Covered stent coated with electrostatic spinning membrane

Abstract

The covered stent comprises a metal stent and a covering film, the metal stent is composed of a spiral metal wire, the metal wire is provided with a plurality of zigzag portions which are evenly arranged and connected end to end, every two adjacent zigzag portions are in a wave crest shape and a wave trough shape respectively, the multiple zigzag portions enable the metal wire to be in a wave shape, and the covering film is arranged on the metal stent. The covering film covers the surface of the metal support to form a tubular structure, and the tubular structure can be kept shaped after bending deformation at the lesion position so that the tubular structure can be matched with the lesion position in shape. The covered stent disclosed by the utility model has a porous structure with high specific surface area and adjustable performance, the micron-sized aperture of the covered stent can effectively prevent blood permeation, the high porosity of the covered stent allows a proper amount of tissues or cells to penetrate, and vascularization and tissue integration of the implanted stent are promoted, so that the covered stent is helpful for reducing the risk of displacement or instability of the stent.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a film-coated stent covered with an electrospun film. Background Technology

[0002] Covered stents are medical devices used to treat vascular diseases such as aneurysms, vascular stenosis, or arterial dissection. They combine a metal stent with an artificial membrane covering it. The metal stent adheres to the inner wall of the blood vessel, providing support to the affected area, while the covering artificial membrane forms a physical barrier, effectively preventing blood leakage. It also provides the stent with good mechanical strength and toughness, reducing wear and stress concentration on the stent structure. For aneurysms, covered stents can prevent rupture, while for arterial stenosis, they help maintain unobstructed blood flow.

[0003] Existing covered stents typically use woven fabric to create the covering, which is then bonded to a metal stent through methods such as sewing, heat pressing, bonding, or heat fusion. Sewing is the most commonly used method. For example, the existing patent CN118490414A, which describes a covered stent and its release device, uses sewing to combine the metal stent and the covering. However, manual sewing is complex and it's difficult to ensure the uniformity of the covering, especially on curved or geometrically complex stents, where uneven coverage or loose sutures may occur. Furthermore, sutures can cause blood to clot in localized areas, forming thrombi. Therefore, existing technologies have certain limitations. Utility Model Content

[0004] This invention was developed to solve the above-mentioned problems, and its purpose is to provide a film-coated support for coating an electrospun film.

[0005] This invention provides a coated scaffold covered with an electrospun film, characterized by comprising: a metal scaffold and a coating; the metal scaffold being composed of a spiral metal wire having multiple evenly arranged and connected bends, with adjacent bends forming crests and troughs respectively; the multiple bends giving the metal wire a wavy shape; and the coating covering the surface of the metal scaffold to form a tubular structure.

[0006] Among them, the tubular structure can be bent and deformed at the lesion site and then remain in shape so as to adapt to the shape of the lesion site.

[0007] The coating support for electrospun film provided by this utility model can also have the following feature: the metal wire is made of any one of nickel-titanium alloy, cobalt-based alloy, or stainless steel.

[0008] The coating support provided by this utility model can also have the following feature: the coating is an electrospun fiber membrane.

[0009] The coated support provided by this utility model also has the following feature: the coating is applied to the surface of the metal support by electrospinning.

[0010] The coating support provided by this utility model, which is coated with an electrospun film, also has the following characteristics: the thickness of the coating is 10 to 100 μm and the pore size is 0.8 to 10 μm.

[0011] Functions and effects of utility models

[0012] According to this utility model, a covered stent with an electrospun membrane is characterized by a high specific surface area and a controllable porous structure. Its micron-sized pores effectively prevent blood permeation, while the high porosity allows for adequate tissue or cell penetration, promoting vascularization and tissue integration after implantation. This helps reduce the risk of stent displacement or instability. Furthermore, because the membrane is applied to the surface of the metal stent via electrospinning, it can adapt to complex stent shapes and achieve high-precision coverage, forming a uniform and dense membrane on the stent surface. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a film-coated support for electrospun film according to this utility model.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Metal support; 2. Coating. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following embodiments are described in detail with reference to the accompanying drawings.

[0017] Example

[0018] Figure 1 This is a schematic diagram of the structure of a film-coated support for electrospun film according to this utility model.

[0019] like Figure 1 As shown, this embodiment provides a film-coated support for electrospun film, including: a metal support 1 and a film 2.

[0020] like Figure 1 As shown, the metal support 1 is composed of a spiral metal wire with multiple evenly arranged and connected bends. The two adjacent bends are respectively shaped like crests and troughs, and the multiple bends make the metal wire wavy.

[0021] In this embodiment, the metal wire is preferably made of nickel-titanium alloy, cobalt-based alloy, or stainless steel.

[0022] like Figure 1 As shown, the membrane 2 covers the surface of the metal stent 1 to form a tubular structure. The tubular structure can be bent and deformed at the lesion site and then maintain its shape to adapt to the shape of the lesion site.

[0023] In this embodiment, the membrane 2 is preferably an electrospun fiber membrane made of TPU, PA6, or PTFE. Therefore, the membrane-covered stent of this invention has a high specific surface area and a controllable porous structure. Its micron-sized pores can effectively prevent blood permeation, and its high porosity allows a suitable amount of tissue or cells to penetrate, promoting vascularization and tissue integration of the stent after implantation. This helps to reduce the risk of stent displacement or instability.

[0024] In this embodiment, the coating 2 is preferably applied to the surface of the metal support 1 via an electrospinning process. Therefore, it can adapt to complex shapes of the support surface and achieve high-precision coverage according to the complex shape of the metal support 1, forming a uniform and dense coating 2 on the surface of the metal support 1.

[0025] In this embodiment, the thickness of the coating 2 is preferably 10-100 μm, and the pore size is preferably 0.8-10 μm.

[0026] The role and effect of the embodiments

[0027] According to this utility model, a covered stent with an electrospun membrane is characterized by a high specific surface area and a controllable porous structure. Its micron-sized pores effectively prevent blood permeation, while the high porosity allows for adequate tissue or cell penetration, promoting vascularization and tissue integration after implantation. This helps reduce the risk of stent displacement or instability. Furthermore, because the membrane is applied to the surface of the metal stent via electrospinning, it can adapt to complex stent shapes and achieve high-precision coverage, forming a uniform and dense membrane on the stent surface.

[0028] The above embodiments are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model.

Claims

1. A coated scaffold covered with an electrospun film, characterized in that, include: The metal support consists of a spiral metal wire with multiple evenly arranged, interconnected bends. Adjacent bends form crests and troughs, respectively, giving the metal wire a wavy shape. The coating covers the surface of the metal support to form a tubular structure. The tubular structure can be bent and deformed at the lesion site and then kept in shape so as to adapt to the shape of the lesion site.

2. The coated support structure with an electrospun film as described in claim 1, characterized in that: in, The metal wire is made of nickel-titanium alloy, cobalt-based alloy, or stainless steel.

3. The film-coated support structure with an electrospun film as described in claim 1, characterized in that: in, The coating is an electrospun fiber membrane.

4. The coated support structure with an electrospun film as described in claim 1, characterized in that: in, The coating is applied to the surface of the metal support using an electrospinning process.

5. The coated support structure with an electrospun film as described in claim 1, characterized in that: in, The coating has a thickness of 10–100 μm and a pore size of 0.8–10 μm.

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