Groove support

Abstract

The utility model provides a groove support which comprises a main body support and embedded branches, the main body support is tubular and is provided with an inner cavity, and the side face of the main body support is sunken towards the inner cavity to form a groove; the embedded branch is located in the inner cavity of the main body support, the inner cavity of the main body support is communicated with the groove, the embedded branch is fixedly connected with the inner wall of the main body support, the embedded branch comprises a first port and a second port which are located at the two axial ends of the embedded branch respectively, and the first port is connected with the axial end of the groove and communicated with the groove; the first port comprises a first upper edge and a first lower edge, the first upper edge is connected with the inner wall of the body support, the first lower edge is closer to the central axis of the body support compared with the first upper edge, and in the axial direction, the first lower edge is closer to the second port of the embedded branch compared with the first upper edge. According to the groove support, the risk that blood flow of branch blood vessels is blocked after the groove support is implanted can be reduced to a certain degree.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially, relates to a recess support. BACKGROUND

[0002] An aneurysm and an arterial dissection are common vascular diseases in clinical, if not medical intervention, an aneurysm has the risk of rupture, causes great threat to the life of a patient.

[0003] With the continuous development of medical technology, the treatment operation of aneurysm and arterial dissection is used by using minimally invasive surgery to implant a covered stent into the body, because it is small trauma, recovers fast, and has been widely used. This treatment mode is that the covered stent is compressed into a delivery device, guided into the human body along the guide wire track implanted in advance, and the covered stent is released to isolate the lesion after reaching the lesion position, and the blood flow channel is reconstructed. After the aneurysm and the arterial dissection lose blood supply, the residual blood in the aneurysm cavity gradually thrombosis and myelination into vascular tissue, and the aneurysm wall in the expansion state shrinks due to pressure, gradually restores to the original state, so as to achieve the purpose of treating aneurysm and arterial dissection.

[0004] When the occurrence position of an aneurysm or an arterial dissection is close to a branch blood vessel, the opening of the branch blood vessel may be blocked after implanting the covered stent, so as to cause the blood flow of the branch blood vessel to be blocked. CONTENT

[0005] In view of the deficiencies in the above-mentioned technology, the utility model provides a recess support, which can reduce the risk of branch blood vessel blood flow obstruction after implantation to a certain extent.

[0006] The utility model provides a recess support, which is characterized by comprising:

[0007] The main support is tubular and has an inner cavity, and the side surface of the main support is recessed towards the inner cavity direction to form a recess;

[0008] The inner embedded branch is located in the inner cavity of the main support and communicates the inner cavity of the main support with the recess, the inner embedded branch is fixedly connected with the inner wall of the main support, and the inner embedded branch comprises a first port and a second port located at the axial two ends of the inner embedded branch respectively, the first port is connected with the axial end of the recess and communicates with the recess;

[0009] The first port comprises a first upper edge and a first lower edge, the first upper edge is connected with the inner wall of the main support, the first lower edge is closer to the central axis of the main support than the first upper edge, and in the axial direction, the first lower edge is closer to the second port of the inner embedded branch than the first upper edge.

[0010] In one of the embodiments, the recess comprises a recess opening and a recess bottom arranged along a radial direction of the main body support, the first port is beveled, the first upper edge is at least partially connected with an axial end edge of the recess opening, and the first lower edge is at least partially connected with an axial end edge of the recess bottom.

[0011] In one of the embodiments, the second port is beveled, the second port comprises a second upper edge and a second lower edge, at least part of the second upper edge is connected with an inner wall of the main body support, the second lower edge is closer to a central axis of the main body support than the second upper edge, and in an axial direction, the second lower edge is closer to the first port of the embedded branch than the second upper edge.

[0012] In one of the embodiments, the main body support comprises a first main body wave, a second main body wave and a third main body wave, the first main body wave is located between the second main body wave and the third main body wave, and the embedded branch is connected with the first main body wave and the second main body wave; the first main body wave comprises a first wave valley, a first wave peak and a first wave rod connecting the first wave valley and the first wave peak, the second main body wave comprises a second wave valley, a second wave peak and a second wave rod connecting the second wave valley and the second wave peak, the first wave valley and the second wave peak are opposite and close to each other in an axial direction, the first wave peak and the second wave valley are opposite and away from each other in the axial direction, the second wave valley is connected with a proximal end edge of the recess opening, the second port comprises a second upper edge and a second lower edge, at least part of the second upper edge is connected with an inner wall of the main body support, the second lower edge is closer to a central axis of the main body support than the second upper edge, the embedded branch extends from the second wave valley to the first wave peak opposite to the second wave valley in the axial direction, the second port of the embedded branch is beyond the first wave peak in the axial direction, and the second upper edge is located between the first wave peak and the third main body wave, or the second upper edge is located between the first wave peak and the first wave valley.

[0013] In one of the embodiments, the embedded branch comprises a branch covering film, the branch covering film is recessed towards a direction close to a central axis of the main body support, the branch covering film comprises two side edges extending along an axial direction, the two side edges are arranged along a circumferential direction of the main body support and are fixedly connected with an inner wall of the main body support respectively and jointly enclose an inner cavity of the embedded branch.

[0014] The application further provides a recess support, comprising:

[0015] a main body support, the main body support is tubular and has an inner cavity, and a side surface of the main body support is recessed towards a direction of the inner cavity to form a recess;

[0016] The embedded branch is located in the inner cavity of the main body stent and communicates the inner cavity of the main body stent with the groove, and the embedded branch is fixedly connected with the inner wall of the main body stent.

[0017] The embedded branch comprises a tubular branch covering and a branch support structure connected with the branch covering, and the branch support structure is woven by a woven wire, and the wire head of the woven wire is limited between the branch covering and the inner wall of the main body stent.

[0018] In one embodiment, the groove comprises a groove opening and a groove bottom arranged along the radial direction of the main body stent, and the embedded branch comprises a first port and a second port respectively located at the axial two ends of the embedded branch, the first port is connected with the axial end of the groove and communicates with the groove.

[0019] In one embodiment, the first port comprises an annular support with a developing function, the annular support is a closed annular structure or a non-closed annular structure, and a partial region of the annular support is connected with the axial end edge of the groove opening.

[0020] In one embodiment, the main body stent comprises a first main body wave ring and a second main body wave ring arranged in sequence and spaced along the axial direction, the first main body wave ring comprises a first wave valley, a first wave peak and a first wave rod connecting the first wave valley and the first wave peak, the second main body wave ring comprises a second wave valley, a second wave peak and a second wave rod connecting the second wave valley and the second wave peak, the first wave valley and the second wave peak are opposite and close to each other in the axial direction, the first wave peak and the second wave valley are opposite and away from each other in the axial direction, the second wave valley is connected with the proximal edge of the groove opening, and the embedded branch is connected with the first main body wave ring and the second main body wave ring.

[0021] In one embodiment, the branch support structure of the embedded branch comprises a first wave unit, a second wave unit and a keel connecting the first wave unit and the second wave unit arranged in the axial direction of the embedded branch, and the keel intersects with the generatrix of the branch covering of the embedded branch.

[0022] In one embodiment, the first port and the second port each comprise a ring-shaped support, the branch support structure of the embedded branch comprises a first wave-shaped unit and a second wave-shaped unit arranged axially along the embedded branch, the first wave-shaped unit is closer to the first port than the second wave-shaped unit, the first wave-shaped unit and the second wave-shaped unit each comprise a plurality of waves arranged circumferentially along the embedded branch, each wave has a vertex, the vertices of the first wave-shaped unit closer to the first port are in contact with and connected to the ring-shaped support of the first port, and / or the vertices of the second wave-shaped unit closer to the second port are in contact with and connected to the ring-shaped support of the second port.

[0023] In one embodiment, the branch support structure of the embedded branch comprises a first wave-shaped unit and a second wave-shaped unit arranged axially along the embedded branch, the branch support structure further comprises a first support rod and / or a second support rod, the first wave-shaped unit and the second wave-shaped unit each comprise a first end and a second end in the circumferential direction, the first end of the first wave-shaped unit and the first end of the second wave-shaped unit are on the same side, and the second end of the first wave-shaped unit and the second end of the second wave-shaped unit are on the same side; the first end of the first wave-shaped unit and the first end of the second wave-shaped unit are connected by the first support rod at both ends, and / or the second end of the first wave-shaped unit and the second end of the second wave-shaped unit are connected by the second support rod at both ends.

[0024] In one embodiment, the keel is connected to a first winding portion and a second winding portion at both ends, the first winding portion is connected to the first wave-shaped unit by winding, the second winding portion is connected to the second wave-shaped unit by winding, the first wave-shaped unit and the second wave-shaped unit each comprise a plurality of waves arranged circumferentially along the embedded branch, each wave comprises two wave rods, the first winding portion and / or the second winding portion comprises at least one winding unit, the winding unit is in one or more of a V shape, an inverted V shape, an M shape, and a W shape, and each winding unit extends over at least two adjacent wave rods.

[0025] In one embodiment, the branch support structure is integrally woven by a woven wire, and the wire head of the woven wire is located in the area where the first winding portion and / or the second winding portion is located.

[0026] In one embodiment, the first winding portion and / or the second winding portion is connected to the branch covering film of the embedded branch by a plurality of interconnected suture knots.

[0027] In one of the embodiments, the embedded branch is connected to the main body support through at least two fixing parts extending along the axial direction of the embedded branch and spaced along the circumference of the main body support, and the wire head is located between the two fixing parts.

[0028] The utility model discloses beneficial effect is: compared with prior art, the utility model discloses a recess and the embedded branch that communicates with the recess are set up on the main body support, when the main body support is implanted into the target lumen, the embedded branch can guide the blood flow in the main body support into the recess, and the blood flow enters the branch blood vessel through the recess, thereby can reduce the risk of causing the blood flow of branch blood vessel to be blocked after implantation to a certain extent. In addition, since the first port of the embedded branch is connected with the axial end of the recess, therefore, the guide wire and the branch blood vessel support can more easily enter the embedded branch through the recess, thereby can more efficiently realize the butt joint of the branch blood vessel support and the embedded branch, thereby better guarantee the blood supply in the branch blood vessel. The first lower edge of the embedded branch is closer to the second port of the embedded branch than the first upper edge, when the recess support is implanted into the relatively narrow target lumen, the main body support and the first upper edge can jointly resist the extrusion of the inner wall of the narrow lumen, thereby reduce the risk of the first port obstruction, and simultaneously, since the first upper edge and the first lower edge are not located on the same radial plane, are more easily compressed radially into the delivery device, are convenient for loading, and the release force is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the implantation state schematic drawing of the recess support of the utility model;

[0030] Figure 2 It is the structure schematic drawing of the recess support of one embodiment of the utility model;

[0031] Figure 3 It is the structure schematic drawing of the recess support of one embodiment of the utility model (net cover is not shown);

[0032] Figure 4 It is the structure schematic drawing of the embedded branch of one embodiment of the utility model;

[0033] Figure 5 It is the position schematic drawing of the embedded branch of one embodiment of the utility model;

[0034] Figure 6 It is the structure schematic drawing of the embedded branch of one embodiment of the utility model;

[0035] Figure 7 It is the expansion schematic drawing of the branch support structure of one embodiment of the utility model;

[0036] Figure 8 It is the expansion schematic drawing of the embedded branch of one embodiment of the utility model;

[0037] Figure 9The schematic view of the suture knot of one embodiment of the present application;

[0038] Figure 10 The schematic view of the embedded branch connecting the fixed part and the main body support of one embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to better understand the concept of the present application, the embodiments of the present application will be described in detail below in combination with the drawings. The following specific embodiments are only part of the embodiments of the present application, and are not a limitation of the present application.

[0040] In order to facilitate the description, spatial relative terms can be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the drawings, such as "internal", "external", "inboard", "outboard", "under", "below", "on", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, the element described as "under" or "below" the other element or feature will then be oriented "above" or "above" the other element or feature. Therefore, the example term "below" can include both upward and downward orientations. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0041] In order to more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined as conventional terms in the field of interventional medicine. Specifically, "distal end" means the end from which blood flows out, and "proximal end" means the end from which blood flows in, for example, after stent implantation, blood flows from the proximal end of the stent to the distal end; "axial direction" means the length direction, and "radial direction" means the direction perpendicular to the "axial direction".

[0042] The "wave ring" (also referred to as a wave-shaped ring) is a closed ring structure, and the "wave unit" is an arc structure. The "wave ring" and the "wave unit" are made of a metal elastic material or a high polymer material. The metal elastic material includes known materials or a combination of various biocompatible materials implanted in a medical device, such as an alloy of two or more than two single metals in cobalt, chromium, nickel, titanium, magnesium, iron, and 316L stainless steel, nickel-titanium-tantalum alloy, nitrided iron, iron-manganese alloy, sulfurized iron, and carbonized iron, or other metal elastic materials with biocompatibility. The metal elastic material can be a non-degradable material or a degradable material. The high polymer material includes one or more than one of a blend of polylactic acid, polyglycolic acid, polybutylene succinate, poly(beta-hydroxybutyric acid ester), poly(caprolactone), poly(adipic acid), glycol ester, poly(lactic acid-glycolic acid copolymer), poly(hydroxybutyric acid valerate copolymer), poly(hydroxyalkyl alcohol ester), poly(beta-malic acid ester), or a copolymer of monomers of at least two of the above. The high polymer material can also be a biocompatible material such as starch, cellulose, polysaccharide, chitin, chitosan, or a derivative thereof. The "wave ring" and the "wave unit" both have a radial expansion capability, can be radially contracted under an external force, and can restore to the original shape and maintain the original shape after the external force is removed or through mechanical expansion (for example, through balloon expansion), so that the "wave ring" and the "wave unit" can be tightly attached to the inner wall of the lumen by the radial support force after being implanted in the lumen. The wave shape of the "wave ring" and the "wave unit" is not limited, and includes Z-shaped waves, M-shaped waves, V-shaped waves, sine waves, and the like. The "wave ring" and the "wave unit" both include a plurality of wave crests (also referred to as proximal vertices), a plurality of wave troughs (also referred to as distal vertices), and wave rods connecting adjacent wave crests and wave troughs. One vertex (proximal vertex or distal vertex) and two wave rods connected to the vertex form a wave.

[0043] The "film" in the utility model can insulate liquid to a certain extent, and can be made of polytetrafluoroethylene (Poly tetrafluoroethylene, referred to as PTFE), polyethylene terephthalate (Polyethylene terephthalate, referred to as PET) and other high polymer materials with good biocompatibility.

[0044] Please refer to Figure 1 The groove support 100 of the embodiment is used for implanting into a target lumen. The target lumen can be any cavity in a living body, and the utility model is not limited to the type of the target lumen. For the convenience of understanding, the utility model takes the aortic arch 500 as the target lumen for example. Refer to Figure 1The aortic arch 100 is connected with three branch vessels 200, the branch vessels 200 are connected at the large bending side of the aortic arch 100, blood flows from the aortic arch 100 to the branch vessels 200, and an aneurysm 400 is formed at the small bending side of the aortic arch 100 (only for illustration, in other cases, the aneurysm 400 can be distributed at other positions of the aortic arch 100). By implanting the recessed stent 100 in the aortic arch 100 to isolate the aneurysm 400, the blood flowing in the recessed stent 100 cannot contact the aneurysm 400, and finally the purpose of treating the aneurysm 400 is achieved. Branch vessel stents 300 can also be implanted in the three branch vessels 200, the branch vessel stents 300 are connected with the recessed stent 100, and the blood in the recessed stent 100 enters the branch vessels 200 through the branch vessel stents 300.

[0045] Please refer to Figure 2 、 Figure 3 The recessed stent 100 of the embodiment includes a main stent 10 and an embedded branch 20. The main stent 10 is tubular and has an inner cavity, for example, the main stent 10 can be a hollow tubular structure with openings at both ends, and the side surface is recessed to form a recess 50 towards the inner cavity direction. The embedded branch 20 is located in the inner cavity of the main stent 10, and communicates the inner cavity of the main stent 10 with the recess 50, and the embedded branch 20 is fixedly connected with the inner wall of the main stent 10. The embedded branch 20 includes a first port 21 and a second port 22 located at the axial two ends of the embedded branch 20 respectively, the first port 21 is connected with the axial end of the recess 50 and communicates with the recess 50. In the embodiment, the embedded branch 20 can be located at the proximal end side of the recess 50, or at the distal end side of the recess 50. The embedded branch 20 can be provided with one or more, for example, two embedded branches 20 are provided at the proximal end side of the recess 50, and one embedded branch 20 is provided at the distal end side of the recess 50. In the embodiment, the embedded branch 20 provided at the proximal end side of the recess 50 can be referred to as a proximal end branch 20a, and the embedded branch 20 provided at the distal end side of the recess 50 can be referred to as a distal end branch 20b, wherein the proximal end branch 20a and / or the distal end branch 20b can be omitted.

[0046] Please refer to Figure 2 、 Figure 3 、 Figure 4The first port 21 of the inlaid branch 20 comprises a first upper edge 211 and a first lower edge 212. The first upper edge 211 is connected to the inner wall of the main body stent 10, and the first lower edge 212 is closer to the central axis of the main body stent 10 than the upper edge. The second port 22 has a second upper edge 221 and a second lower edge 222. The second upper edge 221 is connected to the inner wall of the main body stent 10, and the second lower edge 222 is closer to the central axis of the main body stent 10 than the second upper edge 221. In the axial direction, the first lower edge 212 is closer to the second port 22 of the inlaid branch 20 than the first upper edge 211. For example, the first port 21 can be beveled, and when the inlaid branch 20 is a proximal branch 20a, the first lower edge 212 is closer to the proximal end of the main body stent 10 than the first upper edge 211. In other embodiments, the first port 21 can be flat (see FIG. 2B). Figure 6 ).

[0047] The present embodiment can reduce the risk of blood flow obstruction in the branch blood vessel 200 after implantation by providing the recess 50 and the inlaid branch 20 communicating with the recess 50 on the main body stent 10. After the main body stent 10 is implanted in the target lumen, the inlaid branch 20 can guide the blood flow in the main body stent 10 into the recess 50, and the blood flow can enter the branch blood vessel 200 through the recess 50, thereby reducing the risk of blood flow obstruction in the branch blood vessel 200 to some extent. In addition, since the first port 21 of the inlaid branch 20 is connected to the axial end of the recess 50, the guide wire and the branch blood vessel stent 300 can more easily enter the inlaid branch 20 through the recess 50, thereby more efficiently realizing the docking of the branch blood vessel stent 300 and the inlaid branch 20, and better ensuring the blood supply in the branch blood vessel 200. The first lower edge 212 of the inlaid branch 20 is closer to the second port 22 of the inlaid branch 20 than the first upper edge 211. When the recess stent 100 is implanted in a relatively narrow target lumen, the main body stent 10 and the first upper edge 211 can jointly resist the extrusion of the inner wall of the narrow lumen, thereby reducing the risk of blockage of the first port 21. In addition, since the first upper edge 211 and the first lower edge 212 are not located in the same radial plane, they are more easily compressed radially into a delivery device, are convenient to load, and require a smaller release force.

[0048] Referring to Figure 2 , Figure 3 , Figure 4In one embodiment, the recess 50 includes a recess opening 52 and a recess bottom 51 arranged along a radial direction of the main body stent 10, and the recess opening 52 is directed to a radial outer side of the recess stent 100. The first port 21 can be beveled, and the first upper edge 211 is at least partially connected to an axial end edge 522 of the recess opening 52, and the first lower edge 212 is at least partially connected to an axial end edge of the recess bottom 51, so that the recess bottom 51 can well guide the guide wire or the branch vessel stent 300 into the inlaid branch 20, and the implantation efficiency of the branch vessel stent 300 is improved. As shown in the figure, the first upper edge 211 of the proximal branch 20a can be an arc-shaped structure that is curved and protrudes in a direction away from the distal end of the main body stent 10, and the first upper edge 211 of the proximal branch 20a is connected to the axial end edge 522 of the recess opening 52 at a portion that is closer to a side edge of the recess 50 (i.e., a recess edge extending along an axial direction of the main body stent 10), and the upper edge of the remaining portion is not directly connected to the axial end edge 522 of the recess opening 52, but extends toward the proximal end of the main body stent 10. A portion of the first lower edge 212 of the proximal branch 20a is connected to the axial end edge of the recess bottom 51, and another portion is connected to a portion of the first lower edge 212 of another proximal branch 20a adjacent thereto. In other embodiments, the first upper edge 211 can be entirely connected to the axial end edge 522 of the recess opening 52, and the first lower edge 212 can be entirely connected to the axial end edge of the recess bottom 51.

[0049] In one embodiment, the first port 21 includes a ring-shaped support 25 having a developing function. The ring-shaped support 25 can be a closed ring structure or a non-closed ring structure, and a portion of the ring-shaped support 25 is connected to the axial end edge 522 of the recess opening 52. The ring-shaped support 25 can be made of a material having good X-ray impermeability, strong corrosion resistance, and good biocompatibility, for example, gold, platinum, tantalum, osmium, rhenium, tungsten, iridium, rhodium, or an alloy of at least two of these materials. The ring-shaped support 25 not only can better maintain the shape of the branch port, but also can develop during the operation to better indicate the position of the branch port while providing support, especially when a portion of the ring-shaped support 25 is connected to the axial end edge 522 of the recess opening 52, the edge position of the recess opening 52 and the position of the first port 21 can be more accurately indicated, so that the guide wire or the branch vessel stent 300 (see Figure 1 ) can be more accurately guided into the inlaid branch 20.

[0050] Referring to Figure 5In one embodiment, the main body support 10 comprises a first main body wave 111 and a second main body wave 112 arranged in sequence along the axial direction, the first main body wave 111 comprises a first wave trough 1111, a first wave crest 1112 and a first wave rod 1113 connecting the first wave trough 1111 and the first wave crest 1112, the second main body wave 112 comprises a second wave trough 1121, a second wave crest 1122 and a second wave rod 1123 connecting the second wave trough 1121 and the second wave crest 1122, the first wave trough 1111 and the second wave crest 1122 are axially aligned and close to each other, the first wave crest 1112 and the second wave trough 1121 are axially aligned and far away from each other, the second wave trough 1121 is connected with the proximal edge of the groove opening 52, and the embedded branch 20 extends from the second wave trough 1121 to the first wave crest 1112 axially opposite to the second wave trough 1121.

[0051] Exemplarily, the main body support 10 comprises a main body support portion 11 and a main body covering film 12. The main body covering film 12 can be arranged on the inner surface and / or the outer surface of the main body support portion 11. For example, the main body covering film 12 can be arranged only on the outer surface of the main body support portion 11, or arranged on part or all of the inner surface and / or the outer surface of the main body support portion 11. For example, the main body support portion 11 comprises a plurality of main body wave coils 101 arranged in sequence along the axial direction. The main body covering film 12 can be arranged on the inner surface and / or the outer surface of the main body wave coils by means of sewing, bonding, hot melting or the like, and connect the plurality of main body wave coils. Exemplarily, the main body support 10 can comprise a first main body wave coil 111 and a second main body wave coil 112 arranged in sequence along the axial direction. The first main body wave coil 111 comprises a first wave valley 1111, a first wave peak 1112 and a first wave rod 1113 connecting the first wave valley 1111 and the first wave peak 1112. The second main body wave coil 112 comprises a second wave valley 1121, a second wave peak 1122 and a second wave rod 1123 connecting the second wave valley 1121 and the second wave peak 1122. The first wave valley 1111 and the second wave peak 1122 are opposite to and close to each other in the axial direction. The first wave peak 1112 and the second wave valley 1121 are opposite to and away from each other in the axial direction. The first main body wave coil 111 and the second main body wave coil 112 enclose one or more rhombic or rhomboid-like spaces. The embedded branch 20 is connected to the first main body wave coil 111 and the second main body wave coil 112. The embedded branch 20 extends from the second wave valley 1121 to the first wave peak 1112 opposite to the second wave valley 1121 in the axial direction. In this way, the area where the first main body wave coil 111 and the second main body wave coil 112 are located and the embedded branch 20 are not prone to shortening or the degree of shortening is effectively limited, which is conducive to reducing the risk that the tip of the delivery device hooks the second port 22 during the retraction process, causing excessive deformation and displacement of the embedded branch 20 and the main support. The second wave valley 1121 is connected to the proximal edge of the groove opening 52, for example, by means of sewing, bonding or the like. In this way, the edge of the groove opening 52 and the shape of the first port 21 can be better maintained, and the risk of blockage of the first port 21 can be reduced. Figure 5 The embedded branch 20 and the first main body wave coil 111 and the second main body wave coil 112 are located on the proximal side of the groove 50. In other embodiments, the embedded branch 20 and the first main body wave coil 111 and the second main body wave coil 112 can be located on the distal side of the groove 50.

[0052] In one embodiment, the main body stent 10 further comprises a third main body loop 113, the first main body loop 111 is located between the second main body loop 112 and the third main body loop 113, the proximal end of the embedded branch 20 axially extends beyond the first wave crest 1112, and the second upper edge 221 is located between the first wave crest 1112 and the third main body loop 113. In this way, the second port 22 is prevented from overlapping the first main body loop 111, so that when the second port 22 is sutured to the main body stent 10, the inconsistency of the suture density will not cause blood leakage from the second port 22 into the groove 50. In other embodiments, the second upper edge 221 is located between the first wave crest 1112 and the first wave trough 1111.

[0053] In one embodiment, the second port 22 of the embedded branch 20 can also be beveled. In the axial direction, the second lower edge 222 is closer to the first port 21 of the embedded branch 20 than the second upper edge 221. In this way, it is beneficial to reduce the risk of the tip of the delivery device hooking the second port 22 during retraction, causing deformation and displacement of the embedded branch 20 and the main stent. In addition, since the second upper edge 221 and the second lower edge 222 are not located in the same radial plane, they are more easily compressed radially into the delivery device, facilitating loading and requiring less release force. In other embodiments, the second port 22 can be flat (see Figure 6 ).

[0054] In one embodiment, the embedded branch 20 comprises a branch covering film 23, which is recessed towards the direction of the central axis of the main body stent 10. The branch covering film 23 comprises two side edges extending in the axial direction, which are spaced apart along the circumferential direction of the main body stent 10 and are respectively fixedly connected to the inner wall of the main body stent 10 to jointly form an inner cavity of the embedded branch 20. Referring to Figure 5 , the two proximal branches 20a are arranged side by side along the circumferential direction of the main body stent 10, and the inner side edges 231 of the branch covering films 23 of the two proximal branches 20a (i.e., the side edges of the branch covering films 23 of the two proximal branches 20a closer to the side of the adjacent proximal branch 20a) extend through the axially opposite and mutually close first wave trough 1111 and the second wave crest 1122. The outer side edges 232 of the branch covering films 23 of the two proximal branches 20a are closer to the axially opposite and mutually distant first wave crest 1112 and the second wave trough 1121.

[0055] Referring to Figure 4 , Figure 7 , Figure 8The branch covering film 23 is provided with a branch support structure 24, which comprises first wave units 24a and second wave units 24b arranged along the axial direction of the embedded branch 20. Exemplarily, the first wave units 24a and the second wave units 24b each comprise a plurality of waves, each wave having an apex 241 (the apex 241 is a wave peak or a wave trough). The apexes 241 of the first wave units 24a closer to the first port 21 are each in abutment with and connected to the annular support 25 of the first port 21, and / or the apexes 241 of the second wave units 24b closer to the second port 22 are each in abutment with and connected to the annular support 25 of the second port 22. Such arrangement makes the branch covering film 23 in the region between the axial end of the branch support structure 24 and the port of the embedded branch 20 less prone to wrinkling, thereby avoiding or reducing the problem of poor fit between the port of the embedded branch 20 and the branch blood vessel stent 300, which may cause internal leakage.

[0056] With reference to Figure 7 , Figure 8 The wave heights of the plurality of waves in the first wave units 24a and the second wave units 24b can be consistent or different. For example, the first wave units 24a and the second wave units 24b each comprise three waves in the figure, and the wave height of the wave in the middle is less than the wave heights of the waves on the two sides. The apexes 241 of the first wave units 24a closer to the first port 21 are not on the same straight line to better match the beveled shape of the first port 21, and the apexes 241 of the first wave units 24a closer to the second port 22 are substantially on the same straight line to provide more uniform radial support. And / or, the apexes 241 of the second wave units 24b closer to the second port 22 are not on the same straight line to better match the beveled shape of the second port 22, and the apexes 241 of the second wave units 24b closer to the first port 21 are substantially on the same straight line to provide more uniform radial support.

[0057] With reference to Figure 7 , Figure 8 In an embodiment, the branch support structure 24 further comprises a keel 24c connecting the first wave units 24a and the second wave units 24b. The keel 24c extends obliquely and intersects the generatrix of the branch covering film 23. The obliquely extending keel 24c not only effectively reduces the probability of shortening of the embedded branch 20, but also makes the embedded branch 20 have better flexibility. The keel 24c is located on the side of the embedded branch 20 closer to the central axis of the main body stent 10, so that this side has a relatively stable shape, and the region where the embedded branch 20 is connected to the main body stent 10 is also less prone to shortening, thus enabling the embedded branch 20 as a whole to better maintain the shape. Figure 7The keel 24c can divide the blank covered area in the branch support structure 24 into two equal parts, so that the branch covered area 23 on both sides of the keel 24c can be evenly supported. In other embodiments, the keel 24c does not necessarily divide the blank covered area in the branch support structure 24 into two equal parts.

[0058] Referring to Figure 7 , Figure 8 In one embodiment, the keel 24c is connected with a first winding part 251 and a second winding part 252 at two ends respectively, the first winding part 251 is woundly connected with the first wave unit 24a, and the second winding part 252 is woundly connected with the second wave unit 24b. Each wave in the first wave unit 24a and the second wave unit 24b includes two wave rods. The first winding part 251 and / or the second winding part 252 includes at least one winding unit 2511, which is in one or more of a V shape, an inverted V shape, an M shape, and a W shape, and each winding unit 2511 extends over at least two adjacent wave rods. The arrangement of the winding unit 2511 is conducive to improving the stability of the connection between the keel 24c and the first wave unit 24a and the second wave unit 24b, and conducive to better maintaining the shape of the embedded branch 20. Further, the branch support structure 24 can be integrally woven by woven wires (e.g., shape memory metal wires, polymer wires, etc.), and the woven wires include wire heads at the end portions, which are located in the area where the first winding part 251 and / or the second winding part 252 is located. For example, the wire head can be part of the first winding part 251 and / or the second winding part 252, or part of the wave rod wound by the first winding part 251 and / or the second winding part 252. The wire head located in the area where the first winding part 251 and / or the second winding part 252 is located can reduce the risk of wire head loosening and wire head piercing out to damage the tissue or the fluted stent 100 and the branch vessel stent 300. In other embodiments, the wire head does not necessarily have to be located in the area where the first winding part 251 and / or the second winding part 252 is located. Referring to Figure 9 Further, the first winding part 251 and / or the second winding part 252 can be connected with the branch covered membrane 23 through a plurality of suture knots 27 connected with each other, so that even if one of the suture knots 27 or the suture around the suture knot 27 is broken, the other suture knots 27 can well limit the wire head to prevent the wire head from loosening and piercing out. In other embodiments, the first winding part 251 and / or the second winding part 252 can be fixed to the branch covered membrane 23 by suture such as suture winding, or by adhesion.

[0059] Referring to Figure 6 , Figure 10In one embodiment, the distal branch 20b is tubular and can be deformed to a certain extent relative to the main body stent 10, so as to be able to be inserted into a branch vessel stent 300 with a large bending angle, and not to affect the patency of the branch. The wire heads of the branch support structure 24 are limited between the branch covering 23 and the inner wall of the main body stent 10. Such an arrangement is conducive to further preventing the wire heads from being pierced out. Further, the distal branch 20b is connected to the main body stent 10 by at least two fixing portions 28 (for example, fixing sutures) extending along the axial direction of the distal branch 20b, and the wire heads are located between the two fixing portions 28, which is conducive to further preventing the wire heads from being pierced out. In other embodiments, the wire heads of the branch support structure 24 can be located at any position of the embedded branch 20.

[0060] Referring to Figure 7 In one embodiment, the branch support structure 24 can further include a first support rod 253 and / or a second support rod 254, the first wave-shaped unit 24a and the second wave-shaped unit 24b each include a first end and a second end in the circumferential direction, the first end of the first wave-shaped unit 24a and the first end of the second wave-shaped unit 24b are located on the same side, and the second end of the first wave-shaped unit 24a and the second end of the second wave-shaped unit 24b are located on the same side; the first support rod 253 is connected to the first end of the first wave-shaped unit 24a and the first end of the second wave-shaped unit 24b at two ends, respectively, and / or the second support rod 254 is connected to the second end of the first wave-shaped unit 24a and the second end of the second wave-shaped unit 24b at two ends, respectively. The first support rod 253 and / or the second support rod 254 can further reduce the shortening rate of the embedded branch 20. In other embodiments, the first support rod 253 and / or the second support rod 254 can be omitted.

[0061] Referring to Figure 2 The recess stent 100 can further include a main body stent 10 and a mesh cover 40 connected to the main body stent 10. The mesh cover 40 is connected to the recess 50, and at least a part of the mesh cover 40 and the recess bottom 51 form a radial interval in the radial direction of the recess stent 100, and the radial interval is in communication with the inner cavity of the main body stent 10. In this embodiment, the projection of the mesh cover 40 on the radial plane of the recess stent 100 corresponds to a central angle of a circle, which can be less than or equal to 180 degrees, for example, 120 degrees, so that the mesh cover 40 has good radial support force, and ensures that there is enough space in the inner cavity of the main body stent 10 for blood flow. In other embodiments, the recess 50 can be an annular recess 50, and the mesh cover 40 is tubular and is sleeved outside the recess 50.

[0062] In one embodiment, the mesh cover 40 is in an arc structure in the circumferential direction of the groove bracket 100. The mesh cover 40 includes a mesh structure formed by braiding the braided wires 40, the mesh structure including a mesh body and side connectors provided at the radial side edges of the mesh body, and the mesh structure is connected (e.g., fixedly connected) to the main bracket 10 through the side connectors. The mesh structure includes a plurality of overlapping points (or intersection points) formed by the overlapping (or intersection) of the braided wires 40, at which the braided wires 40 can slide relative to each other, and the mesh structure also includes a plurality of deformable mesh holes in communication with the outside to facilitate the insertion of the guide wire and the branch vessel stent 300. The mesh cover 40 can be integrally braided by braided wires made of shape memory alloy or other materials, or can be separately braided and then spliced. In other embodiments, the mesh structure of the mesh cover 40 can also be formed by cutting; or, in other embodiments, the mesh cover 40 can not include a mesh structure, but can include a hollow structure having through holes, or other structures having through holes, such as a structure formed by a plurality of wave-shaped rings arranged in an axial direction. In other embodiments, the mesh cover 40 described above can be omitted.

[0063] The above specific embodiments are only part of the embodiments of the present application, and are not a limitation of the present application. The present specification cannot exhaust all embodiments of the present application, and part of the features of the above different embodiments can be replaced or combined with each other. The skilled in the art can also make simple replacements according to the actual needs, and the concept of the present application is subject to the scope of protection.

Claims

1. A recessed bracket, characterized in that, The application relates to a main body support, which is tubular and has an inner cavity, and a recess is formed on the side of the main body support towards the inner cavity. The inner embedded branch is located in the inner cavity of the main body support and communicates the inner cavity of the main body support with the recess, and the inner embedded branch is fixedly connected with the inner wall of the main body support. The first port comprises a first upper edge and a first lower edge, the first upper edge is connected with the inner wall of the main body support, the first lower edge is closer to the central axis of the main body support than the first upper edge, and in the axial direction, the first lower edge is closer to the second port of the inner embedded branch than the first upper edge. The recess comprises a recess opening and a recess bottom arranged along the radial direction of the main body support, the first port is beveled, the first upper edge is at least partially connected with the axial end edge of the recess opening, and the first lower edge is at least partially connected with the axial end edge of the recess bottom.

2. The recessed mount of claim 1, wherein, The second port is beveled, the second port comprises a second upper edge and a second lower edge, at least part of the second upper edge is connected with the inner wall of the main body support, the second lower edge is closer to the central axis of the main body support than the second upper edge, and in the axial direction, the second lower edge is closer to the first port of the inner embedded branch than the second upper edge.

3. The recessed mount of claim 1 or 2, wherein, The main body support comprises a first main body wave, a second main body wave and a third main body wave, the first main body wave is located between the second main body wave and the third main body wave, and the inner embedded branch is connected with the first main body wave and the second main body wave; the first main body wave comprises a first wave valley, a first wave peak and a first wave rod connecting the first wave valley and the first wave peak, the second main body wave comprises a second wave valley, a second wave peak and a second wave rod connecting the second wave valley and the second wave peak, the first wave valley and the second wave peak are opposite and close to each other in the axial direction, the first wave peak and the second wave valley are opposite and far away from each other in the axial direction, the second wave valley is connected with the proximal edge of the recess opening, the second port comprises a second upper edge and a second lower edge, at least part of the second upper edge is connected with the inner wall of the main body support, the second lower edge is closer to the central axis of the main body support than the second upper edge, the inner embedded branch extends from the second wave valley to the first wave peak opposite to the second wave valley in the axial direction, the second port of the inner embedded branch is beyond the first wave peak in the axial direction, and the second upper edge is located between the first wave peak and the third main body wave, or the second upper edge is located between the first wave peak and the first wave valley.

4. The recessed mount of claim 2, wherein, The application relates to a main body support, which is tubular and has an inner cavity, and a recess is formed on the side of the main body support towards the inner cavity.

5. A recessed mount, characterized by The inner embedded branch is located in the inner cavity of the main body support and communicates the inner cavity of the main body support with the recess, and the inner embedded branch is fixedly connected with the inner wall of the main body support. ​ ​ The embedded branch includes a tubular branch covering and a branch support structure connected with the branch covering, the branch support structure is woven by braided wires, and wire heads of the braided wires are limited between the branch covering and an inner wall of the main body stent.

6. The recessed mount of claim 5, wherein, The groove includes a groove opening and a groove bottom arranged along a radial direction of the main body stent, and the embedded branch includes a first port and a second port respectively located at two axial ends of the embedded branch, the first port is connected with an axial end of the groove and communicates with the groove.

7. The recessed mount of claim 2 or 6, wherein, The first port includes an annular support having a developing function, the annular support is a closed annular structure or an open annular structure, and a partial region of the annular support is connected with an axial end edge of the groove opening.

8. The recessed mount of claim 2 or 6, wherein, The main body stent includes a first main body wave and a second main body wave arranged in sequence and spaced along an axial direction, the first main body wave includes a first wave valley, a first wave peak and a first wave rod connecting the first wave valley and the first wave peak, the second main body wave includes a second wave valley, a second wave peak and a second wave rod connecting the second wave valley and the second wave peak, the first wave valley and the second wave peak are opposite and close to each other along the axial direction, the first wave peak and the second wave valley are opposite and away from each other along the axial direction, the second wave valley is connected with a proximal end edge of the groove opening, and the embedded branch is connected with the first main body wave and the second main body wave.

9. The recessed mount of claim 1 or 6, wherein, The branch support structure of the embedded branch includes a first wave unit, a second wave unit and a keel connecting the first wave unit and the second wave unit arranged in sequence and spaced along an axial direction of the embedded branch, and the keel intersects with a generatrix of the branch covering of the embedded branch.

10. The recessed mount of claim 1 or 6, wherein, The first port and the second port each include an annular support, the branch support structure of the embedded branch includes a first wave unit and a second wave unit arranged in sequence and spaced along an axial direction of the embedded branch, the first wave unit is closer to the first port than the second wave unit, and the first wave unit and the second wave unit each include a plurality of waves arranged in sequence and spaced along a circumferential direction of the embedded branch, each of the waves has an apex, the apexes of the first wave unit closer to the first port are in contact with and connected with the annular support of the first port, and / or the apexes of the second wave unit closer to the second port are in contact with and connected with the annular support of the second port.

11. The recessed mount of claim 1 or 6, wherein, The branch support structure of the embedded branch comprises first wave-shaped units and second wave-shaped units arranged axially along the embedded branch, and further comprises first support rods and / or second support rods, the first wave-shaped units and the second wave-shaped units each comprise first end portions and second end portions in the circumferential direction, the first end portions of the first wave-shaped units and the first end portions of the second wave-shaped units are located on the same side, and the second end portions of the first wave-shaped units and the second end portions of the second wave-shaped units are located on the same side; the first end portions of the first wave-shaped units and the first end portions of the second wave-shaped units are respectively connected by the first support rods at both ends, and / or the second end portions of the first wave-shaped units and the second end portions of the second wave-shaped units are respectively connected by the second support rods at both ends.

12. The recessed mount of claim 9, wherein, The keel is connected with a first winding portion and a second winding portion at both ends, the first winding portion is connected with the first wave-shaped unit in a winding manner, the second winding portion is connected with the second wave-shaped unit in a winding manner, the first wave-shaped unit and the second wave-shaped unit each comprise a plurality of waves arranged in the circumferential direction of the embedded branch, each wave comprises two wave rods, the first winding portion and / or the second winding portion comprises at least one winding unit, the winding unit is in one or more of a V shape, an inverted V shape, an M shape and a W shape, and each winding unit extends on at least two adjacent wave rods.

13. The recessed mount of claim 12, wherein, The branch support structure is integrally woven by a woven wire, and wire heads of the woven wire are located in an area where the first winding portion and / or the second winding portion are located.

14. The recessed mount of claim 13, wherein, The first winding portion and / or the second winding portion are connected with the branch covering film of the embedded branch by a plurality of inter-connected suture knots.

15. The recessed mount of claim 5, wherein, The embedded branch is connected with the main body support by at least two fixing portions extending axially along the embedded branch and arranged in the circumferential direction of the main body support, and the wire heads are located between the two fixing portions.

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