Covered stent and stent system

Abstract

The present application relates to a kind of film-covered stents and stent systems, the film-covered stent includes main body stent and wrapping piece, the main body stent includes main body wave and main body film, the main body film is covered in the main body wave, the wrapping piece is connected with the main body stent by binding line, the main body stent includes binding accessory, the binding accessory includes a portion of the main body wave or includes binding line, the binding accessory extends along the main body film, the main body film includes first perforation and second perforation, the first perforation and the second perforation are respectively arranged in the two sides of the binding accessory extension direction, the binding line passes through the first perforation and the second perforation and across the binding accessory.The binding line of the film-covered stent provided by the present application passes through the main body film, across the binding accessory, when film-covered stent is loaded or released, envelope, main body film is pulled by binding line and stressed, binding line is mainly pulled to binding accessory, when binding line is stressed, the possibility of the membrane hole of first perforation and second perforation can be reduced to expand, to prevent internal leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a covered stent and a stent system. BACKGROUND

[0002] In the past decade, aortic covered stent endovascular exclusion has been widely used in thoracic and abdominal aortic aneurysm and arterial dissection, and its curative effect is accurate, with small trauma, fast recovery and few complications, and it has become a first-line treatment. For aortic aneurysm or arterial dissection involving the branch of the aortic arch, abdominal aortic trunk, bilateral renal artery or superior mesenteric artery, the use of a covered stent will affect the blood supply of the branch blood vessel. In view of this situation, a corresponding hole is provided on the covered stent to perfuse the blood flow supply of the branch blood vessel, and the diameter of the hole is close to that of the branch blood vessel. How to ensure that the hole can exactly coincide with the branch blood vessel is the key to branch reconstruction. The common way is to use a binding line to constrain the stent circumferentially so that the stent is radially compressed. After the stent is released from the sheath tube of the delivery device, it is in a radially compressed state, so that the doctor can operate the alignment in the operation to adjust the position of the stent to accurately position it. Alternatively, for blood vessel positions where the aortic aneurysm or arterial dissection does not involve the branch, but there are certain requirements for stent positioning, the above-mentioned semi-constrained method can be used to further accurately position the stent before it is completely released.

[0003] However, the binding line used at present cannot completely wrap the stent in the axial direction, which may cause the following problems: the local stent is not covered by the binding line, and the metal wire on the stent has a strong self-expanding force, causing the local stent to be raised, making the outer surface of the stent rough. When the doctor adjusts the position of the stent, the raised part rubs against the blood vessel wall, causing the attached thrombus on the blood vessel wall to fall off and flow into the branch blood vessel, increasing the risk of surgery for the patient and affecting the postoperative treatment effect. To solve the above problems, a covering can be used to wrap the stent to radially constrain the stent, which can completely wrap all parts of the stent, making the compressed shape of the stent wrapped by the covering uniform in the axial direction. At the same time, it can ensure that the surface of the constrained stent is relatively smooth when it comes into contact with the blood vessel wall. The covering can be fixed on the stent by suturing with a suture. Since the suture is sewn, the suture passes through the main body covering. When the covered stent is loaded or released, the covering may move relative to the main body covering due to friction, causing the main body covering to be pulled and stressed by the binding line, which may cause the membrane hole in the main body covering through which the binding line passes to expand. SUMMARY

[0004] The present application at least solves one technical problem, that is, when the wrapping member is sewn to the main body covering of the main body stent by the binding line, how to reduce the risk of expansion of the membrane hole of the main body covering.

[0005] The present application provides a covered stent, which comprises a main stent and a wrapping piece, the main stent comprises a main wave coil and a main covering film, the main covering film is covered on the main wave coil, the wrapping piece is connected with the main stent through a binding wire, the main stent comprises a binding accessory, the binding accessory comprises a part of the main wave coil or comprises a binding wire, the binding accessory extends along the main covering film, the main covering film comprises a first perforation and a second perforation, the first perforation and the second perforation are respectively arranged on both sides of the extension direction of the binding accessory, and the binding wire passes through the first perforation and the second perforation and crosses the binding accessory.

[0006] In one of the embodiments, the binding wire is connected at a wave rod or a wave crest or a wave trough of the main wave coil;

[0007] Alternatively, one of the main wave coils is connected to a wave-shaped ring through a steel sleeve, the binding wire is connected to the main wave coil, and the binding wire is close to the edge of the steel sleeve.

[0008] In one of the embodiments, the main covering film comprises a linear film, and the linear film is wound along the circumferential direction of the main covering film;

[0009] The binding wire is connected to the wave rod of the main wave coil, and at least one linear film is arranged on the proximal end side and the distal end side of the binding wire;

[0010] Alternatively, the binding wire is connected to the wave crest of the main wave rod, and at least one linear film is arranged on the distal end side of the binding wire;

[0011] Alternatively, the binding wire is connected to the wave trough of the main wave rod, and at least one linear film is arranged on the distal end side of the binding wire.

[0012] In one of the embodiments, the main covering film comprises a linear film, and the linear film is wound along the circumferential direction of the main covering film; the shortest distance L1 of one of the linear films to the edge of the first perforation in the axial direction satisfies: L1≤3mm, and / or the shortest distance L2 of one of the linear films to the edge of the second perforation in the axial direction satisfies: L2≤3mm.

[0013] In one of the embodiments, a line where a straight line connecting the hole geometric center of the first perforation and the hole geometric center of the second perforation is located is defined as W1, the linear film comprises a first linear film, the first linear film is arranged on the proximal end side of the first perforation and the second perforation, and the included angle β1 between the first linear film and W1 satisfies: 0°≤β1≤20°.

[0014] In one of the embodiments, the linear film further comprises a second linear film, which is arranged at the distal end side of the first and second perforations, and the included angle β2 between the second linear film and W1 satisfies: 0°≤β2≤20°.

[0015] In one of the embodiments, the wrapping member comprises a buffer member, a third perforation and a fourth perforation, the buffer member extends along the plane where the wrapping member is located, the third and fourth perforations are arranged at both sides of the extension direction of the buffer member, the binding line passes through the first and second perforations and crosses the binding accessory, and then passes through the third and fourth perforations and crosses the buffer member to form a knot.

[0016] In one of the embodiments, the film-covered stent further comprises a branch stent, and the lumen of the branch stent is in communication with the lumen of the main body stent, the main body stent comprises a first side and a second side in the circumferential direction, the wrapping member is connected to the first side of the main body stent, and the branch stent is connected to the second side of the main body stent; the main body stent comprises a proximal end segment, and at least one binding accessory is arranged on the first side of the proximal end segment.

[0017] In one of the embodiments, the proximal end segment comprises a first main body wave ring and a second main body wave ring in sequence from the proximal end to the distal end, and the binding line comprises a first binding line and a second binding line.

[0018] The first binding line is arranged on the wave rod or wave crest or wave trough of the first side of the first main body wave ring, and the second binding line is arranged on the wave rod or wave crest or wave trough of the first side of the second main body wave ring.

[0019] Alternatively, the main body stent comprises a curved segment, which is closer to the distal end than the proximal end segment, and the curved segment comprises a third main body wave ring and a fourth main body wave ring in sequence from the proximal end to the distal end, the first binding line is arranged on the wave rod or wave crest or wave trough of the first side of the first or second main body wave ring, and the second binding line is arranged on the wave rod or wave crest or wave trough of the first side of the third or fourth main body wave ring.

[0020] The present application provides a stent system comprising the stent as described above, characterized in that the stent system further comprises a delivery device, the delivery device comprising a sheath core assembly, a support rod, a sheath tube, a diameter-releasable member, the sheath core assembly comprising an inner sheath core and an outer sheath core, the inner sheath core, the outer sheath core, the support rod and the sheath tube being sequentially sleeved from inside to outside, and the support rod being sleeved outside the sheath core assembly; the delivery device further comprises a guide head, the guide head being arranged at the distal end of the inner sheath core, and the distal end of the support rod and the proximal end of the guide head being arranged at intervals to form a loading space for the stent; and the diameter-releasable member is matched with the envelope to realize radial collection and release of the stent.

[0021] One technical effect of one embodiment of the present application is that, for the main body envelope, the binding wire crosses the binding accessory when passing through the main body envelope, and when the stent is loaded or released, the envelope and the main body envelope are pulled and stressed by the binding wire, and the binding wire mainly pulls the binding accessory, so that when the binding wire is stressed, the possibility of expansion of the membrane holes of the first and second perforations can be reduced, thereby preventing internal leakage. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure diagram of the stent provided by one embodiment of the present application;

[0023] Figure 2 Structure diagram of part of the stent provided by one embodiment of the present application (part of the main body envelope is omitted);

[0024] Figure 3 Structure diagram of part of the stent provided by one embodiment of the present application (part of the main body envelope is omitted) matched with the binding wire;

[0025] Figure 4 Planar development diagram of the envelope provided by one embodiment of the present application;

[0026] Figure 5 Structure diagram of the stent provided by another embodiment of the present application;

[0027] Figure 6 Structure diagram of the envelope connected with the main body stent provided by one embodiment of the present application (the main body envelope is omitted);

[0028] Figure 7 Structure diagram of part of the main body stent provided by one embodiment of the present application;

[0029] Figure 7a Structure diagram of part of the main body stent provided by another embodiment of the present application;

[0030] Figure 7bStructure diagram of a part of the main body support according to another embodiment of the present application;

[0031] Figure 8 Structure diagram of a part of the main body support according to another embodiment of the present application; Figure 7 Enlarged view of the portion B;

[0032] Figure 9 Structure diagram of a part of the main body support according to another embodiment of the present application;

[0033] Figure 10 Structure diagram of a part of the main body support according to another embodiment of the present application; Figure 9 Bent state diagram when applied to a curved blood vessel;

[0034] Figure 11 Structure diagram of a part of the main body support according to another embodiment of the present application;

[0035] Figure 12 Structure diagram of a part of the main body support according to another embodiment of the present application; Figure 11 Bent state diagram when applied to a curved blood vessel;

[0036] Figure 13 Structure diagram of a part of the main body support according to another embodiment of the present application; Figure 11 Right view of the portion C;

[0037] Figure 14 Structure diagram of a part of the main body support according to another embodiment of the present application; Figure 11 Structure diagram of a part of the main body support according to another embodiment of the present application

[0038] Figure 14a Figure 14 Enlarged view of the portion C;

[0039] Figure 15 Structure diagram of a part of the main body support according to another embodiment of the present application;

[0040] Figure 16 Structure diagram of a part of the main body support according to another embodiment of the present application;

[0041] Figure 16a Structure diagram of a part of the main body support according to another embodiment of the present application;

[0042] Figure 17 Structure diagram of a part of the main body support according to another embodiment of the present application;

[0043] Figure 18 Structure diagram of a part of the main body support according to another embodiment of the present application;

[0044] Figure 19 Structure diagram of a part of the main body support according to another embodiment of the present application; Figure 18Structure diagram of the partially released structure of the middle constraint section;

[0045] Figure 20 Structure diagram of the guide head and the inner sheath core provided by an embodiment of the present application;

[0046] Figure 21 Structure diagram of the clamping member in the rear release structure provided by an embodiment of the present application;

[0047] Figure 22 Diagram of the closed state formed by the clamping member and the clamping groove of the rear release structure provided by an embodiment of the present application;

[0048] Figure 23 The guide catheter passage through the branch blood vessels established when the stent system is implanted at the aortic arch provided by an embodiment of the present application;

[0049] Figure 24 Diagram of the stent system introduced to the aortic arch along the super-hard guide wire provided by an embodiment of the present application;

[0050] Figure 25 Diagram of the preliminary positioning of the stent system at the aortic arch after the rear withdrawal of the sheath tube provided by an embodiment of the present application;

[0051] Figure 26 Diagram of the alignment of the branch port of the covered stent of the stent system to the branch blood vessels provided by an embodiment of the present application;

[0052] Figures 27-28 Diagram of the stent system provided by an embodiment of the present application, in which the guide wire segment of the pull wire or suture structure is pulled rearward, so that the main stent is sequentially unfolded and adheres to the wall from the proximal end to the distal end;

[0053] Figure 29 Structure diagram of the relative Figure 28 Diagram of the unfolding and adhesion of the branch stent to the branch blood vessels by the rear withdrawal of the branch sheath;

[0054] Figure 30 Structure diagram of the stent system provided by another embodiment of the present application;

[0055] Figure 31 Structure diagram of the Figure 30 Structure diagram of the covered stent of the stent system;

[0056] Figure 32 Structure diagram of the Figure 31 Enlarged view of D;

[0057] Figure 33 Structure diagram of the preset guide catheter in the stent system provided by another embodiment of the present application;

[0058] Figure 34 A schematic diagram of the ultra-rigid guidewire being inserted into the aortic arch before implantation of the stent system provided in another embodiment of the present invention;

[0059] Figure 35 This is a schematic diagram of the stent system provided in another embodiment of the present invention being introduced into the aortic arch along an ultra-rigid guidewire;

[0060] Figure 36 For relative Figure 35 A schematic diagram showing the sheath being retracted so that the covered stent, which is wrapped in membrane, is exposed outside the sheath in a membrane-enclosed state.

[0061] Figure 37 For relative Figure 36 A schematic diagram showing how rotating the pre-bent section of the pre-placed conduit disengages it from the gap of the first bare wave ring.

[0062] Figure 38 For relative Figure 37 A diagram illustrating the direct insertion of a pre-placed catheter into a branch vessel.

[0063] Figure 39 For relative Figure 38 A schematic diagram showing the forward-propelled stent system aligned with the annular support member and the left subclavian artery;

[0064] Figure 40 For relative Figure 39 A schematic diagram showing how retracting the guidewire allows the membrane to open, and the covered support naturally expands to essentially adhere to the wall.

[0065] Figure 41 For relative Figure 40 A schematic diagram showing the release of the first bare wave coil using the post-release structure, and the retraction of the pre-placed catheter and delivery device;

[0066] Figure 42 For relative Figure 41 A schematic diagram showing the implantation of an external extension stent along the branch guidewire and the withdrawal of the branch guidewire;

[0067] Figure 43 This is a schematic diagram of the structure of the film-coated support provided in another embodiment of the present invention;

[0068] Figure 44 for Figure 43 The right view;

[0069] Figure 45 for Figure 43 The covered stent is guided into the aortic arch by the stent system along the ultra-hard guidewire, the sheath is then withdrawn to expose the capsule outside the sheath, and the pre-placed catheter is selected into the left common carotid artery.

[0070] Figure 46For relative Figure 45 Schematic diagram of pushing the stent system to the left common carotid artery against the annular support;

[0071] Figure 47 For relative Figure 46 Schematic diagram of withdrawing the bundle diameter guide wire to make the envelope open and the stent expand naturally to the basic wall;

[0072] Figure 48 For relative Figure 47 Schematic diagram of releasing the first bare coil by using the rear release structure and withdrawing the preset catheter and the delivery device;

[0073] Figure 49 For relative Figure 48 Schematic diagram of implanting an external extension stent to the left common carotid artery along the branch guide wire and withdrawing the branch guide wire;

[0074] Figure 50 For relative Figure 49 Implanting an external small stent to the left subclavian artery matched with the embedded stent. DETAILED DESCRIPTION

[0075] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0076] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "inner", "outer", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0077] "Axial" generally refers to the length direction of the medical device when it is being delivered, and "radial" generally refers to the direction perpendicular to the "axial" direction of the medical device, and the "axial" and "radial" directions of any component of the medical device are defined according to this principle. In addition, when describing a tubular stent or a stent graft, the orientation can be defined according to the direction of blood flow in the blood vessel, and in the present application, the blood flow is defined as flowing from the proximal end to the distal end of the stent. In the field of interventional medical devices, generally, when a medical device is implanted into the human or animal body, the delivery device for delivering the medical device is defined as the "proximal end" closer to the operator and the "distal end" farther away from the operator, and the "proximal end" and "distal end" of any component of the delivery device are defined according to this principle.

[0078] The "wave loop" in this invention is a closed annular structure, also known as a wave-shaped ring, made of woven or cut metallic elastic material. A single main wave loop can be connected to both ends of the wave-shaped metallic elastic material by a steel sleeve, thus making the main wave loop annular. This metallic elastic material includes known materials used in implanted medical devices or combinations of various biocompatible materials, such as alloys of two or more single metals from cobalt, chromium, nickel, titanium, magnesium, and iron, as well as 316L stainless steel, nickel-titanium-tantalum alloys, or other biocompatible metallic elastic materials. The wave loop has radial expansion capability, allowing it to radially contract under external force and recover its initial shape after the external force is removed, maintaining this initial shape. Therefore, after implantation into a lumen, its radial support force allows it to adhere tightly to the inner wall of the lumen. The waveform of the wave loop is unrestricted, including Z-shaped waves, M-shaped waves, V-shaped waves, sine waves, etc. The wave loop includes multiple peaks (also known as proximal apexes), multiple troughs (also known as distal apexes), and wave rods connecting adjacent peaks and troughs. In this process, a single wave is formed by a vertex (near or far vertex) and two wave rods connected to that vertex.

[0079] This invention provides a film-coated scaffold 100, such as Figure 1 As shown, the film-coated support 100 includes a main support 10, a first bare wave ring 20, and a wrapping element 30. The main support 10 includes a main wave ring 11 and a main film 12, with the main film 12 covering the main wave ring 11. The main wave ring 11 is a ring structure formed by connecting multiple waveform units end to end. Here, a waveform unit refers to a single-wave structure composed of wave crests, wave rods, and wave troughs, and the shape of the waveform unit is not limited. Each main wave ring 11 can be a regular ring structure formed by multiple waveform units of equal height, or it can be an irregular ring structure including high and low waves formed by waveform units of different wave heights. Adjacent main wave rings 11 can all be regular ring structures, or they can all be irregular ring structures including high and low waves, or they can be a combination of two types of ring structures: regular ring structures and irregular ring structures including high and low waves. This is not limited here.

[0080] The main body covering 12 is a tubular structure with openings at both ends. Multiple main body wave coils 11 are arranged axially and connected through the tubular main body covering 12 to form a tubular main body support 10. The distal end of the first bare wave coil 20 is connected to the proximal end of the main body support 10, and the first bare wave coil 20 is at least partially exposed outside the main body covering 12.

[0081] The wrapping member 30 is connected to one side of the main body support 10 or arranged around the main body support, and the wrapping member can releasably wrap the main body support 10 to compress or release the main body support 10 radially, so as to constrain the main body support 10 in the compressed state in the wrapping member or release the wrapping of the main body support 10 to expand naturally. In one embodiment, the wrapping member 30 can be provided as a wrapping film 30a, and in some embodiments described below, the wrapping member is described by taking the wrapping film as an example.

[0082] As shown in Figures 2-3 The main body film 12 includes a first film layer 121 and a linear film 122, and the linear film 122 is wound along the circumference of the main body film 12. The linear film 122 can be a plurality of wires wound in parallel to the radial direction along the circumference of the film support 100, or a single wire or a plurality of wires wound spirally along the circumference of the film support 100. The first film layer 121 is attached to one side of the main body wave coil 11, and the linear film 122 can be arranged between the first film layer 121 and the main body wave coil 11, on the side of the first film layer 121 away from the main body wave coil 11, or on the side of the main body wave coil 11 away from the first film layer 121, which is not limited herein. In one embodiment, the linear film 122 is arranged on the side of the main body wave coil 11 away from the first film layer 121, and can cooperate with the first film layer 121 to constrain the main body wave coil 11.

[0083] In one embodiment, the main body film 12 further includes a second film layer 123 attached to the side of the main body wave coil 11 away from the first film layer 121. The first film layer 121 is attached to the inner side of the main body wave coil 11, and the second film layer 123 is attached to the outer side of the main body wave coil 11. The linear film 122 is arranged between the main body wave coil 11 and the second film layer 123, and the linear film 122 is spirally wound upward along the circumference of the film support 100. The linear film 122, the first film layer 121, the first film layer 121 and the second film layer 123, and the linear film 122 and the second film layer 123 can be fixed together by gluing or hot pressing.

[0084] The linear film 122 can be a linear structure formed by a single wire or multiple wires, and the average linear diameter of the linear structure ranges from 0.05 mm to 0.3 mm. The cross-sectional area of the linear structure can be circular, elliptical, rectangular, etc., and the thickness of the linear structure in the extending direction can be uniform or non-uniform, which is not limited herein. When the cross-sectional area of the linear structure is non-circular, the thickness of the linear structure in the radial direction of the stent-graft 100 ranges from 0.05 mm to 0.3 mm. The linear film 122 can be made of a biocompatible polymer material such as PTFE wire. In one embodiment, the linear film 122 is spirally wound along the circumferential direction of the stent-graft 100, and the angle of the spiral rising ranges from 0° to 45°. For example, when the linear film 122 is spirally wound along the circumferential direction of the stent-graft 100, the angle of the spiral rising can be 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc. The linear film 122 can be spirally rising at equal intervals or non-equal intervals, and the linear film 122 can also be spirally spaced at equal intervals or non-equal intervals, which is not limited herein, as long as the linear film 122 passes around each wave.

[0085] As shown in Figure 1 The main stent 10 includes opposite first and second sides 10a and 10b in the circumferential direction, and each of the first and second sides 10a and 10b occupies an arc of 180° in the circumferential direction.

[0086] In combination with Figure 4As shown, the envelope 30a is connected to the first side 10a of the main support 10, and the envelope 30a is connected to the main support 10 by the binding wire 40. In one embodiment, the part of the envelope 30a close to the proximal end is connected to the main support 10 close to the proximal end by the binding wire. In the present embodiment, the axial length of the envelope 30a is equal to the axial length of the main envelope 12, and in other embodiments, the axial length of the envelope 30a can be approximately equal to the axial length of the main envelope 12. Here, "approximately equal" means that the difference between the axial length of the envelope 30a and the axial length of the main envelope 12 is less than or equal to 10%, so that the proximal end of the envelope 30a extends at least to the center of the main coil 11 closest to the proximal end, the distal end of the envelope 30a extends at least to the axial center of the main coil 11 farthest to the distal end, and the two ends of the envelope 30a do not excessively extend beyond the two ends of the main support 10. Define the larger one of the axial length of the envelope 30a and the axial length of the main envelope 12 as H1, and define the smaller one as H2. The axial length difference ratio between the two is (H1-H2) / H2. In one embodiment, the envelope is rectangular, the main envelope is tubular, and the axial length of the envelope is slightly larger than the axial length of the main envelope. As shown, the axial length of the envelope is H1, and the axial length of the main envelope is H2. Figures 4-5 As shown, the envelope 30a is connected to the first side 10a of the main support 10, and the envelope 30a is connected to the main support 10 by the binding wire 40. In one embodiment, the part of the envelope 30a close to the proximal end is connected to the main support 10 close to the proximal end by the binding wire. In the present embodiment, the axial length of the envelope 30a is equal to the axial length of the main envelope 12, and in other embodiments, the axial length of the envelope 30a can be approximately equal to the axial length of the main envelope 12. Here, "approximately equal" means that the difference between the axial length of the envelope 30a and the axial length of the main envelope 12 is less than or equal to 10%, so that the proximal end of the envelope 30a extends at least to the center of the main coil 11 closest to the proximal end, the distal end of the envelope 30a extends at least to the axial center of the main coil 11 farthest to the distal end, and the two ends of the envelope 30a do not excessively extend beyond the two ends of the main support 10. Define the larger one of the axial length of the envelope 30a and the axial length of the main envelope 12 as H1, and define the smaller one as H2. The axial length difference ratio between the two is (H1-H2) / H2. In one embodiment, the envelope is rectangular, the main envelope is tubular, and the axial length of the envelope is slightly larger than the axial length of the main envelope. As shown, the axial length of the envelope is H1, and the axial length of the main envelope is H2.

[0087] The envelope 30a is in a long strip structure. In one embodiment, the envelope 30a is in a rectangular sheet structure, and the length direction of the envelope 30a corresponds to the axial direction of the main support 10. At least one limiting hole 31 is arranged at the position close to the edge of each long side of the envelope 30a. When the main coil 11 is arranged in multiple along the axial direction, multiple limiting holes 31 are arranged along the axial direction at the positions close to the edges of the two long sides of the envelope 30a, so as to sequentially pass the bundle diameter guide wire 741 through the limiting holes 31 of the two long sides of the envelope 30a, so that the envelope 30a is enclosed into a tubular body, thereby wrapping the radially compressed envelope 30a. In the present embodiment, a limiting piece 35 is arranged between the limiting hole 31 and the edge of the envelope 30a, so as to prevent the membrane hole from expanding to the edge of the envelope 30a and breaking the closed state of the membrane hole, thereby avoiding the reliability of the bundle diameter guide wire 741 passing through the membrane hole to enclose the envelope 30a into a tubular body being reduced.

[0088] As shown, the envelope 30a is connected to the first side 10a of the main support 10, and the envelope 30a is connected to the main support 10 by the binding wire 40. In one embodiment, the part of the envelope 30a close to the proximal end is connected to the main support 10 close to the proximal end by the binding wire. In the present embodiment, the axial length of the envelope 30a is equal to the axial length of the main envelope 12, and in other embodiments, the axial length of the envelope 30a can be approximately equal to the axial length of the main envelope 12. Here, "approximately equal" means that the difference between the axial length of the envelope 30a and the axial length of the main envelope 12 is less than or equal to 10%, so that the proximal end of the envelope 30a extends at least to the center of the main coil 11 closest to the proximal end, the distal end of the envelope 30a extends at least to the axial center of the main coil 11 farthest to the distal end, and the two ends of the envelope 30a do not excessively extend beyond the two ends of the main support 10. Define the larger one of the axial length of the envelope 30a and the axial length of the main envelope 12 as H1, and define the smaller one as H2. The axial length difference ratio between the two is (H1-H2) / H2. In one embodiment, the envelope is rectangular, the main envelope is tubular, and the axial length of the envelope is slightly larger than the axial length of the main envelope. As shown, the axial length of the envelope is H1, and the axial length of the main envelope is H2.Figure 1 、 Figure 5 、 Figure 9 and Figure 11 As shown in FIG. 1, the envelope 30a is connected to the first side 10a of the main stent 10 by knotting the binding wire 40. When the envelope stent 100 is loaded or released, the envelope 30a can be subjected to frictional force to cause relative movement between the envelope 30a and the main envelope 12, so that the envelope 30a and the main envelope 12 are pulled by the binding wire 40, which can cause the membrane holes in the main envelope 12 and the membrane holes in the envelope 30a through which the binding wire 40 passes to be enlarged.

[0089] The envelope 30a further comprises a buffer 32 arranged in the middle region of the envelope 30a and extending along the plane in which the envelope 30a is located. In one embodiment, the buffer 32 can be arranged as a reinforcing wire extending in the axial direction, the binding wire 40 passes through the membrane holes of the envelope 30a and across the buffer 32; in other embodiments, the buffer 32 can also be arranged as a reinforcing wire extending in the transverse or oblique direction, the buffer 32 can be formed in the plane in which the envelope 30a is located or on the surface of the envelope 30a by heat treatment together with the envelope 30a; the envelope 30a can be selected as a PTFE film or a PET film, and the reinforcing wire can be selected as a PTFE wire or other biocompatible high molecular wire. The PTFE wire or film has good heat resistance, chemical inertness, self-lubricity and non-stickiness, is not easy to be wetted by tissue fluid, is corrosion-resistant, has the best aging life among plastics, is non-toxic, can withstand pressure, can be implanted into the human body, and can withstand a certain tension and pulling force. The PET film also has good physical and chemical properties and can be used as an envelope material.

[0090] The main stent 10 comprises a binding accessory 111 extending along the main envelope 12, the main envelope 12 comprises a first perforation 124 and a second perforation 125, the first perforation 124 and the second perforation 125 pass through the inside and outside of the main envelope 12 respectively, and the first perforation 124 and the second perforation 125 are arranged on the two sides of the extension direction of the binding accessory 111, the binding accessory 111 can be arranged as a wave rod of a main wave coil 11, i.e. the binding accessory 111 comprises a part of the main wave coil 11; the binding accessory 111 can also be a binding wire arranged on the main envelope 12, which can be fixed together with the main envelope 12 by means of gluing or hot-pressing bonding. In one embodiment, the binding accessory 111 is arranged at the proximal end of the main stent 10, the main stent 10 comprises a main wave coil 11 arranged at the proximal end, the binding wire 40 is connected to the wave rod or the wave crest or the wave trough of the main wave coil 11, i.e. the binding accessory 111 is arranged as the wave rod or the wave crest or the wave trough of the main wave coil 11; the main wave coil 11 is a wave-shaped meandering extension of a metal wire rod along the circumferential direction of the main stent 10 to form a wave-shaped ring with the first end connected to the second end, and the first perforation 124 and the second perforation 125 are arranged on the two sides of the extension direction of the binding accessory 111.

[0091] The envelope 30a includes a third perforation 33 and a fourth perforation 34, which are respectively arranged on both sides of the extension direction of the buffer 32. In one embodiment, the binding wire 40 can pass through the first perforation 124 and the second perforation 125, cross the binding accessory 111, pass through the third perforation 33 and the fourth perforation 34, and then be knotted after crossing the buffer 32. For the main body film, when the binding wire 40 passes through the main body film 12, it crosses the binding accessory 111. When the film support 100 is loaded or released, the envelope 30a and the main body film 12 are pulled by the binding wire 40, but the binding wire 40 mainly pulls the binding accessory 111. When the binding wire 40 is stressed, the possibility of the film hole of the first perforation 124 and the second perforation 125 being enlarged can be reduced, thereby preventing internal leakage. The arrangement of the buffer 32 can make the binding wire 40 mainly pull the buffer 32 when stressed, and the possibility of the film hole on the envelope 30a (at the third perforation 33 and the fourth perforation 34) being enlarged can be reduced when the binding wire 40 is stressed.

[0092] In other embodiments, the binding wire 40 passes through the first perforation 124 and the second perforation 125, crosses the binding accessory 111, and is knotted, and then passes through the third perforation 33 and the fourth perforation 34, and is knotted after crossing the buffer 32. For the main body film, on the one hand, when the binding wire 40 passes through the main body film 12, it crosses the binding accessory 111. When the film support 100 is loaded or released, the envelope 30a and the main body film 12 are pulled by the binding wire 40, but the binding wire 40 mainly pulls the binding accessory 111. When the binding wire 40 is stressed, the possibility of the film hole of the first perforation 124 and the second perforation 125 being enlarged can be reduced, thereby preventing internal leakage. On the other hand, the binding wire 40 passes through the first perforation 124 and the second perforation 125, crosses the binding accessory 111, and is knotted to form a breakpoint for force transmission, which can reduce the pulling force of the envelope on the main body film when the envelope is pulled by the binding wire, and has a certain limiting effect on the binding wire crossing the main body film, thereby further reducing the possibility of the film hole of the first perforation 124 and the second perforation 125 being enlarged. The arrangement of the buffer 32 can make the binding wire 40 mainly pull the buffer 32 when stressed, and the possibility of the film hole on the envelope 30a (at the third perforation 33 and the fourth perforation 34) being enlarged can be reduced when the binding wire 40 is stressed.

[0093] One or more than one fixing connection point can be arranged between the envelope 30a and the main support 10, and the fixing connection point is connected to the position corresponding to the binding accessory 111. In one embodiment, one fixing connection point is arranged between the envelope 30a and the main support 10, the binding wire 40 includes a first binding wire 41, the first binding wire 41 passes through the first perforation 124 and the second perforation 125 on the main envelope 12 and crosses a binding accessory 111, and two wire ends of the first binding wire 41 are located outside the main support 10. At this time, the first binding wire 41 can be knotted at one or two wire knots outside the main support 10, and the wire knot is finally formed between the envelope 30a and the main support 10. Then, the first binding wire 41 passes through the third perforation 33 and the fourth perforation 34 of the envelope 30a and is knotted on the side of the envelope 30a away from the main support 10 to prevent the binding wire 40 from loosening, and the knot of the binding wire 40 is formed outside the lumen of the envelope support 100, avoiding affecting the blood flow in the lumen. In other embodiments, as shown in Figure 5 two fixing connection points can be arranged between the envelope 30a and the main support 10, and the binding wire 40 further includes a second binding wire 42, which can be fixedly connected to the perforations at the corresponding positions on the envelope 30a and the envelope support 100 in the same way as the first binding wire 41, and details are not described herein.

[0094] In one embodiment, as shown in Figures 6-8 the first binding wire 41 is connected to the wave rod of the main wave coil 11, and at least one wire-shaped film 122 is arranged on the proximal end side and the distal end side of the first binding wire 41 to limit the first perforation 124 and the second perforation 125 from expanding towards the proximal end side and the distal end side. The shortest distance L1 of a wire-shaped film 122 to the edge of the first perforation 124 in the axial direction satisfies: L1≤3mm, and the shortest distance L2 of a wire-shaped film 122 to the edge of the second perforation 125 in the axial direction satisfies: L2≤3mm. In other embodiments, the first binding wire 41 can be connected to the wave crest of the main wave coil 11, and at least one wire-shaped film 122 is arranged on the distal end side of the first binding wire 41 to limit the perforation passing through the main envelope 12 on the inside of the wave crest bending. The first binding wire 41 can also be connected to the wave trough of the main wave coil 11, and at least one wire-shaped film 122 is arranged on the proximal end side of the first binding wire 41 to limit the perforation passing through the main envelope 12 on the inside of the wave trough bending. In other embodiments, the binding wire can also be connected to the main wave coil, and the edge of the binding wire close to the steel sleeve is arranged to limit the movement of the binding wire relative to the main envelope by the steel sleeve.

[0095] As shown in Figures 7-8As shown, the main wave ring 11 is formed by sequentially connecting a plurality of single waves, the main support 10 includes a main wave ring 11 arranged at the proximal end of the film support 100, the main wave ring 11 includes a first wave crest 1111, a first wave trough 1112, and a first wave rod 1113 connecting the first wave crest 1111 and the first wave trough 1112, the first wave rod 1113 is used as a binding accessory 111, the first perforation 124 and the second perforation 125 are arranged on both sides of the extension direction of the first wave rod 1113, the line where the connecting straight line of the geometric center of the hole of the first perforation 124 and the geometric center of the hole of the second perforation 125 is defined as W1, the intersection of W1 and the first wave rod 1113 is defined as Q, and the tangent line passing through point Q and tangent to the wave rod is defined as W2, wherein the included angle α of W1 and W2 satisfies: 60°≤α≤90° (the included angle range of the two straight lines is 0°-90°), in the case that the perpendicular distances of the first perforation 124 and the second perforation 125 to the first wave rod 1113 are both constant, if the included angle of W1 and W2 is too small, the line segment of the first perforation 124 and the second perforation 125 is too long, when the first binding wire 41 is subjected to a pulling force, it is not convenient to apply the main pulling force to the wave rod of the main wave ring 11, the stress on the edge of the film hole is reduced, which may cause the film hole to expand.

[0096] In one embodiment, the linear film 122 includes a first linear film 122a and a second linear film 122b, the first linear film 122a is arranged at the proximal end side of the first perforation 124 and the second perforation 125, and the second linear film 122b is arranged at the distal end side of the first perforation 124 and the second perforation 125, the included angle β1 between the first linear film 122a and W1 satisfies: 0°≤β1≤20°, so as to limit the proximal end side of the first perforation 124 and the second perforation 125, and avoid the possibility of the film hole of the first perforation 124 and the film hole of the second perforation 125 expanding towards the proximal end side; the included angle β2 between the second linear film 122b and W1 satisfies: 0°≤β2≤20° (in order to identify β1 and β2, the included angle between the parallel line of the linear film 122 and W1 is identified in the figure), so as to limit the distal end side of the first perforation 124 and the second perforation 125, and avoid the possibility of the film hole of the first perforation 124 and the film hole of the second perforation 125 expanding towards the distal end side.

[0097] The covered stent 100 can be used for implanting a curved blood vessel. When the covered stent 100 is in an implanting shape in the curved blood vessel, the first side 10a of the main stent 10 is defined as a side close to a small bending side of the blood vessel, and the second side 10b of the main stent 10 is defined as a side close to a large bending side of the blood vessel. Taking the curved shape of the main stent 10 implanted in the aortic arch as an example, the first side 10a and the second side 10b of the main stent 10 are further described. The first side 10a is a side of the main stent 10 away from the arch branch (small bending side), and the second side 10b is a side of the main stent 10 close to the arch branch (large bending side).

[0098] As shown in Figures 9-12 , the covered stent 100 can further include a branch stent 50 connected to an axial side of the main stent 10, and a lumen of the branch stent 50 is in communication with a lumen of the main stent 10. In this embodiment, as shown in Figure 9 , the envelope 30a is connected to the first side 10a of the main stent 10, the branch stent 50 is connected to the second side 10b of the main stent 10, and the branch stent 50 can be arranged at a circumferentially arc-shaped intermediate position of the second side 10b; in combination with Figure 13 , the main stent 10 further includes a plurality of connecting pieces 16 connecting two adjacent main wave coils 11, the connecting pieces 16 are arranged at the second side 10b of the main stent 10, and the connecting pieces 16 can be formed by extending one end of one main wave coil 11 to an adjacent main wave coil 11, or a plurality of separate connecting pieces can be used to connect two adjacent main wave coils 11 together in the axial direction, and the connecting pieces 16 are arranged continuously in the axial direction at the circumferential center of the second side 10b. The branch stent 50 is arranged on the circumferential center axis of the second side 10b, and part of the connecting pieces are arranged on the same axial line as the branch stent 50, so that the covered stent 100 is easy to bend towards the first side 10a and is not easy to bend towards the second side 10b; the connecting pieces near the branch stent 50 can be arranged on both axial sides of the branch stent 50 to avoid the position of the branch stent 50.

[0099] The main wave coil 11 includes high-low wave coils, and when the covered stent 100 is placed in a curved blood vessel, the high-low wave coils are arranged at the bending part of the covered stent 100. In this embodiment, the main wave coil 11 includes a plurality of high-low wave coils, the high-low wave coils include a plurality of continuous low single waves arranged at the first side 10a and a plurality of continuous high single waves arranged at the second side 10b, and the spacing of the low waves between adjacent high-low wave coils in the axial direction is large, so that when the covered stent 100 is implanted in a curved blood vessel, it is easy to bend towards the first side 10a.

[0100] As shown in Figure 9As shown, the main body support 10 comprises, from the proximal end to the distal end, a proximal end section 10c, a bending section 10d and a distal end section 10e, i.e. the bending section 10d is closer to the distal end than the proximal end section 10c, the flexibility of the first side 10a of the proximal end section 10c is less than that of the first side 10a of the bending section 10d, and the flexibility of the first side 10a of the distal end section 10e is less than that of the first side 10a of the bending section 10d, so that the bending section 10d is more prone to bend towards the first side 10a (here, the flexibility refers to the characteristic of the covered stent 100 being more prone to bend, which can be set by adjusting the interval distance of adjacent wave coils, and the interval distance of adjacent wave coils is greater, the flexibility is greater; the flexibility can also be adjusted by setting the connecting piece, and the flexibility is smaller at the position where the connecting piece is set).

[0101] In combination Figure 10 As shown, when the covered stent 100 is implanted in a curved blood vessel, the bending section 10d bends towards the first side 10a, so that the bending section 10d of the first side 10a is stacked, and since the envelope 30a is arranged on the first side 10a, if no fixed connection point is arranged on the proximal end section 10c of the envelope 30a, after the covered stent 100 is released, the proximal end side edge of the envelope 30a is severely beyond the proximal end side of the main body envelope 12 due to the stacking of the bending section 10d, thereby affecting the blood flow at the inflow end of the covered stent 100, causing unnecessary risks.

[0102] As shown, the first side 10a of the proximal end section 10c is arranged on the first side 10a of the main body support 10, and the first side 10a of the distal end section 10e is arranged on the second side 10b of the main body support 10, so that the first side 10a of the proximal end section 10c is arranged on the first side 10a of the main body support 10, and the first side 10a of the distal end section 10e is arranged on the second side 10b of the main body support 10. Figure 9 and Figure 11 In combination Figure 5 As shown, the binding accessory 111 comprises a first binding accessory 111a and a second binding accessory 111b, the first binding accessory 111a is closer to the proximal end of the main body support 10 than the second binding accessory 111b; the envelope 30a is connected to the first binding accessory 111a of the main body support 10 through the first binding wire 41, and is connected to the second binding accessory 111b of the main body support 10 through the second binding wire 42, so as to connect the envelope 30a to the main body support 10. In one embodiment, in combination Figure 11 As shown, the first binding accessory 111a is arranged on the first side 10a of the proximal end section 10c, and since when the covered stent 100 is implanted in a curved blood vessel, the position change of the proximal end section 10c is only due to the bending of the bending section 10d, and the bending of the proximal end section 10c itself is small, i.e. the first side 10a of the proximal end section 10c has less stacking, so that the edge between the main body envelope 12 from the corresponding perforated position of the first binding accessory 111a to the proximal end section and the corresponding envelope 30a part can be flush before and after implantation, thereby preventing the proximal end side edge of the envelope 30a from being severely beyond the proximal end side of the main body envelope 12, avoiding affecting the blood flow at the inflow end of the covered stent 100, as shown in Figure 12As shown. That is, the first side 10a of the proximal end section 10c is provided with at least one binding accessory 111, so that the envelope is fixedly connected to the body support at least one fixed connection point on the proximal end section, so that the relative position of the envelope 30a part from the position of the fixed connection point to the proximal end side and the corresponding proximal end section 10c of the body support 10 of the envelope 30a part is almost unchanged before and after implantation, thereby avoiding the situation that the proximal end side edge of the envelope 30a is severely beyond the proximal end side of the main body covering 12 due to the stacking of the first side 10a of the bending section 10d after implantation into the curved blood vessel.

[0103] In the present embodiment, as shown, Figure 11 The proximal end section 10c comprises a first body wave 11a and a second body wave 11b from the proximal end to the distal end, the first body wave 11a is a small wave with a smaller wave height relative to other body waves 11, and the second body wave 11b can be a small wave with the same height. The distal end of the proximal end section 10c is a circumferential surface where the wave trough of the second body wave 11b is located; the second body wave 11b can also be a high-low wave with the proximal end wave peak flush, and the first side 10a of the second body wave 11b is a low wave, and the second side 10b is a high wave. The distal end of the proximal end section 10c is a circumferential surface where the wave trough of the low wave of the second body wave 11b is located.

[0104] The bending section 10d comprises a third body wave 11c and a fourth body wave 11d from the proximal end to the distal end, wherein the third body wave 11c and the fourth body wave 11d are both high-low waves, the third body wave 11c can be a near-flat high-low wave or a far-flat high-low wave, and the fourth body wave 11d can also be a near-flat high-low wave or a far-flat high-low wave, to ensure that the axial distance between adjacent waves on the first side 10a of the bending section 10d is larger than that of the proximal end section 10c or the distal end section 10e, to ensure the flexibility of the bending section 10d, so that the bending section 10d of the covering stent 100 is more easily bent towards the first side 10a; wherein the near-flat high-low wave refers to the wave peak of the proximal end side high wave and low wave being flush, and the far-flat high-low wave refers to the wave trough of the distal end side high wave and low wave being flush.

[0105] In the present embodiment, the third body wave 11c is a near-flat high-low wave, the fourth body wave 11d is a far-flat high-low wave, and the axial distance d1 between the wave trough of the first side 10a of the first body wave 11a and the wave peak of the first side 10a of the second body wave 11b is smaller than the axial distance d2 between the low wave wave trough of the first side 10a of the third body wave 11c and the high wave wave peak of the first side 10a of the second body wave 11b; in the present embodiment, the first binding wire 41 is arranged on the wave rod or wave peak or wave trough of the first side 10a of the first body wave 11a, and the second binding wire 42 is arranged on the wave rod or wave peak or wave trough of the first side 10a of the second body wave 11b, as shown in Figures 7-7bAs shown, the first main wave coil 11a and the second main wave coil 11b are the main wave coils 11 used for connecting with the binding wire 40; in other embodiments, the first binding wire 41 is disposed on the wave rod, wave crest, or wave trough of the first side 10a of the first or second main wave coil 11b, and the second binding wire 42 is disposed on the wave rod, wave crest, or wave trough of the first side 10a of the third or fourth main wave coil 11d. In this case, the third main wave coil 11c connected with the first binding wire 41 includes a binding attachment 111, and the first main wave coil 11c connected with the second binding wire 42 includes a binding attachment 111. The third or fourth main body wave coil 11d also includes a binding accessory 111; it is only necessary to ensure that at least one connection position is provided on the first side 10a of the proximal segment 10c for the binding suture 40 to fix the connection, so that the relative position of the capsule 30a portion from the connection position to the proximal side and its corresponding main body stent 10 of the proximal segment 10c remains almost unchanged before and after implantation, thereby avoiding the situation where, after implantation into a tortuous blood vessel, the proximal edge of the capsule 30a significantly extends beyond the proximal side of the main body covering 12 due to the stacking of the first side 10a of the tortuous segment 10d.

[0106] like Figures 13-14a As shown, the main support 10 includes an annular support 13 and a window. The window is located on the side of the main support 10 and is used to communicate with the branch support 50. The annular support 13 is arranged along the window and is made of developing material. It is used to support the edge of the window and to show the position of the branch support 50.

[0107] The branch stent 50 includes a first end 51, a middle section 52, and a second end 53. The first end 51 and the second end 53 are oppositely arranged, and the middle section 52 is disposed between the first end 51 and the second end 53. The covered stent 100 also includes an annular connecting membrane 14, which connects the main stent 10 and the middle section 52 of the branch stent 50, thereby connecting the branch stent 50 to the main stent 10, such that the first end 51 of the branch stent 50 is located inside the lumen of the main stent 10, and the second end 53 of the branch stent 50 is located outside the lumen of the main stent 10. Figures 14-14a As shown.

[0108] The outer diameter of the branch stent 50 is smaller than the inner diameter of the annular support 13, and the radial width of the annular connecting membrane 14 is greater than the difference between the inner diameter of the annular support 13 and the outer diameter of the branch stent 50. This allows the annular connecting membrane 14 to allow the branch stent 50 to float vertically (radially) along the main stent 10. At the same time, the branch stent 50 can swing 360° along its tubular circumference, making the orientation of the opening at the second end of the branch stent 50 away from the main stent 10 adjustable. This makes it easier for the opening at the second end of the branch stent 50 to align with the branch vessel opening when using a guidewire to approach the branch vessel after the covered stent 100 is implanted into the blood vessel, thus reducing the impact of the complexity of the anatomical morphology on the correspondence between the opening at the second end of the branch stent 50 and the branch vessel opening. The annular connecting membrane connects the middle part of the branch support 50, so that part of the branch support 50 is located outside the main support 10 and part is located inside the main support 10. This ensures that the second end of the branch support 50 floats down to be flush with the main support 10. Within the range of the annular support, the orientation of the opening of the second end of the branch support 50 is adjustable, making it easier to adapt to different anatomical shapes.

[0109] The present invention also provides a support system 700, such as Figure 15 Combination Figures 20-22 As shown, the support system 700 includes the aforementioned covered support 100 and a conveyor 70. The conveyor 70 includes a sheath core assembly 71, a support rod 72, a sheath tube 73, a detachable bundle diameter member 74, and a handle assembly 75. The sheath core assembly 71 includes an inner sheath core 711 and an outer sheath core 712. The inner sheath core 711, outer sheath core 712, support rod 72, and sheath tube 73 are sequentially sleeved from the inside to the outside, and each pair of inner sheath cores 711, outer sheath cores 712, and sheath tube 73 can move relative to each other axially. The support rod 72 is sleeved on the outside of the sheath core assembly 71. The conveyor 70 also includes a guide head 76, which is disposed at the distal end of the inner sheath core 711. The distal end of the support rod 72 and the proximal end of the guide head 76 are spaced apart to form a loading space for the covered support 100. Figure 15 As shown, this illustration shows the internal components of the sheath 73 (the membrane support is omitted) for easier display of the internal structure of the sheath 73.

[0110] like Figures 16-16a As shown, the support rod 72 includes a first channel 721 and a second channel 722 that extend axially. The first channel 721 allows the sheath core assembly 71 to pass through axially, and the second channel 722 allows the bundle diameter guide wire 741 to pass through axially. Figure 16 As shown. In other embodiments, the support rod 72 may also include a third channel 723 through which the pre-placed conduit 79 passes axially, such as... Figure 16a As shown.

[0111] like Figure 17 Combination Figure 15As shown, the detachable bundle diameter member 74 may include a bundle diameter guide wire 741. The distal end of the detachable bundle diameter member 74 is sewn along the limiting holes 31 on the two long edges of the membrane 30a so that the membrane 30a can be opened to release the bracket. The proximal end of the detachable bundle diameter member 74 is connected to a safety buckle 743, which is detachably fixed to the handle assembly 75 to prevent the membrane bracket 100 from being accidentally released.

[0112] like Figure 17 As shown, the guide wire 741 is used to pass through the holes near the edges of the two long sides of the membrane 30a in a staggered manner along the axial direction, thereby wrapping the covered stent 100 inside the membrane 30a and radially compressing the covered stent 100 within the membrane 30a, so that the covered stent 100 is in a radially compressed bundled state. The distal end of the guide wire 741 is used to pass through the limiting holes 31 provided at the edges of the two long sides of the membrane 30a in a staggered manner along the axial direction, so as to enclose the membrane 30a into a tubular body, thereby radially compressing and constricting the covered stent 100 within the membrane 30a. The restriction of the guide wire 741 on the limiting holes 31 can be released by retracting the guide wire 741, thereby releasing the covered stent 100 from the compressed state and relieving the binding of the membrane 30a on the covered stent 100. The proximal end of the guide wire 741 is connected to a pull ring as a safety buckle 743. The pull ring is detachably fixed to the handle assembly 75. When it is necessary to release the covered support 100, first release the safety buckle 743 from the handle assembly 75, and then pull the safety buckle 743 back to open the film 30a, release the radial restraint on the covered support 100, and allow the covered support 100 to expand naturally.

[0113] like Figure 17 As shown, the stent system 700 also includes a branch sheath 77, which includes a wrapping portion 771, a hook portion 772, and a branch guide wire 773. The wrapping portion 771 is used to wrap the branch stent 50. The wrapping portion 771 is configured as a wrapping membrane with one open end and one closed end. The end of the wrapping portion 771 near the main stent 10 is open, and the end of the wrapping portion 771 away from the main stent 10 is closed. The hook portion 772 is located at the end of the wrapping portion 771 near the main stent 10, and the branch guide wire 773 is located at the end of the wrapping portion 771 away from the main stent 10. The hook portion 772 includes a loop for the guide wire 741 or the detachable suture structure 742 to pass through, so that the branch sheath 77 remains connected and fixed to the main stent 10 until the membrane 30a is opened to release the main stent 10. The branch guide wire 773 is used to assist the branch stent 50 of the covered stent 100 in accurately aligning with the branch vessel orifice.

[0114] In other implementations, such as Figures 18-19As shown, the diameter-releasing member 74 can also include releasable suture structure 742, which is axially threaded through the holes near the edges of the two long sides of the envelope 30a to radially compress the covered stent 100 within the envelope 30a. The diameter-releasing member 74 is not limited in this regard, but only needs to cooperate with the envelope 30a to achieve radial compression and release of the covered stent 100. As shown, Figure 18 The releasable suture structure 742 includes a constraining section 7421 and a lead section 7422. The constraining section 7421 is axially stitched to the edges of the two long sides of the envelope 30a to form a tubular structure of the envelope 30a, so as to compress the covered stent 100 radially within the envelope 30a. The lead section 7422 is formed by the portion of the constraining section 7421 extending out of the envelope 30a. Pulling the lead section 7422 can release the constraining section 7421 from the edges of the two long sides of the envelope 30a, so as to open the envelope 30a and release the radial compression of the covered stent 100, as shown, Figure 19

[0115] In other embodiments, the branch sheath can not be provided, but a pre-embedded guide wire (not shown) can be provided. The support rod 72 includes a channel for the pre-embedded guide wire to pass axially. Then, the pre-embedded guide wire is used to select the branch vessel opening. Since it is difficult to directly select the branch vessel opening with a single guide wire, the pre-embedded guide wire can be captured by a guide wire catcher to enter the branch vessel.

[0116] The branch guide wire 773 can be captured by a guide wire catcher (not shown) from the distal end of the delivery device 70 or by a method of using a branch guide wire to establish a branch access in advance for the branch guide wire 773 to pass through. One end of the branch guide wire 773 is captured out of the body along the branch vessel, so that the branch stent 50 can be accurately positioned to the branch vessel opening. After the covered stent 100 is accurately released, an external extension stent 90 can be implanted again according to needs, so that one end (close to the branch stent 50) of the extension stent 90 is sleeved in the branch stent 50, and the other end (far from the branch stent 50) of the extension stent 90 is placed in the branch vessel.

[0117] As shown, Figure 15 The handle assembly 75 includes a fixed handle 751, a sliding handle 752, and a wing 753. The proximal end of the fixed handle 751 includes a guide rail 7511 extending towards the proximal end. The proximal end of the sheath 73 is connected to the sliding handle 752. The sliding handle 752 is arranged on the proximal end side of the fixed handle 751 around the guide rail 7511, so that the sliding handle 752 can slide along the guide rail 7511 to drive the sheath 73 to retract, so as to release the tubular stent from the distal end of the sheath 73. The wing 753 is arranged on the proximal end side of the catheter. The wing 753 is provided with a channel communicating with the channel in the support rod 72, for the pre-embedded guide wire to pass out, so as to facilitate the operation of the pre-embedded guide wire.

[0118] ​As shown in Figures 20-22 The delivery device 70 further comprises a rear release structure for hooking the first bare coil 20, so as to achieve the rear release of the first bare coil 20 at the proximal end of the covered stent 100. The delivery device 70 comprises a clamping member 78 connected to the distal end of the outer sheath core 712; the clamping member 78 comprises a plurality of clamping claws 781 and a connecting portion 782, and the proximal end of the guide head 76 is provided with a clamping portion 761 and a clamping groove 762; the plurality of clamping claws 781 radiate and disperse from the connecting portion 782 toward the distal end, and the connecting portion 782 fixes the plurality of clamping claws 781 at intervals on the distal end of the outer sheath core 712, wherein the plurality of clamping claws 781 can be matched with the clamping groove 762 one by one; the clamping portion 761 is arranged on the distal end side of the clamping groove 762, and the clamping portion 761 comprises a clamping surface 7611 and a clamping step 7612; the inner circumferential surface of the sheath tube 73 is sleeved on the clamping surface 7611, and the distal end surface of the sheath tube 73 abuts against the clamping step 7612, so as to facilitate the guide head 76 to be embedded into the distal end of the sheath tube 73, and at the same time, the matched portions of the clamping claws 781 and the clamping groove 762 are accommodated in the sheath tube 73. It can be understood that the cooperation of the clamping member 78 and the clamping groove 762 forms the above-mentioned releasable rear release structure, that is, the rear release structure comprises the clamping member 78 and the clamping groove 762, the clamping member 78 and the clamping groove 762 are matched and embedded to form a closable state, and the clamping member 78 and the clamping groove 762 are away from each other to form an openable state; when in the closable state, the rear release structure can temporarily fix the first bare coil 20 at the proximal end of the covered stent 100 before the rear release.

[0119] Now taking the example of the way of using the guide wire along the branch to establish the branch access in advance for the branch guide wire 773 to pass through, a brief overview of the surgical method for implanting the stent system 700 provided by the embodiment into the aortic arch is given:

[0120] The guide wire (not shown in the figure) is introduced along the branch vessel access, from the proximal end to the distal end of the aorta, and finally out of the femoral artery incision, and then the guide catheter 81 is inserted along the guide wire from the branch vessel access, and out of the femoral artery, and then the guide wire is removed, so as to form the guide catheter 81 passage as shown in Figure 23

[0121] The super-hard guide wire 82 is introduced into the ascending aorta, and the stent system 700 is introduced along the super-hard guide wire 82, and the stent system 700 is slowly introduced into the human body along the super-hard guide wire 82, and at the same time, the branch guide wire 773 in the stent system 700 is introduced into the branch vessel from the femoral artery along the guide catheter 81, the branch guide wire 773 is pulled out of the guide catheter 81, and the branch guide wire 773 and the guide catheter 81 are pulled together, so as to introduce the distal end of the stent system 700 to the straight section close to the arch, as shown in Figure 24

[0122] ​​Continue to push the stent system 700 along the superhard guide wire 82, and the distal end of the stent system 700 is delivered to the arch of the aorta for the preliminary positioning of the stent system 700, and the sheath tube 73 of the delivery device 70 is retracted to the distal end of the main stent 10, so that the covered stent 100 wrapped by the envelope 30a is completely exposed to the sheath tube. Since the covered stent 100 is wrapped by the envelope 30a and is radially retracted, after the sheath tube 73 is retracted, the stent system 700 can still be adjusted along the superhard guide wire 82, so as to accurately position the covered stent 100. After the sheath tube 73 is retracted, the branch stent 50 is exposed, at this time, the branch guide wire 773 is pulled, and the main stent 10 is pushed to adjust. Under the auxiliary traction of the branch guide wire 773, the branch stent 50 is pulled into the branch blood vessel. Since the proximal end of the branch guide wire has the annular line (hooking part 772) and the diameter-reducing guide wire 741 interlocked, a certain external force can be used to pull the covered stent 100 through the branch guide wire 773, so that the branch opening of the covered stent 100 can be accurately aligned with the branch blood vessel, as shown in Figures 25-26 .

[0123] As shown in Figures 27-28 , the diameter-reducing guide wire 741 or the lead segment 7422 of the suture structure of the stent system 700 is pulled backward, and the main stent 10 is unfolded from the proximal end to the distal end and adheres to the wall in turn, so that the diameter-reducing guide wire 741 or the suture structure is completely removed from the covered stent 100, the envelope 30a is completely opened, and the main stent 10 is basically completely adhered to the wall (except that the first bare coil 20 at the proximal end is hooked by the rear release structure). In addition, since the diameter-reducing guide wire 741 or the suture structure is completely released and extracted, the interlocking and fixing of the annular line of the branch sheath 77 and the main stent 10 of the envelope 30a are released, and the branch guide wire 773 can be easily extracted. At this time, the branch stent 50 is completely unfolded and adheres to the branch blood vessel, as shown in Figure 29 .

[0124] The application also provides another stent system 700, as shown in Figure 30 , which comprises the above-mentioned covered stent 100, the delivery device 70 and the preset catheter 79. The delivery device 70 comprises the above-mentioned sheath core assembly 71, the support rod 72, the sheath tube 73, the diameter-reducing releasable member 74 and the handle assembly 75, that is, the stent system 700 does not comprise the above-mentioned branch sheath 77, and other structures are included. In addition, as shown in Figures 31-33As shown, the stent system 700 further comprises a preset catheter 79, which extends in the cavity of the main body stent 10 and is axially movable relative to the main body stent 10, and the distal end of the preset catheter 79 can pass through the branch stent 50. The preset catheter can be used to directly select the branch blood vessel, and the branch guide wire can be captured without puncturing or cutting the blood vessel at the other end of the branch blood vessel, thereby reducing the pain of the patient, avoiding the problem that the guide wire is easily entangled with the super-hard guide wire of the main body stent during the capturing process, and reducing the difficulty of the surgeon in the branch selection process and the operation time.

[0125] The covered stent comprises a semi-confining structure, which comprises a wrapping member, which can be a film or a wire, and the film or the wire can be used to radially confine the main body stent. When the preset catheter is provided, the semi-confining structure can be semi-confined by the film and the bundle diameter release member, or can be semi-confined by the wire corresponding to the wave coil interval and cooperating with the bundle diameter guide wire. Wherein, the natural straight length W0 of the wire and the circumference C of the covered stent 100 at the corresponding position of the wire in the natural expansion state satisfy the relationship: W0≤C / 4.

[0126] In combination Figures 31-33 As shown, the preset catheter 79 comprises a straight pipe segment 791 and a pre-bent segment 792, the pre-bent segment 792 is arranged at the distal end side of the straight pipe segment 791, and the connection between the straight pipe segment 791 and the pre-bent segment 792 forms a bending point, and the pre-bent angle γ of the pre-bent segment 792 relative to the straight pipe segment 791 satisfies the range: 0°<γ≤60°; wherein the pre-bent angle γ is the included angle between the straight line where the straight pipe segment 791 is located and the tangent line where the distal end point T of the large bending center of the preset catheter 79 is located. The distal end of the preset catheter 79 is provided with a developing member 793 for displaying the position of the distal end of the preset catheter 79, so as to facilitate the distal end of the preset catheter 79 to enter the branch blood vessel, and the proximal end of the preset catheter 79 extends out of the proximal end of the handle assembly 75 with a surplus, so as to facilitate the adjustment of the preset catheter 79 to enter the branch blood vessel, and also facilitate the guide wire to pass through the preset catheter 79 to directly enter the branch blood vessel.

[0127] The support rod 72 further comprises a third channel 723 for the preset catheter 79 to pass through in the axial direction, as Figure 16a shown.

[0128] As Figure 32As shown, the proximal end side of the main stent 10 includes a gap 15, at least part of the pre-bent section 792 of the pre-catheter 79 protrudes out of the proximal end side of the main stent 10, in the present embodiment, the first bare coil 20 is hooked on the rear release structure of the delivery device 70, the gap 15 is formed between each wave rod of the first bare coil 20 hooked on the rear release structure due to radial compression; in the delivery state, at least part of the pre-bent section 792 is embedded in the gap 15 to maintain the pre-bent shape of the pre-bent section, when the part of the pre-catheter 79 protruding out of the covered stent is sheathed in the sheath tube 73, the pre-bent shape of the pre-catheter 79 is prevented from being straightened due to the extrusion of the covered stent 100 and the sheath tube 73.

[0129] Another stent system 700 is used for the surgical method of aortic arch implantation, which can be combined with Figures 30-33 The delivery device is simply summarized as follows:

[0130] As Figure 34 shown, the super-hard guide wire 82 is introduced into the ascending aorta to establish an access channel of the aortic arch, and then the stent system 700 is introduced along the super-hard guide wire 82, the stent system 700 is slowly introduced into the human body along the super-hard guide wire 82 until the distal end of the stent system 700 is introduced into the descending aorta position of the aorta, as Figure 35 shown.

[0131] The sheath tube 73 is retracted to the distal end of the main stent 10 by retracting the sliding handle 752, so that the main stent 10 sheathed by the envelope 30a is exposed outside the sheath tube 73 in a state of being wrapped by the envelope 30a, since the covered stent 100 is sheathed by the envelope 30a and is radially sheathed, after the sheath tube 73 is retracted, the stent system 700 can still be adjusted along the super-hard guide wire 82, so as to accurately position the covered stent 100, and the branch stent 50 and the pre-catheter 79 are exposed after the sheath tube 73 is retracted, as Figure 36 shown.

[0132] The proximal end of the pre-catheter 79 is rotated to make the pre-bent section 792 of the pre-catheter 79 disengage from the gap 15 of the first bare coil 20, and then the pre-catheter 79 is pushed to select the pre-catheter 79 into the branch blood vessel (illustrated as the left subclavian artery), and a branch hard guide wire 83 is introduced into the branch blood vessel along the pre-catheter 79, as Figures 37-38 shown.

[0133] As Figure 39 shown, the stent system 700 is pushed forward to the annular support 13 opposite the left subclavian artery, and then the radial guide wire 741 is retracted, so that after the envelope 30a is opened, the covered stent 100 naturally expands to substantially adhere to the wall, as Figure 40 shown.

[0134] As Figure 41As shown, the first bare coil 20 is released, the preset catheter 79 and the delivery device 70 are withdrawn, an external elongated stent 90 is implanted along the branch hard guide wire 83, and the branch hard guide wire 83 is withdrawn. Figure 42 As shown.

[0135] The stent system 700 provided by the embodiment can make the preset catheter 79 more easily selected into the branch blood vessel, thereby facilitating the branch hard guide wire 83 to be selected into the branch blood vessel to establish a branch passage, can avoid the problem that the guide wire is not easy to be selected into the branch blood vessel, does not need to cut the upper limb access, can avoid the problem of guide wire entanglement, greatly reduces the operation time, and the pre-bent section 792 of the preset catheter 79 can adapt to different anatomical forms and is also applicable to anatomical forms in which the branch angle is too large to be easily selected. After the preset catheter 79 is selected into the branch blood vessel, the difficulty of selecting the branch hard guide wire 83 into the branch blood vessel can be reduced, thereby reducing the operation time.

[0136] Due to the cooperation of the envelope 30a and the preset catheter 79, when the covered stent 100 is wrapped in the envelope 30a, a narrow and relatively uniform channel in the axial direction is formed in the covered stent 100 for the preset catheter 79 to pass through. Since the channel does not need to be radially restrained by the sheath tube 73 outside the covered stent 100, the friction of the sheath tube 73 on the preset catheter 79 can be reduced, and the delivery of the preset catheter 79 is more smooth.

[0137] Meanwhile, the relationship between the width W of the envelope 30a and the lumen circumference C of the covered stent 100 at the corresponding position of the envelope 30a satisfies W≤C / 4, so that the compression radius of the covered stent in the semi-constrained state is small, that is, the radial compression degree of the covered stent is kept at a relatively large degree. On the one hand, the channel size can be slightly larger than the outer diameter of the preset catheter 79, so that the delivery of the preset catheter 79 is smooth. Even if the stacked coils of the radially compressed covered stent are crowded, the preset catheter is preset in the covered stent. Due to the soft wrapping of the envelope, a soft radial buffer can be provided to reduce the friction between the preset catheter and the stacked main coils, and the smoothness of the delivery can still be ensured when the delivery is required in the axial direction. On the other hand, the channel size can not be too large, which can limit the radial space of the preset catheter 79, so that the preset catheter 79 can not be bent in the channel during the delivery. In addition, the friction of the envelope 30a on the covered stent 100 is smaller than the compression of the sheath tube 73 on the covered stent 100, and the envelope 30a wraps the main stent 10 uniformly in the axial direction of the main stent 10. When the covered stent 100 is bundled by the wire, the channel at the position where the main coil 11 is not bundled by the wire is relatively large due to the self-expanding force of the main coil 11, and the preset catheter 79 is bent at the position where the channel space is relatively large.

[0138] It can be understood that, in order to make the radial compression degree of the envelope larger, the relationship between the width W of the envelope 30a and the lumen circumference C of the stent graft 100 at the corresponding position can also satisfy W≤C / 5; that is, even if the envelope wraps the stent graft, the channel space of the stent graft after radial compression is small, and since the envelope is a flexible film, the radial compression of the stent graft by the envelope is soft wrapping. When the pre-catheter is pre-positioned in the space in the axial direction, the pre-catheter can also smoothly slide in the axial direction along the narrow space, and at the same time, the envelope radially extrudes the stent graft, which can avoid the bending of the pre-catheter in the channel space.

[0139] It can be understood that, in one of the embodiments, the stent system 700 can also include a pre-guide wire, which is arranged in the pre-catheter 79 and extends along the axial channel of the pre-catheter 79; the distal end of the pre-guide wire is beyond the bending point of the pre-bent section 792 and the straight tube section 791, which prevents the pre-bent section 792 from being embedded in the gap 15 and keeps the bending of the pre-bent section 792, so that the passage of the bending point is narrowed, thereby causing the guide wire to be difficult to pass through the narrow passage of the bending point during the subsequent surgery process, thereby increasing the difficulty of the surgery.

[0140] In other embodiments, the stent graft 100 provided by the application can also include an embedded stent 60, so that the stent graft can be used for the case where an aneurysm involves the left common carotid artery, such as Figures 43-44 As shown, the stent graft 100 also includes another window, and the embedded stent 60 is arranged on the distal side of the branch stent 50, and the embedded stent 60 and the branch stent 50 are at least partially on the same axial line, so that when the branch stent is located in the left common carotid artery, the corresponding window of the embedded stent 60 can face the left subclavian artery.

[0141] As Figures 43-44 provided, the release process of the corresponding stent system of the stent graft is as Figures 45-50 shown, and the stent system is used for the surgical method of implanting in the aortic arch, which can be combined with Figures 30-33 The delivery device is simply summarized as follows:

[0142] The process of establishing the aortic access is as Figures 34-37The process is the same as above: the ultra-rigid guidewire 82 is inserted into the ascending aorta to establish an access channel in the aortic arch. Then, the stent system is introduced along the ultra-rigid guidewire 82. The stent system is slowly introduced into the body along the ultra-rigid guidewire 82 until the distal end of the stent system is introduced into the descending aorta. The sheath 73 is withdrawn to the distal end of the main stent 10 by withdrawing the sliding handle 752, so that the main stent 10, which is bound by the capsule 30a, is exposed outside the sheath 73 in a state of being wrapped by the capsule 30a. Since the covered stent 100 is wrapped by the capsule 30a and radially bound, the stent system can still be adjusted along the ultra-rigid guidewire 82 after the sheath 73 is withdrawn, so as to accurately position the covered stent 100. The branch stent 50 and the pre-placed catheter 79 are exposed after the sheath 73 is withdrawn.

[0143] Further, the proximal end of the pre-placed catheter 79 is rotated and slightly retracted, causing the pre-bent section 792 of the pre-placed catheter 79 to disengage from the gap 15 of the first bare wave loop 20. Then, the pre-placed catheter 79 is advanced and inserted into the left common carotid artery. A branch rigid guidewire 83 is then guided along the pre-placed catheter 79 into the branch vessel. Figure 45 As shown;

[0144] like Figure 46 As shown, the stent system is pushed forward until the annular support 13 is aligned with the left common carotid artery, and then the guidewire 741 is withdrawn, allowing the capsule 30a to open and the covered stent 100 to naturally expand to essentially adhere to the carotid wall, as shown. Figure 47 As shown;

[0145] like Figure 48 As shown, release the first bare wave coil 20, retract the pre-placed catheter 79 and delivery device 70, implant an external extension stent 90 along the branch guidewire 83, and withdraw the branch guidewire 83, as... Figure 49 As shown;

[0146] like Figure 50 As shown, an external small stent 91 is implanted along the embedded stent 60. One end of the small stent 91 partially overlaps and matches the embedded stent, so that the small stent 91 extends to the left subclavian artery.

[0147] It is understood that in other embodiments, the covered stent may also include two embedded stents, which can be used for cases where the aortic aneurysm involves the three branches of the aortic arch. The surgical procedure can be referred to the above procedure, and the branch stents can be aligned with the brachiocephalic trunk artery, which will not be described in detail here.

[0148] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0149] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A stent system, characterized by, The stent system further comprises a delivery device and a covered stent, the covered stent comprises a main stent and a covering, the main stent comprises a main wave coil and a main covering, the delivery device comprises a diameter releasable member, the diameter releasable member cooperates with the covering to realize radial compression and release of the covered stent, so that the covering releasably wraps the main stent to make the main stent radially compressed or released, the main covering covers the main wave coil, the covering is connected with the main stent through a binding wire, the main stent comprises a binding accessory, the main stent comprises a first side and a second side in the circumferential direction, the covering is connected to the first side of the main stent, the first side of the main stent is defined as the side close to the small bending side of the blood vessel, the second side of the main stent is defined as the side close to the large bending side of the blood vessel, the main stent comprises a proximal end segment, the binding accessory is arranged on the first side of the proximal end segment of the main stent, the binding accessory comprises a part of the main wave coil or a binding wire, the binding accessory extends along the main covering, the main covering comprises a first perforation and a second perforation, the first perforation and the second perforation are arranged on both sides of the extension direction of the binding accessory respectively, and the binding wire passes through the first perforation and the second perforation and crosses the binding accessory.

2. The support system of claim 1, wherein, The binding wire is connected to the wave rod or the wave crest or the wave trough of the main wave coil; Or, one of the main wave coils is connected by a steel sleeve to form a wave-shaped ring, the binding wire is connected to the main wave coil, and the binding wire is close to the edge of the steel sleeve.

3. The support system of claim 1, wherein, The main covering comprises a linear membrane, and the linear membrane is wound along the circumferential direction of the main covering; The binding wire is connected to the wave rod of the main wave coil, and the proximal end side and the distal end side of the binding wire are each provided with at least one linear membrane; Or, the binding wire is connected to the wave crest of the wave rod, and the distal end side of the binding wire is provided with at least one linear membrane; Or, the binding wire is connected to the wave trough of the wave rod, and the distal end side of the binding wire is provided with at least one linear membrane.

4. The support system of claim 1, wherein, The main covering comprises a linear membrane, and the linear membrane is wound along the circumferential direction of the main covering; the shortest distance L1 from one of the linear membranes to the edge of the first perforation in the axial direction satisfies: L1≤3mm, and / or the shortest distance L2 from one of the linear membranes to the edge of the second perforation in the axial direction satisfies: L2≤3mm.

5. The support system of claim 4, wherein, A line W1 on which a straight line connecting the hole geometric centers of the first perforation and the second perforation is located is defined, the linear membrane comprises a first linear membrane, the first linear membrane is arranged on the proximal end side of the first perforation and the second perforation, and an included angle β1 between the first linear membrane and W1 satisfies: 0°≤β1≤20°.

6. The support system of claim 5, wherein, The linear membrane further comprises a second linear membrane, the second linear membrane is arranged on the distal end side of the first perforation and the second perforation, and an included angle β2 between the second linear membrane and W1 satisfies: 0°≤β2≤20°.

7. The support system of claim 4, wherein, The covering includes a buffer, a third perforation and a fourth perforation, the buffer extends along the plane where the covering is located, the third perforation and the fourth perforation are respectively arranged on both sides of the extension direction of the buffer, the binding line passes through the first perforation and the second perforation and crosses the binding accessory, and then passes through the third perforation and the fourth perforation and crosses the buffer and is knotted.

8. The support system of claim 1, wherein, The covered stent further comprises a branch stent, and a lumen of the branch stent is in communication with a lumen of the main body stent, and the branch stent is connected to the second side of the main body stent.

9. The support system of claim 8, wherein, The proximal end section comprises a first main wave ring and a second main wave ring from the proximal end to the distal end, and the binding line comprises a first binding line and a second binding line. The first binding line is arranged on the wave rod or the wave crest or the wave trough on the first side of the first main wave ring, and the second binding line is arranged on the wave rod or the wave crest or the wave trough on the first side of the second main wave ring. Or, the main body stent comprises a curved section, the curved section is closer to the distal end than the proximal end section, the curved section comprises a third main wave ring and a fourth main wave ring from the proximal end to the distal end, the first binding line is arranged on the wave rod or the wave crest or the wave trough on the first side of the first or second main wave ring, and the second binding line is arranged on the wave rod or the wave crest or the wave trough on the first side of the third or fourth main wave ring.

10. The support system of any one of claims 1-9, wherein, The delivery device comprises a sheath core assembly, a support rod and a sheath tube, the sheath core assembly comprises an inner sheath core and an outer sheath core, the inner sheath core, the outer sheath core, the support rod and the sheath tube are sequentially sleeved from inside to outside, and the support rod is sleeved outside the sheath core assembly; the delivery device further comprises a guide head, the guide head is arranged at the distal end of the inner sheath core, and the distal end of the support rod and the proximal end of the guide head are spaced apart to form a loading space of the covered stent.

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