Combined support

Abstract

The invention relates to a combined support which comprises a first support body and a second support body, the first support body is provided with a first matching part, the second support body is provided with a second matching part, and the first matching part can enter the second matching part to achieve matched connection of the first support body and the second support body. According to the combined bracket, the first matching part can enter the second matching part to realize the matching of the first bracket and the second bracket, so that the matching strength between the first bracket and the second bracket is enhanced; and the condition that the first stent and the second stent fall off due to blood flow impact and blood vessel pulsation is avoided.

Description

Technical Field

[0001] The present invention relates to the field of interventional medicine, and particularly to a combined stent. Background Art

[0002] With the rising incidence of hypertension, the incidence of artery-related diseases has increased significantly. Among aortic diseases, there are mainly two types of diseases: aortic dissection and aortic aneurysm. Aortic aneurysm and aortic dissection are extremely dangerous diseases, with a mortality rate greater than 50% within 48 hours after onset and greater than 85% within two weeks, which have seriously threatened human health. Thoracic endovascular aortic repair (TEVAR) is a method for treating aortic diseases. A covered stent is used to seal the tear of the vascular dissection or the aneurysm, promote thrombosis, prevent the dissection or aneurysm from rupturing, achieve aortic remodeling, and improve blood supply to the blood vessels.

[0003] Currently, during the minimally invasive interventional treatment of aortic diseases, due to the limitation of the length of the stent delivery system, the length of a single stent cannot be made very long. However, in the treatment of certain diseases, a stent of sufficient length is required to cover the diseased area. Therefore, currently, the method of overlapping two covered stents is usually adopted to extend the stent coverage length. Generally, the diameter of the sleeved stent is selected to be larger than that of the sleeved stent, and the radial supporting force between the two stents is converted into the frictional force between them to ensure the connection and fixation between the two stents. Since the covered stent will be deformed by compression, torsion, bending, etc. under the impact of blood flow and the pulsation of blood vessels after being implanted into the human body, there is a risk of stent detachment for the method of ensuring the connection and fixation between the two stents only by the frictional force between the two stents. Therefore, it is very necessary to improve the reliability of the connection and fixation between the two covered stents. Summary of the Invention

[0004] To overcome the problems existing in the prior art, the present invention provides a combined stent.

[0005] The solution for the present invention to solve the technical problem is to provide that the combined stent includes a first stent and a second stent. The first stent is provided with a first mating portion, and the second stent is provided with a second mating portion. The first mating portion can enter into the second mating portion to realize the mating connection between the first stent and the second stent.

[0006] In some embodiments of the present invention, the first stent has a first film, the second stent has a second film, the first engaging portion includes a connecting member with a free end disposed on the inner or outer side of the first film, the second engaging portion includes a hooking film disposed on the outer or inner side of the second film, the hooking film is locally connected to the second film to form a receiving cavity with an opening, and the free end of the connecting member enters the receiving cavity through the opening to achieve the cooperation between the first stent and the second stent.

[0007] In some embodiments of the present invention, the opening faces the end of the second stent away from the first stent, the free end of the connecting member faces the end of the first stent away from the second stent, the connecting member withdraws after passing through the hooking film, and the free end of the connecting member can enter the receiving cavity through the opening.

[0008] In some embodiments of the present invention, when the first engaging portion includes a connecting member disposed on the inner side of the first film, the free end of the connecting member deflects towards the central axis of the first stent to form an inwardly abutting portion; or when the first engaging portion includes a connecting member disposed on the outer side of the first film, the free end of the connecting member deflects away from the central axis of the first stent to form an outwardly abutting portion.

[0009] In some embodiments of the present invention, the number of the hooking films is multiple, the multiple hooking films are arranged on the second film at intervals along the circumferential direction of the second stent, and the shapes of the multiple hooking films are rectangular and / or triangular and / or semi-circular.

[0010] In some embodiments of the present invention, a connecting member damping structure is provided on the free end of the connecting member, and / or a cavity damping structure is provided in the receiving cavity.

[0011] In some embodiments of the present invention, when the connecting member is disposed on the inner side of the first film, a hooking structure is provided on the surface of the free end of the connecting member facing the central axis direction of the first stent; when the connecting member is disposed on the outer side of the first film, a hooking structure is provided on the surface of the free end of the connecting member away from the central axis direction of the first stent.

[0012] In some embodiments of the present invention, the first mating portion includes a connecting member disposed on the first film, and the second mating portion includes an annular hooking film disposed outside the second film and circumferentially around the second bracket. The hooking film includes a hooking connecting member and a third film. One side of the third film is connected to the outside of the second film, and the other side of the third film is a free end. The hooking connecting member is fixed on the hooking film, and the connecting member can enter between the hooking film and the second film from the free end of the third film to achieve the mating of the first bracket and the second bracket.

[0013] In some embodiments of the present invention, the first mating portion includes a first recess formed by the first bracket recessing toward the central axis of the first bracket, and the second mating portion includes a second recess formed by the second bracket recessing toward the central axis of the second bracket. When the first recess and the second recess overlap, the first bracket and the second bracket complete the mating.

[0014] In some embodiments of the present invention, the first mating portion includes a first recess formed by the first bracket recessing toward the central axis of the first bracket, and the second mating portion includes a second protrusion formed by the second bracket protruding away from the central axis of the second bracket. The first recess and the second protrusion cooperate to achieve the mating of the first bracket and the second bracket.

[0015] Compared with the prior art, a combined bracket of the present invention has the following advantages: the first bracket is provided with a first mating portion, the second bracket is provided with a second mating portion, and the first mating portion can enter the second mating portion to achieve the mating of the first bracket and the second bracket, thereby strengthening the mating strength between the first bracket and the second bracket and avoiding the situation that the first bracket and the second bracket are detached due to the impact of blood flow and the pulsation of blood vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic perspective view of a combined bracket provided by the first embodiment of the present invention.

[0017] Figure 2 is a schematic structural view of the first bracket of the combined bracket provided by the first embodiment of the present invention.

[0018] Figure 3 is a schematic structural view of a deformation example of the combined bracket provided by the first embodiment of the present invention.

[0019] Figure 4 is a schematic perspective view of the combined bracket provided by the first embodiment of the present invention.

[0020] Figure 5 It is a schematic diagram of the connection member and the hook and covering film cooperation of the combined bracket provided by the first embodiment of the present invention.

[0021] Figure 6 It is a schematic diagram of the cooperation between the first bracket and the second bracket of the combined bracket provided by the first embodiment of the present invention.

[0022] Figure 7 It is a schematic diagram of the cooperation process between the first bracket and the second bracket of the combined bracket provided by the first embodiment of the present invention.

[0023] Figure 8 It is a schematic diagram of the completion of the cooperation between the first bracket and the second bracket of the combined bracket provided by the first embodiment of the present invention.

[0024] Figure 9 It is another schematic diagram of the completion of the cooperation between the first bracket and the second bracket of the combined bracket provided by the first embodiment of the present invention.

[0025] Figure 10 It is another schematic diagram of the completion of the cooperation between the first bracket and the second bracket of the combined bracket provided by the first embodiment of the present invention.

[0026] Figure 11 It is a schematic diagram of the structure of the abutting part of the combined bracket provided by the first embodiment of the present invention.

[0027] Figure 12 It is a schematic diagram of the structure of the abutting part of the combined bracket provided by the first embodiment of the present invention.

[0028] Figure 13 It is a schematic three-dimensional structure diagram of the combined bracket provided by the second embodiment of the present invention.

[0029] Figure 14 It is a schematic three-dimensional structure diagram of the combined bracket provided by the third embodiment of the present invention.

[0030] Figure 15 It is a schematic diagram of the cooperation between the first bracket and the second bracket of the combined bracket provided by the third embodiment of the present invention.

[0031] Figure 16 It is a schematic three-dimensional structure diagram of a deformation example of the combined bracket provided by the third embodiment of the present invention.

[0032] Figure 17 It is a schematic diagram of the cooperation structure of a deformation example of the combined bracket provided by the third embodiment of the present invention.

[0033] Figure 18 It is a schematic three-dimensional structure diagram of another deformation example of the combined bracket provided by the third embodiment of the present invention.

[0034] Figure 19 It is a schematic diagram of the mating structure of another variant example of the combined stent provided by the third embodiment of the present invention.

[0035] Explanation of the attached drawing reference numerals: 100, combined stent; 11, first stent; 12, second stent; 111, first bare stent; 112, first film; 121, second bare stent; 122, second film; 113, first mating part; 123, second mating part; 1231, connecting member; 1232, wave crest; 1233, wave trough; 1234, connecting rod; 1131, film-hooking part; 1132, opening; 1235, abutting part; 1236, abutting part; 200, combined stent; 213, first mating part; 212, first film; 2231, connecting member; 223, second mating part; 222, second film; 21, first stent; 22, second stent; 2131, film-hooking part; 2132, film-hooking connecting member; 2133, third film; 300, combined stent; 31, first stent; 32, second stent; 311, first recess; 313, first mating part; 321, second recess; 323, second mating part; 312, first protrusion; 322, second protrusion. Detailed implementation manners

[0036] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0037] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0038] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used in the text. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0039] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such relative relationship terms such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over" and the like. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are to be interpreted accordingly.

[0040] To more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined herein as common terms in the field of interventional medicine. Specifically, the "distal end" refers to the end that is far from the operator during the surgical operation, the "proximal end" refers to the end that is close to the operator during the surgical operation, the "axial direction" refers to its length direction, and the "radial direction" refers to the direction perpendicular to the "axial direction".

[0041] Please refer to Figure 1 and Figure 2, the first embodiment of the present invention provides a combined stent 100. The combined stent 100 includes a first stent 11 and a second stent 12. The first stent 11 and the second stent 12 can be stents for positions such as the aortic arch, thoracic aorta, and abdominal aorta. The first stent 11 and the second stent 12 can be the connection between the main stents or the connection between the main stent and the branch stent. In short, the first stent 11 can also be the second stent 12, and the second stent 12 can also be the first stent 11. The first stent 11 and the second stent 12 are not special in the first embodiment of the present invention, that is, the first stent 11 and the second stent 12 can be any two stents that need to be connected. At the same time, in the first embodiment of the present invention, one first stent 11 and one second stent 12 are taken as examples for detailed description, that is, it represents that the number of the first stent 11 and the second stent 12 can be set according to the actual situation, and multiple first stents 11 and multiple second stents 12 can be combined with each other to form the combined stent 100. The first stent 11 includes a first bare stent 111 and a first film 112, and the first bare stent 111 is fixed on the first film 112. The second stent 12 includes a second bare stent 121 and a second film 122, and the second bare stent 121 is fixed on the second film 122. A first mating portion 113 is provided at the proximal end of the first stent 11, and a second mating portion 123 is provided at the distal end of the second stent 12. The first mating portion 113 can enter the second mating portion 123 to realize the cooperation between the proximal end of the first stent 11 and the distal end of the second stent 12. It should be noted that the first mating portion 113 can be provided at both ends of the first stent 11, and the second mating portion 123 can be provided at both ends of the second stent 12, so that there is no need to specify the release order between the first stent 11 and the second stent 12, nor to pay attention to the directionality of the first stent 11 and the second stent 12.

[0042] Specifically, please refer to Figure 1 , Figure 4 and Figure 5 , in the first embodiment of the present invention, the first bare stent 111 and the second bare stent 121 can be a net structure woven by braided wires, as shown in Figure 3 . The first bare stent 111 and the second bare stent 121 can also be a structure in which a plurality of corrugated rings are spaced apart and then fixed on the first film 112 or the second film 122, as shown in Figure 1 . And the first mating portion 113 is provided at the proximal edge of the first stent 11, and the second mating portion 123 is provided at the distal edge of the second stent 12, as shown in Figure 4As shown. The second mating portion 123 includes a connecting member 1231 disposed outside the second film 122. In the first embodiment of the present invention, the connecting member 1231 is a corrugated ring structure, that is, the connecting member 1231 is a sine wave structure having wave crests 1232, wave troughs 1233, and connecting rods 1234, and the connecting member 1231 is a closed ring structure, and adjacent wave crests 1232 and wave troughs 1233 are connected by the connecting rods 1234. The wave troughs 1233 and the connecting rods 1234 are sutured to the second film 122, and the wave crests 1232 are not sutured, that is, the wave crests 1232 are the free ends of the connecting member 1231. The first mating portion 113 includes a hooking film 1131 disposed inside the first film 112, and the hooking film 1131 has an opening 1132 facing the proximal end of the first stent. The number of the hooking films 1131 is multiple, and the number of the hooking films 1131 corresponds to the number of the wave crests 1232. The multiple hooking films 1131 are formed by separating a single film by suturing, that is, on the basis of a single film, the proximal partial film is sutured to the first film 112, and a part of the distal end of the film is not sutured to form a receiving cavity (not shown in the figure) having the opening 1132. This structure having the opening 1132 and the receiving cavity is the hooking film 1131. At the same time, the shape of the hooking film 1131 is a triangle. During the operation, if the first stent 11 is the stent to be released first and the second stent 12 is the stent to be released later, then the first stent 11 is first released at the lesion site, and then the distal end of the second stent 12 is delivered to the proximal inner side of the first stent 11, and then the distal end of the second stent 12 is released. Subsequently, the second stent 12 is slightly pushed in the direction of the first stent 11, so that the wave crests 1232 of the connecting member 1231 that are not sutured, that is, the free ends of the connecting member 1231, enter the receiving cavity through the opening 1132 to complete the cooperation between the wave crests 1232 and the hooking film 1131. The multiple wave crests 1232 correspond to the multiple hooking films 1131 one by one, such as Figure 5As shown. Subsequently, the second stent 12 is completely released. After the release, the wave crest 1232 will be firmly stuck in the hooked film 1131 due to expansion, thereby strengthening the cooperation strength between the first stent 11 and the second stent 12, and avoiding the situation that the first stent 11 and the second stent 12 fall off due to blood flow impact and blood vessel pulsation. The combined stent 100 of the present invention is also particularly suitable for being released in a blood vessel with a tumor. This is because when the stent is in a blood vessel with a tumor, it cannot be squeezed and supported by the blood vessel, so that only the friction between two or more stents can be relied on to maintain the connected state. This friction is small and is easily affected by blood flow impact and blood vessel pulsation, resulting in the loss of connection between two or more stents, and thus the stent falls off. By providing the first cooperation part 113 and the second cooperation part 123, the combined stent 100 enables the first stent 11 and the second stent 12 to interact with each other, and their cooperation is more stable. Even when the combined stent 100 is at the position of the tumor, the first stent 11 and the second stent 12 can ensure the stability of the connection by virtue of the mutual acting force between them.

[0043] It should be noted that when the first stent 11 is the stent to be released first and the second stent 12 is the stent to be released later, the first engaging portion 113 is disposed inside the first film 112, and the second engaging portion 123 is disposed outside the second film 122. When the second stent 12 is the stent to be released first and the first stent 11 is the stent to be released later, the second engaging portion 123 is disposed inside the second film 122, and the first engaging portion 113 is disposed outside the first film 112. When the first engaging portion 113 is the connecting member 1231 and the second engaging portion 123 is the hooking film 1131, the trough 1233 of the connecting member 1231 is not sutured to the first film 112, that is, the trough 1233 is the free end of the connecting member 1231. The peak 1232 and a part of the connecting rod 1234 can be sutured to the first film 112, and the hooking film 1131 is locally connected to the second film 122 to form a receiving cavity having an opening 1132. The opening 1132 of the hooking film 1131 is disposed toward the distal end. During cooperation, the trough 1233 enters the receiving cavity through the opening 1132, thereby completing the cooperation between the trough 1233 and the hooking film 1131. Further, since the shape of the hooking film 1131 is triangular, even if the peak 1232 or the trough 1233 is not directly opposite to the hooking film 1131, the peak 1232 or the trough 1233 can slide into the hooking film 1131 along the edge of the hooking film 1131, thereby greatly reducing the difficulty of cooperation between the first stent 11 and the second stent 12. At the same time, the stability of the cooperation between the connecting member 1231 and the hooking film 1131 depends on how much the connecting member 1231 enters the hooking film 1131. The more the part of the connecting member 1231 that enters the hooking film 1131, the stronger the stability of the cooperation between the connecting member 1231 and the hooking film 1131. And how much the connecting member 1231 can enter the hooking film 1131 depends on the unsutured part of the connecting member 1231 and the depth S of the hooking film 1131. For example, when the depth S of the hooking film 1131 is deep enough, if the peak 1232 and a part of the connecting rod 1234 are not sutured, the peak 1232 and a part of the unsutured connecting rod 1234 can enter the hooking film 1131. It should also be noted that if too much of the connecting member 1231 is not sutured, the connecting member 1231 cannot be stably fixed to the second film 122, and the connecting member 1231 may be warped or shaken, etc., resulting in the connecting member 1231 being unable to cooperate with the hooking film 1131.Therefore, in the first embodiment of the present invention, in order to balance the stability of the connecting member 1231 on the second film 122 and the stability of the cooperation between the connecting member 1231 and the hook film 1131, the wave crest 1232 and half of the connecting rod 1234 close to the wave crest 1232 are not sutured, and the depth S of the hook film 1131 is greater than the axial distance L of the wave crest 1232 and half of the connecting rod 1234, so that the wave crest 1232 and half of the connecting rod 1234 can enter the hook film 1131.

[0044] In other specific embodiments of the present invention, the first engaging portion 113 can be disposed at any position on the first bracket 11 according to the usage requirements, and the second engaging portion 123 can also be disposed at any position on the second bracket 12 according to the usage requirements. For example, the first engaging portion 113 can be disposed at a position near the end of the first bracket 11, and the second engaging portion 123 can be disposed at a position near the end of the second bracket 12. The number of the first engaging portions 113 and the second engaging portions 123 can also be multiple, and the multiple first engaging portions 113 are in one-to-one correspondence and cooperation with the multiple second engaging portions 123, thereby further enhancing the stability of the connection between the first bracket 11 and the second bracket 12. At the same time, when the first bracket 11 is released first and the second bracket 12 is released later, the first engaging portion 113 can also be a connecting member 1231 disposed inside the first film 112, and the second engaging portion 123 can be a hooking film 1131 disposed outside the second film 122. When the second bracket 12 is released first and the first bracket 11 is released later, the first engaging portion 113 can be a connecting member 1231 disposed outside the first film 112, the second engaging portion 123 is a hooking film 1131 disposed inside the second film 122, or the first engaging portion 113 is the hooking film 1131 disposed outside the first film 112, and the second engaging portion 123 is the connecting member 1231 disposed inside the second film 122. That is, the first engaging portion 113 and the second engaging portion 123 can be adaptively set as the hooking film 1131 or the connecting member 1231 according to the actual situation, and the first engaging portion 113 and the second engaging portion 123 can also be adaptively disposed inside or outside the first film 112 and the second film 122 according to the actual situation. The hooking film 1131 can also be an individual, that is, each hooking film 1131 is formed by separately sewing a film, and a plurality of hooking films 1131 are arranged in a circle. Or the hooking film 1131 is provided with a bottom film, a plurality of hooking films 1131 are sewn on the bottom film, and then the bottom film is connected to the first film 112 or the second film 122. The shape of the hooking film 1131 can also be rectangular, fan-shaped, semi-circular, etc.

[0045] Further, please refer to Figure 6, to further ensure the fitting stability of the first fitting portion 113 and the second fitting portion 123, when the first stent 11 is the stent released first and the second stent 12 is the stent released later. The first fitting portion 113 is a hooking film 1131 provided inside the first film 112, and the second fitting portion 123 is a connecting member 1231 provided outside the second film 122. The opening 1132 of the hooking film 1131 faces the distal end, and the trough 1233 of the connecting member 1231 is not sutured, while the peak 1232 of the connecting member 1231 and a part of the connecting rod 1234 are sutured. After releasing the first stent 11, the distal end of the second stent 12 is inserted into the proximal end of the first stent 11, and the second fitting portion 123 of the second stent 12 is made to cross over the first fitting portion 113 of the first stent 11, as Figure 7 shown. Subsequently, the second stent 12 is released. Since the second stent 12 will be affected by the retraction of the sheath tube during release, the second stent 12 will retract slightly, just enabling the trough 1233 to enter the hooking film 1131 through the opening 1132, as Figure 8 shown. Or the first fitting portion 113 is a connecting member 1231 provided inside the first film 112, and the second fitting portion 123 is a hooking film 1131 provided outside the second film 122. The peak 1232 of the connecting member 1231 is not sutured to the first film 112, while the trough 1233 and a part of the connecting rod 1234 are sutured to the first film 112. The opening 1132 of the hooking film 1131 faces the proximal end. After releasing the first stent 11, the distal end of the second stent 12 is inserted into the proximal end of the first stent 11, and the second fitting portion 123 of the second stent 12 is made to cross over the first fitting portion 113 of the first stent 11. Subsequently, the second stent 12 is released. Since the second stent 12 will be affected by the retraction of the sheath tube during release, the second stent 12 will retract slightly, just enabling the hooking film 1131 to be hooked on the peak 1232 through the opening 1132, as Figure 9 shown.

[0046] Please refer to Figure 9, when the second stent 12 is the first-released stent and the first stent 11 is the second-released stent, the second engaging portion 123 is a connecting member 1231 disposed inside the second film 122, the first engaging portion 113 is a hooking film 1131 disposed outside the first film 112, the peak 1232 of the connecting member 1231 is not sutured to the second film 122, and the opening 1132 of the hooking film 1131 faces the proximal end. After the second stent 12 is released, the first stent 11 is passed through the second stent 12, and after the first engaging portion 113 passes over the second engaging portion 123, the first stent 11 is released. Since the first stent 11 will be affected by the retraction of the sheath during release, the first stent 11 will retract slightly, just making the hooking film 1131 hang on the peak 1232 through the opening 1132. Or the second engaging portion 123 is a hooking film 1131 disposed inside the second film 122, the first engaging portion 113 is a connecting member 1231 disposed outside the first film 112, the opening of the hooking film 1131 faces the distal end, and the trough 1233 of the connecting member 1231 is not sutured to the first film 112. After the second stent 12 is released, the first stent 11 is passed through the second stent 12, and after the first engaging portion 113 passes over the second engaging portion 123, the first stent 11 is released. Since the first stent 11 will be affected by the retraction of the sheath during release, the first stent 11 will retract slightly, just making the trough 1233 enter the hooking film 1131 through the opening 1132, as Figure 10 shown. By cooperating in the above manner, the relative movement of the first stent 11 and the second stent 12 away from each other is restricted, greatly improving the cooperation strength and stability of the first stent 11 and the second stent 12, and avoiding the situation where the first stent 11 and the second stent 12 lose their cooperation due to blood flow impact and blood vessel pulsation.

[0047] Please refer to Figure 6 and Figure 11, to ensure that the connecting member 1231 can smoothly enter the hooked film 1131. When the first mating portion 113 or the second mating portion 123 includes a connecting member 1231 provided on the inner side of the first film 112 or the second film 122, the proximal end of the connecting member 1231 on the inner side of the first film 112 deflects towards the central axis of the first bracket 11 to form a resisting portion 1235, or the distal end of the connecting member 1231 on the inner side of the second film 122 deflects towards the central axis of the second bracket 12 to form a resisting portion 1235. During the cooperation between the first mating portion 113 and the second mating portion 123, when the resisting portion 1235 is on the inner side of the first film 112, the resisting portion 1235 will continuously resist the outer side of the second film 122, thereby ensuring that the resisting portion 1235 can smoothly enter the hooked film 1131 provided on the outer side of the second film 122, and further enabling the connecting member 1231 to smoothly enter the hooked film 1131. When the resisting portion 1235 is on the inner side of the second film 122, the resisting portion 1235 will continuously resist the outer side of the first film 112, thereby ensuring that the resisting portion 1235 can smoothly enter the hooked film 1131 provided on the outer side of the first film 112, and further enabling the connecting member 1231 to smoothly enter the hooked film 1131. It can be understood that the opening 1132 is not flush with the edge of the first bracket 11 or the second bracket 12, that is, the opening 1132 should at least be spaced a certain distance from the edge of the first bracket 11 and the second bracket 12, so as to ensure that the resisting portion 1235 will first contact the first film 112 or the second film 122, and then ensure that the resisting portion 1235 can continuously resist the first film 112 or the second film 122. The included angle range between the resisting portion 1235 and the central axis of the first bracket 11 or the second bracket 12 is 0 degree - 90 degrees.

[0048] Please refer to Figure 6 and Figure 12When the first engaging portion 113 or the second engaging portion 123 includes a connecting member 1231 disposed outside the first film 112 or the second film 122, the proximal end of the connecting member 1231 outside the first film 112 deflects away from the central axis of the first bracket 11 to form an abutting portion 1236, or the distal end of the connecting member 1231 outside the second film 122 deflects toward the central axis of the second bracket 12 to form an abutting portion 1236. During the cooperation process of the first engaging portion 113 and the second engaging portion 123, when the abutting portion 1236 is outside the first film 112, the abutting portion 1236 continuously abuts against the inner side of the second film 122, thereby ensuring that the abutting portion 1236 can smoothly enter the hook film 1131 disposed inside the second film 122, and further enabling the connecting member 1231 to smoothly enter the hook film 1131. When the abutting portion 1236 is outside the second film 122, the abutting portion 1236 continuously abuts against the inner side of the first film 112, thereby ensuring that the abutting portion 1236 can smoothly enter the hook film 1131 disposed inside the first film 112, and further enabling the connecting member 1231 to smoothly enter the hook film 1131. The included angle range between the abutting portion 1236 and the central axis of the first bracket 11 or the second bracket 12 is 0 degree - 90 degrees.

[0049] It can be understood that the connecting piece 1231 or the hook coating 1131 can be provided on the outer sides of the first coating 112 and the second coating 122, and the hook coating 1131 or the connecting piece 1231 can be provided on the inner sides of the first coating 112 and the second coating 122; or the connecting piece 1231 or the hook coating 1131 can be provided on both the inner and outer sides of the first coating 112, and the hook coating 1131 or the connecting piece 1231 can be provided on the inner and outer sides of the second coating 122, so that there is no need to pay attention to the release order of the first bracket 11 and the second bracket 12. No matter which of the first bracket 11 and the second bracket 12 is released first or later, the cooperation between the connecting piece 1231 and the hook coating 1131 can be achieved. In order to facilitate the observation of the connecting member 1231 and the hook coating 1131, a developing ring (not shown) can be set on the connecting member 1231 and the hook coating 1131, so as to more accurately judge the position of the connecting member 1231 and the hook coating 1131 in the body, and ensure the accuracy of the matching of the connecting member 1231 and the hook coating 1131. The abutting portion 1235 or the abutting portion 1236 can be formed by the inward concave or outward warping of the crest 1232 or the trough 1233 itself, and the number of the abutting portion 1235 or the abutting portion 1236 is consistent with the number of the crest 1232 or the trough 1233. A plurality of the abutting portions 1235 or the abutting portions 1236 can also be set on one crest 1232 or trough 1233, and the number of the abutting portions 1235 or the abutting portions 1236 can be adaptively set according to actual use requirements.

[0050] Further, to increase the fastening degree after the cooperation between the first engaging portion 113 and the second engaging portion 123, a damping structure of the connecting member (not shown in the figure) may be provided at the free end of the connecting member 1231. The damping structure of the connecting member can increase the friction coefficient of the free end of the connecting member 1231, thereby increasing the frictional force between the connecting member 1231 and the hook film 1131. Similarly, a damping structure inside the cavity (not shown in the figure) may also be provided in the receiving cavity of the hook film 1131. The damping structure inside the cavity can increase the friction coefficient of the inner surface of the receiving cavity, thereby increasing the frictional force between the connecting member 1231 and the hook film 1131. Specifically, the damping structure of the connecting member may be a suture. The suture is wound around the free end of the connecting member 1231, that is, the suture is wound on the wave crest 1232 or the wave trough 1233, increasing the frictional force between the connecting member 1231 and the hook film 1131, thereby increasing the fastening degree after the cooperation between the first engaging portion 113 and the second engaging portion 123. The damping structure of the connecting member may also be a film. A film is covered on the free end of the connecting member 1231. For example, a film made of PTFE material is covered on the free end of the connecting member 1231. Since such materials themselves have a relatively high friction coefficient, covering the free end of the connecting member 1231 with a film can also increase the frictional force between the connecting member 1231 and the hook film 1131, thereby increasing the fastening degree after the cooperation between the first engaging portion 113 and the second engaging portion 123. The damping structure inside the cavity may be a wavy fold provided in the receiving cavity. This fold may be a fold formed by folding the receiving cavity body, or a film with folds may be provided separately, and then this film with folds is sewn on the inner surface of the receiving cavity. Thereby increasing the resistance to be overcome when the connecting member 1231 and the hook film 1131 are disengaged. The damping structure inside the cavity may also be a suture sewn in the receiving cavity, making the suture protrude from the inner wall of the receiving cavity, thereby increasing the resistance to be overcome when the connecting member 1231 and the hook film 1131 are disengaged. In addition, a hooking structure (not shown in the figure) may be provided on the connecting member 1231. The hooking structure includes barbs, hooks, etc. After the connecting member 1231 and the hook film 1131 are engaged, the hooking structure directly hooks in the receiving cavity, thereby increasing the fastening degree after the cooperation between the first engaging portion 113 and the second engaging portion 123. It should be noted that when the connecting member 1231 is provided inside the first film 112 or the second film 122, a hooking structure is provided on the surface of the free end of the connecting member 1231 facing the central axis direction of the first bracket 11 or the second bracket 12.When the connecting member 1231 is disposed outside the first film 112 or the second film 122, a hooking structure is provided on a surface of the free end of the connecting member 1231 facing away from the central axis direction of the first bracket 11 and the second bracket 12.

[0051] Please refer to Figure 13 , a second embodiment of the present invention provides a combined stent 200. The main difference between the combined stent 200 and the combined stent 100 of the first embodiment is that: the first engaging portion 213 includes a connecting member 2231 disposed inside the first film 212, and the second engaging portion 223 includes an annular hooking film 2131 disposed outside the second film 222 and surrounding the second bracket 22 in a circumferential direction. The hooking film 2131 includes a hooking connecting member 2132 and a third film 2133. One side of the third film 2133 is connected to the outside of the second film 222, and the other side of the third film 2133 is a free end. The hooking connecting member 2132 is fixed on the hooking film 2131. The connecting member 2231 disposed on the first bracket 21 can enter the hooking film 2131 from the free end of the third film 2133 disposed on the second bracket 22 to achieve the cooperation between the proximal end of the first bracket 21 and the distal end of the second bracket 22. Or the hooking film 2131 is disposed inside the first film 212. One side of the third film 2133 is connected to the inside of the first film 212, and the other side of the third film 2133 is a free end. The connecting member 2231 disposed on the second bracket 22 can enter the hooking film 2131 from the free end of the third film 2133 disposed on the first bracket 21 to achieve the cooperation between the proximal end of the first bracket 21 and the distal end of the second bracket 22. It can be understood that the free end of the third film 2133 can face the proximal end or the distal end, and the opening of the hooking film 2131 is set corresponding to the orientation of the free end. The specific setting method and principle are the same as those of the first embodiment and will not be described herein again. Through the above method, the proximal end of the first bracket 21 and the distal end of the second bracket 22 can be more simply and intuitively cooperated. At the same time, the hooking film 2131 is provided with a hooking connecting member 2132, which can improve the supporting force of the first bracket 21 and the second bracket 22, enhance the anchoring force of the first bracket 21 or the second bracket 22 on the blood vessel, and also enhance the anchoring force of the cooperation between the first bracket 21 and the second bracket 22.

[0052] Please refer to Figure 14-15. The third embodiment of the present invention provides a combined bracket 300. The main difference between the combined bracket 300 and the combined bracket 100 of the first embodiment is that: the first engaging portion 313 includes a first recessed portion 311 formed by the first bracket 31 recessing towards the central axis direction of the first bracket 31, and the second engaging portion 323 includes a second recessed portion 321 formed by the second bracket 32 recessing towards the central axis direction of the second bracket 32. When the first recessed portion 311 overlaps with the second recessed portion 321, the first bracket 31 and the second bracket 32 complete the engagement.

[0053] It can be understood that the first recessed portion 311 and the second recessed portion 321 can be circular, linear, triangular, etc. The first recessed portion 311 and the second recessed portion 321 can also be an annular structure surrounding the first bracket 31 and the second bracket 32 for one week. There is no need to pay attention to the release order of the first bracket 31 and the second bracket 32. When the first bracket 31 is released first and the second bracket 32 is released later, the first recessed portion 311 is on the outside of the second recessed portion 321. When the second bracket 32 is released first and the first bracket is released later, the second recessed portion 321 is on the outside of the first recessed portion 311. Through the cooperation of the first recessed portion 311 and the second recessed portion 321, the friction force between the first recessed portion 311 and the second recessed portion 321 is increased, thereby improving the engagement strength and stability of the first bracket 31 and the second bracket 32.

[0054] Please refer to Figure 16-19. In other specific embodiments of the present invention, the first recess 311 can also be replaced with a first protrusion 312 formed by protruding away from the central axis of the first bracket 31. The second bracket 32 is still provided with a second recess 321. At this time, the second bracket 32 needs to be released first, and then the first bracket 31 is conveyed into the second bracket 32, and the first protrusion 312 is moved over the second recess 321. Then the first bracket 31 is released. At this time, the first protrusion 312 abuts against the second recess 321, thereby restricting the first bracket 31 and the second bracket 32 from moving away from each other, and thus improving the cooperation strength and stability between the first bracket 31 and the second bracket 32. Or the second recess 321 can be replaced with a second protrusion 322 formed by protruding away from the central axis of the second bracket 32. The first bracket 31 is still provided with a first recess 311. At this time, the first bracket 31 needs to be released first, and then the second bracket 32 is conveyed into the first bracket 31, and the second protrusion 322 is moved over the first recess 311. Then the second bracket 32 is released. At this time, the second protrusion 322 abuts against the first recess 311, thereby restricting the first bracket 31 and the second bracket 32 from moving away from each other, and thus improving the cooperation strength and stability between the first bracket 31 and the second bracket 32.

[0055] Compared with the prior art, a combined bracket of the present invention has the following advantages: the first engaging portion can enter the second engaging portion to realize the cooperation between the proximal end of the first bracket and the distal end of the second bracket, thereby enhancing the cooperation strength between the first bracket and the second bracket, and avoiding the situation that the first bracket and the second bracket fall off due to blood flow impact and vascular pulsation.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A combined bracket, characterized in that: the combined bracket includes a first bracket and a second bracket. The first bracket is provided with a first engaging portion, and the second bracket is provided with a second engaging portion. The first engaging portion can enter the second engaging portion to achieve the fitting connection between the first bracket and the second bracket.

2. The combined bracket according to claim 1, characterized in that: the first bracket has a first film, and the second bracket has a second film. The first engaging portion includes a connecting member with a free end disposed on the inner or outer side of the first film. The second engaging portion includes a hooking film disposed on the outer or inner side of the second film. The hooking film is locally connected to the second film to form a receiving cavity with an opening. The free end of the connecting member enters the receiving cavity through the opening to achieve the fitting between the first bracket and the second bracket.

3. The combined bracket according to claim 2, characterized in that, the opening faces the end of the second bracket away from the first bracket, the free end of the connecting member faces the end of the first bracket away from the second bracket, the connecting member withdraws after passing through the hooking film, and the free end of the connecting member can enter the receiving cavity through the opening.

4. The combined bracket according to claim 2, characterized in that: when the first engaging portion includes a connecting member disposed on the inner side of the first film, the free end of the connecting member deflects towards the central axis of the first bracket to form an inward abutting portion; or when the first engaging portion includes a connecting member disposed on the outer side of the first film, the free end of the connecting member deflects away from the central axis of the first bracket to form an outward abutting portion.

5. The combined bracket according to claim 2, characterized in that: the number of the hooking films is multiple, and the multiple hooking films are arranged on the second film at intervals along the circumferential direction of the second bracket. The shapes of the multiple hooking films are rectangular and / or triangular and / or semi-circular.

6. The combined bracket according to claim 2, characterized in that: a connecting member damping structure is provided on the free end of the connecting member, and / or a cavity damping structure is provided in the receiving cavity.

7. The combined bracket according to claim 2, characterized in that: when the connecting member is disposed on the inner side of the first film, a hooking structure is provided on the surface of the free end of the connecting member facing the central axis direction of the first bracket; when the connecting member is disposed on the outer side of the first film, a hooking structure is provided on the surface of the free end of the connecting member away from the central axis direction of the first bracket.

8. The combined bracket according to claim 1, characterized in that: The first mating part includes a connecting member disposed on the first film layer. The second mating part includes an annular hooking film layer disposed outside the second film layer and surrounding the second bracket in a circumferential direction. The hooking film layer includes a hooking connecting member and a third film layer. One side of the third film layer is connected to the outside of the second film layer, and the other side of the third film layer is a free end. The hooking connecting member is fixed on the hooking film layer. The connecting member can enter between the hooking film layer and the second film layer from the free end of the third film layer to achieve the mating of the first bracket and the second bracket.

9. The combined bracket according to claim 1, wherein: the first mating part includes a first recessed part formed by the first bracket recessing towards the central axis direction of the first bracket, and the second mating part includes a second recessed part formed by the second bracket recessing towards the central axis direction of the second bracket. When the first recessed part and the second recessed part overlap, the first bracket and the second bracket complete the mating.

10. The combined bracket according to claim 1, wherein: the first mating part includes a first recessed part formed by the first bracket recessing towards the central axis direction of the first bracket, and the second mating part includes a second protruding part formed by the second bracket protruding away from the central axis direction of the second bracket. The first recessed part and the second protruding part are mated to achieve the mating of the first bracket and the second bracket.

Images