A bridging stent

Abstract

The application provides a bridging stent, which comprises a clamping stent and a tubular stent, the clamping stent surrounds the tubular stent; the clamping stent comprises a clamping framework, the clamping framework comprises a plurality of clamping portions and a first connecting portion, the plurality of clamping portions are arranged along the circumferential direction of the clamping framework, and the first connecting portion is used for connecting the clamping portions and the tubular stent; in a delivery state, the clamping portions are located on the proximal side of the first connecting portion; in a natural state, the clamping portions are located on the distal side of the first connecting portion, and the clamping portions clamp the tubular stent. The clamping portions are used for clamping an autologous blood vessel between the tubular stent and the clamping portions, so that the bridging stent does not need to be sutured when being connected with the autologous blood vessel, the operation time is reduced, and the operation difficulty and risk are reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to a bridging stent. Background Technology

[0002] Aortic dissection is an acute aortic disease characterized by rapid onset, rapid progression, high mortality, difficult surgery, and poor prognosis. The pathophysiology of aortic dissection involves rupture of the aortic intima, allowing blood to rush into the aortic media, leading to the formation of a true and false lumen. Currently, patients with Stanford type A aortic dissection, involving the entire aorta (including the ascending aorta, aortic arch, descending aorta, and abdominal aorta), are generally treated with aortic arch replacement surgery. The aortic arch connects to three branch vessels: the left subclavian artery, the left common carotid artery, and the brachiocephalic artery. These three branches ensure normal blood supply to the upper limbs and brain. Figure 1 As shown, aortic arch replacement surgery requires severing the connection between the aortic arch 01 and its branch vessel 02, and using cardiopulmonary bypass to maintain blood supply to the upper limbs and brain. Figure 2 As shown, after implanting the bridging stent 03, the surgeon aligns the cut surfaces of the patient's branch vessel 02 and the bridging stent 03 before connecting them. The challenge of the surgery lies in ensuring the successful connection of the bridging stent's branch stent 031 to its corresponding branch vessel 02, preventing displacement or slippage during and after the procedure. If a branch in the bridging stent shifts or detaches from the branch vessel, it can lead to serious consequences. In some surgeries, all three branches of the aortic arch must be severed before being connected to the bridging stent. Currently, the branches of the bridging stent are mainly connected to their corresponding branch vessels via manual suturing or with the aid of connectors such as bracing. These methods require a high level of surgical skill and a long surgical time. Prolonged dislocation of the branch vessels increases the probability of brain, internal organ, and limb damage. Summary of the Invention

[0003] Therefore, it is necessary to provide a bridging bracket that enables rapid connection.

[0004] This invention provides a bridging bracket, comprising:

[0005] A clamping bracket and a tubular bracket, the clamping bracket surrounding the tubular bracket;

[0006] The clamping bracket includes a clamping frame, which includes multiple clamping parts and multiple first connecting parts. The multiple clamping parts are arranged along the circumferential direction of the clamping frame, and the first connecting parts are used to connect the clamping parts and the tubular bracket.

[0007] In the conveying state, the clamping part is located on the proximal side of the first connecting part;

[0008] In its natural state, the clamping part is located on the distal side of the first connecting part, and the clamping part clamps the tubular support.

[0009] In one embodiment, a first connecting portion is connected between two adjacent clamping portions.

[0010] In one embodiment, the first connecting portion includes an arc-shaped structure, the two ends of which are respectively connected to two adjacent clamping portions; the arc-shaped structure is provided with at least one first connecting point, and the arc-shaped structure is fixedly connected to the tubular support at the first connecting point;

[0011] In its natural state, the opening of the arc-shaped structure faces the distal end of the bridging bracket, and the first connection point is located between the proximal apex of the arc-shaped structure and the distal end of the arc-shaped structure.

[0012] In one embodiment, the arc-shaped structure is further provided with a second connection point, which is located at the near-end vertex of the arc-shaped structure; the arc-shaped structure is fixedly connected to the tubular support at the second connection point.

[0013] In one embodiment, the clamping frame further includes a plurality of support portions, a plurality of second connecting portions, and a plurality of third connecting portions. The plurality of support portions are arranged along the circumferential direction of the tubular support and are all fixedly connected to the tubular support. A second connecting portion is connected between two adjacent support portions. The third connecting portion is connected between the first connecting portion and the second connecting portion.

[0014] In the conveying state, the clamping part is located on the proximal side of the support part;

[0015] In its natural state, the third connecting part is bent, the clamping part is located outside the support part, and the number and position of the plurality of clamping parts correspond one-to-one with the plurality of support parts.

[0016] In one embodiment, the tubular support includes a tubular skeleton, the tubular skeleton and the clamping skeleton being formed by cutting a metal tube.

[0017] In one embodiment, the clamping part has a first segment and a second segment, one end of the first segment is connected to the tubular support, and the other end is connected to the second segment; there is an angle α between the first segment and the outer surface of the tubular support, and an angle β between the second segment and the first segment, wherein α is less than or equal to 90 degrees, and β is greater than 90 degrees and less than 180 degrees.

[0018] In one embodiment, a plurality of clamping portions are respectively provided with grooves, and in the natural state, the grooves are recessed from the outer surface of the clamping portion to the inner side of the tubular support;

[0019] The axial distance between the groove closest to the proximal end of the bridging bracket and the groove closest to the distal end of the bridging bracket is D, and the axial length of the shortest clamping part among the plurality of clamping parts is L, and D is less than or equal to 1 / 3L.

[0020] In one embodiment, a protrusion is provided at the end of the clamping portion away from the first connecting portion, and in its natural state, the protrusion protrudes toward the tubular support.

[0021] In one embodiment, an elastic element is connected between two adjacent clamping portions.

[0022] The bridging stent of the present invention is used to connect a patient's autologous blood vessels. When the bridging stent is in the delivery state, the clamping portion of the clamping stent is located on the proximal side of the connecting portion, wherein the portion of the tubular stent located on the distal side of the connecting portion is placed within the autologous blood vessel. When the bridging stent is in the inert state, the clamping portion of the clamping stent flips to the distal side of the connecting portion, so that the clamping portion can cover the outer surface of the autologous blood vessel, i.e., the autologous blood vessel is clamped between the tubular stent and the clamping portion to complete the connection between the autologous blood vessel and the bridging stent. The bridging stent of the present invention does not require sutures when connecting to the autologous blood vessel, reducing surgical time and lowering the difficulty and risk of the surgery. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of branch vessel dissection during a conventional aortic arch replacement surgery.

[0024] Figure 2 This is a schematic diagram of the suturing of branch vessels to the intraoperative stent during a conventional aortic arch replacement surgery.

[0025] Figure 3 This is a front view of the bridging bracket in its natural state according to Embodiment 1 of the present invention;

[0026] Figure 4 This is a perspective view of the clamping skeleton in its natural state in Embodiment 1 of the present invention;

[0027] Figure 5 This is a schematic diagram of the connection between the bridging stent and the autologous blood vessel when the stent is in the delivery state in Embodiment 1 of the present invention (the autologous blood vessel is transparent).

[0028] Figure 6 This is a schematic diagram of the connection between the bridging stent and the autologous blood vessel in the natural state in Embodiment 1 of the present invention (the autologous blood vessel has been made transparent);

[0029] Figure 7 This is a schematic diagram of the connection between the bridging stent and the autologous blood vessel in the natural state in Embodiment 1 of the present invention;

[0030] Figure 8 for Figure 3 Enlarged view of point A in the middle;

[0031] Figure 9 This is a partially enlarged view of the clamping portion (which has a first segment and a second segment) in another embodiment of the present invention;

[0032] Figure 10 This is a partial enlarged view of the clamping part (the clamping part has a groove) in another embodiment of the present invention;

[0033] Figure 11 This is a partially enlarged view of the clamping part (the clamping part has a protrusion) in another embodiment of the present invention;

[0034] Figure 12 This is a front view of the clamping skeleton in its natural state in Embodiment 2 of the present invention;

[0035] Figure 13 This is a front view of the bridging bracket in its natural state in Embodiment 2 of the present invention;

[0036] Figure 14 This is a front view of the clamping frame in the conveying state in Embodiment 2 of the present invention;

[0037] Figure 15 This is a schematic diagram of the bridging stent in Embodiment 2 of the present invention being connected to an autologous blood vessel when it is in the delivery state (the autologous blood vessel is transparent).

[0038] Figure 16 This is a schematic diagram of the connection between the bridging stent and the autologous blood vessel in the natural state in Embodiment 2 of the present invention (the autologous blood vessel has been made transparent);

[0039] Figure 17 This is a schematic diagram of the connection between the bridging stent and the autologous blood vessel in the natural state in Embodiment 2 of the present invention;

[0040] Figure 18 This is a front view of the bridging bracket in its natural state in Embodiment 3 of the present invention;

[0041] Figure 19 This is a front view of the bridging bracket in its natural state according to another embodiment of the present invention;

[0042] Figure 20 This is a front view of the bridging bracket in its natural state in Embodiment 4 of the present invention;

[0043] Figure 21 This is a schematic diagram of the bridging stent in Embodiment 4 of the present invention being connected to an autologous blood vessel when it is in the delivery state (the autologous blood vessel is transparent).

[0044] Figure 22 This is a top view of the bridging support in Embodiment 4 of the present invention during the transition between the conveying state and the natural state;

[0045] Figure 23 This is a schematic diagram of the connection between the bridging stent and the autologous blood vessel in the natural state in Embodiment 4 of the present invention (the autologous blood vessel has been made transparent).

[0046] Figure 24 This is a schematic diagram of the connection between the bridging stent and the autologous blood vessel in the natural state in Embodiment 4 of the present invention.

[0047] Figure 25 This is a front view of the bridging bracket in its natural state in Embodiment 5 of the present invention; Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the operator during the surgical procedure, and "proximal" refers to the end closest to the operator during the surgical procedure. The terms "proximal" and "distal" are also used herein as conventional terms in the field of interventional medicine. Specifically, "proximal" refers to the end of the medical device implanted in the human body closer to the heart, and "distal" refers to the end of the medical device implanted in the human body further away from the heart. "Axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction.

[0051] Example 1

[0052] like Figure 3As shown, this embodiment provides a bridging bracket 100, which includes a tubular bracket 110 and a clamping bracket 120, wherein the clamping bracket 120 is arranged around the tubular bracket 110.

[0053] The clamping bracket 120 includes a clamping frame 121, such as Figure 4 As shown, the clamping frame 121 includes a plurality of clamping portions 1211 and a first connecting portion 1212. The plurality of clamping portions 1211 are arranged along the circumferential direction of the clamping frame 121, and the first connecting portion 1212 is used to connect the clamping portions 1211 and the tubular support 110. The clamping frame 121 is made of shape memory alloy, such as nickel-titanium alloy. In this embodiment, the clamping support 120 further includes a clamping coating (not shown in the figure). In other embodiments, the clamping support 120 may not include a clamping coating.

[0054] In the conveying state, the clamping part 1211 is located on the proximal side of the first connecting part 1212.

[0055] In its natural state, the clamping part 1211 is located at the distal end of the first connecting part 1212, and the clamping part 1211 clamps the tubular support 110.

[0056] The bridging stent 100 of the present invention is used to connect the patient's autologous blood vessel 1. The portion of the tubular stent 110 located on the distal side of the first connecting portion 1212 is used to be inserted into the autologous blood vessel 1. After the tubular stent 110 is unfolded, it is anchored to the autologous blood vessel 1. The clamping stent 120 is used to clamp the autologous blood vessel 1 to further fix the autologous blood vessel 1 and the bridging stent 100.

[0057] like Figure 5 As shown, the clamping stent 120 can be flipped towards the proximal side of the first connecting portion 1212 under the action of external force, and maintained in a delivery state under the restraint of a binding line or sheath. In the delivery state, the clamping portion 1211 of the clamping stent 120 is located on the proximal side of the first connecting portion 1212. When it is necessary to connect the autologous blood vessel 1, the portion of the tubular stent 110 located on the distal side of the first connecting portion 1212 is placed inside the autologous blood vessel 1. Figure 6 and Figure 7As shown, when the sheath or restraint suture on the bridging stent 100 is removed, i.e., when the bridging stent 100 is in its natural state, the clamping portion 1211 of the clamping stent 120 flips to the distal end of the first connecting portion 1212, so that the clamping portion 1211 can cover the outer surface of the autologous blood vessel 1, i.e., the autologous blood vessel 1 is clamped between the tubular stent 110 and the clamping portion 1211, thereby completing the connection between the autologous blood vessel 1 and the bridging stent 100. The bridging stent 100 of the present invention does not require sutures when connected to the autologous blood vessel 1, reducing surgical time and lowering the difficulty and risk of the surgery.

[0058] In this embodiment, looking back Figure 4 A first connecting part 1212 is connected between two adjacent clamping parts 1211. The clamping frame 121 is generally ring-shaped, and the first connecting part 1212 is connected to the tubular support 110 by stitching or gluing.

[0059] like Figure 8 As shown, the first connecting portion 1212 includes an arc-shaped structure 12121, the two ends of which are respectively connected to two adjacent clamping portions 1211; the arc-shaped structure 12121 is provided with at least one first connection point 12122, and the arc-shaped structure 12121 is fixedly connected to the tubular support 110 at the first connection point 12122; in its natural state, such as Figure 8 As shown, the opening of the arcuate structure 12121 faces the distal end of the bridging bracket 100, and the first connection point 12122 is located between the proximal apex and the distal end of the arcuate structure 12121. In this embodiment, the connection portion 1212 and the tubular bracket 110 are connected at the first connection point 12122 by a suture. In other embodiments, the first connection portion and the tubular bracket are bonded together at the first connection point.

[0060] In this embodiment, when the clamping part 1211 is flipped from the distal end of the first connecting part 1212 to the proximal end of the first connecting part 1212 under the action of an external force (e.g., an operator flips the clamping part to the proximal end of the first connecting part 1212), the clamping part 1211 flips around the first connection point 12122 closest to the clamping part 1212. The portion from the proximal vertex of the arc-shaped structure 12121 to the first connection point 12122 closest to the clamping part 1212 (e.g.) Figure 8The tubular stent 110 is compressed inward by the M portion shown. When the bridging stent 100 is released, under the expansion force of the tubular stent 110 itself and the pulling force of the suture, the clamping portion 1211 flips around the first connection point 12122 closest to the clamping portion 1212 to the distal end of the first connection point 12122. It can be understood that the closer the first connection point 12122 is to the clamping portion 1211, the more the proximal apex of the arcuate structure 12121 to the first connection point 12122 closest to the clamping portion 1212 (e.g., ...). Figure 8 The longer the M portion (shown), the greater the compression of the connecting portion 1212 on the tubular support 110, and the greater the traction of the suture. Especially when the connection point is located on the clamping portion 1211, the clamping portion 1211 is difficult to flip. Therefore, the first connection point 12122 is located between the proximal apex of the arc-shaped structure 12121 and the end of the arc-shaped structure 12121. When the connecting portion 1212 flips, the compression of the tubular support 110 is moderate, and the traction of the suture is moderate, effectively preventing the clamping portion 1211 from being difficult to flip to the proximal side of the connecting portion 1212, while ensuring that the clamping portion 1211 can spring back to the distal side of the connecting portion 1212 when unfolded.

[0061] The arc-shaped structure 12121 is further provided with a second connection point 12123, which is located at the near-end vertex of the arc-shaped structure 12121. The arc-shaped structure 12121 is fixedly connected to the tubular support 110 at the second connection point 12123. The second connection point 12123 further strengthens the connection between the clamping support 120 and the tubular support 110 without affecting the rotation of the clamping support 120.

[0062] like Figure 9 As shown, in some embodiments, the clamping portion 1211 has a first segment 12111 and a second segment 12112. One end of the first segment 12111 is connected to the tubular stent 110 via the first connecting portion 1212, and the other end is connected to the second segment 12112. An angle α is formed between the first segment 12111 and the outer surface of the tubular stent 110, and an angle β is formed between the second segment 12112 and the first segment 12111. α is less than or equal to 90 degrees, and β is greater than 90 degrees and less than 180 degrees. Therefore, when the bridging stent 100 is in its natural state, there is a space between the clamping portion 1211 and the outer surface of the tubular stent 110 to accommodate the autologous blood vessel 1. Furthermore, the second segment 12112 of the clamping portion 1211 gradually approaches the tubular stent 110 from the proximal end to the distal end of the bridging stent 100, which helps to enhance the compression of the autologous blood vessel 1 by the clamping portion 1211.

[0063] like Figure 10 As shown, in some embodiments, each of the plurality of clamping portions 1211 is provided with a groove 12113. In its natural state, the groove 12113 is recessed from the outer surface of the clamping portion 1211 towards the inner side of the tubular stent 110. When the bridging stent 100 is fully deployed and the clamping portion 1211 clamps the autologous blood vessel 1, to further enhance the fixing effect of the clamping portion 1211 on the autologous blood vessel 1, one or more binding lines (not shown in the figures) can be selectively tied around the clamping portion 1211. The groove 12113 is used to accommodate the binding line and prevent the binding line from moving along the axial direction of the bridging stent 100. The axial distance between the groove 12113 closest to the proximal end of the bridging stent 100 and the groove 12113 closest to the distal end of the bridging stent 100 is D. The axial length of the shortest clamping portion among the plurality of clamping portions 1211 is L, and D is less than or equal to 1 / 3L. That is, the multiple grooves 12113 can be located at different axial positions. As long as the distance deviation of the grooves 12113 in the axial direction meets the above range, the effect of restricting the movement of the binding line can be achieved.

[0064] like Figure 11 As shown, in some embodiments, a protrusion 12114 is provided at the end of the clamping portion 1211 away from the first connecting portion 1212. In its natural state, the protrusion 12114 protrudes toward the tubular stent 110. When the autologous blood vessel is pressed between the clamping portion 1211 and the tubular stent 110, the protrusion 12114 protruding toward the tubular stent 110 can further press the autologous blood vessel, which helps to enhance the fixing effect of the clamping portion 1211 on the autologous blood vessel.

[0065] Example 2

[0066] The bridging bracket 200 of Embodiment 2 has a basically the same structure as the bridging bracket 100 of Embodiment 1, the main difference being the structure of the clamping frame 221. For example... Figure 12 As shown, the clamping frame 221 includes multiple clamping parts 2211, multiple first connecting parts 2212, multiple supporting parts 2213, multiple second connecting parts 2214, and multiple third connecting parts 2215. Figure 13As shown, the plurality of clamping parts 2211 and the plurality of supporting parts 2213 are arranged along the circumferential direction of the clamping frame 221. The supporting parts 2213 and the second connecting parts 2214 are both fixedly connected to the tubular bracket 210. The third connecting part 2215 connects the second connecting part 2214 and the first connecting part 2212. That is, the first connecting part 2212 is connected to the tubular bracket 210 through the supporting parts 2213 and the third connecting part 2215.

[0067] like Figure 14 As shown, in the conveying state, the clamping part 2211 is located on the proximal side of the third connecting part 2215, and the supporting part 2213 is located on the distal side of the third connecting part 2215; (See attached image) Figure 12 In its natural state, the third connecting portion 2215 is bent, and the clamping portion 2211 is located outside the supporting portion 2213. The number and position of the plurality of clamping portions 2211 correspond one-to-one with the plurality of supporting portions 2213. The clamping frame 221 is made of shape memory alloy, such as nickel-titanium alloy, and is heat-treated to achieve its natural state.

[0068] like Figure 15 As shown, the clamping part 2211 can be flipped towards the proximal side of the third connecting part 2215 under the action of external force, and maintained in the delivery state under the restraint of the binding line or sheath. In the delivery state, the clamping part 2211 is located on the proximal side of the third connecting part 2215, and the supporting part 2213 is located on the distal side of the third connecting part 2215. When it is necessary to connect the autologous blood vessel 1, the portion of the tubular stent 210 located on the distal side of the third connecting part 2215 is placed inside the autologous blood vessel 1, such as... Figure 16 and Figure 17 As shown, when the sheath or restraint line on the bridging stent 200 is removed, i.e., when the bridging stent 200 is in its natural state, the clamping part 2211 flips to the distal side of the third connecting part 2215 under the elastic force of the third connecting part 2215, so that the clamping part 2211 can cover the outer surface of the autologous blood vessel 1, i.e., the autologous blood vessel 1 is clamped between the tubular stent 210 and the clamping part 2211 to complete the connection between the autologous blood vessel 1 and the bridging stent 200.

[0069] Looking back Figure 12When the clamping skeleton 221 is in its natural state, the number and position of the plurality of clamping parts 2211 and the plurality of supporting parts 2213 correspond one-to-one. Moreover, the distal end of the clamping part 2211 is closer to the tubular stent than the proximal end. Therefore, in addition to being clamped between the clamping part 2211 and the tubular stent, each set of corresponding clamping parts 2211 and supporting parts 2213 can clamp the autologous blood vessel from the inner wall and outer surface of the autologous blood vessel, further strengthening the connection strength of the autologous blood vessel.

[0070] Example 3

[0071] Example 3 provides a bridging bracket 300, such as Figure 18 As shown, the bridging support 300 includes a tubular support 310 and a clamping support 320, with the clamping support 320 surrounding the tubular support 310. The tubular support 310 includes a tubular skeleton 311 and a tubular membrane 312. The clamping support 320 includes a clamping skeleton 321, which is integrally formed from a metal tube. The clamping skeleton 321 includes multiple clamping portions 3211 and multiple first connecting portions 3212.

[0072] The tubular skeleton 311 and the clamping skeleton 321 are made of shape memory alloy, such as nickel-titanium alloy, and are heat-treated to shape them. Figure 18 The natural state shown. In this embodiment, the clamping part 3211 has an inverted V-shaped structure, and the two ends of the clamping part 3211 are respectively connected to one of the first connecting parts 3212. In other embodiments, such as Figure 19 As shown, the clamping part 3211a is straight, one end of the clamping part 3211a is connected to the first connecting part 3212a, and the other end of the clamping part 3211a is a free end. The free end of the clamping part 3211a is constructed into a smooth arc or spherical structure to avoid scratching human tissue.

[0073] The clamping part 3211 can be flipped towards the proximal side of the first connecting part 3212 under the action of external force, and maintained in the delivery state under the restraint of the binding line or sheath. In the delivery state, the clamping part 3211 is located on the proximal side of the first connecting part 3212. When it is necessary to connect autologous blood vessels, the portion of the tubular stent 310 located on the distal side of the first connecting part 3212 is placed inside the autologous blood vessel. When the sheath or binding line on the bridging stent 300 is removed, that is, when the bridging stent 300 is in the natural state, the clamping part 3211 is flipped to the distal side of the first connecting part 3212 under the action of the rebound force of the first connecting part 3212. Thus, the clamping part 3211 can cover the outer surface of the autologous blood vessel, that is, the autologous blood vessel is clamped between the tubular stent 310 and the clamping part 3211 to complete the connection between the autologous blood vessel and the bridging stent 300.

[0074] Example 4

[0075] This embodiment provides a bridging bracket 400, such as Figure 20 As shown, it includes a tubular support 410 and a clamping support 420, with the clamping support 420 surrounding the tubular support 410. The tubular support 410 includes a tubular skeleton 411 and a tubular membrane 412, and the clamping support 420 includes a clamping skeleton 421. The tubular skeleton 411 and the clamping skeleton 421 are integrally formed by cutting a metal tube; or the tubular skeleton 411 is woven from nickel-titanium wire, and the clamping skeleton 421 is fixed to the tubular support 410 by stitching or bonding. In this embodiment, a tubular skeleton structure woven from nickel-titanium wire is used as an example. The connection method between the clamping skeleton and the tubular support is the same as that in Embodiment 1, and will not be repeated in this embodiment.

[0076] The clamping bracket 420 includes a clamping frame 421, which includes a plurality of clamping parts 4211 and a plurality of first connecting parts 4212. The plurality of clamping parts 4211 are arranged along the circumferential direction of the clamping frame 421, and the first connecting parts 4212 are used to connect the clamping parts 4211 and the tubular bracket 410.

[0077] In the conveying state, the clamping part 4211 is located on the proximal side of the first connecting part 4212;

[0078] In its natural state, the clamping part 4211 is located at the distal end of the first connecting part 4212, and the clamping part 4211 clamps the tubular support 410.

[0079] An elastic element 4213 connects two adjacent clamping portions 4211. When the bridging stent 400 is in its natural state, the clamping portions 4211 are tightly attached to the tubular stent 410 under the pull of the elastic element 4213, which can more firmly clamp the autologous blood vessel 1 between the tubular stent 410 and the clamping portion 4211, effectively preventing the autologous blood vessel 1 from falling off during or after the operation, and improving the safety performance of the connection between the bridging stent 400 and the autologous blood vessel 1. In this embodiment, the clamping skeleton 421 is integrally cut from a metal tube, the elastic element 4213 has a wavy structure, and the elastic element 4213 is heat-treated and shaped into a delivery shape to exert tension on the clamping portion 4211. In other embodiments, the elastic element is connected to the clamping portion by welding; or the elastic element is made of a biocompatible elastic material such as rubber, and the elastic element is connected to the clamping portion by bonding or suturing.

[0080] like Figure 21 As shown, the clamping part 4211 can be flipped towards the proximal side of the first connecting part 4212 under the action of external force, and maintained in the delivery state under the restraint of the binding line or sheath. In the delivery state, the clamping part 4211 is located on the proximal side of the first connecting part 4212. When it is necessary to connect the autologous blood vessel 1, the portion of the tubular stent 410 located on the distal side of the first connecting part 4212 is placed in the autologous blood vessel 1. When the sheath or binding line on the bridging stent 400 is removed, due to the action of the elastic element 4213, an external force is required to move the clamping part 4211 away from the tubular stent 410, such as... Figure 22 As shown, when the clamping part 4211 is positioned perpendicular to the tubular support 410, under the expansion force of the tubular support 410 itself and the pulling force of the suture connecting the first connecting part 4212, as Figure 23 and Figure 24 As shown, the clamping part 4211 is flipped around the first connecting part 4212 to the distal end of the first connecting part 4212. Thus, the clamping part 4211 and the elastic member 4213 can cover the outer surface of the autologous blood vessel 1, i.e., the autologous blood vessel is clamped between the tubular stent 410 and the clamping part 4211 to complete the connection between the autologous blood vessel and the bridging stent 400.

[0081] Example 5

[0082] This embodiment provides a bridging bracket 500, which includes a tubular bracket 510 and a clamping bracket 520. The tubular bracket 510 can be a braided bracket or a cut bracket, and the clamping bracket 520 can be any of the clamping brackets described in embodiments 1-4. This embodiment uses the tubular bracket and clamping bracket structure of embodiment 1 as an example. Figure 25 As shown, the tubular stent 510 includes a proximal segment 511 and a distal segment 512. The proximal segment 511 is located on the proximal side of the first connecting portion 5212, and the distal segment 512 is located on the distal side of the first connecting portion 5212. The maximum outer diameter of the distal segment 512 is smaller than the minimum outer diameter of the proximal segment 511. During the procedure, the distal segment 512 of the tubular stent 510 is used to connect to an autologous blood vessel, and the proximal segment 511 of the tubular stent 510 is used to connect to an artificial blood vessel. To ensure a more secure connection between the autologous and artificial blood vessels, after the bridging stent 500 is connected to the autologous blood vessel, the bridging stent and the autologous blood vessel are pulled into the artificial blood vessel, so that the autologous and artificial blood vessels at least partially overlap. Therefore, in this embodiment, the maximum outer diameter of the distal segment 512 is smaller than the minimum outer diameter of the proximal segment 511 to ensure that the bridging stent 500 can still be pulled into the artificial blood vessel after being connected to the autologous blood vessel.

[0083] 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.

[0084] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A bridging bracket, characterized in that, include: A tubular support and a clamping support, wherein the clamping support is arranged around the tubular support; The clamping bracket includes a clamping frame, which includes multiple clamping parts and multiple first connecting parts. The multiple clamping parts are arranged along the circumferential direction of the clamping frame, and the first connecting parts are used to connect the clamping parts and the tubular bracket. In the conveying state, the clamping part is located on the proximal side of the first connecting part; In its natural state, the clamping portion is located at the distal end of the first connecting portion, and the clamping portion clamps the tubular stent; wherein, the bridging stent is used to connect the patient's own blood vessels; Wherein, a first connecting part is connected between two adjacent clamping parts; The clamping frame further includes multiple support parts, multiple second connecting parts, and multiple third connecting parts. The multiple support parts are arranged along the circumferential direction of the tubular support, and each of the multiple support parts is fixedly connected to the tubular support. A second connecting part is connected between two adjacent support parts. The third connecting part is connected between the first connecting part and the second connecting part. In the conveying state, the clamping part is located on the proximal side of the support part; In its natural state, the third connecting part is bent, the clamping part is located outside the support part, and the number and position of the plurality of clamping parts correspond one-to-one with the plurality of support parts.

2. The bridging bracket according to claim 1, characterized in that, The first connecting part includes an arc-shaped structure, and the two ends of the arc-shaped structure are respectively connected to two adjacent clamping parts; at least one first connecting point is provided on the arc-shaped structure, and the arc-shaped structure is fixedly connected to the tubular support at the first connecting point; In its natural state, the opening of the arc-shaped structure faces the distal end of the bridging bracket, and the first connection point is located between the proximal apex of the arc-shaped structure and the distal end of the arc-shaped structure.

3. The bridging bracket according to claim 2, characterized in that, The arc-shaped structure is further provided with a second connection point, which is located at the near-end vertex of the arc-shaped structure; the arc-shaped structure is fixedly connected to the tubular support at the second connection point.

4. The bridging bracket according to claim 1, characterized in that, The tubular support includes a tubular skeleton, which and the clamping skeleton are formed by cutting metal tubes.

5. The bridging bracket according to claim 1, characterized in that, The clamping part has a first section and a second section, one end of the first section is connected to the tubular support through the first connecting part, and the other end is connected to the second section; The first segment has an angle α with the outer surface of the tubular support, and the second segment has an angle β with the first segment, wherein α is less than or equal to 90 degrees, and β is greater than 90 degrees and less than 180 degrees.

6. The bridging bracket according to claim 1, characterized in that, Each of the clamping parts is provided with a groove, and in its natural state, the groove is recessed from the outer surface of the clamping part to the inner side of the tubular support; The axial distance between the groove closest to the proximal end of the bridging bracket and the groove closest to the distal end of the bridging bracket is D, and the axial length of the shortest clamping part among the plurality of clamping parts is L, and D is less than or equal to 1 / 3L.

7. The bridging bracket according to claim 1, characterized in that, An elastic element connects two adjacent clamping parts.

8. The bridging bracket according to any one of claims 1-7, characterized in that, The tubular stent includes a proximal segment and a distal segment, the proximal segment being located on the proximal side of the first connecting portion, and the distal segment being located on the distal side of the first connecting portion; the maximum outer diameter of the distal segment is smaller than the minimum outer diameter of the proximal segment.

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