A coated stent

Abstract

The utility model discloses a coated stent, which relates to the technical field of medical devices, including a stent body, an outer membrane and an inner membrane. The stent body includes a plurality of segmented stents connected in sequence, and the segmented stents are connected by a connecting portion; the outer membrane is sleeved on the stent body, and the two ends of the outer membrane are respectively fixedly connected to the segmented stents at the two ends of the stent body, and a movable gap is formed between the middle of the outer membrane and the segmented stents in the middle of the stent body; the inner membrane is a coating formed by applying a silicone solution on the inner wall of the segmented stent, and rotating the segmented stent so that the silicone solution is evenly attached to the inner wall of the segmented stent, and then vulcanizing and drying. The utility model improves the compliance of the coated stent through a segmented structure. At the same time, through the coating method of coating, the inner membrane can fit the inner wall of the stent body, and the thickness of the inner membrane is relatively uniform, so that the channel of the coated stent has good smoothness and is not easy to accumulate impurities.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a stent graft. Background Art

[0002] A covered stent is a medical stent made of metal wire and covered with membrane material. It is implanted in the human body to expand narrow or obstructed cavities in the body and keep the cavities open.

[0003] There are three common types of stent grafts on the market: Figure 1-Figure 3 As shown, these three types of coated stents are all one-piece structures. Since the metal mesh stent is coated as a whole, the middle section of the stent is constrained by the film tube, which reduces the compliance and bendability, resulting in the stent being unable to fit the surrounding human tissue and prone to displacement.

[0004] In order to solve the problem of poor compliance of the stent, a segmented stent has emerged in the prior art, such as the Chinese patent document with announcement number CN104367399B, which discloses a super-compliant recyclable coated segmented stent, including a stent cup portion at both ends and a stent body composed of two or more segmented parts connecting the stent cup portions at both ends, the inner diameter of the cup portion is larger than the inner diameter of the segmented part, and an independent outer layer of the stent body is embedded with a mutual movable gap between the segmented parts; the segmented parts are connected by silk threads; and the two or more segmented parts of the stent body are immersed in liquid polymer material to form a coating.

[0005] Although the above scheme connects the membrane parts at both ends to the metal stent so that the metal stent in the middle part and the membrane tube can move relatively, and the membrane tube can still fit the human body during the free bending of the metal stent, thereby improving the compliance of the stent, however, since the coating method of the metal stent in the above scheme is immersion, the film formed by immersion has a poor fit with the inner surface of the metal stent, which reduces the smoothness of the channel of the coated stent, and impurities are easily attached to the inner wall of the coated stent, causing the accumulation of impurities in the channel of the coated stent, hindering the flow of liquid in the human cavity, and the coated stent loses its function. Utility Model Content

[0006] The purpose of the utility model is to provide a coated stent to solve the problems existing in the above-mentioned prior art. Through the segmented structure, the compliance of the coated stent is improved. At the same time, through the coating method of smearing, the inner membrane can fit the inner wall of the stent body, and the thickness of the inner membrane is relatively uniform, so that the channel of the coated stent has good smoothness and is not easy to accumulate impurities, thereby ensuring that the liquid in the human body cavity flows smoothly in the channel of the coated stent.

[0007] To achieve the above purpose, the utility model provides the following solutions:

[0008] The utility model provides a coated stent, comprising a stent body, an outer membrane and an inner membrane, the stent body comprising a plurality of segmented stents connected in sequence, the segmented stents being connected by a connecting portion; the outer membrane is sleeved on the stent body, the two ends of the outer membrane are respectively fixedly connected to the segmented stents at the two ends of the stent body, and a movable gap is formed between the middle part of the outer membrane and the segmented stents in the middle part of the stent body; the inner membrane is a coating formed by applying a silicone solution on the inner wall of the segmented stent, and by rotating the segmented stent so that the silicone solution is evenly attached to the inner wall of the segmented stent, and then vulcanizing and drying.

[0009] Preferably, the connecting portion is a connecting structure formed by two connecting lines cross-connected.

[0010] Preferably, the connecting portion is a connecting structure formed by a plurality of connecting lines being aligned and hooked together.

[0011] Preferably, the segmented stent is a mesh stent structure woven from nickel-titanium wires; and the connecting wire is nickel-titanium wire.

[0012] Preferably, the outer membrane is a silicone membrane sleeve.

[0013] Preferably, two ends of the outer membrane are respectively connected to the segmented stents at two ends of the stent body by heat melting.

[0014] Preferably, the coated stent also includes a recovery line, and the recovery line is arranged at the end of the stent body.

[0015] Preferably, the recovery line is nylon thread.

[0016] Preferably, the coated support further includes a developing ring, and the developing ring is arranged at the end of the support body.

[0017] Preferably, the developing ring is a platinum-iridium alloy ring.

[0018] Compared with the prior art, the utility model has achieved the following technical effects:

[0019] The coated stent provided by the utility model includes a stent body, an outer membrane and an inner membrane. The stent body includes a plurality of segmented stents connected in sequence. The segmented structure improves the compliance of the coated stent. At the same time, the inner membrane is a coating formed by applying a silicone solution on the inner wall of the segmented stent, and rotating the segmented stent so that the silicone solution is evenly attached to the inner wall of the segmented stent, and vulcanizing and drying. The coating method of applying allows the inner membrane to fit the inner wall of the stent body, and the thickness of the inner membrane is relatively uniform, so that the channel of the coated stent has good smoothness and is not easy to accumulate impurities, thereby ensuring that the liquid in the human body cavity flows smoothly in the channel of the coated stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is the first type of covered stent commonly found on the market;

[0022] Figure 2 It is the second most common type of covered stent on the market;

[0023] Figure 3 It is the third most common type of covered stent currently on the market;

[0024] Figure 4 A schematic diagram of a stent graft provided in Embodiment 1 of the present utility model;

[0025] Figure 5 A schematic diagram of a stent graft provided in Example 2 of the utility model;

[0026] Figure 6 A schematic diagram of a tooling for processing the coated stent provided in Example 1 of the utility model.

[0027] In the figure: 01-tooling, 02-rotating heating mechanism, 1-bracket body, 2-outer membrane, 3-inner membrane, 4-connecting line, 5-recovery line, 6-developing ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The purpose of the utility model is to provide a coated stent to solve the problems existing in the prior art. Through the segmented structure, the compliance of the coated stent is improved. At the same time, through the coating method of smearing, the inner membrane can fit the inner wall of the stent body, and the thickness of the inner membrane is relatively uniform, so that the channel of the coated stent has good smoothness and is not easy to accumulate impurities, thereby ensuring that the liquid in the human body cavity flows smoothly in the channel of the coated stent.

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Embodiment 1

[0032] like Figure 4 As shown, the present embodiment provides a coated stent, comprising a stent body 1, an outer membrane 2 and an inner membrane 3, wherein the stent body 1 comprises a plurality of segmented stents connected in sequence, and the segmented stents are connected by a connecting portion; specifically, in the present embodiment, the segmented stent is a mesh stent structure woven by nickel-titanium wires, wherein the outer diameters of the segmented stents at both ends of the stent body 1 are greater than the outer diameters of the segmented stents in the middle of the stent body 1, and the connecting portion is a connecting structure formed by two connecting wires 4 cross-hooked, with high connection strength, and the connecting wires 4 are preferably nickel-titanium wires; the outer membrane 2 is sleeved on the stent body 1, and the outer membrane 2 is preferably a silicone membrane sleeve, and the two ends of the outer membrane 2 are respectively hot-melt-connected to the segmented stents at both ends of the stent body 1 The inner membrane 3 is connected to the inner wall of the segmented stent by coating the silicone solution, and the segmented stent is rotated to make the silicone solution evenly adhere to the inner wall of the segmented stent, and is formed by vulcanization and drying, which is used to prevent the coated stent from growing together with human tissue, so as to facilitate recovery. In addition, through the coating method, the inner membrane 3 can fit the inner wall of the stent body 1, and the thickness of the inner membrane 3 is relatively uniform, so that the channel of the coated stent has good smoothness and is not easy to accumulate impurities, thereby ensuring that the liquid in the human cavity flows smoothly in the channel of the coated stent.

[0033] In this embodiment, the stent graft further includes a recovery line 5, which is preferably a nylon thread. The recovery line 5 is disposed at the end of the stent body 1 for subsequent recovery of the stent graft.

[0034] In this embodiment, the coated stent also includes a developing ring 6, which is arranged at the end of the stent body 1; specifically, the developing ring 6 in this embodiment is preferably a platinum-iridium alloy ring, and two developing rings 6 are provided. The two developing rings 6 are respectively arranged on the segmented stents at both ends of the stent body 1, and are used for the developing function during surgery.

[0035] The preparation method of the stent graft provided in this embodiment is as follows:

[0036] Step 1: braiding and heat treating the nickel-titanium wire to form each segmented stent; Step 2: applying the silica gel solution to the inner wall of each segmented stent, and then placing each segmented stent on tooling 01 (such as Figure 6In the rotating heating mechanism 02 shown in the figure, by rotating each segmented bracket, the silicone solution is evenly attached to the inner wall of each segmented bracket, and then high-temperature vulcanization is performed. This step can make the coating on the inner surface of the bracket body 1 more uniform, and there will be no uneven thickness of the inner film 3; step three, use the connecting line 4 to connect the segmented brackets to form the bracket body 1; step four, put the outer film 2 (that is, an independent silicone film sleeve) on the bracket body 1, and hot-melt the two ends of the outer film 2 to the segmented brackets at both ends of the bracket body 1; step five, install the recovery line 5 and the developing ring 6.

[0037] Embodiment 2

[0038] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that the connection portion is a connection structure formed by aligning and hooking a plurality of connection wires 4, which also has the advantage of high connection strength.

[0039] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A stent graft, characterized in that: It includes a stent body, an outer membrane and an inner membrane, wherein the stent body includes a plurality of segmented stents connected in sequence, and the segmented stents are connected by a connecting portion; the outer membrane is sleeved on the stent body, and the two ends of the outer membrane are respectively fixedly connected to the segmented stents at the two ends of the stent body, and a movable gap is formed between the middle part of the outer membrane and the segmented stents in the middle part of the stent body; the inner membrane is a coating formed by applying a silicone solution on the inner wall of the segmented stent, and rotating the segmented stent so that the silicone solution is evenly attached to the inner wall of the segmented stent, and then vulcanizing and drying.

2. The stent graft according to claim 1, characterized in that: The connecting portion is a connecting structure formed by two connecting lines cross-connected.

3. The stent graft according to claim 1, characterized in that: The connecting portion is a connecting structure formed by aligning and hooking a plurality of connecting lines.

4. The stent graft according to claim 2 or 3, characterized in that: The segmented stent is a mesh stent structure formed by weaving nickel-titanium wires; the connecting wire is nickel-titanium wire.

5. The stent graft according to claim 1, characterized in that: The outer membrane is a silicone membrane sleeve.

6. The stent graft according to claim 5, characterized in that: The two ends of the outer membrane are respectively connected to the segmented stents at the two ends of the stent body by heat melting.

7. The stent graft according to claim 1, characterized in that: The coated stent also includes a recovery line, which is arranged at the end of the stent body.

8. The stent graft according to claim 7, characterized in that: The recovery line is a nylon thread.

9. The stent graft according to claim 1, characterized in that: The film-covered support also includes a developing ring, which is arranged at the end of the support body.

10. The stent graft according to claim 9, characterized in that: The developing ring is a platinum-iridium alloy ring.

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