Multi-channel mesh stent and stent assembly
Through the multi-channel grid bracket woven with superelastic metal or alloy monofilament interwoven, the problems of easy internal leakage, easy clamping and size mismatch of the bracket in the prior art are solved, and more stable blood flow paths and shorter Preparation time for surgery.
Patent Information
- Application Number
- CN202323277693.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-01
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-01
AI Technical Summary
In the prior art, stents with branched blood vessels are prone to problems such as internal leakage, clamping and size mismatch during implantation, resulting in poor treatment results, and products of different specifications need to be customized to suit patients with different blood vessel sizes. Extended the preparation time for surgery.
Using a multi-channel mesh bracket woven from superelastic metal or alloy monofilament interlaced, including a cylindrical body bare bracket and branch bare bracket, connected by a braided mesh structure to provide support and adapt to different blood vessel diameters to avoid internal leakage and Clip while adjusting the length to adapt to different sizes of blood vessels.
It effectively avoids internal leakage and clamping problems, provides better blood flow paths, and does not require customized stents before surgery, shortens the preparation time for surgery, and is suitable for patients with different blood vessel sizes.
Smart Images
Figure CN222172386U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a multi-channel grid bracket and a bracket component. Background Art
[0002] In the prior art, if a lesion occurs at a location with a branched blood vessel, the lesioned blood vessel is usually treated by implanting a main stent in combination with a branch stent to support the lesioned blood vessel and establish a blood flow channel.
[0003] The stents used are mainly divided into: split stents and integrated stents. For split stents, the main stent is provided with holes for the branch stents to pass through. The main stent is implanted first, and the position of the hole in the main stent should be aligned with the opening of the branch blood vessel. The branch stent is implanted into the branch blood vessel through the hole in the main stent. For integrated stents, the main stent and the split stent are made into an integrated structure and implanted as a whole.
[0004] The two types of stents in the prior art are mostly wire-wound stents as the skeleton, with a polyester film on the outer layer, wherein:
[0005] The disadvantage of the split-type stent is that the wire-wound stent is arranged in segments, and the branch stent and the main stent hole position need to be well matched. If the position where the branch stent contacts the main body hole after implantation happens not to have stent support, that is, the coating contacts the coating, type III endoleak will occur; in addition, another disadvantage of this type of stent is that the branch stent is easily displaced when the branch blood vessels are often in an active state.
[0006] For one-piece stents, although the above-mentioned Type III endoleak will not occur, the patient's main blood vessels and branch blood vessels are often arranged at an angle, and the angle between the two is usually not a right angle. When the angle between the branch blood vessels and the main blood vessels is irregular and the branch blood vessels are relatively tortuous, since there is no skeleton connection between the branch stent and the main stent (connected by a membrane), the connection between the main body of this type of stent and the branch stent will be clamped, blocking the blood flow in the branch blood vessels. In addition, another disadvantage of this type of stent is that the stent and the membrane occupy a large space and are not suitable for narrow blood vessels, such as the combined implantation of the abdominal aorta and the renal artery.
[0007] In addition, no matter which of the above-mentioned stents in the prior art is used, the sizes of the main stent and the branch stent are fixed, while the sizes of the main blood vessels and branch blood vessels of different patients vary greatly. It is necessary to develop products of multiple specifications to accommodate patients with different blood vessel sizes. Customization is required before use, which greatly prolongs the surgical preparation time. Utility Model Content
[0008] The purpose of the utility model is to provide a multi-channel grid stent and a stent assembly to alleviate the above-mentioned technical problems existing in the prior art coated stents including a main stent and a branch stent.
[0009] To achieve the above purpose, the embodiment of the utility model adopts the following technical solutions:
[0010] A first aspect of an embodiment of the utility model provides a multi-channel grid stent, comprising a bare stent woven into an integral structure by interlacing superelastic metal or alloy monofilaments, the bare stent comprising a tubular main body bare stent and at least one tubular branch bare stent, and: one end of the branch bare stent branches out in the circumferential direction from between the two ends of the main body bare stent.
[0011] The utility model alleviates the technical problems of the existing surgical stent including the main stent and the branch stent, such as easy internal leakage, easy clamping, and multiple specifications.
[0012] In some optional implementations of this embodiment, preferably, the braided mesh density at the connection portion between the main bare stent and the branch bare stent is smaller than the braided mesh density of the main bare stent.
[0013] In some optional embodiments, the branch bare stent includes at least one.
[0014] In some optional embodiments, the branch bare stents include at least two and are spaced apart from each other.
[0015] In some optional embodiments, the number of edges of the woven mesh unit at the connection portion between the main bare stent and the branch bare stent is greater than or equal to the number of edges of the woven mesh unit of the main bare stent, and the number of edges of the woven mesh unit at the connection portion between the main bare stent and the branch bare stent is greater than or equal to the number of edges of the woven mesh unit of the branch bare stent.
[0016] In some optional embodiments, the number of sides of the woven mesh unit of the main bare stent is equal to the number of sides of the woven mesh unit of the branch bare stent, for example but not limited to, the hollowing out at all places on the circumference of the stent is a four-sided diamond grid.
[0017] In some optional embodiments, a main body bare stent is provided with a main body covering on its circumference, wherein the main body covering covers the circumference of the main body bare stent in whole or in part; in some optional embodiments, a branch bare stent is provided with a branch covering on its circumference, wherein the branch covering covers the circumference of the branch bare stent in whole or in part.
[0018] A second aspect of the present embodiment further provides a stent assembly, comprising a cylindrical main stent graft and the multi-channel grid stent described in any of the aforementioned optional embodiments, wherein:
[0019] In one structure: in the implanted state, the main bare stent of the multi-channel grid stent is sleeved on the outside of the main coated stent;
[0020] In another structure: the main coated stent is provided with windows on its circumferential surface, and in the implanted state, the main bare stent of the multi-channel grid stent is supported inside the main coated stent, and the branch bare stent extends out of the main coated stent from the windows.
[0021] The beneficial effects that can be achieved by the bracket assembly provided in this embodiment can be obtained by referring to the multi-channel grid bracket provided in the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 A schematic diagram of a first optional structure of a multi-channel grid support provided in an embodiment of the utility model Figure 1 ;
[0024] Figure 2 A schematic diagram of a first optional structure of a multi-channel grid support provided in an embodiment of the utility model Figure 2 ;
[0025] Figure 3 for Figure 1 A schematic diagram of an application method of the multi-channel grid stent shown;
[0026] Figure 4 A schematic diagram of a second optional structure of a multi-channel grid support provided in an embodiment of the utility model;
[0027] Figure 5 for Figure 4 A schematic diagram of an application method of the multi-channel grid stent shown;
[0028] Figure 6 A schematic diagram of a third optional structure of a multi-channel grid support provided in an embodiment of the utility model;
[0029] Figure 7 for Figure 6 A schematic diagram of an optional application of the multi-channel grid support shown;
[0030] Figure 8 A schematic diagram of an optional structure of a bracket assembly provided in an embodiment of the utility model;
[0031] Fig. 9 A schematic diagram of another optional structure of the bracket assembly provided in an embodiment of the utility model.
[0032] Icon: 1-main bare stent; 2-branch bare stent; 3-main covered stent. DETAILED DESCRIPTION
[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0035] It should be noted that like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0036] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0037] Embodiment 1
[0038] This embodiment provides a multi-channel grid stent, referring to Figures 1 to 7 The multi-channel grid stent includes a bare stent that is woven into an integral structure by interlacing superelastic metal or alloy monofilaments (preferably superelastic memory alloy monofilaments), and the bare stent includes a cylindrical main bare stent 1 and at least one cylindrical branch bare stent 2, and: one end of the branch bare stent 2 is separated from the circumferential direction between the two ends of the main bare stent 1.
[0039] The utility model alleviates the technical problems of the existing surgical stent including the main stent and the branch stent, such as easy internal leakage, easy clamping, and multiple specifications.
[0040] Specifically, firstly, the skeleton part of the multi-channel mesh stent is woven from monofilaments into an integrated structure of a main bare stent and a branch bare stent. When there is a coating at the connection between the main bare stent and the branch bare stent, there will be no problem of bleeding at the connection, nor will there be any problem of displacement of the branch bare stent relative to the main bare stent. Secondly, the non-coated connection between the main bare stent and the branch bare stent is a real skeleton structure with supporting force, so that it has supporting force after implantation and there will be no problem of clamping at the connection. In addition, its overall mesh structure can be suitable for patients with more blood vessel diameters. The mesh stent can produce changes in diameter by adjusting its own length, thereby adapting to blood vessels of different sizes. Therefore, there is no need to customize the stent before surgery, which shortens the preparation time before surgery.
[0041] In some optional implementations of the present embodiment, preferably, the density of the braided mesh at the connection between the main bare stent 1 and the branch bare stent 2 is smaller than the density of the braided mesh of the main bare stent 1, thereby further improving the skeleton supporting force at the connection between the main bare stent 1 and the branch bare stent 2, and further preventing blood leakage when a coating is provided.
[0042] In this embodiment, there is no specific restriction on the number of branch bare stents 2 and the angle between each branch bare stent 2 and the main bare stent 1; for example:
[0043] In some optional embodiments, the branch bare stent 2 includes at least one, and when there is one, its structure is as follows: Figure 1 and Figure 2 shown.
[0044] In some optional embodiments, the branch bare stent 2 includes at least two and each of them is spaced apart from each other. When there are two, the structure can be as follows: Figure 4 or Figure 6 As shown, the branch bare stents 2 can be symmetrical relative to the central axis of the main bare stent 1, or can be arranged at intervals along the axial direction of the main bare stent 1, or can be arranged in other ways.
[0045] In some optional implementations of the present embodiment, the number of edges of the woven mesh unit at the connection portion between the main bare bracket 1 and the branch bare bracket 2 is greater than or equal to the number of edges of the woven mesh unit of the main bare bracket 1, and the number of edges of the woven mesh unit at the connection portion between the main bare bracket 1 and the branch bare bracket 2 is greater than or equal to the number of edges of the woven mesh unit of the branch bare bracket 2. The structure is embodied as follows: the number of wire heads at one end of the branch bare bracket 2 is connected one-to-one with the number of wire heads at the side connection port of the main bare bracket 1 when the same, and when different, that is, as in the structure of the present optional implementation, refer to Figure 1 and Figure 2 As shown in the structure in the dotted circle, the connection is achieved by increasing the number of sides of the mesh unit woven at the connection. The woven structure is different from the forking from the end of the main bare stent 1. The side forking structure is easier to obtain and is not affected by the number of wave peaks at the end of the main bare stent 1.
[0046] In some optional embodiments, the number of edges of the woven mesh unit of the main bare stent 1 is equal to the number of edges of the woven mesh unit of the branch bare stent 2.
[0047] In some optional embodiments, a main bare stent 1 is provided with a main covering on its circumference, wherein the main covering entirely or partially covers the circumference of the main bare stent 1; in some optional embodiments, a branch bare stent 2 is provided with a branch covering on its circumference, wherein the branch covering entirely or partially covers the circumference of the branch bare stent 2. Selective covering according to the actual situation of the patient can not only establish a blood flow path, but also ensure blood supply to other branch vessels.
[0048] Embodiment 2
[0049] refer to Figure 8 and Fig. 9 This embodiment provides a stent assembly, including a main stent graft 3 and a multi-channel grid stent of any optional embodiment in the first embodiment, wherein:
[0050] In a structure: Figure 8 As shown, the main stent graft 3 is cylindrical, and in the implanted state, the main bare stent 1 of the multi-channel grid stent is sleeved on the outside of the main stent graft 3; at this time, the main stent graft 3 can be but is not limited to an abdominal aortic prosthesis, used for the treatment of abdominal aortic aneurysm involving the renal artery.
[0051] In another structure: Fig. 9 As shown, the main coated stent 3 is cylindrical and has windows on its circumference. In the implanted state, the main bare stent 1 of the multi-channel grid stent is supported inside the main coated stent 3, and the branch bare stent 2 extends out of the main coated stent 3 from the window; at this time, the main coated stent 3 can be but is not limited to a thoracic aorta prosthesis, which is used for the treatment of thoracic aorta lesions and other vascular diseases involving branch arteries.
[0052] The beneficial effects that can be achieved by the bracket assembly provided in this embodiment can be obtained by referring to the multi-channel grid bracket provided in the first embodiment.
[0053] Finally, it should be noted that:
[0054] 1. This embodiment can be used to treat a single branch vessel lesion, and can also be used to treat multiple branch vessel lesions through structural deformation, for example, Figure 3 As indicated for the treatment of innominate branch vessel lesions, such as Figure 7 As indicated for the treatment of lesions of the innominate branch vessels and left common carotid artery branches, or, Fig. 9The structure shown is used to treat the simultaneous lesions of the innominate artery, the left common carotid artery and the left subclavian artery. The number of branch bare stents 2 is selected according to the number of branches involved in the vascular lesions, and the main bare stent 1 and the branch bare stent 2 are selectively coated according to the specific lesion location of the blood vessel. Figure 5 As shown, it is applied to the renal artery and the abdominal aorta, the branch bare stent 2 is implanted into the renal artery, the main bare stent 1 is located in the abdominal aorta, the diseased renal artery is propped open by the branch bare stent 2, and the main bare stent 1 and the branch bare stent 2 are selectively coated according to the specific lesion position of the blood vessel;
[0055] 2. The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the various embodiments of the utility model.
Claims
1. A multi-channel grid bracket, Features: The invention comprises a bare stent formed by interlacing and weaving superelastic metal or alloy monofilaments into an integral structure, the bare stent comprises a tubular main bare stent (1) and at least one tubular branch bare stent (2), and: one end of the branch bare stent (2) is separated from the circumferential direction between the two ends of the main bare stent (1).
2. The multi-channel lattice stent according to claim 1, Features: The density of the braided mesh at the connection portion between the main bare stent (1) and the branch bare stent (2) is smaller than the density of the braided mesh of the main bare stent (1).
3. The multi-channel lattice stent according to claim 1, Features: The branch bare stent (2) includes at least one.
4. The multi-channel lattice stent according to claim 3, Features: The branch bare stents (2) include at least two and are spaced apart from each other.
5. The multi-channel lattice stent according to claim 1, Features: The number of edges of the woven mesh unit at the connection portion between the main bare stent (1) and the branch bare stent (2) is greater than or equal to the number of edges of the woven mesh unit of the main bare stent (1), and the number of edges of the woven mesh unit at the connection portion between the main bare stent (1) and the branch bare stent (2) is greater than or equal to the number of edges of the woven mesh unit of the branch bare stent (2).
6. The multi-channel lattice stent according to claim 1, Features: The number of sides of the braided mesh unit of the main bare stent (1) is equal to the number of sides of the braided mesh unit of the branch bare stent (2).
7. The multi-channel lattice stent according to claim 1, Features: The circumferential surface of the main bare stent (1) is provided with a main covering film, and the main covering film covers the circumferential surface of the main bare stent (1) in whole or in part.
8. The multi-channel lattice stent according to claim 1, Features: The peripheral surface of the branch bare stent (2) is provided with a branch coating, and the branch coating covers the peripheral surface of the branch bare stent (2) in whole or in part.
9. A bracket assembly, It is characterized in that It comprises a main coated stent (3) and a multi-channel grid stent according to any one of claims 1 to 8, wherein the main coated stent (3) is cylindrical, and in the implanted state, the main bare stent (1) of the multi-channel grid stent is sleeved on the outside of the main coated stent (3).
10. A bracket assembly, It is characterized in that It comprises a main coated stent (3) and a multi-channel grid stent according to any one of claims 1 to 8, wherein the main coated stent (3) is cylindrical and has windows on its circumference. In the implanted state, the main bare stent (1) of the multi-channel grid stent is supported inside the main coated stent (3), and the branch bare stent (2) extends out of the main coated stent (3) from the windows.