Branch stent and conveying system

Abstract

A branch stent comprises a skirt stent and a tubular stent, and the skirt stent is connected to the proximal end of the tubular stent; the skirt support comprises a skirt supporting framework; the skirt supporting framework comprises a supporting layer and a reinforcing layer which are connected, the supporting layer is connected with the proximal end of the tubular stent and extends outwards from the tube wall of the tubular stent, the end, away from the tubular stent, of the supporting layer is bent inwards to form the reinforcing layer, and the reinforcing layer comprises a plurality of free ends. The skirt support of the branch support is high in stability, and blood leakage at the joint of the branch support and the aortic arch is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a branch stent. Background Art

[0002] The aortic arch is the curved part of the upper part of the aorta. Three branch vessels extend from the convex side of the aortic arch, which are divided into the brachiocephalic trunk (innominate artery), the left common carotid artery and the left subclavian artery from right to left. Aortic arch lesions involving branch vessels often require the implantation of vascular stents in the aortic arch, and opening windows on the vascular stents to connect the aortic arch and the branch vessels. The branch vessels are generally small vascular stents with a diameter of about 10 mm. Such small vascular stents generally cannot be well sealed with the windows of the vascular stents at the aortic arch, resulting in the risk of internal leakage around the small stent. The incidence of this internal leakage is about 3.8%.

[0003] To solve this problem, someone designed a small double-layer bracket with a "skirt", such as Figure 1 As shown: the double-layer small stent 01 includes an outer skirt 011 and an inner stent 012, the distal end of the inner stent 012 is supported in the branch blood vessel 02, and the proximal end of the inner stent 012 extends into the aortic arch 04. The outer skirt 011 can block the gap between the double-layer small stent 01 and the vascular stent 03 in the aortic arch 04, playing a role in leak prevention. However, a small section of the inner stent 012 of the double-layer small stent 01 extends into the vascular stent 03, which will affect the blood flow of the aortic arch 04, and there is a risk of causing red blood cell rupture and hemolysis, and may also cause the risk of thrombosis. At the same time, the part of the inner stent 012 extending into the aortic arch 04 is subject to the long-term impact of the high-pressure blood flow in the aortic arch 04, and there is a risk of rupture. Summary of the invention

[0004] Based on this, it is necessary to provide a branch stent that can effectively prevent internal leakage.

[0005] The present invention provides a branch stent, comprising:

[0006] A skirt support and a tubular support, wherein the skirt support is connected to the proximal end of the tubular support;

[0007] The skirt support includes a skirt support frame; the skirt support frame includes a connected support layer and a reinforcement layer, the support layer is connected to the proximal end of the tubular support and extends outward from the tube wall of the tubular support, the support layer is bent inward away from the end of the tubular support to form the reinforcement layer, and the reinforcement layer includes multiple free ends.

[0008] The support layer comprises a plurality of first support rods distributed along the circumference of the branch support, one end of the first support rod is connected to the tubular support, and the other end is connected to two second support rods far away from each other;

[0009] The support layer is bent at the first support rod so that the support layer extends outward from the tube wall of the tubular support.

[0010] In one embodiment, the support layer further comprises a plurality of extension rods, and ends of two adjacent second support rods connected to different first support rods away from the first support rod converge and are connected to one of the extension rods;

[0011] The reinforcement layer includes a plurality of reinforcement rods, each of which is connected to an end of the extension rod away from the second support rod, and the support layer is bent at the connection between the extension rod and the reinforcement rod.

[0012] In one embodiment, the width of the connection between the extension rod and the reinforcement rod is smaller than the width of other parts of the extension rod and the reinforcement rod.

[0013] In one embodiment, two adjacent first support rods, two second support rods connected to the two first support rods, and the proximal end of the tubular support enclose a support area, and in a natural state, the projection of the reinforcing rod on the cross section of the tubular support at least partially falls within the support area.

[0014] In one embodiment, the free end of the reinforcing rod is provided with a connecting hole penetrating the reinforcing rod.

[0015] In one embodiment, the skirt bracket further includes a skirt covering, and in a natural state, the reinforcing rod at least partially abuts against the skirt covering.

[0016] In one embodiment, the skirt support further comprises a skirt covering having an inner edge and an outer edge;

[0017] The tubular stent comprises a tubular support frame and a tubular coating, wherein the tubular coating is arranged on the outer peripheral surface of the tubular support frame, and the inner edge of the skirt coating is arranged between the tubular support frame and the tubular coating.

[0018] The present invention also provides a conveying system, which includes a conveyor and the above-mentioned branch stent, the conveyor including an inner sheath core, a balloon sheath tube and a conveying sheath tube arranged from the inside to the outside, and an accommodating space for accommodating the branch stent is formed between the outer peripheral surface of the balloon sheath tube and the inner wall surface of the conveying sheath tube; the conveyor also includes a pull wire arranged in the conveying sheath tube, the pull wire is connected to the reinforcement layer and can straighten the skirt support frame under the action of external force.

[0019] In one embodiment, the conveyor further includes a push rod, the distal end surface of the push rod forms the bottom surface of the accommodating space; the push rod is provided with a first lumen and a second lumen extending along its axial direction, wherein the balloon sheath tube and the inner sheath core are inserted into the first lumen, and the pull wire is inserted into the second lumen.

[0020] The branch stent of the present invention has a tubular stent and a skirt stent. When the tubular stent is placed in the branch blood vessel, the skirt stent rests against the wall of the main blood vessel. Under the support of the skirt support frame, the skirt coating of the skirt stent is tightly attached to the wall of the main blood vessel. Since the skirt support frame also has a support layer and a reinforcement layer, the support strength of the skirt support frame is higher, which further improves the sealing effect of the skirt coating. At the same time, since the reinforcement layer is formed by the inward bending of the free end of the support layer, when the branch stent is transported, the pull wire connected to the reinforcement layer can straighten the skirt support frame and pull the branch stent as a whole into the transport sheath. When entering the branch blood vessel through the aortic arch, the tubular stent is first deployed and then the skirt stent is deployed. There is no need to re-establish access in the axillary artery, which effectively shortens the operation time and reduces harm to the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of a double-layer small stent in the prior art placed in a human body;

[0022] Figure 2 It is a front view of the branch support of the present invention;

[0023] Figure 3 A three-dimensional diagram of a tubular support frame and a skirt support frame of the present invention;

[0024] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0025] Figure 5 A bottom view of the tubular support frame and the skirt support frame of the present invention;

[0026] Figure 6 A schematic diagram of the connection between the branch support and the pull wire of the present invention;

[0027] Figure 7 for Figure 2 The enlarged view of point A in the middle;

[0028] Figure 8 It is a front view of a branch bracket in another embodiment of the present invention;

[0029] Fig. 9 for Figure 8 Enlarged view of point C in the middle;

[0030] Fig.10 This is a front view of a branch stent in another embodiment of the present invention (the reinforcing rod is in contact with the skirt coating);

[0031] Fig.11 A bottom view of a tubular support frame and a skirt support frame in other embodiments of the present invention;

[0032] Fig.12 It is a partial schematic diagram of a skirt support frame in other embodiments of the present invention;

[0033] Fig.13 A longitudinal sectional view of a conveyor of the present invention;

[0034] Fig.14 A schematic diagram of the delivery system of the present invention entering a branch blood vessel;

[0035] Fig.15 A schematic diagram of the delivery system of the present invention deploying a tubular stent;

[0036] Fig.16 It is a schematic diagram of the conveying system of the present invention unfolding the skirt support;

[0037] Fig.17 This is a schematic diagram of the completion of the release of the branch stent of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] In order to more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined herein as conventional terms in the field of interventional medicine. Specifically, the "distal end" refers to the end away from the operator during the surgical operation, and the "proximal end" refers to the end close to the operator during the surgical operation. The terms "proximal end" and "distal end" are defined herein as conventional terms in the field of interventional medicine. Specifically, the "proximal end" refers to the end of the medical device that is closer to the heart after being implanted in the human body, and the "distal end" refers to the end of the medical device that is farther away from the heart after being implanted in the human body. "Axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction.

[0041] like Figure 2 As shown, this embodiment provides a branch stent 100 , including: a skirt stent 110 and a tubular stent 120 , wherein the skirt stent 110 is connected to the proximal end of the tubular stent 120 .

[0042] The skirt support 110 includes a skirt support frame 111 and a skirt coating 112, wherein the skirt coating 112 is connected to the distal end of the skirt support frame 111; in some embodiments, the skirt support does not include a skirt coating, and the skirt support frame is a dense mesh support. Figure 2 and Figure 3 The skirt support skeleton 111 includes a support layer 1111 and a reinforcement layer 1112. The support layer 1111 is connected to the proximal end of the tubular support 120 and extends outward from the tube wall of the tubular support 120. The free end of the support layer 1111 is bent inward to form the reinforcement layer 1112, and the reinforcement layer 1112 includes multiple free ends; the tubular support 120 includes a tubular support skeleton 121 and a tubular coating 122; the skirt support skeleton 111 and the tubular support skeleton 121 are made of a cut mesh tube.

[0043] The branch stent 100 of the present invention has a tubular stent 120 and a skirt stent 110. When the tubular stent 120 is placed in the branch blood vessel, the skirt stent 110 is against the wall of the main blood vessel. Under the support of the skirt support skeleton 111, the skirt coating 112 of the skirt stent 110 is in close contact with the wall of the main blood vessel. Since the skirt support skeleton 111 also has a support layer 1111 and a reinforcement layer 1112, the support strength of the skirt support skeleton 111 is higher, further improving the sealing effect of the skirt coating 112. At the same time, since the reinforcement layer 1112 is formed by bending the free end of the support layer 1111 inward, when the branch stent 100 is transported, the pull line connected to the reinforcement layer 1112 can straighten the skirt support skeleton 111 and pull the branch stent 100 as a whole into the transport sheath. During the access, the branch vessels are entered through the aortic arch, the tubular stent 120 is first deployed and then the skirt stent 110 is deployed, and there is no need to re-establish access in the axillary artery, which effectively shortens the operation time and reduces the harm to the patient.

[0044] The skirt support frame 111 and the tubular support frame 121 are integrally formed using a cut mesh tube, which is beneficial for improving the stability of the branch stent 100 during transportation and after blood vessel deployment.

[0045] like Figure 2 As shown, a developing member 130 is provided at the connection between the tubular support 120 and the skirt support 110, and the developing member 130 is used to align the opening of the branch blood vessel during the operation. The developing member 130 is made of a radiopaque material, such as tantalum, platinum-iridium alloy, gold, etc.

[0046] like Figure 4 and Figure 5 As shown, the support layer 1111 includes a plurality of first support rods 1113 distributed along the circumference of the branch support 100, one end of the first support rod 1113 is connected to the tubular support 120, and the other end is connected to two second support rods 1114 that are far away from each other; the support layer 1111 is bent at the first support rod 1113 so that the support layer 1111 extends outward from the tube wall of the tubular support 120.

[0047] The supporting layer 1111 also includes a plurality of extension rods 1115, and two adjacent second support rods 1114 connected to different first support rods 1113 converge and are connected to the extension rod 1115 at their ends away from the first support rod 1113; the reinforcing layer 1111 includes a plurality of reinforcing rods 1116, and each of the reinforcing rods 1116 is connected to one end of the extension rod 1115 away from the second support rod 1114, and the supporting layer 1111 is bent at the connection between the extension rod 1115 and the reinforcing rod 1116.

[0048] Two second support rods 1114 that are far away from each other extend from the same first support rod 1113, and two adjacent second support rods 1114 that are emitted from different first support rods 1113 converge at one end away from the first support rod 1113, so that the support layer 1111 forms a plane with multiple grids that can provide stable support, thereby improving the stability and supporting force of the skirt bracket 110. At the same time, the convergence of two adjacent second support rods 1114 reduces the number of reinforcing rods 1116 connected to the support layer 1111, making it easier for the reinforcing rods 1116 to gather together and thus facilitate the branch bracket 100 to enter the delivery sheath. Further, as Figure 6 As shown, when the branch stent 100 is straightened and enters the delivery sheath, the second support rod 1114 and the extension rod 1115 and the reinforcing rod 1116 form a "Y"-shaped structure, and the skirt support frame 111 subjected to tension is spindle-shaped as a whole, which is conducive to the retraction of the two adjacent second support rods 1114 and reduces the resistance of the branch stent 100 to entering the sheath.

[0049] The skirt support frame 111 and the tubular support frame 121 are made of a cutting mesh tube, which can be made of a memory metal tube by laser cutting, such as a nickel-titanium alloy tube. In the heat setting stage of the cutting mesh tube, the support layer 1111 is first bent outward as a whole at the first support rod 1113, so that the support layer 1111 extends outward roughly along the radial direction of the tubular support frame 121, and then the reinforcing rod 1116 is bent inward at the connection between the reinforcing rod 1116 and the extension rod 1115, so as to form the skirt support frame 111 with the support layer 1111 and the reinforcing layer 1112.

[0050] Replay Figure 4, the width of the connection 1119 between the extension rod 1115 and the reinforcing rod 1116 is smaller than the width of the extension rod 1115 and the reinforcing rod 1116. In the process of conveying the branch stent 100, the skirt support skeleton 111 is straightened. When the branch stent 100 is conveyed to the preset position and released, the skirt support skeleton 111 will return to the natural state, and the connection 1119 between the extension rod 1115 and the reinforcing rod 1116 will bend. In order to prevent the reinforcing rod 1116 from being unable to rebound to the proximal end side of the support layer 111 after the release is completed, the connection 1119 between the extension rod 1115 and the reinforcing rod 1116 is thinned, so that the connection 1119 between the extension rod 1115 and the reinforcing rod 1116 is easier to bend. In this embodiment, the width of the connection 1119 between the extension rod 1115 and the reinforcing rod 1116 refers to the width in the circumferential direction of the branch stent 100. In other embodiments, the width of the connection between the extension rod and the reinforcement rod may also refer to the width in the radial direction of the branch support.

[0051] like Figure 5 As shown, two adjacent first support rods 1113, two second support rods 1114 connected to the two first support rods 1113, and the proximal end of the tubular stent 120 enclose a support area 1117, and the projection of the reinforcing rod 1116 on the cross section of the tubular stent 120 at least partially falls within the support area 1117. On the cross section of the tubular stent 120, the reinforcing rod 1116 extends into the support area 1117, and when the branch stent 100 is released in the branch blood vessel and pulled away from the aortic arch, the reinforcing rod 1116 can strengthen the stability of the support area 1117, thereby improving the overall stability of the branch stent 100.

[0052] like Figure 5 As shown, the free end of the reinforcing rod 1116 is provided with a connecting hole 1118 that penetrates the reinforcing rod 1116. The connecting hole 1118 can be used as a connecting structure, such as Figure 6 As shown, when the branch stent 100 is transported, the pull wire 210 of the transporter passes through the plurality of connection holes 1118, so that the pull wire 210 can straighten the support layer 1111 and the reinforcement layer 1112. Each reinforcement rod 1116 is separated from each other. As the pull wire 210 is tightened, the proximal ends of the plurality of reinforcement rods 1116 approach each other, so that the skirt support frame 111 subjected to tension is shaped as a spindle as a whole, which facilitates the sheathing of the branch stent 100. In this embodiment, the skirt support frame includes 8 reinforcement rods 1116 ( Figure 6It is only used as a structural illustration, and not all the reinforcing rods are drawn. In other embodiments, the number of the reinforcing rods 1116 can be adaptively changed according to the size of the branch bracket 10. Figure 7 As shown, the skirt coating 112 has an inner edge 1121 and an outer edge 1122, and the inner edge 1121 is connected to the inner side of the tubular coating 122. After the branch stent 100 is implanted into the branch vessel, arterial blood from the aortic arch continuously flows into the branch vessel, so the inner edge 1121 of the skirt coating 112 extends into the tubular coating 122, which can prevent blood from leaking at the connection between the tubular stent 120 and the skirt stent 110. The tubular coating 122 and the skirt coating 112 are fixedly connected at the overlap by suturing, bonding or hot melting, which can effectively prevent blood from leaking. The tubular covering 122 is made of polytetrafluoroethylene film (PTFE), the skirt covering 112 is made of polyester film (PET), the tubular covering 122 and the skirt covering 112 are fixedly connected by suturing, and the use of PET to make the skirt covering 112 can also accelerate the endothelialization process of the skirt stent 110. Alternatively, the tubular covering 122 and the skirt covering 112 are both made of PTFE, and the tubular covering 122 and the skirt covering 112 are fixedly connected by hot pressing.

[0053] In some embodiments, Figure 8 and Fig. 9 As shown, a recessed structure 1110 is provided on the support layer 1111, and the recessed structure 1110 is recessed toward the proximal end of the branch stent 100. Specifically, the recessed structure 1110 is provided on the first support rod 1113, or is provided on the first support rod 1113 and extends to the second support rod 1114. And the recessed structure 1110 is close to the connection between the first support rod 1113 and the tubular support skeleton 121. When the branch stent 100 is placed in the branch blood vessel, the arterial blood with a faster flow rate flows from the proximal end of the branch stent 100 to the distal end of the branch stent, and the branch stent 100 has a tendency to move away from the main stent of the aortic arch. When the tubular stent 120 moves away from the aortic arch, the recessed structure 1110 is deformed under the pulling action of the tubular stent 120, so that various parts of the support layer 1111 still remain close to the inner side of the aortic arch main stent, especially the edge of the support layer 1111 remains close to the inner side of the aortic arch main stent, further avoiding blood leakage.

[0054] In some embodiments, Fig.10As shown, the reinforcing rod 1116 at least partially abuts against the skirt coating 112. As the bending degree of the connection 1119 between the extension rod 1115 and the reinforcing rod 1116 increases, the reinforcing rod 1116 gradually approaches the support layer 1111 or even crosses the support layer 1111. When the reinforcing rod 1116 is partially flush with the support layer 1111, the reinforcing rod 1116 and the support layer 1111 simultaneously abut against the skirt coating 112, so that the skirt coating 112 is better attached to the inner wall of the aortic arch after the branch stent 100 is released. Therefore, in some embodiments, in a natural state, the reinforcing rod 1116 at least partially abuts against the skirt coating 112.

[0055] In some embodiments, Fig.11 As shown, in the natural state, the reinforcing rod 1116 at least partially abuts against the skirt coating 112, and the projection of the reinforcing rod 1116 on the cross section of the tubular stent 120 at least partially falls between the projections of two adjacent extension rods 1115 on the cross section of the tubular stent 120, and one of the two adjacent extension rods 1115 is connected to the reinforcing rod 1116. Specifically, the reinforcing rod 1116 rotates around the connection between the reinforcing rod 1116 and the extension rod 1115, and is shaped during the heat setting treatment stage of the branch stent 100. Therefore, when the skirt stent 110 is unfolded, the reinforcing rod 1116 has a supporting effect on the skirt coating 122, forming a complete support in the circumferential direction of the skirt stent 110, and preventing the skirt coating 122 located between the two adjacent extension rods 1115 from separating from the aortic arch main body stent.

[0056] In some embodiments, Fig.12 As shown, in the natural state, the free end of the reinforcing rod 1116 abuts against the second supporting rod 1114, so that the second supporting rod 1114, the extension rod 1115, and the reinforcing rod 1116 enclose a through hole 113. Since the skirt support frame 111 is formed by cutting a metal tube, its edge can cut a thrombus, and the through hole 113 can cut or intercept a blood vessel flowing through the branch stent 100, preventing a larger thrombus from continuing to flow into a lower-level blood vessel.

[0057] This embodiment also provides a conveying system, which includes a conveyor 200 and the branch support 100 described above. Fig.13As shown, the conveyor 200 includes an inner sheath core 220, a balloon sheath tube 230 and a delivery sheath tube 240 arranged from the inside to the outside, and a receiving space 250 for receiving the branch stent 100 is formed between the outer peripheral surface of the balloon sheath tube 230 and the inner wall surface of the delivery sheath tube 240; the conveyor 200 also includes a pull wire 210 ( Fig.13 The pull wire 210 is not shown in the figure. The pull wire 210 is connected to the reinforcement layer 1112 of the branch bracket 100 and can straighten the skirt support frame 111 under the action of external force.

[0058] Before the branch stent 100 is released, the restraint line pre-set on the branch stent 100 puts the branch stent 100 in a compressed state. The balloon sheath tube 230 is located inside the branch stent 100. When the branch stent 100 reaches the preset release position, the balloon 231 on the balloon sheath tube 230 is filled to expand the branch stent 100, and the restraint line is broken at the same time. The restraint line is made of a human body absorbable material, such as polyurethane, polylactic acid, polycaprolactone, etc.

[0059] The conveyor 200 further includes a push rod 260, which is disposed in the conveying sheath tube 240, and the distal end surface of the push rod 260 forms the bottom surface of the accommodating space 250. The push rod 260 is provided with a first lumen 261 and a second lumen 262 extending along its axial direction, wherein the balloon sheath tube 230 and the inner sheath core 220 are inserted into the second lumen 262, and the pull wire 210 is inserted into the first lumen 261. The pull wire 210, the balloon sheath tube 230, and the inner sheath core 220 are respectively inserted into the independent first lumen 261 and the second lumen 262, which can effectively prevent the pull wire 210 from being entangled with the balloon sheath tube 230 or the inner sheath core 220 during movement.

[0060] The process of the delivery system of this embodiment delivering or releasing the branch stent 100 is as follows:

[0061] 1. As Fig.14 As shown, the delivery device 200 enters the branch vessel 02 through the aortic arch 04 and the window of the vascular stent 03, and the delivery sheath is withdrawn until the tubular stent 120 is completely exposed from the delivery sheath 240, and the skirt stent 110 is at least partially still in the delivery sheath 240. The position of the branch stent 100 is adjusted so that the developing member 130 at the connection between the tubular stent 120 and the skirt stent 110 is aligned with the opening of the branch vessel 02.

[0062] 2. If Fig.15 As shown, the balloon 231 is inflated to expand the tubular stent 120 and the binding wire 270 is broken.

[0063] 3. Such as Fig.16 As shown, the balloon 231 is deflated and withdrawn, the delivery sheath 240 is withdrawn to allow the skirt stent 110 to be completely exposed outside the delivery sheath 240 , and the pull wire 210 is withdrawn to release the skirt stent 110 .

[0064] 4. Such as Fig.17 As shown, the conveyor 200 is withdrawn to complete the release of the branch stent 100 .

[0065] It should be noted that, for the convenience of observation and understanding, Figures 14 to 16 The vascular stent 03 is partially made transparent; the structure inside the delivery sheath 240 is simplified, and only the pull wire 210 is retained.

[0066] Since the branch stent 100 may be stretched to a certain extent when it is pulled into the delivery sheath during loading, during the above-mentioned release process, the branch stent 100 will be shortened to a certain extent after being released from the delivery sheath 240. The occurrence of shortening will cause the release position of the branch stent 100 to be inaccurate. Since the branch stent 100 in this embodiment is still compressed by the binding line 270 after being released from the delivery sheath 240, the expansion force of the branch stent 100 itself is not enough to break the binding line. Therefore, the branch stent 100 can be completely released after the position of the branch stent 100 is adjusted, so that the release position of the branch stent 100 is more accurate.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A branch bracket, characterized in that: include: A skirt support and a tubular support, wherein the skirt support is connected to the proximal end of the tubular support; The skirt support includes a skirt support frame; the skirt support frame includes a connected support layer and a reinforcement layer, the support layer is connected to the proximal end of the tubular support and extends outward from the tube wall of the tubular support, the support layer is bent inward away from the end of the tubular support to form the reinforcement layer, and the reinforcement layer includes multiple free ends.

2. The branch bracket according to claim 1, characterized in that: The support layer comprises a plurality of first support rods distributed along the circumference of the branch support, one end of the first support rod is connected to the tubular support, and the other end is connected to two second support rods far away from each other; The support layer is bent at the first support rod so that the support layer extends outward from the tube wall of the tubular support.

3. The branch bracket according to claim 2, characterized in that: The support layer further comprises a plurality of extension rods, wherein two adjacent second support rods connected to different first support rods have ends away from the first support rods converging and connected to one of the extension rods; The reinforcement layer includes a plurality of reinforcement rods, each of which is connected to an end of the extension rod away from the second support rod, and the support layer is bent at the connection between the extension rod and the reinforcement rod.

4. The branch bracket according to claim 3, characterized in that: The width of the connection between the extension rod and the reinforcement rod is smaller than the width of other parts of the extension rod and the reinforcement rod.

5. The branch bracket according to claim 3, characterized in that: Two adjacent first support rods, two second support rods connected to the two first support rods and the proximal end of the tubular support enclose a support area. In a natural state, the projection of the reinforcing rod on the cross section of the tubular support at least partially falls within the support area.

6. The branch bracket according to claim 3, characterized in that: The free end of the reinforcing rod is provided with a connecting hole penetrating through the reinforcing rod.

7. The branch bracket according to claim 3, characterized in that: The skirt bracket also includes a skirt covering, and in a natural state, the reinforcing rod at least partially abuts against the skirt covering.

8. The branch bracket according to claim 1, characterized in that: The skirt support also includes a skirt covering having an inner edge and an outer edge; The tubular stent comprises a tubular support frame and a tubular coating, wherein the tubular coating is arranged on the outer peripheral surface of the tubular support frame, and the inner edge of the skirt coating is arranged between the tubular support frame and the tubular coating.

9. A conveying system, characterized in that: It includes the branch stent described in claims 1-8; the conveying system also includes a conveyor, the conveyor includes an inner sheath core, a balloon sheath tube and a conveying sheath tube arranged from the inside to the outside, and an accommodating space for accommodating the branch stent is formed between the outer peripheral surface of the balloon sheath tube and the inner wall surface of the conveying sheath tube; the conveyor also includes a pull wire arranged in the conveying sheath tube, the pull wire is connected to the reinforcement layer and can straighten the skirt support frame under the action of external force.

10. The conveying system according to claim 9, characterized in that The conveyor also includes a push rod, the distal end surface of which forms the bottom surface of the accommodating space; the push rod is provided with a first lumen and a second lumen extending along its axial direction, wherein the balloon sheath tube and the inner sheath core are inserted into the first lumen, and the pull wire is inserted into the second lumen.

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