arranged inside the proximal-distal communication section 200. In this way, when introducing the delivery device 20 and the contrast catheter 40, they can be bent freely without being restricted by the proximal-distal communication section 200, which is convenient for surgical operation. The position of the exposed section arranged outside the proximal-distal communication section 200 and the position of the embedded section arranged inside the proximal-distal communication section 200 in this embodiment are opposite to those in the fifth embodiment, and the other structures are the same, so they will not be elaborated here one by one.

[0135] Seventh Embodiment

[0136] Figure 32 Show the front view of the main covered stent 30 provided in the seventh embodiment of the present application; Figure 33 Show the side view of the main covered stent 30 provided in the seventh embodiment of the present application; Figure 34 Show the top view of the proximal-distal communication section 200 provided in the seventh embodiment of the present application.

[0137] See Figures 32 to 34, this embodiment provides a main covered stent 30, which includes a proximal fixing portion 100, a proximal-distal communication section 200, a branch reconstruction section 300, and a distal fixing portion 400. The two ends of the proximal-distal communication section 200 are respectively connected to the proximal fixing portion 100 and the distal fixing portion 400. The two ends of the branch reconstruction section 300 are respectively connected to the proximal fixing portion 100 and the distal fixing portion 400. A connection hole 301 is arranged on the branch reconstruction section 300, and the connection hole 301 extends along the radial direction of the branch reconstruction section 300. The difference between the main covered stent 30 in this embodiment and the main covered stent 30 in the first embodiment is that: an avoidance hole 201 is provided on the proximal-distal communication section 200 in this embodiment, the branch reconstruction section 300 is embedded in the proximal-distal communication section 200, the avoidance hole 201 at least avoids the connection hole 301, and the branch reconstruction section 300 is connected to the proximal-distal communication section 200 at least at the periphery of the connection hole 301.

[0138] In this embodiment, the setting position of the branch reconstruction section 300 is further optimized to select the relative position relationship between the branch reconstruction section 300 and the proximal-distal communication section 200 as needed. Specifically, the branch reconstruction section 300 is entirely arranged inside the proximal-distal communication section 200. In this way, since the branch reconstruction section 300 is completely embedded in the component communication section, the lumen channel of the entire branch reconstruction section 300 is relatively straight, avoiding the problem of thrombus formation caused by blood vortex.

[0139] In an example, the side wall of the branch reconstruction section 300 where the connection hole 301 is provided coincides with the side wall of the proximal-distal communication section 200 where the avoidance hole 201 is provided. These two can share a covered side wall, or two covered side walls can be stacked and used.

[0140] Eighth Embodiment

[0141] Figure 35 Shows a three-dimensional structural schematic diagram of the main covered stent 30 provided by the eighth embodiment of the present application; Figure 36 Shows a front view of the main covered stent 30 provided by the eighth embodiment of the present application; Figure 37 Shows a front view of another main covered stent 30 provided by the eighth embodiment of the present application; Figures 38 to 41 Shows an operation diagram of the covered stent system provided by the eighth embodiment of the present application for building blood vessels in different states.

[0142] See Figures 35 to 37, this embodiment provides a main covered stent 30, which includes a proximal fixing part 100, a proximal-distal communicating section 200, a branch reconstruction section 300 and a distal fixing part 400. The two ends of the proximal-distal communicating section 200 are respectively communicated with the proximal fixing part 100 and the distal fixing part 400. The two ends of the branch reconstruction section 300 are respectively communicated with the proximal fixing part 100 and the distal fixing part 400. A connection hole 301 is arranged on the branch reconstruction section 300, and the connection hole 301 extends along the radial direction of the branch reconstruction section 300. The difference between the main covered stent 30 in this embodiment and the main covered stent 30 in the first embodiment is that: in this embodiment, there are multiple branch reconstruction sections 300, and the multiple branch reconstruction sections 300 are distributed at intervals along the circumference of the proximal fixing part 100 between the proximal fixing part 100 and the distal fixing part 400.

[0143] In this embodiment, the main covered stent 30 is configured as a combined component including at least the proximal fixing part 100, the proximal-distal communicating section 200, multiple branch reconstruction sections 300 and the distal fixing part 400. The multiple branch reconstruction sections 300 are wound around the circumferential side of the proximal-distal communicating section 200 with the axis of the proximal-distal communicating section 200 as the center. In this way, the construction of the multi-directional branch stent 10 of the main covered stent 30 can be realized; in addition, the multiple branch reconstruction sections 300 can also be used simultaneously to enable the main covered stent 30 to adapt to the situation where the lesion site has multiple branch blood vessels and improve the applicable range of the main covered stent 30.

[0144] In an example, see Figures 38 to 41 , taking the lesion site of thoracoabdominal aortic aneurysm as an example. First, implant the main covered stent 30 provided in this application, such as Figure 38 . The branch blood vessels at the lesion site face downward. Select the brachial artery access that is beneficial to branch implantation, introduce the delivery sheath and the first guide wire to the opening of the branch blood vessel, and then implant the angiography catheter 40 and the second guide wire from the femoral artery access, such as Figure 39 ; specifically, determine the opening position of the branch blood vessel through the angiography catheter 40 according to the need, introduce the first guide wire into the branch blood vessel according to the opening position of the branch blood vessel, and then introduce the branch stent 10 along the first guide wire. At this time, the position of the branch stent 10 can be determined again according to the angiography catheter 40, and the construction of the branch stent 10 can be completed according to the position information of the branch stent 10, such as Figure 40 . Then, according to the orientation of the branch blood vessels, select a suitable access to complete the construction of other branch blood vessels, such as Figure 41 . For those with connection holes 301 but without branch reconstruction operations, implant a vascular plug in the branch reconstruction section 300 or place a vascular plug at the connection hole 301 for occlusion.

[0145] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be used.

[0146] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0147] The above are only specific embodiments of the present invention, which enable those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A main covered stent, characterized in that, It includes a proximal fixing part, a proximal-distal connecting section, a branch reconstruction section and a distal fixing part. The two ends of the proximal-distal connecting section are respectively connected to the proximal fixing part and the distal fixing part. The two ends of the branch reconstruction section are respectively connected to the proximal fixing part and the distal fixing part. A connecting hole is arranged on the branch reconstruction section, and the connecting hole extends along the radial direction of the branch reconstruction section.

2. The main covered stent according to claim 1, characterized in that, The center line of the branch reconstruction section is parallel to the center line of the main covered stent.

3. The main covered stent according to claim 1, characterized in that, The branch reconstruction section includes an extension part, and the extension part is located at the periphery of the connecting hole.

4. The main covered stent according to claim 1, characterized in that, The branch reconstruction section includes a first branch segment, a connecting part and a second branch segment arranged in sequence. One end of the first branch segment far from the connecting part is connected to the proximal fixing part, one end of the second branch segment far from the connecting part is connected to the distal fixing part, and the connecting hole is arranged corresponding to the connecting part.

5. The main covered stent according to claim 4, characterized in that, The connecting part includes a plurality of connecting silk threads. The plurality of connecting silk threads are arranged around the first branch segment at intervals in the circumferential direction between the first branch segment and the second branch segment, and the connecting silk threads extend along the axial direction of the first branch segment.

6. The main covered stent according to claim 4, characterized in that, The connecting part includes a first support skeleton, and the first support skeleton is an open waveform structure. The connecting hole is located on the open side of the first support skeleton.

7. The main covered stent according to claim 6, characterized in that, One side of the first support skeleton far from the connecting hole is connected to the proximal-distal connecting section.

8. The main covered stent according to claim 4, characterized in that, The connecting part includes a second support skeleton, and the second support skeleton is a ring structure.

9. The main covered stent according to claim 8, wherein, The included angle between the radial extension line of the second support skeleton and the axial extension line of the branch reconstruction section is 0° to 90°.

10. The main covered stent according to claim 1, characterized in that, The main covered stent further includes a third support frame, and the third support frame is arranged on the covering film of the branch reconstruction section and / or the third support frame is arranged on the covering film of the proximal-distal connecting section.

11. The main covered stent according to claim 1, wherein, The main covered stent further includes a fourth support frame, and the fourth support frame is sleeved outside the branch reconstruction section and the proximal-distal connecting section.

12. The main covered stent according to claim 1, characterized in that, At least a part of the branch reconstruction section is arranged outside the proximal-distal connecting section.

13. The main covered stent according to claim 12, characterized in that, An avoidance hole is arranged on the proximal-distal connecting section. The branch reconstruction section includes a connected exposed section and an embedded section. The connecting hole is arranged on the embedded section. The avoidance hole at least avoids the connecting hole, and the branch reconstruction section is connected to the proximal-distal connecting section at least at the periphery of the connecting hole.

14. The main covered stent according to claim 12, characterized in that, The branch reconstruction section includes a connected exposed section and an embedded section, and the connecting hole is arranged on the exposed section.

15. The main covered stent according to claim 1, characterized in that, An avoidance hole is arranged on the proximal-distal connecting section. The branch reconstruction section is embedded in the proximal-distal connecting section. The avoidance hole at least avoids the connecting hole, and the branch reconstruction section is connected to the proximal-distal connecting section at least at the periphery of the connecting hole.

16. The main covered stent according to claim 1, wherein, There are a plurality of branch reconstruction sections, and the plurality of branch reconstruction sections are distributed at intervals along the periphery of the proximal fixing part between the proximal fixing part and the distal fixing part.

17. A covered stent system, characterized in that, It includes a branch stent, a delivery device and the main covered stent according to any one of claims 1 to 16. The delivery device is used to deliver the branch stent and release the branch stent at the connecting hole of the main covered stent, so that the branch stent communicates with the branch reconstruction section of the main covered stent and the corresponding branch artery.

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